HANDSFREE CIRCUIT FOR PORTABLE MOBILE PHONE

摘要

PURPOSE: A handsfree circuit for a portable mobile phone is provided to embody a handsfree function in the portable mobile phone when mounting the portable mobile phone in a vehicle. CONSTITUTION: A mounting kit(20) connects to a speaker(24) and a microphone(23). A portable mobile phone(10) embeds an audio processor(11) for connecting to the microphone(23) at its input terminal and connecting to the speaker(24) at its output terminal. If an audio signal is sensed in the input terminal, the audio processor(11) mutes a reception sound path and forms a transmission path. If the audio signal is not sensed, the audio processor(11) forms a reception path. The portable mobile phone(10) switches the transmission and reception paths according to a volume received from the mounting kit(20) and performs a handsfree function.