Musical Tone Signal Generation Using Mixed Decay Waveforms
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Solution Overview
Problem
Conventional musical tone signal generating apparatuses fail to generate realistic musical tone signals based on variations in strength, as they rely on changing the read-out starting position of waveform data, leading to the need for multiple waveform data sets and increased memory capacity, especially for instruments with multiple tone pitches.
Innovation Solution
A musical tone signal generating apparatus that stores fast and slow decay waveform data, using separate read-out sections to select and mix waveform data based on strength information, allowing for accurate representation of musical tone waveforms varying with strength without requiring large memory capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple waveform data sets representing different strength levels are stored to generate realistic musical tone signals, then the realism of musical tone generation is improved, but the memory capacity required increases significantly
Solution Approach 1:
The patent divides the waveform data into multiple segments corresponding to different strength levels. Instead of storing complete waveforms for each strength, only specific segments (portions) of waveforms at different strength levels are stored in the memory. The system selectively reads and combines these segments to generate complete musical tone signals, thereby reducing memory requirements while maintaining generation quality.
Solution Approach 2:
The patent merges waveform segments from different strength levels during the tone generation process. By combining selected segments from multiple pre-stored waveform data sets, the system reconstructs complete musical tone signals that accurately represent the desired strength level, achieving realistic tone generation without storing all possible complete waveforms.
2Quantity of substance
If waveform data is segmented and selectively read out based on strength information, then the amount of stored waveform data is reduced, but the complexity of the read-out and mixing process increases
Solution Approach 1:
The patent implements dynamic selection and mixing of waveform segments based on the desired strength level. The read-out process dynamically determines which segments to retrieve from memory and how to combine them, adapting the generation process to the specific strength requirements of each musical tone signal rather than using a fixed, static approach.
Solution Approach 2:
The patent changes the parameters of the waveform data processing by varying the selection and combination of segments based on strength information. By adjusting which segments are read out and how they are mixed, the system generates different strength levels from the same set of pre-stored waveform segments, reducing data storage requirements while maintaining flexibility.
Data Source
AI summary
A waveform memory WM stores fast decay waveform data representative of fast decay waveforms of different levels of strength and slow decay waveform data representative of a slow decay waveform of a strong strength. A CPU 21 controls a tone generator 15 to select at least a waveform data according to the level of strength of a touch from among the plurality of fast decay waveform data to read out the selected waveform data from the top address of the waveform data. In addition, the CPU 21 also controls the tone generator 15 to read out the slow decay waveform data, starting at an address placed further away from the top of the slow decay waveform data as the level of strength of the touch decreases. The read fast decay waveform data and the read slow decay waveform data is mixed together to be output.