Demodulating a line locked digital color television signal

Details Demodulating a line locked digital color television signal Demodulating a line locked digital color television signal

1993-04-12

1994-10-25

Groody, James J.

Television

Image signal processing circuitry specific to television

Chrominance signal demodulator

348646, 348649, 348727, H04N 965, H04N 966

Patent

active

053593685

ABSTRACT:
A line locked digital color demodulator separates the V and U color components and the burst signal and uses a ROM for providing phase shifts to the V and U demodulation axes. During the burst time of an NTSC signal, the color component axes are shifted by 45.degree. such that the burst signal produces equal components along the axes. A correction signal is developed in response to this shifting and is used in conjunction with a frequency error signal for continuously addressing the ROM. The error signal is developed by counting the number of clock pulses over a 16 line period and comparing the number counted with a standard number for the type signal being received. The error signal is combined with the correction signal for adjusting the phase of the V and U demodulation axes. For a PAL signal, the burst is normalized to always be at 135.degree. and its components along the V and -U axes are compared as with the NTSC signal.

REFERENCES:
patent: 4612568 (1986-09-01), den Hollander et al.
patent: 4625232 (1986-11-01), Nillesen
patent: 4709257 (1987-11-01), Suzuki
patent: 4799102 (1989-01-01), Kobayashi
patent: 5025310 (1991-06-01), Sekiya et al.

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