Multi-Band Signal Noise Reduction for High-Frequency Digitizing
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Solution Overview
Problem
Digitizing systems introduce unwanted noise into digital signals, particularly in high-quality digitizing systems used for digital test and measurement, leading to inaccurate representations of analog signals and potential loss of high-frequency components.
Innovation Solution
A noise reduction system that splits input signals into multiple frequency channels, allowing independent noise reduction and amplification control in each channel, using multiplexers and filters to isolate and remove noise, and recombines the signals after scaling to minimize noise introduction during digitization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-channel digitizing system is used, then the system structure is simple, but the signal-to-noise ratio is poor and high-frequency components are lost in the noise floor
Solution Approach 1:
The patent divides the input signal into multiple frequency bands (e.g., low-frequency band and high-frequency band) using bandpass filters. Each frequency band is then processed independently through separate amplification and digitization channels. This segmentation allows optimized noise reduction for each band while maintaining overall system performance without requiring a completely complex multi-channel architecture.
Solution Approach 2:
The patent applies different amplification strategies to different frequency bands based on their specific noise characteristics. Low-frequency signals receive one level of amplification while high-frequency signals receive different amplification. This local quality approach allows each frequency band to be processed with optimal parameters for its specific requirements, improving overall measurement precision without uniform complexity throughout the system.
2Object-affected harmful factors
If noise reduction filtering is applied to the entire signal bandwidth, then overall noise is reduced, but high-frequency signal components are also attenuated or lost
Solution Approach 1:
The patent segments the signal bandwidth into multiple frequency bands using bandpass filters before amplification and digitization. By processing each frequency band separately, the system can apply noise reduction appropriate for each band without affecting other bands. This prevents the loss of high-frequency components that would occur if broad-band noise filtering were applied to the entire signal.
Solution Approach 2:
The patent extracts high-frequency signal components from the overall signal before processing through separate channels. This extraction allows high-frequency components to be preserved and processed independently, preventing them from being lost in the noise floor or attenuated by broad-band noise reduction filters applied to the complete signal spectrum.
3Measurement precision
If signal amplification is increased to improve the signal-to-noise ratio, then weak signals are enhanced, but the system introduces more noise from amplifiers and digitizers
Solution Approach 1:
The patent segments the signal into multiple frequency bands and processes each band through separate amplification channels. This allows optimization of amplification levels for each frequency band independently, applying higher amplification where needed while managing amplifier noise on a per-band basis rather than across the entire signal spectrum.
Solution Approach 2:
The patent applies different amplification strategies to different frequency bands based on their specific signal-to-noise requirements. Each frequency band receives amplification tailored to its characteristics, improving overall measurement precision while managing the noise introduced by amplifiers in a localized manner for each band rather than uniformly across all signals.
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AI summary
Systems and methods directed towards reducing noise introduced into a signal when processing the signal are discussed herein. In embodiments a signal may initially be split by a multiplexer (141) into two or more frequency bands. Each of the frequency bands can then be forwarded through an assigned channel. One or more channels may include an amplifier (121, 131) to independently boost the signal band assigned to that channel prior to a noise source (123, 133) within the assigned channel. This results in boosting the signal band relative to noise introduced by the noise source. In some embodiments, a filter (127, 137) may also be implemented in one or more of the channels to remove noise from the channel that is outside the bandwidth of the signal band assigned to that channel. Additional embodiments may be described and/or claimed herein.