System for encoding and decoding amplitude modulated signals

Details System for encoding and decoding amplitude modulated signals System for encoding and decoding amplitude modulated signals

1973-07-25

1977-01-11

Wilbur, Maynard R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329123, 331 18, 358123, H04N 144

Patent

active

040028259

ABSTRACT:
A system for encoding or scrambling an amplitude modulated signal, such as the video component of a standard television signal, and for subsequently decoding or unscrambling the signal so as to restore the original message content. Encoding is achieved by shifting the phase of the carrier component relative to the phase of the side-bands by an amount sufficient to significantly distort the modulation envelope. Decoding is achieved by summing the received signal with a corrective signal having a frequency, amplitude, and phase which effectively cancels the phase-shifted carrier component and substitutes therefor a carrier component of phase and amplitude which will render intelligible the modulation envelope.

REFERENCES:
patent: 3084329 (1963-04-01), Clay
patent: 3353099 (1967-11-01), Hayasi et al.
patent: 3508154 (1970-04-01), Kermode

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