Digital synchronous detectors using time division for extracting

Details Digital synchronous detectors using time division for extracting Digital synchronous detectors using time division for extracting

1978-01-17

1979-03-20

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 325349, 325423, 329122, 329136, 329178, H03D 100, H03D 320

Patent

active

041456637

ABSTRACT:
The detector is provided with an input control circuit supplied with a first input for extracting a carrier wave from a modulated wave and a second input for demodulating the modulated wave and controlled to produce the first and second inputs on the time division basis, a reference wave generating circuit which produces a sine wave or a cosine wave as a reference wave and produces amplitude values corresponding to designated phases, and a time division multiplying circuit which multiplies the outputs of the input control circuit with the amplitude values on the time division basis for producing the demodulated signal. There are further provided circuit means for deriving out a variable control quantity from the output of the multiplying circuit and a phase designating circuit including an adder for adding together a phase designating value at a preceding sampling time, a constant signal value and the variable control quantity at each sampling time of the modulated wave, and a memory for storing the result of addition as a new phase designating value which is applied to the reference wave generating circuit.

REFERENCES:
patent: 3603890 (1971-09-01), Camenzind et al.
patent: 3768030 (1973-10-01), Brown et al.

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