Patent EP0471517A2 successfully refreshed from Google Patents.
EP0471517A2
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Video signal recording and/or reproducing systems
Assignee: Samsung Electronics Co Ltd
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Filing: 1991-08-09
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Granted: —
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Expires: 2011-08-09
Abstract
Abstract An improved video signal recording system for recording a full bandwidth video signal on a limited bandwidth medium includes an encoder 10, coupled to an input terminal 5, for adaptively processing a composite video signal in response to a motion representative signal, and producing two signals; a luminance signal Lr, having attenuated high frequencies subsampled so as to be folded into a spectral hole in the low frequencies, and being bandwidth limited to the limited bandwidth of the recording medium, and a combined signal C+Mr including a chrominance and a motion component. Luminance signal recording circuitry 20 records the folded luminance signal on the medium, and chrominance signal recording circuitry 30 records the combined chrominance and motion signal on the medium. An improved video signal playback system for reproducing such a prerecorded video signal is also disclosed. The playback system consists of a luminance signal playback circuit 60 for retrieving the prerecorded luminance signal Lpb from the medium, and a chrominance signal playback circuit 80 for retrieving the prerecorded combined chrominance and motion signal C+M from the medium. A decoder 70 extracts the motion signal and the chrominance signal from the combined chrominance and motion signal and an unfolding circuit extracts the luminance high frequencies from the prerecorded folded luminance signal and adaptively regenerates the full bandwidth luminance signal in response to the motion signal. This regenerated full bandwidth luminance signal is combined with the chrominance signal to reproduce the originally recorded composite video signal. A recording medium previously recorded by such a recording system is capable of being played back on a standard playback system without objectionable artifacts in the reproduced image.
Inventors
- 👤 Christopher H. Strolle
- 👤 Chandrakant B. Patel
- 👤 Werner F. Wedam
- 👤 Jung-Wan Ko
- 👤 Raymond Schnitzler
- 👤 Jong-Kyung Yun
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:38
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/83; H04N9/835; G; G11; G11B; G11B20/00; G11B20/10; H04N9/797; H04N9/7976; H04N9/8205; H04N9/831; H04N9/87; H04N9/898
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
19 words
A backward compatible video signal recording system for recording a full bandwidth video signal on a limited bandwidth medium.
Claim 2
Dependent Claim
89 words
A video signal recording system according to claim 1, comprising: an input terminal (5) for receiving a composite video signal; encoding means (10), coupled to said input terminal (5), for producing a luminance signal (L r ) having attenuated high frequencies folded into low frequencies and bandwidth limited to said limited bandwidth, and a signal (C+M r ) including a chrominance component and a motion component; means (20) for recording said luminance signal (L r ); and means (30) for recording said chrominance and motion signal (C+M r ).
Claim 3
Dependent Claim
100 words
A system according to claim 2, wherein said encoding means comprises: a motion signal separator (106), coupled to said input terminal (5); an adaptive luminance signal separator (104), coupled to said motion signal separator (106) and said input terminal (5); an adaptive folding circuit (108), coupled to said adaptive luminance signal separator (104), for folding high frequencies of said luminance signal (L) into low frequencies of said luminance signal (L); a chrominance signal separator (114) coupled to said input terminal (5); and a chrominance/motion signal combiner (116), coupled to said motion signal separator (106)j and said chrominance signal separator (114).
Claim 4
Dependent Claim
47 words
A system according to claim 3, wherein said adaptive folding circuit (108) comprises: an adaptive depeaker (506); a modulator (518) coupled to said adaptive depeaker (506) circuit and responsive to a folding carrier; and a low pass fillter (510), having a passband equal to said limited bandwidth.
Claim 5
Dependent Claim
100 words
A system according to claim 4, wherein said adaptive depeaker comprises: a horizontal high pass filter (502) coupled to said luminance signal separator ( 104); a level detector (504) coupled to said horizontal high pass filter (502); a horizontal low pass filter (512) coupled to said luminance signal separator (104); and a soft switch (508) having a first data input terminal coupled to said luminance signal separator (104), a second data input terminal coupled to said horizontal low pass filter (512), a control input terminal coupled to said level detector (504) and an output terminal coupled to said modulator (518).
Claim 6
Dependent Claim
179 words
A system according to claim 4, wherein said adaptive depeaker (506) comprises: serially coupled first and second pixel time delay devices (602, 604) coupled to said luminance signal separator (104); a first adder (606) having a first input terminal coupled to said luminance signal separator (104), and a second input terminal coupled to an output terminal of said second delay device (604); a first multiplier (608) having a first input terminal coupled to an output terminal of said first adder (606); a second multiplier (612) having a first input terminal coupled to an output terminal of said first delay device (602); a second adder (610) having a first input terminal coupled to an output terminal of said first multiplier (608), a second input terminal coupled to an output terminal of said second multiplier (612), and an output terminal (615) coupled to said modulator; a look-up table (614), having an input terminal coupled to said level detector (504), and first and second output terminals (K1, K2) coupled to respective second input terminals of said first and second multipliers (608, 612).
Claim 7
Independent Claim
289 words
A system according to any of claims 2 to 6, wherein said encoding means (10) comprises: a serially coupled temporal high pass filter (204) and first horizontal high pass filter (216) coupled to said input terminal (5); a first subtractor (218) having a minuend input terminal coupled to said temporal high pass filter and a subtrahend input terminal coupled to said horizontal high pass filter (216); a magnitude detector (220) coupled to said first subtractor; a signal spreader (222) coupled to said magnitude detector, for producing a motion representative signal (M); a serially coupled vertical high pass filter (202) and horizontal high pass filter (212) coupled to said input terminal (5); a second subtractor (208) having a minuend input terminal coupled to said input terminal (5) and a subtrahend input terminal coupled to said serially coupled vertical high pass filter (202) and horizontal high pass filter (212); a third subtractor (210) having a minuend input terminal coupled to said input terminal (5) and a subtrahend input terminal coupled to said serially coupled temporal high pass filter (204) and horizontal high pass filter (216); a soft switch (214) having a first input terminal coupled to said second subtractor (208), a second input terminal coupled to said third subtractor (210), and a control input terminal coupled to said signal spreader (222), for producing a luminance signal (L); a serially coupled horizontal bandpass filter (206), chrominance signal demodulator (224) and anti-crosstalk processor (226) for producing a chrominance signal (C); an adaptive folding circuit (108) responsive to said luminance signal (L) for producing a folded luminance (L f ) signal having the same bandwidth as said limited bandwidth; and a circuit (116) for combining said chrominance and said motion representative signals (C, M).
Claim 8
Independent Claim
275 words
A system according to any of claims 2 to 6, wherein said encoding means (10) comprises: a serially coupled horizontal scan period delay device (310) and frame scan period less one horizontal scan period delay device (312); a first subtractor (314) having a subtrahend input terminal coupled to said video input terminal (5), and a minuend input terminal coupled to said horizontal scan period delay device (310); a first horizontal high pass filter (212) coupled to said first subtractor (314); a second subtractor (208) having a minuend input terminal coupled to said horizontal scan period delay device (310) and a subtrahend input terminal coupled to said first horizontal high pass filter (212), for producing a spatially derived luminance (L s ) signal; a third weighted subtractor (316) having a minuend input terminal coupled to said video input terminal (5) weighted by 1/2 and a subtrahend input terminal coupled to said frame scan period less one horizontal scan period delay device (312) weighted by -1/2; a second horizontal high pass filter (216) coupled to said third subtractor; (316) a fourth subtractor (210) having a minuend input terminal coupled to said horizontal scan period delay device (310) and a subtrahend input terminal coupled to said second horizontal high pass filter (216) for producing a temporally derived luminance signal (L T ) ; a fifth subtractor (218) having a minuend input terminal coupled to said third subtractor (316) and a subtrahend input terminal coupled to said second horizontal high pass filter (216); and a serially coupled rectifier (220), horizontal spreader (318) and vertical spreader (320) coupled to said fifth subtractor (218) for producing a motion representative signal (M).
Claim 9
Dependent Claim
114 words
A system according to claim 8, further comprising: a first multiplier (404) responsive to said temporally derived luminance signal (L T ) ; a second multiplier (408) responsive to said spatially derived luminance signal (L s ); an adder (412) having a first input terminal coupled to said first multiplier (404), a second input terminal coupled to said second multiplier (408), and an output terminal (435) for producing a luminance signal (L); and a look-up table (410) having an input terminal responsive to said motion representative signal (M), and first and second output terminals for producing scaling factors (K, 1-K) supplied to respective second input terminals of said first and second multipliers (404, 408).
Claim 10
Dependent Claim
117 words
A video signal playback system for reproducing a full bandwidth video signal previously recorded on a limited bandwidth medium, the system comprising: luminance signal playback circuitry (60) for reproducing a previously recorded limited bandwidth signal having attenuated high frequency components folded into low frequency components; chrominance signal playback circuitry (80) for reproducing a previously recorded composite signal including a chrominance signal and a motion representative signal; and decoder means (70), coupled to said luminance and chrominance signal playback circuitry (60, 80), for extracting said motion representative signal, unfolding said folded attenuated high frequency components and reproducing a full-bandwidth luminance signal; and producing a composite video signal consisting of said full bandwidth luminance signal and said chrominance signal.
Claim 11
Dependent Claim
108 words
A system according to claim 10, wherein said decoder means (70) comprises: means (802-806) for reproducing said folded luminance signal; means (808) coupled to said luminance signal reproducing means (802-806) for unfolding said luminance signal (L f *) and producing said wideband luminance signal (L*); means (812-816) for reproducing said composite signal (C+M*) including said chrominance signal and said motion representative signal; means (818), coupled to said chrominance and motion representative signal reproducing means (812-816), for producing said motion representative signal (M*) and said chrominance signal (C*); and means (810), responsive to said wideband luminance signal (L*) and said chrominance signal (C*) for producing said composite video signal.
Claim 12
Dependent Claim
188 words
A system according to claim 11, wherein said luminance signal unfolding means (808) is an adaptive unfolding circuit which comprises: a high pass filter (904) coupled to said luminance signal reproducing means (802-806) and having a passband for passing only said recorded luminance signal; a modulator (906) coupled to said high pass filter (904) and responsive to an unfolding carrier signal; a vertical low pass filter (908) coupled to said modulator; (906) an adder (902) having a first input terminal coupled to said luminance signal reproducing means (802-806) and a second input terminal coupled to said vertical low pass filter (908); a temporal low pass filter (1004) coupled to said adder (902); an adaptive spatial low pass filter ( 1006), coupled to said adder (902); a soft switch (1008) having a first data input terminal coupled to said temporal low pass filter ( 1004), a second data input terminal coupled to said adaptive spatial low pass filter (1006) and a control input terminal responsive to said motion representative signal (M*); and an adaptive peaker circuit (1010) coupled to said soft switch (1008) for producing said wideband luminance signal.
Claim 13
Dependent Claim
116 words
A system according to claim 12, wherein said adaptive peaker circuit (1010) comprises: a first horizontal high pass filter (502) coupled to said soft switch ( 1008); a level detector (504) coupled to said first horizontal high pass filter (502); a second horizontal high pass filter ≡ (512) coupled to said soft switch (1008); a second soft switch (508) having a first data input terminal coupled to said first mentioned soft switch (1008), a second data input terminal coupled to said second horizontal high pass filter ≡ (512), a control input terminal coupled to said level detector (504) and an output terminal coupled to said composite video signal generator (810) for producing said wideband luminance signal.
Claim 14
Dependent Claim
97 words
A system according to claim 12, wherein said adaptive peaker circuit (1010) comprises: a horizontal high pass filter (502) coupled to said soft switch (1008); a level detector (504) coupled to said horizontal high pass filter (502); a second soft switch (508) having a first data input terminal coupled to said first mentioned soft switch (1008), a second data input terminal coupled to said horizontal high pass filter (502), a control input terminal coupled to said level detector (504) and an output terminal coupled to said composite video signal generator (810) for producing said wideband luminance signal.
Claim 15
Dependent Claim
184 words
A system according to claim 12, wherein said adaptive peaker circuit (1010) comprises: serially coupled first and second pixel time delay devices (602, 604) coupled to said soft switch ( 1008); a first adder (606) having a first input terminal coupled to said soft switch (1008) and a second input terminal coupled to an output terminal of said second delay device (604); a first multiplier (608) having a first input terminal coupled to an output terminal of said first adder (606); a second multiplier (612) having a first input terminal coupled to an output terminal of said first delay device; (602) a second adder (615) having a first input terminal coupled to an output terminal of said first multiplier (608), a second input terminal coupled to an output terminal of said second multiplier (612), and an output terminal (615) coupled to said composite video signal generator (810); and a look-up table (614), having an input terminal coupled to a horizontal high pass filter (502), and first and second output terminals coupled to respective second input terminals of said first and second multipliers (608, 612).
Claim 16
Dependent Claim
221 words
A video signal recording and playback system for recording a full bandwidth video signal on a limited bandwidth medium and reproducing a previously recording video signal therefrom, the system comprising: an input terminal (5) for receiving a composite video signal; encoding means (10), coupled to said input terminal (5), for producing a luminance signal (L r ) having attenuated high frequencies folded into low frequencies and bandwidth limited to said limited bandwidth, and a combination signal (C+M r ) including a chrominance component and a motion representative component; means (20) for recording said luminance signal (L r ); means (30) for recording said combination signal (C+M r ); luminance signal playback circuitry (60) for reproducing a previously recorded limited bandwidth luminance signal, representing a full bandwidth luminance signal, having attenuated high frequency components folded into low frequency components; combination signal playback circuitry (80) for reproducing a previously recorded combination signal including a previously recorded chrominance signal and a previously recorded motion representative signal; and decoder means, (70) coupled to said luminance and combination signal playback circuitry (60, 80), for extracting said previously recorded motion representative signal, unfolding said folded attenuated high frequency components and reproducing said previously recorded full bandwidth luminance signal, and producing a composite video signal consisting of said full bandwidth luminance signal and said previously recorded chrominance signal.
Claim 17
Dependent Claim
26 words
A television receiver or a video recording and/or replaying apparatus provided with a video signal recording and/or playback system according to any of the preceding claims.
References Cited (Backward Citations)
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