CN1075692C

5G,4G,3G,2G

Title

Method and apparatus for suppressing noise in communication system

Application Number:

CN1996191426

Publication Date:

28-11-2001

Current Assignee:

Family ID:

Application Date:

04-09-1996

Declaring Company:

Publication Country:

US

Priority Date:

13-11-1995

Title

Method and apparatus for suppressing noise in communication system

Application Number:

CN1996191426

Family ID:

Publication Country:

US

Publication Date:

28-11-2001

Application Date:

04-09-1996

Priority Date:

13-11-1995

Current Assignee:

Declaring Company:

Abstract  Abstract

In a communication system (700) to realize a noise suppression system (109) such as during background noise level suddenly it claims an improved update decision. In addition the noise suppression system (109) by continuously monitoring the spectral energy deviation and forced update to generate a primary update according to predetermined threshold criteria. spectral energy deviation determined by unit of the previous value of exponentially weighted part comprises spectrum power value of. index weighting is a function of the current input energy meaning the input signal energy is higher the index window is longer. conversely the signal energy is lower index window is shorter. The noise suppression system (109) also prevents the continuous non-fixed input signal (such as continuous music ) generated during a forced update.

A noise suppression system (109) implemented in communication system (700) provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system (109) inter alia 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 (109) also inhibits a forced update during periods of continuous non-stationary input signals (such as music-on-hold).

A noise suppression system (109) implemented in communication system (700) provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system (109) inter alia 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 (109) also inhibits a forced update during periods of continuous non-stationary input signals (such as music-on-hold).

Note:

The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.