| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve audibility for audio sound and information presentation sound when both of them are simultaneously outputted. Ž<P>SOLUTION: A DSP 13 determines whether or not a pure tone band of audio sound signals outputted from an audio device 11 and a pure tone band of information presentation sound signals outputted from a navigation system 12 are overlapped. If they are not overlapped, the DSP 13 attenuates sound volume of the frequency band of either audio sound signals or information presentation sound signals corresponding to the pure tone band of the other of audio sound signals or information presentation sound signals. Then, the audio sound signals and the information presentation sound signals are synthesized, and sound-outputted from a speaker 15. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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