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Directed Transitional Composition for Gaming and Adaptive Music Using Q-Learning PDF Print E-mail
Written by Administrator   
Wednesday, 09 July 2014 15:42

One challenge relating to the creation of adaptive music involves generating transitions between musical ideas. This paper proposes a solution to this problem based on a modification of the Q-Learning framework described by Reese, Yampolskiy and Elmaghraby. The proposed solution represents chords as states in a domain and generates a transition between any two major or minor chords by finding a pathway through the domain in a manner based on a Q-Learning framework.  To ensure that the transitional chords conform to the tonalities defined by the start and goal chords, only chords that contain notes that are found in combined pentatonic scales built from the start and goal chords are included within the domain.  This restriction increases the speed of pathfinding and improves the conformation of the transitions to desirable tonal spaces (in particular the keys most closely related to the start and goal chords).  This framework represents an improvement over previous music generation systems in that it supports transitions from any point in a musical cue to any point in another, and these transitions can be rendered in real time.  A general method for implementing this solution in a video game is also discussed.

Last Updated on Wednesday, 09 July 2014 15:44
Discrete Isomorphic Completeness and a Unified Isomorphic Layout Format PDF Print E-mail
Written by Administrator   
Tuesday, 06 August 2013 22:26

Published in SMC 2013

Abstract:  An isomorphic layout can be used to position pitches on a grid of hexagons. This has many beneficial musical prop- erties such as consistent fingering and spatial harmonic consistency. A Unified Isomorphic Layout (UIL) format is presented in order to create a common specification for describing hexagonal isomorphic layouts. The UIL format provides an unambiguous description of relative pitch ori- entations and is easily visualized. The notion of complete and degenerate isomorphic layouts (along with a proof) is introduced to narrow down the number of valid isomorphic layouts used for exhaustive evaluations.

Journal article accepted to MC special issue on Augmentation PDF Print E-mail
Written by Administrator   
Friday, 15 November 2013 16:18

ABSTRACT. In 2007, most of the accelerometer chips sold in the US were installed in cars. Today, accelerometers are in every phone, every computer, every video game con- troller and in fitness watches and smart bands. They have also been used in countless movement-based artworks and installations. This paper describes how the accelerome- ter moved from automotive safety to video games, why it’s installed in our laptops and phones, and how it enables the direct and immediate measurement of human motion. We continue with a discussion of the use of accelerometers to measure human motion in a wide variety of industries, from healthcare to sport, from music to augmented dance. A detailed discussion of the opportunities and limitations of the measurement of acceleration is presented, followed by an exploration into a possible future where all electronic devices know where they are how they are moving, and by extension, the movements of the people they are connected to.

To appear in the special issue on Augmentation, Release date: 11 Dec. 2013

Improved Spectral Analysis Using Waveform-Aligned Adaptive Windows PDF Print E-mail
Written by Administrator   
Friday, 06 September 2013 22:21

Published in CMMR 2013

Abstract: We propose a new pipeline for the Short-Time Fourier Transform (STFT) of harmonic signals based on adapting the analysis window size to the period of the harmonic signal. Pitch estimation is used to find $f_0$, and resampling ensures a window size as close as possible to a period which reduces spectral leakage almost to zero. The result is a highly accurate spectral representation with location and amplitude of spectral peaks represented as single frequency coefficients rather than a cluster of frequencies.

We also present a new display method based on this pipeline which greatly improves the  a spectrogram through enhanced distinction among partials. Finally, validation is performed by signal restoration on 40 clips, showing the superiority of the pipeline for true periodic signals and comparability for pseudo-periodic signals.

Last Updated on Friday, 06 December 2013 22:26
SMC 2011: Isomorphic Tessellations for Musical Keyboards PDF Print E-mail
Written by gerhard   
Wednesday, 01 June 2011 15:05


SMC conference website

SMC paper


Many traditional and new musical instruments make use of an isomorphic note layout across a uniform planar tessellation. Recently, a number of hexagonal isomorphic keyboards have become available commercially. Each such keyboard or interface uses a single specific layout for notes, with specific justifications as to why this or that layout is better. This paper is an exploration of all possible note layouts on isomorphic tessellations. We begin with an investigation and proof of isomorphism in the two regular planar tessellations (Square and hexagonal), we describe the history and current practice of isomorphic note layouts from traditional stringed instruments to commercial hex keyboards and virtual keyboards available on tablet computers, and we investigate the complete space of such layouts, evaluating the existing popular layouts and proposing a set of new layouts which are optimized for specific musical tasks

Last Updated on Sunday, 13 November 2011 22:44

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