Method and apparatus for extracting a desired television signal from a wideband IF input using re-sampling

摘要

Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals, that are transmitted according to a variety of broadcast standards, to provide video and audio information for a desired television channel signal. The processing includes producing a coarse channel signal that includes a desired television channel signal and then applying resampling techniques to adjust a normalized bandwidth of the desired television channel signal to generally correspond to the normalized passband of a main filter that is used for each of the broadcast standards.

主权项

1. A television receiver for processing television signals to provide video and audio information for a desired television channel signal, the television signals being transmitted according to any one of a variety of television broadcast standards, wherein the television receiver comprises:
an analog processing block for filtering and amplifying a multi-channel television signal to produce a coarse channel signal; an analog to digital converter (ADC) coupled to the analog processing block for digitizing the coarse channel signal to produce a digitized coarse channel signal; and a digital processing block coupled to the ADC for processing the digitized coarse channel signal to obtain the video and audio information for the desired television channel signal, wherein for analog and digital television broadcast standards, the processing comprises re-sampling a processed version of the digitized coarse channel signal at a first new sampling rate, with respect to a sampling rate employed by the ADC, to adjust a normalized bandwidth of the desired television channel signal to generally correspond to a normalized passband of a video filter; wherein for analog television broadcast standards the digital processing block re-samples the processed version of the digitized coarse channel signal at a second new sampling rate to adjust a normalized bandwidth of the audio information of the desired television channel signal to generally correspond to a normalized passband of an audio filter; and wherein the digital processing block comprises: an input filtering block for processing the digitized coarse channel signal to provide a processed digitized coarse channel signal as the processed version of the digitized coarse channel signal; a video processing block for receiving and processing the processed digitized coarse channel signal to provide the video information of the desired television channel signal for analog television broadcast standards or the audio and video information of the desired television channel signal for digital television broadcast standards; and an audio processing stage for receiving and processing the processed digitized coarse channel signal or a frequency shifted version of the processed digitized coarse channel signal to provide the audio information of the desired television channel signal for analog television broadcast standards.