Digital PAL color television signal demodulators

Details Digital PAL color television signal demodulators Digital PAL color television signal demodulators

1984-02-01

1986-08-12

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 14, H04N 965, H04N 966, H04N 1118

Patent

active

046059539

ABSTRACT:
A digital PAL color television signal demodulator for demodulating the U and V color component signals from an input chrominance signal derived from a PAL color television signal which has been digitized by being sampled a predetermined number of times per horizontal line comprises a first memory storing values representing the phases of the sub-carrier signal, on which the U and V color component signals have been modulated, at the first sample position of each of the successive lines of four fields of the television signal, a second memory storing values representing the relative phases of successive sample positions along a horizontal line, means for deriving from the memories values representing the phases of successive sample positions of each of the successive samples in eight fields of the television signal, means to derive from the values derived from the memories quadrature amplitude values of the sub-carrier in synchronism with a sample frequency of the input chrominance signal, and multipliers and low-pass filters for demodulating the input chrominance signal with each of the quadrature amplitude values of the sub-carriers and for deriving the U and V color component signals.

REFERENCES:
patent: 4349833 (1982-09-01), Clarke
"Digital PAL Decoding Using Line--Locked Sampling", C. K. P. Clarke, Brighton Conference: International Broadcasting Convention (Sep. 20-23, 1980), pp. 199-202.

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