• 대한전자공학회논문지SP
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• 제47권5호
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• pp.18-24
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• 2010

본 논문에서는 돌비 프로로직 II/IIx를 대체하기 위한 가상 음원 위치 정보 기반의 새로운 메트릭스 디코더 시스템을 제안하고자 한다. 제안하는 신규 메트릭스 디코더는 역행렬 계산을 통해 얻어지는 수동 메트릭스 디코딩부와 수동 메트릭스 디코딩을 통해서 얻은 신호들을 멀티채널 신호의 채널간 이미지 특성에 따라서 적응적으로 가변시키는 능동 메트릭스 디코딩부로 구성된다. 멀티채널 환경에서 채널 간에 형성되는 다수의 이미지는 실제 청각 시스템에 의해서 인지되어 만들어지는 가상의 사운드 이벤트와 연결이 되어 있다. 따라서 이 이미지의 위치와 크기에 기반하여 멀티채널 신호를 적응적으로 가변시키면, 인지적인 관점에서 우수한 성능의 메트릭스 디코더를 설계할 수 있다. 더불어 채널간 분리도를 향상시키기 위해서 비선형 삼각함수의 조합을 사용하였다.

• Journal of Audiology & Otology
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• 제24권4호
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• pp.180-190
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• 2020

Background and Objectives: Although many studies have evaluated the effect of the digital noise reduction (DNR) algorithm of hearing aids (HAs) on speech recognition, there are few studies on the effect of DNR on music perception. Therefore, we aimed to evaluate the effect of DNR on music, in addition to speech perception, using objective and subjective measurements. Subjects and Methods: Sixteen HA users participated in this study (58.00±10.44 years; 3 males and 13 females). The objective assessment of speech and music perception was based on the Korean version of the Clinical Assessment of Music Perception test and word and sentence recognition scores. Meanwhile, for the subjective assessment, the quality rating of speech and music as well as self-reported HA benefits were evaluated. Results: There was no improvement conferred with DNR of HAs on the objective assessment tests of speech and music perception. The pitch discrimination at 262 Hz in the DNR-off condition was better than that in the unaided condition (p=0.024); however, the unaided condition and the DNR-on conditions did not differ. In the Korean music background questionnaire, responses regarding ease of communication were better in the DNR-on condition than in the DNR-off condition (p=0.029). Conclusions: Speech and music perception or sound quality did not improve with the activation of DNR. However, DNR positively influenced the listener's subjective listening comfort. The DNR-off condition in HAs may be beneficial for pitch discrimination at some frequencies.

• 대한청각학회지
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• 제24권4호
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• pp.180-190
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• 2020

Background and Objectives: Although many studies have evaluated the effect of the digital noise reduction (DNR) algorithm of hearing aids (HAs) on speech recognition, there are few studies on the effect of DNR on music perception. Therefore, we aimed to evaluate the effect of DNR on music, in addition to speech perception, using objective and subjective measurements. Subjects and Methods: Sixteen HA users participated in this study (58.00±10.44 years; 3 males and 13 females). The objective assessment of speech and music perception was based on the Korean version of the Clinical Assessment of Music Perception test and word and sentence recognition scores. Meanwhile, for the subjective assessment, the quality rating of speech and music as well as self-reported HA benefits were evaluated. Results: There was no improvement conferred with DNR of HAs on the objective assessment tests of speech and music perception. The pitch discrimination at 262 Hz in the DNR-off condition was better than that in the unaided condition (p=0.024); however, the unaided condition and the DNR-on conditions did not differ. In the Korean music background questionnaire, responses regarding ease of communication were better in the DNR-on condition than in the DNR-off condition (p=0.029). Conclusions: Speech and music perception or sound quality did not improve with the activation of DNR. However, DNR positively influenced the listener's subjective listening comfort. The DNR-off condition in HAs may be beneficial for pitch discrimination at some frequencies.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.1276-1279
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• 2006

This article on environmental noise qualify is concerned with the relationships between the annoyance and perception and sound quality metrics according to exposition time for traffic noise. For invested the characteristics of noise quality, we conducted to the subjective experiments of the annoyance response using the absolute 100 scaling method for the traffic noise sources. The traffic noise sources are composed to varieties exposition time from 15sec to 1200sec. As the results, the first there are decreased the perception loud level for the increase of exposition time with logarithm scale, but increased the annoyance. Second, evaluation index of annoyance is correlated to the loudness(sones), tonality and logarithm scale time with R2=0.83. Also, the composition ratio of traffic noise according to exposition time has the change of range as the logarithm scale ($30{\sim}50%$), tonality($27{\sim}37%$) and loudness($34{\sim}20%$).

• 감성과학
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• 제15권2호
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• pp.231-238
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• 2012

본 연구는 하나의 감각으로 인해 다른 영역의 감각을 불러일으키는 공감각 현상을 기초로 하여 사운드에서 컬러이미지를 유추하여 생성하는 응용 시스템의 구현을 최종 목표로 한다. 이를 위해 사운드의 특징정보인 기본주파수(F0, Fundamental Frequency)에서 음계(Scale) 및 옥타브(Octave) 성분을 추출한 후, HSI 컬러모델인 색상(Hue), 명도(Intensity) 성분에 각각 매핑한다. 본 논문에서 채도(saturation)값은 고정된 값을 사용한다. 이를 다시 RGB 컬러모델로 변환한 후 최종 BMP 포맷으로 컬러 이미지를 출력한다. 본 연구에서 제시한 사운드-컬러이미지 변환 방법을 토대로 기본 변환 시스템을 구현해 본 결과, 기본주파수에서 추출된 음계 및 옥타브 성분의 변화에 따라 색상 및 명도가 상이한 다양한 컬러가 나오는 것을 확인할 수 있었다. 또한 하드웨어적 구현을 위해 TMS320C6713 DSP Board에 포팅하여 실험한 결과 제안된 시스템의 시뮬레이션 결과와 동일한 컬러 이미지가 출력됨을 확인하였다.

• International journal of advanced smart convergence
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• 제5권4호
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• pp.15-20
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• 2016

When a virtual sound source for 3D auditory system is reproduced by a linear loudspeaker array, listeners can perceive not only the direction of the source, but also its distance. Control over perceived distance has often been implemented via the adjustment of various acoustic parameters, such as loudness, spectrum change, and the direct-to-reverberant energy ratio; however, there is a neglected yet powerful cue to the distance of a nearby virtual sound source that can be manipulated for sources that are positioned away from the listener's median plane. This paper address the problem of generating binaural signals for moving sources in closed or in open environments. The proposed perceptual enhancement algorithm composed of three main parts is developed: propagation, reverberation and the effect of the head, torso and pinna. For propagation the effect of attenuation due to distance and molecular air-absorption is considered. Related to the interaction of sounds with the environment, especially in closed environments is reverberation. The effects of the head, torso and pinna on signals that arrive at the listener are also objectives of the consideration. The set of HRTF that have been used to simulate the virtual sound source environment for 3D auditory system. Special attention has been given to the modelling and interpolation of HRTFs for the generation of new transfer functions and definition of trajectories, definition of closed environment, etc. also be considered for their inclusion in the program to achieve realistic binaural renderings. The evaluation is implemented in MATLAB.

• 대한청각학회지
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• 제24권2호
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• pp.71-78
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• 2020

Background and Objectives: Currently limited information is available on speech stimuli processing at the subcortical level in the recipients of cochlear implant (CI). Speech processing in the brainstem level is measured using speech-auditory brainstem response (S-ABR). The purpose of the present study was to measure the S-ABR components in the sound-field presentation in CI recipients, and compare with normal hearing (NH) children. Subjects and Methods: In this descriptive-analytical study, participants were divided in two groups: patients with CIs; and NH group. The CI group consisted of 20 prelingual hearing impairment children (mean age=8.90±0.79 years), with ipsilateral CIs (right side). The control group consisted of 20 healthy NH children, with comparable age and sex distribution. The S-ABR was evoked by the 40-ms synthesized /da/ syllable stimulus that was indicated in the sound-field presentation. Results: Sound-field S-ABR measured in the CI recipients indicated statistically significant delayed latencies, than in the NH group. In addition, these results demonstrated that the frequency following response peak amplitude was significantly higher in CI recipients, than in the NH counterparts (p<0.05). Finally, the neural phase locking were significantly lower in CI recipients (p<0.05). Conclusions: The findings of sound-field S-ABR demonstrated that CI recipients have neural encoding deficits in temporal and spectral domains at the brainstem level; therefore, the sound-field S-ABR can be considered an efficient clinical procedure to assess the speech process in CI recipients.

• Journal of Audiology & Otology
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• 제24권2호
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• pp.71-78
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• 2020

Background and Objectives: Currently limited information is available on speech stimuli processing at the subcortical level in the recipients of cochlear implant (CI). Speech processing in the brainstem level is measured using speech-auditory brainstem response (S-ABR). The purpose of the present study was to measure the S-ABR components in the sound-field presentation in CI recipients, and compare with normal hearing (NH) children. Subjects and Methods: In this descriptive-analytical study, participants were divided in two groups: patients with CIs; and NH group. The CI group consisted of 20 prelingual hearing impairment children (mean age=8.90±0.79 years), with ipsilateral CIs (right side). The control group consisted of 20 healthy NH children, with comparable age and sex distribution. The S-ABR was evoked by the 40-ms synthesized /da/ syllable stimulus that was indicated in the sound-field presentation. Results: Sound-field S-ABR measured in the CI recipients indicated statistically significant delayed latencies, than in the NH group. In addition, these results demonstrated that the frequency following response peak amplitude was significantly higher in CI recipients, than in the NH counterparts (p<0.05). Finally, the neural phase locking were significantly lower in CI recipients (p<0.05). Conclusions: The findings of sound-field S-ABR demonstrated that CI recipients have neural encoding deficits in temporal and spectral domains at the brainstem level; therefore, the sound-field S-ABR can be considered an efficient clinical procedure to assess the speech process in CI recipients.

• 인지과학
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• 제27권1호
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• pp.129-157
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• 2016

본 연구는 한국어의 소음속말인지(Speech perception in noise, SPIN)에 대하여 알아 보았다. 영어의 SPIN 테스트와 비슷한 형식을 채택하여 새로운 한국어 SPIN 테스트를 개발하였다. 예측성 효과와 소음효과, 이 둘의 상호작용에 대하여 알아봄으로써 기존의 영어에 기반을 둔 연구에서 발견한 것들을 재확인하고자 하였다. 새로운 한국어 SPIN 테스트를 사용하여 14명의 성인 한국인을 대상으로 한 실험 결과는 이전 연구들이 발견한 사항들을 다시 한 번 입증하였다. 첫째, 참여자들의 대체적인 SPIN 수행능력은 상대적으로 고소음 보다 저소음환경에서 더 나았다. 둘째, 문맥상 비교적 예측하기 쉬운 단어들이 예측하기 어려운 단어들보다 특히 고소음 환경에서 더 정확히 인지되었다. 이러한 결과는 청자들이 두 가지 종류의 정보, 즉 음성적 정보와 문맥적 정보를 말인지에 적극적으로 사용한다는 것을 의미하는 것으로 해석할 수 있다. 소음으로 인해서 말소리의 음성적인 특징이 약해졌을 때 청자들은 말소리를 처리하기 위해서 언어적 문맥정보를 적극적으로 이용하는 것이다. 본 연구에서 발견한 것들은 영어의 SPIN 테스트에 기반을 둔 기존 연구들에서 발견한 것과 일치한다. 게다가, 표적어의 빈도 효과에 대한 가능성을 발견하였는데, 이는 한국어의 이 분야에 대한 더 다양하고 활발한 연구가 있어야 함을 시사한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.511-514
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• 2007

This study aims to derive the effect of road traffic noise perception by the visual and aural information through a laboratory experiment. To verify the result more precisely, ME(Magnitude Estimation) and SD(Semantic Differential Method) evaluation on the effect of visual and aural effect were carried out by 43 university students. As the result, up to 10% of psychological reduction effect was shown under the 65dB(A). As the noise level, it was analyzed that the vision affected about 7dB(A) and sound affected 5dB(A). However, if these two are given simultaneously, mainly sound affects to reduce the annoyance of noise and the vision next. Compared with the urban central circumstances, this effect(2dB(A) under 65dB(A) noise) was shown smaller than field test.