This paper describes a newly developed audio bit rate reduction systems for the CD-I (Compact Disc Interactive) format. The bit rate reduction system is based on the fact that the spectrum and amplitude distribution of audio signals tends to be concentrated in a certain region. We have developed an algorithm of the bit rate reduction system and built both an encoder using DSPs and a dedicated decoder LSI. The present system allows us to record and reproduce audio signals of three different bit rates to match specific applications. Level A: Audio signals whose quality is almost the same as that obtainable with compact discs, using 309 Kbits/second per channel. Level B: Audio signals of slightly lower quality than Level A, but still suitable for high-quality music, using 159 Kbits/second per channel. Level C: Audio signals for recording and reproduction of high-quality speech, using 80 Kbits/second per channel.
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