CN106888306A

CN106888306A - A kind of simulated voice handle for testing

Info

Publication number: CN106888306A
Application number: CN201710198261.2A
Authority: CN
Inventors: 梁俊杰; 郭秋明; 许兵; 邢庆瑶
Original assignee: YANTAI NORTHERN STARRY SKY AUTOMATIC CONTROL TECHNOLOGY Co Ltd
Current assignee: YANTAI NORTHERN STARRY SKY AUTOMATIC CONTROL TECHNOLOGY Co Ltd
Priority date: 2017-03-29
Filing date: 2017-03-29
Publication date: 2017-06-23
Anticipated expiration: 2037-03-29
Also published as: CN106888306B

Abstract

The invention discloses a kind of simulated voice handle for testing, including：Voice encoding/decoding chip, permalloy audio-frequency transformer, T-shaped attenuator and optocoupler, are provided with two groups of transformers in permalloy audio-frequency transformer, impedance is respectively 150:150、600:600, two groups of inputs of transformer respectively have a terminal welding system ground；Output end respectively has a terminal with answering sound handle, and ungrounded end is respectively MIC, PHONE lead；Speech handle ground and systematically between pass through capacitance connection；T-shaped attenuator includes resistance R1, R2 and R3, the first end of resistance R2 connects the AO ends of voice encoding/decoding chip, second end of resistance R2 connects the first end of resistance R1, R3, the second end ground connection of resistance R3, in the second end connection permalloy audio-frequency transformer of resistance R1 150 respectively:The ungrounded end of 150 transformer inputs, in permalloy audio-frequency transformer 600:The ungrounded end of 600 transformer inputs is then connected to the AI ends of voice encoding/decoding chip；One output end of optocoupler is PTT leads.

Description

A kind of simulated voice handle for testing

Technical field

The present invention relates to Speech Communication control class product, test class product, more particularly to a kind of simulation words for testing Sound handle.

Background technology

Speech handle is the electrophone equipment used for backpack or vehicular coordinative composition of equipments, with send words, it is called, The functions such as PTT.Speech handle uses passive design mostly, the circuits such as feed, signal condition is designed with equipment end, to speech hand Handle is powered filtering, enhanced processing with voice signal.Currently, for speech handle interface test and use, mostly also It is to test the quality of handle interface by the way of people propagandas directed to communicate to microphone, there is no preferable automatic test and simulation meanses. Lightness with various types of vehicles develops, and in-car space diminishes, and the miniaturization of equipment, integrated has turned into development trend, original An in-car equipment connects a situation for speech handle will not exist yet, and more is to use 1 speech handle by certain Mechanism simultaneously connect multiple equipment.

But at present, when speaking test or a speech handle connection multiple equipment is carried out, there is no effective replacement words The technological means of sound handle.

The content of the invention

The deficiency that the present invention exists for above-mentioned prior art, there is provided a kind of simulated voice handle for testing, to obtain Well audio is really.

The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of simulated voice handle for testing, including： Voice encoding/decoding chip, permalloy audio-frequency transformer, T-shaped attenuator and optocoupler, wherein, the permalloy audio transformation Two groups of transformers are provided with device, impedance is respectively 150:150、600:600, two groups of inputs of transformer respectively have a terminal to connect Systematically GND, ungrounded end connects the voice encoding/decoding chip, the T-shaped attenuator respectively；Output end then respectively has an end Son answer sound handle ground AGND, ungrounded end is respectively MIC leads, PHONE leads；The speech handle ground AGND and the system It is attached by electric capacity C1 between system ground GND；The T-shaped attenuator includes resistance R1, R2 and R3, wherein, the of resistance R2 One end connects the AO ends of the voice encoding/decoding chip, and second end of resistance R2 connects the first end of resistance R1, R3, resistance respectively The second end ground connection of R3, in the second end connection permalloy audio-frequency transformer of resistance R1 150:150 transformers are input into The ungrounded end at end, in the permalloy audio-frequency transformer 600:The ungrounded end of 600 transformer inputs then connects To the AI ends of the voice encoding/decoding chip；The optocoupler has two inputs, and one of input connection control IO is another Individual input is connected to+3.3V power supplys by a resistance, and the optocoupler also has two output ends, and one of output end is speech The PTT signal leads of handle, another output end connection speech handle ground AGND.

On the basis of above-mentioned technical proposal, the present invention can also do following improvement.

Preferably, described resistance R1, R2 are 147 Ω, and R3 is 3 Ω.

Preferably, the electric capacity C1 is 100uF.

Preferably, another input of the optocoupler is connected to+3.3V power supplys by the resistance that resistance is 510 Ω.

Preferably, the optocoupler is MOSFET output photoelectric couplers AQW210.

Simulated voice handle for testing of the invention devises T-shaped decay in the output end of voice encoding/decoding chip Device, impedance matching and sound attenuating are carried out to speech, and the transformer of permalloy is employed to audio-type in the rear end of attenuator Number isolated, using the key switch of the PTT of MOSFET output photoelectric coupler circuit simulated voice handles, closure, thus Obtain it is good if audio really.

Brief description of the drawings

Fig. 1 is the structural representation of the simulated voice handle for testing of the invention；

In the accompanying drawings, the list of designations represented by each label is as follows：

100 voice encoding/decoding chips

200 permalloy audio-frequency transformers

300 T-shaped attenuators

400 optocouplers

Specific embodiment

Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and It is non-for limiting the scope of the present invention.

Please also refer to shown in Fig. 1, it is the structural representation of the simulated voice handle for testing of the invention.The words Sound handle includes：Voice encoding/decoding chip (DAC chip) 100, permalloy audio-frequency transformer 200, T-shaped attenuator 300 and Optocoupler 400, wherein,

Two groups of transformers are provided with the permalloy audio-frequency transformer 200, impedance is respectively 150:150、600:600, Two groups of inputs of transformer respectively have a terminal welding system ground GND, and ungrounded end connects the voice encoding/decoding chip respectively 100th, the T-shaped attenuator 300；Output end then respectively has a terminal with answering sound handle AGND, and ungrounded end is respectively MIC (microphone, microphone) lead, PHONE (earphone, receiver) lead；

The T-shaped attenuator 300 includes resistance R1, R2 and R3, wherein, the first end of resistance R2 connects the speech and compiles solution The AO ends of code chip 100, second end of resistance R2 connects the first end of resistance R1, R3, the second end ground connection of resistance R3, electricity respectively In the second end connection permalloy audio-frequency transformer 200 of resistance R1 150:The ungrounded end of 150 transformer inputs, institute State 600 in permalloy audio-frequency transformer 200:The ungrounded end of 600 transformer inputs is then connected to the speech and compiles The AI ends of decoding chip 100；In general, the words sensitivity of sending of speech handle is 1mV/Pa, and voice encoding/decoding chip is exported Level be much larger than this value, if the output signal at its AO end is directly connected with equipment, it will generation is very big to make an uproar Sound；And after adding T-shaped attenuator in circuit by sound attenuating, impedance matching, then can receive it is good if audio really；This hair The bright AO output end connecting T-shaped attenuators in voice encoding/decoding chip, decay speech 40dB, due to typical case's input of speech handle Impedance is 150 Ω, therefore corresponding resistance representative value R1, the R2 of attenuator is 147 Ω, and R3 is 3 Ω, but is not limited.

Receiving, sending words frequency range for speech handle is 200Hz~4000Hz, and common transformer is isolated under this frequency Effect is poor, and voice distortion is serious after isolation；Thus, it is desirable to be isolated using permalloy audio-frequency transformer.Speech hand Handle ground AGND and systematically it is attached by electric capacity C1 between GND, the representative value of electric capacity C1 is 100uF.This Isolation Mode, that is, ensure that normal Speech Communication, and can effectively eliminate that multiple devices connect and bring again interacts, The noise that elimination is mutually coupled and produces, with well audio really.

The optocoupler 400 has two inputs, and one of input connection control IO, another input is electric by one Resistance is connected to+3.3V power supplys, and the resistance is preferably 510 Ω；The optocoupler 400 has two output ends, and one of output end is The PTT signal leads of speech handle, another output end connection speech handle ground AGND.When it is high level to control IO, PTT letters Number be vacant state；When it is low level to control IO, PTT signals are connected with AGND, reach and control simulation PTT to open by IO The effect closed, close.Thus, the simulated voice handle for testing of the invention has four leads：MIC, speech handle ground AGND, PHONE and PTT.The optocoupler 400 can be for example MOSFET output photoelectric coupler AQW210, but be not limited； This design not only small volume, simple structure, and have the advantages that reliability is high, fast response time.

Receiving, sending words frequency range for current most of speech handles is 200Hz~4000Hz；It is 150 Ω left to send words impedance The right side, send words sensitivity 1mV/Pa, and called impedance is 600 Ω or so, and called sensitivity is not less than 85dB/mW.The present invention is according to this Plant characteristic and devise T-shaped attenuator in the output end of voice encoding/decoding chip, impedance matching and sound attenuating are carried out to speech； The transformer that the rear end of attenuator employs permalloy is isolated to audio model, uses MOSFET output photoelectric couplers The key switch of the PTT of breadboardin speech handle, closure.

The present invention mainly has following characteristics：

1st, impedance matching and voice volume regulation are carried out using T-shaped attenuator

The good effect of the innovative point is：

Because the speech that the receiver of traditional voice handle is sent out is faint in the extreme, it is necessary to be amplified in equipment end, and If the audio signal of DAC chip output is directly connected with equipment, because the mismatch and audio signal of impedance are by equipment After internal amplifying circuit amplifies, it will produce saturation, very big noise is produced；T-shaped attenuator is added in circuit by sound After sound decay, can receive it is good if audio really.

2nd, isolated using the transformer of permalloy

The good effect of the innovative point is：

When the speech handle interface of multiple equipment links together, the noise of equipment can be by the earth signal of speech handle It is coupled, so that noise is produced, and the words sensitivity of sending of speech handle is 1mV/Pa, somewhat noise will be to speech Produce large effect；The present invention by voice signal MIC and PHONE, isolated by the audio-frequency transformer using permalloy, will Together with audio earth signal ground AGND passes through capacitance connection with systematically GND；This Isolation mode, that is, ensure that normal Speech colleague, can effectively eliminate that multiple devices connect and bring again interacts, and eliminates because being mutually coupled The noise of generation, with well audio really.

3rd, PTT is simulated using MOSFET output photoelectrics coupler circuit

The good effect of the innovative point is：

The PTT signals of speech handle usually be suspended state, be connected to ground after pressing together, in order to increase reliability and Stability, employ MOSFET output photoelectric couplers come simulated voice handle PTT buttons switch, closure, not only small volume, Simple structure, and have the advantages that reliability is high, corresponding speed is fast.

The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.

Claims

1. it is a kind of for test simulated voice handle, it is characterised in that including：Voice encoding/decoding chip, permalloy audio Transformer, T-shaped attenuator and optocoupler, wherein,

Two groups of transformers are provided with the permalloy audio-frequency transformer, impedance is respectively 150:150、600:600, two groups of transformations The input of device respectively has terminal welding system ground GND, and ungrounded end connects the voice encoding/decoding chip, described T-shaped respectively Attenuator；Output end then respectively has a terminal with answering sound handle AGND, and ungrounded end is respectively MIC leads, PHONE leads； It is attached by electric capacity C1 between the speech handle ground AGND and systematically GND；

The T-shaped attenuator includes resistance R1, R2 and R3, wherein, the first end of resistance R2 connects the voice encoding/decoding chip AO ends, second end of resistance R2 connects the first end of resistance R1, R3 respectively, the second end ground connection of resistance R3, the of resistance R1 In the two ends connection permalloy audio-frequency transformer 150:The ungrounded end of 150 transformer inputs, the permalloy In audio-frequency transformer 600:The ungrounded end of 600 transformer inputs is then connected to the AI of the voice encoding/decoding chip End；

The optocoupler has two inputs, and one of input connection control IO, another input is connected by a resistance To+3.3V power supplys, the optocoupler also has two output ends, and one of output end is the PTT signal leads of speech handle, another Individual output end connection speech handle ground AGND.

2. speech handle according to claim 1, it is characterised in that described resistance R1, R2 are 147 Ω, R3 is 3 Ω.

3. speech handle according to claim 1 and 2, it is characterised in that the electric capacity C1 is 100uF.

4. speech handle according to claim 1 and 2, it is characterised in that another input of the optocoupler is by resistance It is worth for the resistance of 510 Ω is connected to+3.3V power supplys.

5. speech handle according to claim 3, it is characterised in that another input of the optocoupler is by resistance The resistance of 510 Ω is connected to+3.3V power supplys.

6. speech handle according to claim 1 and 2, it is characterised in that the optocoupler is the coupling of MOSFET output photoelectrics Device AQW210.

7. speech handle according to claim 3, it is characterised in that the optocoupler is MOSFET output photoelectric couplers AQW210。

8. speech handle according to claim 4, it is characterised in that the optocoupler is MOSFET output photoelectric couplers AQW210。