发明名称 |
VIDEO RECORDING SYSTEM SIGNAL SYMMETRY CONTROL |
摘要 |
When a color television signal is recorded on a video disc and said signal is read a complication arises owing to the asymmetry which is produced in the signal by the various process steps. This gives rise to spurious components whose influence should be minimized by a suitably selected coding system. The invention proposes a device with which the influence of this asymmetry is automatically reduced. This device comprises two separator stages for supplying two sub-signals which respectively represent the rising and falling edges of the information signal. The phase relationship between these two sub-signals is controlled with the aid of a phase shifter. The control signal required for this is produced with the aid of a detector which responds to an asymmetry component in the information signal. The two corrected sub-signals are subsequently recombined to the information signal. |
申请公布号 |
AU3635078(A) |
申请公布日期 |
1979.11.29 |
申请号 |
AU19780036350 |
申请日期 |
1978.05.22 |
申请人 |
PHILIPS, N.V. GLOEILAMPENFABRIEKEN |
发明人 |
EELTJE DE BOER |
分类号 |
H04N5/93;H04N5/91;H04N9/85 |
主分类号 |
H04N5/93 |
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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