| 摘要 |
PURPOSE:To obtain an inexpensive and high quality television(TV) subscription broadcasting decoder capable of using a MUSE signal obtained after descrambling subscription broadcasting as a normal non-scrambled MUSE signal. CONSTITUTION:This subscription broadcasting decoder has a sound/image descrambling unit 6, a scramble flag erasing/master frame discriminating flag bit shifting device 143, a MUSE sound re-encoding device and a multiplexing device 50 for encoding processing sound data with a video signal. In such constitution, a scrambled sound data bit stream is descrambled, a scramble flag is erased, a master frame discriminating flag bit is shifted to another sound frame, MUSE signal sound re-encoding processing is executed, and during the vertical blanking of a MUSE signal including a descrambled video signal, remultiplexing is executed, so that a MUSE signal obtained after descrambling subscription broadcasting can be used equivalently to a normal non-scrambled MUSE signal. |
