| 摘要 |
A method for modulating a video input signal received into a modulation circuit is disclosed. A first step of the method generally comprises (A) during a first modulation pass, generating (i) a primary frame by inserting a plurality of primary synchronization codes into the video input signal, (ii) a secondary frame by inserting a plurality of secondary synchronization codes into the video input signal, (iii) a plurality of first values and a first digital sum value both for the primary frame and (iv) a plurality of second values and a second digital sum value both for the secondary frame. A second step of the method generally comprises (B) during a second modulation pass, generating a video output signal presented from the modulation circuit by modulating the video input signal using one set of (i) the first values and (ii) the second values as determined by the first digital sum value relative to the second digital sum value.
|
