Sound Pickup Apparatus Dual Sensitivity Beam Clipping Prevention
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Solution Overview
Problem
Existing sound pickup apparatuses face challenges in accurately detecting sounds at startup due to microphone sensitivity issues, leading to potential clipping when large sounds are input, and existing methods either fail to detect sounds or cause clipping.
Innovation Solution
A sound pickup apparatus utilizing a microphone array with distributed signal processing and dual sensitivity sound pickup beams, where a high-sensitivity beam is used for detection and switched to a low-sensitivity beam when clipping occurs, ensuring accurate startup detection and preventing clipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity of the microphone is increased to detect a sound at start-up, then the sound detection capability is improved, but clipping occurs when a large sound is input
Solution Approach 1:
The patent dynamically switches between high-sensitivity and low-sensitivity sound pickup beams based on real-time sound level detection. When a large sound is detected, the system switches from the high-sensitivity beam to the low-sensitivity beam, preventing clipping while maintaining accurate sound detection capability.
Solution Approach 2:
The patent changes the sensitivity parameter of the sound pickup beam by selecting between different pre-stored beams with different sensitivity characteristics. This allows the system to adapt to varying sound levels and prevent clipping without sacrificing detection capability.
2Measurement precision
If the sensitivity of the microphone is increased, then sound detection at start-up is improved, but silence is erroneously perceived as sound
Solution Approach 1:
The system dynamically adjusts sensitivity by switching between high-sensitivity and low-sensitivity beams based on sound level conditions. During silence or low-level conditions, the low-sensitivity beam prevents false detections, while during actual sound events, the high-sensitivity beam ensures accurate detection.
Solution Approach 2:
The sound level detection unit provides feedback about the current sound level to the control unit, which then selects the appropriate sensitivity level. This feedback mechanism ensures that the sensitivity setting matches the actual acoustic conditions, preventing both missed detections and false alarms.
3Productivity
If silence suppression is performed to decrease transmission data, then transmission efficiency is improved, but sound detection at start-up becomes difficult
Solution Approach 1:
The patent performs preliminary detection using the high-sensitivity sound pickup beam before activation of full transmission. This preliminary action allows the system to detect sound start-up events even during silence suppression, ensuring that sound detection capability is maintained while transmission efficiency is improved.
Solution Approach 2:
The high-sensitivity sound pickup beam acts as an intermediary detection mechanism that operates independently of the main transmission path. It enables sound detection at start-up without requiring full transmission activation, thus maintaining detection capability while preserving transmission efficiency.
Data Source
AI summary
An A/D converter sets a sound pickup signal to low sensitivity and inputs the signal to a sound pickup beam generation unit. The A/D converter sets a sound pickup signal to high sensitivity and inputs the signal to the sound pickup beam generation unit. A sound detector determines from the sound pickup beam whether or not sound is present and whether or not clipping has arisen. A control unit inputs a determination result from the sound detector, thereby setting an encoder such that a low-level sound pickup beam signal is output to the outside when a high-level sound pickup beam signal is clipped.