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    Catégorie de document Contribution à un colloque ou à un congrès
    Titre New Applications of the Sound Description Interchange Format
    Auteur principal Matthew Wright
    Co-auteurs Adrian Freed, Xavier Rodet, Dominique Virolle, Rolf Woehrmann
    Colloque / congrès ICMC: International Computer Music Conference. Ann Arbor : Octobre 1998
    Comité de lecture Indéterminé
    Copyright Ircam - Centre Georges-Pompidou & CNMAT
    Année 1998
    Statut éditorial Publié

    The Sound Description Interchange Format (SDIF) is a recently-adopted standard that can store a variety of sound representations: time domain, spectral, higher-level models, etc. SDIF's design strikes a balance between an overly strong standard, which would restrict innovative and creative uses, and an overly weak standard, in which it is so easy to modify the format that each institution has its own incompatible version of SDIF, even when using the same sound representation. SDIF's structure as a sequence of time-tagged IFF-style chunks or "frames" supports this balanced extensibility: extra information can be added to standard frame types, and entirely new representations can be defined by new frame types. This paper reviews early uses of SDIF. IUA, IRCAM, and CNMAT have added SDIF support to existing tools for sound analysis and synthesis, using standard frame types for STFT results, spectral peaks, tracked sinusoids (both pseudo-harmonic or not), and fundamental frequencies. Some applications augment these basic representations with additional information such as perceptual salience of each partial and time points for attack, sustain, and release for sounds that fit the model of a single note. An important feature of SDIF is that this kind of custom extra information can be added to standard frame types in a way that allows programs that don't know about the extra information to read and manipulate the basic data. We also review experimental frame types that are being used for innovative new sound representations not yet part of the SDIF standard. IUA's method of taking a sinusoids plus residual model and further analyzing the residual results in an SDIF file with multiple independent streams of data tied together semantically into a single sound object. CNMAT's prototype model for pipe organ sounds is based on the standard exponentially-decaying frame type, but with additional information to give the parameters of a cosine-shaped attack for each partial. IRCAM's Chant software uses FOF synthesis and includes a number of new SDIF frame types. Additional experiments involve using SDIF to generate new data structures for the representation of spectral data. One particularly promising approach rearranges the time tagged frames so they form a matrix of frames indexed by pitch, amplitude, and other global properties of each spectrum. As new uses of SDIF reach maturity they will be added to the standard; therefore it's important for all users of SDIF to make their experimental work known to the SDIF community. This presentation will be of interest both to users wanting to take advantage of these sound representations and to developers interested in integrating their work into the SDIF effort.

    Mots-clés standard / sound representations / sound / analysis and synthesis /
    Equipe Analyse et synthèse sonores
    Cotes Wright98a / 98-110-WRI-NEW-VIN-AS

    © Ircam - Centre Pompidou 2005.