Adjustable DSP Data Rate for TV Tuner Noise Reduction

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Solution Overview

Problem

Digital signal processing in television tuners introduces noise due to electromagnetic and power supply interference, affecting the fidelity of baseband video and audio signals, and existing noise filtering methods are resource-intensive and time-consuming.

Innovation Solution

The television tuner adjusts the data rate of digitized data by varying the sampling rate based on the selected channel, using a resampling module and data rate lookup table to minimize noise interference, which is dependent on the frequency band of the channel of interest.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If digital signal processing is performed at high data rate, then processing efficiency is improved, but noise interference increases

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidnoise interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the data rate adjustable rather than fixed. The system dynamically changes the data rate based on the selected channel frequency, allowing optimization between processing efficiency and noise reduction for different operating conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the data rate parameter according to the channel frequency. By adjusting this critical parameter, the system achieves different operating points that balance processing speed and noise levels, resolving the contradiction between efficiency and noise interference

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If noise filtering is applied to baseband signals, then signal fidelity is improved, but processing time and resource consumption increase

Engineering Contradiction:

Improvesignal fidelityVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by reducing noise at the source (during digital signal processing) rather than filtering it later. By optimizing the data rate to minimize noise generation in the first place, the system avoids the need for time-consuming post-processing filtering operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful effect of data rate on noise into a beneficial control mechanism. By deliberately adjusting the data rate, the system uses the source of noise as a control parameter to achieve noise reduction, eliminating the need for separate filtering operations

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS20130223572A1Digital signal processor with adjustable data rate and methods thereof

Publication Date: 2013.08.29 PARADE TECHNOLOGIES LTD

AI summary

As a digitized representation of an intermediate frequency television signal moves through a demodulator it undergoes a number of processes, including conversion from an analog signal to a digitized data, digital signal processing of the digitized data, and the like. The rate at which the digitized data moves through the digital signal processor of the demodulator for processing is referred to as the data rate of the DSP. The demodulator can vary the data rate based on a selected television channel, thereby reducing the level of interference at the demodulator resulting from noise.