Television – Image signal processing circuitry specific to television – Color killer
Patent
1994-03-15
1997-08-26
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Color killer
348644, 348679, H04N 970
Patent
active
056615302
ABSTRACT:
A television circuit (10) according to the invention includes a multiplier (12), and a voltage signal (V1) is outputted from an LPF (22) in accordance with the presence or absence of a color burst signal which is to be inputted to the multiplier (12). A rectangular-wave signal (Va) is obtained on the basis of the voltage signal (V1) through a peak holding circuit (24) and a sampling/holding circuit (42). A rectangular-wave signal (Vc) is obtained by averaging the rectangular-wave signal (Va) and a rectangular-wave signal (Vb) which is obtained by delaying the signal (Va) by a 1H delay circuit (44) by an adder (46) and a 1/2 multiplication circuit (48). On the basis of the rectangular-wave signal (Vc), a voltage signal (V3) is produced by an LPF (52) having a relatively small time constant, which is compared with a reference voltage (Vref) by a level-comparator (54), whereby a signal is outputted. The signal is used as a color killer signal for a color killer circuit, for example.
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IEEE Transactions of Broadcasting, vol. 38, No. 1, Mar. 1992, New York (US) pp. 19-26; Douglas W. Irwin et al. `Hybrid Clamping in NTSC Digital Video Equipment`.
European Search Report (Date of Completion: Feb. 27, 1995).
Honda Fumiaki
Hosoya Nobukazu
Kostak Victor R.
Sanyo Electric Co,. Ltd.
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