| 摘要 |
<p>A compressed data system, which sends digital motion pictures over a limited-bandwidth transmission channel, comprises a digitally-controlled pre-processor and a digitally-controlled post-processor. The digitally-controlled pre-processor is effective in reducing the content bandwidth of the content of an original frame, applied to a compression encoder, in response to a first digital control signal, being indicative of the fact that the bandwidth of compressed data would exceed channel bandwidth. Further, the pre-processor derives one or more digital control values of a second digital control signal communicated over the transmission channel without ever being compressed, directly to the digitally-controlled post-processor. The post-processor is capable of employing the control values to the synthetic extension of the spatial-frequency bandwidth of the content of communicated compressed motion picture frame by an amount which results in the restoration to the bandwidth of the original frames. Permits either an increase the number of frames per second that can be communicated over the channel, no decrease in the level of quantization in response to the occurrence of excessive spatial information.</p> |
