Signal Processing Apparatus for Independent Gain Adjustment
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Solution Overview
Problem
Existing signal amplification and attenuation techniques cannot separately adjust desired and other signals in mixed signals at different ratios, limiting their application in recording natural sounds or suppressing environmental sounds.
Innovation Solution
A signal processing apparatus and method that estimates both signals in a mixed signal and applies different gains to each, allowing for independent amplification or attenuation of the desired signal and the other signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If background noise is suppressed and gain is applied to the signal, then speech can be listened to without distortion with appropriate volume, but environmental sounds cannot be held or slightly suppressed as needed
Solution Approach 1:
The patent segments the mixed signal into speech signal and environmental sound signal components. By separating these components, the system can apply different gain adjustments to each - amplifying speech while maintaining control over environmental sounds, thus resolving the contradiction between speech clarity and environmental sound adaptability
Solution Approach 2:
The patent applies local quality by differentiating the processing applied to different signal components. The speech signal receives one gain adjustment while environmental sounds receive different processing, allowing tailored control for each component's specific requirements
2Device complexity
If a single gain is applied to the mixed signal, then processing is simple, but the desired signal and other signals cannot be amplified or attenuated at different ratios
Solution Approach 1:
The patent divides the signal processing into separate stages for different signal components. By segmenting the processing path for desired signals and other signals, the system achieves independent gain control for each component while maintaining manageable processing complexity through modular architecture
Solution Approach 2:
The patent implements dynamic gain control where the gain values can be adjusted independently for different signal components based on real-time signal characteristics. This dynamic approach enables flexible ratio control between desired and other signals
Data Source
AI summary
There is provided a signal processing apparatus for amplifying or attenuating, with respect to a signal in which a desired signal and another signal are mixed, the desired signal and the other signal at different ratios. The signal processing apparatus includes a separator that obtains an estimated first signal and an estimated second signal by receiving a mixed signal in which a first signal (for example, speech) and a second signal (for example, noise) are mixed and estimating the first signal and the second signal. Furthermore, the signal processing apparatus includes a gain adjuster that obtains a gain-adjusted mixed signal by receiving the estimated first signal and the estimated second signal.