Integrated cellular telephone and vehicular audio system
    4.
    发明授权
    Integrated cellular telephone and vehicular audio system 失效
    集成蜂窝电话和车载音频系统

    公开(公告)号:US5243640A

    公开(公告)日:1993-09-07

    申请号:US756254

    申请日:1991-09-06

    IPC分类号: H04B1/20 H04M1/60

    CPC分类号: H04B1/205 H04M1/6041

    摘要: An output transducer and amplifier are shared between an audio system and a cellular Phone in an automotive vehicle. An interface arbitrates between the program audio signals and the phone audio signals to select or deselect each of the audio signals depending on the status of each audio source. When only one source is in use then normally the audio signals from that source are selected. If both sources are turned on but a phone call is not in progress, then audio signals from both sources are simultaneously presented to the output transducers after summing. When a call is in progress, only the phone audio signals are selected.