Mitigation of noise signal contrast in a digital speech interpol

Details Mitigation of noise signal contrast in a digital speech interpol Mitigation of noise signal contrast in a digital speech interpol

1980-09-16

1982-12-07

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

370113, H04J 602, H04B 162

Patent

active

043631223

ABSTRACT:
A DSI transmission system is described in which noise signal contrast is mitigated by transmitting not only active channels but also channels which carry background noise, the resolution of the background noise channels being varied in dependence upon the number of channels transmitted. In the described system, the DSI transmission is effected in superframes each of which consists of an overhead information frame and a plurality of digital message frames. The overhead information frame contains a word indicating the transmission status of each channel during the superframe, a code indicating the number of bits of each digital message, and maximum segment value information bits for each of the active channels which are transmitted using nearly instantaneous companding. Each of the remaining frames contains a digital message in respect of each active channel. Remaining space in these frames is occupied by digital messages in respect of the background noise channels, which are allocated to the frames by cyclic assignment and are transmitted using compact PCM encoding. For each superframe, active and background noise channels are determined using speech, echo, and off-hook detectors, and the number of bits of each digital message in the superframe is determined in dependence upon the total number of active and background noise channels.

REFERENCES:
patent: 3197565 (1965-07-01), Yoder et al.
patent: 3811014 (1974-05-01), Seitz
patent: 3836719 (1974-09-01), Clark
patent: 3927268 (1975-12-01), Sciulli et al.
patent: 3945002 (1976-03-01), Duttweiler et al.
patent: 3959770 (1976-05-01), Schaefer
patent: 4002841 (1977-01-01), Ching et al.
patent: 4059730 (1977-11-01), Messerschmitt et al.
"TASI fullt Gesbrachslucken", Elektro-Technik, vol. 45, No. 23, Aug. 1963, pp. 455-457.
"Digital Speech Interpolation Techniques", Campanella, 1978 National Telecomm'ns. Conf., Dec. 1978, pp. 14.1.1-14.1.5.
A Speech Predictive Encoding Communication System for Multichannel Telephony by J. A. Sciulli and S. J. Campanella, IEEE Transactions on Communications, vol. COM-21, No. 7, Jul. 1973, pp. 827-835.

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