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WO2017143690A1 - Procédé et dispositif d'annulation d'écho à utiliser dans une communication vocale - Google Patents

Procédé et dispositif d'annulation d'écho à utiliser dans une communication vocale Download PDF

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Publication number
WO2017143690A1
WO2017143690A1 PCT/CN2016/084688 CN2016084688W WO2017143690A1 WO 2017143690 A1 WO2017143690 A1 WO 2017143690A1 CN 2016084688 W CN2016084688 W CN 2016084688W WO 2017143690 A1 WO2017143690 A1 WO 2017143690A1
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WO
WIPO (PCT)
Prior art keywords
signal
far
signal strength
echo cancellation
speech signal
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.)
Ceased
Application number
PCT/CN2016/084688
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English (en)
Chinese (zh)
Inventor
郑泽龙
王云华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen TCL Digital Technology Co Ltd
Original Assignee
Shenzhen TCL Digital Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shenzhen TCL Digital Technology Co Ltd filed Critical Shenzhen TCL Digital Technology Co Ltd
Publication of WO2017143690A1 publication Critical patent/WO2017143690A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/20—Arrangements for preventing acoustic feed-back
    • 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

Definitions

  • the present invention relates to the field of voice communication technologies, and in particular, to an echo cancellation method and apparatus for voice communication.
  • the mobile terminal is usually provided with a speaker and a microphone, wherein the microphone is generally provided with a sealing structure to prevent the sound of the speaker from being transmitted into the microphone and causing the opposite end to generate an echo.
  • the sealing structure of the microphone of the mobile terminal is poorly sealed, and the sound transmitted from the far end of the speaker is transmitted to the microphone, so that
  • the user uses the mobile terminal to perform voice communication with other users, the other party will hear his own voice, which becomes an acoustic echo. If the echo is not processed, the call quality and user experience will be affected, and more serious. The formation of shock, resulting in howling, seriously reduced the quality of the call voice.
  • the invention provides an echo cancellation method and device for voice communication, the main purpose of which is to eliminate echo generated during a voice call and improve call voice quality.
  • the present invention provides an echo cancellation method for voice communication, and the echo cancellation method of the voice communication includes:
  • the near-end device When receiving the far-end voice signal transmitted by the remote device, the near-end device plays the received far-end voice signal, and acquires a frequency point that occurs most frequently in the far-end voice signal;
  • the vocal speech signal is obtained by performing a band pass filtering process on the far-end speech signal according to a preset cutoff frequency interval, wherein the preset cutoff frequency interval is a vocal frequency range;
  • the near-end device collects a near-end sound to form a near-end voice signal
  • the sound generated by the near-end device includes playing the sound generated by the far-end voice signal, determining whether the signal strength of the far-end voice signal is greater than a first preset signal strength, and the near-end Whether the signal strength of the voice signal is greater than the second preset signal strength;
  • the number of occurrences is the most Frequency cancellation of the near-end speech signal
  • the step of determining whether the signal strength of the far-end voice signal is greater than the first preset signal strength comprises:
  • the signal strength of the far-end speech signal is greater than the first preset signal strength when a preset number of the sub-band power spectrum is greater than a preset threshold, otherwise determining the signal of the far-end speech signal The intensity is less than the first predetermined signal strength.
  • the present invention provides an echo cancellation method for voice communication, and the echo cancellation method of the voice communication includes:
  • the near-end device When receiving the far-end voice signal transmitted by the remote device, the near-end device plays the received far-end voice signal, and acquires a frequency point that occurs most frequently in the far-end voice signal;
  • the near-end device collects a near-end sound to form a near-end voice signal
  • the step of acquiring the frequency point that occurs most frequently in the far-end voice signal includes:
  • the echo cancellation method of the voice communication further includes the following steps:
  • the echo cancellation method of the voice communication further includes the following steps:
  • the signal strength of the far-end speech signal is greater than the first preset signal strength, and the signal strength of the near-end speech signal is greater than the second preset signal strength, performing the obtaining according to the acquired The step of echo cancellation of the near-end speech signal with the most frequently occurring frequency point. Otherwise, the collected near-end speech signal is sent to the remote device.
  • the step of determining whether the signal strength of the far-end voice signal is greater than the first preset signal strength comprises:
  • the signal strength of the far-end speech signal is greater than the first preset signal strength when a preset number of the sub-band power spectrum is greater than a preset threshold, otherwise determining the signal of the far-end speech signal The intensity is less than the first predetermined signal strength.
  • the present invention further provides an echo cancellation device for voice communication, where the echo cancellation device of the voice communication includes:
  • a voice playing module configured to: when receiving the far-end voice signal transmitted by the remote device, play the received far-end voice signal
  • a frequency point obtaining module configured to acquire a frequency point that occurs most frequently in the far-end voice signal when receiving the far-end voice signal transmitted by the remote device;
  • a signal acquisition module configured to collect a near-end sound to form a near-end speech signal
  • An echo cancellation module configured to perform echo cancellation on the near-end speech signal according to the obtained frequency point with the most occurrences
  • a signal sending module configured to send the echo-erased near-end voice signal to the remote device.
  • the frequency point obtaining module comprises:
  • a signal filtering unit configured to perform a band pass filtering process on the far end speech signal according to a preset cutoff frequency interval, to obtain a vocal speech signal, wherein the preset cutoff frequency interval is a vocal frequency range;
  • the frequency point statistics unit is configured to count the frequency points that occur most frequently in the voice signal.
  • the echo cancellation device of the voice communication further includes:
  • a determining module configured to determine whether the near-end sound collected by the near-end device includes a sound generated by playing the far-end voice signal
  • the echo cancellation module is further configured to: when the sound generated by the far-end voice signal is included in the near-end sound collected by the near-end device, according to the obtained frequency point with the most occurrences Near-end speech signal for echo cancellation;
  • the signal sending module is further configured to send the collected near-end voice signal to the sound when the sound generated by the far-end voice signal is not included in the near-end sound collected by the near-end device Remote device.
  • the echo cancellation device of the voice communication further includes:
  • a signal determining module configured to determine whether a signal strength of the far-end speech signal is greater than a first preset signal strength, and whether a signal strength of the near-end speech signal is greater than a second preset signal strength;
  • the echo cancellation module is further configured to: when a signal strength of the far-end speech signal is greater than the first preset signal strength, and a signal strength of the near-end speech signal is greater than the second preset signal strength, Performing echo cancellation on the near-end speech signal according to the obtained frequency point with the most occurrences;
  • the signal sending module is further configured to: when a signal strength of the far-end voice signal is less than or equal to the first preset signal strength, or a signal strength of the near-end voice signal is less than or equal to the second preset At the signal strength, the collected near-end speech signal is sent to the remote device.
  • the signal determining module comprises:
  • a signal processing unit configured to perform a windowing process on the far-end speech signal, perform Fourier transform to obtain a frequency domain power spectrum of the far-end speech signal, and divide the frequency domain power spectrum into a plurality of sub-bands;
  • a signal determining unit configured to determine that a signal strength of the far-end speech signal is greater than a first preset signal strength when a power spectrum of the preset number of the sub-bands is greater than a preset threshold, otherwise, determining the The signal strength of the far end speech signal is less than the first preset signal strength.
  • the echo cancellation method and device for voice communication provided by the present invention, when the near-end device receives the far-end voice signal transmitted by the remote device, plays the far-end voice signal, and acquires the frequency with the most occurrences in the far-end voice signal.
  • the microphone collects the near-end sound to form a near-end speech signal, and then performs echo cancellation on the near-end speech signal according to the frequency point with the most occurrences, which will be echo-removed.
  • the near-end voice signal is sent to the remote device, and since the collected near-end sound may include the sound of the far-end voice signal played by the near-end device speaker, the present invention removes the echo cancellation processing of the near-end voice signal, and removes The near-end device speaker included in the near-end voice signal plays the sound generated by the far-end voice signal, so as to prevent the near-end device from collecting the played far-end voice signal and then transmitting it to the remote device again, forming an echo at the remote device. Improve voice quality in voice communication.
  • FIG. 1 is a flow chart of a first embodiment of an echo cancellation method for voice communication according to the present invention
  • FIG. 2 is a schematic flowchart showing a refinement process of a frequency point acquisition step in a first embodiment of an echo cancellation method for a voice communication according to the present invention
  • FIG. 3 is a schematic diagram of functional modules of a first embodiment of an echo cancellation apparatus for voice communication according to the present invention
  • FIG. 4 is a schematic diagram of a refinement function module of a frequency point acquisition module in a first embodiment of an echo cancellation apparatus for voice communication according to the present invention
  • FIG. 5 is a schematic diagram of functional modules of a second embodiment of an echo cancellation apparatus for voice communication according to the present invention.
  • the present invention provides an echo cancellation method for voice communication.
  • FIG. 1 a flow chart of a first embodiment of an echo cancellation method for voice communication according to the present invention is shown.
  • the echo cancellation method of the voice communication includes:
  • Step S10 When the far-end voice signal transmitted by the remote device is received, the near-end device plays the received far-end voice signal, and acquires a frequency point that occurs most frequently in the far-end voice signal.
  • the near-end device and the remote device in this embodiment may be terminals capable of real-time voice communication, such as a mobile phone, a tablet, etc., and the terminal may include a speaker for playing a voice signal; the terminal may include a microphone The microphone is for detecting a sound signal, wherein the sound signal includes a voice signal played by the speaker.
  • the near-end device, the remote device, the near-end voice signal, and the far-end voice signal described below are only relative, not absolute, for example, user A is using the mobile phone to make a voice call with user B.
  • the mobile phone used is a near-end device, and the mobile phone used by user A is a remote device, and for user A, the mobile phone used is a near-end device, and the mobile phone used by user B is a far-end device. End device.
  • the near-end device plays the received far-end voice signal when receiving the far-end voice signal transmitted by the remote device, and simultaneously performs the remote voice signal.
  • the frequency of the most frequently occurring frequency in the far-end speech signal is obtained by parsing, which is the main frequency of the human voice in the far-end speech signal, and is used as a reference frequency for subsequent echo cancellation.
  • step S10 may include the following refinement steps:
  • Step S11 performing band-pass filtering processing on the far-end speech signal according to a preset cutoff frequency interval, to obtain a vocal speech signal, wherein the preset cutoff frequency interval is a vocal frequency range;
  • step S12 the frequency point with the most occurrences in the voice signal of the vocal is counted.
  • the far-end speech signal may be band-pass filtered by a band pass filter to filter out noises other than human voices in the signal to obtain a vocal speech signal, so as to obtain a more accurate frequency point.
  • the preset cutoff frequency interval of the band pass filter may be a range of vocal frequencies, that is, a range of sound frequencies that a person can emit, or a range of general sound frequencies when a person speaks, for example, 50-5000 Hz, or 500-5000 Hz, etc. .
  • the frequency of occurrence of the most vocal speech signal is counted.
  • the preset cutoff frequency interval may be a cutoff frequency interval set in real time after being analyzed by the voice of the remote user.
  • Step S20 the near-end device collects the near-end sound to form a near-end voice signal
  • Step S30 Perform echo cancellation on the near-end speech signal according to the obtained frequency point with the most occurrences, and send the echo-erased near-end speech signal to the remote device.
  • the near-end device plays the far-end voice signal
  • its microphone also collects the near-end sound to form a near-end voice signal, wherein the sound played in the speaker of the near-end device may be collected.
  • Performing echo cancellation on the near-end speech signal to eliminate the signal corresponding to the most frequently occurring frequency point in the near-end speech signal For example, the far-end speech signal in the near-end speech signal may be eliminated by a band pass filter. The signal corresponding to the most frequently occurring frequency point is used for echo cancellation. Alternatively, according to the obtained frequency points, the far-end speech signal and the echo cancellation algorithm perform echo cancellation on the near-end speech signal.
  • the echo cancellation method of the voice communication further includes the following steps:
  • step S30 is performed;
  • step S30 the collected near-end voice signal is directly sent to the remote device.
  • an echo cancellation mode may be set for the device.
  • the above steps S10-S30 are performed, and when echo cancellation is not required, the mode is turned off.
  • the near-end device plays the far-end voice signal when receiving the far-end voice signal transmitted by the remote device, and acquires the frequency point with the most occurrences in the far-end voice signal. While the near-end device plays the above-mentioned far-end speech signal, the microphone collects the near-end sound to form a near-end speech signal, and then performs echo cancellation on the near-end speech signal according to the frequency point with the most occurrences, which will be echo-removed near.
  • the end voice signal is sent to the remote device, and since the collected near-end sound may include the sound of the far-end voice signal played by the near-end device speaker, the present invention performs echo cancellation processing on the near-end voice signal, and removes the near sound.
  • the near-end device speaker included in the end voice signal plays the sound generated by the far-end voice signal, so as to prevent the near-end device from collecting the played far-end voice signal and then transmitting it to the remote device again, forming an echo at the remote device, improving Voice quality in voice communication.
  • a second embodiment of the echo cancellation method of the voice communication of the present invention is proposed based on the first embodiment of the echo cancellation method of the voice communication of the present invention.
  • the method is different from the first embodiment in that, before step S30, the echo cancellation method of the voice communication further includes the following steps:
  • the signal strength of the far-end speech signal is greater than the first preset signal strength, and the signal strength of the near-end speech signal is greater than the second preset signal strength, performing the obtaining according to the acquired The step of echo cancellation of the near-end speech signal with the most frequently occurring frequency point. Otherwise, the collected near-end speech signal is sent to the remote device.
  • the signal strength of the far-end speech signal is greater than the first preset signal strength when a preset number of the sub-band power spectrum is greater than a preset threshold, otherwise determining the signal of the far-end speech signal The intensity is less than the first predetermined signal strength.
  • the frequency domain power spectrum is divided into a plurality of sub-bands.
  • the frequency domain power spectrum is divided into 32 sub-bands, wherein the number of sub-bands can be set according to user requirements, and if The 32 subbands, the power spectrum value of each subband can be represented by one bit, and a total of 32 bits are required, and a 32-bit data type can be used to represent the frequency spectrum value of the speech signal.
  • the determination may be made in the same manner as the above steps, and details are not described herein again.
  • the echo cancellation method for voice communication proposed in this embodiment first determines the signal strength of the near-end speech signal of the far-end speech signal before performing echo cancellation, and compares the signal strengths of the far-end speech signal and the near-end speech signal. When large, the echo cancellation processing is performed on the near-end signal. If one of the signals is weak (please confirm whether the echo is weak when the near-end speech signal is strong and the echo signal is needed when the far-end speech signal is strong), the echo generates the call quality. The impact will be small, and echo cancellation can be eliminated to save resources.
  • the invention also proposes an echo cancellation device for voice communication.
  • FIG. 3 it is a schematic diagram of functional modules of a first embodiment of an echo cancellation apparatus for voice communication according to the present invention.
  • the echo cancellation device of the voice communication includes:
  • the voice playing module 10 is configured to: when receiving the far-end voice signal transmitted by the remote device, play the received far-end voice signal;
  • the frequency point obtaining module 20 is configured to acquire a frequency point that occurs most frequently in the far-end voice signal when receiving the far-end voice signal transmitted by the remote device;
  • the near-end device and the remote device in this embodiment may be terminals capable of real-time voice communication, such as a mobile phone, a tablet, etc., and the terminal may include a speaker for playing a voice signal; the terminal may include a microphone The microphone is for detecting a sound signal, wherein the sound signal includes a voice signal played by the speaker.
  • the near-end device, the remote device, the near-end voice signal, and the far-end voice signal described below are only relative, not absolute, for example, user A is using the mobile phone to make a voice call with user B.
  • the mobile phone used is a near-end device, and the mobile phone used by user A is a remote device, and for user A, the mobile phone used is a near-end device, and the mobile phone used by user B is a far-end device. End device.
  • the voice play module 10 plays the received far-end voice signal, and at the same time, acquires the frequency point.
  • the module 20 parses the far-end speech signal to obtain the frequency point with the most occurrences in the far-end speech signal, which is the main frequency of the human voice in the far-end speech signal, and is used as a reference frequency for subsequent echo cancellation.
  • the frequency point obtaining module 20 may include the following refinement unit:
  • the signal filtering unit 21 is configured to perform a band pass filtering process on the far end speech signal according to a preset cutoff frequency interval to obtain a vocal speech signal, wherein the preset cutoff frequency interval is a vocal frequency range;
  • the frequency point statistics unit 22 is configured to count the frequency points that occur most frequently in the voice signal.
  • the signal filtering unit 21 may perform band-pass filtering on the far-end speech signal through a band-pass filter to filter out noises other than human voices in the signal to obtain a human voice signal, so as to obtain more Precise frequency point information
  • the preset cutoff frequency interval of the band pass filter may be a range of vocal frequencies, that is, a range of sound frequencies that a person can emit, or a range of general sound frequencies when a person speaks, for example, 50-5000 Hz, or 500-5000Hz and so on. After the vocal speech signal is obtained, the frequency of occurrence of the most vocal speech signal is counted.
  • the preset cutoff frequency interval may be a cutoff frequency interval set in real time after being analyzed by the voice of the remote user.
  • the signal acquisition module 30 is configured to collect the near-end sound to form a near-end voice signal
  • the echo cancellation module 40 is configured to perform echo cancellation on the near-end speech signal according to the obtained frequency point with the most occurrences;
  • the signal sending module 50 is configured to send the echo-erased near-end voice signal to the remote device.
  • the echo cancellation module 40 performs echo cancellation on the near-end speech signal to eliminate the signal corresponding to the most frequently occurring frequency point in the near-end speech signal, for example, the band-pass filter can be used to eliminate the near-end speech signal.
  • the signal corresponding to the most frequent frequency point appears in the far-end speech signal for echo cancellation.
  • the far-end speech signal and the echo cancellation algorithm perform echo cancellation on the near-end speech signal.
  • the echo cancellation device of the voice communication further includes the following modules:
  • a determining module configured to determine whether the near-end sound collected by the near-end device includes a sound generated by playing the far-end voice signal
  • the echo cancellation module 40 is further configured to: when the sound generated by the far-end voice signal is included in the near-end sound collected by the near-end device, according to the frequency point that is obtained by the most frequently occurring frequency End speech signal for echo cancellation;
  • the signal sending module 50 is further configured to send the collected near-end voice signal to the far-end voice when the sound generated by the far-end voice signal is not included in the near-end sound collected by the near-end device End device.
  • the determining module Before performing echo cancellation, the determining module first determines whether the sound collected by the near-end device has a sound generated by the far-end speech signal played by the near-end device, for example, a spectrum image of the collected near-end speech signal and the far-end speech signal. The comparison is made to determine, and if so, the echo cancellation module 40 performs echo cancellation. If not, the signal transmission module 50 directly transmits the collected near-end speech signal to the remote device.
  • an echo cancellation mode may be set for the device.
  • the collected near-end speech signal is echo-removed, and when the echo cancellation is not required, the mode is turned off.
  • the near-end device plays the far-end voice signal, and acquires the frequency point with the most occurrences in the far-end voice signal. While the near-end device plays the above-mentioned far-end speech signal, the microphone collects the near-end sound to form a near-end speech signal, and then performs echo cancellation on the near-end speech signal according to the frequency point with the most occurrences, which will be echo-removed near.
  • the end voice signal is sent to the remote device, and since the collected near-end sound may include the sound of the far-end voice signal played by the near-end device speaker, the present invention performs echo cancellation processing on the near-end voice signal, and removes the near sound.
  • the near-end device speaker included in the end voice signal plays the sound generated by the far-end voice signal, so as to prevent the near-end device from collecting the played far-end voice signal and then transmitting it to the remote device again, forming an echo at the remote device, improving Voice quality in voice communication.
  • a second embodiment of the echo canceling apparatus for voice communication of the present invention is proposed based on the first embodiment of the echo canceling apparatus for voice communication of the present invention.
  • the device is different from the first embodiment in that the echo cancellation device of the voice communication further includes the following modules:
  • the signal determining module 60 is configured to determine whether the signal strength of the far-end speech signal is greater than the first preset signal strength, and whether the signal strength of the near-end speech signal is greater than the second preset signal strength;
  • the echo cancellation module 40 is further configured to: when the signal strength of the far-end speech signal is greater than the first preset signal strength, and the signal strength of the near-end speech signal is greater than the second preset signal strength, according to Acquiring echo cancellation of the near-end speech signal by the obtained frequency point with the most occurrences;
  • the signal sending module 50 is further configured to: when the signal strength of the far-end voice signal is less than or equal to the first preset signal strength, or the signal strength of the near-end voice signal is less than or equal to the second preset signal At the time of intensity, the collected near-end speech signal is transmitted to the remote device.
  • the signal determination module 60 can include the following elements:
  • a signal processing unit configured to perform a windowing process on the far-end speech signal, perform Fourier transform to obtain a frequency domain power spectrum of the far-end speech signal, and divide the frequency domain power spectrum into a plurality of sub-bands;
  • a signal determining unit configured to determine that a signal strength of the far-end speech signal is greater than a first preset signal strength when a power spectrum of the preset number of the sub-bands is greater than a preset threshold, otherwise, determining the The signal strength of the far end speech signal is less than the first preset signal strength.
  • the signal processing unit performs windowing processing on the far-end speech signal, such as a Hanning window, and then performs Fourier transform to convert the far-end speech signal from the time domain to the frequency domain, thereby acquiring a frequency domain power spectrum of the far-end speech signal. And dividing the frequency domain power spectrum into a plurality of sub-bands.
  • the frequency domain power spectrum is divided into 32 sub-bands, wherein the number of sub-bands can be set according to user requirements. If divided into 32 sub-bands, the power spectrum value of each sub-band can be represented by one bit, a total of 32 bits are required, and a 32-bit data type can be used to represent the frequency spectrum value of the speech signal.
  • the signal judging unit compares the power spectrum of each sub-band with a preset threshold, wherein the preset threshold and the preset number are both set by the user, preferably 10-100 db, when there is a preset number
  • a preset threshold wherein the preset threshold and the preset number are both set by the user, preferably 10-100 db, when there is a preset number
  • the power spectrum of the sub-band is greater than the preset threshold, it is determined that the signal strength of the far-end speech signal is greater than the first preset signal strength; otherwise, the signal strength of the far-end speech signal is determined to be less than the first preset signal strength.
  • the judgment of the signal strength of the near-end speech signal can be determined in the same manner as the above process, and will not be described herein.
  • the echo cancellation device for voice communication provided in this embodiment first determines the signal strength of the near-end speech signal of the far-end speech signal before performing echo cancellation, and compares the signal strengths of the far-end speech signal and the near-end speech signal. When the time is large, the echo cancellation processing is performed on the near-end signal. If the signal strength of one of the signals is weak, the impact of the echo on the call quality will be relatively small, and the echo cancellation may not be performed to save resources.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Telephone Function (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un procédé d'annulation d'écho destiné à être utilisé dans une communication vocale. Le procédé comprend les procédures suivantes consistant en : lorsqu'un appareil d'extrémité proche reçoit un signal vocal d'extrémité distante transmis par un appareil d'extrémité distante, la lecture du signal vocal d'extrémité distante reçu, et l'acquisition, à partir du signal vocal d'extrémité distante, d'un point de fréquence ayant la fréquence d'apparition maximale ; l'acquisition, par l'appareil d'extrémité proche, du son d'extrémité proche pour former un signal vocal d'extrémité proche ; et la réalisation d'une annulation d'écho sur le signal vocal d'extrémité proche selon le point de fréquence acquis ayant la fréquence d'apparition maximale, et la transmission, à l'appareil d'extrémité distante, du signal vocal d'extrémité proche ayant subi l'annulation d'écho. L'invention concerne également un dispositif d'annulation d'écho destiné à être utilisé dans une communication vocale. L'invention annule l'écho généré dans un processus de communication vocale, en améliorant ainsi la qualité de communication vocale.
PCT/CN2016/084688 2016-02-26 2016-06-03 Procédé et dispositif d'annulation d'écho à utiliser dans une communication vocale Ceased WO2017143690A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610109677.8A CN105657110B (zh) 2016-02-26 2016-02-26 语音通信的回声消除方法及装置
CN201610109677.8 2016-02-26

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Publication Number Publication Date
WO2017143690A1 true WO2017143690A1 (fr) 2017-08-31

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CN118366488A (zh) * 2024-06-14 2024-07-19 宁波菊风系统软件有限公司 一种录音系统及计算机可读存储介质

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CN112491443B (zh) * 2019-09-11 2022-10-28 瑞昱半导体股份有限公司 具有回音消除省电机制的电子系统及相关回音消除方法
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CN117238312A (zh) * 2023-08-28 2023-12-15 深蓝感知(杭州)物联科技有限公司 一种执法记录仪背景声音放大方法与系统
CN117238312B (zh) * 2023-08-28 2024-05-03 深蓝感知(杭州)物联科技有限公司 一种执法记录仪背景声音放大方法与系统
CN118366488A (zh) * 2024-06-14 2024-07-19 宁波菊风系统软件有限公司 一种录音系统及计算机可读存储介质

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