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This paper is concerned with a novel methodology for generating phonetic questions used in tree-based state tying for speech recognition. In order to implement a speech recognition system, language-dependent knowledge which goes beyond annotated material is usually required. The approach presented here generates phonetic questions for decision trees are based on a feature table that summarizes the articulatory characteristics of each sound. On the one hand, this method allows better language-specific triphone models to be defined given only a feature-table as linguistic input. On the other hand, the feature-table approach facilitates efficient definition of triphone models for other languages since again only a feature table for this language is required. The approach is exemplified with speech recognition systems for English and Thai.
MRI data of German vowels and consonants was acquired for 9 speakers. In this paper tongue contours for the vowels were analyzed using the three-mode factor analysis technique PARAFAC. After some difficulties, probably related to what constitutes an adequate speaker sample for this three-mode technique to work, a stable two-factor solution was extracted that explained about 90% of the variance. Factor 1 roughly captured the dimension low back to high front; Factor 2 that from mid front to high back. These factors are compared with earlier models based on PARAFAC. These analyses were based on midsagittal contours; the paper concludes by illustrating from coronal and axial sections how non-midline information could be incorporated into this approach.
Distributional models of word use constitute an indispensable tool in corpus based lexicological research for discovering paradigmatic relations and syntagmatic patterns (Belica et al. 2010). Recently, word embeddings (Mikolov et al. 2013) have revived the field by allowing to construct and analyze distributional models on very large corpora. This is accomplished by reducing the very high dimensionality of word cooccurrence contexts, the size of the vocabulary, to few dimensions, such as 100-200. However, word use and meaning can vary widely along dimensions such as domain, register, and time, and word embeddings tend to represent only the most prevalent meaning. In this paper we thus construct domain specific word embeddings to allow for systematically analyzing variations in word use. Moreover, we also demonstrate how to reconstruct domain specific co-occurrence contexts from the dense word embeddings.
HMMs are the dominating technique used in speech recognition today since they perform well in overall phone recognition. In this paper, we show the comparison of HMM methods and machine learning techniques, such as neural networks, decision trees and ensemble classifiers with boosting and bagging in the task of articulatory-acoustic feature classification. The experimental results show that HMM methods work well for the classification of such features as vocalic. However, decision tree and bagging outperform HMMs for the fricative classification task since the data skewness is much higher than for the feature vocalic classification task. This demonstrates that HMMs do not perform as well as decision trees and bagging in highly skewed data settings.
Precise multimodal studies require precise synchronisation between audio and video signals. However, raw audio and audio from video recordings can be out of sync for several reasons. In order to re-synchronise them, a dynamic programming (DP) approach is presented here. Traditionally, DP is performed on the rectangular distance matrix comparing each value in signal A with each value in signal B. Previous work limited the search space using for example the Sakoe Chiba Band (Sakoe and Chiba, 1978). However, the overall space of the distance matrix remains identical. Here, a tunnel matrix and its according DP-algorithm are presented. The matrix contains merely the computed distance of two signals to a pre-specified bandwidth and the computational cost is equally reduced. An example implementation demonstrates the functionality on artificial data and on data from real audio and video recordings.
Beyond the stars: exploiting free-text user reviews to improve the accuracy of movie recommendations
(2009)
In this paper we show that the extraction of opinions from free-text reviews can improve the accuracy of movie recommendations. We present three approaches to extract movie aspects as opinion targets and use them as features for the collaborative filtering. Each of these approaches requires different amounts of manual interaction. We collected a data set of reviews with corresponding ordinal (star) ratings of several thousand movies to evaluate the different features for the collaborative filtering. We employ a state-of-the-art collaborative filtering engine for the recommendations during our evaluation and compare the performance with and without using the features representing user preferences mined from the free-text reviews provided by the users. The opinion mining based features perform significantly better than the baseline, which is based on star ratings and genre information only.
In this paper the authors briefly outline editing functions which use methods from computational linguistics and take the structures of natural languages into consideration. Such functions could reduce errors and better support writers in realizing their communicative goals. However, linguistic methods have limits, and there are various aspects software developers have to take into account to avoid creating a solution looking for a problem: Language-aware functions could be powerful tools for writers, but writers must not be forced to adapt to their tools.
In the context of the HyTex project, our goal is to convert a corpus into a hypertext, basing conversion strategies on annotations which explicitly mark up the text-grammatical structures and relations between text segments. Domain-specific knowledge is represented in the form of a knowledge net, using topic maps. We use XML as an interchange format. In this paper, we focus on a declarative rule language designed to express conversion strategies in terms of text-grammatical structures and hypertext results. The strategies can be formulated in a concise formal syntax which is independend of the markup, and which can be transformed automatically into executable program code.
Wolfgang von Kempelen's book "The Mechanism of Human Speech" from 1791 is a famous milestone in the history of speech communication research. It has an enormous relevance for the phonetic sciences and it marks an important turning point for the development of the (mechanical) speech synthesis. So far no English version of this work was available, which excludes many interested researchers. Access to the original versions in German and French is restricted for various reasons. For example the blackletter script of the German version is troublesome for most of today's readers. We report here on a new edition of Kempelen's book which unites a better readable German version and its English translation. It will now also be in a searchable electronic format and has been enriched with many commentaries, which aid in the understanding of details of the late 18th century that are little known or unknown to many researchers today.
Cette contribution discute différents enjeux dégagés lors d’une étude des pratiques professionnelles plurilingues : ces enjeux ont émergé d’une analyse menée collaborativement par deux équipes de chercheurs, à Lyon et à Paris, participant au projet européen DYLAN (6e programme cadre) et élaborant ensemble l’analyse empirique d’un extrait d’une réunion de travail, enregistrée dans le cadre d’une collaboration sur un même terrain. Cette analyse est l’occasion de thématiser de manière exemplaire un certain nombre de questions surgissant de l’étude des contacts des langues dans les contextes professionnels, concernant aussi bien les enjeux épistémologiques que l'engagement du chercheur sur le terrain.
The vowel quality in some diphthongs of Swabian (an upper german dialect) was determined by measurement of first and second formant values. A minimal contrast could be shown between two different diphthong qualities […], where for Standard German only one is assumed, viz. /ai/. The two diphthong qualities differ only slightly in onset and offset vowel quality, so a better understanding of their relationship was expected from an examination of their dynamic aspects. Our preliminary results suggest that there is indeed a difference in the temporal structure of the two diphthongs.
Generierung von Linkangeboten zur Rekonstruktion terminologiebedingter Wissensvoraussetzungen
(2002)
Dieser Beitrag skizziert Strategien zur (semi-)automatischen Annotation von definitorischen Textsegmenten und Termverwendungsinstanzen auf der Grundlage grammatisch annotierter Korpora. Ziel unserer Überlegungen ist es, bei der selektiven Rezeption von Fachtexten in einer Hypertextumgebung die je spezifischen Wissensvoraussetzungen, die der Verwendung von Fachtermini unterliegen und die für das Textverständnis eine entscheidende Rolle spielen, über automatisch generierte Linkangebote rekonstruierbar zu machen.
Der Kurzbeitrag berichtet über ein Projekt ”Hypertextualisierung auf textgrammatischer Grundlage“ (HyTex), in dem erforscht wird, wie sich linear organisierte Dokumente mit semiautomatischen Methoden auf der Grundlage von textgrammatischem Markup und der linguistisch motivierten Modellierung terminologischen Wissens in delinearisierte Hyperdokumente überführen lassen. Ziel ist es, eine Sammlung von Fachtexten so in einen Hypertext zu überführen, dass terminologiebedingte Verständnisschwierigkeiten beim Lesen durch entsprechende Linkangebote aufgelöst werden, so dass die Fachtexte auch von Semi-Experten der Domäne selektiv gelesen werden können. Der Schwerpunkt des Beitrags liegt auf der Modellierung terminologischen Wissens mit XML Topic Maps und dessen Stellenwert für die automatische Erzeugung von Hyperlinks.
In this paper we present work in developing a computerized grammar for the Latin language. It demonstrates the principles and challenges in developing a grammar for a natural language in a modern grammar formalism. The grammar presented here provides a useful resource for natural language processing applications in different fields. It can be easily adopted for language learning and use in language technology for Cultural Heritage like translation applications or to support post-correction of document digitization.
Automatic summarization systems usually are trained and evaluated in a particular domain with fixed data sets. When such a system is to be applied to slightly different input, labor- and cost-intensive annotations have to be created to retrain the system. We deal with this problem by providing users with a GUI which allows them to correct automatically produced imperfect summaries. The corrected summary in turn is added to the pool of training data. The performance of the system is expected to improve as it adapts to the new domain.
There are a number of recent replicas of Wolfgang von Kempelen's speaking machine. Although all of them are explicitly based on Kempelen's own description nearly none of them are identical in construction and sound. In this paper we want to illustrate some of these differences and their reasons for five replicas built by ourselves.
Im vorliegenden Beitrag soll gezeigt werden, wie Konnektoren als sprachliche Mittel zur Aktualisierung von zwei Arten konversationeller Aktivitäten eingesetzt werden können, nämlich von intersubjektiven bzw. gesprächsorganisatorischen Verfahren. Auf intersubjektive Verfahren greift ein Sprecher zurück, um in Kooperation mit seinem Gesprächspartner einen gemeinsamen Wissenshintergrund (common ground) zu schaffen. Durch gesprächsorganisatorische Verfahren greift der Sprecher in die gesprächsthematische Struktur des Interaktionsgeschehens ein. In diesem Beitrag wird die Aktualisierung dieser beiden konversationellen Verfahren am Beispiel der kommunikativen Gattung autobiographisches Interview betrachtet. Diese Gattung ist für eine solche Analyse m. E. besonders geeignet, denn sie zeichnet sich durch eine relativ scharfe Trennung der Gesprächsrollen aus, die das Nachvollziehen des Interaktionsgeschehens erleichtert. An einem autobiographischen Interview sind zwei Subjekte beteiligt: der Interviewte, der als Wissensträger gilt, und der Interviewer, der durch seine Rolle als Gesprächsleiter die Wissensvermittlung begünstigen soll. Der Interviewer ist also mit einer zweifachen Aufgabe konfrontiert, denn er muss die anfängliche Wissensasymmetrie ausgleichen und ist zugleich für die Gesprächsorganisation zuständig. Im Folgenden soll am Beispiel des Konjunktors und veranschaulicht werden, wie der Gebrauch von Konnektoren zur Bewältigung dieser beiden kommunikativen Aufgaben beitragen kann.
German subjectively veridical sicher sein ‘be certain’ can embed ob-clauses in negative contexts, while subjectively veridical glauben ‘believe’ and nonveridical möglich sein ‘be possible’ cannot. The Logical Form of F isn’t certain if M is in Rome is regarded as the negated disjunction of two sentences ¬(cf σ ∨ cf ¬σ) or ¬cf σ ∧ ¬cf ¬σ. Be certain can have this LF because ¬cf σ and ¬cf ¬σ are compatible and nonveridical. Believe excludes this LF because ¬bf σ and ¬bf ¬σ are incompatible in a question-under-discussion context. It follows from this incompatibility and from the incompatibility of bf σ and bf ¬σ that bf ¬σ and ¬bf σ are equivalent. Therefore believe cannot be nonveridical. Be possible doesn’t allow the LF either. Similar to believe, ¬pf σ and ¬pf ¬σ are incompatible. But unlike believe, pf σ and pf ¬σ are compatible.