Yi Xu

Status:	PhD, Reader in Speech Sciences
Address:	Room 318, Chandler House, University College London, 2 Wakefield Street, WC1N 2PF
Phone:	+ 44 (0) 20 7679 4082
Email:	yi.xu@ucl.ac.uk
Home page:	http://www.phon.ucl.ac.uk/home/yi/index.html
Primary Dept.:	Speech, Hearing and Phonetic Sciences
Secondary Dept.:	Linguistics
RAE Research group:	Phonetics
Interests:	Mechanisms of speech production; melodic aspect of speech; intonation modeling, synthesis and recognition; and speech perception as it is related to production.

Research Projects

• Quantitative modeling of tone and intonation (2005)
  with Santitham Prom-on and Bundit Thipakorn, King Mongkut's University of Technology Thonburi, Thailand. To develop a quantitative Target Approximation (qTA) model for simulating F0 contours of speech. Following the articulatory-functional framework of the PENTA model (Xu, 2005), the qTA model simulates the production of tone and intonation as a process of syllable-synchronized sequential target approximation. In the model, tone and intonation are treated as communicative functions that directly specify the parameters of the qTA model. The numerical values of the qTA will be extracted from natural speech via supervised learning. And the quality of the modeling output will be both numerically assessed and perceptually evaluated.
• The size code in the expression of anger and joy in speech (2005)
  With Suthathip Chuenwattanapranithi, King Mongkut's University of Technology Thonburi, Thailand To test the "size code" hypothesis for encoding anger and joy in speech. According to the hypothesis, these two emotions are conveyed in speech by exaggerating or understating the body size of the speaker, just as nonhuman animals exaggerate or understate their body size to communicate threat or appeasement. We will conduct acoustic analysis of publicly available emotional speech databases, and synthesize Thai vowels with a 3D articulatory synthesizer using parameter manipulations suggested by the size code hypothesis, and asked Thai listeners to judge the body size and emotion of the speaker. Initial results are in support of the size code hypothesis.
• Role of sensory feedback in speech production as revealed by the effects of pitch- and amplitude-shifted auditory feedback (2004-2009)
  With Charles Larson and colleagues, Northwestern University, USA (funded by NIH: 2004-2009) The overall goal of this research project is to understand the function of sensory feedback in the control of voice fundamental frequency (F0) and intensity through the technique of reflex testing. The specific aims of the project are: to determine if the pitch-shift and loudness-shift reflex magnitudes depend on vocal task; to determine if the direction of pitch-shift and loudness-shift reflexes depend on the reference used for error correction; and to investigate mechanisms of interaction between kinesthetic and auditory feedback on voice control. The overall hypothesis is that sensory feedback is modulated according to the specific vocal tasks in whish subjects are engaged. By testing reflexes in different tasks, we will learn how sensory feedback is modulated in the tasks. We also hypothesize that auditory reflexes, like reflexes in other parts of the body, may reverse their direction depending on the vocal task. The mechanisms controlling such reflex reversals will be investigated, and this information will be important for understanding some voice disorders. It is also hypothesized that kinesthetic and auditory feedback interact in their control of the voice. Applying temporary anesthetic to the vocal folds and simultaneously testing auditory reflexes will provide important information on brain mechanisms that govern interaction between these two sources of feedback.

Taught Courses

• PLIN3101 Phonetic Theory
• PLIN7108 Tone and Intonation
• HCSCGH12 Speech Processing
• PLING154 Phonetic Theory

Selected Publications

2013

• Lee, A., Xu, Y. (2013). Mora-based pre-low raising in Japanese pitch accent. Interspeech 2013. ( pp.3532-3536).
• Lin, C., Wang, M., Idsardi, W. J., Xu, Y. (2013). Stress processing in Mandarin and Korean second language learners of English. Bilingualism: Language and Cognition , 1-31 doi:10.1017/S1366728913000333.
• Liu, F., Jiang, C., Pfordresher, P. Q., Mantell, J. T., Xu, Y., Yang, Y., Stewart, L. (2013). Individuals with congenital amusia imitate pitches more accurately in singing than in speaking: Implications for music and language processing. Attention, Perception, & Psychophysics doi:10.3758/s13414-013-0506-1.
• Liu, F., Xu, Y., Prom-on, S., Yu, A. C. L. (2013). Morpheme-like prosodic functions: Evidence from acoustic analysis and computational modeling. Journal of Speech Sciences 3(1), 85-140
• Prom-on, S., Birkholz, P., Xu, Y. (2013). Training an articulatory synthesizer with continuous acoustic data. Interspeech 2013. ( pp.349-353).
• Prom-on, S., Xu, Y. (2013). Modeling speech melody as communicative functions with PENTAtrainer2. Tools and Resources for the Analysis of Speech Prosody (TRASP 2013). ( pp.82-85).
• Wang, B., Qadir, T., Xu, Y. (2013). 维吾尔语焦点的韵律实现及感知 [Prosodic encoding and perception of focus in Uygur]. Acta Acoutica Sinica 38, 92-98
• Xu, Y. (2013). ProsodyPro — A Tool for Large-scale Systematic Prosody Analysis. Tools and Resources for the Analysis of Speech Prosody (TRASP 2013). ( pp.7-10).
• Xu, Y., Kelly, A., Smillie, C. (2013). Emotional expressions as communicative signals. In Hancil, S., Hirst, D. (Eds.). Prosody and Iconicity ( pp.33-60). John Benjamins Publishing Co..
• Xu, Y., Lee, A., Wu, W. -. L., Liu, X., Birkholz, P. (2013). Human Vocal Attractiveness as Signaled by Body Size Projection. PLoS ONE 8(4), e62397 doi:10.1371/journal.pone.0062397. Publisher URL

2012

• Chen, Y., Guion-Anderson, S., Xu, Y. (2012). Post-Focus Compression in Second Language Mandarin. Speech Prosody 2012. ( pp.410-413). Shanghai
• Lee, A., Xu, Y. (2012). Revisiting focus prosody in Japanese. Speech Prosody 2012. ( pp.274-277). Shanghai
• Liu, F., Jiang, C., Thompson, W. F., Xu, Y., Yang, Y., Stewart, L. (2012). The Mechanism of Speech Processing in Congenital Amusia: Evidence from Mandarin Speakers. PLoS ONE 7(2), e30374 doi:10.1371/journal.pone.0030374. Publisher URL
• Liu, F., Xu, Y., Patel, A. D., Francart, T., Jiang, C. (2012). Differential recognition of pitch patterns in discrete and gliding stimuli in congenital amusia: Evidence from Mandarin speakers. Brain and Cognition 79, 209-215
• Prom-On, S., Liu, F., Xu, Y. (2012). Post-low bouncing in Mandarin Chinese: acoustic analysis and computational modeling. Journal of the Acoustical Society of America 132(1), 421-432 doi:10.1121/1.4725762. Publisher URL
• Prom-On, S., Xu, Y. (2012). Functional annotation for prosodic synthesis. Speech Prosody 2012. Author URL Publisher URL
• Prom-On, S., Xu, Y. (2012). PENTATrainer2: A hypothesis-driven prosody modeling tool. The 5th ISEL Conference on Experimental Linguistics. ( pp.93-100).
• Prom-On, S., Xu, Y. (2012). Pitch target representation of Thai tones. The 3rd International Symposium on Tonal Aspects of Languages. Author URL Publisher URL
• Taheri Ardali, M., Xu, Y. (2012). Phonetic Realization of Prosodic Focus in Persian. Speech Prosody 2012. ( pp.326-329). Shanghai
• Wang, L., Wang, B., Xu, Y. (2012). Prosodic encoding and perception of focus in Tibetan (Anduo Dialect). Speech Prosody 2012. ( pp.286-289). Shanghai
• Xu, Y. (2012). Function vs. form in speech prosody -- Lessons from experimental research and potential implications for teaching. In Romero-Trillo, J. (Ed.). Pragmatics, Prosody and English Language Teaching ( pp.61-76). New York Springer.
• XU, Y., Chen, S. -. W., Wang, B. (2012). Prosodic focus with and without post-focus compression (PFC): A typological divide within the same language family? . The Linguistic Review 29, 131-147

2011

• Cheng, C., Prom-on, S., Xu, Y. (2011). Modelling extreme tonal reduction in Taiwan Mandarin based on target approximation. The 17th International Congress of Phonetic Sciences. ( pp.468-471). Hong Kong
• Liu, X., Xu, Y. (2011). Attractiveness of female voice based on size projection. The 17th International Congress of Phonetic Sciences. ( pp.1274-1277). Hong Kong
• Noble, L., Xu, Y. (2011). Friendly Speech and Happy Speech – Are they the same? The 17th International Congress of Phonetic Sciences. ( pp.1502-1505). Hong Kong
• Prom-On, S., Liu, F., Xu, Y. (2011). Functional modeling of tone, focus and sentence type in Mandarin Chinese. The 17th International Congress of Phonetic Sciences. ( pp.1638-1641). Author URL Publisher URL
• Prom-On, S., Xu, Y., Liu, F. (2011). Simulating post-L F0 bouncing by modeling articulatory dynamics. INTERSPEECH 2011. ( pp.289-292). Author URL Publisher URL
• Wang, B., XU, Y. (2011). Differential prosodic encoding of topic and focus in sentence-initial position in Mandarin Chinese. Journal of Phonetics 39, 595-611
• Wang, B., Xu, Y., Xu, J. (2011). Prosodic realization of discourse topic in Mandarin Chinese: Comparing professional with non-professional speakers. The 17th International Congress of Phonetic Sciences. ( pp.2086-2089). Hong Kong
• Xu, Y. (2011). Post-focus compression: Cross-linguistic distribution and historical origin. The 17th International Congress of Phonetic Sciences. ( pp.152-155). Hong Kong
• Xu, Y. (2011). Speech prosody: A methodological review. Journal of Speech Sciences 1, 85-115

2010

• Cheng, C., XU, Y., Gubian, M. (2010). Exploring the Mechanism of Tonal Contraction in Taiwan Mandarin. Interspeech 2010. ( pp.2010-2013).
• Gao, H., XU, Y. (2010). Ambisyllabicity in English: How real is it? The 9th Phonetics Conference of China (PCC2010).
• Lee, Y. -. C., Xu, Y. (2010). Phonetic realization of contrastive focus in Korean. Speech Prosody 2010. Chicago
• Patel, A. D., Xu, Y., Wang, B. (2010). The role of F0 variation in the intelligibility of Mandarin sentences. Speech Prosody 2010. Chicago
• Prom-on, S., Xu, Y. (2010). The qTA Toolkit for Prosody: Learning Underlying Parameters of Communicative Functions through Modeling. Speech Prosody 2010. Chicago
• Wu, W. L., Xu, Y. (2010). Prosodic Focus in Hong Kong Cantonese without Post-focus Compression. Speech Prosody 2010.
• Xu, Y. (2010). In defense of lab speech. Journal of Phonetics 38, 329-336 doi:10.1016/j.wocn.2010.04.003.
• Xu, Y. (2010). Understanding speech from the perspective of communicative functions and coding mechanisms. In Pan, W., Shen, Z. (Eds.). Joy of Research — A Festschrift in Honor of Professor William S-Y Wang on his Seventy-fifth Birthday ( pp.365-375). Shanghai Shanghai Education Press.
• Xu, Y., Chen, S., Wang, B. (2010). Prosodic focus with post-focus compression: Single or Multiple Origin? The 2nd Symposium on Evolutionary Linguistics.
• Xu, Y., Kelly, A. (2010). Perception of anger and happiness from resynthesized speech with size-related manipulations. Speech Prosody 2010. Chicago
• Xu, Y., Prom-on, S. (2010). Articulatory-Functional Modeling of Speech Prosody: A Review. Interspeech 2010.

2009

• Chen, S. -. W., Wang, B., Xu, Y. (2009). Closely related languages, different ways of realizing focus. Interspeech 2009. ( pp.1007-1010).
• Cheng, C., Xu, Y. (2009). Extreme reductions: Contraction of disyllables into monosyllables in Taiwan Mandarin. Interspeech 2009. ( pp.456-459).
• Gauthier, B., Shi, R., Xu, Y. (2009). Learning Prosodic Focus from Continuous Speech Input: A Neural Network Exploration. Language Learning and Development 5, 94-114
• Liu, H., Xu, Y., Larson, C. (2009). Attenuation of vocal responses to pitch perturbations during Mandarin speech. Journal of the Acoustical Society of America 125, 2299-2306
• Prom-On, S., Xu, Y., Thipakorn, B. (2009). Modeling tone and intonation in Mandarin and English as a process of target approximation. Journal of the Acoustical Society of America 125(1), 405-424
• Tokuma, S., Xu, Y. (2009). The effect of F0 peak-delay on the L1 / L2 perception of English lexical stress. Interspeech 2009. ( pp.1687-1690).
• Xu, Y. (2009). In defense of lab speech in prosody research. In Fant, G., Fujisaki, H., Shen, J. (Eds.). Frontiers in Phonetics and Speech Science — Festtschrift for Professor Wu Zongji's 100th birthday ( pp.381-390). The Commercial Press.
• Xu, Y. (2009). Timing and coordination in tone and intonation-An articulatory-functional perspective. Lingua 119, 906-927
• Xu, Y., Wang, M. (2009). Organizing syllables into groups-Evidence from F-0 and duration patterns in Mandarin. Journal of Phonetics 37, 502-520

2008

• Chuenwattanapranithi, S., Y Xu, B. T., Maneewongvatana, S. (2008). Encoding Emotions in Speech with the Size Code A Perceptual Investigation. Phonetica 65, 210-230
• Xu, Y. (2008). In defense of lab speech in prosody research. The 8th Phonetics Conference of China and The International Symposium on Phonetics Frontiers. Beijing
• Xu, Y. (2008). Multi-dimensional information coding in speech. Speech Prosody 2008, Campinas, Brazil. ( pp.17-26).

2007

• Chen, S. H., Liu, H., Xu, Y., Larson, C. R. (2007). Voice F0 Responses to Pitch-Shifted Voice Feedback During English Speech. Journal of the Acoustical Society of America. 121(2), 1157-1163
• Chuenwattanapranithi, S., Xu, Y., Thipakorn, B., Maneewongvatana, S. (2007). The roles of pitch contour in differentiating anger and joy in speech. International Journal of Signal Processing 3, 129-134
• Gauthier, B., Shi, R. A. X., Y, (2007). Simulating the acquisition of lexical tones from continuous dynamic input. Journal of the Acoustical Society of America 121, EL190-195 Author URL
• Gauthier, B., Shi, R., Xu, Y. (2007). Learning phonetic categories by tracking movements. Cognition 103(1), 80-106 doi:10.1016/j.cognition.2006.03.002. Author URL
• Kuo, Y. C., Xu, Y., Yip, M. (2007). The phonetics and phonology of apparent cases of iterative tonal change in Standard Chinese. In Gussenhoven, C., Riad, T. (Eds.). Tones and Tunes Vol 2: Experimental Studies in Word and Sentence Prosody ( pp.211-237). Berlin Mouton de Gruyter.
• Liu, F., Xu, Y. (2007). Question intonation as affected by word stress and focus in English. The 16th International Congress of Phonetic Sciences. ( pp.1189-1192).
• Liu, F., Xu, Y. (2007). The Neutral Tone in Question Intonation in Mandarin. Interspeech 2007. ( pp.630-633).
• Liu, H., Zhang, Q., Xu, Y., Larson, C. (2007). Compensatory responses to loudness-shifted voice feedback during production of Mandarin speech. Journal of the Acoustical Society of America 122, 2405-2412
• Olsberg, M., Xu, Y. G., G, (2007). Dependence of tone perception on syllable perception. Interspeech 2007. ( pp.2649-2652).
• Wong, Y. W., Xu, Y. (2007). Consonantal perturbation of f0 contours of Cantonese tones. The 16th International Congress of Phonetic Sciences. ( pp.1293-1296).
• Xu, Y. (2007). Speech as articulatory encoding of communicative functions. The 16th International Congress of Phonetic Sciences. ( pp.25-30).
• Xu, Y., Chuenwattanapranithi, S. (2007). Perceiving anger and joy in speech through the size code. The 16th International Congress of Phonetic Sciences. ( pp.2105-2108).
• Xu, Y., Liu, F. (2007). Determining the temporal interval of segments with the help of F-0 contours. Journal of Phonetics 35, 398-420

2006

• Chen, Y., Xu, Y. (2006). Production of weak elements in speech - Evidence from F-o patterns of neutral tone in standard Chinese. Phonetica 63, 47-75
• Chuenwattanapranithi, S., Xu, Y., Thipakorn, B., Maneewongvatana, S. (2006). Expressing anger and joy with the size code. Speech Prosody 2006. ( pp.OS4-1_0090-). Dresden, Germany
• Gauthier, B., Shi, R., Xu, Y., Proulx, R. (2006). Modeling of infants' acquisition of tones in Mandarin using a non-supervised neural network. BRAIN COGNITION 60(3), 310-310
• Liu, F., Surendran, D., Xu, Y. (2006). Classification of statement and question intonations in Mandarin. Speech Prosody 2006. ( pp.PS5-25_023-). Dresden, Germany
• Prom-on, S., Xu, Y., Thipakorn, B. (2006). Quantitative target approximation model: Simulating underlying mechanisms of tones and intonations. 31st International Conference on Acoustics, Speech, and Signal Processing. ( pp.I-749-752). Toulouse, France
• Prom-on, S., Xu, Y., Thipakorn1, B. (2006). Functional-oriented articulatory modeling of tones and intonations. Speech Prosody 2006. ( pp.PS2-14_008-). Dresden, Germany
• Wang, B., Xu, Y. (2006). Prosodic encoding of topic and focus in Mandarin. Speech Prosody 2006. ( pp.PS3-12_017-). Dresden, Germany
• Xu, Y. (2006). Principles of tone research. Second International Symposium on Tonal Aspects of Languages. ( pp.3-13). La Rochelle, France
• Xu, Y. (2006). Speech prosody as articulated communicative functions. Speech Prosody 2006. ( pp.SPS5-4-218-). Dresden, Germany
• Xu, Y. (2006). Tone in connected discourse. In Brown, K. (Ed.). Encyclopedia of Language and Linguistics, Ed. (2nd ed. pp.742-750). Oxford Elsevier.
• Xu, Y., Liu, F. (2006). Tonal alignment, syllable structure and coarticulation: Toward an integrated model. Italian Journal of Linguistics 18, 125-159

2005

• Gauthier, B., Shi, R., Xu, Y. (2005). Recognising tones by tracking movements -- How infants may develop tonal categories from adult speech input. ISCA Workshop on Plasticity in Speech Perception.
• Gauthier, B., Shi, R., Xu, Y. (2005). Variable Input and the Discovery of Lexical Tones in Infants: A Connectionist Approach. Proceedings of BUCLD 30: The 30th annual Boston University conference on language development. ( pp.202-212). Boston, MA Cascadilla Press.
• Liu, F., Xu, Y. (2005). Parallel encoding of focus and interrogative meaning in mandarin intonation. Phonetica 62, 70-87 Author URL
• Surendran, D., Levow, G. -. A., Xu, Y. (2005). Tone Recognition in Mandarin using Focus. Interspeech 2005. ( pp.3301-3304). Lisbon, Portugal
• Xu, Y. (2005). Speech melody as articulatorily implemented communicative functions. Speech Communication 46(3-4), 220-251 doi:10.1016/j.specom.2005.02.014.
• Xu, Y., Xu, C. X. (2005). Phonetic realization of focus in English declarative intonation. Journal of Phonetics 33(2), 159-197 doi:10.1016/j.wocn.2004.11.001. Author URL

2004

• Xu, Y. (2004). Separation of functional components of tone and intonation from observed F0 patterns. In Fant, G., Fujisaki, H., Cao, J., Xu, Y. (Eds.). From Traditional Phonology to Modern Speech Processing: Festschrift for Professor Wu Zongji's 95th Birthday ( pp.483-505). Beijing Foreign Language Teaching and Research Press. Author URL
• Xu, Y. (2004). The PENTA model of speech melody: Transmitting multiple communicative functions in parallel. From Sound to Sense: 50+ years of discoveries in speech communication. ( pp.91-96). Cambridge, MA
• Xu, Y. (2004). Transmitting Tone and Intonation Simultaneously -- The Parallel Encoding and Target Approximation (PENTA) model. International Symposium on Tonal Aspects of Languages: With Emphasis on Tone Languages. ( pp.215-220). Beijing
• Xu, Y. (2004). Understanding tone from the perspective of production and perception. Language and Linguistics. Language and Linguistics 5, 757-797 Author URL
• Xu, Y., Larson, C. R., Bauer, J. J. A. H., T, C. (2004). Compensation for pitch-shifted auditory feedback during the production of Mandarin tone sequences. Journal of the Acoustical Society of America 116, 1168-1178 Author URL
• Xu, Y., Xu, C. X., Sun, X. (2004). On the Temporal Domain of Focus. International Conference on Speech Prosody 2004. ( pp.81-84). Nara, Japan Author URL

2003

• Liu, F., Xu, Y. (2003). Underlying targets of initial glides -- Evidence from focus-related F0 alignments in English. The 15th International Congress of Phonetic Sciences. ( pp.1887-1890). Barcelona Author URL
• Sheng, L., McGregor, K. K., Xu, Y. (2003). Prosodic and lexical-syntactic aspects of the therapeutic register. Clinical Linguistics and Phonetics 17, 355-363 Author URL
• Xu, C. X., Xu, Y. (2003). Effects of consonant aspiration on Mandarin tones. Journal of the International Phonetic Association 33, 165-181 Author URL
• Xu, Y. (2003). Three levels of tune-text relation. The 15th International Congress of Phonetic Sciences. ( pp.257-260). Barcelona

2002

• Sun, X., Xu, Y. (2002). Perceived Pitch of Synthesized Voice with Alternate Cycles. Journal of Voice 16, 443-459 Author URL
• Xu, Y. (2002). Articulatory constraints and tonal alignment. The 1st International Conference on Speech Prosody. ( pp.91-100). Aix-en-Provence
• Xu, Y., Liu, F. (2002). Segmentation of glides with tonal alignment as reference. The 7th Internatonal Conference on Spoken Language Processing. ( pp.1093-1096). Denver, Colorado Author URL
• Xu, Y., Sun, X. (2002). Maximum speed of pitch change and how it may relate to speech. Journal of the Acoustical Society of America 111, 1399-1413 Author URL

2001

• Xu, Y. (2001). Fundamental Frequency Peak Delay in Mandarin. Phonetica 58, 26-52 Author URL
• Xu, Y. (2001). Sources of tonal variations in connected speech. Journal of Chinese Linguistics 17, 1-31
• Xu, Y., Wang, Q. E. (2001). Pitch targets and their realization: Evidence from Mandarin Chinese. Speech Communication 33(4), 319-337 doi:10.1016/S0167-6393(00)00063-7. Author URL

2000

• Wang, E., R K Peach, X., Y, S., M, M., II, C. (2000). Perception of dynamic acoustic patterns by an individual with unilateral verbal auditory agnosia. Brain and Language 73, 442-455 Author URL
• Xu, Y., Sun, X. (2000). How fast can we really change pitch? Maximum speed of pitch change revisited. The 6th International Conference on Spoken Language Processing. ( pp.666-669). Beijing

1999

• Xu, C. X., Xu, Y., Luo, L. -. S. (1999). A pitch target approximation model for F0 contours in Mandarin. The 14th International Congress of Phonetic Sciences, San Francisco. ( pp.2359-2362).
• Xu, Y. (1999). Effects of tone and focus on the formation and alignment of f0contours. Journal of Phonetics 27, 55-105 Author URL
• Xu, Y. (1999). F0 peak delay: When, where and why it occurs. The 14th International Congress of Phonetic Sciences. ( pp.1881-1884). San Francisco
• Xu, Y. (1999). From simple pitch targets to complex f0 contours [in Chinese]. The 4th National Conference on Modern Phonetics. ( pp.92-97). Beijing

1998

• Xu, Y. (1998). Consistency of Tone-Syllable Alignment across Different Syllable Structures and Speaking Rates. Phonetica 55, 179-203 Author URL

1997

• Xu, Y. (1997). Contextual tonal variations in Mandarin. Journal of Phonetics 25, 61-83
• Xu, Y., Liberman, A. M., Whalen, D. H. (1997). On the Immediacy of Phonetic Perception. Psychological Science 8, 358-362
• Xu, Y., Wang, Q. E. (1997). What can tone studies tell us about intonation? Intonation: Theory, Models and Applications, Proceedings of an ESCA Workshop. European Speech Communication Association. ( pp.337-340). Athens, Greece

1996

• Xu, Y. (1996). Factors affecting the surface tonal contours of Mandarin [in Chinese]. The 3rd National Conference on Phonetics. ( pp.35-36). Beijing

1995

• Xu, Y. (1995). The effect of emphatic accent on contextual tonal variation. The XIII International Congress of Phonetic Sciences. ( pp.668-671). Stockholm

1994

• Mattingly, I. G., Xu, Y. (1994). Word superiority in Chinese. In Chang, H. -. W., Huang, J. T., Hue, C. -. W., Tzeng, O. J. L. (Eds.). Advances in the study of Chinese language processing, Volume 1 ( pp.101-111). Taipei Department of Psychology, National Taiwan University.
• Xu, Y. (1994). Asymmetry in contextual tonal variation in Mandarin. In H-W Chang, J. T. H., C-W Hue, O. J. L. T. (Eds.). Advances in the study of Chinese language processing, Volume 1 ( pp.383-396). Taipei Department of Psychology, National Taiwan University.
• Xu, Y. (1994). Production and perception of coarticulated tones. Journal of the Acoustical Society of America 95, 2240-2253 Author URL

1992

• Whalen, D. H., Xu, Y. (1992). Information for Mandarin Tones in the Amplitude Contour and in Brief Segments. Phonetica 49, 25-47 Author URL

1991

• Xu, Y. (1991). Depth of phonological recoding in short-term memory. Memory and Cognition 19, 263-273 Author URL

1989

• Xu, Y. (1989). Syllables and junctures [in Chinese]. In Wu, Z., Lin, M. (Eds.). A Course in Phonetics ( pp.193-220). Beijing Higher Education Press.

1988

• Yang, S. -. A., Xu, Y. (1988). An acoustic-phonetic oriented system for synthesizing Chinese. Speech Communication 7, 317-325

1987

• Yang, S. -. A., Xu, Y. (1987). A software system for synthesizing Chinese. 1987 International Conference on Chinese Information Processing. ( Vol. 2 pp.405-414). Beijing

1986

• Xu, Y. (1986). Acoustic-phonetic characteristics of juncture in Mandarin Chinese. Zhongguo Yuwen [Journal of Chinese Linguistics] (4), 353-360
• Xu, Y. (1986). The effect of frame size on the quality of synthesized speech. Proceedings of the 2nd Conference on Information Processing. Nanjing, China

1981

• Xu, Y. (1981). On the differences between American and British pronunciations. In A Collection of Prize Winning Papers at Shandong University ( ). Jinan, China Shandong University Press.