CN205595068U - No line number word pronunciation baseband transmission system - Google Patents
No line number word pronunciation baseband transmission system Download PDFInfo
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- CN205595068U CN205595068U CN201620408792.0U CN201620408792U CN205595068U CN 205595068 U CN205595068 U CN 205595068U CN 201620408792 U CN201620408792 U CN 201620408792U CN 205595068 U CN205595068 U CN 205595068U
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Abstract
The utility model discloses a no line number word pronunciation baseband transmission system relates to the communications field, include that audio frequency input interface, audio output interface, first power amplifier, second power amplifier, audio frequency improve circuit, audio encoder, FPGA controller and data output interface, audio frequency input interface connects the input of first power amplifier, and the input that the audio frequency improves the circuit is connected to the output of first power amplifier, and the audio frequency improves the output connection audio encoder's of circuit audio input end, audio output interface connects the output of second power amplifier, and audio encoder's audio output is connected to the input of second power amplifier, the FPGA controller is connected to audio encoder's data communication end, and the data output interface is still connected to the FPGA controller, adopt the speech compression encoding and decoding of full duplex, half -duplex, compression speed mode then is 2050bs, and 2400bs, 2750bs or 3600bs (taking the FEC function) adopt the ethernet consensus standard, have high -quality expansion communication capacity for the more voice data of conveying in narrower bandwidth.
Description
Technical field
This utility model relates to the communications field, particularly to wireless digital voice baseband transmission system.
Background technology
In recent years, along with the fast development of large scale integrated circuit, the complexity of digital communication equipment is substantially reduced, the most advanced
Digital Signal Processing and being widely used so that broadband problem has not existed of the high capacity transmission medium such as optical fiber.Therefore, number
The application of word communication system is increasingly extensive.
At present, although Digital Baseband Transmission is extensive not as band-pass transmissions, but for the research of base band transmission it is still and extremely has a mind to
Justice.Widely used baseband transmission system in the short-range data communication system utilizing balanced cable to constitute；Along with digital communication skill
The development of art, baseband transmission system also has the trend developed rapidly, and it is applied not only to slow data transmission, but also at a high speed
Data are transmitted；Many problems of baseband transmission system are also the problems that band-pass transmissions system must take into；Any one uses linear
The band-pass transmissions system of modulation, can be equivalent to a baseband transmission system and study.
In practical base-band transmission system, the most all of original base band digital signal can transmit in the channel.Such as, have
Signal contains abundant direct current and low-frequency component, and synchronizing signal is extracted in inconvenience；Some signals are easily formed intersymbol interference etc..Therefore,
Baseband transmission system first problems faced is selection and the base band pulse shape selecting which type of signal form, i.e. transmission pattern
Selection.In order to obtain excellent transmission characteristic in transmission channel, typically letter code signal intensity is passed for being suitable for channel
The transmission code of defeated characteristic, i.e. carries out suitable code conversion.Owing to baseband transmission system has irreplaceable in digital transmission system
Effect, its range of application also with technology development penetrate into network service, satellite communication, mobile communication, DTV, number
The life such as word phone, each side of science and technology, the key technology being increasingly becoming in digital-communications transmission system.
Utility model content
The purpose of this utility model is to provide wireless digital voice baseband transmission system, uses full duplex, semiduplex compress speech
Encoding and decoding, compression speed pattern is then 2050b/s, 2400b/s, 2750b/s or 3600b/s (band FEC function),
Use Ethernet protocol standard, there is high-quality expansion message capacity so that in narrower bandwidth, transmit more voice number
According to.
In order to solve above-mentioned technical problem, this utility model by the following technical solutions:
Wireless digital voice baseband transmission system, including audio input interface, audio output interface, the first power amplifier, the second power amplifier,
Audio frequency improves circuit, audio coder, FPGA controller and data output interface, and audio input interface connects the defeated of the first power amplifier
Entering end, the outfan of the first power amplifier connects audio frequency and improves the input of circuit, and audio frequency improves the outfan of circuit and connects audio coding
The audio input end of device；
Audio output interface connects the outfan of the second power amplifier, and the input of the second power amplifier connects the audio output of audio coder；
The data communication end of audio coder connects FPGA controller, and FPGA controller is also connected with data output interface；
Described audio frequency improves circuit and includes resistance R58, resistance R9, electric capacity C145 and electric capacity C146, and 1 foot of resistance R9 connects
Positive supply, 2 feet of resistance R9 connect 1 foot of electric capacity C145, and 2 feet of resistance R58 connect 1 foot of electric capacity C146, resistance
1 foot of R58 connects ground wire, and 1 foot of electric capacity C145 and 1 foot of electric capacity C146 constitute described audio frequency and improve the input of circuit
End, 2 feet of electric capacity C145 and 2 feet of electric capacity C146 constitute described audio frequency and improve the outfan of circuit.
The model of described audio coder is CMX683, and 5 feet and 6 feet of described audio coder constitute described audio coder
Audio input end, the audio output that 10 feet are described audio coder of described audio coder, described audio coder
15～18 feet and 42～47 feet constitute the data communication end of described audio coder.
The model of described first power amplifier is MAX4364, and 4 feet of described first power amplifier are the input of described first power amplifier, described
5 feet of the first power amplifier and 8 feet constitute the outfan of described first power amplifier；The model of described second power amplifier is MAX4364, institute
Stating the input that 4 feet are described second power amplifier of the second power amplifier, 5 feet of described second power amplifier and 8 feet constitute described second merit
The outfan put.
Described data output interface is CAN interface, 485 interfaces, 232 interfaces or C-BUS interface.
Wireless digital voice base band transmission method based on described wireless digital voice baseband transmission system, comprises the steps:
Step 1: first access a Mike at audio input interface, and access loudspeaker at audio output interface；And one
On platform PC computer install upper computer software, and make described wireless digital voice baseband transmission system by described data output interface with
PC computer connects；
Step 2: make described wireless digital voice baseband transmission system external 24V power supply, arrange the IP of PC computer, makes PC electricity
The IP of brain and wireless digital voice baseband transmission system is in the same network segment；
Step 3: enter the Debugging interface of wireless digital voice baseband transmission system from the upper computer software of PC computer；
Step 4: user propagandas directed to communicate to Mike, Mike is generated input speech signal, and is passed by input speech signal by the first power amplifier
Giving audio frequency and improve circuit, audio frequency improves circuit and sends audio coder, audio coder pair to after input speech signal improvement
Input speech signal encodes, and generates incoming coded signal, and audio coder sends incoming coded signal to FPGA controller,
FPGA controller is sent to PC computer after incoming coded signal is carried out protocol processes；
Step 5:PC computer decodes incoming coded signal by upper computer software, and reduces input speech signal；
Step 6: input and output audio signal on the host computer on PC computer, the host computer on PC computer will export audio frequency
Signal encodes, and generates output coding signal；
Step 7:PC computer sends output coding signal by upper computer software to FPGA controller, and FPGA controller will output
Coding signal is sent to audio coder, audio coder decoding output coding signal output audio signal of reducing；
Step 8: output audio signal is sent to the second power amplifier by audio coder, the second power amplifier passes through audio output interface transmission
To loudspeaker, output audio signal play by loudspeaker；
The wireless digital voice baseband transmission system that this utility model provides, uses full duplex, semiduplex speech coding and decoding,
Compression speed pattern is then 2050b/s, 2400b/s, 2750b/s or 3600b/s (band FEC function), uses ether
FidonetFido standard, has high-quality expansion message capacity so that transmit more speech data in narrower bandwidth；This reality
Insert technology with the advanced low-complexity waveform of novel employing robust, it is provided that long-distance call level tonequality performance under low Low Level speed, and have
SDD (soft decision decoding), DTX (discontinuous transmission detection), VAD (voice activation detection), CNG (send out by comfort noise
Raw) function.Therefore, this audio coder & decoder (codec) can be widely used for phonetic storage and playback, VoIP, numeral PMR/LMR, again
The fields such as raw digital speech relaying.Integrated 16 A/D and D/A converter, analog gain amplifier and digital low-pass filtering
Device；Main frame is by controlling bus C-BUS interface configuration internal register, it is achieved difference in functionality；Port SYNC make main frame with
CMX638 synchronizes；Source signal is compressed into the Frame of low bit rate by voice compression coder, and decoder decompresses Frame,
Restorer varieties signal；Using FEC function, switch then selects forward error correction coder and decoder, and both join the compression of data
With in decompression process；STD/DTMF management module provides the special handling function of voice signal, it is achieved single-tone or double-tone detection,
Improve compress speech and decompression quality.This equipment can be widely applied to the voice in communication, image, the transmission of data；This practicality
Novel can transmit more speech data in narrower bandwidth, under limited frequency range, transmit more high-quality voice letter
Breath.
Accompanying drawing explanation
Fig. 1 is hardware elementary diagram block diagram of the present utility model；
Fig. 2 is the schematic diagram that audio frequency of the present utility model improves circuit.
Detailed description of the invention
Embodiment 1:
As it is shown in figure 1, wireless digital voice baseband transmission system, including audio input interface, audio output interface, the first merit
Put, the second power amplifier, audio frequency improve circuit, audio coder, FPGA controller and data output interface, and audio input interface is even
Connecing the input of the first power amplifier, the outfan of the first power amplifier connects audio frequency and improves the input of circuit, and audio frequency improves the output of circuit
End connects the audio input end of audio coder；
Audio output interface connects the outfan of the second power amplifier, and the input of the second power amplifier connects the audio output of audio coder；
The data communication end of audio coder connects FPGA controller, and FPGA controller is also connected with data output interface；
As in figure 2 it is shown, described audio frequency improves circuit includes resistance R58, resistance R9, electric capacity C145 and electric capacity C146, resistance
1 foot of R9 connects positive supply, and 2 feet of resistance R9 connect 1 foot of electric capacity C145, and 2 feet of resistance R58 connect electric capacity C146
1 foot, resistance R58 1 foot connect ground wire, 1 foot of electric capacity C145 and 1 foot of electric capacity C146 constitute described audio frequency and change
The input of kind circuit, 2 feet of electric capacity C145 and 2 feet of electric capacity C146 constitute described audio frequency and improve the outfan of circuit；
The model of described audio coder is CMX683, and 5 feet and 6 feet of described audio coder constitute described audio coder
Audio input end, the audio output that 10 feet are described audio coder of described audio coder, described audio coder
15～18 feet and 42～47 feet constitute the data communication end of described audio coder.
The model of described first power amplifier is MAX4364, and 4 feet of described first power amplifier are the input of described first power amplifier, described
5 feet of the first power amplifier and 8 feet constitute the outfan of described first power amplifier；The model of described second power amplifier is MAX4364, institute
Stating the input that 4 feet are described second power amplifier of the second power amplifier, 5 feet of described second power amplifier and 8 feet constitute described second merit
The outfan put.
Described data output interface is CAN interface, 485 interfaces, 232 interfaces or C-BUS interface.
Embodiment 2:
Wireless digital voice base band transmission method based on the wireless digital voice baseband transmission system described in embodiment 1, including such as
Lower step:
Step 1: first access a Mike at audio input interface, and access loudspeaker at audio output interface；And one
On platform PC computer install upper computer software, and make described wireless digital voice baseband transmission system by described data output interface with
PC computer connects；
Step 2: make described wireless digital voice baseband transmission system external 24V power supply, arrange the IP of PC computer, makes PC electricity
The IP of brain and wireless digital voice baseband transmission system is in the same network segment；
Step 3: enter the Debugging interface of wireless digital voice baseband transmission system from the upper computer software of PC computer；
Step 4: user propagandas directed to communicate to Mike, Mike is generated input speech signal, and is passed by input speech signal by the first power amplifier
Giving audio frequency and improve circuit, audio frequency improves circuit and sends audio coder, audio coder pair to after input speech signal improvement
Input speech signal encodes, and generates incoming coded signal, and audio coder sends incoming coded signal to FPGA controller,
FPGA controller is sent to PC computer after incoming coded signal is carried out protocol processes；
Step 5:PC computer decodes incoming coded signal by upper computer software, and reduces input speech signal；
Step 6: input and output audio signal on the host computer on PC computer, the host computer on PC computer will export audio frequency
Signal encodes, and generates output coding signal；
Step 7:PC computer sends output coding signal by upper computer software to FPGA controller, and FPGA controller will output
Coding signal is sent to audio coder, audio coder decoding output coding signal output audio signal of reducing；
Step 8: output audio signal is sent to the second power amplifier by audio coder, the second power amplifier passes through audio output interface transmission
To loudspeaker, output audio signal play by loudspeaker.
The wireless digital voice baseband transmission system of this utility model offer and transmission method thereof, use full duplex, semiduplex language
Sound compression coding and decoding, compression speed pattern is then 2050b/s, 2400b/s, 2750b/s or 3600b/s (band FEC
Function), use Ethernet protocol standard, there is high-quality expansion message capacity so that transmit more in narrower bandwidth
Speech data；This utility model uses the advanced low-complexity waveform of robust to insert technology, it is provided that long-distance call level sound under low Low Level speed
Matter performance, and there is SDD (soft decision decoding), DTX (discontinuous transmission detection), VAD (voice activation detection), CNG
(comfort noise generation) function.Therefore, this audio coder & decoder (codec) can be widely used for phonetic storage and playback, VoIP, numeral
The fields such as PMR/LMR, reproducing digital voice trunking.Integrated 16 A/D and D/A converter, analog gain amplifier and
Wave digital lowpass filter；Main frame is by controlling bus C-BUS interface configuration internal register, it is achieved difference in functionality；Port SYNC
Make main frame Tong Bu with CMX638；Source signal is compressed into the Frame of low bit rate by voice compression coder, and decoder is data
Frame decompresses, Restorer varieties signal；Using FEC function, switch then selects forward error correction coder and decoder, and both join
In the compression of data and decompression process；STD/DTMF management module provides the special handling function of voice signal, it is achieved single-tone
Or double-tone detection, improve compress speech and decompression quality.This equipment can be widely applied to the voice in communication, image, data
Transmission；This utility model can transmit more speech data in narrower bandwidth, under limited frequency range, transmits more high
The voice messaging of quality.
Claims (4)
1. wireless digital voice baseband transmission system, it is characterised in that: include audio input interface, audio output interface, first
Power amplifier, the second power amplifier, audio frequency improve circuit, audio coder, FPGA controller and data output interface, audio input interface
Connecting the input of the first power amplifier, the outfan of the first power amplifier connects audio frequency and improves the input of circuit, and audio frequency improves the defeated of circuit
Go out end and connect the audio input end of audio coder；
Audio output interface connects the outfan of the second power amplifier, and the input of the second power amplifier connects the audio output of audio coder；
The data communication end of audio coder connects FPGA controller, and FPGA controller is also connected with data output interface；
Described audio frequency improves circuit and includes resistance R58, resistance R9, electric capacity C145 and electric capacity C146, and 1 foot of resistance R9 connects
Positive supply, 2 feet of resistance R9 connect 1 foot of electric capacity C145, and 2 feet of resistance R58 connect 1 foot of electric capacity C146, resistance
1 foot of R58 connects ground wire, and 1 foot of electric capacity C145 and 1 foot of electric capacity C146 constitute described audio frequency and improve the input of circuit
End, 2 feet of electric capacity C145 and 2 feet of electric capacity C146 constitute described audio frequency and improve the outfan of circuit.
2. wireless digital voice baseband transmission system as claimed in claim 1, it is characterised in that: the model of described audio coder
For CMX683,5 feet of described audio coder and 6 feet constitute the audio input end of described audio coder, described audio frequency volume
The audio output that 10 feet are described audio coder of code device, 15～18 feet of described audio coder and 42～47 feet composition
The data communication end of described audio coder.
3. wireless digital voice baseband transmission system as claimed in claim 1, it is characterised in that: the model of described first power amplifier is
MAX4364,4 feet of described first power amplifier are the input of described first power amplifier, and 5 feet and 8 feet of described first power amplifier constitute
The outfan of described first power amplifier；The model of described second power amplifier is MAX4364, and 4 feet of described second power amplifier are described second
The input of power amplifier, 5 feet of described second power amplifier and 8 feet constitute the outfan of described second power amplifier.
4. wireless digital voice baseband transmission system as claimed in claim 1, it is characterised in that: described data output interface is CAN
Interface, 485 interfaces, 232 interfaces or C-BUS interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620408792.0U CN205595068U (en) | 2016-05-06 | 2016-05-06 | No line number word pronunciation baseband transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620408792.0U CN205595068U (en) | 2016-05-06 | 2016-05-06 | No line number word pronunciation baseband transmission system |
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| Publication Number | Publication Date |
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| CN205595068U true CN205595068U (en) | 2016-09-21 |
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| CN201620408792.0U Withdrawn - After Issue CN205595068U (en) | 2016-05-06 | 2016-05-06 | No line number word pronunciation baseband transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346662A (en) * | 2016-05-06 | 2017-11-14 | 南京威翔科技有限公司 | Wireless digital voice baseband transmission system and its method |
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2016
- 2016-05-06 CN CN201620408792.0U patent/CN205595068U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346662A (en) * | 2016-05-06 | 2017-11-14 | 南京威翔科技有限公司 | Wireless digital voice baseband transmission system and its method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160921 Effective date of abandoning: 20230707 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160921 Effective date of abandoning: 20230707 |