Recording/ reproducing apparatus and input/ output device

In a recording/reproducing apparatus having a converter which converts a first analog video signal into a digital signal;

• a compressor which compresses the converted digital signal;
• a recorder which records the compressed signal on a recording media;
• a reproducer which reproduces the digital signal from the recording media;
• and an expander which expands the compressed signal, said apparatus having a recording/reproducing digital mode and an analog mode for recording/reproducing said first analog video signal in the state of an analog signal, the improvement comprising:
• a converter which converts a digital signal which is at least one of compressed and expanded into a second analog video signal;
• and
• a switcher which switches said first analog video signal before it is encoded and said second analog video signal, whereby an output analog video signal is displayed in a picture display device;
• and
• wherein the improvement further comprises:
• a detector which detects data, which is superimposed over a vertical blanking period and is deleted from the first analog video signal in the process of at least one of compression and expansion, at an upstream side of the compressor which compresses the converted digital signal;
• a superimposer which encodes and superimposes said detected data over said compressed signal;
• a processor which extracts said superimposed data;
• and
• an adder which adds the extracted data to the signal expanded by the expander, whereby the output obtained from said adder is applied to said converter which produces said second analog signal.

In a recording/reproducing apparatus having an AD converter which converts an input analog video signal into a digital signal;

• a compressor which compresses the output of said AD converter;
• a recorder which records the output of said compressor on a recording media;
• a reproducer which reproduces a digital signal from said recording media;
• an expander which expands the output of said reproducer;
• and a DA converter which converts the output of said expander into analog video signal, the improvement comprising:
• a detector which detects first copy guard data superimposed over a vertical blanking period of said input analog video signal and second copy guard data superimposed over a color burst signal;
• and
• an adder which adds said two copy guard data detected by said detector to the output of said expander, whereby the output of said compressor is fed to said expander in modes other than a reproducing mode by said reproducer.

An input/output device comprising:

• an AD converter which converts an input analog video signal into a digital signal;
• a compressor which compresses the output of said AD converter to produce a compressed signal;
• an expander which expands the compressed signal;
• and a DA converter which converts the output of said expander into an analog video signal, wherein the output of said compressor is fed to said expander;
• and further comprising:
• a detector which detects first copy guard data superimposed over a vertical blanking period of said input analog video signal and second copy guard data superimposed over a color burst signal;
• and
• an adder which adds said first and second copy guard data detected by said detector to the output of said expander.