Patent ID: 7088376

Claim:
An apparatus for processing a signal, comprising: a signal dispensing unit dispensing a first personal computer signal output from a personal computer in the form of a first analog signal directly from said personal computer; an analog to digital converter converting the first analog signal from said signal dispensing unit of said personal computer to a first digital signal of said personal computer; a signal processing unit performing picture-in-picture signal processing enabling one of the first digital personal computer signal dispensed by said signal dispensing unit through said analog to digital converter and a decoded second signal as a second digital signal input from an outside source to be displayed on a main screen and the other to be displayed on at least one sub-screen, and said signal processing unit processing said second digital signal to be displayed alone on said main screen, said second digital signal being any one of a television signal and a video signal; a digital to analog converter converting a digital output signal of said signal processing unit into a second analog signal; an outputting unit directly connected to said digital to analog converter and directly connected to said signal dispensing unit of said personal computer, receiving said first analog signal from said signal dispensing unit and said second analog signal from said digital to analog converter converting said digital output signal from said signal processing unit, outputting the first analog signal dispensed from said signal dispensing unit in response to a control signal for displaying only the first personal computer signal, and outputting said second analog signal from said digital output signal of said signal processing unit in response to a control signal for displaying the first personal computer signal and said second signal in picture-in-picture format; and a monitor amplifying the signal output from said outputting unit to be displayed.