Signal Processing Apparatus for Phase-Divergent Voice Enhancement
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Solution Overview
Problem
Existing techniques for enhancing input signals, such as those containing voice and noise, fail to produce high-quality output signals when the phase of the input signal significantly differs from the true voice phase, especially when the voice power is not substantially greater than the noise power.
Innovation Solution
A signal processing apparatus that detects the presence of voice in the input signal and corrects it accordingly, followed by shaping the signal to produce an enhanced output, even if the input signal's phase is largely different from the true voice phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If enhancement processing is performed only for the amplitude component of the input signal and the phase component is directly combined, then the processing complexity is reduced, but the output signal quality deteriorates when the phase of the input signal is largely different from the phase of the true voice
Solution Approach 1:
The patent segments the signal processing into distinct stages: voice detection, amplitude enhancement, and phase correction. By separating these functions, the system can apply appropriate processing to each component independently, resolving the contradiction between simplicity and quality.
Solution Approach 2:
The patent performs voice detection and amplitude enhancement before final phase correction and signal combination. This preliminary processing of the amplitude component while preserving the original phase information allows for quality improvement without excessive complexity.
2Loss of time
If the phase of the input signal is directly used without correction, then the processing time is reduced, but the output signal quality deteriorates when the voice power is not sufficiently larger than the noise power
Solution Approach 1:
The patent applies partial phase correction only when voice detection indicates that the voice power is not sufficiently larger than noise power. This selective approach improves output quality in critical cases without adding excessive processing time in all cases.
3Manufacturing precision
If voice detection and signal correction are performed, then the output signal quality is improved, but the processing complexity increases
Solution Approach 1:
The voice detection mechanism automatically identifies when signal correction is needed based on the detected voice presence and power levels. This self-service approach enables quality improvement without requiring complex external control systems to determine when processing should be applied.
Data Source
AI summary
This invention provides a signal processing apparatus capable of obtaining an output signal of sufficiently high quality if the phase of an input signal is largely different from the phase of a true voice. The signal processing apparatus includes a voice detector that receives a mixed signal including a voice and a signal other than the voice and obtains existence of the voice as a voice flag, a corrector that receives the mixed signal and the voice flag and obtains a corrected mixed signal generated by correcting the mixed signal in accordance with a state of the voice flag, and a shaper that receives the corrected mixed signal and shapes the corrected mixed signal.