Method and apparatus for adaptively suppressing noise
First Claim
1. In a communications system for processing a communication signal comprising speech and noise components derived from speech and noise, apparatus for enhancing the quality of the communication signal comprising a processor arranged to:
- divide the communication signal into a plurality of frequency band signals including speech and noise components due to said speech and noise;
generate first power signals for the frequency band signals, each first power signal being based on estimating over a first time period the power of one of said frequency band signals;
generate second power signals for the frequency band signals, each second power signal being based on estimating over a second time period less than the first time period the power of one of said frequency band signals;
generate condition signals representing conditions of the frequency band signals in response to predetermined relationships between at least the first power signals and second power signals;
adjust the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals; and
combine the adjusted frequency band signals to generate an adjusted communication signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A processor (300) is arranged to divide a communication signal into a plurality of frequency band signals including speech and noise components due to speech and noise. The processor generates first and second power signals for the frequency band signals. Each first power signal is based on estimating over a first time period the power of one of the frequency band signals. Each second power signal is based on estimating over a second time period less than the first time period the power of one of the frequency band signals. The processor generates condition signals representing conditions of the frequency band signals, and adjusts the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals. The processor then combines the adjusted frequency band signals to generate an adjusted communication signal.
106 Citations
25 Claims
-
1. In a communications system for processing a communication signal comprising speech and noise components derived from speech and noise, apparatus for enhancing the quality of the communication signal comprising a processor arranged to:
-
divide the communication signal into a plurality of frequency band signals including speech and noise components due to said speech and noise;
generate first power signals for the frequency band signals, each first power signal being based on estimating over a first time period the power of one of said frequency band signals;
generate second power signals for the frequency band signals, each second power signal being based on estimating over a second time period less than the first time period the power of one of said frequency band signals;
generate condition signals representing conditions of the frequency band signals in response to predetermined relationships between at least the first power signals and second power signals;
adjust the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals; and
combine the adjusted frequency band signals to generate an adjusted communication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. In a communications system for processing a communication signal comprising speech and noise components derived from speech and noise, a method of enhancing the quality of the communication signal comprising:
-
dividing the communication signal into a plurality of frequency band signals including speech and noise components due to said speech and noise;
generating first power signals for the frequency band signals, each first power signal being based on estimating over a first time period the power of one of said frequency band signals;
generating second power signals for the frequency band signals, each second power signal being based on estimating over a second time period less than the first time period the power of one of said frequency band signals;
generating condition signals representing conditions of the frequency band signals in response to predetermined relationships between at least the first power signals and second power signals;
adjusting the gain of the frequency band signals in response to the condition signals to generate adjusted frequency band signals; and
combining the adjusted frequency band signals to generate an adjusted communication signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification