Video demodulator system

Details Video demodulator system Video demodulator system

1987-08-03

1988-08-23

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

358 23, 358188, H04N 544

Patent

active

047663910

ABSTRACT:
A demodulator system is disclosed which receives a modulated signal to be detected comprising first and second cascoded limiter stages; a phase locked loop (PLL) coupled to outputs of the second limiter stage and having a pair of outputs at which a signal representative of the modulated signal and including a voltage controlled oscillator operated at half the frequency of the modulated signal and third and fourth cascoded limiter stages; a phase shift circuit receiving the modulated signal and a double balanced demodulator receiving both the modulated signal from the phase shift circuit and the representative signal for providing a detected signal at an output thereof.

REFERENCES:
patent: 3697685 (1972-10-01), Lunn
patent: 4709408 (1987-11-01), Itakura et al.

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