- Acoustic / Audio Signal Processing
- 3D / Spatial Audio
- Array Processing & Spherical Arrays
- Source Localisation & Tracking
- Beamforming & Speech Enhancement
- Distributed Acoustics Sensing processing
Dr Hafezi is an acoustic and audio signal processing engineer & researcher specialised in array processing and 3D audio. His track record of R&D includes over ten publications in various journals, conferences and workshops, international patents, contribution to establishment of a spin-out audio-tech company (LANDR) by QMUL as well as multiple awards, funding and medal of national Physics Olympiad. He has also been the recipient of 'global/exceptional talent' endorsement by the Royal Academy of Engineering. Before joining Imperial as Postdoc, he was a senior signal processing engineer for 2.5 years at Silixa. Dr Hafezi was awarded PhD at Imperial College in 2018 with specialty in spherical microphone arrays processing.
His research interests are in audio signal processing specialised in 3D Audio. As a post doctoral research associate, he currently works or has previously worked on the following projects:
- Augmented Reality (AR) - Head-worn microphone array processing sponsored by Facebook Reality Lab
- Virtual Reality (VR) - Smart compact headset for personalised 3D audio rendering awarded as the winner of 'Wings for Ideas fund' by PFDC
- Hearing Aids - Environment and Listener Optimised Speech Processing for Hearing Enhancement in Real Situations (ELO-SPHERES) funded by EPSRC [grant number EP/S035842/1]
Honours & Awards:
- Wings For Ideas Fund (2021): This award is intended to support ideas with potential outcome as a new venture, product or prototype. Provided by Imperial's Postdocs & Fellows Development Centre (PFDC), UK.
- Global Exceptional Talent Endorsement (2020): 'Exceptional Promise' endorsement as a qualifaction for global talent visa. Provided by Royal Academy of Engineering, UK.
- HARMAN Scholar (2015-16): Two-time recipient of special honour of being named as Harman Scholar in 2015 & 2016. Provided by HARMAN Intenational Industries, US.
- AES Educational Foundation Grant (2015-16): Two-time recipient of AESEF in 2015 & 2016. Provided by Audio Engineering Society, US.
- PhD Scholarship (2014-17): Departmental bursary from EEE Dept. Provided by Imperial College London, UK
- Postgraduate Scholarship (2012-13): Partial-fund for Master degree. Provided by Queen Mary, University of London.
- Undergraduate Scholarship (2009-12): Partial-fund for Bachelor degree. Provided by Queen Mary, University of London.
- Medal of National Physics Olympiad (2008): The bronze medal of Iran's national Physics olympiad among over 200,000 qualified applicants. Provided by Young Scholars Club & National Elite's Foundation, Iran.
- S. Hafezi, A. H. Moore, and P. A. Naylor, “Augmented Intensity Vectors for Direction of Arrival Estimation in the Spherical Harmonic Domain”. IEEE/ACM Transactions on Audio, Speech and Language Processing. Vol. 25, Issue. 10, pp. 1956-1968, Oct 2017.
- S. Hafezi, A. H. Moore, and P. A. Naylor, “Spatial Consistency for Multiple Source Direction-of-Arrival Estimation and Source Counting”. The Journal of the Acoustical Society of America. Vol. 146, Issue 6, pp 4592—4603, Dec 2019.
- S. Hafezi, A. H. Moore, and P. A. Naylor, “Narrowband multi-source direction-of-arrival estimation in the spherical harmonic domain”. The Journal of the Acoustical Society of America. Vol. 149, Issue 4, pp 2292—2303, Apr 2021.
- S. Hafezi, and J. Reiss, "Autonomous multitrack equalisation based on masking reduction", Journal of the Audio Engineering Society, vol. 63, No. 5, pp. 312-323, May 2015.
conferences / workshops:
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Robust Source Counting for DOA estimation using Density-based Clustering", in IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), pp 395-399, Sheffield, UK, Jul 2018.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Multi-Source Estimation Consistency for Improved Multiple Direction-Of-Arrival Estimation", in Workshop on Hands-free Speech Communication and Microphone Arrays (HSCMA), San Francisco, USA, Mar 2017.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Multiple Source Localization using Estimation Consistency in the Time-Frequency Domain", in Proceeding IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), New Orleans, USA, Mar 2017.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Multiple DOA estimation based on Estimation Consistency and Spherical Harmonic MUSIC", in Proceeding European Signal Processing Conference (EUSIPCO), pp 1240-1244, Kos Island, Greece, Sep 2017.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Multiple Source Localization in the Spherical Harmonic Domain using Augmented Intensity Vectors based on Grid Search", in Proceeding European Signal Processing Conference (EUSIPCO), pp 602-606, Budapest, Hungary, Sep 2016.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "3D Acoustic Source Localization in the Spherical Harmonic Domain based on Optimized Grid Search", in Proceeding IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pp 415-419, Shanghai, China, Mar 2016.
- S. Hafezi, A. H. Moore, and P. A. Naylor, "Modelling Source Directivity in Room Impulse Response simulation for Spherical Microphone Arrays", in Proceeding European Signal Processing Conference (EUSIPCO), pp 574-578, Nice, France, Sept 2015.
- M. Farhadiroushan, C. Milne, T. Parker, S. Hafezi, R. Aghayev, V. Mahue, S. Shatalin, “Engineered Distributed Acoustic Flow Profiling Sensing Solutions”. EAGE Workshop on Distributed Fibre Optic Sensing, Vol. 2021, Issue 1, Mar 2021.
- N Minggue, H. Hashim, H. Huey, D. Kamat, Y. Ho, O. Ebokpo, V. Mahue, S. Hafezi, A. Khayyat, C. Milne, B. Pouladi, “A Case Study on the Monitoring of Dual-String heavy Oil Producers in field B, Malaysia, using Distributed Fibre Optic Acoustic and Temperature Sensing”, EAGE Workshop on Fibre Optic Sensing for Energy Applications in Asia Pacific, Vol. 2020, Issue 1, Nov 2020.
- F. Hveding, W. Guraini, V. Mahue, S. Hafezi, “Production Flow Comparison Between Distributed Fibre-Optic Sensing and Conventional PLT in a Cased Hole Horizontal Wellbore With ICD”. Abu Dhabi International Petroleum Exhibition and Conference (ADIPEC), Abu Dhabi, UAE, Nov 2020.
- J. D. Reiss, S. P. Mansbridge, A. Clifford, S. Hafezi, Z. Ma, and N. Jillings, "System and Method for Autonomous Multi-track Audio Processing", UK Patent Application, Application Number: GB1208012.3, Publication Number GB2503867, Filing Date: May 08. 2012. Worldwide Patent Application, Application Number: PCT/GB2013/051184, Publication Number WO2013167884A1, Filing Date: May 07. 2013. US Patent Application, Application Number: US14/398,990 , Publication Number US9654869B2, Filing Date: May 07. 2013
Hafezi S, Moore A, Naylor P, 2021, Narrowband multi-source Direction-of-Arrival estimation in the spherical harmonic domain, Journal of the Acoustical Society of America, Vol:149, ISSN:0001-4966
Hafezi S, Moore AH, Naylor PA, 2019, Spatial consistency for multiple source direction-of-arrival estimation and source counting., Journal of the Acoustical Society of America, Vol:146, ISSN:0001-4966, Pages:4592-4603
et al., 2020, Production flow comparison between distributed fiber-optic sensing and conventional PLT in a cased hole horizontal wellbore with ICD
et al., 2020, A case study on the monitoring of dual-string heavy oil producers in field B, Malaysia, using distributed fibre optic acoustic and temperature sensing