Acoustic Processing Device Dynamic Signal Control
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Solution Overview
Problem
Current acoustic output devices, such as headphones, often consume excessive power due to unnecessary operations and inefficient processing, particularly when multiple signal processing units are used for functions like noise-cancelling and beam forming.
Innovation Solution
An acoustic processing device with a first signal processing unit generating positive signals for speakers and a second signal processing unit generating negative signals, allowing for switching between signal supply states and power-off modes to optimize power usage, controlled by a processor that determines the necessary operations based on input audio signals and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple signal processing units are used for noise-cancelling and beam forming functions, then acoustic processing capability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of signal processing units by switching between different operational states (first state with both processing units active, second state with only first processing unit active, third state with only second processing unit active, fourth state with neither active). This allows the system to adapt its power consumption and processing capability according to actual acoustic environment requirements, resolving the contradiction between maintaining high acoustic processing capability and reducing power consumption.
Solution Approach 2:
The control unit changes the operational parameters of the signal processing units by selecting different states based on acoustic environment analysis. When the acoustic environment requires advanced processing (noise-cancelling or beam forming), the system activates the appropriate processing unit; when simple playback is sufficient, the system reduces active processing units, thereby optimizing the balance between processing capability and power consumption.
2Reliability
If the second signal processing unit is always active for generating negative signals, then noise-cancelling function is maintained, but battery life decreases
Solution Approach 1:
The system dynamically switches the second signal processing unit between active and inactive states based on whether noise-cancelling functionality is currently required. The control unit monitors acoustic environment parameters and only activates the second processing unit when negative signal generation is necessary for effective noise cancellation, thereby extending battery life while maintaining noise-cancelling function when needed.
Solution Approach 2:
The control unit periodically evaluates the acoustic environment and switches the operational state of the second signal processing unit accordingly. This periodic assessment ensures that the noise-cancelling function is maintained during periods when it is beneficial while allowing the processing unit to remain inactive during periods when it is not needed, thus optimizing battery life.
3Measurement precision
If both signal processing units operate simultaneously, then processing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic state switching that activates both signal processing units simultaneously only when the acoustic environment requires high processing accuracy (such as when both noise-cancelling and beam forming are needed). In less demanding scenarios, the system activates only the necessary processing unit or neither, thereby reducing the effective operational complexity while maintaining the capability for high-accuracy processing when required.
Solution Approach 2:
The control unit changes the operational parameters by selectively enabling or disabling processing units based on the specific acoustic processing requirements. This parameter control allows the system to achieve high processing accuracy when needed by activating both units, while reducing operational complexity in simpler scenarios by activating only one unit or neither, thus resolving the contradiction between processing accuracy and device complexity.
Data Source
AI summary
An acoustic processing device includes a first signal processing unit that generates a positive signal to be supplied to a positive electrode terminal of a first speaker and a positive electrode terminal of a second speaker, by using input audio signals from a first group of microphones, and a second signal processing unit that generates a negative signal to be supplied to a negative electrode terminal of the first speaker and a negative electrode terminal of the second speaker, by using input audio signals from a second group of microphones.