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

A method 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 method comprises:

• filtering and amplifying a multi-channel television signal to produce a coarse channel signal;
• digitizing the coarse channel signal to produce a digitized coarse channel signal;
• and
• processing the digitized coarse channel signal to obtain 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 during digitization, 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 method further comprises re-sampling 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 processing the digitized coarse channel signal comprises:
• processing the digitized coarse channel signal to provide a processed digitized coarse channel signal as the processed version of the digitized coarse channel signal;
• 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
• processing the processed digitized coarse channel signal or a frequency-shifted version of the processed digitized coarse channel signal to provide the audio information content of the desired television channel signal for analog television broadcast standards.

A receiver for processing transmission signals to provide at least one of video and audio information for a desired channel signal, the transmission signals being transmitted according to any one of a plurality of transmission standards, wherein the receiver comprises:

• an analog processing block for filtering and amplifying a multi-channel 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 at least one of video and audio information for the desired channel signal, wherein the digital processing block comprises a video filter and, for analog and digital transmission standards, re-samples 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 channel signal to generally correspond to a normalized passband of the video filter;
• wherein the digital processing block comprises an audio filter and, for analog transmission standards, 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 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 channel signal for analog transmission standards or the audio and video information of the desired channel signal for digital transmission 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 channel signal for analog transmission standards.

A method for processing transmission signals to provide at least one of video and audio information for a desired channel signal, the transmission signals being transmitted according to any one of a plurality of transmission standards, wherein the method comprises:

• filtering and amplifying a multi-channel signal to produce a coarse channel signal;
• digitizing the coarse channel signal to produce a digitized coarse channel signal;
• and
• processing the digitized coarse channel signal to obtain the at least one of video and audio information for the desired channel signal, wherein for analog and digital transmission 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 during digitization, to adjust a normalized bandwidth of the desired channel signal to generally correspond to a normalized passband of a video filter;
• wherein for analog transmission standards, the method further comprises re-sampling 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 channel signal to generally correspond to a normalized passband of an audio filter;
• and
• wherein the step of processing the digitized coarse channel signal comprises:
• processing the digitized coarse channel signal to provide a processed digitized coarse channel signal as the processed version of the digitized coarse channel signal;
• processing the processed digitized coarse channel signal to provide the video information of the desired channel signal for analog transmission standards or the audio and video information of the desired channel signal for digital transmission standards;
• 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 channel signal for analog transmission standards.