Filtering Apparatus Using Spectrum Shifting for Signal Bandwidth Adaptation
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Solution Overview
Problem
Current communication systems require multiple filters to be designed and developed for signals with different bandwidths, leading to significant manpower and material resource consumption.
Innovation Solution
A filtering method that involves spectrum shifting to align the boundary of a valid signal band with the side frequency point of a filter, allowing a single filter to suppress unwanted signals while retaining valid signals within its passband, eliminating the need for multiple filter designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters are designed and developed for signals of different bandwidth, then each signal can be filtered with a matching filter, but manpower and material resources are consumed
Solution Approach 1:
The patent makes a single filter capable of filtering signals with different bandwidths by introducing a spectrum shifting module. The filter is designed with a fixed passband, and the spectrum shifting module shifts the frequency spectrum of input signals with different bandwidths so that their valid signal bands align with the filter's passband. This allows one filter to perform multiple filtering tasks that would otherwise require multiple dedicated filters, resolving the contradiction between filter adaptability and the number of filters needed.
2Ease of manufacture
If a filter with fixed passband is used, then the filter design is simplified, but it cannot filter signals with bandwidth larger than the passband without additional processing
Solution Approach 1:
The patent applies preliminary spectrum shifting to the input signal before it enters the filter. The spectrum shifting module pre-processes signals with different bandwidths by shifting their frequency spectra so that the valid signal bands are positioned to match the filter's fixed passband. This preliminary action enables a simple fixed-passband filter to effectively process signals of various bandwidths, resolving the contradiction between filter design simplicity and adaptability.
Data Source
AI summary
A filtering method and apparatus are provided, and the method includes: performing spectrum shifting on a first signal to obtain a second signal, where the first signal includes a first valid signal band and a first to-be-suppressed signal band, a demarcation point of the first valid signal band and the first to-be-suppressed signal band in the first signal is a first boundary point, the first boundary point corresponds to a second boundary point in the second signal, a frequency of the second boundary point is equal to a frequency of a first side frequency point of the filter, and a frequency range corresponding to the first valid signal band in the second signal falls within a frequency range corresponding to a passband of the filter (S301); and filtering the second signal by using the filter, to obtain the first valid signal band (S302).