Some further investigations of the seat dip effect

Bradley, John S.

doi:10.1121/1.401302

Cited by 27 publications

(38 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are thought to be due to a shift in the frequency of the maximum attenuation of the grazing incidence seat dip attenuation. This attenuation is known to be dependent on the angle of incidence of the sound, 6 and the frequency of the maximum attenuation shifts lower in frequency as the angle of incidence departs from grazing incidence. As an example.…”

Section: Spatial Variation Of the Effects Of An Orchestra Shell At Aumentioning

confidence: 99%

Some effects of orchestra shells

Bradley

1996

The Journal of the Acoustical Society of America

Self Cite

View full text Add to dashboard Cite

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. America, 100, 2, pp. 889-898, 1996-07-01 Some effects of orchestra shells Bradley, J. S. Journal of the Acoustical Society ofhttp://www.nrc-cnrc.gc.ca/irc Som e e ffe c t s of orc he st ra she lls NRCC-39036Bradley, J.S. July 1996A version of this document is published in / Une version de ce document se trouve dans:Journal of the Acoustical Society of America, 100, (2), pp. 889-898, July 01, 1996The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Sdme effects of orchestra shells J. S. BradleyInstitute for Research in Construction, National Research Council, Montreal Road, Ottawa KIA OR6, Canada (Received 26 May 1995; revised 22 March 1996; accepted 26 March 1996) This paper presents room acoustic measurements of the effects of adding or modifying an orchestra shell in several halls. The average effects, at audience seats, of adding an orchestra shell in three large multipurpose halls were small but within predicted ranges. At mid-and high frequencies, partial shells produced intermediate results. However, at lower frequencies more complex effects were observed, because the addition of an orchestra shell modified the grazing incidence seat dip attenuation. 'These effects depended on the geometry of the shell and on the reCeiver position in the hall. On-stage measurements of support were increased by approximately 5 dB with the addition of an orchestra shell. Although orchestra shells had much larger effects on-stage, they were also found to produce significant audible effects at audience seats.

show abstract

Section: Spatial Variation Of the Effects Of An Orchestra Shell At Aumentioning

confidence: 99%

Some effects of orchestra shells

Bradley

1996

The Journal of the Acoustical Society of America

Self Cite

View full text Add to dashboard Cite

show abstract

“…While total G values do not vary greatly with frequency at this location, the dominant component does. At lower frequencies the late-arriving sound (G L ) is dominant and the seat dip attenuation [8] has greatly reduced the low frequencies of the early-arriving sound (G 80 ). At higher frequencies G 80 values are the dominant component.…”

Section: Example 1 Sound Level Details In a Multi-purpose Hallmentioning

confidence: 99%

Using ISO 3382 measures, and their extensions, to evaluate acoustical conditions in concert halls

Bradley

2005

Acoust. Sci. & Tech.

View full text Add to dashboard Cite

Application of the ISO 3382 standard can lead to the acquisition of large amounts of data describing conditions in a hall. The data could include the values of a number of measures at 6 or more octave band frequencies and for many combinations of source and receiver location. This paper discusses and gives examples of using this data to find important acoustical features. The amount of data can be reduced by calculating average values over the entire data set or for each sub-area of the hall. Various important spatial variations can often be better understood from plots of values versus source-receiver distance. The analysis approach will depend on the purpose of the study, which could be for comparisons with various criteria, for investigations of problems, or to better understand the acoustical properties of the hall. The significance of new measurements can be determined by comparing values: with proposed ideal criteria, with values in well-known halls, or with theoretical predictions. The importance of differences between two values should be considered in terms of published just noticeable differences for particular measures. Separately examining early-and latearriving sound levels can be a useful diagnostic tool for better understanding the acoustical properties of halls.

show abstract

“…[1][2][3] This phenomenon, called the seat-dip effect (SDE), colors the spectra of both the direct sound and some of the early reflections. The SDE varies with the direction of arrival, [1][2][3][4] and therefore the direct sound and the early reflections can have quite different lowfrequency spectra.…”

Section: Introductionmentioning

confidence: 99%

“…4,7,8 Yet, no perceptual studies have directly addressed sound quality or preference related to the SDE. This research focuses on the perception of the initial SDE in existing halls representing different degrees of initial SDE leveling.…”

Section: Introductionmentioning

confidence: 99%

“…Later, Davies et al 9 suggested that unattenuated early reflections can mask the perception of the SDE. Based on time-frequency analysis of the impulse responses in measured concert halls, Bradley 4 suggested that strong ceiling reflections can level the SDE, while P€ atynen et al 5 proposed that lateral reflections may serve that purpose better with less coloration. In general, uniform accumulation of spatial energy appears to level the SDE.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Perceptual significance of seat-dip effect related direct sound coloration in concert halls

Tahvanainen

Haapaniemi

Lokki

2017

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

In concert halls, the spectrum of direct sound (here 0 to 15 ms) is influenced by the seat-dip effect that causes selective low frequency attenuation. The seat-dip effect has been considered to be detrimental to the acoustic quality of halls, yet there is little evidence about the perceptual significance of the effect. This paper studies the discrimination and preference of seat-dip effect related changes in the direct sound, with realistic auralization of multichannel anechoic orchestra recordings in halls measured with the loudspeaker orchestra. Comparisons are made with a free-field direct sound and direct sound magnitude changes typically associated with the seat-dip effect. Overall, the differences were not significantly audible, except with a subgroup of participants in one out of four halls, and two out of three comparisons. Furthermore, participants' preference for the uncolored direct sound was significant in the halls with less reflected energy, but non-significant in the halls with more reflected energy. The results imply that for most seats in adequately reverberant halls, typical seat-dip effect related coloration in the direct sound can be perceptually negligible.

show abstract

Some further investigations of the seat dip effect

Cited by 27 publications

References 0 publications

Some effects of orchestra shells

Some effects of orchestra shells

Using ISO 3382 measures, and their extensions, to evaluate acoustical conditions in concert halls

Perceptual significance of seat-dip effect related direct sound coloration in concert halls

Contact Info

Product

Resources

About