| 摘要 |
<p>PURPOSE:To prevent a digital audio signal from being discontinuous by detecting a level of a digital audio signal so as to make a margin of a digital buffer memory close to an initial setting value. CONSTITUTION:A serial data signal 24 with deteriorated jitter being an output of a reception means 21, a bit clock 25 and a word clock 26 are inputted to a memory control means 31 and also to a level detector 38. The internal circuit of the level detector 38 compares the inputted digital audio signal with a prescribed level and the signal 24 is discriminated to be a non-audio part when the state of a prescribed level or below is consecutive for a prescribed time or over and a non-audio part detection signal 39 is outputted. Then the memory control means 31 adjusts a write signal by the input of the signal 39 to make a difference between a write address and a read address of the digital buffer memory 32 close to an initial setting value. Thus, discontinuous digital audio signal is prevented.</p> |
