Priori signal-to-noise ratio estimation method, device and noise inhibition method based on Kalman

A priori SNR and a posteriori SNR technology, applied in the field of communication, can solve the problem of slow tracking speed of artificial noise MusicalTone, and achieve the effect of ensuring the tracking speed

Active Publication Date: 2015-05-06
SHANGHAI LINKCHIP SEMICON TECH CO LTD
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Problems solved by technology

[0027] The purpose of the present invention is to provide a priori signal-to-noise ratio estimation method, device and noise suppression method based on Kalman filter, to solve the problem that artificial noise Musical Tone or tracking speed will be too slow in the existing noise suppression scheme

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  • Priori signal-to-noise ratio estimation method, device and noise inhibition method based on Kalman
  • Priori signal-to-noise ratio estimation method, device and noise inhibition method based on Kalman
  • Priori signal-to-noise ratio estimation method, device and noise inhibition method based on Kalman

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[0075] The Kalman filter-based priori signal-to-noise ratio estimation method, device and noise suppression method provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form, and are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention.

[0076] Please refer to figure 2 , which is a schematic flowchart of a method for estimating a priori signal-to-noise ratio based on a Kalman filter according to an embodiment of the present invention. Such as figure 2 As shown, the prior SNR estimation method includes:

[0077] S20: Predict the prior SNR of the current frame;

[0078] S21: Obtain the new information of the current frame;

[0079] S22: Obtai...

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Abstract

The invention provides a priori signal-to-noise ratio estimation method, device and noise inhibition method based on a Kalman filter. The priori signal-to-noise ratio estimation method comprising predicting a priori signal-to-noise ratio of a current frame, obtaining an innovation of the current frame, obtaining weighting factors of the innovation and estimating the priori signal-to-noise ratio of the current frame according to the predicted priori signal-to-noise ratio of the current frame, the innovation and the weighting factors. According to the priori signal-to-noise ratio estimation method, device and noise inhibition method based on the Kalman filter, at the time of pure noise, the occurrence of man-made noise musical tone can be avoided. At the time, tracking velocity can be ensured and weak voice signals can be protected under a low signal-to-noise ratio.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a priori signal-to-noise ratio estimation method and device based on a Kalman filter and a noise suppression method. Background technique [0002] Speech signal is an important medium for human beings to disseminate information and communicate emotions. However, in the process of voice communication, it is inevitably subject to interference from the surrounding environment and even other speakers. These interferences eventually make the received voice signal not a pure original voice signal. Instead, it is a noisy speech signal contaminated by noise. During voice communication, noise is the main cause of making communication difficult. [0003] Noise Suppression (NS) technology can help reduce the adverse effects of noise. Its goal is to increase the signal-to-noise ratio (SNR) and thus speech intelligibility, reduce listener effort, and improve the perceived qua...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0216
Inventor 谢单辉王彦王威许云峰
Owner SHANGHAI LINKCHIP SEMICON TECH CO LTD
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