Universal TV Receiver Resampling for Multi-Standard IF Signals
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Solution Overview
Problem
Traditional television receivers are limited in their ability to process television signals from different broadcast standards due to the use of expensive SAW filters that cannot be integrated onto a chip, making them incapable of receiving signals from various television broadcast standards without additional processing.
Innovation Solution
A universal television receiver design that includes an analog processing block for filtering and amplifying multi-channel signals, an analog-to-digital converter for digitization, and a digital processing block for re-sampling to adjust the bandwidth to match the passband of a video filter, allowing for the reception of signals from various broadcast standards without a SAW filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a SAW filter is used to process television signals, then the frequency response is sharp and the passband corresponds to the bandwidth of the television signal, but the filter cannot be integrated onto a chip and is expensive
Solution Approach 1:
The patent replaces the mechanical SAW (Surface Acoustic Wave) filter with a digital signal processing system. The analog television signal is converted to digital form, and digital filtering algorithms are applied to achieve the desired frequency response. This substitution allows the filtering function to be implemented on integrated circuits while maintaining or improving performance characteristics.
Solution Approach 2:
The patent changes the operating parameters by transitioning from analog to digital domain processing. By sampling the analog signal at appropriate rates and applying digital filtering, the system achieves flexible bandwidth adjustment and sharp frequency response without requiring physical SAW filters. The digital approach allows parameter reconfiguration through software rather than hardware changes.
2Reliability
If a SAW filter is used in traditional television receivers, then the receiver can process signals according to a particular television broadcast standard, but the receiver cannot receive television signals from different television broadcast standards without further specialized processing
Solution Approach 1:
The patent implements a universal television receiver architecture that can process multiple television broadcast standards (NTSC, PAL, SECAM, and digital standards) through a single digital signal processing system. The digital filtering and signal processing algorithms can be reconfigured to handle different bandwidths and modulation types, eliminating the need for multiple specialized receivers or hardware filters for each standard.
Solution Approach 2:
The patent employs dynamic signal processing where the receiver can adapt its processing parameters based on the detected broadcast standard. The digital filtering characteristics, sampling rates, and processing algorithms are dynamically adjusted to match the requirements of the specific television standard being received, enabling flexible and accurate processing of various signal types.
3Adaptability or versatility
If specialized processing is added to support multiple broadcast standards, then the receiver can receive signals from different standards, but the device complexity increases
Solution Approach 1:
The patent replaces multiple specialized analog processing paths with a single digital signal processing system. Instead of having separate hardware chains for different broadcast standards, the system uses digital algorithms that can be software-configured to handle various standards, significantly reducing hardware complexity while maintaining multi-standard capability.
Data Source
AI summary
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.