Reproducing device for recorded information
文献类型：专利
| 作者 | KOJIMA KUNIO; TERAJIMA SHIGEO; NUMATA TOMIYUKI |
| 发表日期 | 1985-11-11 |
| 专利号 | JP1985226034A |
| 著作权人 | SHARP KK |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Reproducing device for recorded information |
| 英文摘要 | PURPOSE:To eliminate automatically noise generation by detecting automatically the generation of the noise occuring in mode competition and changing further the temp. of a pickup. CONSTITUTION:The reproduced signal for the video information read by the pickup is demodulated to the composite video signal including a synchronizing signal by a demodulator 1, which signal is inputted to a band-pass filter 2 for extracting the noise component alone. The noise component is inputted to a gate circuit 3 which gates only the pedestal level section within the vertical blanking interval of the video signal and only the noise component in this section is outputted to a square-law detector 5. A gate pulse generator 4 extracts the timing in the pedestal level section from the reproduced video signal in the demodulator 1 and controls the gate circuit 3. The noise component voltage from the detector 5 is subjected to peak holding at every one field in a peak holding circuit 6, by which the noise level of the reproduced video signal is detected. Said level is compared with a reference signal level 8 which is an ordinary noise level in a comparator 7 and is made into a control signal for a temp. controller 9. |
| 公开日期 | 1985-11-11 |
| 申请日期 | 1984-04-24 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/59361]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | SHARP KK |
| 推荐引用方式 GB/T 7714 | KOJIMA KUNIO,TERAJIMA SHIGEO,NUMATA TOMIYUKI. Reproducing device for recorded information. JP1985226034A. 1985-11-11. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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