Audio-decoder apparatus using a common circuit substrate for...

Details Audio-decoder apparatus using a common circuit substrate for... Audio-decoder apparatus using a common circuit substrate for...

2005-01-04

2005-01-04

McFadden, Susan (Department: 2655)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C704S201000, C381S022000

Reexamination Certificate

active

06839676

ABSTRACT:
In audio-decoder apparatus, a circuit substrate common to a 2-channel model and a 5.1-channel model, on which a decoder and a D/A converter with built-in PLL are installed, and which has installing portions and 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 to the input terminals of each D/A converter can be changed by a switching apparatus, 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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