Electronic Musical Instrument Ad-Lib Note Jump Suppression
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Solution Overview
Problem
Existing electronic musical instruments with ad-lib performance functions face issues of note jumps between phrases and during chord changes, leading to unstable musical sound production due to the limitations of conventional chord scale note tables and user interaction with the keyboard.
Innovation Solution
An electronic musical instrument with a chord scale note table composed of 12 notes starting from a chord tone, where the C note is the root, and a control unit that suppresses note jumps by selecting scales that minimize intervals between key numbers, ensuring smooth transitions between phrases and during chord changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional chord scale note table with 12 notes starting from C root note is used for phrase conversion, then the ad-lib performance function can be implemented, but note jumps occur during chord changes leading to unstable musical sound production
Solution Approach 1:
The patent changes the reference parameter of the chord scale note table from C root note to the actual root note of the detected chord. This parameter change allows the note table to adapt to different chord types and root notes, eliminating note jumps during chord changes by adding the appropriate root note value to convert basic phrases to the correct key.
Solution Approach 2:
The patent makes the chord scale note table dynamic by detecting the current chord type and root note, then selecting or adjusting the appropriate note table accordingly. This dynamic adaptation ensures that phrase conversions remain musically accurate throughout chord progressions, preventing instability in sound production.
2Device complexity
If basic phrases are converted using a fixed chord scale note table, then the conversion process is simple, but the phrases may not be heard stably due to great note jumps when root notes change
Solution Approach 1:
The patent modifies the conversion process by changing the reference parameter from a fixed C root note to a dynamic root note based on the detected chord. This allows the system to maintain simplicity in the conversion mechanism while improving stability through adaptive parameter selection.
3Ease of operation
If phrase data is read out based on keyboard depression order, then user performance flexibility is enabled, but the note production order varies leading to unstable musical output
Solution Approach 1:
The patent introduces feedback mechanisms by detecting the current chord type and root note, then using this information to adjust the phrase conversion in real-time. This feedback loop ensures that regardless of the order in which users depress keys, the musical output remains stable and harmonically correct.
Data Source
AI summary
The ROM 101 stores a chord scale note table composed of a plurality of scale by 12 notes starting from a chord tone in which C note is given as a root note and arranging a chord scale note as an inverted form of a chord in which the note is given as the lowest note. Where there is any change in chord at a beginning note of a phrase, or while phrase is played, notes are replaced to suppress note jump by using the chord scale note table. Where time from the previous key-on to the current key-on is in excess of a predetermined time, the note jump will not be suppressed.