| 摘要 |
PURPOSE:To decrease number of externally mounted components to an LSI for miniaturization and to prevent the distortion of reproduced sound by outputting a linear PCM signal obtained by the 1st means through an external terminal externally and supplying the linear PCM signal externally from other external terminal and leading the linear PCM signal to the 2nd means. CONSTITUTION:An ADPCM signal is released of coding by an ADPCM decoding circuit 104 and becomes a linear PCM signal. then the signal is outputted at the outside of an LSI 100 via a terminal 108 or fetched from the outside of the LSI 100 via a terminal 110. A switch circuit 106 selects an output signal of the ADPCM decoding circuit 104 and a signal from the terminal 110 and gives the result as an output in response to a signal supplied from an external control terminal 112. The output signal of the switch circuit 106 is a linear PCM signal and converted into a mu-law PCM signal at a PCM signal converter 114. The signal becomes an excellent sound signal without analog distortion by a mu-law PCM CODEC 118.
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