Signal processors for transparent and simultaneous transmission and reception of a data signal in a video signal
First Claim
Patent Images
1. A method of transmitting information, the method comprising:
- receiving the information from a source;
generating a carrier at an odd quarter, non-integral multiple of the frequency of a raster rate of a rasterized video signal, the rasterized video signal having a bandwidth having spectral energy having chrominance and luminance components;
modulating the carrier based upon the received information so that the spectral energy of the modulated carrier is frequency interleaved with the chrominance and luminance components to provide a modulated signal;
injecting the modulated signal into the video signal bandwidth; and
transmitting the injected signal in a channel containing a signal format of said rasterized video signal.
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Abstract
Signal processors for permitting the transparent, simultaneous transmission and reception of a data signal in the video bandwidth is disclosed. The signal processor in the transmitter rasterizes the data at the horizontal scanning rate and modulates the data with a data carrier at a non-integral multiple of the horizontal scanning rate to obtain frequency interleaving. The data is transmitted during the active video portion of each video line.
227 Citations
45 Claims
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1. A method of transmitting information, the method comprising:
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receiving the information from a source; generating a carrier at an odd quarter, non-integral multiple of the frequency of a raster rate of a rasterized video signal, the rasterized video signal having a bandwidth having spectral energy having chrominance and luminance components; modulating the carrier based upon the received information so that the spectral energy of the modulated carrier is frequency interleaved with the chrominance and luminance components to provide a modulated signal; injecting the modulated signal into the video signal bandwidth; and transmitting the injected signal in a channel containing a signal format of said rasterized video signal. - View Dependent Claims (2)
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3. A method of transmitting an image through a channel having a video signal format, the video signal format having a bandwidth, the bandwidth having luminance and chrominance spectral components, the chrominance component having a chrominance subcarrier and a vestigial chrominance sideband, the method comprising:
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modulating a data carrier based upon data representative of the image to provide a modulated signal; inserting the modulated signal into the bandwidth of a video signal of the channel at a frequency greater than the chrominance subcarrier during the active video intervals of the video signal to form a combined signal; transmitting the combined signal through the channel; extracting the modulated signal from the transmitted combined signal; demodulating the extracted modulated signal based upon detection of active video intervals in the video signal to provide a demodulated signal; and displaying the image on a display responsive to the demodulated signal. - View Dependent Claims (4, 5)
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6. A method of transmitting information through a plurality of video channels, each channel 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, each bandwidth having luminance and chrominance spectral components, each chrominance component having a chrominance subcarrier, the method comprising:
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receiving the information from more than one source; packetizing the received information to provide digital data packets; injecting signals containing the packets from different sources into the video signal in the bandwidth of a video signal above the respective chrominance subcarriers of at least two channels during active intervals; and transmitting the injected signals in the channels. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of transmitting information through a plurality of video channels having rasterized video signal formats, each video signal format having a bandwidth and active intervals, the active intervals separated by horizontal blanking intervals, each bandwidth having luminance and chrominance spectral components, each chrominance component having a chrominance subcarrier, the method comprising:
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packetizing data representative of the information to provide digital data packets; injecting signals containing the packets from different sources into the bandwidth of the video signal of at least two channels above the chrominance subcarrier of each channel during the active video intervals of the video signal to form combined signals; and transmitting each combined signal through the channels. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An encoder for sending information received from a plurality of sources, through a plurality of video channels, each channel 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, each bandwidth having luminance and chrominance spectral components, each chrominance component having a chrominance subcarrier, the transmitter comprising:
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means for packetizing the received information to provide digital data packets; means for injecting signals incorporating the packetized information from different sources into the video signal bandwidth above the chrominance subcarriers of at least two channels during active video intervals; and means for transmitting the injected signals in the channels. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. An encoder for transmitting information through a plurality of video channels having rasterized video signal formats, each video signal format having a bandwidth active intervals, the active intervals separated by horizontal blanking intervals, each bandwidth having luminance and chrominance spectral components, each chrominance component having a chrominance subcarrier, the encoder comprising:
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means for packetizing data representative of the information to provide digital data packets; means for determining on which channel to transmit the information from a source; means for inserting signals containing the packets from different sources into the video signal bandwidth above the chrominance subcarrier during active video intervals of the video signal to form combined signals; means for transmitting each combined signal through the channels; means for extracting the inserted signal from each transmitted combined signal; and means for determining on which channel to place the information from a source. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification