Method of demodulating multi-standard TV signals and a circuit d

Details Method of demodulating multi-standard TV signals and a circuit d Method of demodulating multi-standard TV signals and a circuit d

1990-07-09

1992-03-10

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358188, 3581911, 329316, 329348, 329323, 329358, 455188, 455209, H04N 965, H04N 544

Patent

active

050953630

ABSTRACT:
A method of demodulating multi-standard TV signals consists of providing a plurality of signals at a frequency which is a multiple of a reference frequency whose value is a common submultiple of the frequencies of the multi-standard signals. Thereafter, the signal to be demodulated is multiplied by one of said plural signals having a frequency which differs therefrom by a value equal to the reference frequency; by filtering the result of the multiplication, a signal is obtained at the reference frequency but corresponding in amplitude to the one to be demodulated.

REFERENCES:
patent: 4551756 (1985-11-01), Ogawa et al.
patent: 4758794 (1988-07-01), Ogawa

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