US4347619A
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Digital formatting system
Assignee: Discovision Associates
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Filing: 1980-12-19
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Granted: 1982-08-31
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Expires: 2000-12-19
Abstract
Abstract An improved method and apparatus for transforming digital information into a special format similar to that of a standard color video signal. The special format includes a multi-level baseband component corresponding to the luminance component of a standard video signal, and a phase and/or amplitude-modulated subcarrier corresponding to the chrominance component of a video signal. This format is highly efficient and takes better advantage of high signal-to-noise ratio channels, and the signal can be transmitted over standard video channels and conventional video circuitry can be used to process it.
Inventors
- 👤 Wayne R. Dakin
- 👤 Jordan Isailovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/8205; H04N9/8233; G11B20/02; G11B20/06; G11B7/00; G11B7/004; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N7/00; H04N7/002; H04N9/8211; H04N9/8222
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
111 words
A method of formatting digital information into a format similar to that of a color video signal, comprising steps of: converting the digital information into a first multi-level signal and a second multi-level signal, each signal having at least two signal states, and each level of said multi-level signals representing a corresponding arrangement of binary states of said digital information; providing a subcarrier having a prescribed frequency; modulating the subcarrier in accordance with the second multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 2
Independent Claim
111 words
A method of formatting digital information into a format similar to that of a color video signal, comprising steps of: converting the digital information into a first multi-level signal and a second multi-level signal, each signal having at least two signal states, and each level of said multi-level signals representing a corresponding arrangement of binary states of said digital information; providing a subcarrier having a prescribed frequency; modulating the subcarrier in accordance with the second multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 3
Dependent Claim
67 words
A method as defined in claim 1, wherein the step of arranging includes steps of: formatting the digital information into a succession of multi-bit words; separating each of the successive multi-bit words into a first group of bits and a second group of bits, at least the first group including a plurality of bits; and converting the successive first groups of bits into the first multi-level signal.
Claim 4
Dependent Claim
53 words
A method as defined in claim 2, wherein: the second group of bits in each of the successive multi-bit words produced in the step of separating includes a plurality of bits; and the step of arranging further includes a step of converting the successive second groups of bits into the second multi-level signal.
Claim 5
Dependent Claim
43 words
A method as defined in claim 3, wherein: the differences between the successive levels in the first multi-level signal are substantially equal to each other; and the differences between the successive levels in the second multi-level signal are substantially equal to each other.
Claim 6
Dependent Claim
33 words
A method as defined in claim 3, wherein both the step of converting the successive first groups and the step of converting the successive second groups are performed according to a Gray code.
Claim 7
Dependent Claim
25 words
A method as defined in claim 1, wherein the step of modulating modulates the amplitude of the subcarrier in accordance with the second multi-level signal.
Claim 8
Dependent Claim
26 words
A method as defined in claim 1, wherein the step of modulating modulates the phase angle of the subcarrier in accordance with the second multi-level signal.
Claim 9
Dependent Claim
48 words
A method as defined in claim 1, wherein the step of modulating modulates the amplitude of the subcarrier in accordance with a first portion of the second multi-level signal and modulates the phase angle of the subcarrier in accordance with a second portion of the second multi-level signal.
Claim 10
Dependent Claim
28 words
A method as defined in claim 1, wherein the first multi-level signal and the second multi-level signal formed in the step of arranging have substantially the same bandwidth.
Claim 11
Dependent Claim
141 words
Apparatus for formatting digital information into a format similar to that of a color video signal, suitable for transmission over a standard video channel, the apparatus comprising: signal source means for providing conventional video synchronizing signals; first and second digital-to-analog converter means for converting the digital information into first and second multi-level baseband signals, respectively, each of said first and second multi-level baseband signals having at least two signal states, and each level of said multi-level signals representing a corresponding arrangement of binary states of said digital information; means for modulating a subcarrier in accordance with the second multi-level signal; and means for summing together the first multi-level signal, the modulated subcarrier, and the video synchronizing signals, to produce a composite signal having a format similar to that of a color video signal, suitable for transmission over a standard video channel.
Claim 12
Dependent Claim
141 words
Apparatus for formatting digital information into a format similar to that of a color video signal, suitable for transmission over a standard video channel, the apparatus comprising: signal source means for providing conventional video synchronizing signals; first and second digital-to-analog converter means for converting the digital information into first and second multi-level baseband signals, respectively, each of said first and second multi-level baseband signals having at least two signal states, and each level of said multi-level signals representing a corresponding arrangement of binary states of said digital information; means for modulating a subcarrier in accordance with the second multi-level signal; and means for summing together the first multi-level signal, the modulated subcarrier, and the video synchronizing signals, to produce a composite signal having a format similar to that of a color video signal, suitable for transmission over a standard video channel.
Claim 13
Dependent Claim
17 words
Apparatus as defined in claim 10, wherein the means for modulating modulates the amplitude of the subcarrier.
Claim 14
Dependent Claim
46 words
Apparatus as defined in claim 11, wherein the means for modulating modulates the amplitude of the subcarrier in accordance with a first portion of the second multi-level signal and the phase angle of the subcarrier in accordance with a second portion of the second multi-level signal.
Claim 15
Dependent Claim
42 words
Apparatus as defined in claim 10, wherein: the differences between the successive levels in the first multi-level signal are substantially equal to each other; and the differences between the successive levels in the second multi-level signal are substantially equal to each other.
Claim 16
Dependent Claim
18 words
Apparatus as defined in claim 10, wherein the first and second multi-level signals have substantially the same bandwidth.
Claim 17
Dependent Claim
44 words
Apparatus as defined in claim 10, wherein: the bandwidths of the first multi-level signal and the modulated subcarrier overlap each other; and the frequency spectra of the first multi-level signal and the modulated subcarrier include periodically-spaced, discrete components that are interleaved with each other.
Claim 18
Dependent Claim
42 words
Apparatus as defined in claim 10, wherein: both the first multi-level signal and the second multi-level signal include more than two signal states; and both the first digital-to-analog converter and the second digital-to-analog converter perform conversions in accordance with a Gray code.
Claim 19
Dependent Claim
123 words
Apparatus for demodulating a composite signal carrying digital information and having a special format similar to that of a color video signal, the composite signal including a first multi-level signal, a subcarrier modulated in accordance with a second multi-level signal, and video synchronization signals, the apparatus comprising: means for extracting the first multi-level signal from the composite signal; means for converting the first multi-level signal into a corresponding first digital signal; means for extracting the modulated subcarrier from the composite signal; means for demodulating the extracted subcarrier to yield the second multi-level signal; and means for converting the second multi-level signal into a corresponding second digital signal; wherein the first and second digital signals represent the digital information carried by the composite signal.
Claim 20
Dependent Claim
123 words
Apparatus for demodulating a composite signal carrying digital information and having a special format similar to that of a color video signal, the composite signal including a first multi-level signal, a subcarrier modulated in accordance with a second multi-level signal, and video synchronization signals, the apparatus comprising: means for extracting the first multi-level signal from the composite signal; means for converting the first multi-level signal into a corresponding first digital signal; means for extracting the modulated subcarrier from the composite signal; means for demodulating the extracted subcarrier to yield the second multi-level signal; and means for converting the second multi-level signal into a corresponding second digital signal; wherein the first and second digital signals represent the digital information carried by the composite signal.
Claim 21
Dependent Claim
31 words
Apparatus as defined in claim 17, wherein: the means for extracting the first multi-level signal is a low-pass filter; and the means for extracting the modulated subcarrier is a high-pass filter.
Claim 22
Dependent Claim
28 words
Apparatus as defined in claim 17, wherein the means for converting the first multi-level signal and the means for converting the second multi-level signal are both analog-to-digital converters.
Claim 23
Dependent Claim
38 words
Apparatus as defined in claim 17, wherein: the amplitude of the modulated subcarrier signal is modulated in accordance with the second multi-level signal; and the means for demodulating includes means for detecting the amplitude of the modulated subcarrier.
Claim 24
Dependent Claim
80 words
Apparatus as defined in claim 20, wherein: the phase angle of the subcarrier signal in the composite signal is modulated in accordance with a third multi-level signal; the means for demodulating further includes means for demodulating the phase of the modulated subcarrier signal, to yield the third multi-level signal; and the apparatus further includes means for converting the third multi-level signal into a corresponding third digital signal, representative of a portion of the digital information carried by the composite signal.
Claim 25
Independent Claim
196 words
A method of formatting digital information into a format similar to that of a conventional color video signal, comprising steps of: formatting the digital information into a succession of multi-bit words; separating each of the successive multi-bit words into a first group of bits and a second group of bits, each group including a plurality of bits; converting the successive first groups of bits into a corresponding first multi-level, baseband signal; converting the successive second groups of bits into a corresponding second multi-level, baseband signal; wherein the differences between successive levels in the first multi-level signal are substantially equal to each other, and the differences between teh successive levels in the second multi-level signal are substantially equal to each other; providing a subcarrier having a prescribed frequency; modulating the amplitude of the subcarrier in accordance with a first portion of the second multi-level signal; modulating the phase angle of the subcarrier in accordance with a second portion of the secnd multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 26
Independent Claim
196 words
A method of formatting digital information into a format similar to that of a conventional color video signal, comprising steps of: formatting the digital information into a succession of multi-bit words; separating each of the successive multi-bit words into a first group of bits and a second group of bits, each group including a plurality of bits; converting the successive first groups of bits into a corresponding first multi-level, baseband signal; converting the successive second groups of bits into a corresponding second multi-level, baseband signal; wherein the differences between successive levels in the first multi-level signal are substantially equal to each other, and the differences between teh successive levels in the second multi-level signal are substantially equal to each other; providing a subcarrier having a prescribed frequency; modulating the amplitude of the subcarrier in accordance with a first portion of the second multi-level signal; modulating the phase angle of the subcarrier in accordance with a second portion of the secnd multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 27
Independent Claim
134 words
A method of formatting digital information into a format similar to that of a color video signal, comprising steps of: formatting the digital information into a succession of multi-bit words; separating each of the successive multi-bit words into a first group of bits and a second group of bits, at least the first group including a plurality of bits; converting the successive first groups of bits into a first multi-level signal; converting the successive second groups of bits into a second multi-level signal; providing a subcarrier having a prescribed frequency; modulating the subcarrier in accordance with the second multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 28
Independent Claim
134 words
A method of formatting digital information into a format similar to that of a color video signal, comprising steps of: formatting the digital information into a succession of multi-bit words; separating each of the successive multi-bit words into a first group of bits and a second group of bits, at least the first group including a plurality of bits; converting the successive first groups of bits into a first multi-level signal; converting the successive second groups of bits into a second multi-level signal; providing a subcarrier having a prescribed frequency; modulating the subcarrier in accordance with the second multi-level signal; providing video synchronization signals; and summing together the first multi-level signal, the modulated subcarrier, and the synchronization signals, to produce a composite signal having a format similar to that of a color video signal.
Claim 29
Dependent Claim
31 words
A method as defined in claim 23, wherein: the second group of bits in each of the successive multi-bit words produced in the step of separating includes a plurality of bits.
Claim 30
Dependent Claim
43 words
A method as defined in claim 24, wherein: the differences between the successive levels in the first multi-level signal are substantially equal to each other; and the differences between the successive levels in the second multi-level signal are substantially equal to each other.
Claim 31
Dependent Claim
33 words
A method as defined in claim 24, wherein both the step of converting the successive first groups and the step of converting the successive second groups are performed according to a Gray code.
Claim 32
Dependent Claim
164 words
Apparatus for formatting digital information into a format similar to that of a color video signal, suitable for transmission over a standard video channel, the apparatus comprising: first digital-to-analog converter means for converting a first portion of the digital information into a first multi-level baseband signal of a first bandwidth; second digital-to-analog converter means for converting a second portion of the digital information into a second multi-level baseband signal of a second bandwidth; means for modulating a subcarrier in accordance with the second multi-level signal; and means for summing together the first multi-level signal, the modulated subcarrier, and video synchronizing signals, to produce a composite signal having a format similar to that of a color video signal, suitable for transmission over a standard video channel; and wherein: the bandwidths of the first multi-level signal and the modulated subcarrier overlap each other; and the frequency spectra of the first multi-level signal and the modulated subcarrier include periodically-spaced, discrete components that are interleaved with each other.
Claim 33
Dependent Claim
164 words
Apparatus for formatting digital information into a format similar to that of a color video signal, suitable for transmission over a standard video channel, the apparatus comprising: first digital-to-analog converter means for converting a first portion of the digital information into a first multi-level baseband signal of a first bandwidth; second digital-to-analog converter means for converting a second portion of the digital information into a second multi-level baseband signal of a second bandwidth; means for modulating a subcarrier in accordance with the second multi-level signal; and means for summing together the first multi-level signal, the modulated subcarrier, and video synchronizing signals, to produce a composite signal having a format similar to that of a color video signal, suitable for transmission over a standard video channel; and wherein: the bandwidths of the first multi-level signal and the modulated subcarrier overlap each other; and the frequency spectra of the first multi-level signal and the modulated subcarrier include periodically-spaced, discrete components that are interleaved with each other.
References Cited (Backward Citations)
US2995620A
Cited
USRE30182E
Cited
US3889288A
Cited
US3973079A
Cited
US3968513A
Cited
US4068258A
Cited
US4303912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |