Wideband tuner architecture

What is this patent about?

’362 is related to the field of wideband radio frequency receivers, specifically those designed to capture multiple television channels simultaneously. In traditional tuner architectures, receiving non-contiguous channels across a broad spectrum requires either multiple narrow-band tuners or a single wideband tuner that passes a massive amount of data to a demodulator. This often results in a bottleneck where the demodulator must expend significant processing power and dynamic range to filter out a large number of undesired channels from the digitized stream.

The underlying idea behind ’362 is to shift the burden of channel selection from the demodulator to a specialized digital frontend located immediately after a wideband digitization stage. By using a high-speed analog-to-digital converter to capture a broad swath of the spectrum—including both desired and undesired channels—the system can then use digital logic to isolate only the specific frequencies of interest. This allows the receiver to discard unwanted spectral content early in the signal chain, effectively reducing the data rate and dynamic range requirements for subsequent processing stages.

The claims of ’362 focus on a wideband receiver architecture that utilizes a mixer module to downconvert a broad range of frequencies containing multiple desired and undesired television channels. A wideband ADC module then digitizes this entire frequency block. The invention is characterized by digital circuitry that is specifically configured to select the desired channels from the aggregate digitized signal and output them to a demodulator as a streamlined digital datastream, rather than passing the entire digitized spectrum.

In practice, the system employs a complex mixer to down-shift the RF spectrum to a low-IF or zero-IF baseband, which is then sampled by the ADC. Once in the digital domain, a bank of numerically controlled oscillators and complex mixers frequency-shifts each desired channel to baseband for individual filtering and decimation. This granular approach allows the system to handle non-contiguous channels—such as those spread across VHF and UHF bands—by treating them as discrete digital entities that can be processed in parallel.

This invention differentiates itself from prior approaches by eliminating the need for expensive, high-power data conversion at the demodulator interface. Instead of requiring the demodulator to filter a wide, noisy pipe of data, the ’362 system provides a contiguous digital representation of only the relevant channels. Furthermore, by optionally using a tiled up-conversion module, the system can repackage these non-contiguous channels into a tight, synthetic frequency band, making it compatible with legacy hardware while maintaining high signal integrity.