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Device for generation confortable noise

A comfort noise and generator technology, applied in the field of echo cancellation equipment, can solve the problems of many hardware resources and less hardware resources, and achieve the effect of simple hardware circuit and resource saving

Inactive Publication Date: 2006-04-12
ZTE CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the comfort noise generator in the prior art occupies too many hardware resources, and propose a device for generating comfort noise that occupies few hardware resources

Method used

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Embodiment Construction

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0013] figure 1 is the schematic diagram of the device proposed by the present invention, such as figure 1 As shown, the device for generating comfort noise proposed by the present invention includes N pseudo-random sequence code generators with different generator polynomials and an N-input M-bit adder, wherein N is a natural number greater than or equal to 2, and M is greater than or equal to A natural number of 10; the output of the N pseudo-random sequence code generators is used as the input of the adder, and is added bit by bit according to the low-order alignment principle, and the high-order zeros of the less than M-bits are filled with zeros, and the lowest M-bits of more than M-bits are intercepted, The output of the adder is the comfort noise signal.

[0014] figure 2 is a schematic diagram of the preferred embodiment of the pre...

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Abstract

A device for generating comfort noise consists of N numbers of generators for generating Pseudo random sequence code with different polynomial and one adder with N input M bit as N being natural number which is equal to or greater than 2 and M being natural number which is equal to or greater than 10. It is featured as using output of said N numbers of generators as input of adder, adding up as per bit based on low bit justification rule as adding zero for high bit which is not up to M bit and cutting off lowest M bit if bit is greater than M bit to make adder output be comfort noise signal.

Description

technical field [0001] The invention relates to echo canceling equipment in the field of voice communication, in particular to a device for generating comfort noise. Background technique [0002] The comfort noise generator (comfort noise generator) is generally used in echo cancellation equipment. Its function is to generate "rustling" noise during the call to avoid the phenomenon of "dead silence", so that the caller can feel that the other party is still online. [0003] The existing comfort noise generator mainly has the following two implementation methods: 1. Use FIR filter to generate; 2. Store the noise data in a section of BUFFER in advance, read it out and output it during work, and recycle it. These two methods have a common disadvantage: the occupied hardware resources are too large. The first method not only needs two pieces of RAM (one for BUFFER and one for storing coefficients), but also hardware MAC (multiply-adder), such as US Patent No. 6711537, comfort ...

Claims

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Application Information

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IPC IPC(8): H04M9/08H04B3/20G10L19/00G10L19/012
Inventor 蔡海宁娄本刚汪爱军蔡彩珍
Owner ZTE CORP
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