Caption VCR and method of displaying a caption signal in the caption VCR
First Claim
1. A caption display apparatus for a VCR, comprising:
- programmable controlling means for providing a plurality of control signals necessary to the VCR under control of a user;
radio frequency converting means for receiving an external broadcasting signal and outputting the received broadcasting signal or a desired signal under control of said programmable controlling means;
tuning mean for tuning an output signal from said radio frequency converting means to a broadcasting channel required by the user under control of said programmable controlling means, demodulating the tuned signal to divide it into a video signal and an audio signal and outputting the divided video signal and audio signal;
first switching means for selectively outputting the video signal from said tuning means or an external video signal under control of said programmable controlling means;
luminance/chrominance processing means for video-processing an output signal from said first switching means or a self-video signal to be placed back under control of said programmable controlling means;
luminance/chrominance detecting means for outputting a desired control signal to said programmable controlling means according to whether an output signal from said luminance/chrominance processing means is present and separating vertical and horizontal synchronous signals form the output signal from said luminance/chrominance processing means if the output signal from said luminance/chrominance processing means is present;
clamping means for clamping the output signal from said luminance/chrominance processing means at a constant voltage level;
noise attenuating means for attenuating a noise containing int he output signal form said luminance/chrominance processing means for the purpose of easiness of decoding of a caption signal form the output signal form said luminance/chrominance processing means;
caption decoding means receiving an output signal form said noise attenuating means and detecting the caption signal containing screen data and character data from the output signal from said noise attenuating means under control of said programmable controlling means;
second switching means for selectively outputting on of an output signal form said clamping means and an output signal form a DC voltage supplying means for supplying a desired DC voltage to said second switching means,wherein said second switching means is under control of said caption decoding means and wherein said DC voltage supplying means supplies a desired DC voltage to said second switching means only when the caption signal from said caption decoding means is applied to said second switching means;
on-screen displaying means for displaying an output signal from said second switching means under said vertical and horizontal synchronous signals of said programmable controlling means and a control of said luminance/chrominance detecting means; and
third switching means for blocking the output signal from said caption decoding means to said second switching means under control of said programmable controlling means.
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Accused Products
Abstract
A caption VCR having a caption decoder, therein, for detecting a caption signal from a broadcasting signal or detecting a caption signal recorded on a VCR tape. The caption VCR normally operates to display a video signal having no caption signal. However, if the caption signal including character and screen data is detected by the caption decoder, the caption VCR displays the caption signal including the character and screen data. Also, a method of displaying the caption signal from the caption decoder together with an audio signal and a video signal in the caption VCR is provided. Therefore, it is convenient for the deaf person or foreign language learner to watch a desired image containing the caption signal on the screen utilizing the caption decoder.
131 Citations
10 Claims
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1. A caption display apparatus for a VCR, comprising:
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programmable controlling means for providing a plurality of control signals necessary to the VCR under control of a user; radio frequency converting means for receiving an external broadcasting signal and outputting the received broadcasting signal or a desired signal under control of said programmable controlling means; tuning mean for tuning an output signal from said radio frequency converting means to a broadcasting channel required by the user under control of said programmable controlling means, demodulating the tuned signal to divide it into a video signal and an audio signal and outputting the divided video signal and audio signal; first switching means for selectively outputting the video signal from said tuning means or an external video signal under control of said programmable controlling means; luminance/chrominance processing means for video-processing an output signal from said first switching means or a self-video signal to be placed back under control of said programmable controlling means; luminance/chrominance detecting means for outputting a desired control signal to said programmable controlling means according to whether an output signal from said luminance/chrominance processing means is present and separating vertical and horizontal synchronous signals form the output signal from said luminance/chrominance processing means if the output signal from said luminance/chrominance processing means is present; clamping means for clamping the output signal from said luminance/chrominance processing means at a constant voltage level; noise attenuating means for attenuating a noise containing int he output signal form said luminance/chrominance processing means for the purpose of easiness of decoding of a caption signal form the output signal form said luminance/chrominance processing means; caption decoding means receiving an output signal form said noise attenuating means and detecting the caption signal containing screen data and character data from the output signal from said noise attenuating means under control of said programmable controlling means; second switching means for selectively outputting on of an output signal form said clamping means and an output signal form a DC voltage supplying means for supplying a desired DC voltage to said second switching means, wherein said second switching means is under control of said caption decoding means and wherein said DC voltage supplying means supplies a desired DC voltage to said second switching means only when the caption signal from said caption decoding means is applied to said second switching means; on-screen displaying means for displaying an output signal from said second switching means under said vertical and horizontal synchronous signals of said programmable controlling means and a control of said luminance/chrominance detecting means; and third switching means for blocking the output signal from said caption decoding means to said second switching means under control of said programmable controlling means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method carried out within a VCR of displaying along with a video signal a caption signal representing conversation and other audible sounds associated with the video signal in a caption VCR, comprising the steps of:
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(a) luminance/chrominance-processing for video-processing a video signal inputted to the VCR; (b) clamping the luminance/chrominance-processed video signal at a constant voltage level, then transmitting the clamped video signal to a display unit and continuously displaying the clamped video signal int eh display unit; (c) simultaneously with the clamping of the luminance/chrominance-processed video signal, continuously decoding the luminance/chrominance-processed video signal to detect a caption signal form the luminance/chrominance-processed video signal and separating a screen data signal and a character data signal present in a detected caption signal; and (d) when screen data of a caption signal which identifies a caption area on a screen is detected, displaying the screen data of the caption signal along with the video signal in the display unit, and when the character data of a caption signal is detected, displaying the character data within the caption area. - View Dependent Claims (8, 9, 10)
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Specification