A method to increase the field rate of a picture generated from an HDTV signal arriving in the form of a sample sequence

摘要

In a HDTV decoder the picture signal arriving in the form of a sample sequence in the format 625/2:1/5 Hz is directed to field memories, from which it is read to the sub-sampling restorer SSPC (33). The sub-sampling patterns are further supplied into three parallel signal processing branches (34, 35, 36), of which each generates a complete high definition television picture of the sub-sampling patterns. According to the invention the picture signal is directed by a controllable switch (C5) to at least four field memories (a, b, c, d). The contents of each field memory (a, b, c, d) is read to the sub-sampling restorer SSPC (33) at the double writing rate, whereby the field rate is increased to 100 Hz.