Adaptive Noise Cancellation with Continuous Ambient Sound Analysis
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Solution Overview
Problem
Existing noise reduction technologies face a delay in achieving noise reduction effects due to the time required for ambient sound analysis, especially when switching modes in devices like headphones.
Innovation Solution
A signal processing device with a noise cancellation processing unit, a signal processing unit that performs dynamic analysis and filtering of ambient sound, and a control unit managing multiple modes, allowing dynamic analysis to continue even in noise cancellation mode, enabling quick adaptation and effect reflection across modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic analysis of ambient sound is performed to generate noise reduction signal, then noise reduction effect is improved, but time delay before effect is obtained increases
Solution Approach 1:
The system performs preliminary dynamic analysis of ambient sound continuously even in noise cancellation mode (first mode) before switching to noise reduction mode (second mode). This preliminary action prepares the noise reduction signal in advance, so when mode switching occurs, the noise reduction effect is immediately available without waiting for analysis completion.
Solution Approach 2:
The dynamic analysis process continues uninterrupted across mode transitions. The signal processing unit maintains continuous analysis of ambient sound features, ensuring that the useful action of analyzing and preparing noise reduction signals is ongoing, eliminating gaps that would cause delays when switching modes.
2Adaptability or versatility
If mode switching is implemented for different signal processing functions, then adaptability is improved, but response time after mode switching worsens
Solution Approach 1:
The system performs preliminary preparation of noise reduction signals during noise cancellation mode operation. By continuously analyzing ambient sound and pre-processing potential noise reduction signals, the system ensures that when mode switching occurs, the transition to noise reduction function is immediate without requiring new analysis time.
3Measurement precision
If ambient sound analysis is performed for adequate time to determine stationary or nonstationary sound, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The dynamic analysis of ambient sound features continues continuously without interruption, maintaining constant monitoring and analysis capabilities. This continuous operation ensures that sufficient analysis data is always available, enabling immediate accurate sound classification when needed without sacrificing overall processing throughput.
Solution Approach 2:
The system performs preliminary and continuous analysis of ambient sound characteristics, preparing classification data in advance. This preliminary action ensures that when mode switching or noise reduction activation occurs, the analysis is already complete or near-complete, eliminating the need for additional analysis time and maintaining both precision and productivity.
Data Source
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AI summary
[Object] To shorten a time until an effect is obtained after start of an adaptive process mode on an ambient sound. [Solution] Provided is a signal processing device including: a noise cancellation processing unit configured to generate a noise cancellation signal on the basis of a collected ambient sound; a signal processing unit configured to generate an ambient sound adapted signal by performing dynamic analysis related to a feature of the ambient sound and filtering the ambient sound; and a control unit configured to control a plurality of modes related to signal processing. The plurality of modes includes a first mode in which acoustic reproduction based on the noise cancellation signal is performed and a second mode in which acoustic reproduction based on the noise cancellation signal and the ambient sound adapted signal is performed, and the signal processing unit continues the dynamic analysis even in the first mode.