Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-09-08
2000-08-01
Kuntz, Curtis A.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455570, 455550, H04Q 720
Patent
active
060979461
ABSTRACT:
The present invention relates to a method, arrangement and apparatus for splitting signalling and speech in a signal stream in a telephone system including analog mobile communications, wherein the signalling and the speech are transmitted on the same communications channel. The method comprises steps of arranging the signalling into frames included within the signal stream to be transmitted from a mobile station to a mobile telephone exchange, evaluating acoustic noise during the transmission, monitoring the signal stream by a modem of an exchange of the system so as to detect frames including signalling bit sequences, splitting the signal stream into a signalling part and speech part during the transmission of the signal stream on basis of said monitoring by the modem, and generating comfort noise into the cut areas of the signal stream on basis of said evaluation so as to fill in those areas of the speech part which are cut off from the signal stream during the splitting.
REFERENCES:
patent: 5809018 (1998-09-01), Lehmusto
patent: 5835486 (1998-11-01), Davis et al.
WO 91/02436; Knight et al.; Cellular Radio System, Feb. 1991.
ETSI Specification 06.32, "Voice Activity Detection," Jul. 7, 1989, Version 3.0.0.
ETSI Specification 06.31, "Discontinous Transmission (DTX) for full-rate speech traffic channels," Mar. 1990, Version 3.1.0.
NMT DOC.900-1: Automatic Cellular Mobile Telephone System, Nordic NMT-900, System description, Jan. 1985.
Kuntz Curtis A.
Ramakrishnaiah Melur
Telefonaktiebolaget LM Ericsson
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