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Aníbal João Sousa Ferreira. Concluiu o(a) Doutoramento em Doutoramento em Engenharia Electrotécnica e de Computadores em 1998 pelo(a) Universidade do Porto Faculdade de Engenharia, Doutoramento em Engenharia Electrotécnica e de Computadores em 1998/11/06 pelo(a) Universidade do Porto Faculdade de Engenharia, Mestrado em Mestrado em Engenharia Electrotécnica e Computadores em 1992 pelo(a) Universidade do Porto Faculdade de Engenharia e Licenciatura em Engenharia Electrotécnica e Computadores em 1988 pelo(a) Universidade do Porto Faculdade de Engenharia. É Professor Associado no(a) Universidade do Porto, Investigador no(a) Instituto de Engenharia de Sistemas e Computadores, Professor Associado no(a) Universidade do Porto Faculdade de Engenharia, Chief Technology Advisor (CTA) no(a) ATC Labs, Inc. e Investigador no(a) Instituto de Engenharia de Sistemas e Computadores. Publicou 17 artigos em revistas especializadas. Possui 1 capítulo(s) de livros e 4 livro(s). Nas suas atividades profissionais interagiu com 64 colaborador(es) em coautorias de trabalhos científicos.
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Identification

Personal identification

Full name
Aníbal João Sousa Ferreira

Citation names

  • Ferreira, Aníbal

Author identifiers

Ciência ID
6212-6ED1-92A9
ORCID iD
0000-0002-7278-6749

Knowledge fields

  • Engineering and Technology - Electrotechnical Engineering, Electronics and Informatics - Telecommunications

Languages

Language Speaking Reading Writing Listening Peer-review
English Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1)
French Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1)
Spanish; Castilian Beginner (A1) Beginner (A1) Beginner (A1) Beginner (A1)
Education
Degree Classification
2023/05/04
Concluded
 Engenharia Eletrotécnica e de Computadores (Título de Agregado)
Universidade do Porto, Portugal
 Aprovado
1998/11
Concluded
 Doutoramento em Engenharia Electrotécnica e de Computadores (Doutoramento)
Universidade do Porto Faculdade de Engenharia, Portugal
"Spectral Coding and Post-Processing of High Quality Audio" (THESIS/DISSERTATION)
 Aprovação por Unanimidade
1992/06
Concluded
 Mestrado em Engenharia Electrotécnica e Computadores (Mestrado)
Universidade do Porto Faculdade de Engenharia, Portugal
"Codificação Perceptual de Áudio Digital Estereofónico" (THESIS/DISSERTATION)
 Muito Bom
1988/07
Concluded
 Engenharia Electrotécnica e Computadores (Licenciatura)
Universidade do Porto Faculdade de Engenharia, Portugal
"Codec de Áudio Digital CCITT-J41" (THESIS/DISSERTATION)
 16 Valores
Affiliation

Science

Category
Host institution 		Employer
1987/06/01 - Current Researcher (Research) Instituto de Engenharia de Sistemas e Computadores, Portugal
1987/06/01 - Current Researcher (Research) Instituto de Engenharia de Sistemas e Computadores, Portugal
2015 - 2018 Researcher (Research) Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
2011 - 2013 Researcher (Research) Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
2007 - 2010 Researcher (Research) Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
1989/01/01 - 1990/09/01 Researcher (Research) Instituto de Engenharia de Sistemas e Computadores, Portugal

Teaching in Higher Education

Category
Host institution 		Employer
2011/12/23 - Current Associate Professor (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
2011/12/23 - Current Associate Professor (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
1987/09/01 - Current Associate Professor (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
1999/01/20 - 2011/12/22 Assistant Professor (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
1999/01/20 - 2011/12/22 Assistant Professor (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
1995/11/22 - 1999/01/19 Assistant (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal
1995/11/22 - 1999/01/19 Assistant (University Teacher) Universidade do Porto Faculdade de Engenharia, Portugal

Others

Category
Host institution 		Employer
2004/04/01 - Current Chief Technology Advisor (CTA) ATC Labs, Inc., United States
2004/04/01 - Current Chief Technology Advisor (CTA) ATC Labs, Inc., United States
2004/05/01 - 2008/12/01 Promotor Principal, Empreendedor Seegnal Research - Tecnologias de Processamento de Sinal, Lda., Portugal
2004/05/01 - 2008/12/01 Promotor Principal, Empreendedor Seegnal Research - Tecnologias de Processamento de Sinal, Lda., Portugal
1992/10/01 - 1995/09/01 Bolseiro Doutorando Junta Nacional para a Investigação Científica e Tecnológica, Portugal
1993/08/01 - 1993/12/01 Consultor AT&T Bell Laboratories, United States
1993/08/01 - 1993/12/01 Consultor AT&T Bell Laboratories, United States
1990/10/01 - 1992/09/01 Bolseiro Mestrando Junta Nacional para a Investigação Científica e Tecnológica, Portugal
1990/10/01 - 1991/09/01 Consultor AT&T Bell Laboratories, United States
1990/10/01 - 1991/09/01 Consultor AT&T Bell Laboratories, United States
1988/10/01 - 1988/12/01 Estagiário nos Laboratórios Philips em Eindhoven, Holanda Philips Research Eindhoven, Netherlands
1988/10/01 - 1988/12/01 Estagiário nos Laboratórios Philips em Eindhoven, Holanda Philips Research Eindhoven, Netherlands
Projects

Contract

Designation Funders
2018/06/01 - 2022/05/31 Reconstrução de voz disfónica para voz natural
POCI-01-0145-FEDER-029308
Principal investigator
Universidade do Porto Faculdade de Engenharia, Portugal

Universidade de Aveiro, Portugal

Universidade do Porto Faculdade de Medicina, Portugal

Universidade de Aveiro Instituto de Engenharia Eletrónica e Informática de Aveiro, Portugal

Centro de Investigação em Tecnologias e Serviços de Saúde, Portugal
Fundação para a Ciência e a Tecnologia
Ongoing
2010/10/01 - 2014/02/28 Tecnologia de Apoio em Tempo-Real ao Canto
PTDC/SAU-BEB/104995/2008
Principal investigator
Universidade do Porto Faculdade de Engenharia, Portugal

Universidade do Porto Faculdade de Medicina, Portugal

Instituto Politécnico do Porto, Portugal

Universidade Católica Portuguesa, Portugal
Fundação para a Ciência e a Tecnologia
Concluded
2007/09/04 - 2010/10/03 Análise Acústica e Aerodinâmica da Produção de Fala por Pacientes com Paralisia Unilateral das Pregas Vocais
PTDC/SAU-BEB/67384/2006
Researcher
Universidade de Aveiro, Portugal

Instituto de Engenharia de Sistemas e Computadores, Portugal
Fundação para a Ciência e a Tecnologia
Concluded
2000/10 - 2003/12 Técnicas Avançadas de Processamento Aplicadas a Sinais de Áudio Digital
MCES-FCT / POSI/CPS/34018/2000
Principal investigator
Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
 Fundação para a Ciência e a Tecnologia
Concluded
2000/10 - 2003/09 Metodologias para a Classificação Automática da Integridade e Qualidade Estrutural de Peças de Cerâmica
MCES-FCT / POSI/CPS/34178/2000
Principal investigator
Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
 Fundação para a Ciência e a Tecnologia
Concluded
2001/01 - 2002/12 Acções Integradas Sobre o Sentido da Audição
MCES-AGCC -Ciência Viva / P-IV-1994
Principal investigator
Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
 Ciência Viva
Concluded
1997/01 - 1999/12 Uma proposta de codificação MPEG-4 Audio para uma norma internacional
MCT-FCT / Praxis XXI 2/2.1/TIT/1644/95
Principal investigator
Instituto de Engenharia de Sistemas e Computadores Tecnologia e Ciência, Portugal
 Fundação para a Ciência e a Tecnologia
Concluded
Outputs

Publications

Book
  1. Lobo, J.; Ferreira, L.; Ferreira, A.J.S.. CARMIE: A conversational medication assistant for heart failure. 2017.
  2. Ferreira, A.. Automatic recognition of isolated vowels using f0-normalized harmonic features. 2009.
    10.1007/978-3-642-05197-5_22
  3. Reis, G.; Fonseca, N.; Fernández De Vega, F.; Ferreira, A.. Hybrid Genetic Algorithm based on Gene Fragment Competition for Polyphonic Music Transcription. 2008.
    10.1007/978-3-540-78761-7_31
  4. Carvalho, M.; Ferreira, A.. Real-time recognition of isolated vowels. 2008.
    10.1007/978-3-540-69369-7_18
  5. Santos, V.C.F.; Sousa, M.F.M.; Ferreira, A.J.S.. Quality assessment of manufactured roof-tiles using digital sound processing. 2003.
Book chapter
  1. Lobo, J; Ferreira, L; Ferreira, AJ. "CARMIE". 2017.
    10.4018/978-1-5225-3926-1.ch033
  2. Ferreira, AJS; IEEE. "A new frequency domain approach to time-scale expansion of audio signals". 3577-3580. 1998.
    10.1109/ICASSP.1998.679649
Conference paper
  1. Ferreira, A.J.S.. "Simple and effective signal processing pinpointing subtle premature ventricular contractions inferred from increasing physical effort". 2022.
    10.1109/CSNDSP54353.2022.9907943
  2. "Exploratory study of European Portuguese stop consonants and fricatives: a comparison between normal and whispered speech". 2021.
    10.36253/978-88-5518-449-6
  3. Silva, J.; Oliveira, M.; Ferreira, A.. "Flexible parametric implantation of voicing in whispered speech under scarce training data". 2021.
    10.23919/Eusipco47968.2020.9287684
  4. Ferreira, A.; Silva, J.; Brito, F.; Sinha, D.. "Impact of a shift-invariant harmonic phase model in fully parametric harmonic voice representation and time/frequency synthesis". 2020.
    10.1109/ICASSP40776.2020.9054496
  5. Silva, J.P.; Oliveira, M.A.; Cardoso, C.F.; Ferreira, A.J.. "Manipulation of the Fundamental Frequency Micro-Variations using a Fully Parametric and Computationally Efficient Speech Model". 2020.
    10.1109/sips50750.2020.9195214
  6. Ferreira, A.J.. "Phonetic-oriented identification of twin speakers using 4-second vowel sounds and a combination of a shift-invariant phase feature (NRD), MFCCs and F0 information". 2019.
  7. Ferreira, A.J.. "On the physiological validity of the group delay response of all-pole vocal tract modeling". 2018.
  8. Ferreira, A.J.; Tribolet, J.M.. "A holistic glottal phase-related feature". 2018.
  9. Ferreira, A.. "First experiments on speaker identification combining a new shift-invariant phase-related feature (NRD), MFCCs and F0 information". 2018.
  10. Ferreira, A.; Fernandes, V.. "Consistency of the F0, Jitter, Shimmer and HNR voice parameters in GSM and VOIP communication". 2017.
    10.1109/ICDSP.2017.8096128
  11. Ferreira, A.. "Implantation of voicing on whispered speech using frequency-domain parametric modelling of source and filter information". 2017.
    10.1109/ISIVC.2016.7893980
  12. Fernandes, V.; Ferreira, A.. "On the relevance of F0, Jitter, Shimmer and HNR acoustic parameters in forensic voice comparisons using GSM, VOIP and contemporaneous high-quality voice recordings". 2017.
  13. Ferreira, A.; Sinha, D.. "Advances to a frequency-domain parametric coder of wideband speech". 2016.
  14. Ferreira, A.; Sinha, D.. "Frequency-domain parametric coding of wideband speech - A first validation model". 2015.
  15. Ferreira, A.. "On the possibility of speaker discrimination using a glottal pulse phase-related feature". 2015.
    10.1109/ISSPIT.2014.7300585
  16. Dias, S.; Ferreira, A.. "A hybrid LF-Rosenberg frequency-domain model of the glottal pulse". 2013.
    10.1109/waspaa.2013.6701892
  17. Mendes, D.; Ferreira, A.. "Speaker identification using phonetic segmentation and normalized relative delays of source harmonics". 2012.
  18. Reis, G.; Fernandéz, F.; Ferreira, A.. "Evolutionary algorithms and automatic transcription of music". 2012.
    10.1145/2330784.2330857
  19. Ventura, J.; Sousa, R.; Ferreira, A.. "Accurate analysis and visual feedback of vibrato in singing". 2012.
    10.1109/isccsp.2012.6217808
  20. Sousa, R.; Ferreira, A.; Alku, P.. "Estimation of harmonic and noise components of the glottal excitation". 2011.
  21. Soiisa, R.; Ferreira, A.. "Importance of the relative delay of glottal source harmonics". 2011.
  22. Sousa, R.; Ferreira, A.. "Singing voice analysis using relative harmonic delays". 2011.
  23. Fonseca, N.; Ferreira, A.; Rocha, A.P.. "Concatenative singing voice resynthesis". 2011.
    10.1109/icdsp.2011.6004986
  24. Fonseca, N.; Ferreira, A.. "Singing voice resynthesis using vocal sound libraries". 2010.
  25. Ferreira, A.; Sousa, R.. "DFT-based frequency estimation under harmonic interference". 2010.
    10.1109/isccsp.2010.5463461
  26. Sousa, R.; Ferreira, A.. "Non-iterative frequency estimation in the DFT magnitude domain". 2010.
    10.1109/isccsp.2010.5463483
  27. Fonseca, N.; Ferreira, A.. "Singing voice resynthesis using vocal sound libraries". 2010.
  28. Ferreira, Aníbal. "Measuring Music Transcription Results Based on a Hybrid Decay/Sustain Evaluation". 2009.
  29. Saeed, S.; Harinarayanan, E.V.; Sinha, D.; Ferreira, A.. "New enhancements to the automatic noise removal (ANR) system utilizing improved noise statistics and multi-band processing". 2008.
  30. Ferreira, A.; Abreu, F.; Sinha, D.. "Stereo ACC real-time audio communication". 2008.
  31. Harinarayanan, E.V.; Annadana, R.; Sinha, D.; Ferreira, A.. "New enhancements to the Audio Bandwidth Extension Toolkit (ABET)". 2008.
  32. Sousa, R.; Ferreira, A.. "Evaluation of existing Harmonic-to-Noise Ratio methods for voice assessment". 2008.
  33. Reis, G.; Fonseca, N.; Fernandez, F.; Ferreira, A.. "A genetic algorithm approach with harmonic structure evolution for polyphonic music transcription". 2008.
    10.1109/ISSPIT.2008.4775722
  34. Dubey, C.; Annadana, R.; Sinha, D.; Ferreira, A.. "New enhancements to Immersive Sound field Rendition (ISR) system". 2007.
  35. Harinarayanan, E.V.; Sinha, D.; Saeed, S.; Ferreira, A.. "A novel automatic noise removal technique for audio and speech signals". 2007.
  36. Annadana, R.; Harinarayanan, E.V.; Sinha, D.; Ferreira, A.. "A novel audio post-processing toolkit for the Enhancement of audio signals coded at low bit rates". 2007.
  37. Dubey, C.; Annadana, R.; Sinha, D.; Ferreira, A.. "Subjective evaluation of immersive Sound Field Rendition system and recent enhancements". 2007.
  38. Annadana, R.; Harinarayanan, E.V.; Ferreira, A.; Sinha, D.. "New results in low bit rate speech coding and bandwidth extension". 2006.
  39. Harinarayanan, E.V.; Sinha, D.; Ferreira, A.. "A novel integrated audio bandwidth extension toolkit (ABET)". 2006.
  40. Raghuram, A.; Ferreira, A.; Sinha, D.. "A new low bit rate speech coding scheme for mixed content". 2006.
  41. Dubey, C.; Gupta, R.; Sinha, D.; Ferreira, A.. "A novel very low bit rate multi-channel audio coding scheme using accurate temporal envelope coding and signal synthesis tools". 2006.
  42. Rocha, A.F.; Leite, A.; Pinto, F.; Ferreira, A.J.S.. "Adaptive audio equalization of rooms based on a technique of transparent insertion of acoustic probe signals". 2006.
  43. Ferreira, A.J.S.; Sirilia, D.. "Audio communication coder". 2006.
  44. Ferreira, A.J.S.; Sinlia, D.. "A new low-delay codec for two-way high-quality audio communication". 2005.
  45. Leite, A.; Ferreira, A.J.S.. "An improved adaptive room equalization in the frequency domain". 2005.
  46. Sinha, D.; Ferreira, A.J.S.; Sen, D.. "A Fractal Self-Similarity Model for the spectral representation of audio signals". 2005.
  47. Sinha, D.; Ferreira, A.J.S.. "A new class of smooth power complementary windows and their application to audio signal processing". 2005.
  48. Rocha, A.F.; Ferreira, A.J.S.. "An accurate method of detection and cancellation of multiple acoustic feedbacks". 2005.
  49. Ferreira, A.J.S.; Sinha, D.. "Accurate spectral replacement". 2005.
  50. Ferreira, A.J.S.. "New signal features for robust identification of isolated vowels". 2005.
  51. Ferreira, A.; Sinha, D.. "Accurate and robust frequency estimation in the odft domain". 2005.
    10.1109/ASPAA.2005.1540205
  52. Sinha, D.; Ferreira, A.J.S.. "A new broadcast quality low bit rate audio coding scheme utilizing novel bandwidth extension tools". 2005.
  53. Keyhl, M.; Herre, J.; Ferreira, A.; Gilchrist, N.H.C.. "Effect of low bit-rate coding upon impaired audio material". 1995.
    10.1049/cp:19950944
Journal article
  1. Jesus, L.M.T.; Castilho, S.; Ferreira, A.; Conceição Costa, M.. "Discriminative segmental cues to vowel height and consonantal place and voicing in whispered speech". Journal of Phonetics 97 (2023): http://www.scopus.com/inward/record.url?eid=2-s2.0-85149293385&partnerID=MN8TOARS.
    10.1016/j.wocn.2023.101223
  2. Silva, JM; Oliveira, MA; Saraiva, AF; Ferreira, AJS. "One-Step Discrete Fourier Transform-Based Sinusoid Frequency Estimation under Full-Bandwidth Quasi-Harmonic Interference". ACOUSTICS (2023):
    10.3390/acoustics5030049
  3. Jesus, LMT; Ferreira, JFS; Ferreira, AJS. "Identification of words in whispered speech: The role of cues to fricatives' place and voicing". JASA EXPRESS LETTERS (2023):
    10.1121/10.0020302
  4. Vaz-Freitas, S.; Pestana, P.M.; Almeida, V.; Ferreira, A.. "Acoustic analysis of voice signal: Comparison of four applications software". Biomedical Signal Processing and Control 40 (2018): 318-323. http://www.scopus.com/inward/record.url?eid=2-s2.0-85031720795&partnerID=MN8TOARS.
    10.1016/j.bspc.2017.09.031
  5. Lobo, J; Ferreira, L; Ferreira, AJS. "A Conversational Medication Assistant for Heart Failure". INTERNATIONAL JOURNAL OF E-HEALTH AND MEDICAL COMMUNICATIONS (2017):
    10.4018/ijehmc.2017100102
  6. Jesus, Luis M. T.; Martinez, Joana; Hall, Andreia; Ferreira, Anibal. "Acoustic Correlates of Compensatory Adjustments to the Glottic and Supraglottic Structures in Patients with Unilateral Vocal Fold Paralysis". Biomed Research International (2015): http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000364080100001&KeyUID=WOS:000364080100001.
    10.1155/2015/704121
  7. Vaz Freitas, S.; Melo Pestana, P.; Almeida, V.; Ferreira, A.. "Integrating voice evaluation: Correlation between acoustic and audio-perceptual measures". Journal of Voice 29 3 (2015): 390.e1-390.e7. http://www.scopus.com/inward/record.url?eid=2-s2.0-84929516606&partnerID=MN8TOARS.
    10.1016/j.jvoice.2014.08.007
  8. Sousa, R.; Ferreira, A.; Alku, P.. "The harmonic and noise information of the glottal pulses in speech". Biomedical Signal Processing and Control 10 1 (2014): 137-143. http://www.scopus.com/inward/record.url?eid=2-s2.0-84897986709&partnerID=MN8TOARS.
    10.1016/j.bspc.2013.12.004
  9. Vaz Freitas, S.; Pestana, P.M.; Almeida, V.; Ferreira, A.. "Audio-perceptual evaluation of portuguese voice disorders - An inter- and intrajudge reliability study". Journal of Voice 28 2 (2014): 210-215. http://www.scopus.com/inward/record.url?eid=2-s2.0-84896702337&partnerID=MN8TOARS.
    10.1016/j.jvoice.2013.08.001
  10. Reis, G.; Fernandéz De Vega, F.; Ferreira, A.. "Automatic transcription of polyphonic piano music using genetic algorithms, adaptive spectral envelope modeling, and dynamic noise level estimation". IEEE Transactions on Audio, Speech and Language Processing 20 8 (2012): 2313-2328. http://www.scopus.com/inward/record.url?eid=2-s2.0-84865356779&partnerID=MN8TOARS.
    10.1109/TASL.2012.2201475
  11. Ferreira, Anibal; Assuncao, P; Faria, S. "Static features in isolated vowel recognition at high pitch". Sigmap 2008: Proceedings of the International Conference on Signal Processing and Multimedia Applications (2008): 63-68. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000258928200012&KeyUID=WOS:000258928200012.
  12. Ferreira, Anibal J. S.. "Static features in real-time recognition of isolated vowels at high pitch". Journal of the Acoustical Society of America 122 4 (2007): 2389-2404. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000250027000052&KeyUID=WOS:000250027000052.
    10.1121/1.2772228
  13. Ferreira, AJS; Restivo, FJO; IEEE. "Grasping the potential of digital signal processing through real-time DSP laboratory experiments". Proceedings of the 2002 Ieee 10th Digital Signal Processing Workshop & 2nd Signal Processing Education Workshop (2002): 286-291. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000185284600056&KeyUID=WOS:000185284600056.
    10.1109/DSPWS.2002.1231119
  14. Ferreira, AJS; IEEE. "Accurate estimation in the ODFT domain of the frequency, phase and magnitude of stationary sinusoids". Proceedings of the 2001 Ieee Workshop on the Applications of Signal Processing To Audio and Acoustics (2001): 47-50. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000172901300012&KeyUID=WOS:000172901300012.
    10.1109/aspaa.2001.969539
  15. Ferreira, AJS; IEEE. "Combined spectral envelope normalization and subtraction of sinusoidal components in the ODFT and MDCT frequency domains". Proceedings of the 2001 Ieee Workshop on the Applications of Signal Processing To Audio and Acoustics (2001): 51-54. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000172901300013&KeyUID=WOS:000172901300013.
    10.1109/aspaa.2001.969540
  16. Ferreira, AJS. "An odd-DFT based approach to time-scale expansion of audio signals". Ieee Transactions on Speech and Audio Processing 7 4 (1999): 441-453. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000080961100008&KeyUID=WOS:000080961100008.
    10.1109/89.771312
  17. Ferreira, AJS. "Convolutional effects in transform coding with TDAC: An optimal window". Ieee Transactions on Speech and Audio Processing 4 2 (1996): 104-114. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:A1996UC34700004&KeyUID=WOS:A1996UC34700004.
    10.1109/89.486060
  18. FERREIRA, AJS; IEEE. "OPTIMIZING HIGH QUALITY AUDIO CODING - ADVANTAGES OF FULL SYSTEM OBSERVABILITY". 1995 International Conference on Acoustics, Speech, and Signal Processing - Conference Proceedings, Vols 1-5 (1995): 3063-3066. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:A1995BD41X00765&KeyUID=WOS:A1995BD41X00765.
  19. JOHNSTON, JD; FERREIRA, AJ; IEEE. "SUM-DIFFERENCE STEREO TRANSFORM CODING". Icassp-92 - 1992 International Conference on Acoustics, Speech, and Signal Processing, Vols 1-5 (1992): B569-B572. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:A1992BW69B00303&KeyUID=WOS:A1992BW69B00303.
Distinctions

Other distinction

2004 CONCURSO DE IDEIAS-Criação de Empresas de Base Tecnológica na Região Norte
Agência Nacional de Inovação SA, Portugal
1999 Prémio Científico IBM 1998
IBM Portugal, Portugal