CN1046068C - Digital gating audio-visual teaching wireless sound transmission and aid system - Google Patents
Digital gating audio-visual teaching wireless sound transmission and aid system Download PDFInfo
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Abstract
A digital selective-electrifying teaching wireless sound-transmitting and sound-boosting system is composed of central radio signal transmitter, wireless sound-transmitting transmitter, addressed dual-channel power amplifier receiver and radio voice pager, and features that it can broadcast public to the group, and can select the object to be listened by digital address code.
Description
The present invention relates to a kind of digital selecting-pass radio microphone aid system for electrical teaching, belong to the broadcast communication technical field;
In teaching field, often exist the classroom vector product bigger, listen numerous, teacher's voice burden is big, suffers from the occupational pharyngolaryngitis more, and ambient noise causes that greatly student's hearing descends the degradation problem gradually, therefore, it is more and more to carry out the situation of electronic teaching by microphone aid system for electrical teaching.Concerning a teaching unit, both may broadcast colony and (as open conference in unified time, do setting-up exercises during the break, broadcast notice or news), again may be in the scope of predesignating pleasant to hear (as to a grade or first floor), play certain information, this just requires information transmission one to select listening to object as main body, under special circumstances, even only select one to listen to object (as messenger call or scheduling teacher), this is the place that Education Literature System is different from the broadcasting station.In addition, have the Education Literature System of above-mentioned functions, also should have concurrently certainly in indoor wireless microphone emission, the function that transmission of speech signals is amplified in the sound amplifier reception utilized.As the situation of giving a lesson in the many classrooms of people.
From the technical merit and the product of current communication equipment, realize the some functions in the above-mentioned functions singlely, all have mature technique.But, to in an independent system, satisfy above-mentioned several the functions of electronic teaching simultaneously, such system then yet there are no, through the Searches of Patent Literature, and consulted and retrieved domestic and international newpapers and periodicals and books since 1985, all do not find the system that can satisfy above-mentioned several the functions of electronic teaching simultaneously.Recently, a kind of " radio audio amplifier; though have the microphone signal transmitter of the transaudient usefulness of pocket radio; a subsidiary clip-on microphone and a wear-type mini microphone; on its formula receiver, also have a recorder signal input socket and a volume knob; this product can not satisfy every requirement of electronic teaching on serviceability; and price is higher of selling on the Hongkong market, every cover is roughly equal to 2200 yuan of RMB, as the bigger teaching equipment of use amount, price is disliked expensiveness.
On the other hand, the present transaudient public address system of domestic and international existing part single-use radio, its audio amplifier generally hang on the wall or put in from talker ground ten thousand far away, and volume adjustment knob is contained on the audio amplifier, and it is very inconvenient therefore to regulate volume.
The objective of the invention is to overcome the weak point of above-mentioned every technology and a kind of digital selecting-pass radio microphone aid system for electrical teaching is provided, it can be broadcasted colony in unified time, can be that main body is carried out digital gating or cancellation to object pleasant to hear with the emission main frame again, thereby broadcasting information in the scope of predesignating pleasant to hear, also have concurrently simultaneously and in same classroom, utilize the wireless microphone emission, sound amplifier is by the function of the big transmission of speech signals of folding and unfolding, to satisfy every requirement of Education Literature System, and this system also has stable and reliable for performance, cheap, be convenient to popularize the advantage of using.
Purpose of the present invention can reach by following measure:
The present invention is made up of wireless centrex signal of telecommunication transmitter 1, radio microphone transmitter 2, band address binary channels power amplifier receiver 3, radio voice paging machine 4 and Broadcast Control order generator 5, it is the radiofrequency signal of f0 that wireless centrex signal of telecommunication transmitter 1 had both been launched the frequency that is loaded with the language input signal, so that carry out public broadcasting in unified time, when simultaneously, wireless centrex signal of telecommunication transmitter 1 utilizes its high-frequency signal modulation again another independently radio multiplex broadcasting channel transmits the signal that has numerically coded instruction and address; Radio microphone transmitter 2 becomes the voice signal of mini microphone 11 into selected wireless transmission medium, radio wave, infrared ray or ultrasonic wave) modulation signal launch by emitting head 15; The radiofrequency signal of wireless centrex signal of telecommunication transmitter (1) is received by band address binary channels power amplifier receiver (3) and radio voice paging machine (4), and band address binary channels power amplifier receiver (3) also receives the signal of radio microphone transmitter (2) by wireless receiving head (19); Band address binary channels power amplifier receiver 3 has two receiving terminals, and one of them receiving terminal receives the public broadcasting signal of wireless centrex signal of telecommunication transmitter 1.Another wireless receiving head 19 receives the signal of the emitting head 15 of radio microphone transmitter 2: Broadcast Control order generator 5 links to each other with wireless centrex signal of telecommunication transmitter 1, sends various command and gating as required or cancels object pleasant to hear; Band address binary channels power amplifier receiver 2 receives Broadcast Control order and geocoding, again not by 2 lockings of radio microphone transmitter, just public broadcasting is broadcasted during as selected colluding; As temporarily being locked, even gating then just broadcasts public broadcasting after also will waiting for release by the signal of radio microphone transmitter 2.
Wireless centrex signal of telecommunication transmitter 1 has a, b two-way microphone voice signal (respectively from seat formula microphone and telephone receiver) and c, d two-way line signal (respectively from CD player and radio-cassette player) input, wireless centrex signal of telecommunication transmitter 1 is by low frequency signal processor 6, encoder 8, coded data signal modulator 9, dual signal blender 7, f
0Rf modulations and radio-frequency (RF) power amplification circuit 10 are formed, a, and b, c, four inputs of d are received low frequency signal processor 6, after handling in earlier stage through level adjustment, four road signal mixing, noise reduction, compression, preposition amplification etc., output to dual signal blender 7; On the other hand, another low frequency channel when wireless centrex signal of telecommunication transmitter 1 utilizes its high frequency modulated, the signal of Broadcast Control order generator 5 is input to encoder 8, encoder 8 time-devision system or the frequency division system signal of coding according to certain rules outputs to coded data signal modulator 9, the code signal that coded data signal modulator 9 will be modulated on a certain subcarrier frequency is also received dual signal blender 7, dual signal blender 7 will output to f after will mixing from the signal of low frequency signal processor 6 and coded data signal modulator 9
0Rf modulations and radio-frequency (RF) power amplification circuit 10, last, f
0Rf modulations and radio-frequency (RF) power amplification circuit 10 are launched public broadcasting signal RF radio wave by antenna.
Speech signal is f for the frequency of wireless centrex signal of telecommunication transmitter 1
0The modulation system of radiofrequency signal, both can be mode of frequency regulation, also can be amplitude modulation or pm mode.Coded system in order to transmission digital gating instruction address code signal can be any digital information transmission mode that is easy to discern; Mode in order to the passage that transmits this code signal, both can be SCA (frequency modulation sub-broadcast) mode, also can be to adopt one of the mode of an autonomous channel of generation under the orthogonal balanced modulation system or multichannel modes of other usefulness radio multiplex broadcasting technology realizations.
Band address binary channels power amplifier receiver 3 is by wireless receiving head 19, wireless signal demodulation processor 20, high-frequency signal is handled and binary channels split circuit 24, low frequency signal processor 21, low frequency signal processor 25, this machine self-locking flip and flop generator 22, self-locking time-delay logical circuit 23, low frequency signal switch and center logic controller 26, digital gating channel demodulator 28, gating command decoder 29, geocoding comparator 30, this machine address DIP device 32, this machine gating beep generator-positioning indicator-power amplifier soft initiator 31 and dual track power amplifier 27 are formed, here adopting the dual track power amplifier is corresponding to the situation with two sound box type receivers, and in fact this dual track has transmitted the same audio signal of two-way same-phase with amplitude.Band address binary channels power amplifier receiver 3 has two receiving terminals, one is the wireless receiving head 19 that receives the transmitted wave of radio microphone transmitter 2, one is the high frequency receiving terminal that receives the public broadcasting radio wave, wireless signal demodulation processor 20 is received in the output of wireless receiving head 19, low frequency signal processor 21 is received in the output of wireless signal demodulation processor 20, two outputs of low frequency signal processor 21 are auspicious, one terminates to low frequency signal switch and center logic controller 26, the other end is received self-locking time-delay logical circuit 23, this machine self-locking flip and flop generator 22 is received in the output of self-locking time-delay logical circuit 23, and low frequency signal switch and center logic controller 26 are received in the output of this machine self-locking flip and flop generator 22.Self-locking time-delay logical circuit 23 is one and is specifically designed to the 1KHz phase-locked loop that has or not the 1KHz signal in the monitoring channel, when receiving the 1KHz signal and can keep more than 4 seconds, phase-locked loop is just opened this machine self-locking flip and flop generator 22 of its back, and make it send " self-locking of this a machine " signal to center logic controller 26, make it place lock-out state, switch keeping is at " this machine " state, i.e. the state of the language audio signal only transmitted from radio microphone transmitter 2 in this classroom of the input signal of dual track power amplifier 27.At this moment, no matter whether send gating signal in the exchange channel, it is constant that system maintains local state all the time, just resets after 2 shutdown of radio microphone transmitter.On the other hand, the f that receives from antenna
0High-frequency signal is input to high-frequency signal and handles and binary channels split circuit 24, two output channels of binary channels split circuit 24, one is the main channel, output public broadcasting information, it receives low frequency signal processor 25, another is exactly to be modulated on a certain frequency subcarriers and with the digital gating signal of certain rule coding, it receives digital gating channel demodulator 28, gating command decoder 29 is received in the output of digital gating channel demodulator 28, geocoding comparator 30 is received in the 29 decoded outputs of gating command decoder, the output of decoded result and this machine address DIP device 32 is compared, result relatively is by the two-way output in 30 fens of geocoding comparator, one the tunnel receives this machine gating beep generator-positioning indicator-power amplifier soft initiator 31, low frequency signal switch and center logic controller 26 are received in another road, low frequency signal switch and center logic controller 26 are also received in the output of low frequency signal processor 25, at last, the output of center logic controller 26 is received the binary channels power amplifier, in other words, the binary channels power amplifier only conforms at geocoding (promptly by gating or cancellation) and the public broadcasting signal could be exported or cut off to radio microphone transmitter 2 when center logic controller 26 is in the lock state.These characteristics are well suited for the requirement of electronic teaching, serve as a teacher and close to an end on class and this moment when being with address binary channels power amplifier receiver 3 by gating, the teacher just can temporarily seal public broadcasting by " locking of this machine ", treats that this class has been said again to unlock, and recovers public broadcasting.For reaching the purpose of imparting knowledge to students continuously uninterruptedly in a long time, the teacher also can carry out this operation in advance.
Radio voice paging machine 4 is by high-frequency signal processor 33, low frequency signal processor 34, demodulated data signal device 36, gating command decoder 37, this machine address DIP device 39, geocoding comparator 40, gating drives and beep generator 41,30 seconds digital speech memories and positioning indicator 38, band is formed by the low-power audio amplifier 35 of end, the output of high-frequency signal processor 33 is received low frequency signal processor 34 and demodulated data signal device 36, the output of demodulated data signal device 36 is received gating command decoder 37, the output one of gating command decoder 37 terminates to geocoding comparator 40, the other end is received 30 seconds digital speech memories and positioning indicator 38, geocoding comparator 40 is received in the output of this machine address scrambler 39, the output of geocoding comparator 40 is received gating and is driven and beep generator 41, at last, the low-power audio amplifier 35 of band by end all received in the output of the output of the output of gating driving and beep generator 41 and low frequency signal processor 34 and 30 seconds digital speech memories 38.Radio voice paging machine 4 is specially for some does not need a kind of language beep-pager that place (as teaching and research room, clinic, office etc.) that high-power voice signal emits is designed in the teaching unit, these local people can be heard notify from a phone call or small collectives broadcasting, and do not need to utilize radio microphone transmitter and player, make the native system more perfect function.
The drawing explanation of accompanying drawing:
Accompanying drawing 1 is the block diagram of digital selecting-pass radio microphone aid system for electrical teaching of the present invention.
Accompanying drawing 2 is the block diagram of wireless centrex signal of telecommunication transmitter 1 of the present invention.
Accompanying drawing 3 is the block diagram of radio microphone transmitter 2 of the present invention.
Accompanying drawing 4 is the block diagram of band of the present invention address binary channels power amplifier receiver 3.
Accompanying drawing 5 is the block diagram of radio voice paging machine 4 of the present invention.
Accompanying drawing 6 is the low frequency signal processor circuit figure when transmitting four tunnel audio signals during with the mono FM broadcast mode for the wireless centrex signal of telecommunication transmitter of the embodiment of the invention.
F when accompanying drawing 9 is the realizing with mode of frequency regulation of wireless centrex signal of telecommunication transmitter of the embodiment of the invention
0Rf modulations and radio-frequency (RF) power amplification circuit diagram.
Accompanying drawing 10 is the radio microphone transmitter of embodiment of the invention input microphone, emitting head output (or antenna) and the low frequency signal processor circuit figure during with FM radio set mode transmission of one line language audio signal.
Wireless modem, a wireless transmission circuit diagram when accompanying drawing 12 is realized radio microphone for the radio microphone transmitter of the embodiment of the invention in the FM radio set mode.
Wireless receiving head, high-frequency wireless signals demodulation processor, low frequency signal processor, this machine self-locking flip and flop generator, self-locking time-delay logic, prompt tone buzzer circuit figure when accompanying drawing 15 is the receiving with the transmitter corresponded manner of band address binary channels power amplifier receiver of the embodiment of the invention.
Accompanying drawing 16 be the embodiment of the invention this machine dual track power amplifier, positioning indicator, power amplifier soft initiator and the power circuit diagram of band address binary channels power amplifier receiver.
Accompanying drawing 17 is high-frequency signal processor, low frequency signal processor, the demodulated data signal device circuit diagram of the radio voice paging machine of the embodiment of the invention.
Accompanying drawing 18 be the embodiment of the invention gating command decoder, this machine address DIP device, geocoding comparator, gating driving and beep generator, the buzzer circuit figure of radio voice paging machine.
Accompanying drawing 19 is 30 seconds digital speech memories and the positioning indicator and the power circuit diagram of the radio voice paging machine of the embodiment of the invention.
Now in conjunction with the accompanying drawings the present invention and specific embodiment are done further narration:
Because the embodiment of the invention constitutes with integrated circuit, the functional circuit that some integrated circuit comprises is a lot, so the many integrated circuits that lain in of aforesaid circuit connection relationship of the present invention have suffered, therefore only narrate the input and output connection relationship which circuit these integrated circuits comprise and appear.
As Fig. 6, the low frequency signal processor of the wireless centrex signal of telecommunication transmitter of the embodiment of the invention constitutes with integrated circuit NE571, the auspicious＜A of its output〉receive Fig. 8 the dual signal blender＜A hold.
As Fig. 7, the Broadcast Control order generator of the wireless centrex signal of telecommunication transmitter of the embodiment of the invention constitutes with integrated circuit T7907, and its Broadcast Control order is by＜C〉end export to Fig. 8 encoder＜C end.
As Fig. 8, the encoder of the wireless centrex signal of telecommunication transmitter of the embodiment of the invention, coded data signal modulator, dual signal blender constitute the output＜D of its dual signal blender with integrated circuit LM324 and LM567〉receive the f of Fig. 9
0Input＜the D of rf modulations and radio-frequency (RF) power amplification circuit 〉.
As Fig. 9, the f of the wireless centrex signal of telecommunication transmitter of the embodiment of the invention
0Rf modulations and radio-frequency (RF) power amplification circuit are made of transistor 9018,2G711,3DA21,2SC1926 and electronic component, and exchange power circuit has simultaneously drawn among Fig. 9.
As Figure 10, the radio microphone transmitter of the embodiment of the invention adopts wireless system, its emitting head output is antenna, and the low frequency signal processor is made of integrated circuit NE571, its output＜A '〉receive the input＜A ' of the signal mixing switch of Figure 11 〉.
As Figure 11, the 1KHz signal generator of the radio microphone transmitter of the embodiment of the invention, volume/switch clutch, 1KHz signal amplitude controller and signal mixing switch are made of integrated circuit LM358 and transistor circuit, 22K Ω potentiometer W is used for regulating volume, it and K switch interlock, the output＜B of signal mixing switch〉receive input＜B of Figure 12 〉.
As Figure 12, it is to utilize the connecting line of receiving mini microphone to constitute that the radio microphone transmitter of the embodiment of the invention adopts radio modulator, wireless transmission antenna, i.e. radio-frequency (RF) power amplification output＜D〉receive the mini microphone lead-in wire＜D of Figure 10〉hold.
As Figure 13, the high-frequency signal processor of the band address binary channels power amplifier receiver of the embodiment of the invention, the binary channels separator, the demodulated data signal device, the low frequency signal processor is made of integrated circuit SONY-DXA1191MP and integrated circuit NE571 and NE565, output＜the A of demodulated data signal device〉receive input＜A of Figure 14 〉, output＜the B of low frequency signal processor〉receive input＜B of Figure 16 〉, output＜the C of the phase-locked loop in the demodulated data signal device〉by input＜C〉to Figure 14, input＜the E of noise elimination mute circuit〉receive output＜E of Figure 14 〉, the output＜F of the high frequency phase locked loop in the high-frequency signal processor〉receive input＜F of Figure 16 〉.
As Figure 14, the gating command decoder of the band address binary channels power amplifier receiver of the embodiment of the invention, this machine address DIP device, the center logic controller, the low frequency signal switch, the gating beep generator is by integrated circuit MC145436 and CD4022, CD4099, CD4069, CD4075, two CD4043,5 CD4081 and 4 CD4063 constitute, output＜the F of center logic controller〉receive Figure 15＜F the end, output＜the K of gating prompting shape device〉receive Figure 16＜K end, output＜the L of Strobe Controller〉receive Figure 15＜L, the output＜E of gating command decoder〉receive Figure 13 and Figure 16＜E the end.
As Figure 15, the wireless receiving head of the band address binary channels power amplifier receiver of the embodiment of the invention, the wireless signal demodulation processor, the low frequency signal processor, this machine self-locking flip and flop generator, self-locking time-delay logic, the prompt tone buzzer is by integrated circuit SONY-CXA1191M/P, NE567, CD4040, CD4011 and NE571 constitute, output＜the G of high-frequency signal processor〉receive Figure 16＜G, output＜the H of this machine self-locking flip and flop generator〉receive Figure 14＜H, the output＜I of the high frequency phase locked loop in the high-frequency signal processor〉receive Figure 16＜I.
As Figure 16, this machine dual track power amplifier of the band address binary channels power amplifier receiver of the embodiment of the invention, positioning indicator, power amplifier soft initiator are made of integrated circuit AN7188NK and transistor 9014,9015.
As Figure 17, the high-frequency signal processor of the radio voice paging machine of the embodiment of the invention, low frequency signal processor, data signal modulation device are made of integrated circuit SONY-CXA1191M/P and integrated circuit NE565 and NE571.
As Figure 18, the embodiment of the invention the gating command decoder, this machine address DIP device, geocoding comparator, gating of radio voice paging machine drive and beep generator is made of integrated circuit MC145436, CD4022, CD4514, CD4043, CD4069, CD4075 and 4 CD4081.
As Figure 19, the 30 seconds digital speech memories and the positioning indicator of the radio voice paging machine of the embodiment of the invention are made of integrated circuit TMS3477A and HM511000C.
The language format of the embodiment of the invention and method of operation such as following table: kind target effect operation key name and order 1 all gating A2 all cancel cancellation # (1) (2) the single gating # of B*5 (1) (2) (3) (4) C# 6 single cancellation # (1) (2) (3) (4) C* of the gating # of D3 colony (1) (2) B# 4 colony
Annotate: (1) (2) (3) (4) are 0～9 10 system numerals (coding is used).
#-changes beginning and the order of registration gating over to
B-colony
*-single and colony's mandatum cassatorium
C-is single
The explanation of aforesaid operations method:
1. on the telephone key of wireless centrex signal of telecommunication transmitter panel, operate.
2. the order of various operation species is not limit.
3. the order of every kind of operation must be by the formal definition operation in tandem.
4. divide colony from line number with (1) (2), (3) (4) are distinguished single.
5.A, D two command keys are all at all, careful operation, in order to avoid input by mistake.
6. meeting " 0 " when operating must not omit, otherwise makes mistakes.
Example: " just class " one by one, numbering is 0101, can not mistake be input as #11C#, correct format should be " #0101C# " (registration) or " #0101C* " (cancellation).
7. when doing gating or cancellation input operation, exchange should broadcast some vocal musics of releiving but not percussion music as far as possible, has so just avoided the interference of main signal to gating signal as much as possible, makes operation more smooth.Each bar incoming level control knob places minimum position then better.
The present invention has following advantage:
1. the present invention is delivered to multiline message same at one time Receiver is processed, and each other also can be according to field condition Control does not affect listening to of other audiences respectively, can carry out public Broadcasting can be carried out gating or cancellation to object pleasant to hear again, very suits Electronic teaching field or other similar field user's needs.
2. the volume potentiometer switch on the native system radio microphone emitter Can be used for the locking merit of remote control band address binary channels power amplifier receiver Can, making the exchange Signal Fail of this receiver of gating, receiver is accepted The handoff command of radio microphone emitter is until the radio microphone emitter Shutdown, receiver resets, and therefore regulates volume and utters long and high-pitched sounds with the elimination self-excitation Sound easily.
3. band of the present invention address binary channels power amplifier receiver has start Zero clearing and gating memory function are namely ordered as long as cancel behind the gating Order, after the radio microphone transmitter-off resets receiver, this choosing Logical instruction is not eliminated, and will work immediately, makes receiver automatic Connect the exchange signal.
4. radio voice paging facility of the present invention have the stored digital merit Can, front 30 seconds when gating information received in record automatically (when needing Extend to 128 seconds) interior language information, and corresponding finger is arranged Show the lamp prompting. After pressing extraction button (PLAY key), namely Can hear the content of notifying from a phone call, at this moment machine is in again standby shape Attitude.
5. in two kinds of receivers of the present invention a small-sized buzzing is housed all Device after the receiver of this numbering is by the exchange gating, all can hear one The sound prompt tone.
6. band of the present invention address binary channels power amplifier receiver has soft opening Movement controller, when exchange and radio microphone emitter are all closed, profit Make the dump of power amplification circuit with logic circuit, to reduce merit Consumption is eliminated noise, prevents that integrated circuit is overheated and damages.
7. the product of producing according to the present invention program, with low cost, every Cover only needs hundreds of units; But two kinds of receivers and radio microphone emitter root Increase many covers according to needs, the at this moment certain corresponding increase of expense some, but Also far below current commercially available simple function equipment.
8. as required, the present invention can increase the language encryption/decryption circuit as the A point of Fig. 2, Fig. 3 and the B point place of Fig. 4, Fig. 5 at the suitable point of circuit, so that system needing to be used for secret language wireless transmission.
Claims (8)
1, a kind of digital selecting-pass radio microphone aid system for electrical teaching, be made up of wireless centrex signal of telecommunication transmitter (1), radio microphone transmitter (2), band address binary channels power amplifier receiver (3), radio voice paging machine (4) and Broadcast Control order generator (5), it is characterized in that: wireless centrex signal of telecommunication transmitter (1) had both been launched and had been modulated that the frequency of input signal is arranged is f
0Radiofrequency signal, another when utilizing the modulation of its high-frequency signal again independently radio multiplex broadcasting channel transmits the signal that has numerically coded instruction and address; Radio microphone transmitter (2) becomes voice signal the modulation signal of selected wireless transmission medium and launches by emitting head (15); The radiofrequency signal of wireless centrex signal of telecommunication transmitter (1) is received by band address binary channels power amplifier receiver (3) and radio voice paging machine (4), and band address binary channels power amplifier receiver (3) also receives the letter of radio microphone transmitter (2) by wireless receiving head (19); Broadcast Control order generator (5) links to each other with wireless centrex signal of telecommunication transmitter (1).
2, digital selecting-pass radio microphone aid system for electrical teaching according to claim 1, tool is characterised in that: wireless centrex signal of telecommunication transmitter (1) is by microphone voice signal and line signal input, low frequency signal processor (6), encoder (8) coded data signal modulator (9), dual signal blender (7), f
0Rf modulations and radio-frequency (RF) power amplification circuit (10) are formed, voice signal and line signal are received the input of low frequency signal processor (6), dual signal blender 7 is received in the output of low frequency signal processor (6): on the other hand, the signal of Broadcast Control order generator (5) is input to encoder (8), the signal of encoder (8) outputs to coded data signal modulator (9), and the output of coded data signal modulator (9) is also received dual signal blender (7); Dual signal blender (7) will output to f after will mixing from the signal of low frequency signal processor (6) and coded data signal modulator (9)
0Rf modulations and radio-frequency (RF) power amplification circuit (10), last, f
0Rf modulations and radio-frequency (RF) power amplification circuit (10) are launched radio wave by antenna.
3, digital selecting-pass radio microphone aid system for electrical teaching according to claim 1, it is characterized in that: radio microphone transmitter (2) is made up of low frequency signal processor (12), signal mixing switch (13), 1KHz signal generator (16), volume/switch gearing device (17), 1KHz signal amplitude controller (18), wireless modem (14) and wireless transmission head (15), audio signal is received the input of low frequency signal processor (12), and signal mixing switch (13) is received in the output of low frequency signal processor (12); On the other hand, 1KHz signal generator (16) is delivered to 1KHz signal amplitude controller (18) by volume switch clutch (17) with signal, the output of 1KHz signal amplitude controller (13) is also received the output of signal mixing switch (13) signal mixing switch (13) and is received wireless modem (14), after wireless modem (14) is modulated signal, send wireless signal transmission by wireless transmission head (15).
4, digital selecting-pass radio microphone aid system for electrical teaching according to claim 1, it is characterized in that: band address binary channels power amplifier receiver (3) is by wireless receiving head (19), wireless signal demodulation processor (20), high-frequency signal is handled and binary channels split circuit (24), low frequency signal processor (21), low frequency signal processor (25), this machine self-locking flip and flop generator (22), self-locking time-delay logical circuit (23), low frequency signal switch and center logic controller (26), digital gating channel demodulator (28), gating command decoder (29), geocoding comparator (30), this machine address DIP device (32), this machine gating beep generator one positioning indicator-power amplifier soft initiator (31) and dual track power amplifier (27) are formed, band address binary channels power amplifier receiver (3) has two receiving terminals, one is the wireless receiving head (19) that receives the transmitted wave of radio microphone transmitter (2), one is the radio frequency reception antenna that receives the public broadcasting radio wave, wireless signal demodulation processor (20) is received in the output of wireless receiving head (19), low frequency signal processor (21) is received in the output of wireless signal demodulation processor (20), two outputs of low frequency signal processor (21), one terminates to low frequency signal switch and center logic controller (26), the other end is received self-locking time-delay logical circuit (23), this machine self-locking flip and flop generator (22) is received in the output of self-locking time-delay logical circuit (23), and low frequency signal switch and center logic controller (26) are received in the output of this machine self-locking flip and flop generator (22); On the other hand, the f that receives from antenna
0High-frequency signal is input to high-frequency signal and handles and binary channels split circuit (24), two output channels of binary channels split circuit (24), one is the main signal channel of output public broadcasting information, it receives low frequency signal processor (25), another is exactly to be modulated on a certain frequency subcarriers and with the passage of the digital gating signal of certain rule coding, it receives digital gating channel demodulator (28), gating command decoder (29) is received in the output of digital gating channel demodulator (28), geocoding comparator (30) is received in the decoded output of gating command decoder (29), result after the output that a yard device (32) is pulled out in decoded result and this machine address compares divides two-way output by geocoding comparator (30), one the tunnel receives this machine gating beep generator-positioning indicator-power amplifier soft initiator (31), low frequency signal switch and center logic controller (26) are received in another road, low frequency signal switch and center logic controller (26) are also received in the output of low frequency signal processor (25), at last, the output of center logic controller (26) is received binary channels power amplifier (27).
5, digital selecting-pass radio microphone aid system for electrical teaching according to claim 1 is characterized in that: radio voice paging machine (4) buries device (33) by the high-frequency signal place, low frequency signal processor (34), demodulated data signal device (36), gating command decoder (37), this machine address DIP device (39)), geocoding comparator (40), gating drives and beep generator (41), 30 seconds digital speech memories and positioning indicator (38), the output that band is formed high-frequency signal processor (33) by the low-power audio amplifier (35) of end is received low frequency signal processor (34) and demodulated data signal device (36).The output of demodulated data signal device (36) is received gating command decoder (37), the output one of gating command decoder (37) terminates to geocoding comparator (40), the other end is received 30 seconds digital speech memories and positioning indicator (38), geocoding comparator (40) is received in the output of this machine address scrambler (39), the output of geocoding comparator (40) is received gating and driven and beep generator (41), and is last.Gating drive and the output of the output of beep generator (41) and low frequency signal processor (34) and 30 seconds the digital speech memory (38) output all receive the low-power audio amplifier (35) of band by end.
6, radio microphone transmitter according to claim 3 (2) is characterized in that: radio microphone transmitter (2) can be a radio type, also can be infrared ray or ultrasound in nature.
7, radio microphone transmitter according to claim 3 (2) is characterized in that: have the potentiometer W that is used for regulating volume in the low frequency signal processor (12).
8, wireless centrex signal of telecommunication transmitter according to claim 2 (1) is characterized in that: speech signal is f for the frequency of wireless centrex signal of telecommunication transmitter (1)
0The modulation system of radiofrequency signal, both can be mode of frequency regulation, also can be amplitude modulation or pm mode; Coded system in order to transmission digital gating instruction address code signal can be any digital information transmission mode that is easy to discern; Mode in order to the passage that transmits this code signal, both can be SCA (frequency modulation sub-broadcast) mode, also can be to adopt one of the mode of an autonomous channel of generation under the orthogonal balanced modulation system or multichannel modes of other usefulness radio multiplex broadcasting technology realizations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96118042A CN1046068C (en) | 1996-02-06 | 1996-02-06 | Digital gating audio-visual teaching wireless sound transmission and aid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96118042A CN1046068C (en) | 1996-02-06 | 1996-02-06 | Digital gating audio-visual teaching wireless sound transmission and aid system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1166096A CN1166096A (en) | 1997-11-26 |
| CN1046068C true CN1046068C (en) | 1999-10-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96118042A Expired - Fee Related CN1046068C (en) | 1996-02-06 | 1996-02-06 | Digital gating audio-visual teaching wireless sound transmission and aid system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1046068C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047408B (en) * | 2006-03-31 | 2010-06-30 | 中国科学院声学研究所 | A digital wireless microphone system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210431U (en) * | 1986-12-18 | 1987-09-23 | 西南林学院 | Multifunctional audio-visual teaching system with computer |
-
1996
- 1996-02-06 CN CN96118042A patent/CN1046068C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210431U (en) * | 1986-12-18 | 1987-09-23 | 西南林学院 | Multifunctional audio-visual teaching system with computer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1166096A (en) | 1997-11-26 |
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