GB2249451A - A circuit for folding the high frequency component of a luminance signal - Google Patents
A circuit for folding the high frequency component of a luminance signal Download PDFInfo
- Publication number
- GB2249451A GB2249451A GB9112036A GB9112036A GB2249451A GB 2249451 A GB2249451 A GB 2249451A GB 9112036 A GB9112036 A GB 9112036A GB 9112036 A GB9112036 A GB 9112036A GB 2249451 A GB2249451 A GB 2249451A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- luminance signal
- frequency
- luminance
- video signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/02—Analogue recording or reproducing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/797—Processing of colour television signals in connection with recording for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal
- H04N9/7976—Processing of colour television signals in connection with recording for recording the signal in a plurality of channels, the bandwidth of each channel being less than the bandwidth of the signal by spectrum folding of the high frequency components of the luminance signal
Abstract
A video signal folding circuit and unfolding circuit include a second path for processing the luminance signal distributed in the limited bandwidth of a recording medium, which is added to a first path for folding the full bandwidth luminance signal, so that the luminance signal distributed in the limited frequency band is recorded and reproduced together with the folded luminance signal on a record medium. Thus, there is an advantage in that the resolution of the VCR of the present invention is identical with that of the standard VHS VCR, when being compatible with the standard VHS VCR. <IMAGE>
Description
1 0 2 24 94 31 CIRCUIT FOR FOLDING AND UNFOLDING VIDEO SIGNAL The present
invention relates to a video recording ard playback apparatus using a frequency folding technique to record lots of video information, and more particularly to a frequency folding and unfolding circuit for expanding a bandwidth of a base video signal limited by frequency folding up to the limited bandwidth of a record medium.
Current home VCRs record video signals onto video tape cassettes in one of several formats. The well-known VHS system produces degraded picture quality chiefly because there is insufficient horizontal resolution.
Generally, an enhanced VHS system, called Super VHS (hereinafter, referred to as --VHS), produces enhanced picture quality by recording a full bandwidth video signal on the video tape cassette, thus yielding improved picture quality. Such a system requires higher quality tape in the cassette, and higher quality recording mechanisms, playback mechanisms and circuitry. However, the S-VHS system is not reverse compatible with standard VHS VCRs. Although a S-VHS VCR can play back cassettes recorded on either S-VHS or standard VHS VCRs, a standard VHS VCR cannot playback cassettes recorded on S-VHS VCRs. There is an enhanced video recording and reproducing apparatus disclosed in U.S. patent application no. 07-569029 filed by Samsung Electronics Co. of Korea on August 17, 1990. This video 1 recording and reproducing apparatus can record a wider bandwidth video signal than that recorded by the standard VHS VCR on a standard quality cassette, and also maintain compatibility with the standard VHS VCR which has been a problem with the S-VHS VCR, and does not require a high quality recording and reproducing apparatus. According -.1o, the U.S. patent application no. 07-569029, during a recording, high frequency components of a luminance signal are attenuated, and the attenuated high frequency components are folded with low frequency components by a subNycuist sampling, and the folded signal is filtered. All of the informat4l on existing on the full bandwidth luminance signal is included in the folded luminance signal of aDprcximately 2.5 MHz bandwidth. And, during reproduction, to unfold all of the information existing in the full bandwidth lum-Inance signal included in the folded luminance signal of approximately 2.5 MHz bandwidth to the original band, the reproduced luminance signal is filtered by a low-pass filter having a cut-off frequency of approximately 2. 5 MH_-, and the filtered luminance signal is unfolded to be distributed in the original frequency band. Conclusively, the invention disclosed in the U.S. patent application no. 07-569029 processes the luminance signal within 2.5 MHz during the recording and the reproducing.
However, the standard VHS VCR can record and reproduce the luminance signal within approximately 3 MHZ on the videc 1) tape cassette. Thus, when a video taoe cassette recorded by the VCR disclosed in the U.S-. patent application no. 07569029 is played back by a standard VHS VCR, video information distributed in the frequency band above 2.5 MHz is lost. Also, when a video tape cassette recorded by the standard VHS VCR is played back by the VCR disclosed in the U.S. patent application no. 07-569029, the video information distributed in the frequency band above 2.5 MHz is lost.
Accordingly, it is an object of the present invention to provide a video signal folding and unfolding circuit which can expand the frequency band of recorded and reproduced video signals te the limited bandwidth of a record medium tc prevent a loss of high frequency luminance signal while being compatible with a standard VHS VCR.
To achieve the object, a video signal folding circ;uit of the present invention comprises:
an A-D converter for converting a full bandwidth video signal to a multibit digital video signal; a luminance signal separator for separating a full bandwidth luminance signal from the digital video signal; a frequency folder for folding a high frequency luminance signal of the full bandwidth luminance signal into limited low frequency luminance signal, thereby producing limited bandwidth folded luminance signal; 3 an adder for adding the limited bandwidth folded luminance signal and the full bandwidth luminance signal; a D-A converter for converting the added digital luminance signal into an analog signal; a luminance signal recorder for modulating an output of the D-A converter to be recorded on the record med4;um; and a recording element for recording an output of the luminance signal recorder on the record medium.
To achieve the object, a video signal unfolding circuit of the present invention comprises:
a read out element for reading out information recorded on a record medium; a luminance signal reproducer for demodulating the information read out by the read out element to reproduce the luminance signal; an A-D converter for converting the reproduced luminance signal into a digital luminance signal; a frequency unfolder for unfolding the high frequency luminance signal folded with the limited low frequency luminance signal of said digital luminance signal, to the original occupJed band; and 4 an adder for adding outputs of the frequency unfolder and the A-D converter.
The above object and other advantages of the present invention will become more apparent by describing the preferred embodiment of the present invention with reference to the attached drawings, in which:
FIG.1 is a block diagram of an embodiment of a video signal folding circuit according to the present invention; FIGS.2A to 2E are output characteristic diagrams for the respective parts of the circuit shown in FIG.1; FIG.3 is a block diagram of another embediment of a video signal unfolding circuit according to the present invention; and FIGS.4A to 4G are output characteristic diagrams for the respective parts of the circuit shown in FIG.3.
FIG.1 is a block diagram of an embodiment of a video signal folding circuit according to the present invention. Referring to FIG.1, an input terminal 5 is connected to a video signal source (not shown) to receive a composite video signal CV, and also is connected to an input terminal of an A-D converter 10. An output terminal of the A-D converter 10 is connected to input terminals of a luminance signal separator 20, a motion signal separator 22, and a chrominance signal separator 21. An output terminal of the luminance signal separator 20 is connected to input terminals of the frequency folder 30 and a low-pass filter 40. Output terminals of the frequency folder 30 and the low pass filter 40 are connected to first and second input terminals of an adder 50, respectively. An output terminal of the adder 50 is connected to an input terminal of a D-A converter 11, whose output terminal is connected to an input terminal of a luminance signal recorder 60. An output terminal of the luminance signal recorder 60 is connected to a first input terminal of a chrominance/luminance signal mixer 71. An output terminal of the chrominance signal separator 21 is connected to a first input terminal of a chrominance /motion signal mixer 70. An output tarminal of the motion signal separator 22 is connected to a control terminal of the luminance signal separator 20 and a second input terminal of the chrominance /motion siGnal mixer 70.
An output terminal of the chrominance /motion signal mixer is connected to an input terminal of the D-A converter 12. An output terminal of the D-A converter 12 is connected to an input terminal of a standard chrominance signal recorder 80. An output terminal of the standard chrominance signal recorder 80 is connected to a second input terminal of the chrominance / luminance signal mixer 71. An output terminal of the chrominance / luminance signal mixer 71 is connected to a magnetic recording head 90.
FIGS.2A to 2E are operational characteristic diagrams 6 for the respective parts of the circuit shown in FIG.1. FIG.2A is an output characteristic diagram of a luminance signal separator 20, and FIG. 2B is an operational characteristic diagram of the frequency folder 30 when a frequency is folded, and FIG.2C is an output characteristic diagram of the frequency folder 30, and FIG.2D is an output characteristic diagram of a low-pass filter 40, and FIG.2E is an output characteristic diagram of an adder 50.
The operation of the circuit shown in FIG.1 is described in connection with the characteristic diagrams shown in FIGS.2A to 2E. The A-D converter 10 samples a composite video signal CV by a sampling clock of approximately 10 MHzz, and codes the sampled produce a digital composite video signal DCV. signal separator 22 separates a motion signal M the moved amount of pixels of a picture from composite video signal DCV.
signal to -ion The mal. representing the digital The luminance signal separator 20 separates a spatially derived luminance signal and a temporally derived luminance signal from the digital composite video signal DCV, and suitably combines these two luminance signals according to the value of the motion signal, thereby producing a luminance signal L. At this time, the luminance signal L has a bandwidth such as in FIG.2A.
7 The chrominance signal separator 21 separates a chrominance signal C from the digital composite video signal DCV.
After attenuating high frequency components ( luminance signal above 2.5 MHz) of the luminance signal L, the frequency folder 30 folds the high frequency luminance signal into a low frequency luminance signal, as shown in FIG.2B, by a subNyquist sampling, and then low-pass filters the folded luminance signal to have a high frequency cut-off characteristic at 2.5 MHz, thereby producing a folded luminance signal L as shown -in FIG.2C. The low-pass filter 40 removes high frequency luminance components above 3 MHz in the luminance signal L to produce a baseband luminance signal BL distributed within the limited bandwidth 3MH-- o-F a video cassette tape, as shown in FIG.2D. The adder 50 adds the folded luminance signal L distributed in the limited band to the baseband luminance signal BL, thereby producing a luminance signal BL+L as shown in FIG.2E. The D-A converter 11 converts the digital luminance signal BL+L added in the adder 50 into an analog signal. The luminance signal recorder 60 frequency-modulates the analog luminance signal BL+L generated in the D-A converter 11 to be recorded on a recording medium. The chrominance / motion signal mixer 70 mixes the motion signal and the chrominance signal to supply the mixed signal C+M to the D-A converter 12. The D-A converter 12 converts the mixed digital 8 chrominance signal C+M to an analog signal. The standard chrominance signal recorder 80 amplitude-modulates the chrominance signal C+M received from the D-A converter 12 by approximately 629 MHz. The chrominance / mixer 71 mixes the frequency-modulated a carrier wave of luminance signal luminance signal and the amplitude modulated chrominance signal to supply the mixed signal to the magnetic recording head 90. The magnetic recording head 90 records the output of the chrominance / luminance signal mixer 71 on a video tape cassette.
FIG.3 is a block diagram of another embodiment of a video signal unfolding circuit according to the present invention. Referring to FIG.3, a magnetic reproducing head 100 is connected to an input terminal of a chrominance luminance signal separator 110. A first output terminal of the chrominance / luminance signal separator 110 is connected to an input terminal of a luminance signal reproducer 120, and also a second output terminal of the chrominance / luminance signal separator 110 is connected to an input terminal of a standard chrominance signal reproducer 170. An output terminal of the luminance signal reproducer 120 is connected to an input terminal of an A-D converter 130. An output terminal of the A-D converter is connected to input terminals of a low-pass filter and a baseband processor 141. An output terminal of the pass filter 140 is connected to an input terminal of 9 140 1 cw the frequency unfolder 150. An output terminal of the frequency unfolder 150 is connected to a first input terminal of an adder 160. An output terminal of the baseband processor 141 is connected to a second input terminal of the adder 160. An output terminal of the adder 160 is connected to an input terminal of a D-A converter 132. An output terminal of the D-A converter 132 is connected to a first input terminal of a composite video signal generator 180. An output terminal of the chrominance signal reproducer 170 is connected to an input terminal of an A-D converter 131. An output terminal of the A-D converter 131 is connected to an input terminal of a chrominance / motion signal separator 111. A first output terminal of the chrominance / motion signal separator ill is connected to an input terminal of a DA converter 133. And, a second output terminal of the chrominance / motion signal separator 111 is connected to a control terminal of the frequency unfolder 150. An output terminal of the D-A converter 133 is connected to a second input terminal of the composite video signal generator 180.
FIGS.4A to 4G are output characteristic diagrams for the respective parts of the circuit shown in FIG.3. FIG.4A is an output characteristic diagram of the luminance signal reproducer 120, when a video tape cassette recorded by a standard VHS VCR is played back, FIG.4B shows an output characteristic diagram of the luminance signal reproducer part 120, when a video tape cassette recorded by a VCR of 1 the present invention is played back. And, FIG.4C is an output characteristic diagram of a low-pass filter 140, when a video tape cassette recorded by a standard VHS VCR is played back, and FIG.4D is an output characteristic diagram of the low-pass filter 140, when a video tape cassette recorded by a VCR of the present invention is played back. FIG.4E is an output characteristic diagram of a baseband processor 141. FIG.4F is an output characteristic diagram of the frequency unfolder 150, when a video tape cassette recorded by a standard VHS VCR is played back, and FIG.4G is an output characteristic diagram of a frequency unfolder 150, when a video tape cassette recorded by a VCR of the present invention is played back.
The operation of the circuit shown in FIG.3 will be described in detail in connection with the output characteristic diagram shown in FIGS.4A to 4G.
The magnetic reproducing head 100 reads out the information recorded on a video tape cassette and supplies it to the chrominance / luminance signal separator 110.
The chrominance /luminance si.gnal separator 110 separates a frequency modulated lumiimnce signal and an amplitude modulated chrominance signal from the information supplied from the magnetic reproducing bead 100.
The luminance signal reprozWcer 120 frequency- 11 demodulates the frequency modulated luminance separated from the chrominance / luminance signal a frequency signal, separator 110, thereby producing a luminance signal. The luminance signal generated in the luminance signal reproducer 120 has characteristic as shown in FIG.4A, when a reproduced video tape cassette is one wherein a video signal is recorded by a standard VHS VCR. Conversely, the luminance signal has a frequency characteristic as shown in FIG.4B, when a reproduced video tape cassette is one wherein a video signal is recorded by the VCR of the present invention.
The A-D converter 130 converts the demodulated luminance signal to a multibit digital video signal.
The low-pass filter 140 filters the digital luminance signal to detect a luminance signal distributed in a limited bandwidth ( within 2.5 MHz). When the luminance signal having a frequency characteristic such as that of FIG.4A is fed to the low-pass filter 140, the filtered luminance signal has a frequency characteristic such as that of FIG.4C, and when the luminance signal having a frequency characteristic such as that of FIG.4B is fed to the low-pass filter 140, the filtered luminance signal has a frequency characteristic such as that of FIG.4D.
After unfolding the folded high frequency luminance component of the filtered limited bandwidth luminance signal 12 1 received from the low-pass filter 140 into the original frequency band, the frequency unfolder 150 suitably combines the low frequency luminance signal and the high frequency luminance signal according to the magnitude of the motion signal supplied from the chrominance /motion signal separator 111, thereby producing a full bandwidth luminance signal. When the luminance signal having the frequency characteristic such as that of FIG.4C is fed to the frequency unfolder 150, the luminance signal supplied from the frequency unfolder 150 has a frequency characteristic such as that of FIG.4F, and when the luminance signal having a frequency characteristic such as that of FIG.4D is fed to the frequency unfolder 150, the luminance signal has a frequency characteristic such as that FIG. 4G.
The baseband processor 141 filters the digi.1lal luminance signal to detect the luminance signal distributed in a frequency band within 3 MHz which is a limited bandwidth of a video tape cassette, and removes the folded high frequency luminance signal of the detected luminance signal to produce the luminance signal having the frequency characteristic such as in FIG.4E.
The adder 160 sums the luminance signal generated in the frequency unfolder 150 and the luminance signal processed in the baseband processor 141, thereby producing the luminance signal having the frequency characteristic of FIG.4E when the video tape cassette recorded by a standard 13 VHS VCR is played back, and producing the luminance signal having the frequency characteristic of FIG.4G when the video tape cassette recorded by a VCR of the present invention is played back.
The D-A converter 132 converts the output of the adder 160 to an analog signal.
The chrominance signal reproducer 170 amplitudedemodulates the amplitude modulated chrominance signal to produce a chrominance signal. The chrominance signal includes a motion signal, when the video tape cassette recorded by the VCR of the present invention is played back.
The AD converter 131 converts the demodulated chrominance signal into a digital chrominance signal.
The chrominance / motion signal separator 111 separates a motion signal and a chrominance signal from the digital chrominance signal, and then supplies the motion signal to the frequency unfolder 150 and supplies the chrominance signal to the D-A converter 133.
The DA converter 133 converts the digital chrominance signal, which is an output of the chrominance motion signal separator 111, into an analog signal.
The composite video signal generator 180 is operated by the conventional method to combine the luminance signal 14 supplied from the D-A converter 132 and the chrominance signal supplied from the D-A converter 133, thereby forming a standard composite video signal.
As described above, according to the present invention, a second passage, i.e. a baseband processor, for processing the luminance signal distributed in the limited bandwidth of a record medium is added to a frequency folding passage or a frequency unfolding passage, i.e., a first passage, for processing a luminance signal distributed in the limited band, so that the luminance signal of the limited frequency band is recorded and reproduced together with the folded luminance signal on a record medium. Thus, there is an advantage in that the resolution of the VCR according to the present invention is identical with that of the standard VHS VCR, when being compatible with the standard VHS VCR.
Claims (10)
- CLAIMS i 1. A video signal folding circuit, in a video recording apparatusfor recording a full bandwidth video signal including a chrominance signal and luminance signal on a record medium having a limited bandwidth, comprising:an AD converter for converting a full bandwidth video signal to a multibit digital video signal; a luminance signal separator for separating a full bandwidth luminance signal from said digital video signal; a frequency folder for folding a fligh frequency luminance signal of said full bandwidth luminance signal into a limited low frequency luminance signal, thereby producing a limited bandwidth folded luminance signal; an adder for adding said limited bandwidth folded luminance signal and said full bandwidth luminance signal; a D-A converter for converting the added digital luminance signal into an analog signal; a luminance signal recorder for modulating said added luminance signal to be recorded on the record medium; and a recording element for recording an output of said luminance signal recorder on the record medium.
- 2. A video signal folding circuit as claimed in claim 16 1, further comprising a low-pass filter, connected between said luminance signal separator and said adder, for detecting a luminance signal distributed in a limited bandwidth of a record medium among a full band luminance signal and supplying the detected signal to said adder.
- 3. A video signal folding circuit as claimed in claim 1, further comprising:a chrominance signal separator for separating a chrominance signal from a digital videc signal; a chrominance signal recorder for frequency converting said chrominance signal to be recorded on a record medium; and a chrominance/luminance signal mixer, connected between said chrominance signal recorder, said luminance signal recorder, and said recording element, for mixing said frequency converted chrominance signal and said modulated luminance signal and supplying the mixed signal to said recording element.
- 4. A video signal folding circuit as claimed in claim 3, further comprising; a motion signal separator for separating a motion signal from said digital video signal; and a chrominance/motion signal mixer, connected between 17 1 said motion signal separator, said chrominance signal separator, and said chrominance signal recorder, for mixing said motion signal and said chrominance signal and supplying the mixed signal to said chrominance signal recorder.
- 5. A video signal folding circuit as claimed in claim 4, wherein said recording element comprises a magnetic head.
- 6. A video signal unfolding circuit, in a video reproducing apparatus for reproducing a full bandwidth video signal consisting of a luminance signal and a chrominance signa, recorded on a record medium of a limited bandwidth, comprising:a read out element for reading out information recorded on the record medium; a luminance signal reproducer for demodulating the information read out by said read out element to reproduce a luminance signal; an A-D converter for converting said reproduced luminance signal into a digital luminance signal; a frequency unfolder for unfolding a high frequency luminance signal folded into a limited low frequency luminance signal of said digital luminance signal, into an original occupied bandwidth; and an adder for adding outputs of said frequency unfolder 18 1k and said A-D converter.
- 7. A video signal unfolding circuit as claimed in claim 6, further comprising a baseband processor, connected between said A-D converter and said adder, for detecting a luminance signal distributed in the limited bandwidth of the record medium among the output of said A-D converter, removing the high frequency luminance signal folded into the limited low frequency luminance signal among the detected luminance signal, and then supplying the luminance signal, in which the high frequency luminance signal is removed, to said adder.
- 8. A video folding and unfolding circuit substantially as herein described with reference to Figures 1 and 3 of the accompanying drawings.
- 9. Video signal recording apparatus for recording a video signal on a recording medium of limited bandwidth in which means are provided for deriving a first signal from the inputted video signal by frequency folding about a frequency within the limited bandwidth, and for deriving a second signal from the inputted video signal which includes video signal frequency information across the whole of the limited bandwidth, the recorded video signal comprising a combination of said first and second signals and including video signal information across the full video signal bandwidth.19 1
- 10. Video signal reproducing apparatus for reproducing a video signal from a recording medium of limited bandwidth in which means are provided for deriving a first signal from the inputted video signal by frequency unfolding about a frequency within the limited bandwidth and f or deriving a second signal from the inputted video signal which includes video signal frequency information across the whole of the limited bandwidth, the reproduced video signal comprising a combination of said f irst and second signals and including video signal information from the whole of the recorded video signal bandwidth.2 11
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900017580A KR920010167B1 (en) | 1990-10-31 | 1990-10-31 | Video signal overlaping and spreading circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9112036D0 GB9112036D0 (en) | 1991-07-24 |
| GB2249451A true GB2249451A (en) | 1992-05-06 |
Family
ID=19305468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9112036A Withdrawn GB2249451A (en) | 1990-10-31 | 1991-06-05 | A circuit for folding the high frequency component of a luminance signal |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH04227193A (en) |
| KR (1) | KR920010167B1 (en) |
| DE (1) | DE4118496A1 (en) |
| GB (1) | GB2249451A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993016559A1 (en) * | 1992-02-07 | 1993-08-19 | Samsung Electronics Co., Ltd. | Linear-phase filtering for playback of recorded folded-spectrum video |
| US5555096A (en) * | 1992-03-20 | 1996-09-10 | Samsung Electronics Co., Ltd. | Frequency folding and unfolding circuits of a video signal recording/reproducing apparatus |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5418619A (en) * | 1991-07-12 | 1995-05-23 | Samsung Electronics Co., Ltd. | Apparatus and method for selectively adapting a playback characteristic to meet video performance requirements |
| KR100315645B1 (en) * | 1999-05-18 | 2001-12-12 | 이현숙 | Aaaaa |
| KR20040047489A (en) * | 2002-11-28 | 2004-06-05 | 김선재 | Improvement of Sea-weed Off-flavor and Preparation of Soup using Sea Mustard Sporophyll |
| KR102327588B1 (en) * | 2020-01-17 | 2021-11-17 | 디엘바이오(주) | Method for manufacturing natural fermented seasoning |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59171387A (en) * | 1983-03-18 | 1984-09-27 | Hitachi Ltd | Method for constituting television signal |
| JPS61157193A (en) * | 1984-12-28 | 1986-07-16 | Victor Co Of Japan Ltd | Video signal reproducing device |
| US4831463A (en) * | 1987-01-30 | 1989-05-16 | Faroudja Y C | Video processing in which high frequency luminance components are folded into a mid-band spectrum |
| KR930010928B1 (en) * | 1990-08-17 | 1993-11-17 | 삼성전자 주식회사 | Video signal recording system enabling limited bandwidth recording and playback |
-
1990
- 1990-10-31 KR KR1019900017580A patent/KR920010167B1/en not_active IP Right Cessation
-
1991
- 1991-05-31 JP JP3129460A patent/JPH04227193A/en active Pending
- 1991-06-05 GB GB9112036A patent/GB2249451A/en not_active Withdrawn
- 1991-06-05 DE DE4118496A patent/DE4118496A1/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993016559A1 (en) * | 1992-02-07 | 1993-08-19 | Samsung Electronics Co., Ltd. | Linear-phase filtering for playback of recorded folded-spectrum video |
| US5555096A (en) * | 1992-03-20 | 1996-09-10 | Samsung Electronics Co., Ltd. | Frequency folding and unfolding circuits of a video signal recording/reproducing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04227193A (en) | 1992-08-17 |
| GB9112036D0 (en) | 1991-07-24 |
| KR920010167B1 (en) | 1992-11-19 |
| DE4118496A1 (en) | 1992-05-07 |
| KR920008715A (en) | 1992-05-28 |
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Legal Events
| Date | Code | Title | Description |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |