Method and apparatus for providing comfort noise in communication system with discontinuous transmission
First Claim
1. In a communication system for use in connection with an audio signal comprising interspersed speech present periods and silent periods, wherein said system comprises a transmitter and receiver at opposing sides of a signal transmission interface, and wherein said transmitter is disposed to transmit said audio signal to said receiver during said speech present periods and to discontinue transmission thereof during said silent periods, apparatus for providing comfort noise comprising:
- a comfort noise generator at said receiver side of said interface for producing comfort noise of adjustable amplitude;
a first subsystem responsive to said silent periods for notifying said receiver to activate said generator when said transmitter discontinues transmission of said voice signal; and
a second subsystem for transmitting a succession of amplitude parameters through said interface to selectively adjust the amplitude of said comfort noise generator in corresponding relationship with a noise level at said transmitter.
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Accused Products
Abstract
In a voice communication system having a transmitter and receiver on opposing sides of an interface, the transmitter is switched on to transmit speech components and is switched off during speech pauses. To provide comfort noise at the receiver, and thus avoid annoying effects caused by continual switching of the transmitter, a comfort noise generator disposed to produce comfort noise of an adjustable amplitude is located on the receiver side of the interface. A first subsystem responsive to operation of the transmitter provides a flag to the receiver to commence operation of the comfort noise generator, when the transmitter discontinues transmission in response to a speech pause. A second subsystem transmits a succession of amplitude parameters through the interface to selectively adjust the amplitude of the generator in corresponding relationship with a noise level at the transmitter.
20 Citations
19 Claims
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1. In a communication system for use in connection with an audio signal comprising interspersed speech present periods and silent periods, wherein said system comprises a transmitter and receiver at opposing sides of a signal transmission interface, and wherein said transmitter is disposed to transmit said audio signal to said receiver during said speech present periods and to discontinue transmission thereof during said silent periods, apparatus for providing comfort noise comprising:
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a comfort noise generator at said receiver side of said interface for producing comfort noise of adjustable amplitude;
a first subsystem responsive to said silent periods for notifying said receiver to activate said generator when said transmitter discontinues transmission of said voice signal; and
a second subsystem for transmitting a succession of amplitude parameters through said interface to selectively adjust the amplitude of said comfort noise generator in corresponding relationship with a noise level at said transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a communication system for use in connection with an audio signal comprising interspersed speech present periods and silent periods, wherein said system comprises a transmitter and receiver at opposing sides of a signal transmission interface, and wherein said transmitter is disposed to transmit said audio signal to said receiver during said speech present periods and to discontinue transmission thereof during said silent periods, a method for providing comfort noise comprising the steps of:
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operating a comfort noise generator to produce comfort noise of adjustable amplitude at said receiver side of said interface;
notifying said receiver to activate said generator in response to occurrence of one of said silent periods; and
transmitting a succession of amplitude parameters through said interface to selectively adjust the amplitude of said comfort noise generator in corresponding relationship with a noise level at said transmitter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification