Abstract: An audio apparatus includes a signal receiver configured to receive a left-channel signal and a right-channel signal of a stereo audio signal; at least one filter configured to block a signal in a band exceeding a predetermined frequency based on the frequency bands of each of the received left-channel signal and right-channel signal; and a controller configured to generate a center-channel signal of the stereo audio signal based on the left-channel signal and the right-channel signal passing through the filter, to calculate a signal level sensitivity between the left-channel signal and the right-channel signal passing through the filter, to determine a similarity between the left-channel signal and the right-channel signal based on the calculated signal level sensitivity, and to control the generated center-channel signal to be output in response to the determined similarity.

Abstract: A password (PW) restriction apparatus for cable television (CT) channels having a downward receiving signal controller (DRSC) for receiving a downward receiving signal output from a cable television transmitting/receiving portion (CTTRP) and transmitting digital signals to control the generation of video and audio (V and A) signals; a television/audio decoder (TAD) for decoding the digital signals to generate V and A; a central processing unit (CPU) for processing (PW) for enabling a user to at least select one of changing a password channel (PWC) and processing a new PW from the CTTRP; an upward transmitting signal controller for multiplexing a user-controlled signal and maintenance signal output from the CPU and transmitting the multiplexed signals to the CTTRP; an on-screen display controller for generating a user-controlled screen (UCS) on a user television screen and transmitting the generated USC to the TAD; a user-operated key pad for generating password channel selection (PWCS) and password channel re

Abstract: An on-screen signal generating apparatus for a cable television system is capable of displaying the control commands from a remote control while watching television. A memory circuit stores color information for each pixel needed for displaying the control commands on the screen. A main control circuit receives the color information stored in the memory circuit for output to RGB latches, and generates input/output port selection signals and writing signals for latches. The latches output the pixel data to D/A convertors for converting the display data to analog format. The analog signals are then combined with the original video signal.