Apparatus for minimizing signal degradation during the copying of video signals from one recording medium to another recording medium

A dubbing apparatus, comprising:

• means for separating an ID code from a video signal retrieved from a recordable medium, the separated video signal being frequency demodulated into a composite video signal;
• means for outputting said composite video signal while simultaneously separating a synchronizing signal therefrom, the separated synchronizing signal being inputted to a decoder;
• a differential phase shift keying demodulator for demodulating said ID code separated by said separating means;
• means for outputting the demodulated ID code to an output terminal;
• means for inputting recording information and the outputted demodulated ID code to a switch which selectively forwards either the demodulated ID code or the inputted recording information to said decoder, an output of said decoder being inputted to a system controller that functions to revise said recording information when said recording information is outputted by said decoder;
• means for inputting a composite video signal to a frequency modulator while simultaneously separating a synchronizing signal therefrom;
• means for encoding the revised recording information from said system controller;
• means for differential phase shift key modulating a signal outputted from said encoding means;
• means for synthesizing a signal from said differential phase shift key modulating means and a frequency modulated signal that is outputted from said composite video signal inputting means;
• and
• means for storing the synthesized signal in said recordable medium.

A dubbing apparatus, comprising:

• an operation switch for selectively inputting revising data;
• a switch that receives inputted recording information and a demodulated recording signal, said switch selectively outputting either said demodulated recording signal or said inputted recording information;
• a decoder that decodes said output of the switch;
• a system controller that revises said inputted recording information outputted from said decoder when said switch outputs said inputted recording information;
• a display that displays said demodulated recording signal when said switch outputs said demodulated recording signal, and which displays said revising data when said switch outputs said inputted recording information;
• an encoder for encoding said inputted recording information that has been revised by said system controller;
• a recording information modulating circuit for modulating the encoded recording information;
• a frequency modulation circuit for frequency modulating a composite video signal to be dubbed;
• a synthesizing circuit for multiplex modulating the modulated encoded recording information and the frequency modulated composite video signal to form a multiplexed signal;
• and
• a recorder that records said multiplexed signal onto a recording medium.