| 摘要 |
PROBLEM TO BE SOLVED: To control the r.p.m. of a cooling fan depending on the strength of a voice signal because the power of a voice output circuit for driving a speaker varies as the volume varies and thereby the heat generation value varies depending on the volume. SOLUTION: The cooler for an audio system 1 comprising a voice output circuit 2 and a speaker 3 is provided with a control means 4 outputting a control signal proportional to the output from the voice output circuit 2, and a drive circuit 5 for controlling the r.p.m. of the motor 6 of a cooling fan 7 based on the signal from the control means 4. |
