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Non-reference speech quality models are important for a growing number of applications. The VoiceMOS 2022 challenge provided a dataset of synthetic voice conversion and text-to-speech samples with subjective labels. This study looks at the…

Sound · Computer Science 2022-09-15 Michael Chinen , Jan Skoglund , Chandan K A Reddy , Alessandro Ragano , Andrew Hines

The objective speech quality assessment is usually conducted by comparing received speech signal with its clean reference, while human beings are capable of evaluating the speech quality without any reference, such as in the mean opinion…

Audio and Speech Processing · Electrical Eng. & Systems 2021-04-06 Meng Yu , Chunlei Zhang , Yong Xu , Shixiong Zhang , Dong Yu

Designing a speech quality assessment (SQA) system for estimating mean-opinion-score (MOS) of multi-rate speech with varying sampling frequency (16-48 kHz) is a challenging task. The challenge arises due to the limited availability of a…

Audio and Speech Processing · Electrical Eng. & Systems 2026-02-17 Fengyuan Cao , Xinyu Liang , Fredrik Cumlin , Victor Ungureanu , Chandan K. A. Reddy , Christian Schuldt , Saikat Chatterjee

We present the second edition of the VoiceMOS Challenge, a scientific event that aims to promote the study of automatic prediction of the mean opinion score (MOS) of synthesized and processed speech. This year, we emphasize real-world and…

Audio and Speech Processing · Electrical Eng. & Systems 2023-10-10 Erica Cooper , Wen-Chin Huang , Yu Tsao , Hsin-Min Wang , Tomoki Toda , Junichi Yamagishi

Although recent neural text-to-speech (TTS) systems have achieved high-quality speech synthesis, there are cases where a TTS system generates low-quality speech, mainly caused by limited training data or information loss during knowledge…

Audio and Speech Processing · Electrical Eng. & Systems 2022-05-26 Yeunju Choi , Youngmoon Jung , Youngjoo Suh , Hoirin Kim

Speech quality assessment has been a critical issue in speech processing for decades. Existing automatic evaluations usually require clean references or parallel ground truth data, which is infeasible when the amount of data soars.…

Audio and Speech Processing · Electrical Eng. & Systems 2021-09-21 Wei-Cheng Tseng , Chien-yu Huang , Wei-Tsung Kao , Yist Y. Lin , Hung-yi Lee

The acoustic environment can degrade speech quality during communication (e.g., video call, remote presentation, outside voice recording), and its impact is often unknown. Objective metrics for speech quality have proven challenging to…

Audio and Speech Processing · Electrical Eng. & Systems 2022-06-30 Karl El Hajal , Milos Cernak , Pablo Mainar

Mean opinion score (MOS) is a popular subjective metric to assess the quality of synthesized speech, and usually involves multiple human judges to evaluate each speech utterance. To reduce the labor cost in MOS test, multiple methods have…

Sound · Computer Science 2021-03-02 Yichong Leng , Xu Tan , Sheng Zhao , Frank Soong , Xiang-Yang Li , Tao Qin

The automatic speech quality assessment (SQA) has been extensively studied to predict the speech quality without time-consuming questionnaires. Recently, neural-based SQA models have been actively developed for speech samples produced by…

Sound · Computer Science 2025-06-24 Yuto Kondo , Hirokazu Kameoka , Kou Tanaka , Takuhiro Kaneko

Assessing the perceptual quality of synthetic speech is crucial for guiding the development and refinement of speech generation models. However, it has traditionally relied on human subjective ratings such as the Mean Opinion Score (MOS),…

The ground truth used for training image, video, or speech quality prediction models is based on the Mean Opinion Scores (MOS) obtained from subjective experiments. Usually, it is necessary to conduct multiple experiments, mostly with…

Audio and Speech Processing · Electrical Eng. & Systems 2021-12-15 Gabriel Mittag , Saman Zadtootaghaj , Thilo Michael , Babak Naderi , Sebastian Möller

Self-supervised learning (SSL) models like Wav2Vec2, HuBERT, and WavLM have been widely used in speech processing. These transformer-based models consist of multiple layers, each capturing different levels of representation. While prior…

Audio and Speech Processing · Electrical Eng. & Systems 2025-08-13 Xinyu Liang , Fredrik Cumlin , Victor Ungureanu , Chandan K. A. Reddy , Christian Schuldt , Saikat Chatterjee

Mean Opinion Score (MOS) is a popular measure for evaluating synthesized speech. However, the scores obtained in MOS tests are heavily dependent upon many contextual factors. One such factor is the overall range of quality of the samples…

Audio and Speech Processing · Electrical Eng. & Systems 2023-10-10 Erica Cooper , Junichi Yamagishi

Speech quality in online conferencing applications is typically assessed through human judgements in the form of the mean opinion score (MOS) metric. Since such a labor-intensive approach is not feasible for large-scale speech quality…

Audio and Speech Processing · Electrical Eng. & Systems 2022-10-04 Bastiaan Tamm , Helena Balabin , Rik Vandenberghe , Hugo Van hamme

Automatic speech quality assessment is essential for audio researchers, developers, speech and language pathologists, and system quality engineers. The current state-of-the-art systems are based on framewise speech features (hand-engineered…

Audio and Speech Processing · Electrical Eng. & Systems 2022-11-15 Karl El Hajal , Zihan Wu , Neil Scheidwasser-Clow , Gasser Elbanna , Milos Cernak

As a subjective metric to evaluate the quality of synthesized speech, Mean opinion score~(MOS) usually requires multiple annotators to score the same speech. Such an annotation approach requires a lot of manpower and is also time-consuming.…

Sound · Computer Science 2023-06-21 Kexin Wang , Yunlong Zhao , Qianqian Dong , Tom Ko , Mingxuan Wang

We present our system (denoted as T05) for the VoiceMOS Challenge (VMC) 2024. Our system was designed for the VMC 2024 Track 1, which focused on the accurate prediction of naturalness mean opinion score (MOS) for high-quality synthetic…

Sound · Computer Science 2024-09-17 Kaito Baba , Wataru Nakata , Yuki Saito , Hiroshi Saruwatari

Speech quality assessment (SQA) aims to evaluate the quality of speech samples without relying on time-consuming listener questionnaires. Recent efforts have focused on training neural-based SQA models to predict the mean opinion score…

Sound · Computer Science 2025-06-24 Yuto Kondo , Hirokazu Kameoka , Kou Tanaka , Takuhiro Kaneko

Non-intrusive speech quality assessment is a crucial operation in multimedia applications. The scarcity of annotated data and the lack of a reference signal represent some of the main challenges for designing efficient quality assessment…

Audio and Speech Processing · Electrical Eng. & Systems 2021-08-20 Alessandro Ragano , Emmanouil Benetos , Andrew Hines

Human subjective evaluation is the gold standard to evaluate speech quality optimized for human perception. Perceptual objective metrics serve as a proxy for subjective scores. The conventional and widely used metrics require a reference…

Sound · Computer Science 2021-02-12 Chandan K A Reddy , Vishak Gopal , Ross Cutler