| 摘要 |
In a DAVT HD-MAC system using 80ms, 40ms and 20ms coding branches, in the 80ms branch, instead of taking one quarter of the samples from each of four fields or all the samples from one field in four, half the samples are taken from half the fields, considered in pairs. The information is described as derived from a sequential image co-timed with one field and is transmitted in two adjacent fields. A "spot-wobble" technique due to estimated motion vectors may be employed. The new signal is compatible with first-generation DATV receivers while providing an improved picture on second-generation DATV receivers. <IMAGE> |
