Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-11-06
1999-09-28
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704264, 704215, G10C 302
Patent
active
059603895
ABSTRACT:
An improved method for generating comfort noise (CN) in a mobile terminal operating in a discontinuous transmission (DTX) mode. In one embodiment the invention provides an improved method for comfort noise generation, in which a random excitation is modified by a spectral control filter so that the frequency content of comfort noise and background noise become similar. In another embodiment the transmitter identifies speech coding parameters that are not representative of the actual background noise, and replaces the identified parameters with parameters having a median value. In this manner the non-representative parameters do not skew the result of an averaging operation.
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Paksoy, E. et al., "Variable Bit-Rate Celp Coding of Speech With Phonetic Classification (1)", European Transactions On Telecommunications And Related Technologies, vol. 5, No. 5, Sep. 1994, pp. 57-67.
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"European Digital Cellular Telecommunications Systems (Phase 2); Comfort Noise Aspect For Full Rate Speech Traffic Channels (GSM 06.12)" European Telecommunication Standard, Sep. 1994, pp. 1-10.
"European Digital Cellular Telecommunications System; Half Rate Speech Part 5; Discontinuous Transmission (DTX) For Half Rate Speech Traffic Channels", European Telecommunication Standard, vol. 300 581-5, pp. 1-3,5,7-16, Nov. 1, 1995.
Jarvinen Kari
Kapanen Pekka
Rotola-Pukkila Jani
Ruoppila Vesa
Abebe Daniel
Hudspeth David R.
Nokia Mobile Phones Limited
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