• Beschreibung

    Entwicklung eines Frameworks zur Analyse und Resynthese (Phasenvocoder) und zur graphisch unterstützten Modifikation von Signalen. Die Implementierung erfolgt als STx Script.

    Zur Realisierung dieses Projekts wird die STx Grafik um ein allgemeines Selektions-Tool erweitert (Selektion beliebiger Bereiche). Außerdem wird ein File-Objekt entwickelt, das gleichzeitig vom Script (zur Datengenerierung bzw. Modifikation) und von der Grafik verwendet werden kann.

  • Objective:

    Extend the S_TOOLS-STx graphics library to enable graphs to be rotated and flipped horizontally or vertically without having to recalculate the data.


    The base graphics object class was modified, adding rotation and flip settings. A new macro command was implemented to set a graph's rotation-and-flip values. Each graphic object was then modified to display itself correctly according to these settings.


    Rotating and flipping graphical representations of data can now be achieved with on-macro command, rather than having to modify the data itself.

  • Description:

    A console is extremely helpful when developing scripts and applications. This new script console can execute (almost) all STx commands and allows access to variables and objects. The console was implemented with the help of an extended edit control and a macro class. Command line oriented versions of current STx functionality will be developed as and when needed.

    The script debugger was extended during the console development, and a number of thread synchronisation problems were solved.

  • Description:

    The "STx Script Programming" guide written for internal workshops has been integrated into the online help with the title "Becoming an STx Guru (in 538.338 simple steps)". This chapter contains a general description of the STx script language (including tips and tricks) and an overview of several important STx components and attributes (e.g. shell items).

  • Description:

    The methods for extracting speech parameters, most notably formants have been improved. Firstly, a new method was implemented, which measures formants taking some formant attributes (a model) into account. The model uses frequency range and rate of change attributes. Tracking is limited to the voiced parts of the signal. A test version of this method was integrated into the STx speech analysis application SPEXL.

  • Project Objective:

    The project aims to implement an automatic sound recording system that would allow continuous sound recordings for any length of time (several weeks) without user intervention. The long-term investigation of sound data is used for the observation of noise emission from machines in continuous operation and for the documentation of noise situations. The hardware and system complexity are to be restricted to standard measurement microphones and standard PCs or for continuously running, suitable laptops with external disk storage units.


    The recorder contained in the standard S_TOOLS-STx software package is controlled by the macro programming so that the sound files (about the length of one hour) are generated consecutively with date-and-time specification and then written on the hard disk. The intelligent segmentation algorithms insert automatic "tags" and annotations in real-time or in post-processing. The segmentation data are administrated dynamically and enable the direct inclusion of the recorded sound events in the sound data files, signal analytical processes, and statistical processes. Using the currently available storage units, e.g. disk storage on the scale of 1.28 TByte, continuous measuring (2-canal stereo, 44.1. kHz, 16bit) over a period of 2.5 months is possible.


    For the investigation of noise emissions, e.g. traffic and environmental noise, permanent control stations that measure all sound sources in their time context are needed. Only with a broad analysis of the whole situation can noise pollution and health risks be collected.


    PACS: 43.50.Rq; Project: NOIDESc: Deskriptoren zur Bewertung von Lärmsignalen (FFG-809085, bmvit-isb2).

  • Description:

    Implement a method for up-sampling and down-sampling a signal. The conversion is done by resampling the median of the original signal after applying an ideal TP filter (sinx/x). The method is implemented as an SPAtom and integrated into the SPEXL speech analysis script.


    Convert recordings with unusual sampling rates, match recordings with different sampling rates, and correct 'incorrect' sampling rates.

  • Objective:

    STx includes a number of applications with which one can segment and transcribe signals. All of these applications, however, have additional functionality not necessary for transcription (e.g. parameter extraction), and have not been optimised with transcription in mind. Since transcription and segmentation represents a large part of the time spent on speach analysis, this projects aim is to develop an application which includes everything to need for the job, and is easy to use. The application is included in the speach analysis script SPEXL.


    • waveform and spectrogram signal representations
    • convenient signal bracketing, zoom and playback functionality
    • existing segments displayed in graphs and as list
    • direct input of text and metadata
    • configurable attributes (segment templates)
    • interface to all STx analysis applications
    • hotkeys for all essential functions
  • Description:

    The time/frequency transformations (wavelets, Cohen's class distributions developed in earlier projects (2006/2007) have been integrated into the spectrogram and parameter viewer in STx.

  • Objective:

    SysBahnLärm was a joint project of the ARI with the TU Vienna the Austrian Railways and industrial partners funded by the FFG as well as the ÖBB. Aim of the project was to create a handbook on the systemic reduction of railway noise. The ARI was responsible for the psychoacoustic evaluation of the effects of noise from wheels with different roughness and of different noise reduction systems e.g. rail damping systems. Further, the ARI investigated the emission pattern of the rail-wheel contact using our 64-channel microphone array.


    Using measured train pass-by signals, a psychoacoustic testing procedure was developed and stimuli for this test were selected. Subjects had to rate the relative annoyance of different trains or different noise reduction systems with respect to each other.
    For investigating the rail-wheel contact, a beamforming technique was used in order to determine the point of the maximal emission relative to the top of the rail.


    The handbook should act as a guideline for the different noise reduction measures and their respective advantages and problems.

  • Objective:

    A Gaussian Atom is suitable as an ideal atom for the time frequency representation of the human audio perception. This is not only because of the Gaussian Atom's special mathematic features, but also because of results from existing psychoacoustic studies. Developing a time-frequency mask (occlusion) requires testing the time-frequency masking effects of this atom. So far, short-tape limited signals have not been investigated in masking experiments. Relatively few psychoacoustic experiments have been explored completely, and these have been combined with time-frequency effects.


    In cooperation with the Laboratory for Mechanics and Acoustics / CNRS Marseille, an experimental protocol was developed for testing the time-frequency method of a singular Gaussian atom. Experiments were made for the first time in 2006, and gave the first results concerning the hearing threshold and the existence of such a signal. The experiments that included the masking threshold began as a PhD project before the end of 2006 in Marseille.


    Efficient implementation of a masking filter offers many applications:

    • Sound / Data Compression
    • Sound Design
    • Back-and-Foreground Separation
    • Optimization of Speech and Music Perception

    After completing the testing phase, the algorithms are to be implemented in S_TOOLS-STx


    • Amadée: Time Frequency Representations and Auditory Perception
    • Cotutelle de thèse
    • Experiments studying additivity of masking for multiple maskers


    WTZ (project AMADEUS)


    • Laback, B., Balazs, P., Toupin, G., Necciari, T., Savel, S., Meunier, S., Ystad, S., Kronland-Martinet, R. (2008). Additivity of auditory masking using Gaussian-shaped tones, presented at Acoustics? 08 conference.
  • Objective:

    The most basic model for convolution algorithms is an extension of the simultaneous irrelevance model. A triangle-like function describes the masking effect in the frequency and time direction. Combined, they result in a 2-D function, which is used as convolution on the time-frequency coefficients of the given signal. The resulting information is then used to calculate a threshold function. This can be implemented as a Gabor multiplier. This very simple function should be exchanged for a more elaborate 2-D kernel. A more elaborate 2-D kernel can be developed from the first time frequency masking effect measurements of a Gaussian atom.


    An extension of the simultaneous irrelevance model is used as the most basic model for the convolution algorithm under investigation. A triangle-like function describes the masking effect in the frequency and time direction. Combined, they result in a 2-D function, which is used as convolution on the time-frequency coefficients of the given signal to calculate a threshold function. This can be implemented as a Gabor multiplier. This very simple function should be exchanged for a more elaborate 2-D kernel developed from the first time-frequency masking effect measurements of a Gaussian atom.


    After thoroughly testing this algorithm in psychoacoustic experiments, it will be implemented in STx.


    • R. Kronland-Martinet, S. Ytad, T. Necciari, Modélisation, Synthèse et Contrôle des Signaux Sonores et Musicaux of the LMA / CRNS Marseille
    • S. Meunier, S. Savel, Acoustique perceptive et qualité de l’environnement sonore of the LMA / CRNS Marseille


    This project ended on 28.02.2008 and is incorporated into the 'High Potential'-Project of the WWTF, MULAC.

  • Objective:

    Up to now, a thorough phonetic-acoustic and phonological description of the vowels and the vowel system of Standard Austrian German has not been provided.


    Approximately 11,000 vowels of three female and three male speakers of Standard Austrian German have been segmented and analyzed acoustically.


    Standard Austrian German discerns 13 vowels on five constriction locations:

    • pre-palatal for the /i/ and the /y/ vowels
    • mid-palatal for the /e/ and the /ø/ vowels
    • velar for the /u/ vowels
    • upper pharyngeal for the /o/ vowels
    • lower pharyngeal for /ɑ/

    Each vowel pair consists of a constricted and an unconstricted vowel. The front vowels (pre-palatal and mid-palatal) additionally distinguish rounded and unrounded vowels. The following articulatory features sufficiently discriminate all vowels:

    • [± constricted]
    • [± front]
    • [± prepalatal]
    • [± pharyngeal]
    • [± round]

    Contrary to general assumptions, F1 and F2 do not sufficiently discern the vowels of Standard Austrian German; F3 is necessary as well. Discriminatory ability is maintained over all speaking styles and prosodic positions.

  • Multilateral Scientific and Technological Cooperation in the Danube Region 2017-2018
    Austria, Czech Republic, Republic of Serbia, and Slovak Republic
    Project duration: 01.01.2017 - 31.12.2018

    Project website:

  • Objectives:

    In the context of binaural virtual acoustics, a sound source is positioned in a free-field 3-D space around the listener by filtering it via head-related transfer functions (HRTFs). In a real-time application, numerous HRTFs need to be processed. The long impulse responses of the HRTFs require a high computational power, which is difficult to directly implement on current processors in situations involving more than a few simultaneous sources.

    Technically speaking, an HRTF is a linear time-invariant (LTI) system. An LTI system can be implemented in the time domain by direct convolution or recursive filtering. This approach is computationally inefficient. A computationally efficient approach consists of implementing the system in the frequency domain; however, this approach is not suitable for real-time applications since a very large delay is introduced. A compromise solution of both approaches is provided by a family of segmented-FFT methods, which permits a trade-off between latency and computational complexity. As an alternative, the sub-band method can be applied as a technique to represent linear systems in the time-frequency domain. Recent work has showed that the sub-band method offers an even better tradeoff between latency and computational complexity than segmented-FFT methods. However, the sub-band analysis is still mathematically challenging and its optimum configuration is dependant on the application under consideration.


    TF-VA involves developing and investigating new techniques for configuring the sub-band method by using advanced optimization methods in a functional analysis context. As a result, an optimization technique that minimizes the computational complexity of the sub-band method will be obtained.

    Two approaches will be considered: The first approach designs the time-frequency transform for minimizing the complexity of each HRTF. In the second approach, we will design a unique time-frequency transform, which will be used for a joint implementation of all HRTFs of a listener. This will permit an efficient implementation of interpolation techniques while moving sources spatially in real-time. The results will be evaluated in subjective localization experiments and in terms of localization models.


    • Main participator: Damian Marelli (University of Newcastle, Australia)
    • Co-applicants: Peter Balazs, Piotr Majdak
    • Project begin: November 2011
    • Funding: Lise-Meitner-Programm of the Austrian Science Fund (FWF) [M 1230-N13]
  • Projektteil 02 des Sonderforschungsbereichs Deutsch in Österreich. Variation - Kontakt - Perzeptionfinanziert vom FWF (FWF6002) in Kooperation mit der Universität Salzburg

    Projektleitung: Stephan Elspaß, Hannes Scheutz, Sylvia Moosmüller

    Beginn des Projekts: 1. Jänner 2016


    Gegenstand des Projekts sind die Vielfalt und die Dynamik der verschiedenen Dialekte in Österreich. Auf der Grundlage einer neuen Erhebung sollen in den nächsten Jahren unterschiedliche Forschungsfragen beantwortet werden. Diese lauten etwa: Welche Unterschiede und Veränderungen (z.B. im Wege von Konvergenz-und Divergenzprozessen) lassen sich innerhalb der und zwischen den österreichischen Dialektlandschaften beobachten? Welche Unterschiede im Dialektwandel gibt es zwischen städtischen und ländlichen Gebieten? Lassen sich Generationen- und Genderunterschiede feststellen, die den Dialektwandel betreffen? Welchen Beitrag kann ein umfassender Vergleich von ,real-time‘-und ,apparent-time‘-Analysen zu einer allgemeinen Sprachwandeltheorie leisten?

    Zur Beantwortung dieser Fragestellungen werden in der ersten Erhebungsphase an 40 österreichischen Orten Sprachproben von insgesamt 160 Dialektsprecherinnen und -sprechern aus zwei verschiedenen Altersgruppen aufgenommen und analysiert. Weiters werden von ausgewählten Sprecher/inne/n Aufnahmen im Sprachlabor durchgeführt, um Eigenheiten in der Aussprache phonetisch möglichst exakt bestimmen zu können. In der zweiten Erhebungsphase werden an 100 weiteren Standorten in Österreich ergänzende Laboraufnahmen durchgeführt, um die Unterschiede und die Bewegungen zwischen den Dialektlandschaften noch genauer analysieren zu können. Hier sollen auch neueste dialektometrische Verfahren zum Einsatz kommen, um probabilistische Aussagen in Bezug auf die Variation und den Wandel der Dialekte in Österreich treffen zu können. Die Analysen betreffen alle sprachlichen Ebenen von der Aussprache bis zur Grammatik und zum Wortschatz. Die Dokumentation der gewonnenen Daten erfolgt u. a. digital. Es ist geplant, die Daten am Ende auf der Plattform „Deutsch in Österreich“ einem breiten Publikum zugänglich zu machen, insbesondere in Form des ersten ,sprechenden Sprachatlas‘ von ganz Österreich.

    Projekthomepage der Kooperationspartner in Salzburg


  • Objective:

    One of the biggest problems encountered when building numerical models for layers is the lack of exact deterministic material parameters. Therefore, stochastic models should be use. However, these models have the general drawback of overusing computer resources. This project developed a stochastic model with the ability to use a shear modulus in conjunction with a special iteration scheme allowing efficient implementation.


    With the Karhunen Loeve Expansion (KLE), it is possible to split the stochastic shear modulus, and therefore the whole system, into a deterministic and a stochastic part. These parts can then be transformed into a linear system of equations using finite elements and Chaos Polynomial Decomposition. Combining the KLE and the Fourier Transformation in combination with Plancherel's theorem enables decoupling of the deterministic part into smaller subsystems. An iteration scheme was developed which narrows the application of "costly" routines to only these smaller deterministic subsystems, instead of the whole higher dimensional (up to a dimension of 10,000) system matrix.


    As concerns about vibrations produced by machinery and traffic have increased in past years, models that can predict vibrations in soil became more important. However, since material parameters for soil layers cannot be measured exactly in practice, it is reasonable to use stochastic models.

  • Vowel and consonant quantity in Southern German varieties: D - A - CH project granted by DFG, FWF, SNF

    Principal investigators: Felicitas Kleber, Michael Pucher, Sylvia Moosmüller†, Stephan Schmid 

    Start of the project: 1st of June 2015


    Viele Studien haben eine Beziehung zwischen diachronem Wandel und synchroner Variation, Spracherwerb, internen und externen Faktoren gezeigt. In diesem Vorhaben werden wir diese Themen mittels einer methodisch umfangreichen Studie zur (In-)Stabilität von Quantitätsverhältnissen in Vokal-Konsonant-Sequenzen (VK) in Standardvarietäten und Dialekten des süddeutschen Sprachraums untersuchen. Während die Quantitätsverhältnisse im Schweizerdeutschen diachron relativ stabil geblieben sind (auch moderne Sprachstufen haben einen Vokal- und einen Konsonantenlängen-kontrast), ist der althochdeutsche Konsonantenlängenkontrast im Standarddeutschen verloren gegangen; in den mittelbairischen Varietäten wiederum sind Vokal- und Konsonantenlänge komplementär verteilt. Die bairischen Quantitätsverhältnisse scheinen sich allerdings zu ändern, vermutlich aufgrund von Dialektausgleich. Das Vorhaben ergreift die Gelegenheit, in einer großangelegten Apparent-time-Studie diesen prosodischen Wandel im Fortschritt zu untersuchen und die instabilen Quantitätsverhältnisse mit stabileren in anderen Varietäten zu vergleichen. Das Hauptziel ist die Modellierung der Bedingungen, unter denen sich Quantitätsverhältnisse diachron ändern, um so ein besseres Verständnis prosodischer Wandelprozesse in den Sprachen der Welt zu gewinnen. Das Vorhaben enthält vier konkrete Ziele: (1) eine Typologie der Quantitäten in oberdeutschen Dialekten und den drei nationalen Standardvarietäten aufzustellen; (2) den prosodischen Wandel weiterführend und die Gründe für Wandelprozesse in einigen Varietäten zu untersuchen; (3) den Einfluss interner und externer Faktoren (z.B. Sprechgeschwindigkeit vs. Spracheinstellungen) auf die synchrone Variation in der Produktions-Perzeptionsbeziehung bei Erwachsenen zu prüfen; (4) die Entwicklung von Quantitätsverhältnissen im Erstspracherwerb und eine mögliche Beziehung zwischen synchroner Variation in Kindersprache und prosodischem Wandel zu untersuchen. Die Innovation des Vorhabens liegt in der großangelegten, Varietäten übergreifenden Apparent-time-Studie, die auch Kinder verschiedenen Alters einschließt, der Kombination aus artikulatorischen, akustischen und auditiven Methoden, und der Berücksichtigung sozialer und phonetischer Faktoren.Das geplante Projekt verbindet die am ARI (Wien) etablierten akustischen und soziophonetischen Analysen von Quantitätsverhältnissen in österreichischen Varietäten mit den am IPS (München) entwickelten akustischen, perzeptiven und physiologischen Methoden zur Produktions-Perzeptionsbeziehung bei Sprechern aller Altersgruppen und den am Phonetischen Laboratorium (Zürich) etablierten Methoden zur Typologisierung schweizerdeutscher Varietäten. Langfristig dient die Kollaboration dazu ein Lautwandelmodel an der Phonetik-Phonologie-Schnittstelle zu entwickeln, das die durch dieses Projekt gewonnenen Ergebnisse zu internen und externen Faktoren in der Stabilität von Quantität, Spracherwerb und linguistischem Wandel integriert.


  • Objective:

    This project describes vowel systems of several languages acoustically and compares them. The project's main interest is focused on languages with acoustically insufficient descriptions thus far, e.g. Albanian, Romanian, Ful, Mandinka, or Crioulo.


    Selected speakers are asked to perform a reading task and to speak spontaneously. Vowels in all positions are segmented, labeled, and analyzed. Formant frequencies (F1, F2, F3) are extracted and the vowel systems are defined.

    Language specificity affects not only the number of vowels and their features, but also the extent of variability and stability of certain vowels. A given vowel of language A might be quite stable, whereas the same vowel might exert high variability in language B. In the same way, vowels might be discerned differently. For example, pre-palatal /i/ and mid-palatal /e/ are discerned by F3 in Standard Austrian German (see diagram on SAG), whereas both mid-palatal /i/ and /e/ are predominantly discerned by F2 in Modern Standard Albanian (see diagram on MSA).


    In forensic speaker identification, thorough descriptions of the languages in question are often needed in order to conduct a thorough comparison.

  • FWF DACH I 536-G20: 2011-2013
    Cooperation with the Institute of Phonetics and Speech Processing, LMU Munich.

    Project leader (Austria): Sylvia Moosmüller
    Project leader (Germany): Jonathan Harrington


    Across languages, the distinction between so-called tense and lax vowels, e.g., Miete - Mitte ("rent" - "center") or Höhle - Hölle ("cave" - "hell"), is encountered in many languages. However, many different articulatory adjustments might cause this distinction, and these are language-specific.

    In the current project, we address this issue by analysing high tense and lax vowel pairs of the type bieten - bitten ("to offer" - "to request"), Hüte - Hütte ("hats" - "hut"), and Buße - Busse ("penance" - "busses") in two related language varieties: Standard Austrian German (SAG) and Standard German German (SGG). Previous studies suggest that high lax vowel pairs like bitten, Hütte, or Busse tend to approximate their respective tense cognates bieten, Hüte, and Buße.

    The research questions were investigated by a) comparing the tense and lax vowel pairs in SAG and SGG, b) by investigating whether high lax vowel pairs approximate their tense cognates in SAG, c) by investigating whether the high vowel pairs in SAG are distinguished by quality, by quantity, or by quantity relations with the following consonant, and d) by investigating whether an ongoing sound change can be observed in SAG, with young SAG speakers exhibiting a higher degree to merge the vowels than old SAG speakers.

    Main Results:

    SGG speakers clearly distinguish the high vowel pairs by quality, whereas speaker-specific strategies can be observed in SAG, with some speakers distinguishing high tense and lay vowel pairs by quality, others merging the quality contrast, but restricting the merger to velar contexts only, and still others merging high tense and lax vowels alltogether. In case of distinction, the differences between high tense and high lax vowels are less pronounced in SAG than in SGG and still less pronounced in the speech of young SAG speakers as compared to old SAG speakers. The same result was observed for quantity distinctions: All speakers differentiate the high vowel pairs by quantity, meaning that the tense vowels of the type bieten, Hüte, and Buße are longer than their respective lax cognates. Again, the differences are most pronounced in SGG and least pronounced in the speech of the young SAG speakers, meaning that the tense vowels of the type bieten, Hüte, and Buße are truncated in the speech of young SAG speakers as compared to old SAG speakers and SGG speakers. Results on the quantity interactions of vowel + consonant sequences prove quantifying aspects in SAG. Again, some age-specific differences emerged insofar as overall, young SAG speakers have shorter durations than old SAG speakers. However, they maintain the timing relations observed for the old SAG speakers. Results on perception strongly suggest that SAG speakers make use of quantity cues in order to distinguish the vowel pairs, whereas SGG speakers rather rely on cues connected with quality. Generally, it can be concluded that quantity distinctions are more relevant in SAG than in SGG.

    Project Related Publications:

    Harrington, Jonathan, Hoole, Philip, & Reubold, Ulrich.(2012). A physiological analysis of high front, tense-lax vowel pairs in Standard Austrian and Standard German.Italian Journal of Linguistics, 24, 158-183.

    Brandstätter, Julia & Moosmüller, Sylvia. (in print).Neutralisierung der hohen Vokale in der Wiener Standardsprache – A sound change in progress? In M. Glauninger & A. Lenz (Eds.), Standarddeutsch in Österreich – Theoretische und empirische Ansätze.Vienna: Vandenhoeck & Ruprecht.

    Brandstätter, Julia, Kaseß, Christian H., & Moosmüller, Sylvia (accepted). Quality and quantity in high vowels in Standard Austrian German. In: A. Leemann, M-J. Kolly & V. Dellwo (Eds.), Trends in phonetics and phonology in German-speaking Europe. Zurich: Peter Lang.

    Cunha, Conceição, Harrington, Jonathan, Moosmüller, Sylvia, & Brandstätter, Julia (accepted). The influence of consonantal context on the tense-lax contrast in two standard varieties of German. In: A. Leemann, M-J. Kolly & V. Dellwo (Eds.), Trends in phonetics and phonology in German-speaking Europe.Zurich: Peter Lang.

    Moosmüller, Sylvia. (in print). Methodisches zur Bestimmung der Standardaussprache in Österreich. In: M. Glauninger & A. Lenz (Eds.), Standarddeutsch in Österreich – Theoretische und empirische Ansätze. Vienna: Vandenhoeck & Ruprecht (=Wiener Arbeiten zur Linguistik).

    Moosmüller, Sylvia & Brandstätter, Julia.(in print). Phonotactic Information in the temporal organisation of Standard Austrian German and the Viennese Dialect. Language Sciences.