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We propose a general framework to compute the word error rate (WER) of ASR systems that process recordings containing multiple speakers at their input and that produce multiple output word sequences (MIMO). Such ASR systems are typically…

Audio and Speech Processing · Electrical Eng. & Systems 2023-07-24 Thilo von Neumann , Christoph Boeddeker , Keisuke Kinoshita , Marc Delcroix , Reinhold Haeb-Umbach

The Word Error Rate (WER) is the common measure of accuracy for Automatic Speech Recognition (ASR). Transcripts are usually pre-processed by substituting specific characters to account for non-semantic differences. As a result of this…

Computation and Language · Computer Science 2024-09-20 Korbinian Kuhn , Verena Kersken , Gottfried Zimmermann

Evaluating automatic speech recognition (ASR) systems is a classical but difficult and still open problem, which often boils down to focusing only on the word error rate (WER). However, this metric suffers from many limitations and does not…

Computation and Language · Computer Science 2026-05-01 Thibault Bañeras-Roux , Mickaël Rouvier , Jane Wottawa , Richard Dufour

Automatic speech recognition (ASR) systems are predominantly evaluated using the Word Error Rate (WER). However, raw token-level metrics fail to capture semantic fidelity and routinely obscures the `diversity tax', the disproportionate…

Machine Learning · Computer Science 2026-03-06 Ting-Hui Cheng , Line H. Clemmensen , Sneha Das

Recent years have witnessed remarkable progress in automatic speech recognition (ASR), driven by advances in model architectures and large-scale training data. However, two important aspects remain underexplored. First, Word Error Rate…

Computation and Language · Computer Science 2026-04-15 Peng Wang , Yanqiao Zhu , Zixuan Jiang , Qinyuan Chen , Xingjian Zhao , Xipeng Qiu , Wupeng Wang , Zhifu Gao , Xiangang Li , Kai Yu , Xie Chen

Automatic speech recognition (ASR) systems have traditionally been evaluated using English datasets, with the word error rate (WER) serving as the predominant metric. WER's simplicity and ease of interpretation have contributed to its…

Computation and Language · Computer Science 2024-10-21 Thennal D K , Jesin James , Deepa P Gopinath , Muhammed Ashraf K

Text encodings from automatic speech recognition (ASR) transcripts and audio representations have shown promise in speech emotion recognition (SER) ever since. Yet, it is challenging to explain the effect of each information stream on the…

Many studies have examined the shortcomings of word error rate (WER) as an evaluation metric for automatic speech recognition (ASR) systems. Since WER considers only literal word-level correctness, new evaluation metrics based on semantic…

Computation and Language · Computer Science 2023-12-04 Zitha Sasindran , Harsha Yelchuri , T. V. Prabhakar , Supreeth Rao

While Automatic Speech Recognition (ASR) is typically benchmarked by word error rate (WER), real-world applications ultimately hinge on semantic fidelity. This mismatch is particularly problematic for dysarthric speech, where articulatory…

Audio and Speech Processing · Electrical Eng. & Systems 2026-01-30 Xiuwen Zheng , Sixun Dong , Bornali Phukon , Mark Hasegawa-Johnson , Chang D. Yoo

The word error rate (WER) of an automatic speech recognition (ASR) system increases when a mismatch occurs between the training and the testing conditions due to the noise, etc. In this case, the acoustic information can be less reliable.…

Computation and Language · Computer Science 2020-11-03 Dominique Fohr , Irina Illina

As Automatic Speech Recognition (ASR) is increasingly deployed in clinical dialogue, standard evaluations still rely heavily on Word Error Rate (WER). This paper challenges that standard, investigating whether WER or other common metrics…

Computation and Language · Computer Science 2026-01-21 Zachary Ellis , Jared Joselowitz , Yash Deo , Yajie He , Anna Kalygina , Aisling Higham , Mana Rahimzadeh , Yan Jia , Ibrahim Habli , Ernest Lim

This paper addresses the problem of automatic speech recognition (ASR) error detection and their use for improving spoken language understanding (SLU) systems. In this study, the SLU task consists in automatically extracting, from ASR…

Computation and Language · Computer Science 2017-05-29 Edwin Simonnet , Sahar Ghannay , Nathalie Camelin , Yannick Estève , Renato De Mori

Reverberation negatively impacts the performance of automatic speech recognition (ASR). Prior work on quantifying the effect of reverberation has shown that clarity (C50), a parameter that can be estimated from the acoustic impulse…

Audio and Speech Processing · Electrical Eng. & Systems 2020-02-17 Hannes Gamper , Dimitra Emmanouilidou , Sebastian Braun , Ivan J. Tashev

Text data is commonly utilized as a primary input to enhance Speech Emotion Recognition (SER) performance and reliability. However, the reliance on human-transcribed text in most studies impedes the development of practical SER systems,…

Audio and Speech Processing · Electrical Eng. & Systems 2025-03-25 Yuanchao Li , Peter Bell , Catherine Lai

Traditional ASR metrics like WER and CER fail to capture intelligibility, especially for dysarthric and dysphonic speech, where semantic alignment matters more than exact word matches. ASR systems struggle with these speech types, often…

Machine Learning · Computer Science 2025-12-12 Bornali Phukon , Xiuwen Zheng , Mark Hasegawa-Johnson

The performances of automatic speech recognition (ASR) systems are usually evaluated by the metric word error rate (WER) when the manually transcribed data are provided, which are, however, expensively available in the real scenario. In…

Computation and Language · Computer Science 2020-09-01 Kai Fan , Jiayi Wang , Bo Li , Shiliang Zhang , Boxing Chen , Niyu Ge , Zhijie Yan

Nowadays, speech is becoming a more common, if not standard, interface to technology. This can be seen in the trend of technology changes over the years. Increasingly, voice is used to control programs, appliances and personal devices…

Human-Computer Interaction · Computer Science 2019-09-10 Abraham Glasser

Word error rate (WER) as a metric has a variety of limitations that have plagued the field of speech recognition. Evaluation datasets suffer from varying style, formality, and inherent ambiguity of the transcription task. In this work, we…

This paper addresses automatic quality assessment of spoken language translation (SLT). This relatively new task is defined and formalized as a sequence labeling problem where each word in the SLT hypothesis is tagged as good or bad…

Computation and Language · Computer Science 2016-10-02 Ngoc-Tien Le , Benjamin Lecouteux , Laurent Besacier

Although automatic speech recognition (ASR) task has gained remarkable success by sequence-to-sequence models, there are two main mismatches between its training and testing that might lead to performance degradation: 1) The typically used…

Computation and Language · Computer Science 2022-04-14 Chen Chen , Yuchen Hu , Nana Hou , Xiaofeng Qi , Heqing Zou , Eng Siong Chng