Method and apparatus for carrier regeneration and synchronous am

Details Method and apparatus for carrier regeneration and synchronous am Method and apparatus for carrier regeneration and synchronous am

1979-08-21

1981-09-29

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

331 17, 331 23, 455204, H03D 100

Patent

active

042925940

ABSTRACT:
The invention relates to a method of regenerating the modulation carrier wave of an original modulated signal (SL) which has symmetrical frequency components about the carrier. A phase discriminator (D1) which receives two image signals (SL, S11) of the original signal controls the frequency of a local oscillator (OL), the frequency spectrum of one of the image signals being inverted with respect to that of the original signal and the difference in frequencies between these two image signals being twice that between the local carrier and the carrier of the original signal. Application to the synchronous demodulation of a television signal.

REFERENCES:
patent: 3577081 (1971-05-01), Schulz
patent: 3849730 (1974-11-01), Ho
patent: 4091410 (1978-05-01), Citta

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