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Code-switching automatic speech recognition (CS-ASR) presents unique challenges due to language confusion introduced by spontaneous intra-sentence switching and accent bias that blurs the phonetic boundaries. Although the constituent…

Audio and Speech Processing · Electrical Eng. & Systems 2026-03-18 Hexin Liu , Haoyang Zhang , Qiquan Zhang , Xiangyu Zhang , Dongyuan Shi , Eng Siong Chng , Haizhou Li

Recently, the acoustic-to-word model based on the Connectionist Temporal Classification (CTC) criterion was shown as a natural end-to-end model directly targeting words as output units. However, this type of word-based CTC model suffers…

Computation and Language · Computer Science 2017-11-29 Jinyu Li , Guoli Ye , Rui Zhao , Jasha Droppo , Yifan Gong

Recently, there has been growing interest in multi-speaker speech recognition, where the utterances of multiple speakers are recognized from their mixture. Promising techniques have been proposed for this task, but earlier works have…

Sound · Computer Science 2018-05-16 Hiroshi Seki , Takaaki Hori , Shinji Watanabe , Jonathan Le Roux , John R. Hershey

Learning an effective speaker representation is crucial for achieving reliable performance in speaker verification tasks. Speech signals are high-dimensional, long, and variable-length sequences containing diverse information at each…

Audio and Speech Processing · Electrical Eng. & Systems 2023-08-25 Wei Xia , John H. L. Hansen

Connectionist temporal classification (CTC) -based models are attractive because of their fast inference in automatic speech recognition (ASR). Language model (LM) integration approaches such as shallow fusion and rescoring can improve the…

Computation and Language · Computer Science 2022-09-07 Hayato Futami , Hirofumi Inaguma , Masato Mimura , Shinsuke Sakai , Tatsuya Kawahara

Recognizing overlapping speech from multiple speakers in conversational scenarios is one of the most challenging problem for automatic speech recognition (ASR). Serialized output training (SOT) is a classic method to address multi-talker…

Audio and Speech Processing · Electrical Eng. & Systems 2024-09-02 Mohan Shi , Zengrui Jin , Yaoxun Xu , Yong Xu , Shi-Xiong Zhang , Kun Wei , Yiwen Shao , Chunlei Zhang , Dong Yu

Transformer encoder with connectionist temporal classification (CTC) framework is widely used for automatic speech recognition (ASR). However, knowledge distillation (KD) for ASR displays a problem of disagreement between teacher-student…

Audio and Speech Processing · Electrical Eng. & Systems 2024-06-13 Eungbeom Kim , Hantae Kim , Kyogu Lee

Most approaches to multi-talker overlapped speech separation and recognition assume that the number of simultaneously active speakers is given, but in realistic situations, it is typically unknown. To cope with this, we extend an iterative…

Audio and Speech Processing · Electrical Eng. & Systems 2020-12-22 Thilo von Neumann , Christoph Boeddeker , Lukas Drude , Keisuke Kinoshita , Marc Delcroix , Tomohiro Nakatani , Reinhold Haeb-Umbach

Large Language Models (LLMs) are strong decoders for Serialized Output Training (SOT) in two-talker Automatic Speech Recognition (ASR), yet their performance degrades substantially in challenging conditions such as three-talker mixtures. A…

Sound · Computer Science 2026-03-31 Hao Shi , Yuan Gao , Xugang Lu , Tatsuya Kawahara

Most existing sequence labelling models rely on a fixed decomposition of a target sequence into a sequence of basic units. These methods suffer from two major drawbacks: 1) the set of basic units is fixed, such as the set of words,…

Computation and Language · Computer Science 2017-08-15 Hairong Liu , Zhenyao Zhu , Xiangang Li , Sanjeev Satheesh

Knowledge distillation has been widely used to compress existing deep learning models while preserving the performance on a wide range of applications. In the specific context of Automatic Speech Recognition (ASR), distillation from…

Machine Learning · Computer Science 2021-07-06 Yan Gao , Titouan Parcollet , Nicholas Lane

Cued Speech (CS) is a visual communication system for the deaf or hearing impaired people. It combines lip movements with hand cues to obtain a complete phonetic repertoire. Current deep learning based methods on automatic CS recognition…

Multimedia · Computer Science 2021-06-28 Jianrong Wang , Ziyue Tang , Xuewei Li , Mei Yu , Qiang Fang , Li Liu

Conventional automatic speech recognition (ASR) systems trained from frame-level alignments can easily leverage posterior fusion to improve ASR accuracy and build a better single model with knowledge distillation. End-to-end ASR systems…

Computation and Language · Computer Science 2019-07-03 Gakuto Kurata , Kartik Audhkhasi

In this paper we demonstrate continuous noisy speech recognition using connectionist temporal classification (CTC) model on limited Chinese vocabulary using electroencephalography (EEG) features with no speech signal as input and we further…

Audio and Speech Processing · Electrical Eng. & Systems 2020-03-02 Gautam Krishna , Co Tran , Yan Han , Mason Carnahan , Ahmed H Tewfik

Connectionist temporal classification (CTC) provides an end-to-end acoustic model (AM) training strategy. CTC learns accurate AMs without time-aligned phonetic transcription, but sometimes fails to converge, especially in…

Audio and Speech Processing · Electrical Eng. & Systems 2019-02-28 Di He , Xuesong Yang , Boon Pang Lim , Yi Liang , Mark Hasegawa-Johnson , Deming Chen

The gap between speech and text modalities is a major challenge in speech-to-text translation (ST). Different methods have been proposed to reduce this gap, but most of them require architectural changes in ST training. In this work, we…

Computation and Language · Computer Science 2023-06-06 Phuong-Hang Le , Hongyu Gong , Changhan Wang , Juan Pino , Benjamin Lecouteux , Didier Schwab

Recent works in speech recognition rely either on connectionist temporal classification (CTC) or sequence-to-sequence models for character-level recognition. CTC assumes conditional independence of individual characters, whereas…

Computer Vision and Pattern Recognition · Computer Science 2018-10-02 Stavros Petridis , Themos Stafylakis , Pingchuan Ma , Georgios Tzimiropoulos , Maja Pantic

Training automatic speech recognition (ASR) systems requires large amounts of data in the target language in order to achieve good performance. Whereas large training corpora are readily available for languages like English, there exists a…

Audio and Speech Processing · Electrical Eng. & Systems 2017-11-15 Markus Müller , Sebastian Stüker , Alex Waibel

Target-speaker speech recognition aims to recognize target-speaker speech from noisy environments with background noise and interfering speakers. This work presents a joint framework that combines time-domain target-speaker speech…

Sound · Computer Science 2021-03-01 Jiatong Shi , Chunlei Zhang , Chao Weng , Shinji Watanabe , Meng Yu , Dong Yu

Accented speech remains a persistent challenge for automatic speech recognition (ASR), as most models are trained on data dominated by a few high-resource English varieties, leading to substantial performance degradation for other accents.…

Computation and Language · Computer Science 2026-02-03 Wonjun Lee , Hyounghun Kim , Gary Geunbae Lee