Method for designing de-emphasis circuit for video signal...

Details Method for designing de-emphasis circuit for video signal... Method for designing de-emphasis circuit for video signal...

2007-02-06

2007-02-06

Groody, James J. (Department: 2621)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000, C348S710000

Reexamination Certificate

active

09832199

ABSTRACT:
In a de-emphasis circuit designing method for minimizing the number of peripheral components of a video signal processing integrated circuit (IC), a circuit device for determining the level of a reproduced video signal of the de-emphasis circuit is included in the video signal processing IC. The number of components is reduced by designing all circuit elements of the circuit device for determining the level of the reproduced video signal of the de-emphasis circuit so that they are incorporated into the video signal processing IC at the time of design of the video signal processing IC, thereby reducing cost and reducing any deviation in the playback (PB) level due to external component deviation. The video signal processing IC comprises the de-emphasis circuit and a video level setting unit, the latter comprising an amplifier connected to an output of the de-emphasis circuit, a plurality of resistance elements, and a plurality of respective switches for ON/OFF switching of the resistance elements, thereby setting the gain of the amplifier and the level of the reproduced video signal.

REFERENCES:
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patent: 5323242 (1994-06-01), Yamamoto et al.
patent: 5872605 (1999-02-01), Nonaka et al.
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An article “A Single Chip Y/C Signal Processing IC for VHS VCRS” written by Kawano, et al., published in IEEE Transactions on Consumer Electronics, vol. 35, No. 4, pp. 741-747 on Nov. 1989.

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