Audio Pitch Shifting for Dynamic Just Intonation
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Solution Overview
Problem
Existing audio signal processing technologies struggle to achieve variable tuning for musical chords across different instruments and keys, as they often rely on assumptions about uniform pitch ratios, which fail when input data does not conform to standard tunings like equal tempered tuning.
Innovation Solution
A system that processes audio signals from multiple instruments to determine and adjust pitch relationships based on the chord being played, using a reference signal and applying pitch shifts to achieve desired ratios, such as those in just intonation, allowing for dynamic tuning that adapts throughout a musical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If equal tempered tuning is used to standardize pitch ratios across the scale, then ease of operation and adaptability improve, but manufacturing precision and sound quality of chords deteriorate
Solution Approach 1:
The system dynamically adjusts pitch relationships based on the detected chord type and musical context. Instead of using fixed equal tempered ratios, the system calculates and applies just intonation ratios specific to each chord being played, allowing optimal tuning for each musical situation while maintaining adaptability across different keys and chords.
Solution Approach 2:
The system changes the pitch ratio parameters from fixed equal tempered values to variable just intonation values based on chord analysis. By detecting the chord type and calculating appropriate just intonation ratios, the system transforms the pitch relationships to achieve pure-sounding chords while preserving the ability to adapt to different musical contexts.
2Manufacturing precision
If harmonic tuning is used to achieve pure-sounding chords, then sound quality improves, but adaptability to different keys deteriorates
Solution Approach 1:
The system dynamically determines the appropriate just intonation ratios based on the detected chord type and musical context. By continuously analyzing the input signal and adjusting pitch relationships in real-time, the system maintains pure-sounding chords across different keys and chord progressions, overcoming the limitation of fixed harmonic tuning.
Solution Approach 2:
The system automatically detects chord types from the input signal and self-adjusts the pitch relationships without requiring manual intervention. The chord recognition and pitch adjustment processes work together to maintain optimal tuning for each chord, enabling the system to adapt to different keys and maintain high sound quality autonomously.
3Manufacturing precision
If variable tuning is implemented to adjust pitch based on chord type, then chord sound quality improves, but device complexity increases
Solution Approach 1:
The system segments the complex task of pitch adjustment into distinct functional modules: chord detection, chord type classification, just intonation ratio calculation, and pitch relationship adjustment. This modular approach manages complexity by breaking down the overall process into manageable, specialized components that can be processed sequentially.
Solution Approach 2:
The system uses feedback from chord recognition results to dynamically adjust pitch relationships. By continuously monitoring the detected chord type and adjusting pitch ratios accordingly, the system creates a closed-loop control mechanism that maintains accurate pitch relationships while managing complexity through iterative refinement.
4Adaptability or versatility
If pitch adjustments are made in real-time during performance, then adaptability and sound quality improve, but loss of time for processing increases
Solution Approach 1:
The system pre-calculates and stores just intonation ratios for common chord types before processing the musical performance. By having these ratios prepared in advance, the system can quickly retrieve and apply the appropriate ratios when chords are detected, reducing real-time processing time while maintaining adaptability to different chord types.
Data Source
AI summary
A method and apparatus for shifting pitches of audio signals to achieve desired pitch relationships between the audio signals. Two or more audio signals are received. The audio signals may be in either a digital or analog format. One of the input audio signals is selected to be a reference signal. For each of the other audio signals, the pitch of the other audio signal is compared with the pitch of the reference signal to determine a relative pitch relationship. For each of the other signals, an adjustment is determined to bring the relationship to a desired pitch relationship. Based on the adjustment, the pitch of at least one of the audio signals is adjusted to achieve the desired pitch relationship between the audio signals.