Abstract: An image signal processor and a method for processing an image signal thereof are disclosed. When the image signal processor executes an automatic chroma gain control (ACC), the image signal processor adjusts a variable rate of ACC gain according to a size of an input color signal to reduce a time for processing the ACC. Even if a difference between the size of the input color signal and the size of a reference color signal is large, the ACC is rapidly processed. As a result, transient phenomenon disappears from a screen.

Abstract: An image processing apparatus is provided, including: a first image processing unit which converts an input image signal into a brightness signal and a chromaticity signal; and a second image processing unit which adjusts a bandwidth used to filter the chromaticity signal to correspond to a noise level of the image signal, and filters the chromaticity signal with the adjusted bandwidth to extract a chrominance signal.

Abstract: An image processing apparatus is provided, including: a first image processing unit which converts an input image signal into a brightness signal and a chromaticity signal; and a second image processing unit which adjusts a bandwidth used to filter the chromaticity signal to correspond to a noise level of the image signal, and filters the chromaticity signal with the adjusted bandwidth to extract a chrominance signal.

Abstract: A broadcast receiving device and method are provided with a function for displaying closed caption data. The broadcast receiving device according to embodiments of the present invention includes a signal receiving part for receiving a composite video signal, a signal processing part for signal-processing the composite video signal and converting the signal into an output format signal, a noise calculating part for calculating the noise level of the composite video signal, and a caption data detecting part for detecting closed caption data from the composite video signal and if the noise level is less than a threshold level, only then providing the closed caption data to the signal processing part to be inserted in the output format signal. Accordingly, noise degradation of the image quality can be prevented.

Abstract: An image signal processor and a method for processing an image signal thereof are disclosed. When the image signal processor executes an automatic chroma gain control (ACC), the image signal processor adjusts a variable rate of ACC gain according to a size of an input color signal to reduce a time for processing the ACC. Even if a difference between the size of the input color signal and the size of a reference color signal is large, the ACC is rapidly processed. As a result, transient phenomenon disappears from a screen.

Abstract: Dynamic focusing is performed at Nyquist rate FN for the received signal. For each imaging point, a single-bit SDM sample is selected from each active array channel, according to the corresponding focusing delay. A block of data, centered at the selected SDM sample, is defined for each channel. Next, bit-wise block addition is performed to obtain the sum of all the blocks. The block addition output is fed to the demodulation filter. K(=?L/M?) demodulation filters are used. In another approach, the demodulation filters are placed just behind sigma-delta modulators. In each channel, K filters produce successively the demodulated signals for K consecutive imaging points. By taking the sum of samples retrieved from the same memory locations, dynamic focusing is achieved. Since each demodulation filter takes a single-bit SDM sequence as an input data, a simple accumulator calculates the sum of filter coefficients to be multiplied by input samples.

Abstract: A broadcast receiving device and method are provided with a function for displaying closed caption data. The broadcast receiving device according to embodiments of the present invention includes a signal receiving part for receiving a composite video signal, a signal processing part for signal-processing the composite video signal and converting the signal into an output format signal, a noise calculating part for calculating the noise level of the composite video signal, and a caption data detecting part for detecting closed caption data from the composite video signal and if the noise level is less than a threshold level, only then providing the closed caption data to the signal processing part to be inserted in the output format signal. Accordingly, noise degradation of the image quality can be prevented.

Abstract: A multiplierless single-bit dynamic focusing method is presented which can completely eliminate the demodulation error. In the proposed method, dynamic focusing is performed at the Nyquist rate, FN, for the received signal, meaning that the time interval between successive imaging points is the reciprocal of FN. For each imaging point, a single-bit SDM sample is selected from each active array channel, according to the corresponding focusing delay. Then, a block of data, centered at the selected SDM sample, is defined for each channel. Next, bit-wise block addition is performed to obtain the sum of all the blocks. Finally, the output of the block addition is fed to the demodulation filter. In consequence, if the block length is set equal to the demodulation filter length, the proposed method will produce the focused signal without any signal distortion.