| 摘要 |
PROBLEM TO BE SOLVED: To provide a volume automatic adjustment device for karaoke swing along machine to always adjust an output volume from a speaker to an optimum value regardless of a sound volume of a singer. SOLUTION: A CPU 8 compares a reference microphone sound volume received by a microphone sound volume input means 10 with a sound volume level of a sound signal received from an A/D converter 6 to control a gain of a microphone 2 so that the input sound volume level is coincident with the reference microphone sound volume. Furthermore, a sound signal and an output gain of a music signal of a sound volume adjustment circuit 3 are selected so that a ratio of the sound volume level of the sound signal from the microphone amplifier to the sound volume level of the music signal from the A/D converter 7 is coincident with a sound volume mixing ratio set by a mixing ratio input means 9. The sound volume adjustment circuit 3 conducts synthesis control according to the output gain of the vocal sound signal and the music signal sent by the CPU 8 and provides an output to a speaker 5. |
