Sine generation circuit, phase shift circuit and tint...

Details Sine generation circuit, phase shift circuit and tint... Sine generation circuit, phase shift circuit and tint...

2005-10-04

2005-10-04

Hsia, Sherrie (Department: 2614)

Television

Image signal processing circuitry specific to television

Hue control

C348S638000

Reexamination Certificate

active

06952239

ABSTRACT:
A phase shift circuit includes a first sine generation circuit generating a sine-converted output signal (sin θ) of the phase shift input signal (θ) and a reversed sine-converted output signal (−sin θ) of the phase shift input signal (θ), a cosine generation circuit generating a cosine-converted output signal (cos θ) of the phase shift input signal (θ), a first multiplication circuit, a second multiplication circuit, a third multiplication circuit, a fourth multiplication circuit, a first addition circuit adding an output signal of the first multiplication circuit to an output signal of the second multiplication circuit, and a second addition circuit adding an output signal of the third multiplication circuit to an output signal of the fourth multiplication circuit. This configuration makes the construction of a phase shift circuit for tint adjustment simple because of a coordinate transformation embedded in the configuration.

REFERENCES:
patent: 3961362 (1976-06-01), Lovely
patent: 4797732 (1989-01-01), Aketagawa et al.
patent: 4932038 (1990-06-01), Windus
patent: 5006818 (1991-04-01), Koyama et al.
patent: 6489848 (2002-12-01), Smith et al.
patent: 6636085 (2003-10-01), Okazaki et al.
patent: 1-161907 (1989-06-01), None
patent: 2-111128 (1990-04-01), None

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