| 摘要 |
In audio-decoder apparatus, a circuit substrate 12 common to a 2-channel model and a 5.1-channel model, on which a decoder 3 and a D/A converter 4 with built-in PLL are installed, and which has installing portions 5a and 6a for enabling installation of D/A converters without built-in PLL. The line connection modes of signal lines connecting the output terminal of the decoder 3 to the input terminals of each D/A converter can be changed by a switching apparatus 13, corresponding to the channel model, thus it becomes possible to realize D/A converters without built-in PLL having better audio performance under a line connection mode desired for an improved audio performance. Therefore, a good audio performance can be secured, while a common circuit substrate can be used for a variety of channel models, which is advantageous in view of fabrication cost.
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