| 摘要 |
An equalization circuit for a reproduced video signal detects the levels of a reference signal in two different frequency bands and, based on a comparison of the detected levels, selects an equalization curve from a memory and controls the equalization characteristic of an equalizer in the signal path based on the selected equalization curve. For a video frequency signal, low-pass and high-pass filters provide the two frequency bands for level checking and for a radio frequency signal two bandpass filters provide the frequency bands of interest located above and below the center color carrier frequency. A memory contains a number of equalization curves, one of which is selected based upon a comparison using the detected reference signal levels that is performed in a central processing unit.
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