Multi-video/audio system and method of controlling the same

A multi-video/audio system comprising:

• system control means for controlling the entire operation of the system;
• memory means for storing system information necessary to the operation of said system control means, accounting data, a terminal identification number and time;
• clock generation means for generating a clock signal to said system control means;
• battery backup means for supplying auxiliary power to said memory means and said clock generation means when the supply of main power thereto is blocked, so that said memory means and said clock generation means can maintain their original functions;
• card input/output means for ascertaining a card identification number, a card private number and deposit balance of the user in response to a card reader control signal from said system control means and issuing a service receipt in response to a print control signal from said system control means for a charged service;
• data modem means for transmitting/receiving a modem signal of various data information to/from a data base connected to a cable television network in response to a data modem control signal from said system control means;
• network interface means for performing an interfacing operation between said data modem means and said cable television network in response to a network interface control signal from said system control means;
• television video/audio signal generation means for receiving a high frequency signal from said cable television network through said network interface means, selecting one of a plurality of channels corresponding to the received high frequency signal, generating television video and audio signals of the selected channel and separating the generated television video signal into red, green and blue color signals and a synchronous signal to be used in a general color monitor;
• audio signal amplification means for amplifying one of the television audio signal from said television video/audio signal generation means and a compact disk audio signal and outputting the amplified audio signal to a speaker or a head phone in response to a volume/tone quality control signal and a speaker/head phone switching signal;
• compact disk control means for exchanging a compact disk with another one in response to a compact disk exchange control signal from said system control means, loading the exchanged compact disk and outputting a compact disk control signal to said system control means;
• compact disk video/audio signal generation means for extracting red, green and blue color signals and a synchronous signal from video data from said compact disk control means read by said system control means in response to a compact disk video control signal from said system control means, extracting the compact disk audio signal from audio data from said compact disk control means read by said system control means in response to a compact disk audio control signal from said system control means and outputting the extracted compact disk audio signal to said audio signal amplification means;
• video signal switching means for selectively outputting the red, green and blue color signals and the synchronous signal from said television video/audio signal generation means and the red, green and blue color signals and the synchronous signal from said compact disk video/audio signal generation means to the color monitor;
• key input means including a key pad for inputting key information selected by the user and a key interface unit for transferring the key information inputted by said key pad to said system control means;
• and
• power supply means including a power switch for turning on/off alternating current power and a direct current power supply for receiving the alternating current power through said power switch and supplying direct current power as the main power to said components in the system.