| 摘要 |
PROBLEM TO BE SOLVED: To enable a calculation part to appropriately perform echo cancellation while making it easier for a user to listen to output voice from a speaker. SOLUTION: This in-vehicle handsfree device 1, when a setting value of a receiving call system amplifier 8 becomes equal to or more than a threshold interlocked with a volume setting value set by the user, performs feature extraction amplification processing by a feature extraction amplification part 12 to received voice input from a cellular phone 2 to the receiving call system amplifier 8, fixes the setting value of the receiving call system amplifier 8 to the threshold without being interlocked with the volume setting value and amplifies output power of the received voice input from the cellular phone 2 to the receiving call system amplifier 8 to output power corresponding to the threshold by the light receiving system amplifier 8. The output power of the received voice is made into a state that it is falsely amplified and output voice from the speaker 7 is prevented from being distorted. COPYRIGHT: (C)2008,JPO&INPIT
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