• The Journal of the Acoustical Society of Korea
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• v.40 no.6
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• pp.678-682
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• 2021

Reverberation Time (RT) with noise levels can affect speech recognition ability in a listening environment. The degree of influence may depend on reverberation times and modes of binaural hearing. In this study, Korean monosyllabic Word Recognition Scores (WRS) were investigated in 10 young normal hearing subjects under binaural conditions. The RT of 3.4 s and signal to noise ratio of 0 dB were used at 55 dB HL for diotic (noise with the same phase) and dichotic (noise with the fixed phase difference, π) conditions. The improvement in WRS was noted in dichotic hearing (p < 0.05) while the similar trend was not observed in diotic hearing. This data may be useful in analyzing psychoacoustic effects of RTs under noisy conditions.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.771-774
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• 2000

디지털 워터마킹은 오디오, 이미지, 영상과 같은 고품질 디지털 멀티미디어 컨텐츠의 불법적인 복제와 유통을 막고 저작권을 보호하기 위한 최후의 방어 수단으로 인식되고 있는 신호처리 기술이다. 오디오 신호에 삽입되는 워터마크 신호는 들리지 않아야 하는 특성과 함께, 압축이나 필터링과 같은 신호처리 과정 후에도 추출이 가능한 강인성을 지녀야 한다 본 연구에서는 현재 제안되고 있는 여러가지 오디오 워터마킹 방법 중에서 대역확산을 기반으로 한 PN 시퀸스 오디오 워터마킹 시스템에 대해서 다루었다. 삽입된 워터마크 신호가 들리지 않도록 하기 위해 인간의 청각 시스템에 기반한 심리음향모델을 적용하였으며, 효율적인 검출과 청각상의 특성을 고려한 여러 가지 실험을 수행하였다. 워터마크 정보의 검출에 있어서는 원 신호가 필요하지 않은Blind Detection 방법을 제안하여 효율적인 워터마킹 시스템을 구현할 수 있도록 하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.05a
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• pp.83-86
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• 2009

음 배리어 프리(acoustic barrier-free)는 '음과 관련하여 장애인과 고령자의 생활에 불편을 주는 장벽을 제거하는 방안'이라고 정의 된다. 음 배리어프리는 건축, 도시 공간 및 교통 수단에서의 시각 또는 청각약자를 위한 안내, 유도, 경보 및 피난 시설에 대한 설계와 관련된다. 또한 보청기 등의 청각지원기기, 전자기기 등의 신호음 및 안내음과 음성 전송 장치와 같은 제품 디자인에도 음 배리어프리 개념은 요구된다. 본고에는 일본사례를 중심으로 음 배리어프리의 현황을 소개하고자 한다.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.33 no.3
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• pp.183-187
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• 2022

Dysphonia is well known as one of the otolaryngological symptoms of coronavirus disease 2019 (COVID-19) infection. The vocal changes of the COVID-19 condition have been reported in terms of parameters of multi-dimensional voice assessment, including acoustic analysis, auditory-perceptual evaluation, and psychometric assessment. However, there has not been a daily followup study in patients with acute COVID-19 infection. In this study, a 41-year-old male performed daily voice recordings of vowel phonation and passage-reading tasks during the self-quarantine period of one week. Compared to the normal voice status of the prepandemic period, voice abnormalities peaked on day two after the diagnosis of COVID-19 infection and recovered after one week.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.1004-1007
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• 2020

본 논문에서는 청각 장애인이 가정에서 듣지 못해 발생하는 낭비와 위험을 미리 예방하기 위하여 가정에서 현재 발생하고 있는 소리를 알려주는 시스템을 구현하였다. 무지향성 마이크로 일상 소리 감지 후 음향 데이터에서 Mel-Spectogram 특징 벡터를 추출하여 Convolutional Neural Network(CNN) 모델의 Resnet 알고리즘을 진행한다. 서버에서 소리에 대한 분석을 진행한 후 그 결과를 안드로이드에서 실시간으로 5 초마다 확인하여 사용자에게 알림 서비스를 제공한다. 이를 통해 낭비를 줄이고 위험에 대처할 수 있게 한다. 청각 장애인의 소리에 대한 접근성을 다양한 측면으로 고려해야 한다는 사회적 인식을 확산시키고자 한다.

• Phonetics and Speech Sciences
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• v.14 no.2
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• pp.55-65
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• 2022

This study aimed to compare acoustic measurements by the high, middle, and low laryngeal heights of male musical theater students. Furthermore, the correlation between the relative height of the larynx and the acoustic measurements was examined, along with the predictability of the relative height (vertical position) of the larynx from acoustic measurements. The participants included five male students majoring in musical theater singing, and acoustic analysis was performed by having them produce the /a/ vowel 10 times each at the laryngeal positions of high, middle, and low. The relative vertical positions of the laryngeal prominence in each position were measured based on the resting position. Results indicated that the relative position of the larynx varied significantly according to laryngeal height, such that as the larynx descended, the first three formant frequencies decreased while the spectral energy at the same frequencies increased. Formant frequencies showed a weak to moderate positive correlation with the relative height of the larynx, while the spectral energy showed a moderate negative correlation. The relative height of the larynx was predicted by eight acoustic measures (adjusted R² = .829). In conclusion, the predictability of the relative height of the larynx was partially confirmed in a non-invasive manner.

• Journal of Satellite, Information and Communications
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• v.12 no.1
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• pp.107-113
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• 2017

Recently, digital signage is various changes and converging media. It is common to exhibit and guide focusing on information transfer by using the display. Such a method can not express variously changing digital signage. Therefore, we have to find a way to solve the problem of place and structure. In this paper, we experimented the new direction technique. Finally, we are going to propose acoustic direction technique using a microphone to maximize digital signage and intention of delivery by adding an sound reinforcement method to the visual representation.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.574-585
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• 2008

3D sound is of central importance for the virtual reality system, and is becoming increasingly important for the auditory displays and for the human-computer interaction. In this paper, we propose a novel real-time 3D sound representation system for virtual reality. At first, we propose a calculation method of the impulse response for virtual space. To transmit the information of the virtual space, we propose an enhanced DXF file type that contains the material information. And then, we implement the multi-channel sound panning system. we perform the experiment based on computer simulation and prove the utility of the proposed method.

• The Journal of the Acoustical Society of Korea
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• v.20 no.2
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• pp.66-76
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• 2001

Conventional echo watermarking techniques often exhibit inherent trade-offs between imperceptibility and robustness. In this paper, a new echo embedding technique is proposed. The proposed method enables one to embed high energy echoes while the host audio quality is not deteriorated, so that it is robust to common signal processing modifications and resistant to tampering. It is possible due to echo kernels that are designed based on psychoacoustic analyses. In addition, we propose some novel techniques to improve robustness against signal processing attacks. Subjective and objective evaluations confirmed that the proposed method could improve the robustness without perceptible distortion.

• The Journal of the Acoustical Society of Korea
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• v.30 no.4
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• pp.231-237
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• 2011

The purpose of this study is to examine the correlation between the preferred sensation type and speech sounds, especially on $F_0$ and the speech rates. Data for the sensation types and speech sounds were collected from 36 undergraduate and graduate students (17 male, 19 female). Subjects were asked to read a given text (400 syllables), describe a drawing, and give answers to some questions. We measured speakers' $F_0$ and speech rates. The results show that type V (Visual) has the correlation with the speech rates when type D (Digital) was ruled out, and type A (Auditory) has the correlation with the speech rates when type D was included. Furthermore, the analysis of the mean values of V, A, K (Visual, Auditory, Kinethetic) indicates that type V is characterized with faster speech rates and higher $F_0$ in all parts except for interview and the same is true for that of V, A, K, D (Visual, Auditory, Kinethetic, Digital) in all parts. In conclusion, this study proved that the preferred sensation type has the correlation with $F_0$ and speech rates. Based on the results of this study, $F_0$ and speech rates can be used to analyze the sensation types for individualized education as well as consultation. In addition, this study has great significance in that it lays a foundation for the study on the correlation between a preferred sensation type and speech sounds.