发明授权
- 专利标题: Apparatus and methods for playback of color picture/sound records
- 专利标题(中): 用于播放彩色图像/声音记录的装置和方法
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申请号: US531138申请日: 1974-12-09
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公开(公告)号: US3972064A公开(公告)日: 1976-07-27
- 发明人: Eugene Orville Keizer
- 申请人: Eugene Orville Keizer
- 申请人地址: NY New York
- 专利权人: RCA Corporation
- 当前专利权人: RCA Corporation
- 当前专利权人地址: NY New York
- 优先权: UK13234/73 19730320
- 主分类号: H04N5/76
- IPC分类号: H04N5/76 ; H04N9/85
摘要:
Apparatus for use in playback of a color picture/sound disc record includes a stylus having a groove bottom engaging tip, with a conductive electrode having an exposed edge with an effective dimension along the groove which does not exceed the longitudinal dimension of the narrowest depressed groove bottom region of the disc; means for rotating the disc to cause variations in the capacitance exhibited between the stylus electrode and the disc's conductive layer; detection means responsive to the capacitive variations for deriving a train of impulses having a repetition rate varying in accordance with a first FM carrier, bearing modulation representative of luminance and chrominance information, and a duty cycle varying in accordance with a second FM carrier, bearing modulation representative of sound information; means for amplifying the impulse train; first filter means coupled to the amplifier output for selectively passing the first FM carrier and sidebands to a first FM demodulator to effect recovery of (a) the luminance and chrominance signals; and second filter means coupled to the amplifier output for selectively passing the second FM carrier and sidebands to a second FM demodulator to recover (b) the audio signals.
公开/授权文献
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