发明授权
US3740055A Audio reproducing apparatus for ramdom acess playback systems 失效
用于RAMDOM ACES播放系统的音频再现设备

Audio reproducing apparatus for ramdom acess playback systems
摘要:
Audio playback apparatus is disclosed including a tone arm which is positioned electromagnetically to facilitate control thereof in accordance with the position of a turntable relative to the tone arm. The apparatus is particularly suited for random access retrieval of audio information from a record including a plurality of nested spirals each corresponding to items of information on a display or selection chart. An array of switches corresponding to individual items on the display and a position selector switch assembly operated by the position of the turntable relative to the tone arm cooperate to position the stylus of the tone arm in a spiral groove corresponding to the selected portion of the display.
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