CA1216657A - Component companding in a multiplexed component system - Google Patents
Component companding in a multiplexed component systemInfo
- Publication number
- CA1216657A CA1216657A CA000458772A CA458772A CA1216657A CA 1216657 A CA1216657 A CA 1216657A CA 000458772 A CA000458772 A CA 000458772A CA 458772 A CA458772 A CA 458772A CA 1216657 A CA1216657 A CA 1216657A
- Authority
- CA
- Canada
- Prior art keywords
- component
- luminance
- signal
- time
- compression
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
-
- 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
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/08—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using sequential signals only
Abstract
ABSTRACT
COMPONENT COMPANDING IN A MULTIPLEXED
COMPONENT SYSTEM
A transmitter applies luminance (Y) and chroma (R-Y,B-Y) components of a color television signal to a transmission path, such as a VTR or satellite, in dynamic range compressed form. To obtain optimum improvement in S/N ratio, different compression laws for the luminance and chroma components are used. The signals can additonally be time compressed and sent in TDM form. A
complementary receiver is described.
COMPONENT COMPANDING IN A MULTIPLEXED
COMPONENT SYSTEM
A transmitter applies luminance (Y) and chroma (R-Y,B-Y) components of a color television signal to a transmission path, such as a VTR or satellite, in dynamic range compressed form. To obtain optimum improvement in S/N ratio, different compression laws for the luminance and chroma components are used. The signals can additonally be time compressed and sent in TDM form. A
complementary receiver is described.
Description
~L2~iS'7 -1- RCA 79,640 COMPONENT SYSTEM
Background of the Invention The present invention relates to companding (compressing and expanding the dynamic range of a signal), and more particularly to companding of video signals.
Recently there is interest in transmitting color video signals in time multiplexed analog component form (MAC) rather than the more conventional composite form.
This transmission typically takes place by way of FM in a transmission channel. The channel may be a satellite transmission channel including a satellite and a transmitter or it may be a channel including a video tape recorder (VTR) recorded information being transmitted on video tapes. Such channels however contain noise, which degrades the quality of the reproduced picture. One way of improving the quality of the picture derived from such a noisy channel is by companding. In companding the dynamic range of the video signal at the transmitter or recorder is compressed, thereby raising its average-to-peak ratio, and hence its relative immunity to noise, and at the receiver or playback apparatus the dynamic range of the signal is expanded complementary to the compression function to restore its original amplitude distribution so as to obtain a correct signal for display. However since the luminaace and chroma components have different amplitude distri-butions, a single companding law for either a composite signal or a MAC signal will not provide optimum noise reduction for bothcomponents.
It is therefore desirable to provide optimum companding for both luminance and chroma components of video signal.
Summary of the Invention Method and apparatus for transmitting luminance and chroma component signals of a color video signal, said method comprising dynamic range compressing said component signals using different compression laws for said luminance component signal and for said chroma component signals.
~Z~6t~S~
Background of the Invention The present invention relates to companding (compressing and expanding the dynamic range of a signal), and more particularly to companding of video signals.
Recently there is interest in transmitting color video signals in time multiplexed analog component form (MAC) rather than the more conventional composite form.
This transmission typically takes place by way of FM in a transmission channel. The channel may be a satellite transmission channel including a satellite and a transmitter or it may be a channel including a video tape recorder (VTR) recorded information being transmitted on video tapes. Such channels however contain noise, which degrades the quality of the reproduced picture. One way of improving the quality of the picture derived from such a noisy channel is by companding. In companding the dynamic range of the video signal at the transmitter or recorder is compressed, thereby raising its average-to-peak ratio, and hence its relative immunity to noise, and at the receiver or playback apparatus the dynamic range of the signal is expanded complementary to the compression function to restore its original amplitude distribution so as to obtain a correct signal for display. However since the luminaace and chroma components have different amplitude distri-butions, a single companding law for either a composite signal or a MAC signal will not provide optimum noise reduction for bothcomponents.
It is therefore desirable to provide optimum companding for both luminance and chroma components of video signal.
Summary of the Invention Method and apparatus for transmitting luminance and chroma component signals of a color video signal, said method comprising dynamic range compressing said component signals using different compression laws for said luminance component signal and for said chroma component signals.
~Z~6t~S~
-2- RCA 79,640 Description of the Drawinqs FIGURE 1 is a block diagram of an illustrative transmitter in accordance with the present invention; and FIGURE 2 is ablock diagram of an illustrative receiver in accordance with the present invention.
Detailed Description FIGURE 1 shows a block diagram of a transmitter.
Input terminals 10, 12, and 14 respectively receive Y, R-Y, and B-Y 8-bit digital video signals from a source, e.g. a camera followed by an 8-~it digitizer. For a satellite path, the Y signal might typically have a sample rate of 3fsc (10.74 MHz for NTSC), while the R-Y and B-Y
would be digitized at fsc (3.58 MHz). For a VTR, the digitized frequencies typically might be 13.5 MHz for Y
and 6.75 M~z for R-Y and B-Y.
The Y, R-Y, and B-Y signals are respectively applied to time compressors 16, 18 and 20. As known in the art, each of compressors 16, 18, and 20 can comprise input and output switching circuits and a pair of RAMs (random access memories), a first of which has information written in during a line, while the secohd of which reads out information. During the next line, the first RAM is in the READ mode, while the second RAM is in WRITE mode, etc. The READ and WRITE clock signals are supplied by clock signal sources (not shown). The WRITE clock frequencies are equal to the digitizing frequency of the respective input signal, while the READ clock frequencies are higher than the respective WRITE frequencies in order to provide time compression. For satellites, the READ
clock typically might be 4fsc (14.32 M~z) for all time compressors. This provides a time compression of 4:3 (14.32: 10.74) for Y and 4:1 (14.32:3.58) for the R-Y and B-Y signals. For a VTR, the READ frequency typically might be 27 MHz, thereby providing a compression of 2:1 (27:13.5) for Y and 4:1 (27:6.75) for the R-Y and B-Y
signals. The READ signals are synchronized during a line so that the output signals from compressors 16, 18, and 20 do not overlap in time.
Detailed Description FIGURE 1 shows a block diagram of a transmitter.
Input terminals 10, 12, and 14 respectively receive Y, R-Y, and B-Y 8-bit digital video signals from a source, e.g. a camera followed by an 8-~it digitizer. For a satellite path, the Y signal might typically have a sample rate of 3fsc (10.74 MHz for NTSC), while the R-Y and B-Y
would be digitized at fsc (3.58 MHz). For a VTR, the digitized frequencies typically might be 13.5 MHz for Y
and 6.75 M~z for R-Y and B-Y.
The Y, R-Y, and B-Y signals are respectively applied to time compressors 16, 18 and 20. As known in the art, each of compressors 16, 18, and 20 can comprise input and output switching circuits and a pair of RAMs (random access memories), a first of which has information written in during a line, while the secohd of which reads out information. During the next line, the first RAM is in the READ mode, while the second RAM is in WRITE mode, etc. The READ and WRITE clock signals are supplied by clock signal sources (not shown). The WRITE clock frequencies are equal to the digitizing frequency of the respective input signal, while the READ clock frequencies are higher than the respective WRITE frequencies in order to provide time compression. For satellites, the READ
clock typically might be 4fsc (14.32 M~z) for all time compressors. This provides a time compression of 4:3 (14.32: 10.74) for Y and 4:1 (14.32:3.58) for the R-Y and B-Y signals. For a VTR, the READ frequency typically might be 27 MHz, thereby providing a compression of 2:1 (27:13.5) for Y and 4:1 (27:6.75) for the R-Y and B-Y
signals. The READ signals are synchronized during a line so that the output signals from compressors 16, 18, and 20 do not overlap in time.
-3- RC~ 79, 640 The Y, P~-Y, ~ ~-Y cignal6 are ~pplie~ to ~
(~ultipleacer) 22, whic~ iB controll~d by controller 24. ~6 l~nown in t~e ~ controll~r 24 c:~n co~prise a counter thAt cour~t6 27 M~z or 13.5 M}~z clock ~ul~e6 ~ 6 re~et S by the horizont~ c. A d~coder i6 couple~ to ~he counter to id~ntify ~el~cted portion6 of the l~oriæontal line tilDe and to control MUX 22 in ~ccordance with the ti~e ~o a~ to collple each RAM to the following ~tage6 during the inten~al ~hen t}~e ~ outputting 6ign~16.
10 l~ne~e ~isJnal6 can ~180 control the timing of the READ
~ignals applied t4 compre~sor6 16, 18, and 20.
The 8~bit time multiple~d 6ignal from ~MX 22 is applie~ to dynamic r~ co~pre6~0r 26, which can compri~e h lK by 8 RAM or ROM (read only memory~ who~e ~ddre~ inputs are u6ed as the 6ignal input~. The non-linear function i~
~tored in the RAM a6 de~cribed in u.s Patent 4396938 corresponding to Canadian Patent Ap~lication 407263-4.
In particular the ~-law a~ used in telephony has been found useful in i~pro~ing video ~ignal-to-noise ratio. A possible ~-law for the R-Y and B-Y signals i6 given by ~(~) = 50 ~ 50 10R (1~UX) 25 log (l -U) wherein I I~ UNITS-50l 30X =-- -- -- , S ~ e b~C~lve F(x) i~ the output 6ignal in IRE units, and the po~itive sign, i~ u~ed for input values equal to at least 50 units, 35 and the negative sig~ i8 u~ed for input values less than ~~
50 IRE units. The ab~olute value sign is needed ~ince the ~-chro~a signals are nonmally on a 50 IRE units pede~tal.
For the Y ~ignal~, the law can be ~2~66S7
(~ultipleacer) 22, whic~ iB controll~d by controller 24. ~6 l~nown in t~e ~ controll~r 24 c:~n co~prise a counter thAt cour~t6 27 M~z or 13.5 M}~z clock ~ul~e6 ~ 6 re~et S by the horizont~ c. A d~coder i6 couple~ to ~he counter to id~ntify ~el~cted portion6 of the l~oriæontal line tilDe and to control MUX 22 in ~ccordance with the ti~e ~o a~ to collple each RAM to the following ~tage6 during the inten~al ~hen t}~e ~ outputting 6ign~16.
10 l~ne~e ~isJnal6 can ~180 control the timing of the READ
~ignals applied t4 compre~sor6 16, 18, and 20.
The 8~bit time multiple~d 6ignal from ~MX 22 is applie~ to dynamic r~ co~pre6~0r 26, which can compri~e h lK by 8 RAM or ROM (read only memory~ who~e ~ddre~ inputs are u6ed as the 6ignal input~. The non-linear function i~
~tored in the RAM a6 de~cribed in u.s Patent 4396938 corresponding to Canadian Patent Ap~lication 407263-4.
In particular the ~-law a~ used in telephony has been found useful in i~pro~ing video ~ignal-to-noise ratio. A possible ~-law for the R-Y and B-Y signals i6 given by ~(~) = 50 ~ 50 10R (1~UX) 25 log (l -U) wherein I I~ UNITS-50l 30X =-- -- -- , S ~ e b~C~lve F(x) i~ the output 6ignal in IRE units, and the po~itive sign, i~ u~ed for input values equal to at least 50 units, 35 and the negative sig~ i8 u~ed for input values less than ~~
50 IRE units. The ab~olute value sign is needed ~ince the ~-chro~a signals are nonmally on a 50 IRE units pede~tal.
For the Y ~ignal~, the law can be ~2~66S7
-4- RCA 79,640 F(x) = 100 _laL~ +
wherein ~ e~uals about 3 and 5x = IRE UNITS
Controller 24 supplies a 2-bit page control signal to compressor 26 to provide selection of one of four pages, each page having a different dynamic range compression law.
The four pages allow different laws for the R-Y and B-Y
signals if that is found desirable due to different amplitude distributions between these signals. This would take up three pages for the three video signals. The fourth page can be used for compression of the audio signal, assuming it has been digitized, or compression of a digital coded signal. The fourth page can also have a linear transfer function if that is desired for a particular signal such as audio that has been compressed in analog form. This would require MUX 22 having an extra input. If the R-Y and B-Y signals are to have exactly the same compression law and no compression of audio or the code signal is to take place, then only a l-bit page select signal is necessaxy to select between the two required pages to compress the two types of signals (Y and color difference).
The 8-bit output signal from compressor 26 is applied to DAC (ditigal-to-analog converter) 28. The resulting analog signal is applied to insertion circuit 30 which adds H and V sync and a clock burst signal, e.g. a signal that is frequency related by an integer to the 14.32 M~z or 27 M~z data rate frequency, such as respectively a 3.5 Hz or 4.5 M~z signal. The output of circuit 30 is applied to transmission channel 32, such as a satellite or VTR having an FM modulator (not shown).
FIGURE 2 shows a block diagram of a receiver for use with the transmitter of FIGURE 1. Input terminal 40 receives an analog video signal from channel 32 that has been d modulated by an FM detector (not shown~. This ~Z~665~7
wherein ~ e~uals about 3 and 5x = IRE UNITS
Controller 24 supplies a 2-bit page control signal to compressor 26 to provide selection of one of four pages, each page having a different dynamic range compression law.
The four pages allow different laws for the R-Y and B-Y
signals if that is found desirable due to different amplitude distributions between these signals. This would take up three pages for the three video signals. The fourth page can be used for compression of the audio signal, assuming it has been digitized, or compression of a digital coded signal. The fourth page can also have a linear transfer function if that is desired for a particular signal such as audio that has been compressed in analog form. This would require MUX 22 having an extra input. If the R-Y and B-Y signals are to have exactly the same compression law and no compression of audio or the code signal is to take place, then only a l-bit page select signal is necessaxy to select between the two required pages to compress the two types of signals (Y and color difference).
The 8-bit output signal from compressor 26 is applied to DAC (ditigal-to-analog converter) 28. The resulting analog signal is applied to insertion circuit 30 which adds H and V sync and a clock burst signal, e.g. a signal that is frequency related by an integer to the 14.32 M~z or 27 M~z data rate frequency, such as respectively a 3.5 Hz or 4.5 M~z signal. The output of circuit 30 is applied to transmission channel 32, such as a satellite or VTR having an FM modulator (not shown).
FIGURE 2 shows a block diagram of a receiver for use with the transmitter of FIGURE 1. Input terminal 40 receives an analog video signal from channel 32 that has been d modulated by an FM detector (not shown~. This ~Z~665~7
-5- RCA 79,640 baseband signal is applied to ADC (analog-to-digital converter) 42 and to separator circuit 44. The output signal of ADC 42 comprise~ an 8-bit time multiplexed digital video signal occurring at e.g. 14.32 MHz for a satellite path or 27 MHz for a VTR, which signal is applied to the address inputs of a RAM ~mprising dynamic range expander 46.
The H and V sync and clock burst si~nals from separator 44 are applied to controller 48, which has a similar construction as controller 24. The clock signal can be obtained from a VCO (voltage controlled oscillator) freguency multiplier (not shown) within controller 48 by frequency comparing the clock burst with the VC0 output signal that has been frequency divided. A 2-bit page - 15 select signal is applied to expander 46 to select the expanding function which is complementary to the compressing function used with the respective signal, e.g.
inverse ~-law with the appropriate value of ~.
Ihe dynamic range exparx~ed digital signals from expander 46 are then applied to DEMUX (demultiplexer) 50, which is controlled by controller 48. The separated Y, R-Y, and B-Y signals are respectively applied to time expanders 52, 54, and 56 which expanders can be of identical construction as time compressors 16, 18, 20, e.g. each comprising a pair of switched RA~s, one of which writes while the other reads during one line, the operations being interchanged during the next line.
The WRITE clock frequencies for all expanders 52, 54, and 56 can be derived from controller 48 and are the same and equal the video data rate, e.g. 14.32 MHz for satellite or 27 MHz for a VTR. The READ clock freguencies are selected to be lower so that time expansion takes place such that all signals occupy an entire active line.
For the Y signal READ clock frequency, 10.74 MHz for a satellite path and 13.5 M~Z for a VTR can be used. For the R-Y and B-Y signals the READ clock can be 3.58 MHz for a satellite path or 6.75 MHz for a VTR.
~Z166S7
The H and V sync and clock burst si~nals from separator 44 are applied to controller 48, which has a similar construction as controller 24. The clock signal can be obtained from a VCO (voltage controlled oscillator) freguency multiplier (not shown) within controller 48 by frequency comparing the clock burst with the VC0 output signal that has been frequency divided. A 2-bit page - 15 select signal is applied to expander 46 to select the expanding function which is complementary to the compressing function used with the respective signal, e.g.
inverse ~-law with the appropriate value of ~.
Ihe dynamic range exparx~ed digital signals from expander 46 are then applied to DEMUX (demultiplexer) 50, which is controlled by controller 48. The separated Y, R-Y, and B-Y signals are respectively applied to time expanders 52, 54, and 56 which expanders can be of identical construction as time compressors 16, 18, 20, e.g. each comprising a pair of switched RA~s, one of which writes while the other reads during one line, the operations being interchanged during the next line.
The WRITE clock frequencies for all expanders 52, 54, and 56 can be derived from controller 48 and are the same and equal the video data rate, e.g. 14.32 MHz for satellite or 27 MHz for a VTR. The READ clock freguencies are selected to be lower so that time expansion takes place such that all signals occupy an entire active line.
For the Y signal READ clock frequency, 10.74 MHz for a satellite path and 13.5 M~Z for a VTR can be used. For the R-Y and B-Y signals the READ clock can be 3.58 MHz for a satellite path or 6.75 MHz for a VTR.
~Z166S7
-6- RCA 79,640 1 The 8-bit output signals from expanders 52, 54, and 56 are respectively applied to DACs 58, 60, and 62, where analog outpu~ signal6 are available for further processing, e.g. matrixing, or for display.
Claims (8)
- CLAIMS: 1. Apparatus for transmitting luminance and chroma component signals of a color video signal and for reducing the effect of the noise on the transmitted signals, said apparatus comprising first means for amplitude compressing said component signals using different compression laws for said luminance component signal and for said chroma component signal and wherein;
said compression law for said luminance component signal is a non-symmetrical function of the amplitude of said luminance component signal and wherein said compression law for said chrominance component signal is a symmetrical function of the amplitude of said chrominance component signal. - 2. Apparatus as claim in claim 1 further comprising second means for time compressing said luminance and chroma components; switch means for selectively coupling the time compressed components to the input of said first means and controller means coupled to said switch means and to said first means for controlling the compression law of said first means in accordance with the component selected by said switch means.
- 3. Apparatus as claimed in claim 1, wherein said chroma component signal comprises first and second color difference component signals and wherein said first means uses different compression laws for each of said color difference component signals and wherein each compression law is a symmetrical function of the amplitude of respective ones of said color difference signal.
- 4. Apparatus for receiving amplitude compressed luminance and chroma components of a color video signal wherein said components are compressed prior to transmission by different compression laws for reducing the effect of noise on the transmitted signals, said apparatus comprising first means for expanding said components using different expansion laws that are the inverse of said respective compression laws;
said expansion law for said luminance component being a non-symmetrical function of the amplitude of said luminance component and wherein said expansion law for said chrominance component being is a symmetrical function of the amplitude of said chrominance component. - 5. Apparatus as claimed in claim 4, wherein said component signals are also time compressed and transmitted in time division multiplex form, said apparatus further comprising switch means coupled to the output of said first means for demultiplexing said component signals subsequent to amplitude expansion by said first means, a separate second means coupled to said switch means for providing time expansion of respective ones of said demultiplexed component signals;
and a controller means coupled to said switch means for controlling the expansion law of said first means with the component selected for demultiplexing by said switch means. - 6. Apparatus as claimed in claim 4, wherein said chroma component comprises first and second color difference components, each having different amplitude compression laws, said first means having different expansion laws for each of said chroma components and wherein each color difference component expansion law is a symmetrical function of the amplitude of respective ones of said color difference components.
- 7. Apparatus for transmitting luminance and chroma components of a color video signal and for reducing the effect of noise on the transmitted signal, said apparatus comprising, time compression means for each of said components;
multiplexing means coupled to said compression means;
amplitude compression means coupled to said multiplexing means and having different compression laws for said luminance and chrominance components;
digital-to-analog converters coupled to said amplitude compression means; and a transmission path coupled to said converter means; and wherein said compression law for said luminance component is a non-symmetrical function of the amplitude of said luminance component; and wherein said compression law for said chrominance component is a symmetrical function of the amplitude of said chrominance component. - 8. A method for transmitting color television signals comprising at least a luminance and a chrominance component from a source of signals, comprising the steps of controllably time-compressing each line of luminance-representative video to produce time-compressed luminance signals;
controllably time-compressing each line of chrominance-representative video to produce time-compressed chrominance signals;
controlling said controllably time-compressing so that the sum of the duration of the time compressed luminance and chrominance-representative signals equals a predetermined duration and so that each of said time-compressed luminance and chrominance signal is generated time-sequentially;
adding together said time-compressed luminance and chrominance signals to form a sequential time-multiplexed signal including luminance and chrominance signal positions in a time sequence;
amplitude-compressing said sequential time-multiplexed signal according to a controllable law;
controlling said law in accordance with said time sequence to form a plural-law-compressed signal;
and transmitting said plural-law-compressed signal over a single transmission channel and wherein:
said compression law for said luminance component is a non-symmetrical function of the amplitude of said luminance component and wherein said compression law for said chrominance component is a symmetrical function of the ampltide of said chrominance component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US518,087 | 1983-07-28 | ||
| US06/518,087 US4575749A (en) | 1983-07-28 | 1983-07-28 | Component companding in a multiplexed component system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1216657A true CA1216657A (en) | 1987-01-13 |
Family
ID=24062499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000458772A Expired CA1216657A (en) | 1983-07-28 | 1984-07-12 | Component companding in a multiplexed component system |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4575749A (en) |
| JP (1) | JP2553833B2 (en) |
| KR (1) | KR930002125B1 (en) |
| CA (1) | CA1216657A (en) |
| DE (1) | DE3427668A1 (en) |
| FR (1) | FR2550040B1 (en) |
| GB (1) | GB2144300B (en) |
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| JP2535831B2 (en) * | 1986-05-30 | 1996-09-18 | ソニー株式会社 | Adjustment circuit for time division multiplexed video signal |
| JPH0634523B2 (en) * | 1987-04-16 | 1994-05-02 | 日本ビクター株式会社 | Color image high efficiency coding method |
| GB8721565D0 (en) * | 1987-09-14 | 1987-10-21 | Rca Corp | Video signal processing system |
| US4994899A (en) * | 1988-03-23 | 1991-02-19 | Scientific Atlanta, Inc. | Frequency generation for extended bandwidth MAC color television encoding and decoding |
| US5005082A (en) * | 1989-10-03 | 1991-04-02 | General Electric Company | Video signal compander adaptively responsive to predictions of the video signal processed |
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| US5258928A (en) * | 1990-05-03 | 1993-11-02 | Rca Thomson Licensing Corporation | Parts efficient memory based functional circuit having selectable transfer characteristics |
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| US5830596A (en) * | 1993-05-03 | 1998-11-03 | Morgan Adhesives, Inc. | Method for producing battery tester label and resulting label and battery assembly |
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| JP3075265B2 (en) * | 1998-08-12 | 2000-08-14 | ソニー株式会社 | Digital still camera and image data processing device |
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-
1983
- 1983-07-28 US US06/518,087 patent/US4575749A/en not_active Expired - Lifetime
-
1984
- 1984-07-05 KR KR1019840003890A patent/KR930002125B1/en not_active IP Right Cessation
- 1984-07-12 CA CA000458772A patent/CA1216657A/en not_active Expired
- 1984-07-24 GB GB08418859A patent/GB2144300B/en not_active Expired
- 1984-07-26 DE DE19843427668 patent/DE3427668A1/en active Granted
- 1984-07-27 JP JP59158548A patent/JP2553833B2/en not_active Expired - Fee Related
- 1984-07-27 FR FR848412002A patent/FR2550040B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2144300B (en) | 1987-04-08 |
| KR930002125B1 (en) | 1993-03-26 |
| KR850000880A (en) | 1985-03-09 |
| US4575749A (en) | 1986-03-11 |
| JPS6052189A (en) | 1985-03-25 |
| JP2553833B2 (en) | 1996-11-13 |
| GB8418859D0 (en) | 1984-08-30 |
| GB2144300A (en) | 1985-02-27 |
| FR2550040B1 (en) | 1990-03-09 |
| DE3427668C2 (en) | 1992-11-19 |
| FR2550040A1 (en) | 1985-02-01 |
| DE3427668A1 (en) | 1985-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |