| 摘要 |
<p>PURPOSE:To reproduce a video signal of good quality with a small amount of tape consumption, by reducing the degree of dependance on the information between frames by comparing the coding system at the recording start moment and that at other time point. CONSTITUTION:An analog input signal 1 receives an A/D conversion 2 and a coding 3 to be recorded 4 on a recording medium 5. The signal 1 is then reproduced 8 through a recording medium 7 and decoded 9 to receive a D/A conversion 10. These operations are controlled by a controller 12, and an intraframe coder 21 is selected for the first frame at the starting moment of the recording. Then an interframe coder 20 is selected at and after the following frame. Thus the degree of dependance on the information between frames is reduced. In the reproduction mode, a code is added to a part of the recorded code to discriminate the intraframe coding or the inter-frame coding. This added code is reproduced. And based on the result of this reproduction, an intraframe decoder 31 or an interframe decoder 30 is selected.</p> |
