Digital video signal recording and reproducing apparatus

Details Digital video signal recording and reproducing apparatus Digital video signal recording and reproducing apparatus

G - Physics

11

B

G11B 5/09 (2006.01) G11B 5/008 (2006.01) H04N 5/76 (2006.01) H04N 5/917 (2006.01) H04N 5/926 (2006.01) H04N 7/12 (2006.01) H04N 7/58 (2006.01) H04N 9/80 (2006.01) H04N 9/79 (2006.01)

Patent

CA 2082492

ABSTRACT OF THE DISCLOSURE A high-definition signal (HD) is separated to prevent the quality of an image from being deteriorated when the high- definition signal is mixed with a standard video signal. A low band signal of the HD signal from a decimation circuit (5) is supplied through a discrete cosine transform circuit (7), a quantizer circuit (8), a variable length coder circuit (9) and an encoder circuit (11) to a recording head (12). A signal from the quantizer circuit (8) is supplied through an inverse quantizer circuit (17) to a subtracter circuit (18). A signal from the discrete cosine transform circuit (7) is supplied to the subtracter circuit (18), thereby forming a difference signal between a decoded signal of the compresses signal and the original signal. This difference signal is supplied through a quantizer circuit (19) a run length coding circuit (20) and a variable length coder circuit (21) to an adder circuit (16). A high band signal of the HD signal from the decimation circuit (6) is supplied through a quantizer circuit (13), a run length coder circuit (14) and a variable length coder circuit (15) to the adder circuit (16). Then, a signal from the adder circuit (16) is supplied through an encoder circuit 22 to a recording head 23.

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