ShrutiSense: Microtonal Modeling and Correction in Indian Classical Music

TL;DR

ShrutiSense is a novel symbolic pitch processing system that accurately models and corrects microtonal pitch sequences in Indian classical music, incorporating raga-specific rules and microtonal nuances.

Contribution

It introduces a comprehensive system combining a Shruti-aware FST and a grammar-constrained GC-SHMM for pitch correction and melodic completion in Indian classical music.

Findings

Achieves 91.3% shruti classification accuracy in correction tasks

Maintains high accuracy under pitch noise up to +/-50 cents

Performs consistently across different ragas

Abstract

Indian classical music relies on a sophisticated microtonal system of 22 shrutis (pitch intervals), which provides expressive nuance beyond the 12-tone equal temperament system. Existing symbolic music processing tools fail to account for these microtonal distinctions and culturally specific raga grammars that govern melodic movement. We present ShrutiSense, a comprehensive symbolic pitch processing system designed for Indian classical music, addressing two critical tasks: (1) correcting westernized or corrupted pitch sequences, and (2) completing melodic sequences with missing values. Our approach employs complementary models for different tasks: a Shruti-aware finite-state transducer (FST) that performs contextual corrections within the 22-shruti framework and a grammar-constrained Shruti hidden Markov model (GC-SHMM) that incorporates raga-specific transition rules for contextual completions. Comprehensive evaluation on simulated data across five ragas demonstrates that ShrutiSense (FST model) achieves 91.3% shruti classification accuracy for correction tasks, with example sequences showing 86.7-90.0% accuracy at corruption levels of 0.2 to 0.4. The system exhibits robust performance under pitch noise up to +/-50 cents, maintaining consistent accuracy across ragas (90.7-91.8%), thus preserving the cultural authenticity of Indian classical music expression.