US5659622A

5G,4G,3G,2G

Title

Method and apparatus for suppressing noise in a communication system

Application Number:

US19950556358

Publication Date:

19-08-1997

Current Assignee:

GOOGLE INC

Family ID:

24221022

Application Date:

13-11-1995

Publication Country:

US

View on Espacenet

Priority Date:

13-11-1995

Declaring Company:

MOTOROLA INC

Abstract  Abstract

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 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 also inhibits a forced update during periods of continuous non-stationary input signals (such as music-on-hold).

Note:

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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.

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