CN202713549U - Noise and echo eliminating circuit of network broadcast talkback communication station - Google Patents
Noise and echo eliminating circuit of network broadcast talkback communication station Download PDFInfo
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- CN202713549U CN202713549U CN 201220402755 CN201220402755U CN202713549U CN 202713549 U CN202713549 U CN 202713549U CN 201220402755 CN201220402755 CN 201220402755 CN 201220402755 U CN201220402755 U CN 201220402755U CN 202713549 U CN202713549 U CN 202713549U
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Abstract
The utility model relates to a noise and echo eliminating circuit of a network broadcast talkback communication station. The noise and echo eliminating circuit is characterized in that the circuit includes a DSP module, a PCM coding and decoding circuit, an amplifier, ADCs, DACs and a memory. The memory is connected with the DSP module. The amplifier is connected with the DSP module via the ADC module. The DSP module compares a voice digital signal with a noise signal transmitted by a transmitter and then carries out the noising elimination, and next the DSP module is connected with the PCM coding and decoding circuit via the DAC module. The PCM coding and decoding circuit carries out the PCM coding to an analog voice transmitted by the transmitter, and then outputs the coded analog voice to a mainboard of the talkback communication station. At the same time, the PCM coding and decoding circuit receives a PCM coded signal transmitted by the talkback communication station, and then transmits the signal to the DSP module via the ADC module. The DSP module carries out the echo elimination and then transmits the voice to a receiver for output via the DAC module. The noise and echo eliminating circuit takes the DSP as the core to carry out the noise and echo elimination so as to realize the clear duplex communication voice without distortion, so the voice sharpness is improved, and the self-excitation and howling of loudspeakers and microphones are avoided.
Description
Technical field
The utility model belongs to intercommunication communication system field, especially a kind of de-noising of network broadcast talkback communication station and echo cancellation circuit coupling.
Background technology
At present, be widely used the intercommunication communication system in the working regions such as oil, chemical industry, chemical fibre, metallurgy, power plant, above-mentioned operational environment has the characteristics such as the zone is wide, noise is large.Existing intercommunication communication system is when the larger industrial site of noisy environment, and the conversation definition is greatly affected, and particularly uses the content of almost not hearing speech under the 115dB environment.The numeral Network Based intercommunication communication system that amplifies can improve when sending, being subjected to the speech amount sidetone and changes and not quite can accept, but because background noise does not have suppressed, during conversation and voice signal synthetic input and amplify, therefore, though In Call increases, but speech quality does not still have tangible raising.In addition, at some scenes that needs manual handling equipment also will converse simultaneously, hand-free call is necessary, owing to the use hand-free function and in the situation that the duplex conversation, talked about and use 5W Yang Sheng device not accomplish, the raising power of loudspeaker can cause back and be subjected to self-excitation.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of speech quality clear and be applicable to noise than de-noising and the echo cancellation circuit coupling of the network broadcast talkback communication station of overall situation.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of de-noising of network broadcast talkback communication station and echo cancellation circuit coupling, comprise the DSP module, the PCM coding-decoding circuit, amplifier, two ADC modules, two DAC modules and memory, described memory is connected with the DSP module, amplifier is connected with transmitter and is connected on the DSP module through an ADC module, after the voice digital signal that the DSP module transmits transmitter and noise signal relatively carry out denoising Processing, be connected to the PCM coding-decoding circuit by a DAC module, the analog voice that the PCM coding-decoding circuit is sent transmitter here carries out pcm encoder and outputs on the mainboard of network broadcast talkback communication station, simultaneously, the PCM coding-decoding circuit receives the pcm encoder signal that the mainboard of network broadcast talkback communication station transmits and is decoded into analog voice and passes to the DSP module by the 2nd ADC module, passes to receiver by the voice of the 2nd DAC module after with de-noising after the DSP module is carried out echo cancellation and processed and exports.
And described memory adopts EPROM static data memory.
And described DSP module adopts the FM188 module with language process function; Described PCM coding-decoding circuit adopts the MC145480 chip; Described transmitter adopts the MAX9812L chip manufacturing.
Advantage of the present utility model and good effect are:
1, the utility model is take DSP module with language process function as core, by at the built-in phonetic algorithm of DSP module voice signal and external noise signal being compared and confirming voice signal, simultaneously that other signal is all suppressed firmly as noise source, its part as communicating circuit is connected with the mainboard of network broadcast talkback communication station, can realize that duplexing call voice is clear undistorted, greatly improve the definition of sending the language sound.
2, the voice packet that sends of the utility model is identified automatically by the DSP module, can in circuit, again do not received by the PAC circuit of oneself, thereby elimination sidetone or cross-talk.
3, the utility model carries out the echo cancellation processing by the DSP module, when hand-free call, can not make the sound passback of loud speaker, the sound that the Yang Sheng device sends is noise signal for Mike's input and is eliminated and can not enters circuit, in the situation that the self-excitation that duplex signaling has been avoided Yang Sheng device and Mike with utter long and high-pitched sounds.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
A kind of de-noising of network broadcast talkback communication station and echo cancellation circuit coupling, as shown in Figure 1, comprise the DSP module, the PCM coding-decoding circuit, amplifier, two ADC modules, two DAC modules and memory, the input of amplifier is connected with transmitter, the output of amplifier is connected on the DSP module through an ADC module, the DSP module relatively carries out being connected to the PCM coding-decoding circuit by a DAC module after the denoising Processing to voice digital signal and the noise signal that transmitter transmits, the analog voice of transmitter (after the de-noising) being sent here by the PCM coding-decoding circuit carries out pcm encoder and outputs to by PCM_OUT on the mainboard of network broadcast talkback communication station, simultaneously, the PCM coding-decoding circuit receives the pcm encoder signal that the mainboard of network broadcast talkback communication station transmits by PCM_IN and is decoded into analog voice and passes to the DSP module by the 2nd ADC module,, pass to receiver by the voice of the 2nd DAC module after with de-noising after the DSP module is carried out echo cancellation and processed and export.This DSP module also is connected with memory, moves the temporary data of needs etc. for the program of depositing.
In the present embodiment, the DSP module adopts the FM188 module, and this module is the DSP module with language process function that Fu Di company produces, and the language process function of this DSP inside modules adopts the AMBIN algorithm to carry out denoising Processing.Memory adopts EPROM static data memory stores data.The PCM coding-decoding circuit adopts the MC145480 chip, and it is connected with the mainboard of network broadcast talkback communication station by the McBSP interface.Transmitter adopts the MAX9812L chip manufacturing, built-in single 20dB fixed gain amplifier, and on distance, sound source and Mike's distance can at the 30-40 centimetre, can improve the pickup effect that makes of microphone; On directive property, the source of sound when spending less than 30 with the angle of microphone is received to be amplified, and other will be used as noise source suppressed.The power of Yang Sheng device can be selected from 0.5W～15W.
Operation principle of the present utility model is: the DSP module has the language data process function, by speech data being processed and is set up Mathematical Modeling at the built-in phonetic algorithm of DSP module, voice signal and external noise signal compared and confirm voice signal (relatively being no more than 2 seconds behind the time off-hook), other signal is all lived as noise source is suppressed.In addition, the DSP module is relatively carried out echo elimination to the voice signal that sends and the voice signal of returning, and the voice signal that while the other side sends enters and exports by being subjected to talk about.Can reach 80%-85% by repetition test and the field de-noising effect, lamprophonia can understand that background noise is suppressed.15W Yang Sheng device and Mike are apart from do not utter long and high-pitched sounds self-excitation in the time of 1 meter when hands-free use.
It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model comprises and is not limited to the embodiment described in the embodiment; every by those skilled in the art according to other execution modes that the technical solution of the utility model draws, belong to equally the scope of the utility model protection.
Claims (3)
1. the de-noising of a network broadcast talkback communication station and echo cancellation circuit coupling, it is characterized in that: comprise the DSP module, the PCM coding-decoding circuit, amplifier, two ADC modules, two DAC modules and memory, described memory is connected with the DSP module, amplifier is connected with transmitter and is connected on the DSP module through an ADC module, after the voice digital signal that the DSP module transmits transmitter and noise signal relatively carry out denoising Processing, be connected to the PCM coding-decoding circuit by a DAC module, the analog voice that the PCM coding-decoding circuit is sent transmitter here carries out pcm encoder and outputs on the mainboard of network broadcast talkback communication station, simultaneously, the PCM coding-decoding circuit receives the pcm encoder signal that the mainboard of network broadcast talkback communication station transmits and is decoded into analog voice and passes to the DSP module by the 2nd ADC module, passes to receiver by the voice of the 2nd DAC module after with de-noising after the DSP module is carried out echo cancellation and processed and exports.
2. the de-noising of network broadcast talkback communication station according to claim 1 and echo cancellation circuit coupling is characterized in that: described memory employing EPROM static data memory.
3. the de-noising of network broadcast talkback communication station according to claim 1 and 2 and echo cancellation circuit coupling is characterized in that: described DSP module adopts the FM1188 module with language process function; Described PCM coding-decoding circuit adopts the MC145480 chip; Described transmitter adopts the MAX9812L chip manufacturing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220402755 CN202713549U (en) | 2012-08-15 | 2012-08-15 | Noise and echo eliminating circuit of network broadcast talkback communication station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220402755 CN202713549U (en) | 2012-08-15 | 2012-08-15 | Noise and echo eliminating circuit of network broadcast talkback communication station |
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| CN202713549U true CN202713549U (en) | 2013-01-30 |
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| CN 201220402755 Expired - Fee Related CN202713549U (en) | 2012-08-15 | 2012-08-15 | Noise and echo eliminating circuit of network broadcast talkback communication station |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104468146A (en) * | 2014-12-10 | 2015-03-25 | 深圳市来邦实业有限公司 | Broadcast intercom system based on IP network |
| CN104602143A (en) * | 2015-02-05 | 2015-05-06 | 深圳市创世达实业有限公司 | Howlround-preventing device and microphone using same |
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
| CN107302410A (en) * | 2017-07-27 | 2017-10-27 | 山东鲁能泰山铁塔有限公司 | A kind of workshop subregion automatic network-building instant messaging broadcast system |
| CN108134881A (en) * | 2018-03-06 | 2018-06-08 | 睿云联(厦门)网络通讯技术有限公司 | A kind of echo cancellation testing tool, IP communicating terminal echo cancellation automatization test systems and its test method |
| CN109774742A (en) * | 2018-12-28 | 2019-05-21 | 上海鸣啸信息科技股份有限公司 | A kind of broadcasting for train company extension controller based on Linux platform |
| CN109861778A (en) * | 2018-12-28 | 2019-06-07 | 上海鸣啸信息科技股份有限公司 | A kind of broadcasting for train guest room power amplifier based on Linux platform |
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2012
- 2012-08-15 CN CN 201220402755 patent/CN202713549U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104468146A (en) * | 2014-12-10 | 2015-03-25 | 深圳市来邦实业有限公司 | Broadcast intercom system based on IP network |
| CN104468146B (en) * | 2014-12-10 | 2018-03-16 | 深圳来邦科技有限公司 | The broadcast intercom system of IP based network |
| CN104602143A (en) * | 2015-02-05 | 2015-05-06 | 深圳市创世达实业有限公司 | Howlround-preventing device and microphone using same |
| CN106375881A (en) * | 2016-10-09 | 2017-02-01 | 深圳来邦科技有限公司 | Full-duplex window intercom system |
| CN106375881B (en) * | 2016-10-09 | 2024-02-20 | 来邦科技股份公司 | Full duplex window intercom system |
| CN107302410A (en) * | 2017-07-27 | 2017-10-27 | 山东鲁能泰山铁塔有限公司 | A kind of workshop subregion automatic network-building instant messaging broadcast system |
| CN107302410B (en) * | 2017-07-27 | 2023-07-28 | 山东鲁能泰山铁塔有限公司 | Automatic networking instant messaging broadcasting system for production workshop subareas |
| CN108134881A (en) * | 2018-03-06 | 2018-06-08 | 睿云联(厦门)网络通讯技术有限公司 | A kind of echo cancellation testing tool, IP communicating terminal echo cancellation automatization test systems and its test method |
| CN108134881B (en) * | 2018-03-06 | 2023-07-25 | 睿云联(厦门)网络通讯技术有限公司 | Echo cancellation test tool, IP communication terminal echo cancellation automatic test system and test method thereof |
| CN109774742A (en) * | 2018-12-28 | 2019-05-21 | 上海鸣啸信息科技股份有限公司 | A kind of broadcasting for train company extension controller based on Linux platform |
| CN109861778A (en) * | 2018-12-28 | 2019-06-07 | 上海鸣啸信息科技股份有限公司 | A kind of broadcasting for train guest room power amplifier based on Linux platform |
| CN109861778B (en) * | 2018-12-28 | 2020-07-24 | 上海鸣啸信息科技股份有限公司 | L inux platform-based train broadcasting passenger room power amplifier |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20140815 |
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| EXPY | Termination of patent right or utility model |