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Speech presence probability calculation method, speech presence probability calculation device and electronic equipment

A technology of occurrence probability and calculation method. It is applied in speech analysis, instruments, etc., and can solve the problems of sensitivity to parameter fluctuation and large amount of calculation.

Active Publication Date: 2017-08-01
CHINA ACAD OF TELECOMM TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the dual-microphone speech enhancement system, most of the existing methods for calculating the probability of speech occurrence have the disadvantages of large amount of calculation, sensitivity to parameter fluctuations, and not approaching zero in the speech inactive segment

Method used

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  • Speech presence probability calculation method, speech presence probability calculation device and electronic equipment
  • Speech presence probability calculation method, speech presence probability calculation device and electronic equipment
  • Speech presence probability calculation method, speech presence probability calculation device and electronic equipment

Examples

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example 1

[0131] Example 1: when the embodiment of the present invention is applied to a narrowband speech signal, k L ∈ [800, 2000] Hz, k H ∈[1500, 3000]Hz, corresponding to ξ L , ξ M , ξ H The value range is (1,20).

example 2

[0132] Example 2: The embodiment of the present invention is applied to a wideband voice signal, k L ∈ [800, 3000] Hz, k H ∈ [2500, 6000] Hz. Corresponding ξ L , ξ M , ξ H The value range is (1,20).

[0133] Then, use formula (14) to calculate the M of each frequency point SNR (n,k).

[0134] The power level difference measurement parameter M can be extracted by using formula (13) PLD .

[0135] In the extraction get the pair M SNR and M PLD After that, M′ can be obtained through nonlinear transformation processing SNR , M' PLD . A processing method of nonlinear transformation in the embodiment of the present invention, that is, normalization and piecewise linear transformation, will be introduced below. Piecewise linear transformation refers to dividing the nonlinear characteristic curve into several sections, and approximately replacing the characteristic curve with a straight line segment in each section. This processing method is also called piecewise lineariz...

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Abstract

The invention provides a speech presence probability calculation method, a speech presence probability calculation device and electronic equipment. A measurement parameter for a first channel signal signal-to-noise ratio and a measurement parameter for a signal power level difference between the first channel and a second channel are introduced in the speech presence probability calculation, the above measurement parameters are subjected to normalization and nonlinear transformation processing, a linear term and a product term of power series of the above parameters are used for fitting the speech presence probability, the computation burden for the speech presence probability can be reduced, the computation result is more robust to parameter fluctuation, and the method and the device can be widely applied to an application scene for each two-microphone speech enhancement system.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to a method, device and electronic equipment for calculating the probability of speech occurrence. Background technique [0002] During a normal voice call, the user is in a non-speaking state such as pause / listen for about 50% of the time period. The current speech enhancement system uses a voice activity detection (Voice Activity Detection, VAD) algorithm to identify speech inactive segments, and estimates and updates statistical characteristics of environmental noise in this segment. The current VAD technology mostly calculates parameters such as the zero-crossing rate or short-term energy of the time-domain waveform of the voice signal, and compares them with a predetermined threshold to make a binary decision on whether the voice is active or not. However, this simple binary judgment method often makes misjudgments (that is, judging speech segments as non-spee...

Claims

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Application Information

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IPC IPC(8): G10L25/78G10L21/0208G10L21/0216G10L25/84
CPCG10L21/0208G10L21/0216G10L25/78G10L25/84G10L21/0224G10L21/0232
Inventor 汪法兵梁民
Owner CHINA ACAD OF TELECOMM TECH
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