Digital multi-line companded delta modulator

Details Digital multi-line companded delta modulator Digital multi-line companded delta modulator

H - Electricity

04

B

179/2, 354/69

H04B 1/00 (2006.01) H04B 14/06 (2006.01)

Patent

CA 1102002

ABSTRACT A companded digital delta modulator which can encode both voice and voice band modem signals over a wide range of input levels is shown. The companding method or algorithm is based on measuring bit stream correlation and can be scaled to give substantially maximum performance over a wide range of signal tones. The algorithm has a low sensitivity to digital channel errors, thus making it suitable for signal coding for satellite channels and the like. In addition, the digital design permits common hard- ware to simultaneously serve a large number of lines, thus permitting the substantial savings in the hardware cost per line. A further aspect of the invention concerns the ability to handle multiple bit delta modulation as well ?s single bit delta bit modulation in the above environment.

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