| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an on-board automatic volume control device which can obtain a compensation (increase) level of an appropriate reproductive volume such that a volume feeling or bandwidth feeling is not changed during a fast travel also in a vehicle compartment of a vehicle which is being traveled. <P>SOLUTION: When a winker operation detection signal from a winker driving circuit 17 is not detected within a first given time period set to a winker timer 18, and such a signal is not detected that a control signal from a multistage comparator 16 indicates a sudden fall of a compensation amount within a second given time period set to a compensation amount timer 19, a control microcomputer 20 judges that the vehicle is fast traveling and causes an audio microcomputer 21 to control to increase a time constant of a variable time constant circuit 14 and a gain of a variable amplifier circuit 15. <P>COPYRIGHT: (C)2008,JPO&INPIT |
