| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice reproduction circuit where the deterioration of system performance does not occur even if the recognition of a signal source is erred or the complicated switch operation of a change-over switch circuit is executed. SOLUTION: A center level detection circuit 3 detects the level of an inputted center channel signal C (whether the input of the center channel signal C is present or absent) and outputs it to a control means 4. When the control means 4 monitors the output of the center level detection circuit 3 and the center channel signal C cannot be detected for prescribed time, reproduced L and R voice signals reproduced by a reproduction means 21 are judged not to be Dolby(R) signals and a change-over switch circuit 2 is controlled. The change- over switch circuit 2 is controlled to select regular L and R voice input sides, namely, L and R voice signal output terminal sides provided for the reproduction means 21. |
