Research

PUBLICATIONS:

Journals

7. Iván López-Espejo, Zheng-Hua Tan and Jesper Jensen: “Improved External Speaker-Robust Keyword Spotting for Hearing Assistive Devices”. IEEE/ACM Transactions on Audio, Speech and Language Processing, vol. 28, pp. 1233-1247, April 2020. pdf_icon2

6. Juan M. Martín-Doñas, Antonio M. Peinado, Iván López-Espejo and Ángel M. Gómez: “Dual-Channel Speech Enhancement Based on Extended Kalman Filter Relative Transfer Function Estimation”. MDPI Applied Sciences, vol. 9, June 2019. pdf_icon2

5. Iván López-Espejo, Antonio M. Peinado, Ángel M. Gómez and José A. González: “Dual-Channel Spectral Weighting for Robust Speech Recognition in Mobile Devices”. Digital Signal Processing, vol. 75, pp. 13-24, April 2018. pdf_icon2

4. Iván López-Espejo, Antonio M. Peinado, Ángel M. Gómez and José A. González: “Dual-Channel VTS Feature Compensation for Noise-Robust Speech Recognition on Mobile Devices”. IET Signal Processing, vol. 11, pp. 17-25, February 2017. pdf_icon2

3. Iván López-Espejo, Antonio M. Peinado, Ángel M. Gómez and Juan M. Martín-Doñas: “Deep Neural Network-Based Noise Estimation for Robust ASR in Dual-Microphone Smartphones”. Lecture Notes in Artificial Intelligence, vol. 10077, pp. 117–127, November 2016. pdf_icon2  ppt_icon2

2. Nadir Benamirouche, Bachir Boudraa, Ángel M. Gómez, José L. Pérez-Córdoba and Iván López-Espejo: “A Dynamic FEC for Improved Robustness of CELP-Based Codec”. Lecture Notes in Artificial Intelligence, vol. 10077, pp. 14–23, November 2016. pdf_icon2

1. Iván López-Espejo, José A. González, Ángel M. Gómez and Antonio M. Peinado: “A Deep Neural Network Approach for Missing-Data Mask Estimation on Dual-Microphone Smartphones: Application to Noise-Robust Speech Recognition”. Lecture Notes in Artificial Intelligence, vol. 8854, pp. 119–128, November 2014. pdf_icon2  ppt_icon2

Conferences

13. Juan M. Martín-Doñas, Antonio M. Peinado, Iván López-Espejo and Ángel M. Gómez: “Dual-channel eKF-RTF Framework for Speech Enhancement with DNN-based Speech Presence Estimation”. Proc. IberSPEECH, Valladolid (Spain), March 2021.

12. Santi Prieto, Alfonso Ortega, Iván López-Espejo and Eduardo Lleida: “Shouted Speech Compensation for Speaker Verification Robust to Vocal Effort Conditions”. Proc. INTERSPEECH, Shanghai (China), October 2020. pdf_icon2

11. Iván López-Espejo, Zheng-Hua Tan and Jesper Jensen: “Exploring Filterbank Learning for Keyword Spotting”. Proc. EUSIPCO, Amsterdam (The Netherlands), January 2021. pdf_icon2  ppt_icon2  videoicon

10. Iván López-Espejo, Zheng-Hua Tan and Jesper Jensen: “Keyword Spotting for Hearing Assistive Devices Robust to External Speakers”. Proc. INTERSPEECH, Graz (Austria), September 2019. pdf_icon2  ppt_icon2

9. Iván López-Espejo, Santiago Prieto-Calero and Ana Iriarte-Ruiz: “X-Vector Speaker Verification System for NIST SRE 2018”. NIST SRE 2018 Evaluation Workshop, Athens (Greece), December 2018.

8. Juan M. Martín-Doñas, Iván López-Espejo, Ángel M. Gómez and Antonio M. Peinado: “A postfiltering approach for dual-microphone smartphones”. Proc. IberSPEECH, Barcelona (Spain), November 2018. pdf_icon2

7. Iván López-Espejo, Antonio M. Peinado, Ángel M. Gómez, José A. González and Santiago Prieto-Calero: “Dual-Channel VTS Feature Compensation with Improved Posterior Estimation”. Proc. EUSIPCO, Rome (Italy), September 2018. pdf_icon2  ppt_icon2

6. Juan M. Martín-Doñas, Iván López-Espejo, Ángel M. Gómez and Antonio M. Peinado: “An Extended Kalman Filter for RTF Estimation in Dual-Microphone Smartphones”. Proc. EUSIPCO, Rome (Italy), September 2018. pdf_icon2

5. Iván López-Espejo, Juan M. Martín-Doñas, Ángel M. Gómez and Antonio M. Peinado: “Unscented Transform-Based Dual-Channel Noise Estimation: Application to Speech Enhancement on Smartphones”. Proc. TSP, Athens (Greece), July 2018. pdf_icon2  ppt_icon2

4. Juan M. Martín-Doñas, Ángel M. Gómez, Iván López-Espejo and Antonio M. Peinado: “Dual-channel DNN-based Speech Enhancement for Smartphones”. Proc. MMSP, Luton (UK), October 2017. pdf_icon2

3. Juan M. Martín-Doñas, Iván López-Espejo, Carlos R. González-Lao, David Gallardo-Jiménez, Ángel M. Gómez, José L. Pérez-Córdoba, Victoria Sánchez, Juan A. Morales-Cordovilla and Antonio M. Peinado: “SecuVoice: A Spanish Speech Corpus for Secure Applications with Smartphones”. IberSPEECH, Lisbon (Portugal), November 2016. pdf_icon2  ppt_icon2

2. Iván López-Espejo, José A. González, Ángel M. Gómez and Antonio M. Peinado: “DNN-Based Missing-Data Mask Estimation for Noise-Robust ASR in Dual-Microphone Smartphones”. UKSpeech, Norwich (UK), July 2015. pdf_icon2  ppt_icon2

1. Iván López-Espejo, Ángel M. Gómez, José A. González and Antonio M. Peinado: “Feature Enhancement for Robust Speech Recognition on Smartphones with Dual-Microphone”. Proc. EUSIPCO, Lisbon (Portugal), September 2014. pdf_icon2  ppt_icon2

Book chapters

2. Jorge Bachs Rubio, Ángel M. Gómez García, Antonio M. Peinado Herreros and Iván López Espejo: “Humming Composer para Android”. Book of Final Degree Projects, Dept. of STTC, 2014.

1. José L. Carmona, Ángel M. Gómez, José A. González, Ján Koloda, Domingo López, Iván López-Espejo, Juan A. Morales-Cordovilla, Antonio M. Peinado, José L. Pérez-Córdoba and Victoria Sánchez Calle: “Estimación MMSE en Aplicaciones de Transmisión Multimedia”. Juan Antonio Morente Chiquero: In Memoriam, University of Granada Editorial, 2013.

Patents

1. Iván López-Espejo, Santiago Prieto Calero, Ana Iriarte Ruiz, David Roncal Redín, Miguel Á. Sánchez Yoldi and Eduardo Azanza Ladrón: “Authenticating a User”. WO 2020/007495 A1, January 2020. pdf_icon2

Others

1. Iván López-Espejo: “End-to-End Deep Residual Learning with Dilated Convolutions for Myocardial Infarction Detection and Localization”. arXiv:1909.12923, September 2019. pdf_icon2

DOCTORAL THESIS:

1. Robust Speech Recognition on Intelligent Mobile Devices with Dual-Microphone pdf_icon2  ppt_icon2  videoicon

CODES:

7. Multi-task deep residual learning for joint KWS and external speaker detection python_icon

6. Improved dual-channel vector Taylor series (VTS) feature compensation ml_icon

5. UT-based Dual-Channel Noise Estimator (2C-UTNE) ml_icon

4. Dual-channel Spectral Weighting (DSW) ml_icon

3. Dual-channel vector Taylor series (VTS) feature compensation ml_icon

2. Minimum Mean Square Noise (MMSN) ml_icon

1. Dual-Channel Spectral Subtraction (DCSS) ml_icon

MISCELLANY:

8. Tools to generate a noisy version of the Google Speech Commands Dataset v2. rar_icon

7. Setting up Kaldi with TensorFlow for speaker verification. pdf_icon2

6. Scientific presentation “Low-Resource Keyword Spotting for Hearing Assistive Devices”. pdf_icon2

5. Poster “Low-Resource Keyword Spotting for Hearing Assistive Devices”. pdf_icon2

4. Manually-annotated speaker gender labels for the Google Speech Commands Dataset v2. rar_icon

3. Speech database SecuVoice. rar_icon

2. Seminar “Robust ASR on Mobile Devices with Small Array”. pdf_icon2

1. Poster “Acoustic Noise Estimation for Robust Speech Recognition”. pdf_icon2