Network for retrieval and video transmission of information
First Claim
1. A method of transmitting data over a video network, the network having a plurality of channels, at least some of the channels having a rasterized video signal format, each video signal format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, the method comprising:
- sending a signal having low information content over a low bandwidth channel from a first site;
receiving the signal at a second site;
selecting a volume of information to be transmitted to the first site responsive to the received signal;
furnishing the selected information at a high data rate;
combining the selected information at a high data rate within the bandwidth of a video signal during active intervals for transmission over the video network to provide a combined signal;
transmitting the combined signal through at least one of the channels; and
receiving the transmitted combined signal at the first site;
wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a chrominance subcarrier, the method further including combining the volume of information within the video signal bandwidth at a frequency greater than the chrominance subcarrier to produce a combined signal.
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Accused Products
Abstract
Signal processors for permitting the transparent, simultaneous transmission and reception of a volume of information in the video bandwidth is disclosed. The volume of data is selected in response to receiving a signal at a transmitter site. The signal processor in the transmitter rasterizes the volume of information at the horizontal scanning rate and modulates the volume of information with a data carrier at a non-integral multiple of the horizontal scanning rate to provide a frequency interleaved combined signal. The combined signal is transmitted during the active video portion of each video line.
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Citations
6 Claims
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1. A method of transmitting data over a video network, the network having a plurality of channels, at least some of the channels having a rasterized video signal format, each video signal format having a bandwidth and active video intervals, the active video intervals separated by horizontal blanking intervals, the method comprising:
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sending a signal having low information content over a low bandwidth channel from a first site; receiving the signal at a second site; selecting a volume of information to be transmitted to the first site responsive to the received signal; furnishing the selected information at a high data rate; combining the selected information at a high data rate within the bandwidth of a video signal during active intervals for transmission over the video network to provide a combined signal; transmitting the combined signal through at least one of the channels; and receiving the transmitted combined signal at the first site; wherein the bandwidth includes luminance and chrominance spectra, the chrominance spectra having a chrominance subcarrier, the method further including combining the volume of information within the video signal bandwidth at a frequency greater than the chrominance subcarrier to produce a combined signal.
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2. A transmitter for transmitting data over a video network, the network having a plurality of channels, each channel having a rasterized video signal format, each video signal format having a bandwidth and active video intervals and a color carrier, the active video intervals separated by horizontal blanking intervals, the transmitter comprising:
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means for sending a signal having low information content over a low bandwidth medium from a first site; a first receiving device for receiving the signal at a second site; means for selecting a volume of information to be transmitted to the first site responsive to the received signal; means for furnishing the selected information at a data rate of greater than about 100 Kilobits per second; means for combining the selected information within the bandwidth of a video signal above the color carrier during the active intervals for transmission over the video network to provide a combined signal; a transmission device for transmitting the combined signal through at least one of the channels; and a second receiving device for receiving the transmitted combined signal at the first site. - View Dependent Claims (3, 4, 5, 6)
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Specification