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1. 发明授权

US4712250A Tape player adapter for car radio 失效
标题翻译：用于汽车收音机的磁带播放器适配器
公开(公告)号：US4712250A
公开(公告)日：1987-12-08
申请号：US764786
申请日：1985-08-12
申请人： Dennis Michels , Geoff Howe , Douglas Joseph
发明人： Dennis Michels , Geoff Howe , Douglas Joseph
IPC分类号： H04H20/88 , H01Q1/50 , H04B5/00 , H04B7/14 , H04B1/34
CPC分类号： H01Q1/50 , H04B5/0006 , H04B5/0012
摘要： A portable stereo cassette tape player is connected to an FM automobile radio through an adapter having an input plug which is inserted into the audio signal output terminal of the tape player and an output plug which is inserted into the cigarette lighter receptacle of the car. The direct voltage from the car battery is filtered and connected to a frequency modulation oscillator stage in which the audio signal from the tape player frequency modulates the oscillator. The weak frequency modulated signal is coupled into the FM car radio through the cigarette lighter receptacle by stray capacitance of the wires connected to the common power source or battery and proximity to the antenna and input stage of the radio. A tuning capacitor tunes the oscillator frequency to an unused location on the dial between local FM radio stations so that the audio signal can be heard on the normal frequency modulation radio band over the radio loud speakers.
摘要翻译：便携式立体声盒式磁带播放器通过适配器连接到FM汽车收音机，适配器具有插入磁带播放机的音频信号输出端的输入插头和插入汽车的点烟器插座的输出插头。来自汽车电池的直流电压被滤波并连接到频率调制振荡器级，其中来自磁带机的音频信号对振荡器进行频率调制。弱频调制信号通过点烟器插座通过连接到公共电源或电池的电线的杂散电容并且接近无线电的天线和输入级而耦合到FM车载无线电装置中。调谐电容器将振荡器频率调谐到本地FM广播电台之间拨号盘上的未使用位置，以便可以在无线电扬声器上的正常调频无线电频段上听到音频信号。

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