Phase correction circuit, signal discrimination circuit, phase correction method and signal discrimination method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYoshihiro Inada, Shinji Yamashita
Life of this patent
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Abstract
An absolute-value difference arithmetic section obtains an absolute-value difference from a first component and a second component. A component discriminating section or a signal discriminating section (circuit) discriminates an inputted chroma signal by phase discrimination and distance discrimination using the absolute-value difference. A correction executing section corrects the phase of the inputted chroma signal using the absolute-value difference. The absolute-value difference arithmetic section is formed by an adder and/or a subtracter on a small circuit scale.
Claims19
A phase correction circuit for correcting a phase of a signal, wherein said signal is represented on a vector diagram of an orthogonal coordinate system having first and second coordinate axes by a signal vector having a first component on said first coordinate axis and a second component on said second coordinate axis,
- said phase correction circuit comprising:
- an absolute-value difference arithmetic section for obtaining an absolute-value difference corresponding to a difference between an absolute value of said first component and that of said second component;
- and
- a correction executing section for correcting said phase of said signal using said absolute-value difference, wherein
- said correction executing section includes:
- a correction amount arithmetic section for multiplying said absolute-value difference by a correction coefficient to obtain a correction amount;
- and
- a correction signal generating section for correcting said phase of said signal using said correction amount and said first and second components.
A signal discriminating circuit for discriminating a signal, wherein
- said signal is represented on a vector diagram of an orthogonal coordinate system having first and second coordinate axes by a signal vector having a first component on said first coordinate axis and a second component on said second coordinate axis,
- said signal discrimination circuit comprising:
- an absolute-value difference arithmetic section for obtaining an absolute-value difference corresponding to a difference between an absolute value of said first component and that of said second component;
- and
- a component discriminating section for executing signal discrimination as to whether or not said first and second components of said signal are present within a predetermined range using said absolute-value difference.
A signal discrimination method of discriminating a signal, wherein
- said signal is represented on a vector diagram of an orthogonal coordinate system having first and second coordinate axes by a signal vector having a first component on said first coordinate axis and a second component on said second coordinate axis,
- said signal discrimination method comprising the steps of:
- (a) obtaining an absolute-value difference corresponding to a difference between an absolute value of said first component and that of said second component;
- and
- (b) executing signal discrimination as to whether or not said first and second components of said signal are present within a predetermined range using said absolute-value difference.
Dependencies are inferred from the claim text.