Data compression using nearly instantaneous companding in a digi

Details Data compression using nearly instantaneous companding in a digi Data compression using nearly instantaneous companding in a digi

1976-01-21

1977-01-11

Stewart, David L.

179 15BW, H04J 602

Patent

active

040028410

ABSTRACT:
A digital speech interpolation (DSI) system advantageously utilizes speech inactivity time to reduce the bit rate by compressing digital characters from a plurality of trunks onto a lesser plurality of channels. A signaling arrangement is typically employed therein to signal a receiver as to the activity of a trunk. If the number of active trunks exceeds the number of channels, an overload may exist. Known arrangements for mitigating overload typically include apparatus responsive to an activity signal for truncating one or more bits from the digital characters and for transmitting the truncated characters. Unfortunately, quantization noise is increased and digital precision decreased in such arrangements. The hereindisclosed system includes an improved automatically adaptive arrangement for advantageously incorporating nearly instantaneous companding (NIC) and priority trunk rotation in a plurality of frames, called a multiframe. Thereby, a mitigation of overload as well as a lessening of quantization noise relative to known DSI arrangements is attained.

REFERENCES:
patent: 3811014 (1974-05-01), Seitz
patent: 3927268 (1975-12-01), Sciulli
patent: 3945002 (1976-03-01), Duttweiler
Alta Frequenza, vol. XLIII, No. 9, Sept. 1974; "Use of Digital Speech Interpolation..." by Poretti et al.
IEEE Transactions on Communications, Sept. 1974, "Speech Interpolation..." by Lyghounis et al.

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