Patent ID: 8902365
Filing Date: 2014-12-02
Classification: H04N

Abstract:
1. A television receiver for processing a first signal to provide video and audio information for a desired television channel, wherein the television receiver comprises: an Analog to Digital Converter (ADC) configured to digitize the first signal at a sampling rate to produce a second signal, the sampling rate being adjustable; a digital processing block coupled to the ADC and configured to process the second signal to obtain the video and audio information for the desired television channel, the digital processing block being configured to apply an input resampling ratio at an input of the digital processing block to convert the second signal to a nominal sampling rate used by processing elements of the digital processing block and to apply an output resampling ratio at an output of the digital processing block to convert an output signal to a different output sampling rate, wherein during use an interferer may be aliased onto the desired television channel due to digitization, and the television receiver is configured to adjust the sampling rate to frequency shift the aliased interferer away from the desired television channel and the digital processing block is configured to apply the resampling ratios to compensate for the adjusted sampling rate, and wherein the digital processing block comprises input and output polyphase filters and the processing elements therebetween, the input polyphase filter applying the input resampling ratio to the second signal and the output polyphase filter applying the output resampling ratio to the output signal; an RF processing block configured to amplify and mix received television signals to generate a multi-channel television signal, the RF processing block comprising a mixing stage having a local oscillator that provides a variable oscillation frequency used for mixing; and an analog processing block configured to provide coarse filtering and amplification to the multi-channel television signal to produce the first signal, wherein, in addition to adjusting the sampling rate, the receiver is configured to change the variable oscillation frequency to frequency shift the aliased interferer away from the desired television channel, and the digital processing block is configured to apply the resampling ratios and track frequency shifts in the desired television channel.