• Title/Summary/Keyword: Acoustic characteristics

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Study for Improving Acoustic Characteristics of the Conference Room (회의장에서의 실내음향특성 개선에 관한 연구)

  • 김상수;황효성;박영원;채장범
    • The Journal of the Acoustical Society of Korea
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    • v.19 no.2
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    • pp.73-82
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    • 2000
  • This paper presents a significant improvement achieved in the acoustic characteristics of a conference room of I-company originally designed and built without consideration for room acoustic characteristics. The reverberation time of the room was excessive, which resulted in poor 'Definition' for speech. Thus the improvement of room acoustic characteristics was required. In this study, experiments and simulations using the principles of geometrical acoustics were executed to improve the acoustic characteristics in the room. By performing a series of simulation, it has become possible to predict acoustic parameters for an improvement plan. And the improvement plan of room acoustic characteristics was established. And for the verification of the simulation results, the experimental data were compared and evaluated against those from the simulation. Additionally, the proposed method in this paper demonstrated its effectiveness by successfully improving the room acoustic characteristics resulted from repair construction.

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Acoustic Characteristics and Auditory Cues for Korean Lax vs. Tense Fricative Distinction (한국어 평마찰음과 경마찰음의 음향적 특성과 지각 단서 - 길이를 중심으로 -)

  • 이경희;이봉원
    • The Journal of the Acoustical Society of Korea
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    • v.19 no.2
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    • pp.95-100
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    • 2000
  • The purpose of this paper is to show their distinctive auditory cues. Until now research of acoustic characteristics has been confined to simple experiments concerning the restricted conditions. Therefore this paper examines all of the acoustic characteristics of the lax and tense Fricative Consonants and shows to how acoustic characteristics can be used to differentiate lax and tense Fricative Consonants. The results of this paper are (a) auditory cues are especially important if there is a large difference between acoustic characteristics, (b) the lax and tense Fricative Consonant's distinctive auditory cues contain a hierarchy, and (c) there is a different hierarchy between CV and VCV.

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Acoustic Characteristics Analysis of the Axi-symmetric Transducer by the combined Finite Element Method and Hybrid Type Infinite Element Method, Part II : Wideband Array Transducer Design and its Acoustic Characteristics (유한요소법과 하이브리드형 무한요소법의 결합에 의한 축대칭 변환기의 음향 특성해석(II) ;광대역 배열 변환기의 설계 및 그 음향특성)

  • Kim, Chun-Duck;Kim, Won-Ho;Kim, Dae-Whan;Yoon, Jong-Rak
    • The Journal of the Acoustical Society of Korea
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    • v.13 no.2
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    • pp.68-75
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    • 1994
  • This is the second of two companion papers wich describes the wideband array transducer design procedure and the designed transducer acoustic characteristics. In addition, the result of the designed transducer acoustic characteristics by the combined Finite Element Method and Hybrid Type Infinite Element Method, is found to better than that by the equivalent circuit model method. Therefore, the technique presented in this paper could be applied in the design and the acoustic characteristics analysis of the wideband array transducer.

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Acoustic characteristics and perceptual cues for Korean Stops (한국어 파열음의 음향적 특성과 지각 단서)

  • Lee, Kyung-Hee;Jung, Myung-Sook
    • Speech Sciences
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    • v.7 no.2
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    • pp.139-155
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    • 2000
  • The aim of this research is to investigate acoustic characteristics of three different types of Korean Stops-plain, tensed, and aspirated-, and employ these as a base to determine which one(s) can be used as perceptual cues. In this paper, we have examined acoustic characteristics of Korean Stops, especially voice onset time(VOT), closure duration(CD), degree of pitch of following vowels and differences in the intensity of the Stops build-up after the onset of voicing. From the above characteristics, differences can be made between word-initial and word-medial positions. That is to say, in word-initial position, the three Korean Stops are distinguished by VOT and pitch, whereas in word-medial by CD, VOT and pitch. However, the acoustic characteristics do not have the same value as perceptual cues. In both word-initial, and medial positions, the immediately following vowels play the most important role in perceiving Korean Stops. And in case of word'-medial positions,. CD and VOT also play important perceptual roles. In order to have a more fine-grained distinction among Korean Stops, we think future research should be done to investigate which factor(s) of the following vowels is/are the most determinative perceptual cue(s). However, based on our investigation, we may conclude that it is highly plausible that pitch can be one of the most important perceptual cues when distinguishing the three Korean Stops.

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Acoustic characteristics of Korean vowels on pitch alteration utterance (피치 변경 발성에 따른 모음의 음향적 특성)

  • 조창수;홍광석
    • Proceedings of the IEEK Conference
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    • 2003.07e
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    • pp.2439-2442
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    • 2003
  • In this paper, we examine the acoustic characteristics of Korean vowels on pitch alteration utterance. The prosody is known as an indicator of acoustic characteristics of emotions. Also, speech is acoustically differenced according to the emotional variation and environmental variation, although speaker utters the same speech. We analyzed the spectral envelopes and formants from the voiced regions as data points on the speech waveform.

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Study on Acoustic Characteristics of the Watermelon (수박의 음향특성에 관한 연구)

  • 김만수;최동수;이영희;조영길
    • Journal of Biosystems Engineering
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    • v.23 no.1
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    • pp.57-66
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    • 1998
  • This study was conducted to investigate the relationships between parameters affecting internal quality of watermelon and its acoustic characteristics. The measuring and analyzing system was established to study the acoustic characteristics of watermelon. Algorithms for analyzing sound signals were developed. Sound signals which was detected with the microphone were filtered, and their spectrum was computed by means of the Fast Fourier Transform. As watermelon changed from the unripe stage to ripe, acoustic waves in time domain became complicated, and several components appeared in frequency domain. The correlationship was investigated between some parameters affecting internal quality of the watermelon and several peak frequencies. Results indicated that weight, density and sugar content had high correlations with several frequencies(the first peak frequency, the second peak frequency, and the third peak frequency). And the sugar content and the volume of the watermelon were highly correlated with the third peak frequency.

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The Relationship between Acoustic Characteristics and Voice Handicap Index in Esophageal Speakers (식도발성 환자의 음향학적 특성과 음성장애지수의 상관성)

  • Jang, Hyo-Ryung;Shim, Hee-Jeong;Shin, Hee-Baek;Ko, Do-Heung;Kim, Hyun-Ki
    • Phonetics and Speech Sciences
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    • v.6 no.2
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    • pp.115-121
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    • 2014
  • This paper investigates the relationship between acoustic characteristics and voice handicap index for 29 males with esophageal speakers. Acoustic characteristics were measured by using a sustained vowel /a/ three times. The stable vocalization for 2 seconds was analyzed by MDVP program. Specifically, relationships between four VHI scores (total, functional, physical, and emotional) and three acoustic characteristics (jitter, shimmer, and NHR) were investigated using the Pearson correlation coefficient. As results, we found no relationship between NHR and VHI scores. However, both jitter and shimmer had statistically significant correlations with all four VHI scores. This research will contribute to establishing a baseline related to speech characteristics in voice rehabilitation with esophageal speakers. Further research could be done to examine the overall quality of life survey, which is widely used as a subjective measure about voice for patients with esophageal speakers.

The Acoustic Characteristics of the Korean Accusative Marker {l${\i}$l} in Discourse (담화상에 나타나는 목적격표지 {-를}의 음향적 특성)

  • Kim, Kee-Ho;Kim, Hwa-young;Kim, Min-Jung
    • Speech Sciences
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    • v.6
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    • pp.55-82
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    • 1999
  • The purpose of this paper is to investigate the acoustic characteristics of the Korean accusative marker {-lil} which functions as a discourse marker in discourse. Generally, in written texts or read speeches, it is seldom omitted and it certainly seems to serve a grammatical function. But in ordinary discourse, speakers do not use it in many cases. That is, the environments speakers use {-lil} differ from those they do not. According to the semantic interpretations, {-lil} functions as a pragmatic factor and adds to the meaning of the object in an utterance. In this paper, by comparing the acoustic characteristics of the utterances that contain the marker {-lil} with those of utterances that do not, especially based on Korean Intonational Phonology, we will demonstrate that the Korean accusative marker {-lil} shows clearly the acoustic characteristics related to the pragmatic factors which reflect speakers' special intention.

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Acoustic characteristics of a loudspeaker obtained by vibration and acoustic analysis (진동/음향 해석에 의한 스피커의 음향특성 연구)

  • Kim, Jung-Ho;Kim, Jun-Tai;Kim, Jin-Oh;Min, Jin-Ki
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.10
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    • pp.1742-1756
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    • 1997
  • The acoustic characteristics of a direct radiator type loudspeaker has been studied in this paper. The natural modes of the speaker cone vibration analyzed numerically by the finite element method have been verified by comparing them with experimental results. The so-ap-proved finite-element model has been used to calculate the vibration response of the cone excited by the voice coil. The vibration displacement of the speaker cone paper has been converted into the vibration velocity and used as a boundary condition for the acoustic analysis. The frequency characteristics, directivity, and sound pressure distribution of the loudspeaker have been calculated by the boundary element method. The numerical results have been verified by the experiments carried out in an anechoic chamber. The variations of the acoustic characteristics due to the changes of some design parameter values can be examined using the numerical model.

Acoustic Characteristics of Patients with Total Laryngectomees via Voice Rehabilitation Techniques (후두적출술 환자의 발성법에 따른 음향학적 특성)

  • Jang, Hyo-Ryung;Shim, Hee-Jeong;Ko, Do-Heung
    • Phonetics and Speech Sciences
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    • v.5 no.4
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    • pp.25-32
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    • 2013
  • This research is aimed at finding the acoustic characteristics of different voice rehabilitation techniques, the electrolaryx (EL), standard esophageal (SE), and tracheoesophageal (TE), used on 17 patients with laryngectomees. The analysis of the voice qualities was achieved using MDVP. In order to compare the acoustic characteristics, patients were asked to produce the vowel /a/ sound. The acoustic analysis included fundamental frequency (f0), jitter, shimmer, and noise-to-harmonic ratio (NHR). The main acoustic results showed no significant statistical differences between the average measurements of SE and TE speakers. It was found that the current study showed the same tendency found in previous studies. There was also a significant difference between SE and EL speakers. On the other hand, there were no significant statistical differences between the average measurements of TE and EL speakers on all acoustic measurements. This research will contribute to establishing a baseline related to speech characteristics in voice rehabilitation for patients with laryngectomees. In future, the present findings and issues should be considered in the context of gender. Specifically, the number of women who are diagnosed with laryngeal cancer continues to rise and their acoustic characteristics may indeed differ from those of men.