| 摘要 |
<p>PURPOSE:To reduce the scale of a hardware by preparing an intrafield in which a movement compensation is not operated for every (n) field, and operating a movement compensation prediction with the intrafield in the other fields. CONSTITUTION:When an error power is less than an original picture alternating current power, the first switch circuit 7 outputs a predictive mode signal, and when the original picture power is less than the error power, the circuit 7 outputs an intrand mode signal. That is, the circuit 7 outputs an input block or an error block as an encoded block based on the mode signal decided by a discriminating circuit 6. At that time, when the input block is the intrafield, the circuit 7 necessarily outputs the input block as the encoded block. The encoded block is inputted to a DCT circuit 8, converted into DCT coefficients, quantized into the prescribed number of bits by a quantizing circuit 9, the quantized DCT coefficients are converted into codes suited to a transmission path 11 by a first encoding circuit 10, and outputted.</p> |
