Amplitude-and-phase demodulator comprising a quantization circui

Details Amplitude-and-phase demodulator comprising a quantization circui Amplitude-and-phase demodulator comprising a quantization circui

1977-12-29

1979-01-09

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, H03D 300

Patent

active

041340752

ABSTRACT:
For a pair of detection signals derived by coherent quadrature detection from an amplitude-and-phase modulated signal, a demodulator comprises a pair of quantizer sections each of which produces a quantized signal serving as a part of a regenerated data signal, a quantization error signal, and a "first path" signal given by that portion of the quantized signal which indicates one and the other of the plus and the minus sides of the signal reference plane known in the art. The signals produced by the quantizer sections are used to control a voltage controlled oscillator for reproducing a carrier signal for use in the coherent detection. Each quantizer section may comprise at least one quantization circuit and at least one quantization error deriving subtractor. Alternatively, the quantization may be carried out in a space or a time division fashion.

REFERENCES:
patent: 3748590 (1973-07-01), Gray
patent: 3970946 (1976-07-01), Matsuo
patent: 4085378 (1978-04-01), Ryan et al.

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