Drum Tuning via Fundamental Tone Reference and Overtone Filtering
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Solution Overview
Problem
Existing drum tuning methods rely heavily on accurate detection of the first overtone, which can be unreliable, leading to difficulty in tuning drums effectively.
Innovation Solution
A method that involves recording a sound fragment with a vibration sensor, converting it to the frequency domain, detecting the fundamental tone, calculating the overtone frequency range, setting a filter to detect the overtone within this range, and indicating via a user interface whether the detected overtone frequency is higher or lower than a target frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the method relies on accurate detection of the first overtone at each strike, then tuning guidance can be provided, but the reliability of detection becomes problematic leading to tuning difficulty
Solution Approach 1:
The patent applies preliminary action by detecting the fundamental tone before detecting the overtone. The fundamental tone is detected first to establish a reference frequency, then the overtone detection is performed within a predetermined frequency range calculated based on this fundamental tone. This preliminary detection of the fundamental tone improves the reliability of subsequent overtone detection by providing a reference point and defining a search range.
Solution Approach 2:
The patent uses the fundamental tone as an intermediary element between the strike and the overtone detection. Instead of directly detecting the overtone which may be unreliable, the system first detects the fundamental tone and uses it to calculate a predetermined frequency range, then searches for the overtone within this range. The fundamental tone acts as a mediator that facilitates more reliable overtone detection.
2Reliability
If the method uses a predetermined frequency range for overtone detection based on fundamental tone, then detection reliability improves, but the device complexity increases due to additional processing steps
Solution Approach 1:
The patent reduces complexity by performing preliminary calculation of the predetermined frequency range based on the fundamental tone. Instead of using complex algorithms to directly detect overtones, the system pre-calculates the expected frequency range and simply searches within this range, significantly reducing computational complexity while maintaining reliability.
Solution Approach 2:
The patent changes the detection parameter from direct overtone frequency detection to searching within a predetermined frequency range calculated from the fundamental tone. This parameter change simplifies the detection process by converting an ambiguous detection problem into a constrained search problem within known boundaries.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the susceptibility to errors in drum tuning by focusing on the fundamental tone and calculating overtone frequencies, allowing for accurate and efficient tuning of drums.
Implementation Method 1
recording a first sound fragment of the strike by means of a vibration sensor
Data Source
AI summary
A method for assisting a user in tuning a drum comprising the steps of: considering a strike on the drum whereby the strike is detected in a sensor signal in at least one of following domains: a time domain, a frequency domain, a complex domain; recording a first sound fragment of the strike; converting the first sound fragment from the time domain to the frequency domain; analyzing the first sound fragment in order to detect a fundamental tone with fundamental tone frequency of the drum; calculating an overtone frequency or overtone frequency range of a first overtone of the drum by means of a predetermined algorithm related to the fundamental tone frequency; setting a filter with a pass frequency band covering the calculated overtone frequency or overtone frequency range; and indicating, via a user interface, at each further strike when the frequency of the first overtone detected in the pass frequency band is higher or lower than a target overtone frequency.