Semiconductor Receiver Narrow Band Noise Suppression
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Solution Overview
Problem
Existing power line communication technologies struggle to effectively eliminate narrow band noise without also removing adjacent frequency signal components, leading to frame synchronization errors.
Innovation Solution
A semiconductor device with a narrow band noise detector and reference signal generator that performs Fourier transforms and amplitude adjustments to isolate and suppress narrow band noise frequencies, thereby minimizing interference with adjacent signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If notch filtering is used to eliminate narrow band noise, then noise suppression is improved, but adjacent frequency signal components are also removed
Solution Approach 1:
The patent applies local quality by creating a reference signal with selectively adjusted amplitude values for specific frequency components. The reference signal generator sets amplitude values corresponding to narrow band noise frequencies to zero or reduced levels, while preserving amplitude values for adjacent frequency components. This localized modification in the frequency domain allows selective noise suppression without affecting neighboring signal components.
Solution Approach 2:
The patent utilizes parameter changes by modifying the amplitude values of frequency components in the reference signal. The reference signal generator changes the amplitude parameter for specific frequency components corresponding to narrow band noise, setting them to zero or reduced levels. This parameter adjustment in the frequency domain enables targeted noise elimination while maintaining other signal components intact.
2Object-affected harmful factors
If subcarrier components of narrow band noise are not utilized, then noise interference is reduced, but adjacent frequency signals are also affected
Solution Approach 1:
The patent applies local quality by making differentiated treatment of frequency components in the reference signal. Instead of uniformly excluding all subcarrier components, the system selectively adjusts amplitude values only for frequency components corresponding to narrow band noise, while maintaining other frequency components at normal levels. This localized approach preserves frame synchronization reliability by keeping useful signal components intact.
Solution Approach 2:
The patent employs feedback through the correlation calculation process. The receiver calculates correlation between the input signal and the reference signal with adjusted amplitude values. This correlation calculation provides feedback information that enables accurate frame synchronization detection even in the presence of narrow band noise, as the reference signal's selectively modified frequency components reduce noise correlation while maintaining signal correlation.
Data Source
AI summary
A semiconductor device contains a narrow band noise detector section to detect narrow band noise in an input signal that is input by way of a power line. The semiconductor device further includes a reference signal generator section to generate a second reference signal whose amplitude value which corresponds to the narrow band noise frequency of a pre-established first reference signal is reduced, and a correlation calculation section to calculate the correlation value between the input signal and the second reference signal utilized in the frame synchronization processing of the input signal.