Universal TV Receiver Resampling SAW Filter Elimination

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Solution Overview

Problem

Traditional television receivers are limited in their ability to process signals from different television 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 standards without additional processing.

Innovation Solution

A universal television receiver design that includes an analog processing block for filtering and amplifying signals, an analog-to-digital converter for digitization, and a digital processing block for re-sampling to adjust the bandwidth, allowing it to process signals from multiple broadcast standards without a SAW filter, enabling integration on a single IC and reduced component performance constraints.

Engineering Contradictions & Design Principles

VSEngineering 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 relatively expensive

Engineering Contradiction:

Improvefrequency response sharpnessVSAvoidintegrability onto chip

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical SAW filter with a digital signal processing system consisting of an ADC, digital down-converter, and resampling circuitry. This substitution eliminates the need for expensive, non-integrable SAW filters while achieving the same frequency selection function through digital processing, thereby enabling integration onto a single chip.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters by converting from analog frequency filtering to digital sampling rate manipulation. By varying the resampling rate dynamically, the system achieves different passband widths corresponding to different television broadcast standards, replacing the fixed physical characteristics of SAW filters with programmable digital parameters.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If a SAW filter is used in traditional television receivers, then the receiver can process signals with sharp frequency response, but the receiver cannot receive television signals from different broadcast standards without further specialized processing

Engineering Contradiction:

Improvefrequency responseVSAvoidcompatibility with different broadcast standards

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal receiver architecture that can handle multiple television broadcast standards (NTSC, PAL, SECAM, ATSC, DVB-T, ISDB-T) through a single digital processing path. The resampling circuitry dynamically adjusts the sampling rate to match the bandwidth requirements of different standards, eliminating the need for multiple specialized filters or processing paths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system employs dynamic resampling rate adjustment to adapt to different broadcast standards. The sampling rate is varied in real-time based on the detected standard, allowing the same hardware to optimally process signals with different bandwidths and modulation characteristics, providing both precision and versatility.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If multiple specialized processing components are added to support different broadcast standards, then the receiver can receive various standards, but the device complexity increases

Engineering Contradiction:

Improveability to receive different broadcast standardsVSAvoidnumber of specialized processing components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the functions of multiple specialized processing components into a single integrated digital signal processing chain. Instead of having separate processing paths for different broadcast standards, the system uses one ADC followed by a programmable digital down-converter and resampler that can be configured via software to handle any standard, significantly reducing component count and complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9253435B2Method and apparatus for extracting a desired television signal from a wideband IF input using re-sampling

Publication Date: 2016.02.02 PARADE TECHNOLOGIES LTD

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.