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Hayato Futami

11 accepted papers

2026

PHONOLOGICAL TOKENIZER: PROSODY-AWARE PHONETIC TOKEN VIA MULTI-OBJECTIVE FINE-TUNING WITH DIFFERENTIABLE K-MEANS

ICASSP 2026poster

In recent years, there has been growing interest in representing speech with discrete tokens, which serve as pseudo-text for speech language models (speechLMs) and as efficient intermediate representations for downstream tasks. These tokens are typically categorized as acoustic and phonetic tokens:…

Cited by 0SourcePDFScholar
2025

ESPnet-SDS: Unified Toolkit and Demo for Spoken Dialogue Systems

NAACL 2025system demonstrations

Advancements in audio foundation models (FMs) have fueled interest in end-to-end (E2E) spoken dialogue systems, but different web interfaces for each system makes it challenging to compare and contrast them effectively. Motivated by this, we introduce an open-source, user-friendly toolkit designed t…

2025

Exploring Context Strategies in LLMs for Discourse-Aware Machine Translation

EMNLP 2025

While large language models (LLMs) excel at machine translation (MT), the impact of how LLMs utilize different forms of contextual information on discourse-level phenomena remains underexplored. We systematically investigate how different forms of context such as prior source sentences, models’ gene

2025

Hypothesis Clustering and Merging: Novel MultiTalker Speech Recognition with Speaker Tokens

ICASSP 2025accepted

In many real-world scenarios, such as meetings, multiple speakers are present with an unknown number of participants, and their utterances often overlap. We address these multi-speaker challenges by a novel attention-based encoder-decoder method augmented with special speaker class tokens obtained b…

Cited by 0SourceScholar
2024

Phoneme-Aware Encoding for Prefix-Tree-Based Contextual ASR

ICASSP 2024accepted

In speech recognition applications, it is important to recognize context-specific rare words, such as proper nouns. Tree-constrained Pointer Generator (TCPGen) has shown promise for this purpose, which efficiently biases such words with a prefix tree. While the original TCPGen relies on grapheme-bas…

Cited by 0SourceScholar
2024

UniverSLU: Universal Spoken Language Understanding for Diverse Tasks with Natural Language Instructions

NAACL 2024long

Recent studies leverage large language models with multi-tasking capabilities, using natural language prompts to guide the model’s behavior and surpassing performance of task-specific models. Motivated by this, we ask: can we build a single model that jointly performs various spoken language underst…

2023

A Study on the Integration of Pipeline and E2E SLU Systems for Spoken Semantic Parsing Toward Stop Quality Challenge

ICASSP 2023accepted

Recently there have been efforts to introduce new benchmark tasks for spoken language understanding (SLU), like semantic parsing. In this paper, we describe our proposed spoken semantic parsing system for the quality track (Track 1) in Spoken Language Understanding Grand Challenge which is part of I…

Cited by 0SourceScholar
2023

E-Branchformer-Based E2E SLU Toward Stop on-Device Challenge

ICASSP 2023accepted

In this paper, we report our team’s study on track 2 of the Spoken Language Understanding Grand Challenge, which is a component of the ICASSP Signal Processing Grand Challenge 2023. The task is intended for on-device processing and involves estimating semantic parse labels from speech using a model…

Cited by 0SourceScholar
2023

Joint Modelling of Spoken Language Understanding Tasks with Integrated Dialog History

ICASSP 2023accepted

Most human interactions occur in the form of spoken conversations where the semantic meaning of a given utterance depends on the context. Each utterance in spoken conversation can be represented by many semantic and speaker attributes, and there has been an interest in building Spoken Language Under…

Cited by 0SourceScholar
2023

Streaming Joint Speech Recognition and Disfluency Detection

ICASSP 2023accepted

Disfluency detection has mainly been solved in a pipeline approach, as post-processing of speech recognition. In this study, we propose Transformer-based encoder-decoder models that jointly solve speech recognition and disfluency detection, which work in a streaming manner. Compared to pipeline appr…

Cited by 0SourceScholar
2023

The Pipeline System of ASR and NLU with MLM-based data Augmentation Toward Stop Low-Resource Challenge

ICASSP 2023accepted

This paper describes our system for the low-resource domain adaptation track (Track 3) in Spoken Language Understanding Grand Challenge, which is a part of ICASSP Signal Processing Grand Challenge 2023. In the track, we adopt a pipeline approach of ASR and NLU. For ASR, we fine-tune Whisper for each…

Cited by 0SourceScholar