发明名称 |
Modulated sound reading system |
摘要 |
A motion picture sound reading system employing a light emitting diode source which is modulated at a carrier frequency several times higher than the highest sound-track frequency for exciting the optical sound track and a carrier-demodulation signal processing system for deriving a high-quality audio signal from the photoelectrically detected optical sound track.
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申请公布号 |
US4085296(A) |
申请公布日期 |
1978.04.18 |
申请号 |
US19750642308 |
申请日期 |
1975.12.19 |
申请人 |
INTERNATIONAL AUDIO VISUAL, INC. |
发明人 |
KEEGAN, PAT |
分类号 |
G11B7/003;G11B7/13;G11B7/135;G11B20/02;G11B20/24;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/003 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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