Faust is a functional programming language dedicated to the specification of executable monorate synchronous mu- sical applications. To extend Faust capabilities to domains such as spectral processing, we introduce here a multi- rate extension of the core Faust language. The key idea is to link rate changes to data structure manipulation op- erations: creating a vector-valued output signal divides the rate of input signals by the vector size, while serializing... Lire la suite

Faust is a functional programming language dedicated to the specification of executable monorate synchronous mu- sical applications. To extend Faust capabilities to domains such as spectral processing, we introduce here a multi- rate extension of the core Faust language. The key idea is to link rate changes to data structure manipulation op- erations: creating a vector-valued output signal divides the rate of input signals by the vector size, while serializing vectors multiplies rates accordingly. This interplay be- tween vectors and rates is made possible in the language static semantics by the introduction of dependent types. We present a typing semantics, a denotational semantics and a correctness theorem that show that this extension preserves the language synchonous characteristics. This new design is under implementation in the Faust compiler.

Faust (Functional AUdio STreams) [1] stands for both a programming language and its compiler. Being fully compiled allows Faust to be used as an alternative to C/C++ to develop high-performance audio signal processing applications, DSP libraries and plug-ins for a variety of audio platforms and standards.

In this paper, we will first take assess of 25 years of interactive real-time music, and introduce the problem of preservation of this music for the future generations, that is to say its ability to be re-performed, and not only to preserve the recordings. We present the state of the art in the field of active preservation of real-time works. We then give an overview of the solutions developed by IRCAM and its partners Grame, Armines ParisTech and CIEREC, in th... Lire la suite

In this paper, we will first take assess of 25 years of interactive real-time music, and introduce the problem of preservation of this music for the future generations, that is to say its ability to be re-performed, and not only to preserve the recordings. We present the state of the art in the field of active preservation of real-time works. We then give an overview of the solutions developed by IRCAM and its partners Grame, Armines ParisTech and CIEREC, in the framework of the ASTREE project, and explain the possibilities envisioned in a case study that is En Echo by Philippe Manoury.

Une partition musicale augmentée est une partition mettant en relation un objet musical symbolique avec différentes représentations de son interprétation. La partition musicale est à considérer au sens large, comme un objet graphique permettant de représenter un objet temporel. L'interprétation représente une instance sonore ou gestuelle particulière de la partition. Nous présenterons les fondements théoriques qui sous-tendent la partition augmentée, ainsi qu'u... Lire la suite

Une partition musicale augmentée est une partition mettant en relation un objet musical symbolique avec différentes représentations de son interprétation. La partition musicale est à considérer au sens large, comme un objet graphique permettant de représenter un objet temporel. L'interprétation représente une instance sonore ou gestuelle particulière de la partition. Nous présenterons les fondements théoriques qui sous-tendent la partition augmentée, ainsi qu'une application sous forme d'afficheur mettant en oeuvre les solutions proposées.

An Augmented Music Score is a graphic space providing the representation, composition and manipulation of het- erogeneous music objects (music scores but also images, text, signals...), both in the graphic and time domains. In addition, it supports the representation of the music perfor- mance, considered as a specific sound or gestural instance of the score. This paper presents the theoretical foundation of the augmented music score as well as an application -... Lire la suite

An Augmented Music Score is a graphic space providing the representation, composition and manipulation of het- erogeneous music objects (music scores but also images, text, signals...), both in the graphic and time domains. In addition, it supports the representation of the music perfor- mance, considered as a specific sound or gestural instance of the score. This paper presents the theoretical foundation of the augmented music score as well as an application - an augmented score viewer - that implements the proposed solutions.

Faust 0.9.10 introduces an alternative to OpenMP based parallel code generation using a Work Steal- ing Scheduler and explicit management of worker threads. This paper explains the new option and presents some benchmarks.

We propose a simple method for synchronization of arbitrary graphic objects, based on their time relations. This method relies on segmentation and mappings that are relations between segmentations. The paper gives a formal description of segmentations and mappings and presents Interlude, a framework that implements the proposed method under the form of an augmented music score viewer, opening a new space to music notation.

Faust 0.9.9.6 introduces new compilation options to automatically parallelize audio applications. This paper explains how the automatic parallelization is done and presents some benchmarks.

Faust 0.9.9.5 introduces new compilation options to do automatic parallelization of code using OpenMP. This paper explains how the automatic parallelization is done and presents some benchmarks.

FAUST is a programming language that provides a purely functional approach to signal processing while offering a high level of performance. FAUST aims at being complementary to existing audio languages by offering a viable and efficient alternative to C/C++ to develop signal processing libraries, audio plug-ins or standalone applications. The language is based on a simple and well defined formal semantics. A FAUST program denotes a signal processor, a mathemati... Lire la suite

FAUST is a programming language that provides a purely functional approach to signal processing while offering a high level of performance. FAUST aims at being complementary to existing audio languages by offering a viable and efficient alternative to C/C++ to develop signal processing libraries, audio plug-ins or standalone applications. The language is based on a simple and well defined formal semantics. A FAUST program denotes a signal processor, a mathematical function that transforms input signals into output signals. Being able to know precisely what a program computes is important not only for programmers, but also for compilers needing to generate the best possible code. Moreover these semantics questions are crucial for the long term preservation of music programs. The following paragraphs will give an overview of the language as well as a description of the compiler, including the generation of parallel code.

L'objectif de ce texte est déssayer de répondre à la question suivante: qu'est-ce qui fait qu'un ordinateur et un langage de programmation deviennent des outils d'aide à la création ?

Faust is a functional programming language dedicated to the specification of executable monorate musical applications. We present here a multirate extension of the core of the Faust language, called MR Faust, together with a typing semantics, a denotational semantics and correctness theorems that link them together.

JACK2 is the future JACK version based on the C++ multi-processors Jackdmp version. This paper presents recent developments: the D-Bus based server control system, NetJack2 the redesigned network components for JACK and profiling tools developed during port on Solaris.

The Guido Music Notation format (GMN) is a general purpose formal language for representing score level music in a platform independent plain text and human readable way. Based on this music representation format, the Guido Lib provides a generic, portable library and API for the graphical rendering of musical scores. This paper gives an introduction to the music notation format and to the Guido graphic score rendering engine. An example of application, the Gui... Lire la suite

The Guido Music Notation format (GMN) is a general purpose formal language for representing score level music in a platform independent plain text and human readable way. Based on this music representation format, the Guido Lib provides a generic, portable library and API for the graphical rendering of musical scores. This paper gives an introduction to the music notation format and to the Guido graphic score rendering engine. An example of application, the GuidoSceneComposer, is next presented.

Timing measurements allow developers to help under- standing the behaviour of their JACK based applications. The server code base now allows to record various tim- ing while the server and clients are running and generate scripts to interpret them.

Le format GUIDO Music Notation (GMN) est un langage textuel et lisible de représentation de partitions musicales. Basée sur ce format, la GUIDOLib est une librairie multi-plateformes offrant une API de rendu graphique de partitions musicales. Cet article présente le format GMN et le moteur de rendu GUIDO. Un exemple d'application, le GUIDO Scene Composer, est ensuite décrit.

Two ongoing research projects at Grame aim at providing efficient solution for audio applications on many/multi core systems. The first one is Jack- dmp, a C++ version of the Jack low-latency audio server for multi-core machines. The second is Faust, a compiled DSP language with auto parallelization features. This paper will briefly describe these two projects focusing on multi-core related questions.

VEMUS is a european research project that aims at developing and validating an open music tuition framework for popular wind instruments such as the flute, the saxophone, the clarinet and the recorder. The system will address students of beginning to intermediate level. It proposes an innovative approach both at technological and pedagogical levels. This paper presents the project with a specific focus on the feedback technologies developed to extend the instru... Lire la suite

VEMUS is a european research project that aims at developing and validating an open music tuition framework for popular wind instruments such as the flute, the saxophone, the clarinet and the recorder. The system will address students of beginning to intermediate level. It proposes an innovative approach both at technological and pedagogical levels. This paper presents the project with a specific focus on the feedback technologies developed to extend the instrumental and pedagogic practices.

Nous abordons la visualisation du jeu instrumental sous l'angle de la représentation objective du son, avec pour objectif de rendre apparentes des caractéristiques du signal en termes d'interprétation musicale. Cet article expose les différentes stratégies mises en oeuvre pour exploiter voire amplifier la complémentarité des perceptions visuelles et sonores, avec un point de vue particulier sur les applications dans le domaine de la pédagogie de la pratique ins... Lire la suite

Nous abordons la visualisation du jeu instrumental sous l'angle de la représentation objective du son, avec pour objectif de rendre apparentes des caractéristiques du signal en termes d'interprétation musicale. Cet article expose les différentes stratégies mises en oeuvre pour exploiter voire amplifier la complémentarité des perceptions visuelles et sonores, avec un point de vue particulier sur les applications dans le domaine de la pédagogie de la pratique instrumentale.

VEMUS est un projet de recherche européen qui a pour objectif le développement et la validation d'un système ouvert et interactif d'apprentissage de la pratique instrumentale. Il traite d'instruments à vent tels que la flûte traversière, le saxophone, la clarinette et la flûte à bec. Il s'adresse à des étudiants de niveau débutant à intermédiaire. Il propose une démarche innovante, tant d'un point de vue technologique que sur un plan pédagogique. L'article prés... Lire la suite

VEMUS est un projet de recherche européen qui a pour objectif le développement et la validation d'un système ouvert et interactif d'apprentissage de la pratique instrumentale. Il traite d'instruments à vent tels que la flûte traversière, le saxophone, la clarinette et la flûte à bec. Il s'adresse à des étudiants de niveau débutant à intermédiaire. Il propose une démarche innovante, tant d'un point de vue technologique que sur un plan pédagogique. L'article présente le projet avec un accent particulier sur les technologies de feedback mises en oeuvre pour étendre les pratiques instrumentales et pédagogiques.

Cet article traite de l'annotation visuelle à main levée de partitions musicales dynamiques : par dynamique, nous entendons la possibilité de recomposer, à la volée, les différents objets graphiques à l'intérieur de la page, ce qui nécessite de représenter les différentes annotations en conséquence. Nous décrivons ici les difficultés rencontrées et les solutions apportées au fil du développement de cet outil.

FAUST is a compiled language designed for real-time audio signal processing. It is a free software published under the terms of the GNU General Public License. Sources and binaries are available at source forge : http://faudiostream.sourceforge.net. The demonstration will give an overview of the main features of the language and the compiler through several simple and practical examples.

In this paper we show the possibility of using FAUST (a programming language for function based block oriented programming) to create a fast audio processor in a single chip FPGA environment. The produced VHDL code is embedded in the on-chip processor system and utilizes the FPGA fabric for parallel processing. For the purpose of implementing and testing the code a complete System-On-Chip framework has been created. We use a Digilent board with a XILINX Virtex... Lire la suite

In this paper we show the possibility of using FAUST (a programming language for function based block oriented programming) to create a fast audio processor in a single chip FPGA environment. The produced VHDL code is embedded in the on-chip processor system and utilizes the FPGA fabric for parallel processing. For the purpose of implementing and testing the code a complete System-On-Chip framework has been created. We use a Digilent board with a XILINX Virtex 2 Pro FPGA. The chip has a PowerPC 405 core and the framework uses the on chip peripheral bus to interface the core. The content of this paper presents a proof-of-concept implementation using a simple two pole IIR filter. The produced code is working, although more work has to be done for implementing complex arithmetic operations support.

La pratique d'un instrument de musique, le travail instrumental, son apprentissage, peuvent être vus comme des activités où le feedback joue un rôle prépondérant. Les technologies actuelles permettent d'envisager l'extension des pratiques instrumentales comme une extension du feedback fournit à l'instrumentiste, aussi bien dans les domaines sonores que visuels. Ce sont ces perspectives nouvelles qui sont présentées, avec leurs implications pour le travail instr... Lire la suite

La pratique d'un instrument de musique, le travail instrumental, son apprentissage, peuvent être vus comme des activités où le feedback joue un rôle prépondérant. Les technologies actuelles permettent d'envisager l'extension des pratiques instrumentales comme une extension du feedback fournit à l'instrumentiste, aussi bien dans les domaines sonores que visuels. Ce sont ces perspectives nouvelles qui sont présentées, avec leurs implications pour le travail instrumental et leurs applications dans le domaine pédagogique.

This document is a quick-reference to the Faust language (version 0.9.8), a programming language for real-time signal processing and synthesis that targets high-performance signal processing applications and audio plugins.

Faust is a functional programming language for realtime signal processing and synthesis that targets high-performance signal processing applications and audio plugins. The paper gives a brief introduction to Faust and discusses its interfaces to Q, a general purpose functional programming language, and SuperCollider, an object-oriented sound synthesis language and engine.

RTP MIDI est une extension du protocole RTP (Real-Time Transport Protocol) pour la transmission de flux MIDI. Ce standard décrit un format permettant la paquetisation de toute commande pouvant apparaître légalement sur un câble DIN MIDI 1.0. Il utilise le cadre générique fourni par RTP et les outils qui lui sont associés afin de permettre une transmission de ces données MIDI en temps réel. Un tel protocole pourrait être utilisé dans le cadre d'applications inte... Lire la suite

RTP MIDI est une extension du protocole RTP (Real-Time Transport Protocol) pour la transmission de flux MIDI. Ce standard décrit un format permettant la paquetisation de toute commande pouvant apparaître légalement sur un câble DIN MIDI 1.0. Il utilise le cadre générique fourni par RTP et les outils qui lui sont associés afin de permettre une transmission de ces données MIDI en temps réel. Un tel protocole pourrait être utilisé dans le cadre d'applications interactives ou pour le streaming de fichiers. Le format propose également un mécanisme de réparation en cas de pertes de paquets lorsque le flux est transmis à travers un environnement réseau incertain. Après une brève présentation de MIDI et de RTP, l'article présente le domaine et les enjeux de RTP MIDI puis le format des paquets et les mécanismes de réparation décrits dans ce standard ainsi que, pour finir, nos travaux d'implémentation d'une bibliothèque permettant la création et l'analyse de payloads au format RTP MIDI et pouvant s'intégrer au système MidiShare.

Jack is a low-latency audio server, written for POSIX conformant operating systems such as GNU/Linux. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. We present a new C++ version for multi-processor machines that aims at removing some limitations of the current design: the activation system has been changed for a data flow model and lock-free programming techniques for graph acces... Lire la suite

Jack is a low-latency audio server, written for POSIX conformant operating systems such as GNU/Linux. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. We present a new C++ version for multi-processor machines that aims at removing some limitations of the current design: the activation system has been changed for a data flow model and lock-free programming techniques for graph access have been used.

IMUTUS is an IST European project that aims at the development of an open platform for training students on the recorder. Among the results of the project are two open source libraries for music representation and graphic notation: the MusicXML library, intended to support the MusicXML format and to provide music notation exchange capabilities, and the GUIDO library that provides a powerful graphic score engine. This paper introduces both libraries and describe... Lire la suite

IMUTUS is an IST European project that aims at the development of an open platform for training students on the recorder. Among the results of the project are two open source libraries for music representation and graphic notation: the MusicXML library, intended to support the MusicXML format and to provide music notation exchange capabilities, and the GUIDO library that provides a powerful graphic score engine. This paper introduces both libraries and describes their use in IMUTUS system.

Clock skew is one of the significant issues of real-time networking. We have previously proposed a new algorithm for clock skew detection that operates one a one-way measurement, simply based on time stamped packets. This algorithm was initially targeted to Internet transport context. It has been showed that it is also suitable to low latency transport conditions using an adequate parameters set. This report presents improvements to the algorithm as well as as... Lire la suite

Clock skew is one of the significant issues of real-time networking. We have previously proposed a new algorithm for clock skew detection that operates one a one-way measurement, simply based on time stamped packets. This algorithm was initially targeted to Internet transport context. It has been showed that it is also suitable to low latency transport conditions using an adequate parameters set. This report presents improvements to the algorithm as well as as well as parameters characterization, along with the corresponding performance measurements.