• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2004년도 정기총회 및 학술대회
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• pp.215-219
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• 2004

차세대 실감 방송에서의 오디오 신호는 정보의 전달이라는 기존의 역할을 넘어서 현장감의 재현이라는 실감 방송의 목표를 구현하는 역할을 감당하게 될 것이다. 이 논문에서는 이러한 차세대 실감 방송에서 오디오 신호가 가지는 심리음향학적인(psychoacoustic) 특성을 방송현장의 운용자들을 위해 기존의 연구들에 근거하여 선명하였다. 차세대 방송은 첫째, 멀티채널 오디오 방송, 둘째, 고 해상도 데이터의 활용 그리고 셋째, 멀티 모달 전송로 특정지울 수 있는 새로운 오디오 산업의 기술진행 방향을 통해, 방송으로 전달되어지는 객체에 대하여 개선된 정위(localization), Envelopment 명료도(Clarity)등의 개선된 심리음향학적인 특성을 가지게 한다. 이와 같은 심리음향학적인 개선은 운용자의 올바른 개념적인 이해와 결합하여 보다 현장감 넘치는 방송을 청취자들에게 가져다 줄 것이다.

• 방송공학회논문지
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• 제8권1호
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• pp.11-18
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• 2003

본 논문에서는 잡음 에너지에 의한 지각적 간섭현상 해석을 통한 지각적 컨벌루션 잡음 제어에 의한 음질 개선 방법을 연구하였다. 지각적 컨벌루션 잡음은 잡음에 의한 신호의 지각적인 특성 변화 및 잡음 추정오차에 의한 잔여 잡음의 영향을 반영하는 것이다. 실험 결과 임계대역 여기 에너지를 통한 지각적 부가 잡음 제어 필터와 순음도 변화도를 통한 지각적 컨벌루션 잡음 제어 필터가 대등한 음질 개선 성능을 나타내었으며, 다양한 잡음 환경에서도 우수한 음질 개선을 나타냄을 확인 할 수 있었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.513-518
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• 2013

The purpose of vehicle horn sound is for warning to pedestrians. In the past, the main development factor is to match the regulation level. But nowadays perceived quality is more important than level itself. In this study, we measure variety horn sound and evaluate its signals through the jury evaluation aimed at making horn sound quality index. Each contribution of the noise path for sound quality is identified and the target values and methods for implementing the luxurious horn sound are suggested. Finally, we developed, horn component and improve horn mounting condition for luxurious horn sound.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 추계학술대회 논문집
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• pp.519-524
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• 2013

The purpose of this study is that developing the index which evaluate sound quality of door latch and improving its sound quality through that results. For that, various operating sound of door latch was used for jury test. Loudness and sharpness related metrics are dominant in sound quality index we developed. This research investigate the main transfer path of its operating sound through sound field visualization and get conclusion that could reduce the impact sound of door latch. Therefore, we could verify sound quality improvement of modified product by using sound quality index.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.629-633
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• 2005

The reduction of the Vehicle interior noise has been the main interest of NVH engineers. The driver's perception on the vehicle noise is affected largely by psychoacoustic characteristic of the noise as well as the SPL. In particular, the HVAC sound among the vehicle interior noise has been reflected sensitively in the side of psychology. In previous study, we have developed to verify identification of source for the vehicle HVAC system through multiple-dimensional spectral analysis. Also we carried out objective assessments on the vehicle HVAC noises and subjective assessments have been already performed with 30 subjects. In this study, the linear regression models were obtained for the subjective evaluation and the sound quality metrics. The regression procedure also allows you to produce diagnostic statistics to evaluate the regression estimates including appropriation and accuracy. Appropriation of regression model is necessary to $R^2$ value and F-value. And testing for regression model is necessary to Independence, Homoscedesticity and Normality. Also we selected optimum layout of damping material using Taguchi method. As a result of application, sound quality is improved by more quiet, powerful, expensive, smooth.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1998년도 춘계학술대회논문집; 용평리조트 타워콘도, 21-22 May 1998
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• pp.94-101
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• 1998

This paper presents the psychoacoustic analyses on the vehicle interior, noise generated when accelerating. Following the objective quantification for vehicle noises of different classes, the subjective decision process by the jury test is adopted to interrelate these results based on two different approaches. In particular, the paired comparison method is employed in assessing the sound quality in terms of the quietness, the powerfulness, and the pleasantness of the human auditory sensation. Special attention is paid to the physical interpretation of psychoacoutic parameters and their interrelation to the subjective assessment scores. In order to ensure the integrity of statistics of the survey, various tests are performed. The results show that the consistency of the "quiet" sensation is far higher than that of the "powerful" and the "pleasant" sensations. Also, it is found that the most significant parameter determining these feelings turns out to be the inherent loudness of the noise instead of the conventional indicators such as the weighted sound pressure level. It may be concluded that the psychoacoustic analysis offers more realistic evaluation for vehicle noise and assists the improvement of NVH more efficiently.ement of NVH more efficiently.

• 한국음향학회지
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• 제20권7호
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• pp.3-12
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• 2001

본 연구에서는 소리에 대한 주관적 평가 인자 중 하나인 러프니스 계산 모델을 구현하였다. 구현된 러프니스 모델은 기존 모델의 고찰을 통해 계산 모델을 구체화하였으며, 주파수 영역으로부터 상호 상관 인자를 구하는 방법 등을 이용하여 계산 효율 및 정확도를 향상시켰다. 또한 기존의 주관적인 러프니스 평가치와의 비교를 통해 구현된 모델의 유용성을 확인하였다. 한편 기존 모델 및 구현된 러프니스 계산 모델을 통해 얻을 수 있는 러프니스 스펙트럼이 주파수 영역에서의 슬롭 가진(slope excitation)의 영향으로 인해 실제 변조되는 주파수 대역을 탐색하기 어려운 점을 발견하고, 구현된 모델의 상관 인자 계산 부분을 실제 변조가 발생하는 임계 대역에서만 러프니스 스펙트럼 값이 존재하도록 수정하여, 러프니스 기여성분의 탐색이 보다 용이해진 방법을 제안하였다.

• 방송공학회논문지
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• 제11권4호
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• pp.448-457
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• 2006

일반적으로 3D 입체음향을 생성하기 위해서는 소리가 음원으로부터 청자의 두 귀에 이르는 정보를 포함하고 있는 머리전달함수를 사용한다. 그러나 HRTF의 비개인화적인 특성 때문에 양쪽 귀까지의 거리가 같아지는 혼돈원추상에서는 앞/뒤 방향지각에 대한 혼돈을 주게 됨으로써 입체감을 저하시키게 된다. 이에 본 논문에서는 인간의 청각특성에 따른 여기에너지를 이용하여 앞/뒤 음상정위의 특성을 개선하는 방법을 제안하고자 한다. 서로 대칭되는 각 HRTF의 여기 에너지를 계산하고 각 bark 대역에 따른 에너지의 비율을 추출하는 방식으로써 각 HRTF의 스펙트럼 특성을 부각시키는 방법을 제안하였으며 청감테스트를 통해서 제안한 방식이 기존 방법보다 방향감을 개선시킴을 확인할 수 있었다.

• 대한기계학회논문집A
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• 제30권6호
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• pp.728-733
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• 2006

The reduction of the Vehicle interior noise has been the main interest of NVH engineers. The driver's perception on the vehicle noise is affected largely by psychoacoustic characteristic of the noise as well as the SPL. In particular, the HVAC sound among the vehicle interior noise has been reflected sensitively in the side of psychology. In previous study, we have developed to verify identification of source for the vehicle HVAC system through multiple-dimensional spectral analysis. Also we carried out objective assessments on the vehicle HVAC noises and subjective assessments have been already performed with 30 subjects. In this study, the linear regression models were obtained for the subjective evaluation and the sound quality metrics. The regression procedure also allows you to produce diagnostic statistics to evaluate the regression estimates including appropriation and accuracy. Appropriation of regression model is necessary to $R^2$ value and F-value. And testing for regression model is necessary to independence, homoscedesticity and normality. Also we selected optimum layout of damping material using Taguchi method. As a result of application, sound quality is improved more quietly, powerfully, even though costly, and smoothly.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계 학술대회논문집(수송기계편)
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• pp.174-179
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• 2005

In automotive engineering, the brand sound is one of the important advantage strategy in a car company. For the design of brand sound, the selection of descriptive word for a car sound is one of major works in automotive sound quality research. In paper, booming sound and rumbling sound, which are professional words used by NVH engineers are used for the design of brand sound. We employed sound metrics which are the subjective parameter used in psychoacoustics. According to most research results, the relationship between subjective evaluations and sound metrics has nonlinear characteristics and is very complex. In order to link these subjective evaluations to sound metrics, the artificial neural network technology has been applied to two-dimensional sound quality index for a passenger car. These indexes is used for 46 passenger cars, which are samples of famous cars in the world. Also the preference in car sounds is evaluated by the trained NVH engineers. We coupled this preference with booming and rumbling sounds by using artificial neural network. In future, the two -dimensional sound index and preference index are very useful fur the development of brand sound in passenger cars.