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| 2. |
- Barbosa, Plinio A, et al.
(författare)
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Cross-linguistic similarities and differences of lexical stress realisation in Swedish and Brazilian Portuguese
- 2013
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Ingår i: Nordic Prosody Proceedings of the XIth Conference, Tartu 2012 ; Peter Lang Verlag. - 9783631644270 ; , s. 97-106
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Konferensbidrag (refereegranskat)abstract
- This work aims at characterising and comparing acoustic correlates of lexical stress in Swedish and Brazilian Portuguese (BP). For doing so, a parallel corpus was recorded in three speaking styles (spontaneous, read phrases and read words) with 10 subjects in each language. In both languages duration, F0 standard-deviation and spectral emphasis values for vowels tend to be higher in comparison with unstressed position. These parameters are also robust across styles. F0 standard-deviation is more effective in distinguishing stress levels in Swedish than in BP.
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| 3. |
- Barbosa, Plino A, et al.
(författare)
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On the Robustness of some Acoustic Parameters for Signalling Word Stress across Styles in Brazilian Portuguese
- 2013
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Ingår i: Proceedings of Interspeech 2013 ed. by F. Bimbot, C. Cerisara, C. Fougeron, G. Gravier, L. Lamel, F. Pellegrino, and P. Perrier. - 2308-457X. ; , s. 282-286
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Konferensbidrag (refereegranskat)abstract
- This work aims at examining three classes of acoustic correlates of lexical stress in Brazilian Portuguese (BP) in three speaking styles: informal interview, phrase reading and word list reading. In the framework of an international collaboration, a parallel corpus was recorded in the three speaking styles with 10 subjects so far in each one of the following languages: Swedish, English, French, Italian, Estonian and BP. In BP, duration, F0 standard-deviation and spectral emphasis values for stressed vowels tend to be higher in comparison with vowel acoustic parameters in unstressed position. These three parameters are robust across styles, especially vowel duration, for which circa 50 % of the variance is explained by stress and speaking style factors. The parameters pattern according to stress level is very similar between interview and phrase reading styles, which points to a similar effectiveness of reading and spontaneous styles in uncovering the word stress acoustic correlates in BP.
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| 4. |
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| 5. |
- Eriksson, Anders, 1939, et al.
(författare)
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The Acoustics of Word Stress in Swedish: A Function of Stress Level, Speaking Style and Word Accent
- 2013
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Ingår i: INTERSPEECH 2013. 14thAnnual Conference of the International Speech Communication Association. Lyon, France August 25-29, 2013. - 2308-457X. ; , s. 778-782
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Konferensbidrag (refereegranskat)abstract
- The study presented here is one in a series of studies intended to describe the acoustics of word stress for several typologically different languages in a common framework. The idea is that, when fully developed the methodology should be applicable to any language in the same way regardless of prosodic type. The languages included in the present round of data collection and analyzes are Brazilian Portuguese, English, Estonian, French, Italian and Swedish. The acoustic variables examined here are F0-level, F0-variation, Duration, and Spectral Emphasis for all vowels in the data. All parameters are tested with respect to their correlation with stress level (primary, secondary, unstressed), speaking style (wordlist reading, phrase reading, spontaneous speech) and tonal word accent. The most robust results concerning stress level are found for Duration and F0-variation. Speaking style turned out to play a minimal role. The only robust effect was found for duration which was longer in word list reading. Word accent had a significant effect on F0-variation, and Duration.
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| 6. |
- Eriksson, Anders, 1939, et al.
(författare)
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Word stress in Swedish as a function of stress level, word accent and speaking style
- 2013
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Ingår i: Nordic Prosody Proceedings of the XIth Conference, Tartu 2012 ; Peter Lang Verlag. - 9783631644270 ; , s. 127-136
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Konferensbidrag (refereegranskat)abstract
- This paper presents the results of a first round of analyses of the acoustic correlates of word stress as a function of stress level (primary, secondary, unstressed), word accent (Accent 1, Accent 2) and speaking style (casual, phrase reading, word list reading) for Swedish. The study presented here is part of a series of studies aiming at developing methods and models for describing the acoustics of word stress that can be applied to any language and to suggest a typology of word stress from an acoustic perspective. The languages included at the present stage are Brazilian Portuguese, English, Estonian, French, Italian and Swedish. The acoustic parameters studied so far are vowel duration, fundamental frequency mean and standard deviation, and spectral emphasis. For Swedish these parameters turned out to correlate with stress level, accent and speaking style, but not all to the same degree.
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| 7. |
- Fernandez, Joel, et al.
(författare)
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Linearization of Active Array Transmitters Under Crosstalk via Over-the-Air Observations
- 2023
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Ingår i: European Signal Processing Conference. - 2219-5491. ; , s. 1420-1424
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Konferensbidrag (refereegranskat)abstract
- Finding computationally feasible solutions to linearize active antenna array transmitters is a timely challenge in modern cellular networks, particularly in 5G and the emerging 6G systems. In this paper, we propose a new modeling and parameter estimation approach to characterize the individual power amplifier (PA) units of an active antenna array subject to crosstalk while relying only on over-the-air observations. Additionally, we describe a beam-sweeping based forward model learning procedure and the corresponding closed-loop digital predistortion (DPD) learning algorithm, to efficiently linearize millimeter-wave phased-array transmitters under crosstalk-induced load modulation. The provided numerical results demonstrate excellent parameter estimation and linearization performance, reaching adjacent channel power ratios (ACPRs) as low as -50 to -60 dB with realistic evaluation assumptions.
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| 8. |
- Höglund, Joel, et al.
(författare)
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Poster Abstract: Interconnecting Low-Power Wireless and Power-Line Communications using IPv6
- 2010. - 10
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Konferensbidrag (refereegranskat)abstract
- Wireless sensor networks for building automation and energy management has made great progress in recent years, but the inherent indoor radio range limitations can make communication unpredictable and system deployments difficult. Low-power radio can be combined with low-power Power-Line Communication (PLC) to extend the range and predictability of indoor communication for building management and automation systems. We take the first steps towards exploring the system implications for integration of low-power wireless and PLC in the same network. We leverage IPv6, which allow networks to exist over multiple physical communication media as well as the RPL routing protocol for low-power lossy networks.
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| 10. |
- Leander, John, et al.
(författare)
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Smart condition assessment, surveillance and management of critical bridges
- 2018
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Konferensbidrag (refereegranskat)abstract
- Bridges with critical roles in heavily loaded transport infrastructures often need to be kept in service despiteknown damage and deficiencies. Closing or limiting the traffic on a bridge, leading to traffic diversions, issometimes not a feasible option. The current paper describes an approach for securing the functionalityand the safety of critical bridges by using an innovative smart system for monitoring and conditionassessment. It builds on the use of wireless sensor networks, advanced assessment methods, and cloudbased services for storage and distribution of results. This is an ongoing research project and the progressso far is presented in this paper. A case study of the Old Lidingö Bridge in Stockholm, Sweden, is used todemonstrate the approach. The monitoring system installed, devices for energy harvesting, and methodsfor condition assessment are presented. Some preliminary results on the condition of the bridge are alsopresented.
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