US5572247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processor for receiving data from a video signal
Assignee: WAVO Corp
•
Filing: 1994-04-08
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Granted: 1996-11-05
•
Expires: 2014-04-08
Abstract
Abstract Signal processors for permitting the transparent reception of a data signal in the video bandwidth of a cable television system is disclosed. The received signal has video and data components that are frequency interleaved in the video bandwidth in the active video intervals. The data signal is modulated with a carrier at a non-integral multiple of the horizontal scanning rate of the video signal. The receiver selects a forward channel transmitting the combined signal responsive to a control signal and extracts the data portion of the transmitted combined signal.
Inventors
- 👤 Gerald D. Montgomery
- 👤 Jay B. Norrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:49
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/10; H04N1/00; H04N1/00095; H04N1/00098; H04N7/0803; H04N7/081; H04N5/00; H04N5/44; H04N5/445
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
An apparatus for receiving data transmitted over a cable television network, the network including a transmission medium and having forward channels for transmission of video signals having a rasterized format, the format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, at least one of the forward channels transmitting a combined signal of a data signal frequency interleaved with the bandwidth of a video signal in active intervals, subchannels and a control channel, the apparatus comprising: a video receiver having a tuner for selecting between forward channels; a control channel receiver responsive to the control channel; a tunable subchannel transmitter; and a controller responsive to control signals transmitted over the control channel for altering the selection of the forward channel and the tuning of the subchannel transmitter.
Claim 2
Independent Claim
134 words
An apparatus for receiving data transmitted over a cable television network, the network including a transmission medium and having forward channels for transmission of video signals having a rasterized format, the format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, at least one of the forward channels transmitting a combined signal of a data signal frequency interleaved with the bandwidth of a video signal in active intervals, subchannels and a control channel, the apparatus comprising: a video receiver having a tuner for selecting between forward channels; a control channel receiver responsive to the control channel; a tunable subchannel transmitter; and a controller responsive to control signals transmitted over the control channel for altering the selection of the forward channel and the tuning of the subchannel transmitter.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1, the apparatus further including means for extracting the data signal from the received combined signal.
Claim 4
Dependent Claim
48 words
The apparatus of claim 1, wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a chrominance subcarrier, and wherein the data signal portion of the combined signal is frequency interleaved with the video signal in the bandwidth at a frequency greater than the chrominance subcarrier.
Claim 5
Dependent Claim
53 words
The apparatus of claim 1, wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a vestigial chrominance sideband, and wherein the data signal portion of the combined signal is frequency interleaved with the video signal in the bandwidth so that the data signal lies substantially within the vestigial chrominance sideband.
Claim 6
Dependent Claim
67 words
The apparatus of claim 1, wherein the bandwidth includes luminance and chrominance components, and wherein the data signal portion of the combined signal is modulated with a carrier at an odd quarter, non-integral multiple of the frequency of the raster rate of the video signal so that the spectral energy of the modulated carrier is frequency interleaved with the chrominance and luminance components of the video signal.
Claim 7
Independent Claim
139 words
A method of receiving data transmitted over a cable television network, the network including a transmission medium and having forward channels for transmission of video signals having a rasterized format, the format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, at least one of the forward channels transmitting a combined signal of a data signal frequency interleaved with the bandwidth of a video signal in active intervals, subchannels and a control channel, the method comprising: receiving the combined signal at a video receiver having a tuner for selecting between forward channels; receiving a control channel signal at a control channel receiver; tuning a subchannel transmitter responsive to the received control channel signal; altering the selection of the forward channel responsive to the control signal; and transmitting data from the subchannel transmitter.
Claim 8
Independent Claim
139 words
A method of receiving data transmitted over a cable television network, the network including a transmission medium and having forward channels for transmission of video signals having a rasterized format, the format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, at least one of the forward channels transmitting a combined signal of a data signal frequency interleaved with the bandwidth of a video signal in active intervals, subchannels and a control channel, the method comprising: receiving the combined signal at a video receiver having a tuner for selecting between forward channels; receiving a control channel signal at a control channel receiver; tuning a subchannel transmitter responsive to the received control channel signal; altering the selection of the forward channel responsive to the control signal; and transmitting data from the subchannel transmitter.
Claim 9
Dependent Claim
48 words
The method of claim 6, wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a chrominance subcarrier, and wherein the data signal portion of the combined signal is frequency interleaved with the video signal in the bandwidth at a frequency greater than the chrominance subcarrier.
Claim 10
Dependent Claim
53 words
The method of claim 6, wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a vestigial chrominance sideband, and wherein the data signal portion of the combined signal is frequency interleaved with the video signal in the bandwidth so that the data signal lies substantially within the vestigial chrominance sideband.
Claim 11
Dependent Claim
67 words
The method of claim 6, wherein the bandwidth includes luminance and chrominance components, and wherein the data signal portion of the combined signal is modulated with a carrier at an odd quarter, non-integral multiple of the frequency of the raster rate of the video signal so that the spectral energy of the modulated carrier is frequency interleaved with the chrominance and luminance components of the video signal.
Claim 12
Dependent Claim
18 words
The method of claim 6, the method further including extracting the data signal from the received combined signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |