Spread-Spectrum Decoding Frequency Adjustment for Display Noise Reduction
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Solution Overview
Problem
Spread-spectrum technology, while effective in reducing EMI radiation energy, poses challenges in receiving high-speed transmitted signals accurately, often resulting in display noises due to decoding errors in electronic devices like TFT-LCDs.
Innovation Solution
A method that acquires a fixed input frequency for spread-spectrum processing, calculates the number of cycles within a predetermined time range, adjusts the decoding frequency based on a ratio comparison, and updates the frequency to ensure accurate demodulation, thereby reducing display noises and improving signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spread-spectrum technology is used to reduce EMI radiation energy, then EMI radiation energy is reduced, but signal decoding accuracy deteriorates causing display noises
Solution Approach 1:
The patent applies preliminary action by pre-calculating the number of cycles N within a predetermined time range before demodulation, and pre-setting the frequency adjustment step based on the spread-spectrum modulation cycle. This preparation ensures that when frequency adjustment is needed, the system can quickly and accurately tune to the correct frequency without compromising decoding accuracy, thus resolving the contradiction between EMI reduction and signal reception accuracy.
Solution Approach 2:
The patent implements dynamics by making the decoding frequency adjustable and adaptive. Instead of using a fixed decoding frequency, the system dynamically adjusts the decoding frequency based on the actual received signal characteristics. The frequency adjustment mechanism allows the system to adapt to frequency variations caused by spread-spectrum modulation, maintaining accurate signal reception while preserving the EMI reduction benefits.
2Object-affected harmful factors
If spread-spectrum demodulation is performed on high-speed transmitted signals, then EMI radiation energy is reduced, but signal reception difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the number of cycles N within a predetermined time range before demodulation, and pre-setting the frequency adjustment step based on the spread-spectrum modulation cycle. This preparation ensures that when frequency adjustment is needed, the system can quickly and accurately tune to the correct frequency without compromising decoding accuracy, thus resolving the contradiction between EMI reduction and signal reception accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring the received signal characteristics and adjusting the decoding frequency accordingly. The system uses the ratio of actual cycles to expected cycles as feedback to determine whether frequency adjustment is needed, and adjusts the decoding frequency in steps until the signal is correctly received. This feedback mechanism simplifies signal reception by automatically compensating for frequency variations.
3Measurement precision
If decoding frequency is adjusted to improve signal reception, then signal reception accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the number of cycles N within a predetermined time range before demodulation, and pre-setting the frequency adjustment step based on the spread-spectrum modulation cycle. This preparation ensures that when frequency adjustment is needed, the system can quickly and accurately tune to the correct frequency without compromising decoding accuracy, thus resolving the contradiction between EMI reduction and signal reception accuracy.
Solution Approach 2:
The patent implements parameter changes by adjusting the decoding frequency parameter in controlled steps. Instead of implementing a complex frequency synthesis system, the patent simply varies the decoding frequency parameter based on the calculated cycle ratio. This approach improves signal reception accuracy while minimizing system complexity by using simple parameter adjustment rather than complex hardware changes.
Data Source
AI summary
Disclosed are a spread-spectrum decoding method for a transmitted signal and a display apparatus. The method comprises: acquiring a fixed input frequency of an input signal, and taking the fixed input frequency as a decoding frequency; performing a calculation according to the fixed input frequency to obtain a cycle number N of the input signal within a pre-set time range; determining whether, during the pre-set time range, the ratio of the number of cycles corresponding to the input frequency after the spread-spectrum processing, which is greater than or less than the decoding frequency, to the cycle number N is greater than or equal to a pre-set percentage; if so, adding a one stage pre-set adjustment frequency value to the decoding frequency or subtracting same from the decoding frequency so as to obtain a new decoding frequency; and taking the new decoding frequency as an updated decoding frequency.