準瞬時圧伸差分符号化法を用いたハイビジョンベースバンド多重音声伝送方式

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  • Baseband Time-division Multiplexing Sound Transmission System using Near-instantaneous Companding DPCM for MUSE System HDTV
  • ジュン シュンジ アッシン サブン フゴウカホウ オ モチイタ ハイビジョン

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A new coding method called DANCE (DPCM Audio Near-Instantaneous Compressing and Expanding) is developed. It enables the transmission of four sound channels with MUSE system HDTV, of which the transmission capacity is smaller than that of the conventional Japanese satellite for TV broadcasting. Two different mode systems (mode A and mode B) are provided accoording to various types of programs. A quantized 15-bit signal is reduced to 8-bits in mode A, and a 16-bits signal to 11-bits in mode B. The sound quality of mode B is nearly equal to that of a Compact Disc's. After compressing the sound signal, independent data and error correction codes are added. The resulting sound transmission rate is 1.35 Mb/s. The serial sound bit stream is shuffled by a bit-interleaving technique to avoid the influence of burst errors. It is then converted to a ternary code. and time-compressed to multiplex into the vertical blanking period of a MUSE signal. Experimental transmission tests through a DBS, relay satellites, and CATV networks are conducted, and they show satisfactory performance.

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