| 发明名称 |
RECORDER AND PLAYBACK APPARATUS FOR PULSE WIDTH MODULATED RECORD |
| 摘要 |
An information record comprises a tape containing the information, which may be audio information, as width modulation of periodic depth variations extending generally across the tape. An information playback unit illuminates the tape and detects the information which is contained in light diffracted by the tape. |
| 申请公布号 |
US3688025(A) |
申请公布日期 |
1972.08.29 |
| 申请号 |
USD3688025 |
申请日期 |
1970.10.27 |
| 申请人 |
RCA CORP. |
发明人 |
MAURICE JAMES WHITTEMORE JR. |
| 分类号 |
G11B7/003;G11B7/007;G11B7/12;G11B7/125;G11B7/14;H04N5/76;(IPC1-7):G11B11/18;H04N5/86 |
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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