Apparatus and method for calibrating audio-visual signal
AssigneeMStar Semiconductor, Inc.
InventorsWen Chieh Yang, Ching Fu Lan, Jen Hsing Wang, Yi Hsuan Lai, Chin Fu Ho, Hsin Chuan Kuo, You Tsai Cheng, Tai Lai Tung
Life of this patent
Estimating the term…
Abstract
An apparatus for calibrating an audio-visual (AV) signal includes a controller for generating a control signal, a controllable filter for selectively filtering the AV signal in response to the control signal to output either the AV signal or a filtered AV signal; and a calibrator for generating a group of calibrating coefficients according to the filtered AV signal and calibrating the AV signal according to the group of calibrating coefficients.
Claims17
An apparatus for calibrating a baseband audio-visual (AV) signal, comprising:
- a controller, for generating a control signal;
- a controllable filter, for selectively filtering the baseband AV signal in response to the control signal to selectively output the baseband AV signal and a filtered baseband AV signal;
- and
- a calibrator, for generating a group of calibrating coefficients recursively according to the in-phase and quadrature imbalances of the amplitude and phase of the video portion of the filtered baseband AV signal, and thereafter, changing the state of the control signal and calibrating the baseband AV signal according to the group of calibrating coefficients.
A method, for calibrating a baseband AV signal, comprising:
- providing a control signal;
- selectively filtering the baseband AV signal in response to the control signal, and outputting either the baseband AV signal or a filtered baseband AV signal;
- and
- generating a group of calibrating coefficients recursively according to the in-phase and quadrature imbalances of the amplitude and phase of the video portion of the filtered baseband AV signal, and thereafter, changing the state of the control signal and calibrating the baseband AV signal according to the group of calibrating coefficients.
Dependencies are inferred from the claim text.