Color slow-scan TV system and method
First Claim
1. A color slow-scan TV system, comprising:
- a transmitter having first memory means and first and second signal processing means, said first signal processing means being adapted to accept an encoded video input signal having chrominance and luminance components indicative of a color TV picture and digitizing the same, with said digitized signal being written into said first memory means, and said digitized signal being read out of said memory means by said second processing means in an orthogonal manner as a color slow-scan analog signal for transmission; and
a receiver having second memory means and third and fourth signal processing means, said third signal processing means being adapted to accept said color slow-scan analog signal transmitted by said transmitter and digitizing the same, with said digitized signal being written into said second memory means is an orthogonal manner, and said digitized signal being read out of said second memory means by said fourth processing means to reconstruct said color TV picture for display.
1 Assignment
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Accused Products
Abstract
A color slow-scan TV system and method are disclosed for selecting U.S. standard NTSC TV color pictures (or alternately other standards such as PAL or non-standard color TV) to be transmitted, transmitting the selected pictures utilizing slow-scan techniques, and reconstructing the pictures after transmission for display. The system includes a video compressor (transmitter) for receiving a composite video signal indicative of a color TV picture and providing therefrom a color slow-scan output signal indicative thereof, and a video expander (receiver) for receiving color slow-scan signals after transmission and providing therefrom a fast-scan output signal suitable for display of the color TV picture. The system and method include digitizing a selected video signal indicative of a TV color picture, writing the digitized information into a digital memory, reading out the memory through a digital-to-analog converter at a color slow-scan rate suitable for transmission on a transmission channel, receiving the transmitted color slow-scan signal and digitizing the received color slow-scan signal, writing the digitized color slow-scan information into a digital memory, and reading out the memory through a digital-to-analog converter at a fast-scan rate suitable for display on conventional color TV monitors using NTSC, PAL, or other standards.
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Citations
75 Claims
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1. A color slow-scan TV system, comprising:
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a transmitter having first memory means and first and second signal processing means, said first signal processing means being adapted to accept an encoded video input signal having chrominance and luminance components indicative of a color TV picture and digitizing the same, with said digitized signal being written into said first memory means, and said digitized signal being read out of said memory means by said second processing means in an orthogonal manner as a color slow-scan analog signal for transmission; and a receiver having second memory means and third and fourth signal processing means, said third signal processing means being adapted to accept said color slow-scan analog signal transmitted by said transmitter and digitizing the same, with said digitized signal being written into said second memory means is an orthogonal manner, and said digitized signal being read out of said second memory means by said fourth processing means to reconstruct said color TV picture for display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A color slow-scan TV system, comprising:
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video compressor means including first means for receiving a composite video input signal having chrominance and luminance components indicative of NTSC color TV picture information and digitizing the same, first digital memory means for accepting said digitized information from said first means and storing the same, and second means for accepting said digitized information stored in said first digital memory means with said digitized information being read out of said first digital memory means in an orthogonal manner to form therefrom a slow-scan TV analog output signal that includes both the luminance and chroma portions of said color TV picture information, said slow-scan output signal being adapted for transmission on a transmission channel; and video expander means including third means for receiving transmitted slow-scan signals indicative of color TV picture information from said video compressor means and digitizing the same, second digital memory means for accepting said digitized information from said third means and storing the same, and fourth means for reading out said digitized information from said second digital memory means at high speed and reconstructing therefrom said NTSC color TV picture information with said information being adapted to be displayed on a color TV monitor. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A color slow-scan TV system, comprising:
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transmitter means for receiving an encoder color video input signal indicative of a color TV picture and providing a color slow-scan analog output including luminance and chroma components indicative of said color TV picture, said transmitter means including clock means responsive to said color video input signal to provide a clock output that is phase-locked to said color video input signal, with said clock output controlling generation of said color slow-scan analog output; and receiver means for receiving said color slow-scan analog output from said transmitter means and providing a fast-scan output indicative of said color video input to said transmitter means, said receiver means including timing means for controlling generation of said fast-scan output so that said output is suitable for display of said color TV picture. - View Dependent Claims (30, 31, 32)
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33. A color slow-scan TV system, comprising:
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first input means for accepting a composite video input signal having chrominance and luminance components indicative of a NTSC color TV picture; first timing means; video processing means connected with said first input means and with said first timing means whereby an analog signal indicative of a still color TV picture is selected from said received composite video input signal; first converting means for converting said analog signal to digital form and providing a digital output signal; first memory means connected with said first converting means and said first timing means for storing said digital output signal from said first converting means; slow-scan means connected with said first memory means and said first timing means for accepting said digital signals stored at said first memory means and providing therefrom a color slow-scan analog output signal; means adapting said color slow-scan analog signal for transmission on a transmission channel; second input means for accepting said color slow-scan analog signal after transmission on a transmission channel; second timing means; second converting means for converting said received color slow-scan analog signal to digital form and providing a digital output signal; second memory means connected with said second converting means and said second timing means for storing said digital output signal from said second converting means; fast-scan means connected with said second memory means and said second timing means for accepting said digital signal stored at said second timing means and reconstructing therefrom said analog signal indicative of said color TV picture; and display means for displaying said color TV picture.
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34. In a color slow-scan TV system, a transmitter comprising:
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first signal processing means adapted to accept an encoded video input signal having chrominance and luminance components indicative of a color TV picture and digitizing the same; memory means connected with said first signal processing means for accepting said digitized signal therefrom; and second processing means connected with said memory means for reading out said memory means as a color slow-scan analog signal for transmission. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. In a color slow-scan TV system, a receiver comprising:
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first signal processing means adapted to accept color slow-scan analog signals having chrominance and luminance components and digitizing the same; memory means connected with said first signal processing means for accepting digitized signals from said first signal processing means; and second signal means connected with said memory means for reading out said memory means to reconstruct said color TV picture for display. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
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62. A method for transmitting and receiving color slow-scan TV signals, said method comprising:
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accepting an encoded video signal having chrominance and luminance components indicative of a color TV picture; digitizing said video input signal and entering said digitized signal into a first memory; reading out said digitized video signal from said first memory in an orthogonal manner as a color slow-scan analog signal; transmitting said color slow-scan analog signal; receiving said color slow-scan analog signal; digitizing said received color slow-scan analog signal and entering said digitized signal in a second memory; and reading out said digitized signal in said second memory to reconstruct the color TV picture for display. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
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74. A method for transmitting color slow-scan TV signals, said method comprising:
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accepting an encoded video input signal having chrominance and luminance components indicative of a color TV picture; digitizing said video input signal and entering said digitized signal into a memory; reading out said digitized video signal from said memory as a color slow-scan analog signal; and transmitting said color slow-scan analog signal.
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75. A method for receiving color slow-scan TV signals, said method comprising:
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receiving a color slow-scan analog signal having chrominance and luminance components indicative of a transmitted color TV picture; digitizing said received color slow-scan analog signal; entering said digitized information into a memory; and reading out said digitized information from said memory to reconstruct said color TV picture for display.
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Specification