Stable Implementation of Zero Frequency Filtering of Speech Signals for Efficient Epoch Extraction

• Published in: IEEE signal processing letters 2019-09, Vol.26 (9), p.1310-1314
• Main Authors: Gurugubelli, Krishna, Vuppala, Anil Kumar
• Format: Article
• Language: English
• Subjects: False alarms; Frequency filters; Glottal closure instants; Identification methods; linear phase; Phase distortion; Resonant frequency; Speech; Speech processing; stability; Stability analysis; Time-frequency analysis; Transfer functions; zero frequency filtering; zero phase
• ISSN: 1070-9908; 1558-2361
• DOI: 10.1109/LSP.2019.2929442

Epochs are the abrupt-closure events in vocal fold vibration during the production of voiced speech. Zero frequency filtering is a simple and effective technique used to estimate the glottal closure instants accurately from the speech signal. However, the zero frequency filter is an unstable system. Hence, it may not be suitable for practical implementation due to the requirements of high precision computation. In this letter, zero-phase zero frequency resonator is proposed as an alternative to zero frequency filter. The proposed approach provides a stable zero-phase response. The experimental results indicate that the performance of the proposed method outperformed the state-of-the-art methods in terms of identification rate 99.17% and provides comparable performance in terms of false alarm rate (0.41%), and identification accuracy (0.28 ms).