Processor for receiving data from a video signal
First Claim
1. 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.
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Accused Products
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.
209 Citations
10 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. 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:
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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. - View Dependent Claims (7, 8, 9, 10)
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Specification