Download Audio analysis by a model of the physiological auditory system In this paper, an analysis of flute attacks processed by a model of the physiological auditory system is presented. In flute performance, the musician uses consonants (/d/, /g/, /k/, /t/ and /p/) in order to create particular effects as hard and soft attacks. These effects are very important in music interpretation. We found that the model discriminates the sounds very well and better than spectral analysis as worked out by standard methods. The model responses appeared very detailed and allowed attack classification by the application of very simple pattern recognition techniques.
Download Non-harmonic sinusoidal modeling synthesis using short-time high-resolution parameter analysis This paper describes a method to perform analysis and resynthesis of non-harmonic and possibly simple polyphonic musical signals. Sinusoidal parameter extraction is performed using the highresolution matrix-pencil method. Instead of operating on the complete signal all at once, a short-time approach has been developed both to reduce the computational complexity and for the resynthesis to be capable of reproducing gradual frequency variations of partials. Partial tracking that utilizes a birth-death strategy is performed using the extracted frame based parameters. Resynthesis of signals with closely spaced beating partials are demonstrated.
Download High-level musical control paradigms for Digital Signal Processing No matter how complex DSP algorithms are and how rich sonic processes they produce, the issue of their control immediately arises when they are used by musicians, independently on their knowledge of the underlying mathematics or their degree of familiarity with the design of digital instruments. This text will analyze the problem of the control of DSP modules from a compositional standpoint. An implementation of some paradigms in a Lisp-based environment (omChroma) will also be concisely discussed.
Download Real-Time Separation Of Transient Information In Musical Audio Using Multiresolution Analysis Techniques Whilst musical transients are generally acknowledged as holding much of the perceptual information within musical tones, most research in sound analysis and synthesis tends to focus on the steady state components of signals. A method is presented which separates the noisy transient information from the slowly time varying steady state components of musical audio. Improvements of using adaptive thresholding, and multiresolution analysis methods are then illustrated. It is shown that by analyzing the resulting transient information only, current onset detection algorithms can be improved considerably, especially for those instruments with noisy attack information, such as plucked or struck strings. The idea is then applied to audio processing techniques to enhance or decrease the strength of note attack information. Finally, the transient extraction algorithm (TSS) is applied to time-scaling implementation, where the transient and noise information is analyzed so that only steady state regions are stretched, yielding considerably improved results.
Download Additive Synthesis Of Sound By Taking Advantage Of Psychoacoustics In this paper we present an original technique designed in order to speed up additive synthesis. This technique consists in taking into account psychoacoustic phenomena (thresholds of hearing and masking) in order to ignore the inaudible partials during the synthesis process, thus saving a lot of computation time. Our algorithm relies on a specific data structure called “skip list” and has proven to be very efficient in practice. As a consequence, we are now able to synthesize an impressive number of spectral sounds in real time, without overloading the processor.
Download A-Dafx: Adaptive Digital Audio Effect Digital effects are most of the time non-adaptive: they are applied with the same control values during the whole sound. Adaptive digital audio effects are controlled by features extracted from the sound itself. This means that both a time-frequency features extraction and a mapping from these features to effects parameters are needed. This way, the usual DAFx class is extended to a wider class, the adaptive DAFx one. Four A-DAFx are proposed in this paper, based on the phase vocoder technique: a selective timestretching, an adaptive granular delay, an adaptive robotization and an adaptive whisperization. They provide interesting sounds for electroacoustic and electronic music, with a great coherence between the effect and the original sound.
Download Compositional Use Of Digital Audio Effects This article tracks the composers’ desire for increased control over continuous musical variables through examples for music from the last few centuries. Examples are given on the development of notation and orchestration. A special focus is provided on electroacoustic music as a natural continuation of this development, and typical types of timbral development and structural discourse are brought forward in an attempt to explain which parameters composers of electroacoustic music are considering in their work.
Download Low-Cost Geometry-Based Acoustic Rendering In this paper we propose a new sound rendering algorithm that allows the listener to move within a dinamic acoustic environment. The main goal of this work is to implement a real-time sound rendering software for Virtal Reality applications, which runs on lowcost platforms. The resulting numeric structure is a recursive filter able to efficiently simulate the impulse response of a large room.
Download Computer Synthesis Of Bird Songs And Calls Bird songs are fascinating acoustic phenomena. In this paper, we first examine the acoustic mechanisms of sound production in birds and contrast them with their anatomy. Next, we describe the simulation of a one-mass source together with a simple transmission line model for a psittacine bird. In concluding, we discuss future areas for research.
Download A Time-Variant Reverberation Algorithm For Reverberation Enhancement Systems This paper presents a new time-variant reverberation algorithm that can be used in reverberation enhancement systems. In these systems, acoustical feedback is always present and time variance can be used to obtain more gain before instability (GBI). The presented time-variant reverberation algorithm is analyzed and results of a practical GBI test are presented. The proposed reverberation algorithm has been used successfully with an electro-acoustically enhanced rehearsal room. This particular application is briefly overviewed and other possible applications are discussed.