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Berggren, Magnus
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Publications (5 of 5) Show all publications
Magnus, B., Nilsson, K., Håkansson, L., Agnesson, H. & Hedsten, S. (2012). Noise measurements in incubators at neonatal intensive care unit. In: : . Paper presented at 19th International Congress on Sound and Vibration 2012, ICSV. Vilnius
Open this publication in new window or tab >>Noise measurements in incubators at neonatal intensive care unit
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2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The purpose of this study was to investigate the noise properties and levels of common noise sources in a neonatal intensive care unit (NICU) and in particular inside and around an incubator. Many previous studies have been made on noise levels in NICU, frequently focusing on A-weighted sound levels. In this study it was not assumed that infant's hearing follows the same equal loudness curve as adults and hence instead of A-weighting, short time averaged sound spectra in the frequency range 20 Hz to 20 kHz was logged to identify the frequency distribution of specific noise generating events. It was seen that alarms and CPAP air-flow increased the noise level by up to 8 dB outside but was barely noticed inside when considering the un-weighted noise level. However, by analyzing individual frequencies, most events were noticeable inside the incubator. For instance, frequencies above 1 kHz were increased by 10 dB inside and 11 dB outside the incubator when CPAP was turned on. Opening and closing the incubator increased the un-weighted noise level by 8 dB inside and 7 dB outside.

Place, publisher, year, edition, pages
Vilnius: , 2012
Keywords
A-weighted sound levels, Frequency distributions, Frequency ranges, Neonatal intensive care units, Noise measurements, Noise properties, Sound spectrum, Time-averaged
National Category
Signal Processing Medical and Health Sciences
Identifiers
urn:nbn:se:bth-6932 (URN)oai:bth.se:forskinfoE36CD52C9C7834D6C1257B9B00412E58 (Local ID)9781622764655 (ISBN)oai:bth.se:forskinfoE36CD52C9C7834D6C1257B9B00412E58 (Archive number)oai:bth.se:forskinfoE36CD52C9C7834D6C1257B9B00412E58 (OAI)
Conference
19th International Congress on Sound and Vibration 2012, ICSV
Available from: 2013-07-01 Created: 2013-07-01 Last updated: 2017-03-13Bibliographically approved
Borgh, M., Berggren, M., Schüldt, C., Lindström, F. & Claesson, I. (2011). An improved adaptive gain equalizer for noise reduction with low speech distortion. EURASIP Journal on Audio, Speech, and Music Processing, 7
Open this publication in new window or tab >>An improved adaptive gain equalizer for noise reduction with low speech distortion
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2011 (English)In: EURASIP Journal on Audio, Speech, and Music Processing, ISSN 1687-4714, E-ISSN 1687-4722, Vol. 7Article in journal (Refereed) Published
Abstract [en]

In high-quality conferencing systems, it is desired to perform noise reduction with as limited speech distortion as possible. Previous work, based on time varying amplification controlled by signal-to-noise ratio estimation in different frequency subbands, has shown promising results in this regard but can suffer from problems in situations with intense continuous speech. Further, the amount of noise reduction cannot exceed a certain level in order to avoid artifacts. This paper establishes the problems and proposes several improvements. The improved algorithm is evaluated with several different noise characteristics, and the results show that the algorithm provides even less speech distortion, better performance in a multi-speaker environment and improved noise suppression when speech is absent compared with previous work.

Place, publisher, year, edition, pages
Springer, 2011
Keywords
Speech enhancement, Noise reduction, Noise-level estimation
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-6967 (URN)10.1186/1687-4722-2011-7 (DOI)000299122500005 ()oai:bth.se:forskinfoEF3499AC58836F03C125798A007408EC (Local ID)oai:bth.se:forskinfoEF3499AC58836F03C125798A007408EC (Archive number)oai:bth.se:forskinfoEF3499AC58836F03C125798A007408EC (OAI)
Note
Open Access article Article 7Available from: 2013-05-31 Created: 2012-01-19 Last updated: 2017-12-04Bibliographically approved
Berggren, M., Borgh, M., Schuldt, C., Lindström, F. & Claesson, I. (2011). Low-complexity network echo cancellation approach for systems equipped with external memory. IEEE Transactions on Audio, Speech, and Language Processing, 19(8), 2506-2515
Open this publication in new window or tab >>Low-complexity network echo cancellation approach for systems equipped with external memory
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2011 (English)In: IEEE Transactions on Audio, Speech, and Language Processing, ISSN 1558-7916, E-ISSN 1558-7924, Vol. 19, no 8, p. 2506-2515Article in journal (Refereed) Published
Abstract [en]

Long delays and sparseness characterize impulse responses in telecommunication networks and a vast number of solutions for network echo cancellation have been proposed over the years. In this paper, an approach for detecting dispersive regions of a sparse impulse response and a proportionate normalized least mean square (PNLMS)-based selective updating approach are combined with an adaptive double-talk detector to form a complete solution for echo cancellation. The proposed solution has low computational complexity and is targeted for systems equipped with external memory.

Place, publisher, year, edition, pages
IEEE, 2011
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-7219 (URN)10.1109/TASL.2011.2144972 (DOI)000296889900024 ()oai:bth.se:forskinfo2702207CF5FD5B6AC12578B0002A3BAD (Local ID)oai:bth.se:forskinfo2702207CF5FD5B6AC12578B0002A3BAD (Archive number)oai:bth.se:forskinfo2702207CF5FD5B6AC12578B0002A3BAD (OAI)
Available from: 2012-11-06 Created: 2011-06-15 Last updated: 2017-12-04Bibliographically approved
Berggren, M., Stjernberg, L., Lindström, F. & Claesson, I. (2010). Audio Processing Solution for Video Conference Based Aerobics. Paper presented at International Conference on Consumer Electronics. Paper presented at International Conference on Consumer Electronics. Las Vegas: IEEE
Open this publication in new window or tab >>Audio Processing Solution for Video Conference Based Aerobics
2010 (English)Conference paper, Published paper (Refereed) Published
Abstract [en]

In this paper an audio processing solution for video conference based aerobics is presented. The proposed solution leaves the workout music unaltered by separating it from the speech and processing each signal separately. The speech signal processing is also performed at a lower sample rate, which saves computational power. Real time evaluation of the system shows that high quality music as well as a good two-way communication is maintained during the aerobic session.

Place, publisher, year, edition, pages
Las Vegas: IEEE, 2010
Keywords
Audio, aerobic, video conference, music
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-7839 (URN)10.1109/ICCE.2010.5418960 (DOI)000286972900201 ()oai:bth.se:forskinfo37D682CCFDFD1E71C12576E400313109 (Local ID)978-1-4244-4314-7 (ISBN)oai:bth.se:forskinfo37D682CCFDFD1E71C12576E400313109 (Archive number)oai:bth.se:forskinfo37D682CCFDFD1E71C12576E400313109 (OAI)
Conference
International Conference on Consumer Electronics
Note
Publiced in: Consumer Electronics (ICCE), 2010 Digest of Technical Papers International Conference on, http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5418960Available from: 2012-09-18 Created: 2010-03-12 Last updated: 2015-06-30Bibliographically approved
Berggren, M., Lindström, F., Waye, K. P. & Claesson, I. (2008). Analysis of How the Noise Level Depends on Different Activities in a Child Day-Care Center. Paper presented at Internoise. Paper presented at Internoise. Shanghai
Open this publication in new window or tab >>Analysis of How the Noise Level Depends on Different Activities in a Child Day-Care Center
2008 (English)Conference paper, Published paper (Refereed) Published
Abstract [en]

In child day-care centers the noise level can rise to high levels and in some cases become so high that the people present risk hearing damage. The purpose of this investigation was to study how the noise level depends on the different activities during the day. The study was performed at a child day-care center and 6 children and 5 adult female teachers participated. The participants had a microphone attached next to the ear connected to a wearable digital recorder. A total of 32.5 hours of data was recorded. By listening tests the recorded data could be sorted by activity and by number of people present in the same room as the test subject. Activities were classified as belonging to one of the following: outdoor activity, indoor play, singing, storytelling and gathering. Further, by listening, the data was classified in small group/large group (3 or less/more than 3). The results show that the average noise level (LAeq) for outdoor activity was the highest and was measured to 88.1 dBA (average over 7h52min). Singing was 81.5 dBA (1h26min), indoor play 81.3 dBA (19h21min), storytelling 76.6 dBA (1h09min) and gathering 75.0 dBA (2h44min). The noise level difference between all activities except between singing and indoor play and gathering and storytelling could be verified using t-test (p<0.001). Further, the results showed that the average noise level was 86.6 dBA (14h11min) for the large group and 79.6 dBA (18h21min) for the small group. This difference, of 7.0 dB was statistically validated (p<0.001) using t-test.

Place, publisher, year, edition, pages
Shanghai: , 2008
National Category
Signal Processing
Identifiers
urn:nbn:se:bth-8440 (URN)oai:bth.se:forskinfo238E2AAC99B75409C12574A900433BDE (Local ID)oai:bth.se:forskinfo238E2AAC99B75409C12574A900433BDE (Archive number)oai:bth.se:forskinfo238E2AAC99B75409C12574A900433BDE (OAI)
Conference
Internoise
Available from: 2012-09-18 Created: 2008-08-18 Last updated: 2015-06-30Bibliographically approved
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