CN106804019B - Sound system with microphone and power amplifier work state display function - Google Patents

Abstract

The invention discloses an audio system with the function of displaying the working state of a microphone and a power amplifier. The microphone is provided with a super-audio signal generating circuit, an electroacoustic transducer, a sound pickup device and a sound pickup signal processing circuit; the mixer is provided with a signal distribution circuit. circuit, filter amplifier circuit, microphone channel on-off display circuit, channel signal processing circuit and integrated signal processing circuit, the integrated signal processing circuit is also connected to the power discharge, and the power amplifier is electrically connected to the speaker circuit; at the same time, a filter amplifier is also set in the mixer The rectification circuit and the amplification gain display circuit of the sound reinforcement channel are electrically connected to the filter amplification rectification circuit and the sound box circuit. The present invention displays the state of the entire channel from the microphone to the mixer, from the mixer to the power amplifier, and the sound box, so that the system can display the channel status between the microphone and the mixer in real time and uninterruptedly, and can also display the status of the power amplifier , The on-off status and volume of the speaker are displayed, which improves the reliability of use.

Description

Sound system with microphone and power amplifier working status display function

technical field

The invention relates to the technical field of audio equipment, in particular to an audio system with the function of displaying the working status of a microphone and a power amplifier.

Background technique

Audio system equipment is the most widely used media equipment, especially in education, business, entertainment, exhibition and other industries.

The audio system mainly includes microphones, mixers, power amplifiers and speakers, etc. There is often a problem with the audio system currently in use: the person using the microphone starts to speak, but finds that the microphone cannot produce sound, which affects the quality of the performance, delays time, and appears This situation is what the tuner is most worried about, but this kind of performance accident is hard to avoid, no matter how much preparation is done in advance, this kind of situation will still happen.

The common reasons why the microphone does not make a sound are: the person using the microphone turns off the power switch of the microphone or the mute switch is turned off, the connector of the microphone connection is not in good contact, the battery of the microphone is dead, the power amplifier is not turned on, or although it is turned on, The main volume switch of the mixer is turned too low, and there is a problem with the connection between the power amplifier and the speaker. Although the tuner can do a good job of debugging before the start, it is difficult to avoid failures due to the large number of people in an event, time constraints, and many people are not familiar with the use of microphones.

When the tuner is testing the microphone, he usually inputs a sound signal at the microphone end, and then listens to see if there is any sound output from the speaker, but it is impossible to test like this after the program starts, and the tuner cannot detect the microphone leading to the mixer Whether the whole process is normal, so if there is a problem with the microphone amplifier after the program starts, and it cannot be found in time, there will be a situation where the microphone and music cannot be played, which will affect the normal progress of the sound reinforcement, wasting time and affecting the effect. Sometimes irreparable damage is caused.

Contents of the invention

In view of the above-mentioned deficiencies, the technical problem to be solved by the present invention is to provide a sound system with the function of displaying the working status of the microphone and power amplifier. The function of displaying the on-off state and volume of the power amplifier speaker.

In order to solve the problems of the technologies described above, the technical solution of the present invention is:

A sound system with the function of displaying the working status of a microphone and a power amplifier, including a microphone, a mixer, a power amplifier and a sound box, the sound box is provided with a sound box circuit connected to the power discharge, and a sound box electrically connected to the sound box circuit speaker speaker,

The microphone is provided with a super-audio signal generating circuit, an electro-acoustic transducer electrically connected to the super-audio signal generating circuit, a pickup device placed near the electro-acoustic transducer, and an electrical connection with the pickup device. Connected pick-up signal processing circuit; the super-audio signal generated by the super-audio signal generating circuit is converted into super-audio sound signal by the electro-acoustic transducer, and the sound pickup device has picked up normal sound signal and super-audio sound simultaneously signal, the sound pickup device outputs a mixed signal of super audio signal and audio signal to the sound pickup signal processing circuit;

The mixer is provided with a signal distribution circuit electrically connected to the pickup signal processing circuit, and a filter amplifier circuit and a channel signal processing circuit electrically connected to the signal distribution circuit respectively; There is a microphone channel on-off display circuit electrically connected to the filter amplifier circuit, and an integrated signal processing circuit electrically connected to the channel signal processing circuit, and the integrated signal processing circuit is also connected to the power discharge;

After the signal distribution circuit receives the mixed signal processed by the pickup signal processing circuit, it divides the mixed signal into two paths, and one path is input to the filter amplifier circuit, and the filter amplifier circuit filters and amplifies the mixed signal to leave The super-audio signal input to the on-off display circuit of the microphone channel, the on-off display circuit of the microphone channel displays the on-off state of the microphone channel according to the presence or absence of the super-audio signal; the other input channel signal processing circuit, the channel The signal processing circuit processes the mixed signal and inputs it to the integrated signal processing circuit, and the integrated signal processing circuit outputs the mixed signal to the power amplifier;

The mixer is also provided with an electrically connected filter, amplify and rectify circuit and a sound reinforcement channel amplification gain display circuit, the filter, amplify and rectify circuit is electrically connected to the output end of the speaker circuit, and the filter, amplify and rectify circuit obtains the After the mixed signal of the speaker circuit, the audio signal part is filtered out, the super audio signal is rectified, and the obtained DC signal is transmitted to the amplification gain display circuit of the sound amplification channel for display.

Preferably, it also includes a microphone code display module, the microphone code display module includes a microphone code generation circuit arranged in the microphone, and a microphone code serial output circuit and a microphone code display circuit respectively electrically connected to the microphone code generation circuit circuit, and a first modulation circuit electrically connected to the microphone coding serial output circuit, the first modulation circuit is connected in series between the super audio signal generation circuit and the electro-acoustic transducer; the microphone The code display module also includes a first demodulation circuit arranged in the mixer and electrically connected to the filter amplifier circuit, and a microphone code display circuit of the mixer electrically connected to the first demodulation circuit; the microphone code generates The circuit generates coded signals, and the coded signals are respectively transmitted to the microphone code serial output circuit and the microphone code display circuit, the microphone code display circuit displays the received microphone code, and the microphone code serial output circuit converts the coded signal Generate a serial code, and input the first modulation circuit together with the super audio signal generated by the super audio signal generation circuit, the first modulation circuit modulates the encoded signal on the super audio signal, and the generated modulated signal is input to the An electro-acoustic transducer, the electro-acoustic transducer converts the modulated signal into a super-audio sound signal, which is picked up by the sound pickup device together with the external sound signal to form a mixed signal, and the mixed signal is input to the sound pickup signal processing circuit, The sound pickup signal processing circuit processes the mixed signal and transmits it to the signal distribution circuit arranged in the mixer, and the signal distribution circuit divides the signal into two paths, one of which is input to the filter amplifier circuit, and the The filter amplifier circuit filters and amplifies the mixed signal, filters out the audio signal, and the remaining super-audio modulation signal is input to the first demodulation circuit, and the first demodulation circuit demodulates the microphone code from the super-audio modulation signal signal, and the microphone coding signal is input to the microphone coding display circuit of the mixing console for display.

Preferably, it also includes a microphone conduction state verification module, and the microphone conduction state verification module includes a wireless receiving circuit, a second demodulation circuit, a comparison detection circuit, and a microphone channel conduction circuit that are sequentially electrically connected in the microphone. The on-state display circuit, the comparison detection circuit is electrically connected to the microphone code generation circuit of the microphone code display module; the microphone on-state verification module also includes sequentially electrically connected Read the microphone coding and serial output circuit, the second modulation circuit and the wireless transmitting circuit, the reading microphone coding and serial output circuit is electrically connected with the first modulation circuit, the wireless transmitting circuit is connected with the wireless receiving circuit Circuit wireless communication connection; the reading microphone code in the mixer and the serial output circuit sequentially read the coded signals demodulated by the first demodulation circuit in each microphone channel in the mixer, And each encoded signal is sequentially input to the second modulation circuit in a serial manner, and the second modulation circuit modulates each encoded signal into a radio frequency signal and inputs it to the wireless transmission circuit, and the wireless transmission circuit sends the radio frequency signal ; The wireless receiving circuit in the microphone receives the radio frequency signal transmitted by the wireless transmitting circuit, and inputs the radio frequency signal into the second demodulation circuit, and the second demodulation circuit demodulates the radio frequency signal, and demodulates the radio frequency signal The modulated coded signal is input to the comparison detection circuit, and the comparison detection circuit compares the coded signal transmitted from the second demodulation circuit and the microphone code generation circuit, and if the coded signal matches, then transmits a conduction signal to the The conduction state display circuit of the microphone channel shows conduction; if the matching code cannot be detected after a certain period of time, a non-conduction signal is transmitted to the conduction state display circuit of the microphone channel, and the conduction state display circuit of the microphone channel displays no conduction Pass.

Preferably, the super-audio signal generation circuit generates a sine wave signal with a frequency range of 21Khz-30Khz.

Preferably, the bandwidth of the signal amplifying circuit in the power amplifier includes the frequency of the super-audio signal generated by the super-audio signal generating circuit.

Preferably, the ratio of the level of the super-audio signal generated by the super-audio signal generating circuit to the highest level of the audio signal is less than 20%.

After adopting the above-mentioned technical scheme, the beneficial effect of the present invention is: because the audio system of the present invention has microphone and power amplifier working status display function, its microphone is provided with super-audio signal generation circuit, electroacoustic transducer, sound pick-up device and sound pick-up Signal processing circuit; the mixer is equipped with a signal distribution circuit, a filter amplifier circuit, a microphone channel on-off display circuit, a channel signal processing circuit and an integrated signal processing circuit. The integrated signal processing circuit is also connected to the power amplifier. The circuit is electrically connected; at the same time, a filtering, amplifying and rectifying circuit and an amplifying channel amplifying and gain displaying circuit are arranged in the mixing console, wherein the filtering, amplifying and rectifying circuit is also electrically connected with the speaker circuit. This enables the present invention to display the on-off of the entire channel from the microphone to the mixer, from the mixer to the power amplifier, and to the sound box in real time and uninterruptedly when the system equipment is turned on. If there is an interruption in the signal channel from the microphone to the mixer, then the microphone channel conduction status display circuit on the mixer will show that there is no continuity. If there is an interruption in the channel from the mixer to the power amplifier and then to the speaker, the sound amplification The channel amplification gain display circuit shows that the gain is zero. If the related gain adjustment switch is set too small, the amplification channel amplification gain display circuit gain is too small, so the tuner can eliminate the fault in time, and avoid the problem that it is not found after starting to use. common situation. Therefore the audio system with visible microphone communication on-off state of the present invention has the function of displaying the microphone channel on-off state in real time uninterruptedly, and also has the function of displaying the power amplifier sound box on-off state and volume, thereby improving the The reliability of the whole system reduces the labor intensity of the staff.

Description of drawings

Fig. 1 is the functional block diagram of embodiment one;

Fig. 2 is the functional block diagram of embodiment two;

Fig. 3 is the functional block diagram of embodiment three;

Fig. 4 is another partial functional block diagram of the third embodiment.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Embodiment one:

As shown in Figure 1, an audio system with the function of displaying the working status of a microphone and a power amplifier includes a microphone, a mixer, a power amplifier and a speaker. speaker speaker.

The microphone of the present invention is provided with a super-audio signal generating circuit, an electro-acoustic transducer electrically connected with the super-audio signal generating circuit, a pickup device placed near the electro-acoustic transducer, and a pickup signal electrically connected with the pickup device processing circuit.

The mixer of the present invention is provided with a signal distribution circuit electrically connected with the pickup signal processing circuit, and a filter amplifier circuit and a channel signal processing circuit electrically connected with the signal distribution circuit respectively; The circuit is electrically connected to the microphone channel on-off display circuit, and the integrated signal processing circuit is electrically connected to the channel signal processing circuit, and the integrated signal processing circuit is also connected to the power discharge.

Simultaneously, the mixer of the present invention is also provided with an electrically connected filter amplifying rectifier circuit and amplifying channel amplification gain display circuit, the filter amplifying rectifier circuit is electrically connected with the sound box circuit, after the filter amplifying rectifying circuit obtains the signal of the sound box circuit, and After the signal is filtered, amplified and rectified, it is transmitted to the amplification gain display circuit of the sound reinforcement channel for display.

As shown in Figure 1, when the audio system with microphone and power amplifier working state display function of the present invention works, the superaudio signal generated by the superaudio signal generating circuit in the microphone is converted into superaudio sound signal by the electroacoustic transducer, so that The pickup device in the microphone simultaneously picks up the normal sound signal and the super-audio sound signal, and the pickup device outputs a mixed signal of the super-audio signal and the audio signal to the pickup signal processing circuit. After the pick-up signal processing circuit inputs the mixed signal into the signal distribution circuit of the mixing console, the signal distribution circuit divides the mixed signal into two paths, and one path is input into the filter amplifier circuit, and the filter amplifier circuit filters and amplifies the mixed signal and remains super Audio signal input microphone channel on-off display circuit. If the microphone channel is in the conduction state, the super audio signal is transmitted to the mixer, and after filtering and amplification processing, the microphone channel on-off display circuit displays conduction; otherwise, the microphone channel on-off display circuit displays non-conduction. Therefore, the sound system of the present invention can be found before use, and the fault can be eliminated in time, thereby improving the reliability of the use of the sound system.

At the same time, the signal distribution circuit in the audio system mixer of the present invention inputs another mixed signal into the channel signal processing circuit. The mixed signal is input to the power amplifier after being amplified by the channel signal processing circuit, then input to the speaker after being amplified by the power amplifier, and finally transmitted to the speaker of the speaker after passing through the speaker circuit. After the mixed signal passes through the speaker circuit, it is also transmitted to the filter, amplify and rectify circuit in the mixer. The mixed signal passes through the filter, amplify and rectify circuit, and the audio signal is filtered out to leave the super audio signal. After amplification and rectification, the DC signal is output to the amplifier. Audio channel amplification gain display circuit, so that the on-off state and volume of the speaker are displayed. Therefore the audio system of the present invention can not only display the on-off state of the microphone channel, but also display the on-off state and the volume of the power amplifier sound box, so that the state of the power amplifier and the sound box can also be monitored, and in case of failure, it can also be eliminated in time, and further Improve the reliability of system use.

The super-audio signal generating circuit of this embodiment generates a sine wave signal with a frequency range of 21Khz-30Khz.

The bandwidth of the power amplifier signal amplifying circuit includes the frequency of the super-audio signal generated by the super-audio signal generating circuit.

The percentage of the super-audio signal level generated by the super-audio signal generating circuit and the highest level of the audio signal is less than 20%. generated interference.

In summary, the audio system with visible working status of the microphone and power amplifier of the present invention can display the entire channel from the microphone to the mixer, from the mixer to the power amplifier, and to the sound box in real time and uninterruptedly when the system equipment is turned on. on and off. If there is an interruption in the middle of the channel, the mixer will display no continuity, indicating that there is a fault; otherwise, it will display continuity, indicating that the microphone to the mixer is in normal working condition. Or if the gain is too small, it can also be displayed on the mixer, so the tuner can troubleshoot in time to avoid the situation that it cannot be turned on after starting to use.

The invention greatly improves the reliability of the audio system, reduces the possibility of audio accidents, improves work efficiency, reduces the work intensity of staff, and brings relatively good economic and social benefits to the huge audio system market.

Embodiment two:

This embodiment is basically the same as Embodiment 1, the difference is:

As shown in Figure 2, it also includes a microphone code display module, the microphone code display module includes a microphone code generation circuit arranged in the microphone, and a microphone code serial output circuit and a microphone code display circuit electrically connected to the microphone code generation circuit respectively, And the first modulation circuit electrically connected with the microphone coding serial output circuit, the first modulation circuit is connected in series between the super audio frequency signal generation circuit and the electroacoustic transducer; the microphone coding display module also includes being arranged in the mixing console and The filter amplifier circuit is electrically connected to the first demodulation circuit, and the mixer microphone code display circuit is electrically connected to the first demodulation circuit.

As shown in Figure 2, in the audio system of the present embodiment, the microphone code generating circuit generates coded signals, and the coded signals are transmitted to the microphone coded serial output circuit and the microphone coded display circuit respectively, and the microphone coded display circuit displays the received microphone codes, and the microphone The coded serial output circuit generates serial codes from the coded signal, and inputs the first modulation circuit together with the super-audio signal generated by the super-audio signal generation circuit, and the first modulation circuit modulates the coded signal on the super-audio signal, and the generated modulated signal is input Electro-acoustic transducer, the electro-acoustic transducer converts the modulated signal into a super-audio sound signal, which is picked up by the pickup device together with the external sound signal to form a mixed signal, and the mixed signal is input to the pickup signal processing circuit, and the pickup signal is processed The circuit processes the mixed signal and transmits it to the signal distribution circuit installed in the mixer. The signal distribution circuit divides the signal into two channels, one of which is input to the filter amplifier circuit, and the filter amplifier circuit filters and amplifies the mixed signal to filter out the audio signal. , the remaining super-audio modulation signal is input to the first demodulation circuit, the first demodulation circuit demodulates the microphone code signal from the super-audio modulation signal, and the microphone code signal is input to the microphone code display circuit of the mixer for display.

Embodiment three:

This embodiment is basically the same as Embodiment 2, the difference is:

As shown in Fig. 2, Fig. 3 and Fig. 4, it also includes a microphone conduction state verification module, and the microphone conduction state verification module includes a wireless receiving circuit, a second demodulation circuit, a comparison detection circuit and a microphone channel conduction circuit located in the microphone. The on-state display circuit, the comparison detection circuit is electrically connected to the microphone code generation circuit of the microphone code display module; the microphone on-state verification module also includes a sequentially electrically connected reading microphone code and serial output circuit located in the mixer, The second modulating circuit and the wireless transmitting circuit read the code of the microphone and the serial output circuit is electrically connected with the first modulating circuit, and the wireless transmitting circuit is connected with the wireless receiving circuit for wireless communication.

As shown in Fig. 2, Fig. 3 and Fig. 4, the audio system of this embodiment has added a microphone code verification function, that is, whether the microphone channel is connected by whether the microphone can receive the microphone code signal returned from the mixer , The user of the microphone can directly see whether the channel of the microphone is connected from the microphone, so that when the system fails, it can be eliminated more quickly. When the audio system of the present embodiment is working specifically, the coded signal demodulated by the first demodulation circuit in each microphone channel in the mixer is read in turn by the serial output circuit in the mixer. , and sequentially input each coded signal into the second modulation circuit in a serial manner, the second modulation circuit modulates each coded signal into a radio frequency signal and inputs it to the wireless transmitting circuit, and the wireless transmitting circuit sends out the radio frequency signal. The wireless receiving circuit installed in the microphone receives the radio frequency signal transmitted by the wireless transmitting circuit, and inputs the radio frequency signal into the second demodulation circuit, and the second demodulation circuit demodulates the radio frequency signal, and inputs the demodulated coded signal into the comparison detection circuit , the comparison detection circuit compares the coded signal transmitted from the second demodulation circuit and the microphone code generation circuit, if the coded signal matches, then transmits a conduction signal to the microphone channel conduction state display circuit to display conduction; if it cannot pass through a certain period of time When the matching code is detected, a non-conduction signal is transmitted to the microphone channel conduction state display circuit, and the microphone channel conduction state display circuit displays non-conduction.

The preferred embodiment of the present invention described above is only, not in order to limit the present invention, all any modification done within the spirit and principle of the present invention, is equivalent to a kind of sound system structure with microphone and power amplifier working state display function Improvements and the like should all be included within the protection scope of the present invention.

Claims (5)

1. the sound system with microphone and power amplifier work state display function, including microphone, sound console, power amplifier and speaker, institute The speaker circuit for being equipped in speaker and being electrically connected with the power amplifier, and the speaker of voice box being electrically connected with the speaker circuit are stated, It is characterized in that,

Equipped with superaudio signal generating circuit, the electroacoustic transduction being electrically connected with the superaudio signal generating circuit in the microphone Device, the pickup device being placed near the electroacoustic transducer, and the pickup signal processing electricity being electrically connected with the pickup device Road；The superaudio signal that the superaudio signal generating circuit generates is converted into superaudio sound letter by the electroacoustic transducer Number, the pickup device has picked up normal voice signal and superaudio voice signal simultaneously, and the pickup device exports Supersonic The signal that frequency signal and audio signal mix gives the pickup signal processing circuit；

The signal distribution circuit being electrically connected with the pickup signal processing circuit is equipped in the sound console, and respectively with it is described The filter amplification circuit and channel signal processing circuit of signal distribution circuit electrical connection；It is additionally provided in the sound console and the filter The electrical connection of wave amplifying circuit microphone channel on-off display circuit, the integrated signal that is electrically connected with the channel signal processing circuit Processing circuit, the Comprehensive Signal Processing circuit are also electrically connected with the power amplifier；

After the signal distribution circuit has received the mixed signal after the pickup signal processing circuit processes, mixing is believed Number it is divided into two-way, inputs the filter amplification circuit all the way, the filter amplification circuit will be left after mixed signal filter and amplification Superaudio signal input the microphone channel on-off display circuit, the microphone channel on-off display circuit is believed according to superaudio Number the presence or absence of display microphone channel on off operating mode；Another way inputs the channel signal processing circuit, at the channel signal Reason circuit inputs the Comprehensive Signal Processing circuit after handling mixed signal, and the Comprehensive Signal Processing circuit is by mixed signal It exports to the power amplifier；

The filter and amplification rectification circuit of electrical connection is additionally provided in the sound console and the channel gain amplifier display circuit that amplifies, it is described Filter and amplification rectification circuit is electrically connected with the speaker circuit output end, and the filter and amplification rectification circuit obtains the speaker electricity After the mixed signal on road, audio signal parts are filtered out, by superaudio signal rectification, obtained direct current signal is transferred to the expansion Message road gain amplifier display circuit goes to show.

2. the sound system according to claim 1 with microphone and power amplifier work state display function, which is characterized in that It further include microphone coding display module, the microphone coding display module includes that the microphone coding being placed in microphone generates electricity Road, and the microphone coded strings line output circuit and microphone coding display electricity that are electrically connected respectively with microphone coding generative circuit Road, and the first modulation circuit being electrically connected with microphone coding serial output circuit, first modulation circuit are serially connected in Between the superaudio signal generating circuit and the electroacoustic transducer；The microphone coding display module further includes being placed in tune The first demodulator circuit being electrically connected in sound platform with the filter amplification circuit, the sound console being electrically connected with first demodulator circuit Microphone encodes display circuit；

The microphone coding generative circuit generates encoded signal, and encoded signal is transferred to the microphone coding Serial output electricity respectively Road and the microphone encode display circuit, and the microphone coding display circuit shows that the microphone coding received, the microphone are compiled Encoded signal is generated serial code by sequence line output circuit, the superaudio signal generated with the superaudio signal generating circuit First modulation circuit is inputted together, and encoded signal is modulated on superaudio signal by first modulation circuit, generation Modulated signal inputs the electroacoustic transducer, and modulated signal is converted into superaudio voice signal by the electroacoustic transducer, and outer The voice signal in portion is picked up simultaneously by pickup device form mixed signal together, and mixed signal is input to the pickup signal processing Circuit, the pickup signal processing circuit are transferred to the signal distribution electricity being located in sound console after handling mixed signal Signal is divided into two-way by road, the signal distribution circuit, wherein it is input to the filter amplification circuit all the way, the filter and amplification Circuit is filtered amplification to mixed signal, filters audio signal, and remaining Supersonic frequency modulation is input to first solution Circuit is adjusted, first demodulator circuit demodulates microphone encoded signal, the input of microphone encoded signal from Supersonic frequency modulation It is shown to sound console microphone coding display circuit.

3. the sound system according to claim 2 with microphone and power amplifier work state display function, which is characterized in that It further include microphone on state authentication module, the microphone on state authentication module includes the successively electricity being located in the microphone The wireless receiving circuit of connection, the second demodulator circuit compare detection circuit and microphone channel on state display circuit, the ratio It is electrically connected compared with detection circuit with the microphone coding generative circuit of microphone coding display module；The microphone on state Authentication module further includes the reading microphone coding parallel series output circuit, the second tune that are sequentially connected electrically being located in the sound console Circuit and radio transmitter processed, the reading microphone coding parallel series output circuit are electrically connected with first modulation circuit, The radio transmitter is connect with the wireless receiving circuit wireless telecommunications；

Be located in sound console it is described read microphone coding parallel series output circuit circuit sequentially read it is each in the sound console The encoded signal that the first demodulator circuit in microphone channel demodulates, and each encoded signal is sequentially input in a serial fashion Each encoded signal is modulated into radiofrequency signal and inputs the wireless transmission by second modulation circuit, second modulation circuit Circuit, the radio transmitter send radiofrequency signal；

It is located at the radiofrequency signal that the wireless receiving circuit in microphone receives radio transmitter transmitting, and by radiofrequency signal Second demodulator circuit is inputted, second demodulator circuit demodulates radiofrequency signal, and the encoded signal that demodulation is obtained is defeated Enter the relatively detection circuit, the relatively detection circuit will be from the second demodulator circuit and microphone coding generative circuit transmission The encoded signal come is compared, and Continuity signal is transmitted if encoded signal is consistent and gives microphone channel on state display electricity Road display conducting；If cannot be detected by certain time be consistent coding if transmission be not turned on signal to the microphone channel conducting Status display circuit, the microphone channel on state display circuit, which is shown, to be not turned on.

4. the sound system according to any one of claims 1 to 3 with microphone and power amplifier work state display function, It is characterized in that, what the superaudio signal generating circuit generated is that frequency range is 21 Khz~30Khz sine wave signal.

5. the sound system according to any one of claims 1 to 3 with microphone and power amplifier work state display function, It is characterized in that, the bandwidth of the signal amplification circuit in the power amplifier includes the superaudio that the superaudio signal generating circuit generates Signal frequency.