Title:
SECAM SYSTEM RECORDING CIRCUIT
Document Type and Number:
Japanese Patent JP3115181
Kind Code:
B2
Abstract:
PURPOSE: To provide a SECAM recording circuit suppressing an amplitude at a point of times of start and end of chrominance processing without deteriorating other processing performance.
CONSTITUTION: A band pass filter 2 extracts a chroma signal from a composite video signal. The chroma signal is given to a bell filter 3, in which the amplitude is made flat and a limiter 4 amplifies the result and is given to a 1/4 frequency divider 5, where the frequency is divided into 1/4 to obtain a low frequency conversion signal. A frequency division signal is given to a gain control circuit 11. The gain control circuit 11 uses a gain control signal generated by a timing generating circuit 12 and a time constant processing circuit 13 to control the gain. The signal whose gain is controlled is given to a band pass filter 61, in which an undesired signal is eliminated. The output is given to an inverse bell filter 71, which suppresses the energy of a carrier signal. An output of the inverse bell filter 71 is outputted to an output terminal 81 as an L-SECAM chroma recording signal.
Inventors:
Akihiro Murayama
Application Number:
JP5781994A
Publication Date:
December 04, 2000
Filing Date:
March 28, 1994
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H04N9/86; (IPC1-7): H04N9/86
Domestic Patent References:
| JP151891A | ||||
| JP58221587A |
Attorney, Agent or Firm:
Saichi Suyama