CN107958671A - A kind of echo cancelling device of law-enforcing recorder - Google Patents
A kind of echo cancelling device of law-enforcing recorder Download PDFInfo
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- CN107958671A CN107958671A CN201711170245.9A CN201711170245A CN107958671A CN 107958671 A CN107958671 A CN 107958671A CN 201711170245 A CN201711170245 A CN 201711170245A CN 107958671 A CN107958671 A CN 107958671A
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- 108010076504 Protein Sorting Signals Proteins 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Computer Security & Cryptography (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of echo cancelling device of law-enforcing recorder,Including remote subscriber,Remote subscriber acoustic input dephonoprojectoscope,Remote subscriber voice output,First signal adapter,Radio transmission device,Sound processing apparatus,Secondary signal converter,Local user's voice output,Local user's acoustic input dephonoprojectoscope and local user,Remote subscriber passes through remote subscriber acoustic input dephonoprojectoscope,First signal adapter is connected with radio transmission device,Radio transmission device passes through sound processing apparatus,Secondary signal converter and remote subscriber voice output are connected with local user,And the output terminal of local user is connected by local user's acoustic input dephonoprojectoscope with the input terminal of secondary signal converter,The present invention is while the interference of the output data of remote subscriber in from local user's acoustic input dephonoprojectoscope,It ensure that the effect of echo cancellor in time period,Totally improve the efficiency and effect of echo cancellor.
Description
Technical field
The present invention relates to echo cancellation technology field, more particularly to a kind of echo cancelling device of law-enforcing recorder.
Background technology
In law-enforcing recorder, plateform system intercommunication, it is necessary to carry out both sides or the exchange of multi-party real-time voice, usually all
It is to use external loudspeaker playback, will necessarily so produces echo, i.e., after a side speaks, pass through the loudspeaker playback of other side, Ran Houyou
Collected by the microphone of other side and return to oneself, if do not handled echo, it will influenced speech quality, sound can be formed
Sound shakes, and generation is uttered long and high-pitched sounds, it is necessary to which technology implements echo cancellor, and existing echo cancelling device is mainly handled using echo estimate
Device, by the electric signal that local user sends compared with the raw electrical signal that remote subscriber is sent, when comparative result is being set
Threshold range in, then the repetition electric signal in the electric signal sent local user is deleted, but this method exist
Following deficiency：Echo estimate processor is to be estimated as foundation with the statistical property of input and output signal, takes specific calculation
Method automatically adjusts processor coefficient, reaches a kind of algorithm or device of optimum filtering characteristic, echo estimate processor
To each sample value of input signal sequence, by specific algorithm, renewal, adjustment weighting coefficient, make output signal sequence and phase
Hope that is, output signal sequence approaches desired signal sequence to the mean square error that output signal sequence compares, in this mistake for minimum
, it is necessary to which retention coefficient is stablized after the convergence of echo estimate processor, to ensure from local user's acoustic input dephonoprojectoscope in journey
The interference of the output data of remote subscriber, on the other hand needs echo estimate processor to keep more new state at any time, to ensure
The echo path of change can be followed the trail of, the paradox between echo estimate processor Fast Convergent and the stability of height restricts
The development of echo cancellation technology.
The content of the invention
The purpose of the present invention is to solve shortcoming existing in the prior art, and a kind of time of the law-enforcing recorder proposed
Sound cancellation element.
To achieve these goals, present invention employs following technical solution：
A kind of echo cancelling device of law-enforcing recorder, including remote subscriber, remote subscriber acoustic input dephonoprojectoscope, remote subscriber sound
Sound output device, the first signal adapter, radio transmission device, sound processing apparatus, secondary signal converter, local user
Voice output, local user's acoustic input dephonoprojectoscope and local user, the remote subscriber are filled with remote subscriber voice input
Connection is put, the output terminal of remote subscriber acoustic input dephonoprojectoscope is connected with the input terminal of the first signal adapter, the conversion of the first signal
The output terminal of device is connected with the input terminal of local user's voice output, and the first signal adapter and radio transmission device
Connection, radio transmission device are connected with sound processing apparatus, and sound processing apparatus is connected with secondary signal converter, the second letter
The output terminal of number converter is connected with the input terminal of remote subscriber voice output, the output of remote subscriber voice output
End is connected with the input terminal of local user, and the output terminal of local user and the input terminal of local user's acoustic input dephonoprojectoscope connect
Connect, the output terminal of local user's acoustic input dephonoprojectoscope is connected with the input terminal of secondary signal converter.
Preferably, first signal adapter is used to be converted to the acoustical signal that remote subscriber acoustic input dephonoprojectoscope receives
Electric signal.
Preferably, the first signal adapter is used to the electric signal that radio transmission device receives passing to remote subscriber sound
Sound output device, and acoustical signal is converted electrical signals to by remote subscriber voice output.
Preferably, the sound processing apparatus includes memory, echo estimate processor, sound frequency processor threshold
With sound intensity processor threshold, the output terminal of radio transmission device and the input terminal of memory connect, the output of memory
The input terminal with secondary signal converter, the input terminal of echo estimate processor are connected respectively at end, echo estimate processor
Output terminal be connected with the input terminal of sound frequency processor threshold, the output terminal and sound intensity of sound frequency processor threshold
The input terminal connection of processor threshold, the input terminal of the output terminal of processor and radio transmission device connects sound intensity therewith
Connect.
Preferably, the memory includes the main storage of law-enforcing recorder（Memory）, law-enforcing recorder auxiliary storage
Device（External memory）, network transmission module and network cloud disk.
Preferably, the network cloud disk is connected with fire wall, and fire wall includes key generator, cipher controlled device, key
Decipher and authentication module, key generator, cipher controlled device and secret key decryption device are used for checking or managing to network cloud disk
Reason, authentication module login network cloud disk for user, and authentication module is unlocked by fingerprint device or finger-impu system.
Preferably, the secondary signal converter is used to the electric signal of radio transmission device output passing to local use
Family voice output, and acoustical signal is converted electrical signals to by local user's output device.
Preferably, the secondary signal converter is used to be converted to the acoustical signal that local user's acoustic input dephonoprojectoscope receives
Electric signal
The beneficial effects of the invention are as follows：
1st, echo estimate processor of the present invention is to each sample value of input signal sequence, and by specific algorithm, renewal, adjust
Weighting coefficient, makes mean square error of the output signal sequence compared with desired output signal sequence for minimum, in this process,
Retention coefficient is stablized after the convergence of echo estimate processor, and in the fixed time period after coefficient keeps stablizing, coefficient is kept not
Become, that is, think in fixed time period, the external interference amount of remote subscriber and the geographical environment residing for local user is constant, so
The effect of echo cancellor can be ensured, from the interference of the output data of remote subscriber in local user's acoustic input dephonoprojectoscope, to improve
Fruit.
2nd, present invention coefficient of echo estimate processor in fixed time period remains unchanged, in order to ensure in this time
Section in echo cancellor reliability, by the output terminal of echo estimate processor successively with sound frequency processor threshold and sound
Loudness threshold processor connect, ensure that the effect of echo cancellor in time period, totally improve echo cancellor efficiency and
Effect.
Brief description of the drawings
Fig. 1 is a kind of functional block diagram of the echo cancelling device of law-enforcing recorder proposed by the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.
With reference to Fig. 1, a kind of echo cancelling device of law-enforcing recorder, including remote subscriber, remote subscriber voice input dress
Put, remote subscriber voice output, the first signal adapter, radio transmission device, sound processing apparatus, secondary signal turn
Parallel operation, local user's voice output, local user's acoustic input dephonoprojectoscope and local user, remote subscriber and remote subscriber sound
Sound input unit connects, and the output terminal of remote subscriber acoustic input dephonoprojectoscope is connected with the input terminal of the first signal adapter, and first
Signal adapter is used to the acoustical signal that remote subscriber acoustic input dephonoprojectoscope receives being converted to electric signal, i.e., user believes sound
Number electric signal is converted to by remote subscriber acoustic input dephonoprojectoscope and the first signal adapter, and the first signal adapter with it is wireless
Device for transporting electricity at heavy connects, and radio transmission device is by electric signal transmission to local user one end, radio transmission device and sound
Processing unit connects, and sound processing apparatus includes memory, echo estimate processor, sound frequency processor threshold and sound
Loudness threshold processor, the output terminal of radio transmission device and the input terminal of memory connect, the output terminal difference of memory
Input terminal, the input terminal of echo estimate processor with secondary signal converter are connected, the output of echo estimate processor
End is connected with the input terminal of sound frequency processor threshold, at the output terminal and sound intensity threshold value of sound frequency processor threshold
The input terminal connection of device is managed, the input terminal of the output terminal of processor and radio transmission device connects sound intensity therewith, storage
Device includes the main storage of law-enforcing recorder（Memory）, law-enforcing recorder additional storage（External memory）, network transmission module and
Network cloud disk, network cloud disk are connected with fire wall, and fire wall includes key generator, cipher controlled device, secret key decryption device and recognizes
Module is demonstrate,proved, key generator, cipher controlled device and secret key decryption device are used for checking or managing to network cloud disk, authentication module
Network cloud disk is logined for user, authentication module is unlocked by fingerprint device or finger-impu system, and sound processing apparatus passes through
Memory is stored electric signal, and carries out convergence by echo estimate processor and the mould within the set time is calculated
Type coefficient, sound processing apparatus are connected with secondary signal converter, output terminal and the remote subscriber sound of secondary signal converter
The input terminal connection of output device, secondary signal converter are used to the electric signal of radio transmission device output passing to local
User voice output device, and acoustical signal, the output of remote subscriber sound are converted electrical signals to by local user's output device
The output terminal of device and the input terminal of local user connect, and carry out the transmission of information first with this, the output terminal of local user with
The input terminal connection of local user's acoustic input dephonoprojectoscope, by the acoustical signal of local user（Acoustical signal including local user and remote
The acoustical signal of end subscriber）It is transferred to local user's acoustic input dephonoprojectoscope, the output terminal of local user's acoustic input dephonoprojectoscope and second
The input terminal connection of signal adapter, the acoustical signal that secondary signal converter is used to receive local user's acoustic input dephonoprojectoscope turn
Be changed to electric signal, and matched with the electric signal in echo estimate processor, by matching degree threshold range electric signal
Screen, and be transferred to sound frequency processor threshold, the mistake transmitted due to echo between remote subscriber and local user
Cheng Zhong, echo is overlapping to trigger gradually rising for echo frequency, and frequency is screened higher than the electric signal of threshold value, and by telecommunications
Number sound intensity processor threshold is transferred to, since echo is smaller in the more other sound of starting stage loudness of propagation, by sound
Degree is screened less than the electric signal of threshold value, and the electric signal for meeting above-mentioned all conditions is deleted, by the electricity after deletion
Signal is transferred to the first signal adapter, output terminal and the local user's sound of the first signal adapter by radio transmission device
The input terminal connection of sound output device, remote subscriber sound output dress is passed to by the electric signal that radio transmission device receives
Put, and acoustical signal is converted electrical signals to by remote subscriber voice output.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of echo cancelling device of law-enforcing recorder, including remote subscriber, remote subscriber acoustic input dephonoprojectoscope, remote subscriber
Voice output, the first signal adapter, radio transmission device, sound processing apparatus, secondary signal converter, local use
Family voice output, local user's acoustic input dephonoprojectoscope and local user, it is characterised in that the remote subscriber is used with distal end
Family acoustic input dephonoprojectoscope connection, the output terminal of remote subscriber acoustic input dephonoprojectoscope are connected with the input terminal of the first signal adapter,
The output terminal of first signal adapter is connected with the input terminal of local user's voice output, and the first signal adapter and nothing
Line device for transporting electricity at heavy connects, and radio transmission device is connected with sound processing apparatus, and sound processing apparatus is changed with secondary signal
Device connects, and the output terminal of secondary signal converter is connected with the input terminal of remote subscriber voice output, remote subscriber sound
The output terminal of output device and the input terminal of local user connect, and the output terminal of local user is filled with local user's voice input
The input terminal connection put, the output terminal of local user's acoustic input dephonoprojectoscope are connected with the input terminal of secondary signal converter.
A kind of 2. echo cancelling device of law-enforcing recorder according to claim 1, it is characterised in that first signal
Converter is used to the acoustical signal that remote subscriber acoustic input dephonoprojectoscope receives being converted to electric signal.
3. the echo cancelling device of a kind of law-enforcing recorder according to claim 1, it is characterised in that the first signal is changed
Device is used to the electric signal that radio transmission device receives passing to remote subscriber voice output, and passes through remote subscriber sound
Sound output device converts electrical signals to acoustical signal.
A kind of 4. echo cancelling device of law-enforcing recorder according to claim 1, it is characterised in that the acoustic processing
Device includes memory, echo estimate processor, sound frequency processor threshold and sound intensity processor threshold, radio
The output terminal of transmitting device and the input terminal of memory connect, the output terminal input with secondary signal converter respectively of memory
End, the input terminal connection of echo estimate processor, output terminal and the sound frequency processor threshold of echo estimate processor
Input terminal connection, the output terminal of sound frequency processor threshold is connected with the input terminal of sound intensity processor threshold, sound
The input terminal of the output terminal of processor and radio transmission device connects loudness therewith.
A kind of 5. echo cancelling device of law-enforcing recorder according to claim 4, it is characterised in that the memory bag
Include the main storage of law-enforcing recorder（Memory）, law-enforcing recorder additional storage（External memory）, network transmission module and network
Cloud disk.
A kind of 6. echo cancelling device of law-enforcing recorder according to claim 5, it is characterised in that the network cloud disk
It is connected with fire wall, fire wall includes key generator, cipher controlled device, secret key decryption device and authentication module, key generator,
Cipher controlled device and secret key decryption device are used for checking or managing to network cloud disk, and authentication module logins network cloud for user
Disk, authentication module are unlocked by fingerprint device or finger-impu system.
A kind of 7. echo cancelling device of law-enforcing recorder according to claim 1, it is characterised in that the secondary signal
Converter is used to the electric signal of radio transmission device output passing to local user's voice output, and passes through local use
Family output device converts electrical signals to acoustical signal.
A kind of 8. echo cancelling device of law-enforcing recorder according to claim 1, it is characterised in that the secondary signal
Converter is used to the acoustical signal that local user's acoustic input dephonoprojectoscope receives being converted to electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711170245.9A CN107958671B (en) | 2017-11-22 | 2017-11-22 | Echo cancellation device of law enforcement recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711170245.9A CN107958671B (en) | 2017-11-22 | 2017-11-22 | Echo cancellation device of law enforcement recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107958671A true CN107958671A (en) | 2018-04-24 |
| CN107958671B CN107958671B (en) | 2021-04-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711170245.9A Expired - Fee Related CN107958671B (en) | 2017-11-22 | 2017-11-22 | Echo cancellation device of law enforcement recorder |
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| Country | Link |
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| CN (1) | CN107958671B (en) |
Cited By (3)
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| CN108924462A (en) * | 2018-05-31 | 2018-11-30 | 广州市六体智能科技有限公司 | A kind of video talkback unit of law-enforcing recorder |
| CN109413522A (en) * | 2018-11-08 | 2019-03-01 | 深圳市云威物联科技有限公司 | Audio signal processing method, audio-signal processing apparatus and electronic equipment |
| CN110995950A (en) * | 2019-11-08 | 2020-04-10 | 杭州觅睿科技有限公司 | Echo cancellation self-adaption method based on PC (personal computer) end and mobile end |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108924462A (en) * | 2018-05-31 | 2018-11-30 | 广州市六体智能科技有限公司 | A kind of video talkback unit of law-enforcing recorder |
| CN109413522A (en) * | 2018-11-08 | 2019-03-01 | 深圳市云威物联科技有限公司 | Audio signal processing method, audio-signal processing apparatus and electronic equipment |
| CN109413522B (en) * | 2018-11-08 | 2020-09-04 | 深圳市云威物联科技有限公司 | Sound signal processing method, sound signal processing device and electronic equipment |
| CN110995950A (en) * | 2019-11-08 | 2020-04-10 | 杭州觅睿科技有限公司 | Echo cancellation self-adaption method based on PC (personal computer) end and mobile end |
| CN110995950B (en) * | 2019-11-08 | 2022-02-01 | 杭州觅睿科技股份有限公司 | Echo cancellation self-adaption method based on PC (personal computer) end and mobile end |
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| Publication number | Publication date |
|---|---|
| CN107958671B (en) | 2021-04-13 |
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