
António J S TeixeiraUniversity of Aveiro | UA · Department of Electronics, Telecommunications and Informatics
António J S Teixeira
PhD in Electrical Engineering
About
382
Publications
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Introduction
António Teixeira has a MsC in Electronics and Telecomm. and a Ph.D. in Electrical Engineering from the University of Aveiro, Portugal.
Research interests include Speech Processing, Human Language Technologies and Multimodal Human-Machine Interaction.
Involved in several projects (e.g. IRIS, AL4ALL, AAL Paelife) and in the organization of several events (iberSpeech 2016, 2014, 2012; TPC Chair PROPOR 2012; Co-Chair FALA 2010, Special Sessions Chair InterSpeech 2005, Chair PROPOR 2008).
Additional affiliations
October 2014 - April 2024
October 2000 - October 2014
September 1999 - present
Education
March 1995 - July 2000
Publications
Publications (382)
The development of robots that are able to accept instructions,
via a friendly interface, in terms of concepts that are familiar to a
human user remains a challenge. It is argued that designing and building
such intelligent robots can be seen as the problem of integrating four
main dimensions: human-robot communication, sensory motor skills and
per...
Knowledge of the speech production mechanism is essential for the development of speech production models and theories. Magnetic resonance imaging delivers high quality images of soft tissues, has multiplanar capacity and allows for the visualization of the entire vocal tract. To our knowledge, there are no complete and systematic magnetic resonanc...
Background
Several studies have investigated the acoustic effects of diagnosed anxiety and depression. Anxiety and depression are not characteristics of the typical aging process, but minimal or mild symptoms can appear and evolve with age. However, the knowledge about the association between speech and anxiety or depression is scarce for minimal/m...
Motivation
Severe to profound sensorineural hearing loss interferes with a child's development at the cognitive, linguistic, academic, and social levels. Since the beginning of the pediatric auditory rehabilitation program through cochlear implantation in the Ear, Nose, and Throat (ENT) Service of the Coimbra Hospital and University Center (CHUC),...
Invisible health monitoring is currently a topic of global interest within the scientific community. Sensorization of everyday objects can provide valuable health information without requiring any changes in people’s routines. In this work, a feasibility study of photoplethysmography (PPG) acquisition in the lower limbs for continuous and real-time...
Purpose:
The analysis of acoustic parameters contributes to the characterisation of human communication development throughout the lifetime. The present paper intends to analyse suprasegmental features of European Portuguese in longitudinal conversational speech samples of three male public figures in uncontrolled environments across different age...
Uric acid plays important roles in the body, acting as an antioxidant, contributing to the elimination of metabolic waste, and helping to combat some infections. Alterations in uric acid concentration can be important indicators of disease and their real-time and point-of-care monitoring is of extreme importance, for instance in primary care facili...
Motivated by the need to increase knowledge about the effect of age on speech production, and by the lack of speech data on European Portuguese (EP), this work focuses on the development of a speech database, with acoustic data of healthy adults using standardized recording procedures. The objective of this database is to support a comprehensive an...
The way we communicate with speech goes far beyond the words we use and nonverbal cues play a pivotal role in, e.g., conveying emphasis or expressing emotion. Furthermore, speech can also serve as a biomarker for a range of health conditions, e.g., Alzheimer’s. With a strong evolution of speech technologies, in recent years, speech has been increas...
This paper surveys human-inspired speech technologies developed for European Portuguese and the computational models they integrate and made them possible. In this regard, it covers systems for synthesis and recognition as well as information on the methods adopted for the speech production studies that were performed, in parallel, to support them....
Background:
Aphasia describes the lack of the already gained ability to use language in a common way. "Language" here covers all variations of forming or understanding messages.
Objectives:
The APH-Alarm project aims to develop a service concept that provides alternative communication options for people with Aphasia to trigger timely help when n...
Activities of remote guidance are essential in the Industry sector to overcome emerging problems. One important technology to create a common ground between distributed team-members is Mixed Reality (MR). On-site collaborators can receive instructions from remote experts, informing where to act, and what to do. Nevertheless , most studies have focu...
The way we communicate with speech goes far beyond the words we use and nonverbal cues play a pivotal role in, e.g., conveying emphasis or expressing emotion. Furthermore, speech can also serve as a biomarker for a range of health conditions, e.g., Alzheimer's.
With a strong evolution of speech technologies, in recent years, speech has been increas...
Despite speech being inherently dynamic, most of the acoustic studies and age classification experiments have focused on static features (or on delta and delta-delta features) to characterize vowel acoustics. As such, knowledge regarding age effects in vowel acoustics is limited and doesn’t consider the dynamic aspects. This study intends not only...
European Portuguese (EP) is characterized by a large number of nasals encompassing five phonemic nasal vowels. One notable characteristic of these sounds is their dynamic nature, involving both oral and nasal gestures, which makes their study and characterization challenging. The study of nasal vowels, in particular, has been addressed using a wide...
Aphasia and other communication disorders affect a person’s daily life, leading to isolation and lack of self-confidence, affecting independence, and hindering the ability to express themselves easily, including asking for help. Even though assistive technology for these disorders already exists, solutions rely mostly on a graphical output and touc...
For aging speech, there is limited knowledge regarding the articulatory adjustments underlying the acoustic findings observed in previous studies. In order to investigate the age-related articulatory differences in European Portuguese (EP) vowels, the present study analyzes the tongue configuration of the nine EP oral vowels (isolated context and p...
Speech is our most natural and efficient form of communication and offers a strong potential to improve how we interact with machines. However, speech communication can sometimes be limited by environmental (e.g., ambient noise), contextual (e.g., need for privacy), or health conditions (e.g., laryngectomy), preventing the consideration of audible...
Named entity recognition (NER) tasks imply token-level labels. Annotating documents can be time-consuming, costly, and prone to human error. In many real-life scenarios, the lack of labeled data has become the biggest bottleneck preventing NER being effectively used in some domains and with some natural languages, with negative impacts on the quali...
Aging is part of the normal evolution of human beings. However, the knowledge about speech in the older ages is still dispersed and incomplete. Considering conflicting findings reported in prior research, this study aims to contribute to increase our knowledge about age effects on the spontaneous speech of Portuguese adults. In order to analyze the...
Remote Collaboration using Augmented Reality (AR) shows great potential to establish a common ground in physically distributed scenarios where team-members need to achieve a shared goal. However, most research efforts in this field have been devoted to experiment with the enabling technology and propose methods to support its development. As the fi...
Remote collaboration using Augmented Reality (AR) has potential to support physically distributed team-members that need to achieve a common goal by increasing knowledge retention, improving understanding and awareness of the problem and its context. In this vein, the path to achieve usable, realistic and impactful solutions must entail an explicit...
European Portuguese (EP) nasal vowels are characterised by their dynamic nature entailing a gradual variation from an oral into a nasal configuration. The analysis of velar dynamics assumes a particular relevance for improving our understanding of nasal vowel production with an impact, e.g., on articulatory synthesis. Following on previous work, co...
Humans communicate with each other in a multimodal way. Even with several technologies mediating remote communication, face-to-face contact is still our main and most natural way to exchange information. Despite continuous advances in interaction modalities, such as speech interaction, much can be done to improve its naturalness and efficiency, par...
The understanding of human communication development throughout the lifetime involves the characterization of both segmental and suprasegmental parameters. This pilot study intends to analyse suprasegmental (i.e., prosodic) features in conversational longitudinal speech samples in uncontrolled environments. The ProsodyDescriptor Extractor was used...
There is an increasing need for state-of-the-art Central Auditory Processing assessment
for Portuguese native speakers, applicable as early as possible. As a contribution to answering this
need, this paper presents a new battery for Central Auditory Processing assessment for European
Portuguese applicable to children aged 5 and above, named BAPA-PE...
Muitas das situações com que se deparam atualmente os informáticos impõem o recurso à aleatoriedade, assumindo os métodos probabilísticos associados a esta uma importância crescente em áreas como inteligência artificial e ciência dos dados, entre outras.
Com uma abordagem equilibrada entre tópicos teóricos e aplicados, este livro, que sintetiza a v...
Our homes are becoming increasingly sensorized and smarter. However, they are also becoming increasingly complex, making accessing them and their advantages difficult. Assistants have the potential for improving the accessibility of smart homes, by providing everyone with an integrated, natural, and multimodal way of interacting with the home’s eco...
Remote Collaboration mediated by Mixed and Augmented Reality (MR/AR) shows great potential in scenarios where physically distributed collaborators need to establish a common ground to achieve a shared goal. So far, most research efforts have been devoted to creating the enabling technology, overcoming engineering hurdles and proposing methods to su...
Communication is a vital part of our daily lives. It allows us to express ourselves, our needs and feelings, enabling the establishment of relationships with others. Unfortunately, the ability to communicate can often be partially or, even, fully hindered due to a wide range of conditions. Since communication acts as a crucial step for integration,...
The present work aims to expand knowledge on user needs and the motivations of people with disabilities (PwD) in order to create a technological solution for addressing barriers in the accessible tourism market. For this, a user-centered design was followed, putting PwD at the center of the development process. This was obtained by identifying pers...
One of Portuguese distinctive marks is the large nasals inventory,
including five phonemic nasal vowels and three diphthongs.
Previous studies argued for an initial oral part and
a short nasal consonant, probably related to synchronization
between oral and nasal gestures. These studies have considered
discrete descriptions with EMA-flesh points, li...
There is a clear need to address the technological effects of providing conditions for accessibility in tourism. Accessible tourism is becoming very important, and technology may be the tool which will surpass barriers to accessibility in tourism. New information technologies focus not just on the divulgation of information, but also on making sure...
The knowledge about the age effects in speech acoustics is still disperse and incomplete. This study extends the analyses of the effects of age and gender on acoustics of European Portuguese (EP) oral vowels, in order to complement initial studies with limited sets of acoustic parameters, and to further investigate unclear or inconsistent results....
A significant effort has been devoted to the creation of the enabling technology and in the proposal of novel methods to support remote collaboration using Augmented Reality (AR), given the novelty of the field. As the field progresses to focus on the nuances of supporting collaboration and with the growing number of proto- types mediated by AR, th...
The knowledge about the age effects in speech acoustics is still disperse and incomplete. This study extends the analyses of the effects of age and gender on acoustics of European Portuguese (EP) oral vowels, in order to complement initial studies with limited sets of acoustic parameters, and to further investigate unclear or inconsistent results....
Technologies, such as real-time magnetic resonance (RT-MRI), can provide valuable information to evolve our understanding of the static and dynamic aspects of speech by contributing to the determination of which articulators are essential (critical) in producing specific sounds and how (gestures). While a visual analysis and comparison of imaging d...
Speech production studies and the knowledge they bring forward are of paramount importance to advance a wide range of areas including Phonetics, speech therapy, synthesis and interaction. Several technologies have been considered to study static and dynamic features of the articulators and speech motor control, such as electromagnetic articulograph...
Emotions play a key role in our life experiences. In interactive systems, the user’s emotional state can be relevant to provide increased levels of adaptation to the user, but can also be paramount in scenarios where such information might enable us to help users manage and express their emotions (e.g., anxiety), with a positive impact on their dai...
Technologies, such as electromagnetic midsagittal articulography (EMA) and real-time magnetic resonance (RT-MRI), can contribute to improve our understanding of the static and dynamic aspects of speech, namely by providing information regarding which articulators are essential (critical) in producing specific sounds and how (gestures). Previous wor...
The main goal of this Special Issue is to present the latest advances in research and novel applications of speech and language technologies based on the works presented at the IberSPEECH edition held in Barcelona in 2018, paying special attention to those focused on Iberian languages. IberSPEECH is the international conference of the Special Inter...
Nowadays, smart environments, such as Smart Homes, are becoming a reality, due to the access to a wide variety of smart devices at a low cost. These devices are connected to the home network and inhabitants can interact with them using smartphones, tablets and smart assistants, a feature with rising popularity. The diversity of devices, the user's...
Technologies, such as smart sensors, actuators, and other kinds of devices, are often installed in our environments (e.g., our Homes) and available to integrate our daily lives. Despite their installation being motivated by the pursuit of automation and increased efficiency, making these environments usable, acceptable and enjoyable in a sustainabl...
Developing technologies to support individuals with ASD is a growing field of research facing numerous challenges. First, while the individual with ASD is central, the motivations of others, such as parents, are often taken as the motivations of the individual. Second, the desirable cross-disciplinary pollination for improved intervention can often...
Recent advances in real-time magnetic resonance imaging (RT-MRI) for speech studies, providing a considerable increase in time resolution, potentially improve our ability to study the dynamicaspectsofspeechproduction. To take advantage of the sheer amount of the resulting data, automated methods can be used to select, process, and analyze the data,...
In this paper, we present a database developed for studying inner speech brain related areas using functional Magnetic Resonance Imaging (fMRI) in the context of the European Portuguese. First, we addressed the type of stimuli used in inner speech studies. In this sense, considering a preliminary study using a picture naming task, we defined a corp...
Inner speech can be defined as the act of talking silently with ourselves. Several studies aimed to understand how this process is related to speech organization and language. Despite the advances, some results are still contradictory. Importantly, language dependency is scarcely studied. For this first study of inner speech for Portuguese native s...
KEYNOTE (http://dsai.ws/2018/Keynote-speakers/#k4)
Abstract
The environments where we all live are increasingly populated by devices. Our houses, buildings and cities are becoming more “intelligent” and the way we interact with these devices, in our daily life, is changing constantly, consequence of the emergence of new technologies and methods. I...
Nowadays, houses are being equipped with new smart products and smart sensors, from multiple manufacturers, each offering their own options for interaction with providing varying degrees of usability and user experience. This diverse nature of smart homes and buildings, in general, poses new challenges to interaction design and accessibility. To ta...
There is a continued increase in the integration of intelligent devices in our homes. Making these new complex ecosystems accessible poses great challenges, stemming from the very nature of the Home (several spaces separated by walls), the diversity of inhabitants (e.g., children, adults, older adults, persons with temporary or permanent impairment...
In interactive systems, knowing the user's emotional state is not only important to understand and improve overall user experience, but also of the utmost relevance in scenarios where such information might foster our ability to help users manage and express their emotions (e.g., anxiety), with a strong impact on their daily life and on how they in...