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Noise power estimation method

A noise power and power technology, applied in the field of noise suppression, can solve the problems of complex operation process, large storage resources, slow tracking of non-stationary noise, etc., and achieve the effect of simple operation and small storage resource occupation.

Inactive Publication Date: 2014-03-19
TSINGHUA UNIV +1
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Problems solved by technology

However, this method is mainly based on the posterior signal-to-noise ratio for noise power estimation, and it is slow to track non-stationary noise, often requiring a delay of 0.5s to 1.5s
At the same time, this method needs to save the noise power of each frequency point in multiple frames in the past, which requires complex calculation process and large storage resources

Method used

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Embodiment Construction

[0041] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0042] In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.

[0043] figure 1 A flowchart of the noise estimation method based on optimal...

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Abstract

The invention discloses a noise power estimation method. The method comprises the steps of first sampling input noisy voices to obtain input noisy voice signal sampling points, framing the sampling points chronologically and obtaining a series of analysis frames; then based on noisy voice signal sampling points in a current analysis frame, calculating a maximum normalized autocorrelation value of the current analysis frame, noisy voice power and a posteriori signal to noise ratio of each frequency point in the current analysis frame, and a voice presence probability of each frequency point in the current analysis frame; and finally, based on a noise power estimated value of each frequency point in a previous analysis frame, and the noisy voice power and the voice presence probability of each frequency point in the current analysis frame, calculating a noise power estimated value of each frequency point in the current analysis frame. The noise power estimation method is simple in operation and small in storage resource occupation, and is capable of quickly estimating the power of all kinds of noise.

Description

technical field [0001] The present invention relates to the technical field of noise suppression, in particular to a method for estimating noise power. Background technique [0002] Voice is often interfered by various noises during communication, such as environmental noise and line noise. The existence of noise will not only affect the quality of communication, but also seriously interfere with the extraction of parameters in low-rate speech coding and reduce the quality of synthesized speech. For the field of speech recognition, the existence of noise will greatly reduce the accuracy of recognition, making it difficult to achieve satisfactory results in the practical process of speech recognition. It can be seen that noise suppression has a great impact and far-reaching significance on the fields of speech communication, speech coding, speech recognition and so on. Although the current noise suppression algorithm can suppress the noise to a certain extent, it often dama...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216G10L21/02
Inventor 徐敬德崔慧娟唐昆许科
Owner TSINGHUA UNIV
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