Dsc Communications Corporation

Frank I Yu

Kishan Shenoi

Helena S Ho

Patrick L Hanagan

An N:1 data compression system for compressing data on N DS1 trunks carrying 4N channels is disclosed. Waveform encoding circuitry is coupled to the N DS1 trunks for compressing the DS1 data into x bits and producing both encoded data and control parameters, where x.ltoreq.8. The system further includes circuitry coupled to the waveform encoding circuitry for receiving the encoded data and control parameters, performing digital speech interpolation and producing data packets which may include encoded data and control parameters that are transmittable on a single DS1 trunk.

N:1 bit compression apparatus and method

Apparatus for packing and unpacking DS1 trunks comprises a packing circuitry for receiving compressed data from a plurality of DS1 trunks, packing the compressed data into the space of one DS1 trunk, and providing a serial output of data for the packed DS1 trunk. An unpacking circuitry is further provided for receiving data from a packed DS1 trunk, unpacking the data into the space of a plurality of DS1 trunks, and providing an output thereof.

DS1 trunk packing and unpacking apparatus and method

Rudimentary digital speech interpolation apparatus for compressing data on a plurality of channels is disclosed, which includes circuitry for receiving data bits and control bits for each channel. The presence of silence on each channel is determined in response to the received data bits and zero bits are allocated for any silent channel in a frame structure. In addition, circuitry also allocates x bits per channel for the data bits in an non-silent channel in the frame. At least six bits per channel are also allocated for the control bits in the frame. 4N such frames are grouped to form a multi-frame.

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Saratoga, CA, United States of America

Frank I Yu