CN104221397B - Impulse attenuation based on earphone noise - Google Patents

Abstract

A kind of earphone with current microphone of talking, including voicefrequency circuit, the voicefrequency circuit is detected more than predetermined voltage level (just and/or negative voltage level in response to voicefrequency circuit, may have predetermined voltage amplitude from zero voltage level) and when there is such case peak value in the signal of the voltage level change rate with more than voltage level predetermined variation rate (just and/or negative) beginning, and the signal for the sound that compression expression is detected by current microphone of talking, compression degree can be compressed to or close to zero amplitude (may arrive or close to zero voltage level), the duration of compression can be controlled by timing circuit and be set to the retriggerable predetermined amount of time in predetermined amount of time.

Description

Impulse attenuation based on earphone noise

The cross reference of related application

The application is the Application U.S. Serial No 13/336207 that Paul G.Yamkovoy proposed on December 23rd, 2011 Part continue, the disclosure of which is integrally incorporated by quoting with it herein.

Technical field

The present invention relates to detection by earphone the current microphone detection of talk quick startup environmental noise appearance so as to Temporarily weaken current audio of talking.

Background technology

With for being reduced to the ability for reaching user's ear and user may being hindered to use one or more earphone characteristics The noise of the more effective form of the environmental noise of (that is, listen music, carry out two-way communication etc.) reduces the appearance of earphone, really Recognize the ear that the voice for needing to allow another person near user to some extent still reaches user, so as to allow user with Other side has conversation, at least a portion without lifting down earphone from least one ear of user.This causes " to talk logical OK " (TT) function increases to such earphone, its using one or more filtering techniques separate so-called another person voice and Other ambient sounds and no matter whether such earphone provides passive Noise and reduce (PNR) or active noise reduces (ANR) work( Energy can be by the ear of those voice deliveries to user.Unfortunately, while provide by with the relatively rapid startup time The false triggering of audio compressor caused by a certain relatively loud ambient sound (that is, bombarding sound, explosive sound etc.) or from such as Produce the electrostatic discharge event for the pulse for being similar to the so relatively loud ambient sound also with the relatively rapid startup time ANR the and TT functions of electrical noise have difficulties.

The content of the invention

Earphone with current microphone of talking includes voicefrequency circuit, exceedes predetermined voltage electricity in response to voicefrequency circuit detection It is flat (just and/or negative voltage level, it may be possible to from the predetermined voltage size of zero voltage level) signal peak value (just and/or It is negative) start and the voltage level change rate of the predetermined variation rate with more than voltage level during such case occur, it is described The signal for the sound that voicefrequency circuit compression expression is detected by current microphone of talking, compression degree can be compressed to or approach Zero amplitude (may be close to zero voltage level), and the duration of compression can be controlled by the timing circuit for being set to predetermined amount of time, And it can trigger again within a predetermined period of time.

In an aspect, the sound acoustically exported by the acoustic driver being arranged in the housing of earphone earplug is controlled Method include：Compression expression is in response to detecting more than predetermined voltage level and becoming with the voltage level more than predetermined variation rate The peak value breaking-out of the signal of rate, the letter of the sound of the microphone detection of the earphone of the environment by being acoustically coupled to hull outside Number.

In another aspect, earphone includes including the first of the first housing and the first acoustic driver being arranged therein Earplug；By communication headset structural bearing and be acoustically coupled to the first microphone of the environment of the first hull outside；And coupling To the first acoustic driver and the voicefrequency circuit of the first microphone, the voicefrequency circuit receives the sound for representing to be detected by the first microphone The signal of sound and provide output to the first acoustic driver.Voicefrequency circuit response detection is more than predetermined voltage level and has More than the signal peak of the voltage level change rate of predetermined variation rate breaking-out and compressed signal.

Brief description of the drawings

Fig. 1 a and Fig. 1 b are the perspective views of earphone.

Fig. 2 a and Fig. 2 b are the block diagrams of the part of the possibility electronic architecture of Fig. 1 a earphone.

Fig. 3 is the block diagram of the part of the variant of the electronic architecture for Fig. 2 a and Fig. 2 b for including ANR.

Fig. 4 a and Fig. 4 b are the block diagrams of the part of the possibility electronic architecture of Fig. 1 b earphone.

Embodiment

It is disclosed herein and be required of in order to suitable for broad category of earphone, i.e. can be worn over user's head or its The device of surrounding, wherein at least one acoustic driver are positioned near ear；Suitable for broad category of communication headset, i.e. In addition so forming causes microphone to be located towards user's mouth and thus allow for bidirectional audio communication.It should be noted that Although the tool for including the earphone of a pair of acoustic drivers (each driver is used for the ear of user) is suitably proposed in detail Body embodiment, but it is to promote to understand by example that specific embodiment, which is so presented, is not to be construed as the limitation present invention's Protection domain or the protection domain of claim covering.

It is disclosed herein and be required of in order to suitable for also provide active noise reduce (ANR), passive Noise reduce (PNR) or both combination earphone.It is disclosed herein and be required of to be adapted for couple to the ear of various audio devices Machine, include but is not limited to, talkback system (ICS), radio, digital audio-frequency player；With by wiredly and/or wirelessly connecting Connect.It is disclosed herein and be required of in order to suitable for physics near one or two ear of user can be worn over forming The earphone of configuration, include but is not limited to, headphone, behind-the-ear earphone including at least one earplug and be physically discrete from ground It is worn over the two-piece type earphone of neck or the microphone around it and cap or the helmet including earplug and/or microphone.Ability Domain ordinarily skilled artisan will understand that suitable for it is disclosed herein and require earphone other embodiment.

Fig. 1 a and Fig. 1 b describe the earphone 1000a and 1000b that to be coupled to audio devices embodiment, such as ICS, radio reception Machine, tape player, digital audio-frequency player etc..Earphone 1000a is the communication headset for bidirectional audio communication, including head Component 100, upper cable 200, control box 300 and subjacent cable 400.Earphone 1000b is primarily used for listening the simpler of audio Earphone, include the earphone 100 and subjacent cable 400 of more simple form.

Both earphone 1000a and 1000b head assembly 1000 include each having one in a pair of acoustic drivers 115 Individual a pair of earplugs 110, coupling earplug 110 to headband 112 together and current microphone 185 of talking for a pair.Earphone 1000a Head assembly further comprise a pair of feedforward ANR microphones 195, the and of microphone arm support 122 extended from earplug 110 Supported by microphone arm support 122 and the microphone casing body 120 of communication microphone 125 is eliminated including noise.Further comprise extremely In the housing of a few earplug 110 and/or another part of head assembly 100 be electrically coupled to acoustic driver 115 (and/ Or be coupled to the communication microphone 125 in earphone 1000a) voicefrequency circuit 600.As above described, earphone 1000a-b has " wear-type " physical arrangement.However, although describing the specific physical arrangement, but one of ordinary skill in the art will easily recognize Know, head assembly 100 can use other various forms of physical arrangements, including only have an earplug 110 (therefore, only Have an acoustic driver 115) physical arrangement, using the earplug extended between the earplug 110 around user's neck rear The physical arrangement of 110 neckstrap, and/or the physical arrangement not with belt.Depending on earplug 110 is relative to human ear auricle Physical size size, each earplug 110 can be " on ear " (also commonly referred to as " ear-sticking ") or " around ear " (generally also Referred to as " ring ear formula ") form earphone.

Earphone 1000a control box 300 includes the housing 330 containing control circuit 700.Control box 300 can also include One or more manually operated controllers 335, can be such that earphone 1000a user manually controls and be performed by earphone 1000a Each function aspect.Control box may further include the cabin (not shown) for the battery 345 for being coupled to control circuit 700 And/or battery 345 itself.In contrast, on earphone 1000b, control circuit 700, controller 335 and/or battery 345 are (such as Fruit presence) it is included in the one or both of housing 110.

Earphone 1000a upper cable 200 substantially by headset assembly 100 an earplug 110 and control box 300 it Between extend and couple multi-core power cable composition.When doing so, at least one subset of the wire of upper cable 200 is on head Coupled between the voicefrequency circuit 600 of component 100 and the control circuit 700 of control box 300 and transmit electric signal.In earphone 1000a Various possible variants in, upper cable 200 can be formed as coiled shape, to be user-friendly earphone 1000a.Moreover, Upper cable 200 can be additionally comprise one or more connector (not shown) in upper cable 200, at connector Upper cable 200 is coupled to an earplug 110 and/or upper cable 200 is coupled to the housing 330 of control box 300, so that Upper cable 200 can disassemble from the one or both in head assembly 100 and control box 300.In contrast, it is assumed that sound Both frequency circuit 600 and voicefrequency circuit 700, which are included in the part of head assembly 100, causes earphone 1000b not include control box 300, then earphone 1000b also do not include upper cable 200.

Subjacent cable 400 from the control box 300 on earphone 1000a substantially by extending and/or from earphone 1000b Another multiconductor cable that one earplug 100 extends is formed.On earphone 1000a, subjacent cable 400 can be from control box 300 disassemble (by one or more connectors 480), and its different variants (is just being described with one or more connectors 490 Two variants) terminate, so that earphone 1000a can be removably coupled to a variety of audio devices.On earphone 1000b, under The single variant of portion's cable 400 can more permanently be coupled to an earplug 110.The wire of subjacent cable 400 it is at least one Subset couples between the circuit for any audio devices that control circuit 700 and connector 490 can be coupled to and transmits telecommunications Number.In various possible variants, subjacent cable 400 can be formed as coiled shape, in order to which user uses earphone 1000.

As more specifically described in Fig. 1 a, earphone 1000a can be coupled to more than one audio devices, may include making it Wireless device 980 can be coupled to by wireless signal 985 (that is, infrared signal, radiofrequency signal etc.), and (that is, mobile phone, audio are returned Put/tape deck, two-way radio etc.) wireless transceiver, it is thus possible to earphone 1000a user is extraly passed through earphone 1000 interact with wireless device 980.Alternatively or additionally, earphone 1000a can include satellite interface (that is, for extremely Few some form of connector for receiving the analog or digital signal for representing audio), earphone 1000a is passed through some forms Light conduction or conductive cable 995 be coupled to non-wireless means 990 (that is, audio playback, entertainment broadcast etc.), allow users to The audio provided by non-wireless means 990 is provided at least through earphone 1000a.Include manually operated controller in control box 300 In the case of 335, manually operated controller 335 can make earphone 1000a user coordinate earphone 1000, wireless device 980, The audio transmission that non-wireless means 990 and earphone 1000a can pass through between any audio devices that subjacent cable 400 is coupled to. In contrast, it is that optional variant with such performance, but with such performance is certain that earphone 1000b is not specifically depicted It is possible.

Fig. 2 describes the possibility embodiment for the electronic architecture 2000a that earphone 1000a can be used.In order to promote to understand, earphone 1000a, which is portrayed as, is coupled to audio devices 9000, and in this example, audio devices are the communication dresses for being capable of two way audio transmission Put, such as the vehicle-mounted radio of ICS or aircraft, military vehicle etc..Only describe to promote to discuss required audio to fill Put 9000 part.As Fig. 1 a, Fig. 2 a describe the coupling that head assembly 100 arrives control box 300 by upper cable 200, And describe the coupling that control box 300 arrives audio devices 9000 by subjacent cable 400.Fig. 2 a are further depicted as each cable 200 With 400 individual conductor.

It should be noted again that voicefrequency circuit 600 can be existed entirely in the housing of only one earplug 110；Or Some can be divided into, is each partly distributed in the housing of each earplug 110 (in the earphone with a pair of earplugs 110 In 1000 variant), in the housing 120 with communication microphone 125, and/or other positions in earphone 1000a structure Put.Therefore, although using single block delineations voicefrequency circuit 600 in order to discuss, this is not to be construed as meaning own Voicefrequency circuit 600 there must be in the single position of earphone 1000a structure.

As described above, in electronic architecture 2000a, left audio and right audio signal and the subsidiary public affairs for being used as signal and returning System earth altogether is existed by the part of the wire in head assembly 100, the wire of cable 200 and 400 and circuit 600 and 700 Extend between audio devices 9000 and corresponding acoustic driver 115.Individually left audio and right audio signal are provided Ear of the stereo audio to earphone 1000a user can be provided.As also described, microphone high pitched signal and microphone are low Sound signal exists again by the part of the wire in head assembly 100, the wire of cable 200 and 400 and circuit 600 and 700 Extend between audio devices 9000 and communication microphone 125.

One of ordinary skill in the art will be familiar with, and the extensive industrial practice and/or government regulation of specific industry are often referred to Surely the audio devices of the concrete form of bidirectional audio communication (that is, the radio or ICS that are represented by audio devices 9000) are supported to exist Microphone bias voltage is provided between the associated wire of the audio devices of such form with coupling ear microphone, so as to fit In requisition for the certain form of microphone of bias voltage.One of ordinary skill in the art will be familiar with, it is considered to be best practices , maintain wire to couple ear microphone to ICS or radio (that is, wire microphone bass and the microphone height described Sound) for be totally independent of coupling headphone acoustic driver and ICS or radio (that is, the left audio of wire described, right audio and System earth) wire.As a part for such best practices, associated and related with acoustic driver to microphone Any coupling of any earth lead between the wire of connection is only present in ICS or the radio (void such as in audio devices 9000 What line drawing was painted) in, to attempt to avoid to produce along what such cable coupling earphone and the length of ICS or radio extended to connect Earth-return.

Further, with it is less consistent in specific industry, support the various forms of audios of bidirectional audio communication to fill Put can with or without coupling audio device and earphone (that is, communicator power line as depicted) at least one other leading Line provides electrical power to earphone.In the case of power as offer, generally say be what earth lead and earphone acoustics Driver is associated (that is, system earth wire), rather than associated with the microphone of the earphone wire.Such as previous institute Describe and discuss, subjacent cable 400 can disassemble from control box 300, so as to allow using different editions bottom electricity There is various sizes of connector 490 to adapt to various forms of communicators (that is, audio of different editions for cable 400, subjacent cable Device 9000).One of ordinary skill in the art will be familiar with, the connector that audio devices 9000 can provide can with or do not support Electrical power is provided to earphone, this can be one of difference of subjacent cable 400 for adapting to different editions.

Therefore, as depicted, from audio devices 9000 (the communicator power line for passing through subjacent cable 400) and battery 345 one or both supplies power to control circuit 700.Consistent with other best practices, the earth lead of battery 345 is usual It is additionally coupled to system earth.Similarly, no matter at least one head assembly power line of upper cable 200 will provide from which kind of source Power to control circuit 700 is transferred to voicefrequency circuit 600.Earphone 1000a can use the electrical power to perform various functions, bag Include but be not limited to, amplify the audio exported by acoustic driver 115, amplify the audio detected by communication microphone 125 in advance, carry ANR (dotted line that therefore, ANR microphones 195 couple with the possibility of voicefrequency circuit 600 describe) for one or more forms, to Wireless transceiver is powered to send and/or receive audio (that is, the wireless transceiver for forming communication link 985), in acoustics The acoustics of driver 115 export and/or the audio that is detected by communication microphone 125 on perform various forms of signal transactings, and/or Current (TT) function of talking is provided, so as to by the available any passive Noises of earphone 1000a reduce (PNR) and/or ANR optionally transmits the voice of the environment outside housing 110, (therefore, talks and leads in order to which it reaches the ear of user The dotted line that row microphone 185 couples with the possibility of voicefrequency circuit 600 is described).

Such as one of ordinary skill in the art, it will readily recognize that, government regulation usually requires that the ear for supporting bidirectional audio communication Designed in machine using a certain degree of " fail safe " so that perform two-way communication and (that is, appoint using with what it may be coupled to What ICS or radio earphone) basic function will not be lost because of the loss of earphone power.Therefore, acoustic driver 115 Still have to can be used for two-way communication with communication microphone 125, even if audio devices 9000, battery 345 or any other source do not carry For power.Therefore, when power attenuation as appearance, common practice is to provide a kind of mechanism, by the mechanism in acoustics The signal used in the basic operation of driver 115 and communication microphone 125 will bypass any amplification or other circuits (that is, exist Transmitted between connector 490, acoustic driver 115 and communication microphone 125 without interruption).

The control circuit 700 that is also positioned at least partially in control box 300 is loaded with and is coupled to using control box 300 Manual exercisable controller 335, the letter for controlling the audio-frequency function performed by voicefrequency circuit 600 is provided in earphone 1000a Number, it is transferred to head assembly 100 from control box 300 by upper cable 200.Performing the process of one or more functions Middle signalling allows voicefrequency circuit 600 to do, and what can by it, operable controller 335 be determined and/or can led to manually by user Cross and determined in response to available electrical power in a manner of more automating.In a possible method, electrical power is by upper cable 400 at least one head assembly power line is transferred to voicefrequency circuit 600, and with the voltage level selectively changed as control Make the mechanism of the one or more aspects of one or more performances of these each functions.In this way, control signal can be with Voicefrequency circuit 600 is transferred to from control circuit 700, the different pilots of upper cable 400 are increased to without using, Need not use undesirable complicated encoder and decoder circuit may be increased to control circuit 700 and voicefrequency circuit 600 Data serial signaling system.The number of conductors for the antenna for receiving EMI is intended as by reducing, by avoiding the occurrence of a lot Voltage level and/or the conversion with the sense of current using data serial signal, avoid increasing different control signal wires The approach for introducing electromagnetic interference (EMI) can be reduced with data serial signal.Further, transmitting power and transmitting control signal Also reduced in dual role using power line because it is used as introducing EMI caused by the inherent trend of AC coupling shorts over the ground Approach.

Fig. 2 b describe the voicefrequency circuit in the electronic architecture 2000a of Fig. 2 a for implementing talk current function in more detail A part for 600 possible embodiment.Therefore, for simplicity, being closed with other features for framework 2000a is had been left out It is closer part.Still for simplicity, the portion of the voicefrequency circuit 600 associated with an only earplug 110 is described Part, but be not a pair of earplugs 110.Therefore, although what is described can include a pair of (therefore, at least one pair of acoustics of earplug 110 The repetition subset of associated part in driver 115 and voicefrequency circuit 600) earphone 1000a forms a part, but in order to Unnecessary visual confusion is avoided, the part associated with its of an acoustic driver 115 in a description voicefrequency circuit 600.

As depicted, the voicefrequency circuit 600 in electronic architecture 2000a variant includes being coupled to acoustic driver 115 talk pass circuit 685, the pulse attenuator 680 for being coupled to talk current microphone 185 and talk pass circuit 685, For the differentiating amplifier 625 and coupling of the electric signal for tapping the audio for representing to be detected in its input by communication microphone 125 Close the output of differentiating amplifier 625 and the envelope detector 626 of talk pass circuit 685.And then talk pass circuit 685 It is portrayed as the controllable attenuator 686 of the output including being coupled to and receiving pulse attenuator 680, is coupled to controllable attenuator 686 Output voltage controlled avalanche oscillator 687, by its input coupling to the output of voltage controlled avalanche oscillator 687 and pass through its output It is coupled to the audio-frequency amplifier 688 of acoustic driver 115 and is additionally coupled to the output of audio-frequency amplifier 688 and be coupled to can Control the envelope detector 689 of the control input of attenuator 686.Pulse attenuator 680 is portrayed as including being arrived by its input coupling Talk the amplifier of microphone 684, defeated at its by high-pass filter (being made up of capacitor and resistor) of current microphone 185 Enter to be coupled to the output of amplifier of microphone 684 and the comparator 683 of reference voltage source, in its input coupling to comparator 683 Output and can trigger monostable multivibrator 682 and defeated by controlling again in the grid of its output coupling to MOSFET Enter to be coupled to MOSFET analog switch 681, controllable attenuator 686 passes through analog switch selectivity under MOSFET control It is coupled to the current microphone 185 of talk in ground.

Additionally, it should be noted that for the single acoustics visually for purpose of brevity, being only depicted in voicefrequency circuit 600 The circuit associated with its of driver 115 (that is, talk pass circuit 685 and pulse attenuator 680).Therefore, with a pair In the earphone 1000a of earplug 110 embodiment, there will be a pair of acoustic drivers 115, each acoustic driver, which has, is coupled to it On a pair of talk pass circuits 685 in a talk pass circuit being associated, single envelope detector 626 will be coupled into often Individual talk pass circuit 685.Further, this passes through a pair of impulse attenuations to can each have in talk pass circuit 685 The current Mike of associated talk for a pair of current microphones 185 of talking that the associated pulse attenuator of device 680 is coupled to thereon Wind.Alternatively, the individual pulse attenuator 680 associated with single current microphone 185 of talking may be coupled to a pair of talks Two in current device 685 current devices 685 of talking.

It should be noted that different from communication microphone 125, current microphone 185 of talking is not noise cancelling microphone, The difference for the function that this reflection is executed by it.Advantageously and preferably, communication microphone 125 is the Mike that noise eliminates type Wind so that it is the near field microphone of the voice of the mouth of user of the detection from the earphone 1000a near field, while tends to neglect Slightly far field sound.In contrast, advantageously and preferably, current microphone 185 of talking is not that such noise eliminates type Microphone so that it can detect far field sound (that is, from other people voice in addition to user) and near field sounds.

The people of talk current function is familiar with it will be recognized that talk pass circuit 685 works, and will be derived from except earphone The voice delivery of people outside 1000a user is to acoustic driver 115, and such as at least one current microphone 185 of talking is (by ear What machine 1000a was carried by being acoustically coupled to the part of external environment condition, talk pass circuit 685 passes through between pulse attenuator 680 Connect and be coupled to thereon) detected, so as to allow user to hear those voices, no matter earphone 1000a provide any PNR and/or ANR, otherwise generally user is prevented to hear those voices.In order to avoid by such PNR and/or ANR passed out voice it Outer sound, what 685 current microphones 185 of transmission talk of talk pass circuit detected makes a reservation in associated with people's voice Sound in audio frequency range.Although there can be following modifications of talk pass circuit 685：It includes distinguishing bandpass filter (not shown), sound and the sound outside such scope in such scope that the wave filter will transmit separate (so as to They are not passed), but so use the variant of the talk pass circuit 685 of the finite bandwidth variant of audio-frequency amplifier 688 It is also possible so that audio-frequency amplifier 688 performs band-pass filtering function in addition to amplification.

In talk pass circuit 685, envelope detector 689 and the cooperation of controllable attenuator 686 form audio compressor One may implement, and it monitors the output size of audio-frequency amplifier 688, and plays response and detect and be supplied to acoustic driver Audio-frequency amplifier 688 is reduced at the time of the output amplitude of 115 audio-frequency amplifier 688 exceedes predetermined threshold from current wheat of talking The effect for the audio signal amplitude that gram wind 185 receives.Therefore, it is closed loop compressor reducer by compressor reducer caused by the cooperation.Should It is noted that the input wherein in the absence of the audio compressor and audio-frequency amplifier 688 is more directly coupled to current wheat of talking The current electricity of talk of gram wind 185 (that is, may only have voltage controlled avalanche oscillator 687 and/or pulse attenuator 680 in-between) The alternate embodiments on road 685 are also possible, it is noted that wherein such compression is by a completely different way The alternate embodiments that the compressor reducer of implementation provides the talk pass circuit 685 of (that is, open loop compressor reducer) are also possible.So And it is expected to provide such audio compression function (that is, its any mode that can implement) conduct in talk pass circuit 685 Security feature, so as to by preventing to transmit excessive ambient sound arrival user's ear by talk pass circuit 685 to protect ear The hearing of machine 1000a user.

Controllable attenuator 686 (is passed through with providing to current microphone 185 of talking by capacitor, resistor and MOSFET The analog switch 681 of pulse attenuator 680) and the mode of AC couplings of both adjustable votage dividers combine what is formed, this area The adjustable votage divider well-known to the ordinarily skilled artisan.The MOSFET of controllable attenuator 686 grid input coupling is to envelope detector 689 output, so that envelope detector 689 can operate MOSFET, to control MOSFET to make from current microphone of talking The decay that 185 signal is subjected to.

Envelope detector 689 is ripe with the those of ordinary skill in audio compression field by diode, resistor and capacitor The mode known is coupled together to be formed.The anode of diode is coupled to the output of audio-frequency amplifier 688, and its negative electrode is coupled to first Resistor.And then first resistor is further coupled to capacitor and second resistor device (all further coupling of two resistors Splice grafting), and it is coupled to the MOSFET of controllable attenuator 686 grid input.Diode can be such that electric current amplifies from audio The output of device 688 by first resistor device (first resistor device control charge rate) to capacitor charging by way of flow, but It is not allow then by the output depletion of charge of audio-frequency amplifier 688.On the contrary, second resistance device provides controlled consumption electric charge speed The MOSFET of rate --- controllable attenuator 686 grid input can not provide with too high earth impedance can be with depletion capacitance Another path of the electric current of device.Therefore, envelope detector, it is effective as the audio signal exported by audio-frequency amplifier 688 Peak value integrator, the electric charge that is built up by the more high amplitude of the signal output of capacitor storage, and pass through second resistance For device with check rate discharge, the result voltage level that capacitor has charged to is provided to MOSFET grid input.

It should be noted that the description of envelope detector in Fig. 3 can than the more symbolism of schematic diagram theory of operation because According to one of ordinary skill in the art it will readily recognize that various parts replacement can be carried out.For example, passive two pole described Pipe can be replaced with active circuit, and the active circuit, which has, is more closely adapted to wherein forward bias voltage drop to be (or to connect very much The behavior of closely) zero ideal diode.It should also be noted that because diode and first resistor device coupled in series are got up to pass The output of defeated audio-frequency amplifier 688, the coupling order described can be overturn.It should further be noted that as depicted, Envelope detector 689 is the variant of half-wave envelope detector, and half-wave envelope detector only detects positive peak and (while ignores negative peak Value), can be the all-wave variant for detecting positive peak and negative peak simultaneously alternatively.In other words, more broadly, envelope is examined Surveying device 689 can be implemented by the other modes in addition to describing.

By the grid that envelope detector 689 is inserted to the output of audio-frequency amplifier 688 and the MOSFET of controllable attenuator 686 Between the input of pole (output with more directly coupling audio amplifier 688 is opposite to grid input), avoid making controllable attenuation The talk that device 686 provided and stopped providing each positive peak to occurring in the output with audio-frequency amplifier 688 is passed through The decay of the signal of microphone.On the contrary, controllable attenuator 686 is set to occur multiple peak values wherein more than audio-frequency amplifier 688 The period of the intended threshold level of output provides decay in a more continuous fashion, and only stops in such period after in the past Only provide decay (threshold value be at least in part the threshold voltage of the grid of the MOSFET by controllable attenuator and shown envelope examine The voltage drop setting of the forward bias voltage at the diode both ends for the envelope detector 689 surveyed in the particular implementation of device 689). Make during controllable attenuator 686 shows its behavior by this way, it is in RC circuits it is easily recognized by those of ordinary skill that, Envelope detector 689 responds the time for the peak value (first peak value of isolated peak or multiple adjacent peaks) for occurring more than predetermined threshold Delay (" start time ") must will be by the resistance of first resistor device and the capacitance settings of capacitor.Further, capacitor is abundant Required time (also referred to as " die-away time ") that exhausting makes MOSFET no longer provide voltage triggered decay must will be by capacitor Electric capacity and second resistance device resistance setting.Therefore, the electric capacity of capacitor and first resistor device and the resistance of second resistance device Selection be determined envelope detector 689 and controllable attenuator 686 cooperate caused by compressor reducer function behavior.

Envelope detector 626 is with describing base on envelope detector 689 by diode, resistor and capacitor This similar mode couples to be formed (still, as the situation in envelope detector 689, envelope detector 626 can be by a variety of Mode is implemented, including active circuit).However, replace being used for the signal peak for integrating the output of audio-frequency amplifier 688, envelope detected Device 626 is used to integrate the signal peak that communication microphone 125 exports, as envelope detector 626 is received by differentiating amplifier 625 's.As discussed previously, it is considered to be best practices are to realize microphone bass or microphone high pitch wire with ground only in earphone Any coupling of the position of the audio devices (that is, audio devices 9000) for any communication type that 1000a is coupled to by connector Close.Therefore, the positive input of coupled differential amplifier 625 and negative input can tap with microphone bass and microphone high pitch wire Its any signal delivered, without causing any of which (to utilize typical differential with being coupled in the position of voicefrequency circuit 600 The ultra-high-impedance of amplifier).But one of ordinary skill in the art will readily recognize that, the single-ended variant generation of amplifier is used For differentiating amplifier 625, microphone height may be coupled simultaneously to ground together with microphone bass signal is coupled in voicefrequency circuit 600 Sound signal is not unimaginable to the single ended input of such amplifier.

The output of the integration performed by envelope detector 626 is coupled to the gain input of voltage controlled avalanche oscillator 687, because And the signal of the integration of the signal peak for the audio for allowing to represent to be detected by communication microphone 125 is used for optionally reduction table Show the signal gain of the sound of the input for being supplied to audio-frequency amplifier 688 detected by current microphone 185 of talking.It should be noted that It is used as although depicting using the attenuator of the part independent and different from audio-frequency amplifier 688 in envelope detector The mechanism of gain can be reduced under 626 control, but can also be the gain of other embodiment, wherein audio-frequency amplifier 688 It is controllable and envelope detector 626 is more directly coupled to audio-frequency amplifier 688 (that is, with being coupled to sound in some manner The gain control input of audio amplifier 688) thereby using the reduction gain of audio-frequency amplifier 688.Describe at least in part actually The independence of gain reduction and different parts are realized, so as to illustrate to mean under the control of envelope detector 626 in gain reduction Perform, rather than gain increase.

In this way, the chain between the differential signal activity that microphone bass and microphone high pitch wire both ends occur The gain reduction of current audio of connecing and talk is formed so that when earphone 1000a user speaks, and is represented by current wheat of talking For a period of time, since the time be by envelope detected starting the time to the gain reduction of the signal for the sound that gram wind 185 detects The die-away time that the electric capacity of the capacitor of device 626 and the resistance of resistor control at least in part terminates.Therefore, open loop compressor reducer It is to be formed by implementing the interaction between the envelope detector 626 of the link and voltage controlled avalanche oscillator 687.This solves nothing By when user speaks, earphone 1000a user listens the sound of oneself to be more than normally by earphone 1000a talk current function The problem of degree.The people of the physiology and acoustics of being familiar with human language will readily appreciate that, hear their own when people speaks Voice is very normal, partially due to voice is transferred to by Eustachian tube, osteoacusis and by the other structures in neck and head from inside Human ear；And partially due to voice is transferred near two ears (assuming that reaching the entrance of its duct not from the air near its mouth It is capped).However, although user hears very normal, the work(but earphone 1000a talk is passed through that itself mentions such degree The sound of user oneself can probably be caused with unnatural high amplitude and/or with unhappy and/or distractive The change of some other modes is transferred to its ear, other sound (that is, sound of another person that coverage user it is expected to hear Sound).

Further, depending on current microphone 185 of talking is relative to the position near the mouth of user and/or user's voice Sound has much, and the voice of user oneself can be detected as fully loud by current microphone 185 of talking so that audio-frequency amplifier 688 amplification in normal gain level causes the pressure that triggering is provided by the combination of envelope detector 689 and controllable attenuator 686 Contracting function.Therefore, instead of user with side unnatural in unnatural loud and/or other modes by talk current function Formula hears the problem of sound of their own, it is understood that there may be user experience when user speaking and user pipe down moment it Afterwards during the die-away time duration lasts of compression function the problem of the momentary loss of talk current function.Depending on die-away time Length, this can actually by no matter when user speak and user pipe down after some extra phases period Between (that is, die-away time) cause user to hear that what other people are saying and preventing user from being talked with other people.In fact, For example, earphone 1000a user can ask other people problem, but it can not hear and itself ask questions or at least other people answer Beginning.By reduce be supplied to audio-frequency amplifier 688 to no matter when user speaks expression by the current Mike that talks The gain of the signal for the sound that wind 185 detects, talk current function is maintained on the gain level of reduction, while prevents user from listening In unnatural loud horizontal sound and being output to for audio-frequency amplifier 688 is prevented to reach the amplitude for triggering compression to it.

In order to increase the open loop compressor reducer formed by the combination of envelope detector 626 and voltage controlled avalanche oscillator 687 so as to Effectively prevent from undesirably triggering the closed loop compressor reducer formed by the combination of envelope detector 689 and controllable attenuator 686, by The startup time for the open loop compressor reducer that the combination of envelope detector 626 and voltage controlled avalanche oscillator 687 is formed must be shorter than by wrapping The startup time for the closed loop compressor reducer that the combination of network detector 689 and controllable attenuator 686 is formed.However, it is preferred that open loop Therefore compressor reducer general work, must there is choosing than the closed loop compressor reducer faster, die-away time of the open loop compressor reducer also shorter than The die-away time of the closed loop compressor reducer.

In pulse attenuator 680, the input coupling of amplifier of microphone 684 is to current microphone 185 of talking, with tap The signal of the sound of expression from current microphone 185 of talking after testing because those signal-selectivities pass through simulation Switch 681 is transferred to controllable attenuator 686.As depicted, the input of amplifier of microphone 684 is not by capacitor AC couplings Closing the current microphone 185 of talk, (such as input of audio-frequency amplifier 688 is coupled to the current microphone of talk by capacitor AC As 185), but other embodiment can be such.The output coupling of amplifier of microphone 684 is to capacitor, capacitor The first input and resistor, resistor for being further coupled to comparator 683 simultaneously are further coupled to ground.Capacitor and resistance Device cooperation forms high-pass filter, only allows the sound for representing higher frequency (that is, to have the sound of the frequency more than specific preset frequency Sound) the output from amplifier of microphone 684 signal by and reach the first of comparator 683 input.Comparator 683 Second input coupling is to voltage source, the further coupling grounding of voltage source.Voltage source provides reference voltage level to comparator, by height Bandpass filter is supplied to the voltage level of the signal of comparator 683 to be compared with the reference voltage level.The output of comparator 683 The input of monostable multivibrator 682 can be triggered again by being coupled to, and can trigger the output coupling of monostable multivibrator again to pulse The MOSFET of attenuator 680 grid input.MOSFET be further coupled to and analog switch 680 control input, so as to The control input of the analog switch 681 is optionally connect under the control for the output that can trigger monostable multivibrator 682 again Ground.The control input that the analog switch 681 is grounded by MOSFET causes analog switch 681 to be opened, thus interrupts to talk and lead to The coupling that the signal output of row microphone 185 passes through analog switch 681 with controllable attenuator 686.

Amplifier of microphone 684, comparator 683, monostable multivibrator 684 and miscellaneous part cooperation monitoring can be triggered again The signal exported by current microphone 185 of talking, and analog switch 681 is controlled optionally to couple current microphone of talking 185 to the controllable attenuator 686 of talk pass circuit 680 input.Therefore, pulse attenuator 680 by audio still to being amplified Another circuit that the audio signal that device 680 receives from current microphone 185 of talking works.It is somewhat like by envelope detector 689 and the compressor reducer that is formed of the cooperation of controllable attenuator 686, the monitoring of pulse attenuator 680 is talked current audio, and in response in table Show the specified conditions detected in the signal for current audio of talking and work.However, pulse attenuator 680 is than compressor reducer faster Ground works, and responds different condition.By using the peak value for being selected as integrating audio with startup time and die-away time Envelope detector 689, so as to avoid each individually peak value of response from providing compression, when the closed loop compressor reducer is only compressed in lasting Between there are multiple peak values the talk of too high amplitude pass through audio, it is thus impossible to which response is talked current microphone 185 fast enough The specific features of the single peak value (just and/or negative) of the sound of detection, so as to avoid allowing single peak value by audio-frequency amplifier 688 Amplify and totally tansitive to earphone 1000a user ear.

Pulse attenuator 680 poorly efficient is asked by using the high-pass filter formed by resistor and capacitor with solving this Topic, the resistor and capacitor are coupled to the first input of comparator 683 to play a part of differentiator, select resistance value and electricity Capacitance wherein starts with the single of the relatively rapid rate of change for exceeding the voltage level for predefining speed so as to detect The beginning of peak value.In addition, comparator 683 detects when that the voltage level of such beginning alreadys exceed predetermined voltage level.It is special It is not that differentiator combines described comparator in a manner of being described and forms differentiator and comparator combination, and the combination is with phase The beginning of positive peak is detected to fast rise time (not being relatively quick voltage level negative sense rate of change).Micro- using this During dividing and comparing, it is assumed that with the relatively rapid rise time with more than the predetermined rise time simultaneously and more than predetermined The peak value of the beginning of the voltage level of voltage level will be the peak that eventually arrives at undesirably too high amplitude (that is, voltage level) Value.In other words, although the Integrated peak of envelope detector 689, the longer of more high amplitude it is expected with compression ratio so as to detect Periodic event (therefore needing the peak value of multiple undesirably too high amplitudes to occur before testing), but differentiator and The combine detection of comparator seems to be likely to that the beginning of with not expecting high amplitude peak value will be reached, so as in fact Taken action before being reached on border.Substantially, pulse attenuator 680 attempts peak value as prediction, so as to first be sent out Response.

Again, it is noted that the variant of differentiator and comparator circuit can also, instead of or except detection as just Outside the beginning of peak value, beginning and the voltage level of the negative peak with relatively quick voltage level negative sense rate of change will be detected Where the amplitude of predetermined negative voltage level is exceeded.Therefore, the pulse attenuator 680 describes variant and should be considered as only one Individual example is implemented, and can be considered as a kind of more desirable pulse attenuator 680 of implementation in some situations, and its response did not expected high amplitude Positive peak or negative peak (that is, eventually arrive at the voltage level of positive voltage level or negative voltage level cross high amplitude peak value) Beginning, way is no matter the situation that it is negative sense rate of change or positive change rate exceedes predetermined variation rate by detection The high rate of change of voltage level and either positive voltage level or negative voltage level situation exceeded by detection it is relative In the predetermined voltage level of reference ground level.

In the implementation for the pulse attenuator 680 described, the beginning to detecting seemingly such (just) peak value Response is：By current microphone 185 of talking, from controllable attenuator 686, (therefore, final current microphone 185 of talking is put with audio The moment of the input of big device 688 disconnects) moment of the signal of output disconnects that (effectively downward moment is compressed to zero or shaken close to zero Width), so as to which the peak value of (just) that prevents to be predicted so is transferred to audio-frequency amplifier 688 so that it can not be transferred to ear forever The ear of machine 1000a user.It is noted, however, that other implementations of pulse attenuator 680 are also possible, wherein Response was compressed in lesser degree moment so that the peak value of (just) predicted can be heard in the amplitude in predetermined limits, Rather than moment disconnects (that is, downward moment is compressed to zero or close to zero amplitude).

However, pulse attenuator 680 actually implements (that is, no matter it detects one or both in positive or negative peak value Start, any part used during pulse attenuator 680 is implemented be preferably chosen to it is sufficiently fast in their operations, with To sufficiently rapidly it be operated as analog switch 681 (or its equivalent in other implementations), so as to prevent the peak value of prediction from passing It is handed to the input of audio-frequency amplifier 688.It is preferred, therefore, that pulse attenuator 680 have it is relatively quick so-called " during startup Between ", particularly compared with the startup time for the compressor reducer that envelope detector 689 and the cooperation of controllable attenuator 686 are formed.Moment breaks The duration (or lesser degree of compression in other possible implementations) opened is by that can trigger monostable multivibrator again 682 (or its equivalent in other implementations) are set as determining that the driving makes with signal driving MOSFET period MOSFET operation simulations switch 681 is opened to interrupt the coupling of talk current microphone 185 and controllable attenuator 686.It can touch again Hair monostable multivibrator 682 is preferably set to predetermined amount of time, and the predetermined amount of time is selected for the tight fit phase Hope from when the sound generation and the lasting expectation at least one peak value for it is expected obstruction for it is expected to be detected by the current microphone 185 of talk Between.It is desirable that, pulse attenuator 680, which plays the independent peak value that obstruction is almost such peak value, reaches audio-frequency amplifier 688 effect, other current audio sounds of talking from current microphone 185 of talking are being transferred to audio so as to minimize Interruption during amplifier 688.It is therefore further preferred to pulse attenuator 680 relatively quick so-called " is declined with same Subtract the time " action, particularly with the die-away time of the compressor reducer formed by envelope detector 689 and the cooperation of controllable attenuator 686 Compare.Finally, it is intended that earphone 1000a user can hear that another person speaks by current microphone 185 of talking, and And brief interruption is only undergone during listening other people to speak, the interruption is necessary undesirable to prevent to have The sound of the peak value of high amplitude is transferred to user's ear by audio-frequency amplifier 688 and acoustic driver 115.

In fact, with having the startup for being faster than envelope detector 689 and the startup time of die-away time as previously discussed The sound of user oneself is prevented to trigger out compression (by envelope detector 689 and controllable in order to play with die-away time The cooperation of attenuator 686) envelope detector 626 it is similar, it is preferred that when startup time of pulse attenuator 680 and decay Between it is also sufficiently fast, can similarly prevent with almost it is single cross high amplitude peak value (i.e., it is predicted that up to it is too high just/or bear The peak value of amplitude) the sounds trigger that detects of the current microphone 185 of talk go out compression.In other words, it is such as desired Such peak value of sound never reaches audio-frequency amplifier 688, so as to avoid it from being exaggerated and be transferred to user's ear, also phase Hope, such peak value of such sound never reaches audio-frequency amplifier 688, so as to avoid allowing the peak value of amplification form Envelope detector 689 and fully charged capacitor therein are reached to trigger compression.Do not including the situation of pulse attenuator 680 Under, following possibilities be present：Sound with the single peak value for crossing high amplitude can be by current microphone detection of talking, Ran Houyou Audio-frequency amplifier 688 amplifies and can make sound forming compressor reducer by envelope detector 689 and the cooperation of controllable attenuator 686 Acoustically exported to the ear of user by acoustic driver 115 before answering, but cause individual pulse with sufficiently high amplitude Can fully charged envelope detector 689 capacitor and so trigger compression so that during for startup by envelope detector 689 Between and the period user that represents of die-away time be deprived of talk current function --- the result will be unable to provide the user pair The protection of the peak value of talk traffic sounds, and it is attached extraly to cause in the brief moment in time after the peak value user to hear The content that closely other people are saying.

The earphone 1000a of a consideration concrete application is that infantry personnel are contemplating that the battlefield ring of gunshot and explosive sound Border.It is especially envisaged that when trigger the rifle of oneself using earphone 1000a infantry personnel.Previously described noise eliminates Mike The communication microphone 125 of wind will attempt to refuse the gunshot of the rifle from user, but current microphone 185 of talking will not be as This.Typical gunshot is analyzed to show, gunshot be by very high amplitude initial spike followed by substantially reducing The subsequent peak value of amplitude is formed (that is, the highly attenuating rate that amplitude after initial spike be present) so that cause maximum worry is just Beginning high amplitude peak value.The compressor reducer formed by envelope detector 689 and the cooperation of controllable attenuator 686 will be responded sufficiently slowly, So that peak value as permission is transmitted before being compressed from current microphone 185 of talking by audio-frequency amplifier 688 To acoustic driver 115, however, such peak value will be likely to have sufficiently high amplitude, and actually such peak value it Some periods afterwards trigger the compression to subsequent sound (including sound unrelated with gunshot).

However, pulse attenuator 680 in position when, the beginning of initial spike is by amplifier of microphone 684 from what is said or talked about The current microphone 185 of words receives, and amplifies before the high-pass filter formed by resistor and capacitor is supplied to, Ran Houti Supply comparator 683.Assuming that the rate of change for starting the predetermined variation rate with more than voltage level of initial spike, high-pass filtering Device allows currently exaggerated the first input for starting to be passed to comparator 683 of initial spike, its quilt in comparator 683 Compared with predetermined voltage level, the predetermined voltage level inputs the base provided by reference voltage source the second of comparator 683 Quasi- voltage level setting.Assuming that the current amplification of initial spike begins to exceed predetermined voltage level, the triggering of comparator 683 can be again Monostable multivibrator 682 is triggered, it is driven the input of MOSFET grid so that for monostable multivibrator can be triggered again The control input for the predetermined amount of time MOSFET coupled simulations switch 681 being set interrupts the current Mike that talks to ground The finally coupling sufficiently long time of the input of wind 185 and audio-frequency amplifier 688, so as to prevent initial spike from reaching audio amplification Device 688.

As its name, can trigger monostable multivibrator 682 again " can be triggered " so that one as current occur The individual period terminate before in response to detecting the beginning of another peak value with foregoing essential feature, the period can be opened again Begin, the period is set for it to cause the period of the opening of analog switch 681 (by driving MOSFET, as has been described ).Therefore, if there is the first peak value with preceding feature an example (that is, the initial spike of the first gunshot) with Be also with preceding feature the second peak value an example (that is, the initial spike of the second gunshot) so that can trigger again The action that the predetermined amount of time of monostable multivibrator 682 responds the beginning of the first peak value does not terminate also, then predetermined amount of time The beginning for responding the second peak value is restarted among the predetermined amount of time currently occurred.Therefore, can trigger again monostable more Harmonic oscillator causes the time quantum of the coupling of the current microphone 185 of the interruption talk of analog switch 681 and audio-frequency amplifier 688 to prolong It is long, so as to avoid the first peak value or subsequent peak value from being transferred to the input of audio-frequency amplifier 688.Although it can wherein trigger again monostable Multivibrator 682 by some other forms not can trigger timing means replace embodiment can also, it is preferred that Retriggerable timing means.Infantry scenario is returned to, can trigger the timing means of form again will allow pulse attenuator 680 more preferable Ground adapts to other full automatics that infantry shoots " machine gun " or shoots series of cartridges in rapid succession so that occurs quick Continuous gunshot, each gunshot have such initial spike for crossing high amplitude.The beginning of each such peak value of detection, Monostable multivibrator can be triggered again to be triggered again so as to repeatedly extend the period, can be triggered again in the period monostable Multivibrator 682 causes analog switch 681 (passing through MOSFET) to stay open, in order to prevent in quick continuous gunshot All such peak values are transferred to the input of audio-frequency amplifier 688.

The part of the electronic architecture 2000a introduced in Fig. 3 depictions 2a and 2b another possible variant.The variant is different The variant described in Fig. 2 a and 2b, wherein talk current function combination ANR functions.In addition, for simplicity, describe only with The part of the associated voicefrequency circuit 600 of one earplug 110 (therefore, an only acoustic driver 115).In view of on Fig. 2 a The extensive treatments of many implementation details are provided with 2b, such details repeats no more in figure 3, and therefore, higher level is presented in Fig. 3 Other description.

Describe and discuss on Fig. 2 b, voicefrequency circuit 600 includes differentiating amplifier 625, pulse attenuator 680, talked Talk about pass circuit 685 and envelope detector 626.However, as also described, different from what is described on Fig. 2 b and discuss, Voicefrequency circuit 600 further comprises summing junction 615, pulse attenuator 690 and ANR circuit 695.Pulse attenuator 690 it is defeated Enter to be coupled to a feedforward microphone 195, its output coupling to ANR circuit 695.And then ANR circuit 695, as current electricity of talking As road 685, it is coupled to envelope detector 626 so as to receive the signal of the sound detected to expression by communication microphone 125 The integral result of amplification form.Further, summing junction 615 inserts acoustic driver 115 and talk pass circuit 685 and ANR Between the output of circuit 695, driven so as to which these outputs be attached to it in the individual signals of acoustic driver 115.

Be familiar with ANR's skilled artisan will realize that, need to utilize based on feedback and ANR based on both feedforward forms One or more microphones, which detect undesirable noise, generation anti-noise sound and then acoustically export those in position, to be resisted Noise sound, simultaneous selection opportunity cause the cancellation acoustic interference to undesirable noise, so as at least reduce its acoustic magnitude. Earphone 1000a is included in the embodiment of the ANR based on feedforward, and at least one feedforward microphone 195 is held by earphone 1000a part OK so that the environment outside its volume for being acoustically coupled to be closed by earphone near human ear 110, so as to detect external environment condition In undesirable noise.ANR circuit 695 receives the electric signal for the noise for representing detected, and uses the noise as thus Generation is supplied to the reference sound of the anti-noise sound of acoustic driver 115 (by summing junction 615).

It is not as previously discussed talk of the compression out of talk pass circuit 685 under the control of envelope detector 626 The signal that current microphone 185 receives, similarly, ANR circuit 695 compress feedback wheat in the past under the control of envelope detector 626 The signal that gram wind 195 receives.Spoken in response to earphone 1000a user and reduce and represent the noise that is detected by feedforward microphone 195 The gain of signal may be considered as desired, as the situation of talk current function, be avoided that the voice of user oneself with Cross high amplitude and/or other unnatural variation characteristics are transferred to the ear of user oneself.Although commonly, wherein using ANR Many audio frequency ranges be largely less than the frequency range associated with people's voice, but the two scopes it Between the overlapping of some degree be present.As a result, the voice of the user of the communication headset 1000 detected by feedforward microphone 195 is (especially It is the user with deep sound) it can be handled by ANR circuit 695 as undesirable ambient noise, and make sound for its generation Learn the anti-noise sound that driver 115 acoustically exports.Mean to reduce the anti-noise sound of the more low frequency part of its voice Acoustics output there may be the undesirable acoustic phenomenon for making user feel under the weather or divert one's attention.Reduce and represent when a user speaks The gain of the signal of the noise detected by the ANR microphones 195 that feedover keeps the ANR functions of at least some of degree, reduces simultaneously At least amplitude of the anti-noise sound based on such voice.

As talk pass circuit 685 is coupled to the current microphone 185 of talk by pulse attenuator 680, ANR circuit 695 are coupled to feedforward microphone 195 by pulse attenuator 690.Pulse attenuator 690 preferably with the base of pulse attenuator 680 This is identical, and performs identical function.Although ANR circuit 695 attempt using by feedforward microphone 195 detect include it is single The noise of too high amplitude peak produces anti-noise sound, and when so doing, ANR circuit 695 can fail the mistake of counteracting initial noisc The distortion anti-noise sound with too high amplitude peak is produced in journey.The those of ordinary skill for being familiar with the ANR based on feedforward easily recognizes Know, there is the sound of abundant high amplitude, it is more likely that feedforward microphone 195 is no longer linear behavior, therefore, attempts to produce tool The anti-noise sound for having such high amplitude peak value is likely to actually produce more noises.Further, with talk pass circuit 685 Closed loop compressor reducer it is different without what, all think to be likely to corresponding compressor reducer in ANR circuit 695 be unable to fast-acting with There is the situation in prevention.Including corresponding pulse attenuator 690 therefore,.

It should be noted that although talk current microphone 185 and feedforward ANR microphones 195 to be portrayed as be independent and not Same microphone, alternate embodiment are possible, wherein shared microphone replaces both so as to provide public sound for two functions Sound detection input.Due to talking, both current microphone 195 and feedforward ANR microphones 195 are acoustically coupled to external environment condition, by It is preferably not that noise eliminates the microphone of type so that both can actually detect far field sound and near field sound in both Sound (is different from previously discussed communication microphone 125, it is configured to detect near field sounds while substantially ignores far field sound The noise of sound eliminates the microphone of type), the above is substituted and is possible.This is depended, at least partially, in the structure of communication headset With the presence or absence of single microphone can be positioned (in order to be acoustically coupled to surround earphone 1000a external environment condition and its user Head) one or more positions, its allow with to two functions all effective manner detect external voice.Should be further If it is noted that using single such microphone, then only need by individual pulse attenuator insert single microphone with Talk pass circuit 685 and ANR circuit 695 are between the two.

Additionally, it should be noted that in order to visually for purpose of brevity, only describe single acoustic driver 115 and in audio Its associated circuits (that is, talk pass circuit 685 and ANR circuit 695) in circuit 600.Therefore, have in communication headset 1000 In the embodiment for there are a pair of earplugs 110, a pair of acoustic drivers 115 be present, each acoustic driver has a pair of talks current Associated talk pass circuit in circuit 685 and the associated ANR circuit being coupled in a pair of ANR circuits 695 thereon, it is single Individual envelope detector 626 will be coupled into each talk pass circuit 685 and each ANR circuit 695.

Can in the electronic architecture 2000b and electronic architecture 2000b that Fig. 4 a and 4b depictions 1b earphone 1000b can be used With the variant of the voicefrequency circuit 600 used.The mode described in Fig. 4 a and 4b and described is in order to basic with Fig. 2 a and 2b respectively It is similar.In fact, as depicted, electronic architecture 2000b is substantially similar to electronic architecture 2000a, especially, in two frameworks Many aspects of voicefrequency circuit 600 are substantially similar, and work in a substantially similar manner.However, electronic architecture 2000b and electricity Subrack structure 2000a Main Differences be a lack of communicate microphone and in electronic architecture 2000b implement two-way communication its His support part, reflect that earphone 2000a supports bidirectional audio communication and earphone 2000b does not support this thing of bidirectional audio communication It is real.Another essence difference is control circuit 700 and voicefrequency circuit 600 is co-located at head assembly 100 in earphone 1000b It is interior, thus no longer need the independent control box 300 and upper cable 200 of the earphone 1000a in earphone 1000b.

Therefore, the microphone bass and microphone high pitch wire of the part for the electronic architecture being portrayed as in Fig. 2 a-2b are in electricity It is not present in subrack structure 2000b, therefore no longer describes in Fig. 4 a-4b.Pulse attenuator 680 is only portrayed as box in fig. 4b Shape, as it is likely that the mode substantially similar to the mode described on Fig. 2 b is implemented.In contrast, in fig. 4b in more detail Talk pass circuit 685 is described on ground, leads to so as to clearly describe the talk described in shortage voltage controlled avalanche oscillator 687 and Fig. 2 b The variant of row circuit 685.

Other embodiment and embodiment can all be endowed the guarantor of other rights of right in claim and applicant In the range of shield.

Claims (17)

1. it is a kind of control by the acoustic driver in the housing for the earplug for being arranged on earphone the sound acoustically exported method, Methods described includes：

In response to detecting more than predetermined voltage level and in the signal with more than the voltage level change rate of predetermined variation rate The beginning of peak value, and compression expression in the microphone for being acoustically coupled to the earphone of the external environment condition of the housing by detecting Sound the signal；And

In response to detecting communication microphone detection is eliminated by being arranged on towards the noise on the earphone near the mouth of user The voice of the user of the earphone arrived, and reduce the gain of the signal.

2. according to the method for claim 1, wherein compressing the signal includes preventing the peak value from being transferred to the earphone Part input.

3. according to the method for claim 2, wherein prevent the peak value be transferred to part input include Operation switch with The signal is disconnected from the input of amplifier.

4. according to the method for claim 1, wherein compressing the signal is included Signal Compression predetermined amount of time.

5. according to the method for claim 4, wherein the predetermined amount of time is retriggerable.

6. according to the method for claim 5, wherein it is associated with gunslinging sound to compress to select the predetermined amount of time Peak value.

7. according to the method for claim 1, wherein selecting in the predetermined voltage level and the predetermined variation rate extremely Few one with the compression peak value associated with gunslinging sound.

8. according to the method for claim 1, the microphone wherein talk that the microphone is the earphone is passed through.

9. a kind of earphone, including：

First earplug, including：

First housing；And

The first acoustic driver being disposed therein；

Carried by the structure of communication headset and be acoustically coupled to the first microphone of the first hull outside environment；

Be coupled to the voicefrequency circuit of first acoustic driver and first microphone, the voicefrequency circuit receive represent by The signal of the sound of first microphone detection and provide output to first acoustic driver；And

Noise eliminates communication microphone, is positioned about and couples relative to the mouth of user of first housing towards the earphone To the voicefrequency circuit,

Wherein described voicefrequency circuit is in response to the user of the communication headset detected by noise elimination communication microphone Voice example and reduce the gain of the signal；And

Wherein described voicefrequency circuit exceedes predetermined voltage level and with the voltage electricity more than predetermined variation rate in response to detecting The beginning of peak value in the signal of flat rate of change, and compress the signal.

10. earphone according to claim 9, include wherein the voicefrequency circuit compresses the signal：The voicefrequency circuit First component prevent peak value be transferred to the voicefrequency circuit second component input.

11. earphone according to claim 10, further comprise as the switch of the first component and as described the The amplifier of two parts, wherein compressing the signal includes operating the switch to disconnect the letter from the input of the amplifier Number.

12. earphone according to claim 9, wherein the voicefrequency circuit compression signal will including the voicefrequency circuit The Signal Compression predetermined amount of time.

13. earphone according to claim 12, further comprise that monostable multivibrator can be triggered again, it can be set Predetermined amount of time, the signal can be operated to by the compression predetermined amount of time and in the predetermined amount of time Between can be triggered again to restart the predetermined amount of time.

14. earphone according to claim 13, wherein it is associated with gunslinging sound to compress to select the predetermined amount of time Peak value.

15. earphone according to claim 9, wherein selecting at least one in predetermined voltage level and the predetermined variation rate The individual peak value associated with gunslinging sound with compression.

16. earphone according to claim 9, wherein first microphone is current microphone of talking, the audio-frequency electric Road includes talk pass circuit.

17. earphone according to claim 9, further comprises：

Second earplug, including：

Second housing；And

The second acoustic driver being disposed therein；

Carried by the structure of the communication headset and in the second Mike of the environment for being acoustically coupled to second hull outside Wind；

Wherein described voicefrequency circuit is coupled to second acoustic driver and the second microphone, and the voicefrequency circuit receives Represent another signal of sound for being detected by the second microphone and provide output to second acoustic driver；And

Wherein described voicefrequency circuit exceedes predetermined voltage level and with the voltage electricity more than predetermined variation rate in response to detecting The beginning of peak value in other signals of flat rate of change, and compress other described signals.