Method of broadcasting an encoded video signal and a receiving a

Details Method of broadcasting an encoded video signal and a receiving a Method of broadcasting an encoded video signal and a receiving a

1984-02-23

1986-09-23

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358121, 358122, 358123, H04N 7167

Patent

active

046139028

ABSTRACT:
A video signal is encoded prior to broadcasting by inverting portions of the signal about an encoding axis at a predetermined reference level. To enable the reference level to be determined accurately after the received signal has been recorded and played back using a VTR having a noise reduction circuit, two identification signals having the same level are included in two consecutive horizontal periods of the signal, respectively. The level of the identification signal in the second horizontal period is unaffected by the noise reduction circuit. A decoding circuit detects the level of that identification signal and uses it to generate a decoding axis having the reference level. The decoding circuit at the receiver is thus able to accurately restore the encoded signal by reinverting the inverted portions about a decoding axis having the same level as the encoding axis.

REFERENCES:
patent: 3919462 (1975-11-01), Hartung et al.
patent: 4257065 (1981-03-01), Papay
patent: 4511919 (1985-04-01), Forgey et al.

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