THOMSON VP2750 Technical Manual page 93

DETAIL ENHANCEMENT, PRE-EMPHASIS
The luminance signal applied to Pin 26 is sent to the detail enhancement circuit. This circuit
amplifies high-frequency, low-level signals. This circuit is active in Record Mode only.
It then arrives at the non-linear pre-emphasis circuit. Pre-emphasis also increases high-
frequency, low-level signals.
Signal Y then arrives at the main pre-emphasis stage. This pre-emphasis amplifies high-
frequency signals whatever their level. Excessively large transients created by the pre-
emphasis circuits are clipped by the white and dark clipping stages. This prevents any
excessively large variations at the FM modulator output.
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