Signal Level Decision Device for EMI Spectrum Confinement
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Solution Overview
Problem
Existing signal level decision devices for electronic products, such as automobile network communication devices, face challenges in reducing signal frequency spectrum confinement to comply with strict electromagnetic interference (EMI) regulations, which results in signal transmission distance and throughput losses.
Innovation Solution
A signal level decision device and method that determines the level of source signals by calculating transition parameters between normal and extension levels, allowing for the reduction of high frequency components and compliance with EMI regulations by selecting the appropriate level based on the smallest transition parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low pass filter is used to confine the frequency spectrum to a low frequency band, then electromagnetic interference compliance is improved, but signal transmission distance and throughput are reduced
Solution Approach 1:
The patent changes the parameter of signal level transitions by introducing extension levels beyond the normal signal levels. By allowing transitions to extension levels that have smaller level differences with adjacent levels, the signal's frequency spectrum is naturally confined without requiring a low pass filter, thus maintaining transmission performance while achieving EMI compliance.
2Object-affected harmful factors
If a low pass filter is used to confine the frequency spectrum to a low frequency band, then electromagnetic interference compliance is improved, but signal transmission distance is reduced
Solution Approach 1:
The patent modifies the signal level parameters by adding extension levels that create smaller transition steps. This parameter change reduces the high-frequency content of the signal inherently, allowing the signal to comply with EMI regulations while maintaining its transmission distance capability without the need for frequency-confining filters that would attenuate the signal.
3Object-affected harmful factors
If the level transition quantity of a signal is reduced, then high frequency components are minimized and EMI compliance is achieved, but signal transmission performance may be affected
Solution Approach 1:
The patent segments the signal level range into normal levels and extension levels. By introducing extension levels that are equivalent to normal levels but positioned to create smaller transitions, the signal waveform is segmented into smaller steps. This segmentation reduces high-frequency components while preserving the information content and transmission throughput.
Solution Approach 2:
The extension levels act as intermediary levels between normal signal levels. When a transition would normally occur between two normal levels with a large difference, the signal instead transitions through one or more extension levels that bridge the gap with smaller steps, thereby reducing high-frequency content while maintaining the overall signal integrity and throughput.
Data Source
AI summary
The present invention discloses a signal level decision device to determine the level of a source signal. Said source signal comprises a plurality of source messages along a time axis; each source message corresponds to one of a plurality of normal levels; and each normal level is equivalent to at least one of a plurality of extension levels. The signal decision device comprises: a storage circuit to store the level information of the normal level(s) and the equivalent extension level(s) thereof in connection with some or all of the source messages; a transition parameter calculation circuit to calculate a plurality of transition parameters of the normal level and its equivalent extension level(s) in connection with each of the source messages according to the level information; and a decision circuit to determine the level of each of the source messages according to the plurality of transition parameters.