Signal Processing Apparatus Phase Control for Noise Suppression
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Solution Overview
Problem
Shifting phase spectra at all frequencies randomly in existing noise suppression techniques leads to defects in calculation amount and signal quality.
Innovation Solution
A signal processing apparatus and method that transforms mixed signals into phase and amplitude components, generates a change amount for the phase component at specific frequencies with weaker cross-correlation, and controls the phase component to enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phase spectra are shifted at all frequencies randomly, then noise suppression is improved, but calculation amount increases and signal quality deteriorates
Solution Approach 1:
The patent applies different processing strategies to different frequency regions. Specifically, it identifies frequency regions where phase shifting is effective for noise suppression and applies phase shifting only to those regions, while leaving other regions unchanged. This localized approach maintains noise suppression benefits while reducing overall calculation amount.
Solution Approach 2:
The patent segments the frequency spectrum into multiple regions and processes each region differently. By dividing the frequency domain and selectively applying phase shifting to specific segments rather than the entire spectrum, the system achieves noise suppression with reduced computational burden.
2Object-affected harmful factors
If phase spectra are shifted at all frequencies randomly, then noise suppression is improved, but signal quality deteriorates
Solution Approach 1:
The patent applies phase shifting selectively to specific frequency regions rather than uniformly across all frequencies. This localized application ensures that phase shifting benefits are concentrated where they are most effective for noise suppression, while preserving signal quality in other frequency regions that are not subjected to random phase shifting.
Solution Approach 2:
By segmenting the frequency spectrum and applying different processing approaches to different segments, the patent maintains signal quality while achieving noise suppression. The segmentation allows the system to preserve important signal components in certain frequency regions while suppressing noise in others.
Data Source
AI summary
To obtain a high-quality enhanced signal, there is provided an apparatus including a transformer that transforms a mixed signal, in which a first signal and a second signal coexist, into a phase component for each frequency and one of an amplitude component and a power component for each frequency, an amplitude analyzer that derives a predetermined frequency at which one of the amplitude component and the power component matches a predetermined condition, a change amount generator that generates a change amount of the phase component at the predetermined frequency by using a series of data with a cross-correlation weaker than that of the phase components, a phase controller that controls the phase component at the predetermined frequency by using the change amount provided from the change amount generator, and an inverse transformer that generates an enhanced signal by using the phase component having undergone control processing by the phase controller.