Books:
Loizou, P. (2007). Speech Enhancement: Theory and Practice, CRC Press, Boca Raton: FL. [Table of contents]
Kokkinakis, K. and Loizou, P. (2010). Advances in Modern Blind Signal Separation Algorithms: Theory and Applications , Morgan & Claypool Publishers. [Table of contents]
2012
Yousefian, N. and Loizou, P. (2012). "A Dual-Microphone Speech Enhancement Algorithm Based on the Coherence Function," IEEE Trans. Audio, Speech, Language Processing, 20(2), 599-609. [pdf]. [Top ten accessed papers in IEEE - as of Dec 2011] [Audio Demos].
Chen, F. and Loizou, P. (2012). "Impact of SNR and gain-function over- and under-estimation on speech intelligibility," Speech Communication, 154, 272–281 [pdf].
Wojcicki, K. and Loizou, P. (2012). "Channel selection in the modulation domain for improved speech intelligibility in noise," Journal of the Acoustical Society of America, 131(4), 2904-2913. [pdf]
Chen, F. and Loizou, P. (2012). "Contributions of cochlea-scaled entropy and consonant-vowel boundaries to prediction of speech intelligibility in noise," Journal of the Acoustical Society of America, 131(5), 4104–4113. [pdf]
Gopalakrishna, V., Kehtarnavaz, V., Mirzahasanloo, T. and Loizou, P. (2012). "Real-time automatic tuning of noise suppression algorithms for cochlear implant applications," IEEE Trans. Biomedical Engineering, (in press). [pdf]
Spahr, A., Dorman, M., Litvak, L., Van Wie, S., Gifford, R, Loizou, P., Loiselle, L., Oakes, T. and Cook, S. (2012). "Development and validation of the AzBio sentence lists," Ear Hearing, 33(1), 112-117.[link]
Hazrati, O. and Loizou, P. (2012). "Tackling the combined effects of reverberation and masking noise using ideal channel selection," J. Speech Lang. Hearing Research., 55, 500-510. [pdf]
Hazrati, O. and Loizou, P. (2012). "The combined effects of reverberation and noise on speech intelligibility by cochlear implant listeners," International Journal of Audiology, (in press). [Early online].
Kehtarnavaz, N., Gopalakrishna, V. and Loizou, P. (2012). "Recursive Computation of the Discrete Wavelet Transform" in LabVIEW: A Developer's guide to real-world integration, (Fairweather, I and Brumfield, A., eds.), CRC Press, Chapter 7
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2011
Loizou, P. and Kim, G. (2011). "Reasons why Current Speech-Enhancement Algorithms do not Improve Speech Intelligibility and Suggested Solutions," IEEE Trans. Audio, Speech, Language Processing, 19(1), 47-56. [MATLAB code], [pdf]
Kim, G. and Loizou, P. (2011). "Gain-induced speech distortions and the absence of intelligibility benefit with existing noise-reduction algorithms," Journal of the Acoustical Society of America, 130(3), 1581-1596. [MATLAB code] [pdf]
Loizou, P. and Ma, J. (2011). "Extending the articulation index to account for non-linear distortions introduced by noise-suppression algorithms," J. Acoust. Soc. Am., 130(2), 986-995.[MATLAB code] [pdf]
Kokkinakis, K. and Loizou, P. (2011). "The impact of reverberant self-masking and overlap-masking effects on speech intelligibility by cochlear implant listeners," Journal of the Acoustical Society of America, 103(3), 1099-1102. [pdf]
Ma, J. and Loizou, P. (2011). "SNR loss: A new objective measure for predicting the intelligibility of noise-suppressed speech," Speech Communication, [MATLAB code]. [pdf]
Lu, Y. and Loizou, P. (2011). "Estimators of The Magnitude-Squared Spectrum and Methods for Incorporating SNR Uncertainty," IEEE Trans. Audio, Speech, Language Processing,19(5), 1123-1137.[MATLAB code] [pdf]
Loizou, P. (2011). "Speech enhancement algorithms: A survey," in Recent Advances in Robust Speech Recognition Technology, (J. Ramírez and J. M. Górriz, eds.), Chap. 5, pp. 60-102, Bentham Science Publishers, Ltd.
Loizou, P. (2011). "Speech quality assessment," in Multimedia Analysis, Processing and Communications, (Lin et al., eds.), Springer Verlag, vol. 346, pp. 623-654. [pdf].
Li, J., Yang, L., Zhang, J., Yan, T., Hu, Y., Akagi, M. and Loizou, P. (2011). "Comparative intelligibility investigation of single-channel noise-reduction algorithms for Chinese, Japanese, and English," J. Acoust. Soc. Am., 129, 3291-3301.
Chen, F. and Loizou, P. (2011). "Predicting the intelligibility of vocoded and wideband Mandarin Chinese " J. Acoust. Soc. Am., 129, 3281-3290.
Chen, F. and Loizou, P. (2011). "Predicting the intelligibility of vocoded speech," Ear Hear., 32(2) [pdf].
Kokkinakis, K., Hazrati, O. and Loizou, P. (2011). "A channel-selection criterion for suppressing reverberation in cochlear implants," Journal of the Acoustical Society of America, 129(5), 3221-3232 [pdf].
2010
Kim, G. and Loizou, P. (2010). "Improving Speech Intelligibility in Noise Using Environment-Optimized Algorithms," IEEE Trans. Audio, Speech, Language Processing, 18(8), 2080-2090. [pdf]
Kim, G. and Loizou, P. (2010. "Improving Speech Intelligibility in Noise Using a Binary Mask that is Based on Magnitude Spectrum Constraints," IEEE Signal Processing Letters, 17(2), 1010-1013 [pdf]
Kim, G. and Loizou, P. (2010). "A new binary mask based on noise constraints for improved speech intelligibility," Proc. INTERSPEECH, Makuhari, Japan, pp. 1632-1635 [pdf]
Chen, F. and Loizou, P. (2010). "Analysis of a simplified normalized covariance measure based on binary weighting functions for predicting the intelligibility of noise-suppressed speech," Journal of the Acoustical Society of America, 128(6), 3715-3723 [pdf] .
Hu, Y. and Loizou, P. (2010). "Effects of introducing low-frequency harmonics in the perception of vocoded telephone speech ," Journal of the Acoustical Society of America, 128(3), 1280-1289.[pdf]
Li, N. and Loizou, P. (2010). "Masking release and the contribution of obstruent consonants on speech recognition in noise by cochlear implant users," Journal of the Acoustical Society of America, 128(3), 1262-1271.[pdf]
Kokkinakis, K. and Loizou, P. (2010). "Multi-microphone adaptive noise reduction strategies for coordinated stimulation in bilateral cochlear implant devices ," Journal of the Acoustical Society of America, 127(5), 3136-3144 [pdf]
Gopalakrishna, V., Kehtarnavaz, V. and Loizou, P. (2010). "A Recursive Wavelet-Based Strategy for Real-Time Cochlear Implant Speech Processing on PDA Platforms," IEEE Trans. Biomedical Engineering, (in press). [pdf]
Hu, Y. and Loizou, P. (2010). "On the importance of preserving the harmonics and neighboring partials prior to vocoder processing: Implications for cochlear implants," Journal of the Acoustical Society of America, 127(1), 427–434.[pdf]
Hu, Y. and Loizou, P. (2010). "Environment-specific noise suppression for improved speech intelligibility by cochlear implant users ," Journal of the Acoustical Society of America, 127(6), 3689-3695.[pdf]
Chen, F. and Loizou, P. (2010). "Contribution of Consonant Landmarks to Speech Recognition in Simulated Acoustic-Electric Hearing," Ear and Hearing, 31(2), 259-267. [pdf]
2009
Kim, G., Lu, Y., Hu, Y. and Loizou, P. (2009). "An algorithm that improves speech intelligibility in noise for normal-hearing listeners," Journal of the Acoustical Society of America, 126(3), 1486-1494 [pdf] - [MATLAB code & Audio Demos].
Milani, A., Panahi, I. and Loizou, P. (2009). "A New Delayless Subband Adaptive Filtering Algorithm for Active Noise Control Systems," IEEE Trans. Audio, Speech, Language Processing, 17(5), 1038-1045.
Kokkinakis K. and Loizou P. C., (2009). “Selective-tap blind dereverberation for two-microphone enhancement of reverberant speech,” IEEE Signal Processing Letters, 16(11), 961-964. [pdf]
Kokkinakis K. and Loizou P. C. (2009). “Selective–tap blind signal processing for speech separation,” IEEE International Conference of Engineering in Medicine and Biology Society, Minneapolis, MN, USA, September 2–6 [pdf]
Pourmand, N., Suelzle, D., Parsa, V., Hu, Y., and Loizou, P. (2009). "On the use of Bayesian modeling for predicting noise reduction performance," Proc. IEEE Int. Conf. Acoust. , Speech, Signal Processing, 3873-3876. [pdf]
Kim, G. and Loizou, P. (2009). "A data-driven approach for estimating the time-frequency binary mask," Proc. Interspeech, Brighton, UK, Sept 6-9, 2009. [pdf]
Ma, J., Hu, Y. and Loizou, P. (2009). "Objective measures for predicting speech intelligibility in noisy conditions based on new band-importance functions", Journal of the Acoustical Society of America, 125(5), 3387-3405 [ pdf ]
Loizou, P., Hu, Y., Litovsky, P., Yu, G., Peters, R., Lake, J. and Roland, P. (2009). "Speech recognition by bilateral cochlear implant users in a cocktail party setting", Journal of Acoustical Society of America, 125(1), 372-383.
Li, N. and Loizou, P. (2009). "Factors affecting masking release in cochlear implant vocoded speech," Journal of the Acoustical Society of America, 126(1), 338-348. [pdf].
2008
Lu, Y. and Loizou, P. (2008). “A geometric approach to spectral subtraction,” Speech Communication, 50, 453-466. [Matlab code]Hu, Y. and Loizou, P. (2008). “Evaluation of objective quality measures for speech enhancement,” IEEE Transactions on Speech and Audio Processing, 16(1), 229-238. [Matlab code]
Hu, Y. and Loizou, P. (2008). "Techniques for estimating the ideal binary mask,&" Proc. of 11th International Workshop on Acoustic Echo and Noise Control, September 14th-17th, Seattle, Washington. [pdf]
Li, N. and Loizou, P. (2008). “The contribution of obstruent consonants and acoustic landmarks to speech recognition in noise,” Journal of Acoustical Society of America, 124(6), 3947–3958. [pdf]
Li, N. and Loizou, P. (2008). “Factors influencing intelligibility of ideal binary-masked speech: Implications for noise reduction,” Journal of Acoustical Society of America, 123(3), 1673–1682 [pdf]
Cooper, W., Tobey, E. and Loizou, P. (2008). “Music Perception by Cochlear Implant and Normal Hearing Listeners as Measured by the Montreal Battery for Evaluation of Amusia,” Ear and Hearing, 29(4), 618-626.
Li, N. and Loizou, P. (2008). “Effect of spectral resolution on the intelligibility of ideal binary masked speech,” Journal of Acoustical Society of America, 123(4), EL59- EL64.
Li, N. and Loizou, P. (2008). “A glimpsing account for the benefit of simulated combined acoustic and electric hearing,” Journal of Acoustical Society of America, 123(4), 2287–2294.
Kokkinakis, K. and Loizou, P. (2008). “Using blind source separation techniques to improve speech recognition in bilateral cochlear implant patients,” Journal of Acoustical Society of America, 123(4), 2379-2390.
Hu, Y. and Loizou, P. (2008). “A new sound coding strategy for suppressing noise in cochlear implants,” Journal of Acoustical Society of America, 124(1), 498-509.
Bingabr, M., Espinoza-Varas, B. and Loizou, P. (2008). “Simulating the effect of spread of excitation in cochlear implants,” Hearing Research, 241, 73-79.
2007
Hu, Y. and Loizou, P. (2007). “A comparative intelligibility study of single-microphone noise reduction algorithms,” Journal of Acoustical Society of America, 122(3), 1777–1786. [pdf]
Li, N. and Loizou, P. (2007). “Factors influencing glimpsing of speech in noise,” Journal of Acoustical Society of America, 122(2), 1165-1172. [pdf]
Kasturi, K. and Loizou, P. (2007). “Effect of frequency spacing on melody recognition: Acoustic and electric hearing,” Journal of Acoustical Society of America, 122(2), EL29-EL34.[pdf]
Hu, Y., Loizou, P., Li, N. and Kasturi, K. (2007). “Use of a sigmoidal-shaped function for noise attenuation in cochlear implants,” Journal of Acoustical Society of America 122(4), EL128-EL134. [pdf]
Hu, Y. and Loizou, P. (2007). “Subjective evaluation and comparison of speech enhancement algorithms,” Speech Communication, 49, 588-601. [pdf]
Bin, C. and Loizou, P. (2007). “A Laplacian-based MMSE estimator for speech enhancement,” Speech Communication, 49, 134-143. [pdf]
Kasturi, K. and Loizou, P. (2007). “Use of S-Shaped Input-Output Functions for Noise Suppression in Cochlear Implants,” Ear and Hearing, 28(3), 402-411. [pdf]
2006
Hu, Y. and Loizou, P. (2006). “Evaluation of objective measures for speech enhancement, Proceedings of INTERSPEECH-2006, Philadelphia, PA, September 2006.
Hu, Y. and Loizou, P. (2006). “Subjective Comparison of Speech Enhancement Algorithms,” in Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing., Toulouse, France. [pdf]
Rangachari, S. and Loizou, P. (2006). “A noise estimation algorithm for highly non-stationary environments,” Speech Communication, 28, 220-231 [pdf]
2005
Parikh, G. and Loizou, P. (2005). "The influence of noise on vowel and consonant cues," Journal of Acoustical Society of America, 118(6), 3874-3888. [pdf]
Loizou, P. (2005). “Speech enhancement based on perceptually motivated Bayesian estimators of the speech magnitude spectrum,” IEEE Transactions on Speech and Audio Processing, 13(5), 857-869. [pdf]
Chen, B. and Loizou, P. (2005). "Speech enhancement using a MMSE short-time spectral amplitude estimator with Laplacian speech modeling," Proceedings of ICASSP-2005, Philadelphia, PA, May 2005. [pdf]
2004
Y. Hu and P. Loizou (2004). “Incorporating a psychoacoustic model in frequency domain speech enhancement,” IEEE Signal Processing Letters, 11(2), 270-273. [pdf]
Hu, Y. and Loizou, P. (2004). "Speech enhancement by wavelet thresholding the multitaper spectrum," IEEE Transactions on Speech and Audio Processing, 12(1), 59-67. [pdf]
S. Rangachari, P. Loizou and Y. Hu (2004). “A noise estimation algorithm with rapid adaptation for highly non-stationary environments,” Proceedings of ICASSP-2004, Montreal, Canada, May 2004, 305-308.[pdf]
B. Chen and P. Loizou (2004), “Formant frequency estimation in noise,” Proceedings of ICASSP-2004, Montreal, Canada, May 2004, 581-584. [pdf]
2003
Hu and P. Loizou (2003) “A generalized subspace approach for enhancing speech corrupted with colored noise,” IEEE Transactions on Speech and Audio Processing, 11(4), 334-341.[pdf]
Y. Hu and P. Loizou (2003) “A perceptually motivated approach for speech enhancement,” IEEE Transactions on Speech and Audio Processing, 11(5), 457-465. [pdf]
A. Lobo, and P. Loizou (2003). "Voiced/unvoiced speech discrimination in noise using Gabor atomic decomposition,”, Proc. IEEE International Conference on Acoustics, Speech and Signal Processing, I, 820-823.[pdf]
F. Toledos, P. Loizou and A. Lobo (2003). “Subspace and Envelope Subtraction Algorithms for Noise Reduction in Cochlear Implants,” IEEE Conference in Engineering in Medicine and Biology, Cancun, Mexico, 1999-2001.[pdf]
2002
Y. Hu and P. Loizou (2002), “A subspace approach for enhancing speech corrupted with colored noise,” IEEE Signal Processing Letters, 9(7), 204-206.
Y. Hu and P. Loizou, "Perceptually motivated subspace approach for speech enhancement ", in Proc. Inter. Conf. on Spoken Language Processing (ICSLP), pp. 1797-1800, 2002.
Hu, Y. and Loizou, P. (2002). “A subspace approach for enhancing speech corrupted with colored noise, “ Proceedings of ICASSP-2002, Orlando, FL, May 2002.
Kamath, S. and Loizou, P. (2002). “A multi-band spectral subtraction method for enhancing speech corrupted by colored noise, “ Proceedings of ICASSP-2002, Orlando, FL, May 2002.
Bharath Siravara, Neeraj Magotra and Philip Loizou (2002). "A Novel Approach for Single Microphone Active Noise Cancellation," 45th IEEE MWSCAS Conference , August 4-7, 2002 - Tulsa, Oklahoma
2000
Yeary, M. and Loizou, P. (2000). “Adaptive filtering for speech enhancement, “ Ninth DSP Workshop, Hunt, TX, Oct.2000.
Poroy, O. and Loizou, P. (2000). “Development of a speech processor for laboratory experiments with cochlear implant patients,” Proceedings of IEEE ICASSP-2000, Istanbul, Turkey, June 2000.
M. Dorman, P. Loizou, T. Spahr and E. Maloff (2000). “Performance of spectral-maxima and fixed-channel algorithms for coding speech in quiet and in noise,” Ninth DSP Workshop, Hunt, TX, Oct. 2000.
-1999
P. Loizou and A. Spanias (1999). "Improved speech recognition using a subspace projection approach," IEEE Transactions on Speech and Audio Processing, vol.7, no. 3, pp. 343-345. ( Download a copy )
P. Loizou (1998). "Mimicking the human ear," IEEE Signal Processing Magazine, 15(5),101-130.
Z. Tu and P. Loizou (1999). "Speech recognition over the Internet using Java," IEEE International Conference on Acoustics, Speech and Signal Processing,vol. 4, pp. 2367-2370, Phoenix, AZ.
P. Loizou and A. Spanias (1996). "High-performance alphabet recognition," IEEE Transactions on Speech and Audio Processing 4, 430-445.
P. Loizou and A. Spanias (1997). "Improving discrimination of confusable words using the divergence measure," Journal of Acoustical Society of America 101(2), 1106-1111.
P. Loizou, M. Dorman and A. Spanias (1995), "Automatic recognition of syllable-final nasals preceded by /eh/ ," Journal of Acoustical Society of America 97, pp. 1925-1928.
P. Loizou, M. Dorman, and V. Powell (1998). "The recognition of vowels produced by men, women, boys and girls by cochlear implant patients using a 6 channel CIS processor," Journal of Acoustical Society of America, 103(2), 1141-1149.
M. Dorman, P. Loizou and D. Rainey (1997). "Speech intelligibility as a function of the number of channels of stimulation for signal processors using sine-wave and noise-band outputs," Journal of Acoustical Society of America, 102(4), 2403-2411.
M. Dorman and P. Loizou (1997). "Speech intelligibility as a function of the number of channels of stimulation for normal and cochlear implant patients," The American Journal of Otology, 18, S113-S114..
M. Dorman and P. Loizou (1996). "Relative spectral change and formant transitions as cues to labial and alveolar place of articulation," Journal of Acoustical Society of America 100, 3825-3830.
P. Loizou, Robust Speaker-Independent Recognition of a Confusable Vocabulary , Ph.D. Thesis, Arizona State University, 1995. ( download a copy in postscript format)
P. Loizou, M. Deisher, A. Spanias, G. Lim and B. Mears (1994) "A new highly integrated architecture for speech processing and communications applications," Intel Technology Journal, pp. 41-56.
A. Spanias and P. Loizou (1993) "Analysis/synthesis of speech using the short-time Fourier transform and a time-varying ARMA process," IEICE Transactions of Electronics, Communications and Computer Sciences, E76-A, pp. 645-652.
A. Spanias and P. Loizou (1992) "Mixed Fourier/Walsh transform scheme for speech coding at 4.0 kbits/s," IEE Proceedings 139, pp. 473-481.
P. Loizou and A. Spanias (1995) "Improved speech recognition using the weighted average divergence measure," Proceedings of the International Conference on Digital Signal Processing 1, pp. 90-95.
P. Loizou, M. Dorman, and A. Spanias (1995) "Techniques for improved stop and nasal consonant discrimination" 130th Meeting of Acoustical Society of America,
P. Loizou and A. Mekkoth and A. Spanias (1995) "Telephone alphabet recognition for name-retrieval applications", International Conference on Signal Processing Applications and Technology
P. Loizou and A. Spanias (1994), "Context-dependent modeling in alphabet recognition," Proceedings of the IEEE International Symposium on Circuits and Systems, pp. 189-192.
I. Gdoura, P. Loizou and A. Spanias (1993) "Speech processing using higher order statistics," Proceedings of the IEEE International Symposium on Circuits and Systems, pp. 160-163.
A. Spanias, G. Lim, P. Loizou and M. Deisher (1992) "Block time and frequency domain modified covariance algorithms ," Proceedings of the IEEE International Conference on Acoustics,Speech and Signal Processing 5, pp. 529-532.
P. Loizou and A. Spanias (1991) "Low rate speech representations by vector quantizing transform components," Proceedings of the IEEE International Symposium on Circuits and Systems 1, pp. 320-323.
P. Loizou and A. Spanias (1991) "Vector quantization of transform components at 1200 BPS," Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 245-248.
P. Loizou and A. Spanias (1990) "Vector quantization of principal spectral components at 4800 BPS," Proceedings of 24th Asilomar Conference on Signals, Systems and Computers, pp. 654-658.