Selective Sound Storage Device Frequency Detection
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Solution Overview
Problem
Sound storage devices face challenges in determining the start of automatic recording, especially when dealing with low-level signals from instruments playing delicate expressions, as existing methods rely solely on signal level, leading to potential missed recordings.
Innovation Solution
A controller system that determines the frequency of the sound signal and initiates recording only when the frequency falls within a predetermined range, ensuring accurate detection of musical performance and preventing noise pickup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic recording starts based on signal level threshold, then high-level signals are detected accurately, but low-level signals from delicate expressions are missed
Solution Approach 1:
The patent changes the detection parameter from signal level to frequency. By analyzing the frequency characteristics of the sound signal, the system can reliably detect the start of musical performances regardless of signal level, solving the problem of missing low-level delicate expressions while maintaining accurate detection
2Measurement precision
If frequency-based detection is used, then accurate detection of musical performance is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or hardware-based frequency analysis systems with a software-based frequency detection algorithm implemented in the controller. This substitution achieves accurate frequency-based detection while minimizing additional hardware complexity, as the controller already exists in the sound storage device
Data Source
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AI summary
A computer-readable medium, controller and a method of automatically recording a sound signal is provided. A sound signal is received by the controller from a sound generating device. A frequency of the received sound signal is determined by the controller. When the determined frequency is within a predetermined frequency range, the controller starts recording the received sound signal.