CN2335331Y - Infrared ray microphone device - Google Patents
Infrared ray microphone device Download PDFInfo
- Publication number
- CN2335331Y CN2335331Y CN 97241895 CN97241895U CN2335331Y CN 2335331 Y CN2335331 Y CN 2335331Y CN 97241895 CN97241895 CN 97241895 CN 97241895 U CN97241895 U CN 97241895U CN 2335331 Y CN2335331 Y CN 2335331Y
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- China
- Prior art keywords
- signal
- transistor
- amplifying circuit
- infrared ray
- pin
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a microphone device with an infrared ray, comprising a pick-up 1, a signal modulating and amplifying circuit 4, a signal emitter 2, a signal receiver 3 and a signal recovering and amplifying circuit 5, wherein, the signal emitter 2 is an infrared luminous tube; the signal receiver is a light-sensitive device; the pick-up is connected with the signal emitter 2 via the signal modulating and amplifying circuit 4; the signal receiver 3 is connected with the signal recovering and amplifying circuit 5; the infrared luminous tube converts an electric signal into an optical signal, and transmits the optical signal to space; the light-sensitive device receives the optical signal to convert the optical signal into the electric signal to transmit the electric signal to the signal recovering and amplifying circuit 5.
Description
The utility model relates to a kind of transmission system of utilizing radio wave electromagnetic wave in addition by free space, particularly a kind of infrared ray microphone device.
The signal of cordless handset of the prior art adopts radio wave to transmit, and this microphone has lot of advantages, long transmission distance for example, and it is strong to penetrate the barrier ability, and signal is difficult for decay etc.But also bring the some shortcomings part: can not use the cordless handset system independently each other more than two or two in certain zone simultaneously, otherwise can interfere with each other because of these advantages.Like this, cause cordless handset can't be applied in the occasion that people press for, for example: family expenses and Karaoke public place of entertainment.And, use this cordless handset also can pollute the radio space in a large number.
The purpose of this utility model is to overcome weak point of the prior art, and a kind of radio space of not polluting is provided, and is difficult for the infrared microphone device of phase mutual interference.
The purpose of this utility model realizes by following approach.
The infrared ray microphone device, comprise pick-up, signal modulation and amplifying circuit, signal projector, signal receiver and signal reduction and amplifying circuit, signal modulation and amplifying circuit are plugged between pick-up and the signal projector, signal receiver then is electrically connected with signal reduction and amplifying circuit, it forms main points: signal projector is a kind of infraluminescence pipe, signal receiver is a kind of light-sensitive device, the infraluminescence pipe is a light signal and to space transmission with electrical signal conversion, and light-sensitive device receives this light signal and is converted to the signal of telecommunication and passes to signal reduction and amplifying circuit again.
The purpose of this utility model can also notify following approach to realize.
Light-sensitive device or a kind of photodiode, or a kind of phototriode.
Infraluminescence pipe or a kind of light-emitting diode, or a kind of semiconductor laser diode.
Include a kind of high frequency preemphasis processor in signal modulation and the amplifying circuit, include a kind of high frequency processor that postemphasises in signal reduction and the amplifying circuit, high frequency preemphasis processor promotes processing and amplifying to the high-frequency signal in the signal to be transmitted, and the high frequency high-frequency signal of processor in to received signal that postemphasis carries out attenuation processing.
In the infrared light transmission signal process, to the decling phase of high-frequency signal to more obvious.Above-mentioned processing mode can improve the microphone fidelity.
Signal modulation and amplifying circuit also comprises transistor amplifier circuit and be the modulator of LM567 conduct by model, transistor base in the transistor amplifier circuit is connected with pick-up, grounded emitter, collector electrode is connected with " 2 " pin among the LM567, the signal output pin " 5 " of LM567 is connected with photodiode, high frequency preemphasis processor is made up of the negative feedback resistor and the shunt capacitance in parallel with negative feedback resistor that are connected between transistor base and the emitter, high-frequency signal passes through from shunt capacitance, thereby reduces negative feedback and increased the weight of.
Signal reduction and amplifying circuit also comprise demodulator and transistor amplifier circuit, demodulator is included in the chip that model is LM567, the collector electrode of phototriode is connected with " 3 " pin of LM567, and " 2 " pin of LM567 is connected with transistor base in the transistor amplifier circuit by resistance as audio signal output end, emitter ground connection, collector electrode is then as the signal output part of signal reduction and amplifying circuit, high frequency postemphasises processor by resistance and an end ground connection, the shunt capacitance of the other end and resistance is formed, with a part of high-frequency signal in the audio signal of LM567 " 2 " pin output from shunt capacitance by and filtered.
Also include comparator and electronic switch, two inputs of comparator reduce with signal receiver and signal respectively and amplifying circuit is electrically connected, its signal output part then is connected with electronic switch, received signal is sent in the comparator as sampled signal, compare with the local oscillation signal that signal reduces and amplifying circuit produced, when consistent or error is in prescribed limit when the frequency of two signals, comparator is exported signal of telecommunication control electronic switch open circuit and is allowed to pass to sound amplifier after the audio signal, during inconsistent and error overshoot scope, comparator is exported signal of telecommunication control electronic switch to pass after audio signal when the frequency of two signals.
Comparator is included among the LM567, electronic switch is a kind of transistor switching circuit, transistorized collector electrode in reduction of transistor collector wherein and signal and the amplifying circuit is connected, and this emitter ground connection, and base stage is connected with " 8 " pin of LM567, when LM567 exports normal audio signal, " 8 " pin provides an electronegative potential, and transistor is cut-off state, when LM567 output interference audio signal, " 8 " pin provides a high potential, and transistor is saturation condition.
In sum, the utility model has following advantage compared to existing technology, do not pollute the radio space, infrared signal can be confined in the enclosure space (for example every house in) and not understand outer other space that reaches, therefore, can not produce the infrared ray microphone device in other enclosure space of neighbour and disturb, therefore, the utility model is particularly suitable for family expenses or use the Karaoke public place of entertainment.
Accompanying drawing 1 is the block diagram of the utility model most preferred embodiment.
Accompanying drawing 2 is circuit diagrams of infrared ray microphone device signal emission forward part described in the utility model.
Accompanying drawing 3 is circuit diagrams that infrared ray microphone device signal described in the utility model receives the rear section.
Below we carry out more detailed description to the utility model in conjunction with the accompanying drawings.Most preferred embodiment:
With reference to accompanying drawing 1, the infrared ray microphone device comprises modulation of pick-up 1, signal and amplifying circuit 4, signal projector 2, signal receiver 3, signal reduction and amplifying circuit 5, comparator 7, high frequency preemphasis processor 41, high frequency postemphasis processor 51 and electronic switch 6.Signal modulation and amplifying circuit 4 are plugged between pick-up 1 and the signal projector 2; 3 two outputs of signal receiver are connected with signal reduction and amplifying circuit 5 and comparator 7 respectively, two outputs of signal reduction and amplifying circuit 5 then are connected with comparator 7 and electronic switch 6 respectively, and comparator 7 signal output parts also are connected with electronic switch.
With reference to accompanying drawing 2 and accompanying drawing 3, signal modulation and amplifying circuit 4 comprise transistor amplifier circuit, by model is modulator, high frequency preemphasis processor 41 and the amplification driving circuit of LM567 conduct, and high frequency preemphasis processor 41 is made up of negative feedback resistor R1 and the bypass circuit C1 in parallel with R1; Amplification driving circuit comprises transistor Q1.Transistor Q2 base stage in the transistor amplifier circuit is connected with pick-up 1, its emitter is by ground connection behind the negative feedback resistor R1, collector electrode is connected with " 2 " pin among the LM567, the signal output pin " 5 " of LM567 is connected with the base stage of transistor Q1, the grounded emitter of transistor Q1, collector electrode is connected with photodiode D1, the D2 of two series connection, and here, photodiode D1, D2 are as signal projector 2.Signal receiver 3 is a kind of phototriodes.Signal reduction and amplifying circuit 5 comprise demodulator, transistor amplifier circuit and the high frequency processor 51 that postemphasises, and comparator 7 and demodulator all are included in the chip that model is LM567, and the high frequency processor 51 that postemphasises is made up of resistance R 2 and capacitor C 2.The collector electrode of phototriode is connected with the input of operational amplifier LM358, the output of LM358 then is connected with " 3 " pin of LM567, " 2 " pin of LM567 be divided into two the tunnel after resistance R 2 is connected, one the tunnel is connected with the base stage of transistor Q3 in the transistor amplifier circuit, and another road is then by ground connection behind the shunt capacitance C2.The grounded emitter of transistor Q3, collector electrode are connected with the collector electrode of transistor Q4 and as the signal output part of this microphone device.The base stage of transistor Q4 is connected with " 8 " pin of LM567, and its grounded emitter.
The audio signal that pick-up 1 is picked up is amplified signal through transistor amplifier circuit, because the shunt capacitance C1 in the high frequency preemphasis processor provides path to high-frequency signal, like this, the negative feedback of high-frequency signal reduces, and is increased the weight of; After being modulated into frequency-modulated wave behind the LM567 and being exaggerated the drive circuit amplification, remove to drive photodiode through the audio signal behind amplification, the preemphasis high frequency and send pulsed optical signals to the space; Phototriode receives this pulsed optical signals and is converted to the signal of telecommunication and sends into and enter the LM567 demodulation again after the LM358 computing is amplified and be reduced into audio signal, from " 2 " pin output of LM567.Because capacitor C 2 provides path according to the working point that resistance R 2 sets to a part of high-frequency signal, make high-frequency signal be attenuated and postemphasis, signal after postemphasising enters the base stage of the transistor Q3 in the transistor amplifier circuit, exports from collector electrode after amplifying.Because the collector electrode of transistor Q3 is connected with the collector electrode of transistor Q4 in the electronic switch 6, therefore, whether the signal that comes out from transistor Q3 collector electrode is output the break-make that depends on electronic switch 6, when the LM567 demodulation restores audio signal and fail outside " 2 " pin, as comparator 7 through confirming that relatively this audio signal is a normal signal, then allow " 8 " pin of LM567 provide an electronegative potential simultaneously, transistor Q4 is operated in cut-off state, reaches sound amplifier after the audio signal of coming out from transistor Q3 gets; As comparator 7 through confirming that relatively this audio signal is an interference signal, then allow " 8 " pin of LM567 provide a high potential simultaneously, transistor Q4 is operated in the full state that closes, the signal that comes out from transistor Q3 through transistor Q4 bypass by and can't outside fail, thereby the back biography of the noise that other light signal that has prevented to sense because of phototriode causes.
It is same as the prior art that present embodiment is not stated part.
Claims (8)
1. infrared ray microphone device, comprise pick-up (1), signal modulation and amplifying circuit (4), signal projector (2), signal receiver (3) and signal reduction and amplifying circuit (5), signal modulation and amplifying circuit (4) are plugged between pick-up (1) and the signal projector (2), signal receiver (3) then is electrically connected with signal reduction and amplifying circuit (5), it is characterized in that, signal projector (2) is a kind of infraluminescence pipe, signal receiver (3) is a kind of light-sensitive device, the infraluminescence pipe is a light signal and to space transmission with electrical signal conversion, and light-sensitive device receives this light signal and is converted to the signal of telecommunication and passes to signal reduction and amplifying circuit (5) again.
2. infrared ray microphone device according to claim 1 is characterized in that, light-sensitive device or a kind of photodiode, or a kind of phototriode.
3. infrared ray microphone device according to claim 1 is characterized in that, infraluminescence pipe or a kind of light-emitting diode, or a kind of semiconductor laser diode.
4. infrared ray microphone device according to claim 1, it is characterized in that, include a kind of high frequency preemphasis processor (41) in signal modulation and the amplifying circuit (4), include a kind of high frequency processor (51) that postemphasises in signal reduction and the amplifying circuit (5), high frequency preemphasis processor (41) promotes processing and amplifying to the high-frequency signal in the signal to be transmitted, and the high frequency high-frequency signal of processor (51) in to received signal that postemphasis carries out attenuation processing.
5. infrared ray microphone device according to claim 4, it is characterized in that, signal modulation and amplifying circuit also comprises transistor amplifier circuit and be the modulator of LM567 conduct by model, transistor in the transistor amplifier circuit (2) base stage is connected with pick-up, grounded emitter, collector electrode is connected with " 2 " pin among the LM567, the signal output pin " 5 " of LM567 is connected with photodiode, high frequency preemphasis processor (41) is formed by being connected negative feedback resistor (R1) between transistor (Q2) base stage and the emitter and the shunt capacitance (C1) in parallel with negative feedback resistor (R1), high-frequency signal passes through from shunt capacitance (C1), thereby reduces negative feedback and increased the weight of.
6. infrared ray microphone device according to claim 4, it is characterized in that, signal reduction and amplifying circuit (5) also comprise by model being the demodulator and the transistor amplifier circuit of LM567 conduct, the collector electrode of phototriode is connected with " 3 " pin of LM567, and " 2 " pin of LM567 is connected with transistor (Q3) base stage in the transistor amplifier circuit by resistance (R2) as audio signal output end, transistor (Q3) grounded emitter, collector electrode is then as the signal output part of signal reduction and amplifying circuit, high frequency postemphasises processor (51) by resistance (R2) and an end ground connection, shunt capacitance (C2) that the other end is connected with resistance (R2) is formed, a part of high-frequency signal in the audio signal of LM567 " 2 " pin output from shunt capacitance (C2) by and filtered.
7. infrared ray microphone device according to claim 1, it is characterized in that, also include comparator (7) and electronic switch (6), (7) two inputs of comparator reduce with signal receiver (3) and signal respectively and amplifying circuit (5) is electrically connected, its signal output part then is connected with electronic switch (6), received signal is sent in the comparator (7) as sampled signal, the local oscillation signal that is produced with signal reduction and amplifying circuit (5) compares, when consistent or error is in prescribed limit when the frequency of two signals, comparator (7) output one signal of telecommunication control electronic switch (6) is opened a way and is allowed to pass to sound amplifier after the audio signal, during inconsistent and error overshoot scope, comparator (7) output one signal of telecommunication control electronic switch (6) is to pass after audio signal when the frequency of two signals.
8. infrared ray microphone device according to claim 5, it is characterized in that, comparator (7) is included among the LM567, electronic switch (6) is a kind of transistor switching circuit, transistor wherein (Q4) collector electrode is connected with the collector electrode of transistor (Q3), transistor (Q4) grounded emitter, base stage is connected with " 8 " pin of LM567, when LM567 exports normal audio signal, " 8 " pin provides an electronegative potential, and transistor (Q4) is cut-off state, when LM567 output interference audio signal, " 8 " pin provides a high potential, and transistor (Q4) is saturation condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97241895 CN2335331Y (en) | 1997-10-15 | 1997-10-15 | Infrared ray microphone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97241895 CN2335331Y (en) | 1997-10-15 | 1997-10-15 | Infrared ray microphone device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2335331Y true CN2335331Y (en) | 1999-08-25 |
Family
ID=33951261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97241895 Expired - Fee Related CN2335331Y (en) | 1997-10-15 | 1997-10-15 | Infrared ray microphone device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2335331Y (en) |
-
1997
- 1997-10-15 CN CN 97241895 patent/CN2335331Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |