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1. (CN1168204) Method and apparatus for suppressing noise in communication system

Office : China
Application Number: 96191426.2 Application Date: 04.09.1996
Publication Number: 1168204 Publication Date: 17.12.1997
Grant Number: 1075692 Grant Date: 28.11.2001
Publication Kind : C
Prior PCT appl.: Application Number:PCTUS9614270 ; Publication Number:9718647 Click to see the data
IPC:
H04B 15/00
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
15
Suppression or limitation of noise or interference
CPC:
G10L 21/0208
Applicants: Motorola Inc.
摩托罗拉公司
Inventors: James P. Ashley
詹姆斯·P·阿施里
Agents: LU LIYING
中国国际贸易促进委员会专利商标事务所
Priority Data: 08556358 13.11.1995 US
Title: (EN) Method and apparatus for suppressing noise in communication system
(ZH) 通信系统中噪声抑制方法及装置
Abstract: front page image
(EN) A noise suppression system implemented in communication system provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system, as well as, generates an update by continually monitoring the deviation of spectral energy and forcing an update based on a predetermined threshold criterion. The spectral energy deviation is determined by utilizing an element which has the past values of the power spectral components exponentially weighted. The exponential weighting is a function of the current input energy, which means the higher the input signal energy the longer the exponential window. Conversely, the lower the signal energy the shorter the exponential window. The noise suppression system also inhibits a forced update during periods of continuous, non-stationary input signals (such as 'music-on-hold').
(ZH)

在通信系统(700)中实现一种噪声抑制系统(109),在诸如背景噪声电平突增期间,它提供一种改进的更新判决。另外,此噪声抑制系统(109)通过连续监视频谱能量偏差以及,根据预定阈值标准强迫更新来产生一次更新。频谱能量偏差由包含频谱功率值的指数加权部分的先前值的单元决定。指数加权是当前输入能量的函数,意思是:输入信号能量越高,指数窗口越长。反过来,信号能量越低,指数窗口越短。此噪声抑制系统(109)还防止在连续的、非固定输入信号(诸如“连续的音乐”)期间产生一强迫更新。


Also published as:
FI972852SE97016596IL119226RU02169992JP3842821 JPH10513030
CA2203917KR1019980701399AU1997017584TH33186WO/1997/018647