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Signal processing device and signal processing method

A signal processing and equipment technology, applied in the field of signal processing equipment, can solve the problem of loud feedback from speakers to microphones, and achieve the effect of reducing the amount of resources

Inactive Publication Date: 2017-02-22
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Greater acoustic feedback from the speaker to the microphone if using the hands-free function with a normal landline or cellular phone

Method used

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  • Signal processing device and signal processing method
  • Signal processing device and signal processing method
  • Signal processing device and signal processing method

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Embodiment Construction

[0033] Embodiments of the present invention will be described below with reference to the accompanying drawings. The same elements will be assigned the same reference numerals throughout the drawings.

[0034] figure 2 The relationship between the signal processing related to the speech rate change processing and the embodiments of the present invention is shown.

[0035] The digital signal processing in this embodiment can process a predetermined number of digital values ​​as a single frame. For example, data of a sound signal may be sampled at a sampling frequency of 8 kHz, and 160 samples may be processed as one frame. In this case a frame is 20ms long. Various data processing can be performed in units of frames. Also, if a time-frequency transform is applied to data with 256 samples, it is transformed into a signal with 128 frequency bins (spectrum) in the frequency domain according to the sampling theorem. In addition, for example, Fourier transform (FFT) and invers...

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Abstract

The present invention relates to a signal processing device and a signal processing method. A signal processing apparatus that feeds a frame of a frequency domain signal of a received speech signal to an acoustic echo canceller includes: a first receiving section that receives a frame of the received speech signal in the frequency domain before speech rate changing processing; a receiving section that receives a frame of the signal in the time domain on which the speech rate changing process has been performed in units of frames; and a frequency domain frame synthesizing section that is based on the processing performed at the frame currently being processed by the signal processing device. The time domain signal after the speech rate change processing and the frame of the received speech signal in the frequency domain corresponding to the time domain signal after the speech rate change processing are synthesized into the frequency domain signal of the received speech signal frame.

Description

technical field [0001] The disclosure herein generally relates to a signal processing device and a signal processing method. Background technique [0002] A full-duplex transceiver for telephone calls (for example, a telephone) includes a microphone and speaker. In this case, if the microphone picks up the sound output from the speaker and outputs the sound from the speaker via the network, an echo may be generated. This type of echo is called a "sound echo". The process of avoiding acoustic echo is called "acoustic echo cancellation". The processing section for managing the acoustic echo canceling process is called an "acoustic echo canceller". [0003] If the hands-free function is used with a normal landline or cellular phone, the acoustic feedback from the speaker to the microphone is greater. Therefore, in order to achieve clear phone calls, it is very important to perform acoustic echo cancellation. The same is true in teleconferencing systems and the like. Acous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02G10L21/04H04M9/08
CPCG10L21/043H04M9/082G10L21/0208G10L2021/02082G10L19/012
Inventor 远藤香绪里
Owner FUJITSU LTD