发明授权
- 专利标题: Digital flutter reduction system
- 专利标题(中): 数字减震系统
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申请号: US560855申请日: 1975-03-21
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公开(公告)号: US3938184A公开(公告)日: 1976-02-10
- 发明人: Richard E. DeFrancesco , Bernard Harris , David Hoffman
- 申请人: Richard E. DeFrancesco , Bernard Harris , David Hoffman
- 申请人地址: DC Washington
- 专利权人: The United States of America as represented by the Secretary of the Navy
- 当前专利权人: The United States of America as represented by the Secretary of the Navy
- 当前专利权人地址: DC Washington
- 主分类号: H03K5/1534
- IPC分类号: H03K5/1534 ; G11B5/09
摘要:
A digital flutter reduction system which corrects for a varying time base ror in FM recordings on magnetic tape. Pulse transitions from the outputs of a reference oscillator and a reference tone on a first tape track are compared by a flip-flop whose output is a pulse having a width corresponding to the time base error. The output pulse enables a first counter to provide a digital output which is loaded into a second counter. Pulse transitions from a second tape track containing recorded data advance the second counter over a number of counts indicative of a correction factor. The pulse transitions of the recorded data are delayed in accordance with the correction factor thereby reducing the time base error.
公开/授权文献
- US5687690A Motor vehicle drive device 公开/授权日:1997-11-18