Circuit Assembly for High Sound Processing
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Solution Overview
Problem
Conventional microphone signal processing solutions struggle to maintain an acceptable signal-to-noise ratio when processing sound levels above 120 dBSPL, leading to increased membrane stiffness and reduced dynamic range, which is undesirable for applications requiring higher sound processing capabilities.
Innovation Solution
A circuit assembly that includes a voltage provider to generate an internal supply voltage higher than the external supply voltage, coupled with a signal follower to process the input signal, allowing for improved signal processing without increasing the external supply voltage, thereby maintaining a low signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply voltage is increased to process high sound levels (120-140 dBSPL), then the dynamic range is improved, but the membrane stiffness increases and signal-to-noise ratio decreases
Solution Approach 1:
The system separates the supply voltage for the microphone membrane from the supply voltage for the signal processing circuitry. The first supply voltage (lower) maintains the membrane while the second supply voltage (higher, up to 5.5V) powers the signal processing, allowing independent optimization of each component
Solution Approach 2:
The patent changes the voltage parameter for signal processing from the conventional single supply to a dual-supply architecture, where the second supply voltage can be dynamically adjusted to match the sound pressure level being processed, thereby maintaining optimal signal-to-noise ratio across different operating conditions
2Adaptability or versatility
If the supply voltage is increased to process high sound levels, then the dynamic range is extended, but noise increases to an unacceptable extent
Solution Approach 1:
The power supply is segmented into two independent sources: a first supply voltage for the microphone membrane and a second supply voltage for the signal processing circuitry. This segmentation allows the second voltage to be increased for high dynamic range processing without adversely affecting the membrane operation and introducing excess noise
Solution Approach 2:
The patent introduces an intermediary voltage regulation stage where the second supply voltage is separately controlled and regulated before being applied to the signal processing circuitry. This intermediary control allows precise management of the voltage level to achieve high dynamic range while suppressing noise generation
3Productivity
If the membrane stiffness is increased to handle high sound levels, then the processing capability is improved, but the signal-to-noise ratio decreases
Solution Approach 1:
The system segments the control parameters by using separate supply voltages for the membrane and the signal processing circuitry. The first supply voltage maintains the membrane in its optimal state while the second supply voltage is optimized for processing high-level signals, thereby maintaining both processing capability and signal-to-noise ratio
Data Source
AI summary
A circuit assembly and a method for processing an input signal are disclosed. In one embodiment a circuit assembly comprises a voltage provider configured to receive a supply voltage and to provide an internal supply voltage higher than the supply voltage and a signal follower coupled to an output port of the voltage provider, the signal follower being configured to receive the internal supply voltage and the input signal, and to provide an output signal depending on the input signal.