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Speech signal processing device and speech signal processing method

A voice signal processing and voice signal technology, applied in voice analysis, instruments, etc., can solve the problems of signal distortion, distortion, signal signal distortion, etc., and achieve the effect of improving phase mismatch

Active Publication Date: 2019-08-06
ACER INC
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Problems solved by technology

Since the characteristics of the sound signal are relatively close to the sine wave, if the interpolated signal value is calculated by the general arithmetic mean method, the signal after frequency reduction will often be distorted.
In addition, the existing technology does not consider whether the phases of the signal frames are matched when performing the overlapping action of the signal frame. Therefore, a part of the signal will be added and a part of the signal will be subtracted at the overlap, which will cause signal distortion. The greater the frequency reduction, the more serious the distortion will be

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  • Speech signal processing device and speech signal processing method
  • Speech signal processing device and speech signal processing method
  • Speech signal processing device and speech signal processing method

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Embodiment Construction

[0050] figure 1 Shown as a schematic structural diagram of a speech signal processing device according to an embodiment of the present invention, please refer to figure 1 . The speech signal processing device includes a processing unit 102 and a sampling unit 104, the processing unit 102 is coupled to the sampling unit 104, wherein the processing unit 102 can be implemented as a central processing unit, and the sampling unit 104 can be implemented as a logic circuit, otherwise This is the limit. The sampling unit 104 can sample the original speech signal S1 to generate a sampled speech signal S2. The processing unit 102 may down-sample the speech signal S2 to generate a down-converted signal comprising a sequence of down-converted signal frames, figure 2 A schematic diagram of signal processing of a sampled speech signal shown as an embodiment of the present invention, such as figure 2 As shown, the sampled speech signal S2 may include a sequence of sampled signal frames...

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Abstract

The invention provides a voice signal processing device and a voice signal processing method. The voice signal processing method comprises steps of determining a first sampling point matched with a sampling point phase corresponding to a phase reference sampling point number in a mth original frequency down-conversion signal frame according to a phase reference sampling point serial number corresponding to a middle sampling point between a (m-1)th original frequency down-conversion signal frame and a (m-1)th updating frequency down-conversion signal frame, taking q continuous sampling points starting from the first sampling point as sampling points of a mth updating frequency down-conversion signal frame in order to effectively improve a signal distortion condition which is caused by a fact that the phase is not matched when the signal frames are overlapped when further frequency down-conversion is performed on a sampling voice signal (like reducing the frequency to 1 / 4).

Description

technical field [0001] The present invention relates to a signal processing device, and in particular to a voice signal processing device and a voice signal processing method. Background technique [0002] Generally, hearing-impaired people often cannot clearly receive higher-frequency speech signals, such as consonant signals, but can clearly hear low-frequency signals. Generally, the prior art solves this problem by reducing the frequency of the high-frequency voice signal and overlapping the signal frames. After the signal is down-frequency, since the time length becomes longer, the signal value between two consecutive sampling signals needs to be obtained by means of interpolation. Since the characteristics of the sound signal are relatively close to the sine wave, if the interpolated signal value is obtained by the general arithmetic mean method, the signal after frequency reduction will often be distorted. In addition, the existing technology does not consider whethe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/007
Inventor 杜博仁张嘉仁曾凯盟
Owner ACER INC
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