Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
An apparatus for recording a digital video signal comprising: (a) band-separating means (3, 4) for separating a digital high- definition video signal formed at a predetermined bit rate to provide a high band signal and a low band signal; (b) signal compressing means (7, 8) for compressing a bit rate of said low band signal so that said low band signal becomes equivalent to a standard digital video signal; (c) difference signal forming means (18) for forming a difference signal between a signal, which results from restoring said compressed signal, and said low band signal; (d) coding means (13, 14, 15, 16, 19, 20, 21) for coding said low band signal and a synthesized signal of said difference signal and said high band signal so that a bit rate of a synthesized signal becomes a bit rate of said standard digital video signal; and (e) recording means (22, 23) for recording said coded low band signal and said coded synthesized signal on separate tracks on a magnetic tape.
Claim 2
Dependent Claim
19 words
The apparatus according to claim 1, wherein said signal compressing means (7, 8, 9) comprises an orthogonal converting means.
Claim 3
Dependent Claim
22 words
The apparatus according to claim 2, wherein said orthogonal converting means (7, 8, 9) comprises a discrete cosine transform (DCT) circuit (7).
Claim 4
Dependent Claim
23 words
The apparatus according to claim 2 or 3, wherein said signal compressing means further comprises quantizing means (8) and variable length coding means.
Claim 5
Independent Claim
22 words
The apparatus according to any one of claims 1 to 4, wherein said coding means comprises run length coding means (14, 2).
Claim 6
Dependent Claim
23 words
The apparatus according to claim 5, wherein said coding means further comprises quantizing means (13, 19) and variable length coding means (15, 21).
Claim 7
Independent Claim
22 words
The apparatus according to any one of claims 1 to 6, wherein said band-separating means (3, 4) is a vertical subband filter.
Claim 8
Independent Claim
44 words
The apparatus according to any one of claims 1 to 7, wherein said difference signal forming means subtracts an output of an/said orthogonal converting means and an inverse quantized output of a/the quantized output of said orthogonal converting means to form said difference signal.
Claim 9
Independent Claim
56 words
The apparatus according to any one of claims 1 to 7, wherein said difference signal forming means (18) subtracts said low band signal and a signal, which results from inversely converting (7') said low band signal after said low band signal was compressed by said signal compressing means (7, 8) , to form said difference signal.
Claim 10
Independent Claim
277 words
An apparatus for recording and reproducing a digital video signal comprising: (a) band-separating means (3, 4) for separating a digital high- definition video signal formed at a predetermined bit rate to provide a high band signal and a low band signal; (b) signal compressing means (7, 8) for compressing a bit rate of said low band signal so that said low band signal becomes equivalent to a standard digital video signal; (c) difference signal forming means (18) for forming a difference signal between a signal, which results from restoring said compressed signal,and said low band signal; (d) coding means (13, 14, 15, 16, 19, 20, 21) for coding said low band signal and a synthesized signal of said difference signal and said high band signal so that a bit rate of a synthesized signal becomes a bit rate of said standard digital video signal; (e) recording means (22, 23) for recording said coded low band signal and said coded synthesized signal on separate tracks on a magnetic tape; (f) reproducing means (36, 37) for reproducing said low band signal and said synthesized signal from said magnetic tape; (g) decoding means (38, 39, 40, 45, 46, 47) for decoding said reproduced synthesized signal to provide said difference signal and said high band signal; (h) first synthesizing means (35) for synthesizing said reproduced low band signal and said difference signal; (i) signal expanding means (41, 42) for inversely converting an output of said synthesizing means; and (j) second synthesizing means (44) for synthesizing an output of said signal expanding means (41, 42) and said reproduced high band signal from said decoding means to provide said digital high-definition video signal.