Pulse amplitude modulator

Details Pulse amplitude modulator Pulse amplitude modulator

1975-06-24

1976-05-25

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9T, H03K 1322

Patent

active

039597458

ABSTRACT:
A pulse amplitude modulator which has particular utility in analog-to-digl and digital-to-analog converters of the continuous variable slope delta (CVSD) modulation type. A CVSD analog-to-digital modulator first compares an incoming analog signal with a synthesized signal. The error signal is periodically sampled, with the output of the sampler being a clocked binary signal having the same polarity as the error signal. This binary signal, which is the output signal for the CVSD modulator, is simultaneously tested for patterns of similar bits and utilized to correct the amplitude of the synthesized signal in the pulse amplitude modulator. The pulse amplitude modulator utilizes C-MOS transmission gates and filter circuitry to synthesize a digital signal which, when integrated, approximates the analog input signal.

REFERENCES:
patent: 3500205 (1970-03-01), Tudor-Owen
patent: 3500441 (1970-03-01), Brolin
patent: 3506917 (1970-04-01), Bond
patent: 3555423 (1971-01-01), Weston
patent: 3699566 (1972-10-01), Schindler
patent: 3723909 (1973-03-01), Condon
patent: 3727135 (1973-04-01), Holzer
patent: 3761841 (1973-09-01), Jacquart
patent: 3815033 (1974-06-01), Tewksbury
patent: 3878465 (1975-04-01), Stephenne
patent: 3879663 (1975-04-01), McGrogan, Jr.

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