Signal processing device, delay estimation method and echo cancellation method

A signal processing device and delay estimation technology, applied in speech analysis, instruments, etc.

Pending Publication Date: 2022-02-22
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] One object of the present invention is to solve the problem that there is a time delay between the reference signal and the captured signal due to different sampling frequencies, which may vary with time

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  • Signal processing device, delay estimation method and echo cancellation method
  • Signal processing device, delay estimation method and echo cancellation method
  • Signal processing device, delay estimation method and echo cancellation method

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Embodiment Construction

[0015] figure 1 is a block diagram showing a signal processing device according to an embodiment of the present invention. The signal processing device 100 can perform delay estimation, delay compensation, and echo cancellation to estimate the time delay between the reference signal and the capture signal, and compensate the echo signal and the capture signal according to the estimated time delay, respectively, using the compensated signal to perform Echo cancellation, and then effectively eliminate the echo.

[0016] The signal processing device 100 may at least include an echo estimation device 110 , a capture signal temporary storage device 120 and a delay estimation device 130 . The echo estimation device 110 is coupled to a signal supply path, and the signal supply path is also coupled to a speaker device 200 for providing the sound signal to be played through the speaker to the speaker device 200 . The echo estimation device 110 receives the sound signal from the signa...

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Abstract

The invention relates to a signal processing device comprising an echo estimation device, a capture signal temporary storage device and a delay estimation device. The echo estimation device generates an echo estimation signal according to a reference signal and a set of reflection path simulation coefficients, and compensates the echo estimation signal according to a first delay to generate a compensated echo estimation signal. The capture signal temporary storage device is used for temporarily storing the capture signal captured by the microphone device and outputting the capture signal according to the second delay so as to generate a compensated capture signal. The delay estimation device is coupled with the echo estimation device and the capture signal temporary storage device, and is used for estimating a delay adjustment amount according to the compensated echo estimation signal and the compensated capture signal, and updating the first delay or the second delay according to the delay adjustment amount. The difference between the upper limit and the lower limit of the first delay is less than or equal to 1.

Description

technical field [0001] The present invention relates to a delay estimation method and a corresponding signal processing device, in particular to a delay estimation method applied to echo cancellation. Background technique [0002] When a near-end user uses devices such as a microphone and a speaker to communicate with a remote user through the network, since the microphone receives the sound of the near-end user, it will also receive the sound played by the speaker at the same time, thus generating echo (echo) interference. Echo refers to the sound played by the speaker and reflected by the environment and received by the microphone. For applications such as Voice Over IP (Voice Over IP, VOIP for short) or Voice Recognition (VR for short), echoes and environmental noises are considered as interference factors, which will reduce the call quality or the recognition rate. Acoustic Echo Cancellation (AEC for short) is a technique for solving echo interference. [0003] The ech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0216G10L21/0264
CPCG10L21/0208G10L21/0216G10L21/0264G10L2021/02082
Inventor 吴牧谌
Owner REALTEK SEMICON CORP
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