Digital multi-line companded delta modulator

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

1976-06-30

1977-11-22

Murray, Richard

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340347AD, H04B 100

Patent

active

040598004

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 types. 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 hardware 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 as single bit delta bit modulation in the above environment.

REFERENCES:
patent: 3745562 (1973-07-01), Rosenbaum
patent: 3895377 (1975-07-01), Schwalenstocker
patent: 3956746 (1976-05-01), Lisle, Jr. et al.

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