| 摘要 |
An integrated mobile-phone handsfree kit combined with an existing vehicular stereo system utilizes the high power and high performance audio output characteristics to provide drivers with a safe, comfortable and high quality conversation environment in vehicle. The invention comprises an existing stereo equipment with loudspeakers, and an electric power module connected to the stereo equipment to share the same power supply. The stereo equipment has a sound output wire and an electric power supply input wire. The electric power module has a handsfree kit electric circuit assembly. The handsfree kit electric circuit assembly has a sound source selecting switch unit, a power amplifier, an earphone circuit, an audio fidelity processing unit, an electric power supply unit, a sound source control unit, and an electric power supply switch. The invention makes it possible to integrate the mobile-phone handsfree kit together with a vehicular stereo system to automatically detect the sound source(from stereo or mobile-phone) and then direct the audio signal to the loudspeaker output, and therefore simplifies wiring and eliminates the needs for extra power source and loudspeakers. The integrated handsfree kit also controls the loudspeakers in different locations by applying various output powers and phase delays for each loudspeaker in order to process the audio signal and simulate the sound fields as if the sound were coming from the front to allow drivers to concentrate on traffic while in conversation via mobile-phone.
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