Patent ID: 8274606

Claim:
A video receiving apparatus for receiving an analog video signal comprising first analog channel data and second analog channel data, the video receiving apparatus comprising: a switch selectively coupled to a first channel or a second channel so as to transmit the first analog channel data within a plurality of first periods and to transmit the second analog channel data within a plurality of second periods; an analog-to-digital converter (ADC) coupled to the switch for receiving the first analog channel data from the switch within the first periods and the second analog channel data from the switch within the second periods respectively, and performing analog-to-digital conversion on the first analog channel data and the second analog channel data according to a sampling frequency to output a digital video signal, wherein the sampling frequency is a plurality of times of a switching frequency of the switch; a video processing circuit coupled to the ADC, wherein the video processing circuit comprises: a recovery circuit for restoring the digital video signal to a recovery video signal corresponding to a video format of the analog video signal; and a noise reduction circuit for reducing noise generated by the switch according to the digital video signal; and a decoder coupled to the video processing circuit for outputting a display signal according to the recovery video signal; wherein the digital video signal comprises a plurality of first sampling channel data sets and second sampling channel data sets, the ADC continuously samples the first analog channel data sets a plurality of times in each of the first periods to obtain the first sampling channel data sets and the ADC continuously samples the second analog channel data sets a plurality of times in each of the second periods to obtain the second sampling channel data sets, wherein the recovery video signal comprises first digital channel data correspond to the first analog channel data and second digital channel data corresponding to the second analog channel data, and the noise reduction circuit calculates the average value of the first sampling channel data sets as the first digital channel data in each of the first periods and calculates the average value of the second sampling channel data sets as the second digital channel data in each of the second periods.