Resonance Sound Adding Apparatus for Keyboard Instruments
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Solution Overview
Problem
Existing resonance sound generating technologies for keyboard instruments face limitations in controlling resonance intensity across different pitches, leading to harsh resonance sounds due to the need for numerous resonators and large data storage requirements.
Innovation Solution
A resonance sound adding apparatus comprising a resonator group with delay circuits, low-pass filters, and a storage device that uses coefficient tables to adjust delay times and filter control signals, ensuring resonant frequencies do not match key pitches, thereby controlling resonance intensity and preventing harsh sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If as many resonators as the number of keys or strings are provided to control resonance intensity for each pitch, then resonance control precision is improved, but device complexity and data storage requirements increase
Solution Approach 1:
A single resonator is designed to serve multiple functions by generating resonance data for multiple different resonant frequencies simultaneously. The resonator processes sound signal data corresponding to different pitches and generates appropriate resonance sounds for each pitch without requiring separate dedicated resonators for each pitch, thus reducing overall system complexity while maintaining comprehensive resonance control capability
Solution Approach 2:
The resonator dynamically adjusts its operating parameters including delay time and cutoff frequency based on the pitch of the sound signal data being processed. By changing these parameters adaptively, the single resonator can generate resonance data with different resonant frequencies corresponding to different pitches, eliminating the need for multiple fixed-frequency resonators
2Object-generated harmful factors
If resonance data is generated using standard delay circuits, then resonance sound is added to the sound signal, but harsh resonance occurs when resonant frequency matches key pitch
Solution Approach 1:
The system proactively prevents harsh resonance by deliberately designing the resonator to generate resonance data at resonant frequencies that do not match the pitch of any key. This preliminary design choice avoids the harmful effect of resonance matching before it can occur, ensuring that the added resonance sound is always musically appropriate and free from harshness
Solution Approach 2:
The resonator dynamically adjusts its resonant frequency parameter based on the input sound signal data. By changing the resonant frequency to correspond to the pitch of the processed sound signal, the system maintains appropriate resonance characteristics and avoids generating harsh resonance that would occur with fixed or mismatched resonant frequencies
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 solution allows for appropriate resonance sound addition across various pitches without generating harsh resonance, providing a sense of spreading resonance similar to an actual grand piano, while reducing data storage needs and maintaining resonance quality.
Implementation Method 1
a delay circuit configured to delay an input based on delay time data indicating a delay time
Implementation Method 2
a first low-pass filter configured to receive an output from the second adder and to perform low-pass filtering by a cutoff frequency depending on a filter control signal
Implementation Method 3
the resonators generating resonance sound data of given resonant frequencies based on sound signal data corresponding to a pitch of a key which is struck
Data Source
AI summary
Resonators generate resonance sound data of given resonant frequencies based on sound signal data corresponding to a pitch of a key. Each resonator includes a delay circuit which delays an input based on delay time data, a second adder which adds an output from the delay circuit to input sound signal data, and a low-pass filter which performs filtering depending on a filter control signal on the output from the second adder. An output from the low-pass filter is input to the delay circuit, and a first adder adds outputs from the resonators. A storage device stores a coefficient table containing items of delay time data to be provided to the resonators, and the items of the delay time data do not match with frequencies corresponding to pitches of keys.