Multi-channel frequency converter having automatic control

Details Multi-channel frequency converter having automatic control Multi-channel frequency converter having automatic control

1974-11-14

1976-03-16

Mayer, Albert J.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325442, 325453, 325457, 329122, 329137, H04B 116

Patent

active

039449319

ABSTRACT:
A device for frequency-converting multi-channel broadcast signals consists of a local oscillator for generating at a time a single oscillation frequency, a mixer and a frequency discriminator for automatically controlling the oscillation frequency of the local oscillator. The frequency discriminator delivers a dc zero voltage when the frequencies of plural signals applied to the discriminator coincide with those of the carrier waves of the frequency-converted multi-channel broadcast signals. If the frequencies of the plural signals applied to the discriminator differ from those of the carrier waves, the discriminator delivers a dc output voltage whose amplitude depends upon the difference.

REFERENCES:
patent: 3328700 (1967-06-01), Chipman
patent: 3697885 (1972-10-01), Avins et al.

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