Patent ID: 6483550
Filing Date: 2002-11-19
Classification: H04N

Abstract:
An analog-to-digital converter for converting a video signal comprising:an A-D converter circuit for converting an analog television signal to a 2n-bit digital signal, a synchronizing signal detecting circuit for detecting a synchronizing signal in a digital signal received from the A-D converter circuit, a Y/C separating circuit for separating a luminance signal and a carrier chrominance signal from the digital signal received from the A-D converter circuit utilizing a synchronizing signal supplied from the synchronizing signal detecting circuit, a synchronizing signal converter circuit for converting a synchronizing signal portion of the luminance signal received from the Y/C separating circuit to a predetermined value, and digital amplifying circuit for amplifying a signal level of a signal received from the synchronizing signal converter circuit to a predetermined signal level in compliance with a standard for communication or a standard for an apparatus using a video signal, a low pass filter for passing a predetermined low frequency component in a digital signal received from the digital amplifying circuit, a control section for detecting a predetermined characteristic of an input signal and outputting a control signal corresponding to a detected value, and a selector circuit for selecting one of an output signal from the digital amplifying circuit and an output signal from the low pass filter in response to the control signal from the control section.