JPS62186573U - - Google Patents

Description

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, with FIG. 1 showing an overall circuit block diagram, FIG. 2 showing a specific main part circuit diagram, and FIG. 3 showing a main part signal waveform diagram. 5...First envelope detection circuit, 4...Second
Envelope detection circuit, 6... Gate circuit, 12
……comparator.

Claims (1)

[Scope of claim for utility model registration] When the reproduced FM brightness signal is input during special reproduction, the first
The first one with a long time constant that generates an envelope detection output
an envelope detection circuit; a second envelope detection circuit with a short time constant that inputs the reproduced FM luminance signal and outputs a second envelope detection output; and a dropout circuit that inputs both of the envelope detection outputs and corresponds to an exclusive OR output. a gate circuit that outputs a detection output; a clamp circuit that inputs the first envelope detection output and clamps the attenuated portion; and a comparator that inputs the clamp output;
a field memory that controls writing and reading of reproduced color video signals based on the comparator output;
A special playback circuit for a video tape recorder, comprising a selection switch for selecting the playback color video signal or the field memory output based on the comparator output.