Additional information superimposition device
First Claim
1. An additional information signal superimposition device comprising:
- spectral spread signal generation means for generating a spectral spread additional information signal by spectrally spreading an additional information signal;
spectral spread signal detection means for detecting the spectral spread additional information signal superimposed on an input information signal; and
superimposition means for receiving said spectral spread additional information signal from said spectral spread generation means and for additionally superimposing said spectral spread additional information signal on said input information signal when it is determined based on the detection result obtained by said spectral spread signal detection means that said spectral spread additional information signal is not superimposed on said input information signal to a predetermined threshold value of correlation.
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Accused Products
Abstract
Additional information is superimposed consistently while the disturbance of a picture due to excessive superimposition is suppressed. The device superimposes a spectrally spread additional information on a video signal. Inverse spread processing is performed on the video signal, and an SS additional information detection circuit detects whether additional information is superimposed already on the video signal. Based on the detection result performed by the additional information detection circuit, superimposition of the spectrally spread signal supplied from the spectrally spread signal generator on the video signal is controlled. A superimposition control method such as superimposition ON/OFF control, superimposition level control, or spread code string control is performed.
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Citations
8 Claims
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1. An additional information signal superimposition device comprising:
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spectral spread signal generation means for generating a spectral spread additional information signal by spectrally spreading an additional information signal; spectral spread signal detection means for detecting the spectral spread additional information signal superimposed on an input information signal; and superimposition means for receiving said spectral spread additional information signal from said spectral spread generation means and for additionally superimposing said spectral spread additional information signal on said input information signal when it is determined based on the detection result obtained by said spectral spread signal detection means that said spectral spread additional information signal is not superimposed on said input information signal to a predetermined threshold value of correlation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification