Download Using XML for Score Representation XML is a subset of SGML (ISO 8879), the international standard metalanguage for text markup systems. It has been widely used in data representation and interchange formats. This research proposes to investigate the use of XML for musical score representation.
Download New Query-By-Humming Music Retrieval System Conception And Evaluation Based On A Query Nature Study In this article, we propose a new Query-by-humming Music Retrieval System, focusing on the nature of hummed queries, and more precisely, on their non-tempered characteristics. We show that avoiding pitch query quantization gives better retrieval results. The study of frequential imprecision of hummed melodies also allows us to present a new and easy way of stimulating systems for their quality evaluation.
Download Directivity Synthesis With A 3D Array Of Loudspeakers Application For Stage Performanc The control of directivity represents a new stake in the reproduction of sound sources by an electroacoustic device. This paper first reminds the principle of a general method for reproducing the acoustical field radiated by a source. The present study, is devoted to the bandwidth improvement and to the optimization of the directivity control. It rests on the preliminary constitution of a set of basic directivities from which it is possible to tune the cardioicity and the threedimensional orientation of the synthesized directivity pattern. For the simulation of musical instruments, it is important to maintain independent control on the spatial and spectral characteristics. For that, an analysis/synthesis method of the power spectrum is used to provide the automatic design of a correction filter to applied on near field recording before feeding the source. Results are discussed considering room acoustics criteria and examples of musical instruments.
Download Cue Point Processing: An Introduction Modern digital sound formats such as aiff, mpeg1/2/4/7, wav and ra support the use of cue points. A cue point may also be referred to as a seek point or a key frame. These mechanisms store meta data about the sound files. In this paper, we identity and describe how these formats are encoded, and process meta data information with a focus on cue points. Finally, we conclude with the direction of our future research for improving multimedia browsing mechanisms and additional applications by leveraging the use of cue points within those applications. Keywords: sound file formats, cue points, sound file, audio files, seek point, key frame, audio indexing
Download Sound Processing With The Sndobj Library: An Overview This paper presents an overview of the sound processing applications of the Sound Object (SndObj) Library version 2.0. The SndObj library is an object-oriented sound synthesis and processing programming library. It is designed for the development of music applications, as well as research and implementation of DSP algorithms. The paper includes a brief but comprehensive description of the library class trees. It also presents the new features and changes introduced in the latest version of the library. A discussion of sound processing and synthesis programs, including some code examples, completes this article.
Download Gestural Strategies for Specific Filtering Processes The gestural control of filters implies the definition of these filters and the way to activate them with gesture. We give here the example of several real “virtual instruments” which rely on this gestural control. This way we show that music making is different from algorithm producing and that a good gestural control may substitute to, or at least complement, a complex scheme using digital audio effects in real time implementations [1].
Download Digital Audio Effects in the Wavelet Domain Audio signals are often stored or transmitted in a compressed representation, which can pose a problem if there is a requirement to perform signal processing; it is likely it will be necessary to convert the signal back to a time domain representation, process, and then re-transform. This is timeconsuming and computationally intensive; it is potentially more efficient to apply signal processing while the signal remains in the transform domain. We have implemented a scheme whereby linear processing of the traditional type often instinctively understood by those working in the audio field may be applied to signals stored in a wavelet domain representation. Results are presented which demonstrate that the method produces the same output – to within the limits of machine precision – as timedomain processing, for less computational effort than would be required for the full explicit process through the time domain and back again. The potential benefits for linear effects processing (for example, EQ and sample-level delays and echoes) and also for non-linear processing such as dynamics processing, will be introduced and discussed.
Download Doppler Simulation and the Leslie An efficient algorithm for simulating the Doppler effect using interpolating and de-interpolating delay lines is described. The Doppler simulator is used to simulate a rotating horn to achieve the Leslie effect. Measurements of a horn from a real Leslie are used to calibrate angle-dependent digital filters which simulate the changing, angle-dependent, frequency response of the rotating horn.
Download Implementation Strategies for Adaptive Digital Audio Effects Adaptive digital audio effects require several implementations, according to the context. This paper brings out a general adaptive DAFx diagram, using one or two input sounds and gesture control of the mapping. Effects are classified according to the perceptive parameters that the effects modify. New adaptive effects are presented, such as martianization and vowel colorization. Some items are highlighted, such as specific problems of real-time and non real-time implementation, improvements with control curve scaling, and solutions to particular problems, like quantization methods for delay-line based effects. To illustrate, musical applications are pointed out.