| 摘要 |
High-frequency portions of the video signals are substantially damped at low signal levels by including, selectively, a low-pass filter (12) in circuit with a signal path, selectively, in accordance with the setting of a transfer switch (13), the setting of which is controlled as a function of the signal level with respect to a threshold (USt), which may vary, for example in accordance with amplification of a signal being received from a television camera tube system (1,2,3).
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