CN207819895U - A kind of vehicle radio station audio signal processing circuit based on LTE - Google Patents
A kind of vehicle radio station audio signal processing circuit based on LTE Download PDFInfo
- Publication number
- CN207819895U CN207819895U CN201721831316.0U CN201721831316U CN207819895U CN 207819895 U CN207819895 U CN 207819895U CN 201721831316 U CN201721831316 U CN 201721831316U CN 207819895 U CN207819895 U CN 207819895U
- Authority
- CN
- China
- Prior art keywords
- amplifier
- circuit
- resistance
- audio signal
- lte
- Prior art date
- 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.)
- Active
Links
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The utility model discloses a kind of vehicle radio station audio signal processing circuit based on LTE, including input module, acquisition process circuit, volume control circuit, audio-frequency transformer, microcontroller；The external hand-held microphone input signal of input module；The acquisition process circuit includes amplifying circuit and filter circuit；Volume control circuit includes the two-channel electronic sound volume controller of serial data control；Microcontroller is for sending a command to volume control circuit, control volume control circuit work；The input signal adjusts volume, then be output to channel device through audio-frequency transformer after amplifying circuit and filter circuit processing by volume control circuit.The utility model circuit structure is simple, and the high quality output of city underground traffic audio system audio signal may be implemented, improve the performance of voice system, facilitates volume adjustment and control accuracy is high.
Description
Technical field
The utility model is related to urban transportation subway Vehicle mounted station wireless communication audio designing techniques, are based particularly on LTE's
Audio Design system signal processing circuit.
Background technology
The wireless communication system of present subway transportation mainly has TETRA and LTE system, excellent with the development of LTE technologies
Gesture obviously slowly highlights in terms of city underground traffic.LTE secondary development Vehicle mounted station systems realize subway based on the more of LTE private networks
Media cluster dispatching communications subsystem, realizes the dispatch multimedia communication of voice and video.
It is required according to owner, the baseband radio and ether of LTE standard (is included using the LTE terminal EV750 of Ding Qiao companies
Net, audio input output and control interface etc.), in conjunction with multimedia terminal is ground certainly, realizes in driver's cabin and operated convenient for driver
Have audio-video collection storage, video show touch screen unit, audio amplification loudspeaker unit, physical button, Mike input
Unit (including MIC inputs, PTT inputs, urgent call etc.) etc. has good man-machine interface and meets owner's concrete application demand
Multimedia control terminal.
Currently, still remaining deficiency in city underground traffic TETRA Audio Designs part, design redundancy is complicated, and audio makes
With will appear in the process signal concussion, have the problems such as noise.Therefore, in order to which the performance for improving audio system is proposed based on LTE
Audio signal processing circuit designs.
Utility model content
Purpose of utility model：Of the existing technology in order to solve the problems, such as, design structure is simple, quality of output signals is high
Voicefrequency circuit, the utility model provide a kind of vehicle radio station audio signal processing circuit based on LTE.
Technical solution：A kind of vehicle radio station audio signal processing circuit based on LTE, including input module, acquisition process
Circuit, volume control circuit, audio-frequency transformer, microcontroller；The external hand-held microphone input signal of input module；At the acquisition
It includes amplifying circuit and filter circuit to manage circuit；Volume control circuit includes the two-channel electronic sound volume control of serial data control
Device；Microcontroller is for sending a command to volume control circuit, control volume control circuit work；The input signal is through amplification
After circuit and filter circuit processing, volume is adjusted by volume control circuit, then channel device is output to through audio-frequency transformer.
Preferably, amplifying circuit includes amplifier U1, and the output end of input module passes through concatenated resistance R1 and capacitance C1
Ground connection, the output end of input module connect the inverting input of amplifier U1 by concatenated resistance R2 with capacitance R2 simultaneously；It puts
Feedback resistance R3, feedback resistance R3 shunt capacitances C3 are bridged between the output end and inverting input of big device U1；Amplifier U1's
In-phase input end is grounded；The output end of amplifier U1 passes through polar capacitor C4 connection filter circuits.Capacitance C3 is polar capacitor, can
It is shaken to prevent stop signal.
Preferably, filter circuit is bandpass filter, including amplifier U2A, amplifier U2B；Audio signal passes through amplification
In-phase input end through resistance C5 access amplifiers U2B after circuit amplification；The in-phase input end of amplifier U2B is connect by resistance R5
Ground；Resistance R4, the output end of amplifier U2B and reversed input are bridged between the output end and capacitance C5 input terminals of amplifier U2B
End is directly connected to；The output end of amplifier U2B is connect by capacitance C6, resistance R6 with one end of resistance R7, and resistance R7's is another
The in-phase input end of end connection amplifier U2A, the in-phase input end of amplifier U2A are also grounded by capacitance C7；Amplifier U2A's
Flying capcitor C8 between output end and one end of resistance R7；The output end of amplifier U2A directly with the reversed input of amplifier U2A
End connection；The output end of amplifier U2A passes through polar capacitor C9 connection volume control circuits.
Preferably, the output end of amplifier U2A passes through the first of polar capacitor C9 connection two-channel electronic sound volume controllers
Pin；The 4th pin, the 5th pin of two-channel electronic sound volume controller are connected by resistance R9, resistance R8 and microcontroller respectively
It connects；Second pin is exported through resistance R10 and is connect with audio-frequency transformer；6th pin connects power supply, and the 6th pin passes through electricity
Hold C10 ground connection.
Preferably, the two-channel electronic sound volume controller of the serial data control uses chip M62429.Use electronics
Volume control chip M62429, peripheral circuit is simple, and volume control precision is high, facilitates volume control.
Preferably, further include another acquisition process circuit, output module, the input terminal company of another acquisition process circuit
The output of channel device is connect, the output end of another acquisition process circuit connects volume controller, then is exported through output module.
Preferably, further include audio coding decoding module, signal selection module, the audio coding decoding module is for volume
Controller treated audio signal carries out coding and decoding, and signal selection module is used to select the channel of different audio signals.
Advantageous effect：A kind of vehicle radio station audio signal processing circuit based on LTE provided by the utility model, compares
The prior art, 1) circuit structure is simple, can effectively inhibit distorted signals, ensure that high-quality signal exports, acoustical quality
It is good；2) the two-channel electronic sound volume controller M62429 for using serial data to control, peripheral circuit is simple, occupied space
It is small, keep circuit structure more compact, repairs and safeguard convenient for the later stage；3) divide amplifier feed-back resistor coupled in parallel polarity in signal amplifying part
Capacitance prevents signal from shaking；4) the high quality output for realizing city underground traffic audio system audio signal, improves voice system
Performance, facilitate volume adjustment and control accuracy high.
Description of the drawings
Fig. 1 is vehicle radio station audio signal processing circuit hardware block diagram of the utility model based on LTE；
Fig. 2 is audio signal processing circuit amplifier section provided by the utility model schematic diagram；
Fig. 3 is audio signal processing circuit filtering part schematic diagram provided by the utility model；
Fig. 4 is audio signal processing circuit volume control schematic diagram provided by the utility model.
Specific implementation mode
Utility model is described further in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, the vehicle radio station audio signal processing circuit based on LTE, including input module, acquisition process electricity
Road, volume control circuit, audio-frequency transformer, microcontroller；The external hand-held microphone input signal of input module；The acquisition process
Circuit includes amplifying circuit and filter circuit；Volume control circuit includes the two-channel electronic sound volume control of serial data control
Device；Microcontroller is for sending a command to volume control circuit, control volume control circuit work；The input signal is through amplification
After circuit and filter circuit processing, volume is adjusted by volume control circuit, then channel device is output to through audio-frequency transformer.
As shown in Fig. 2, amplifying circuit includes amplifier U1, the output end of input module passes through concatenated resistance R1 and capacitance
C1 is grounded, and the output end of input module connects the inverting input of amplifier U1 by concatenated resistance R2 with capacitance R2 simultaneously；
Feedback resistance R3, feedback resistance R3 shunt capacitances C3 are bridged between the output end and inverting input of amplifier U1；Amplifier U1
In-phase input end ground connection；The output end of amplifier U1 passes through polar capacitor C4 connection filter circuits.
As shown in figure 3, filter circuit is bandpass filter, including amplifier U2A, amplifier U2B；Audio signal is by putting
In-phase input end through resistance C5 access amplifiers U2B after big circuit amplification；The in-phase input end of amplifier U2B passes through resistance R5
Ground connection；Between the output end and capacitance C5 input terminals of amplifier U2B bridge resistance R4, the output end of amplifier U2B with reversely it is defeated
Enter end to be directly connected to；The output end of amplifier U2B is connect by capacitance C6, resistance R6 with one end of resistance R7, and resistance R7's is another
One end connects the in-phase input end of amplifier U2A, and the in-phase input end of amplifier U2A is also grounded by capacitance C7；Amplifier U2A
Output end and one end of resistance R7 between flying capcitor C8；The output end of amplifier U2A is directly reversed defeated with amplifier U2A
Enter end connection；The output end of amplifier U2A passes through polar capacitor C9 connection volume control circuits.
As shown in figure 4, the output end of amplifier U2A pass through polar capacitor C9 connection two-channel electronic sound volume controllers
One pin；The 4th pin, the 5th pin of two-channel electronic sound volume controller pass through resistance R9, resistance R8 and microcontroller respectively
Connection；Second pin is exported through resistance R10 and is connect with audio-frequency transformer；6th pin connects power supply, and the 6th pin passes through
Capacitance C10 ground connection.
The two-channel electronic sound volume controller of the serial data control uses chip M62429, can also use other cores
Piece.The two-channel electronic sound volume controller M62429 used, peripheral circuit is simple, and volume control precision is high, facilitates volume control.
The first pin of chip M62429 is input terminal, and second pin is output end, and third pin is ground terminal, and the 4th pin is in order to control
End, the 5th pin are clock, and the 6th pin is power end, and the 7th pin is second output end, and the 8th pin is second defeated
Enter end.
The course of work of the audio signal processing circuit：After voice input portion receives the voltage signal inputted by hand-held microphone
By the amplification of dual-audio operational amplifier, filtering, the two-channel electronic sound volume controller then controlled through serial data most passes through afterwards
Audio-frequency transformer is input to LTE terminal channel device EV750；The audio signal processing circuit amplifier section, hand-held microphone are inputted by amplifying
The inverting input of device U1 is inputted by series capacitance C2 and resistance R2, and is grounded by capacitance C1 and first resistor R1, and
The output end of amplifier U1 has feedback resistance and parallel resistance with inverting input bridging；Amplifying circuit is connected by polar capacitor
Filter circuit part, filter circuit module are bandpass filter, and the output end of filter circuit is connected by a polar capacitor to be adjusted
The volume control module of volume.
Further include another acquisition process circuit, output module to handle the audio signal that channel device passes over, it is described
The output end of the output of the input terminal connecting channel machine of another acquisition process circuit, another acquisition process circuit connects volume control
Device, then exported through output module.Two-way sound channel can be controlled using two-channel electronic sound volume controller respectively, can both be handled
Hand-held microphone input audio signal, the audio signal passed over by channel device can also be handled, by its by output module into
Row output, is generally exported by loudspeaker, is independent of each other.
Further include audio coding decoding module, signal selection module, the audio coding decoding module is used for volume controller
Audio signal that treated carries out coding and decoding, and signal selection module is used to select the audio signal of different sound channels.The present embodiment
Microprocessor use IMX6Q, microprocessor is for controlling electronic sound volume controller M62429, audio coding decoding module and signal
Selecting module.
Claims (8)
1. a kind of vehicle radio station audio signal processing circuit based on LTE, which is characterized in that including input module, acquisition process
Circuit, volume control circuit, audio-frequency transformer, microcontroller；The external hand-held microphone input signal of input module；At the acquisition
It includes amplifying circuit and filter circuit to manage circuit；Volume control circuit includes the two-channel electronic sound volume control of serial data control
Device；Microcontroller is for sending a command to volume control circuit, control volume control circuit work；The input signal is through amplification
After circuit and filter circuit processing, volume is adjusted by volume control circuit, then channel device is output to through audio-frequency transformer.
2. the vehicle radio station audio signal processing circuit according to claim 1 based on LTE, which is characterized in that amplification electricity
Road includes amplifier U1, and the output end of input module passes through concatenated resistance R1 and capacitance C1 ground connection, the output end of input module
Connect the inverting input of amplifier U1 with capacitance R2 by concatenated resistance R2 simultaneously；The output end of amplifier U1 and reverse phase are defeated
Enter and bridges feedback resistance R3, feedback resistance R3 shunt capacitances C3 between holding；The in-phase input end of amplifier U1 is grounded；Amplifier U1
Output end pass through polar capacitor C4 connection filter circuits.
3. the vehicle radio station audio signal processing circuit according to claim 1 or 2 based on LTE, which is characterized in that filtering
Circuit is bandpass filter, including amplifier U2A, amplifier U2B；Audio signal connects after being amplified by amplifying circuit through resistance C5
Enter the in-phase input end of amplifier U2B；The in-phase input end of amplifier U2B is grounded by resistance R5；The output end of amplifier U2B
Resistance R4 is bridged between capacitance C5 input terminals, output end and the reverse input end of amplifier U2B are directly connected to；Amplifier U2B
Output end connect with one end of resistance R7 by capacitance C6, resistance R6, the same phase of the other end of resistance R7 connection amplifier U2A
The in-phase input end of input terminal, amplifier U2A is also grounded by capacitance C7；One end of the output end and resistance R7 of amplifier U2A
Between flying capcitor C8；The output end of amplifier U2A is directly connect with the reverse input end of amplifier U2A；Amplifier U2A's is defeated
Outlet passes through polar capacitor C9 connection volume control circuits.
4. the vehicle radio station audio signal processing circuit according to claim 3 based on LTE, which is characterized in that amplifier
The first pin that the output end of U2A passes through polar capacitor C9 connection two-channel electronic sound volume controllers；Two-channel electronic sound volume control
The 4th pin, the 5th pin of device processed are connect by resistance R9, resistance R8 with microcontroller respectively；Second pin is through resistance R10
It exports and is connect with audio-frequency transformer；6th pin connects power supply, and the 6th pin is grounded by capacitance C10.
5. according to any vehicle radio station audio signal processing circuit based on LTE of claim 1,2,4, feature exists
In the two-channel electronic sound volume controller of the serial data control uses chip M62429.
6. the vehicle radio station audio signal processing circuit according to claim 1 or 2 based on LTE, which is characterized in that also wrap
Another acquisition process circuit, output module are included, the output of the input terminal connecting channel machine of another acquisition process circuit is another
The output end of acquisition process circuit connects volume controller, then is exported through output module.
7. the vehicle radio station audio signal processing circuit according to claim 1 or 2 based on LTE, which is characterized in that also wrap
Include audio coding decoding module, signal selection module, the audio coding decoding module is used for volume controller treated audio
Signal carries out coding and decoding, and signal selection module is used to select the channel of different audio signals.
8. the vehicle radio station audio signal processing circuit according to claim 2 based on LTE, which is characterized in that the electricity
It is polar capacitor to hold C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721831316.0U CN207819895U (en) | 2017-12-22 | 2017-12-22 | A kind of vehicle radio station audio signal processing circuit based on LTE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721831316.0U CN207819895U (en) | 2017-12-22 | 2017-12-22 | A kind of vehicle radio station audio signal processing circuit based on LTE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207819895U true CN207819895U (en) | 2018-09-04 |
Family
ID=63330722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721831316.0U Active CN207819895U (en) | 2017-12-22 | 2017-12-22 | A kind of vehicle radio station audio signal processing circuit based on LTE |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207819895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092686A (en) * | 2017-12-22 | 2018-05-29 | 南京地铁建设有限责任公司 | A kind of vehicle radio station audio signal processing circuit based on LTE |
-
2017
- 2017-12-22 CN CN201721831316.0U patent/CN207819895U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092686A (en) * | 2017-12-22 | 2018-05-29 | 南京地铁建设有限责任公司 | A kind of vehicle radio station audio signal processing circuit based on LTE |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202352339U (en) | Vehicle-mounted sound system | |
| CN103167371A (en) | Bluetooth headset with record storage function and vehicle with same | |
| CN103716459A (en) | Audio system having mobile phone and intercom call functions | |
| CN105610564A (en) | Mining intrinsic safety type bidirectional digital audio broadcasting system and related hardware architecture thereof | |
| CN205249440U (en) | Take bluetooth headset of alternate form interface | |
| CN207819895U (en) | A kind of vehicle radio station audio signal processing circuit based on LTE | |
| CN203193859U (en) | Bluetooth audio system with telephone recording function | |
| CN105072241A (en) | Anti-sidetone circuit of intercom system isolation transformer | |
| CN204795237U (en) | Intercom system isolation transformer antisidetone circuit | |
| CN108092686A (en) | A kind of vehicle radio station audio signal processing circuit based on LTE | |
| CN201919289U (en) | Vehicular device | |
| CN207677971U (en) | Three road audio power amplifiers of one kind and broadcast system | |
| CN203193844U (en) | Bluetooth headset with record storage function and vehicle provided with Bluetooth headset with record storage function | |
| CN205302942U (en) | On -vehicle audio processing system | |
| CN205283833U (en) | Wireless access gateway equipment of synthesizing of integrated doorbell suggestion | |
| CN202261691U (en) | IP (Internet Protocol)-network-based conversation station | |
| CN207995368U (en) | A kind of DSP tuning systems for vehicle audio | |
| CN203968347U (en) | A kind of sound system | |
| CN202998446U (en) | Audio signal transmission equipment and vehicle-mounted multimedia system | |
| CN207993480U (en) | A kind of DSP tuning systems | |
| CN206596180U (en) | A kind of headset | |
| CN207022190U (en) | A kind of signal amplification circuit and power amplifying device | |
| CN202979154U (en) | Building intercommunication system based on electric power communication technology | |
| CN202111666U (en) | Voice circuit with high-frequency filter function and mobile terminal | |
| CN207083192U (en) | A kind of intercom wireless communication apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |