Browse > Article

A new acoustical parameter for speech intelligibility with regard to early vertical reflections  

Park, Jong Young (목포대학교 대학원)
Han, Myung Ho (목포대학교 친환경건축연구센터)
Jeong, Dae Up (전북대학교 공과대학 건축공학과)
Oh, Yang Ki (목포대학교 건축학과)
Publication Information
KIEAE Journal / v.7, no.3, 2007 , pp. 63-70 More about this Journal
Abstract
It is known that early reflections, their energy and delay times after the arrival of direct sound are important factors for speech intelligibility. In this basis, acoustical parameters like D50 and C80 had been proposed and are widely used for assessing the listening condition of rooms. These parameters are focused on the fraction of the early energy to the total, regardless of the spatial characteristics of the early reflections. This means that all the early reflections, arrived in certain time boundary. from front, behind, down and upside have the same impact on speech intelligibility. From the questionable simplicity, the influence of the direction of early reflections on speech intelligibility is examined in this study. A computer simulation speech intelligibility test, conducted for 22 university students, found that the reflection of vertical direction with method of the Paired comparison also the preference of 0.746 degree was visible an increase.
Keywords
Room Acoustics; Early Reflection; Speech intelligibility; Paired comparison; Auralization;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Peutz, V.M.A., "Articulation loss of consonantsas a criteria for speech transmission in a room,"J. Aud. Eng. Soc. 19, 12, December (1971)
2 Thiele, R., "Richtungsverteilung und Zeitfolge der Schallruckwurfe in Raumem," Acoustica, 3, 291-302,(1953)
3 강성훈,강경옥."입체음향"기전연구사(1997)
4 心理學實驗指導硏究會編, 實驗とテスト一心理學の基礎一, 實習編, pp.78-82, p.166, p.173-175,(1983)
5 ANSI S 3.5 Methods for the Calculation Articulation Index (1969)
6 H. Hass "The Influence of a Single Echo on the Audibility of speech", J. Andio. Eng. Soc. 20, pp.146-159.(1972)
7 국어정보베이스PBS시스템(http://kibs.kaist.ac.kr/beginner/vbase.htm)
8 Steeneken, H.J.M. and Houtgast, T. "A review of the MTF concept in room acoustics and its use for estimating speech intelligibility in auditoria," Institute for Perception TNO, Soesterberg, the Netherlands. (1984)
9 R. Kurer, "Zur gewinnung von eizahlkriterien bei impulsmessungeg in der raumakustik", Acustica, 21(1969)
10 정대업.오양기.주현경 "초기반사음의 도달방향과 지연시간이 명료도에 미치는 영향에 관한 연구",대한건축학회논문집 제18권 1호 203-208.(2002)
11 W. Reichardt, O. Abdel Alim, and W. Schmidt, "Definition and basis of making an objective evaluation to distinguish between useful and useless clarity defining musical performances," Acustica 32, 126-137 (1975)
12 ANSI E 1130-02 Standard Test Method for Objective Measurement of Speech Privacy in Open Offices Using Articulation Index (1947)