Video signal processing circuit and method applicable thereto
AssigneeNovatek Microelectronics Corp.
InventorHsin-I LIN
Life of this patent
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Abstract
A video signal processing circuit includes: a composite sync signal generation circuit, generating a composite sync signal from a received composite video signal; a signal-noise-ratio calculation unit, generating a SNR of the composite video signal; a timing generation unit, generating a gated window based on the SNR; and a vertical sync signal separation unit, generating a vertical sync signal from the composite sync signal based on the SNR and the gated window, and dynamically adjusting a detection criterion on the vertical sync signal.
Claims20
A video signal processing circuit, comprising:
- a composite sync signal generation circuit for generating a composite sync signal from a received composite video signal;
- a signal-to-noise ratio (SNR) calculation unit for generating an SNR of the composite video signal;
- a timing generation unit coupled to the SNR calculation unit for generating a gated window according to the SNR;
- and
- a vertical sync signal separation unit coupled to the composite sync signal generation circuit, the SNR calculation unit and the timing generation unit for generating a vertical sync signal from the composite sync signal according to the SNR and the gated window and for dynamically adjusting a detection criterion on the vertical sync signal according to the SNR.
A video signal processing method, comprising:
- generating a composite sync signal from a composite video signal;
- generating a signal-to-noise ratio SNR of the composite video signal;
- generating a gated window according to the SNR;
- generating a vertical sync signal from the composite sync signal according to the SNR and the gated window;
- and
- dynamically adjusting a detection criterion on the vertical sync signal according to the SNR.
Dependencies are inferred from the claim text.