Akihiko Sugiyama — accepted AI-conference papers

2025

Advances in Microphone Array Processing and Multichannel Speech Enhancement

Gongping Huang, Jesper Rindom Jensen, Jingdong Chen, Jacob Benesty, Mads Græsbøll Christensen, Akihiko Sugiyama +2

ICASSP 2025accepted

This paper reviews pioneering works in microphone array processing and multichannel speech enhancement, highlighting historical achievements, technological evolution, commercialization aspects, and key challenges. It provides valuable insights into the progression and future direction of these areas…

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2023

Adaptive Noise Canceller Algorithm with SNR-Based Stepsize and Data-Dependent Averaging

Akihiko Sugiyama

ICASSP 2023accepted

This paper proposes an adaptive noise canceller algorithm with an SNR-based stepsize and data-dependent averaging. A first and a second SNR with different time constants for averaging are used one after the other to control the stepsize in adaptation. The time constants reflect the accuracy of the S…

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2023

Linear Microphone Array Parallel to the Driving Direction for in-Car Speech Enhancement

Masanori Tsujikawa, Akihiko Sugiyama, Ken Hanazawa, Yoshinobu Kajikawa

ICASSP 2023accepted

This paper proposes a linear microphone array parallel to the driving direction for in-car speech enhancement. In contrast to other linear microphone arrays in the car cabin reported in a literature or implemented as a commercial product, the array axis is arranged in parallel to the driving directi…

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2022

Robust Adaptive Noise Canceller Algorithm with Snr-Based Stepsize Control and Noise-Path Gain Compensation

Akihiko Sugiyama

ICASSP 2022accepted

This paper proposes a robust adaptive noise canceller algorithm with SNR-based stepsize control and noise-path gain compensation. The stepsize for coefficient adaptation is controlled with an estimated SNR for low distortion of the output signal and a small residual noise. A second SNR estimate, whi…

Cited by 3 Source ↗Scholar ↗

2020

Fast Start-Up Algorithm for Adaptive Noise Cancellers with Novel SNR Estimation and Stepsize Control

Akihiko Sugiyama

ICASSP 2020accepted

This paper proposes a fast convergence algorithm for adaptive noise cancellers with novel SNR (signal-to-noise ratio) estimation and stepsize control. The stepsize for coefficient adaptation is controlled with an estimated SNR for low distortion of the output signal and a small residual noise. A fir…

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2019

A Noise Robust Hearable Device with an Adaptive Noise Canceller and Its DSP Implementation

Akihiko Sugiyama, Ryoji Miyahara, Kouji Oosugi

ICASSP 2019accepted

This paper presents a noise-robust hearable device with an adaptive noise canceller. The hearable device has an inner-ear and an outer-ear microphone to collect ear-canal speech signal and the outer-ear environmental signal, respectively. The environmental signal drives an adaptive filter to generat…

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2018

Adaptive Noise Canceller with Snr Estimate Switchover for Stepsize Control

Akihiko Sugiyama

ICASSP 2018accepted

This paper proposes an adaptive noise canceller with SNR estimate switchover for stepsize control. The SNR estimate is switched from a first estimate to a second one when the latter takes a smaller value than the former. The first estimate is a power ratio of the primary and the reference input sign…

Cited by 3 Source ↗Scholar ↗

2017

Automatic gain control with integrated signal enhancement for specified target and background-noise levels

Akihiko Sugiyama, Ryoji Miyahara

ICASSP 2017accepted

This paper proposes automatic gain control with integrated signal enhancement for specified target and background-noise levels. The input signal is separated into a target signal and background noise by signal enhancement. The processing gains for the target and the noise are calculated from their e…

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2017

Diagonal microphone placement for the landscape/portrait interchangeable mode of a personal computer

Ryoji Miyahara, Akihiko Sugiyama

ICASSP 2017accepted

This paper proposes diagonal microphone placement for the landscape/portrait interchangeable mode of a personal computer. Two microphones are diagonally located at a screen corner to provide useful directivity for target-signal enhancement in both landscape and portrait modes. The diagonal microphon…

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2016

Gain relaxation: A useful technique for signal enhancement with an unaware local noise source targeted at speech recognition

Ryoji Miyahara, Akihiko Sugiyama

ICASSP 2016accepted

This paper proposes gain relaxation in signal enhancement designed for speech recognition with an unaware local noise source. An attention is drawn to a new performance degradation problem in signal enhancement combined with automatic speech recognition (ASR), which is encountered in real products w…

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2015

A directional noise suppressor with a specified beamwidth

Akihiko Sugiyama, Ryoji Miyahara

ICASSP 2015accepted

this paper proposes a directional noise suppressor with a specified constant beamwidth. A directional gain is calculated based on interchannel phase difference and combined with a spectral gain commonly used in single-channelnoise suppressors (NSs). The beamwidth can be specified as passband edges o…

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