Download - Odeon

More documents

Recommendations

Info

Publishing audible results on the Internet To publish calculated demonstration examples on the Internet, it may be useful to convert the result wave files into compressed .mp3 files or .wav Mpeg Layer3 files, as download times for wave files can be lengthy. One minute of compressed stereo signal will (depending on the compression rate) take up approximately 1 MB. If publishing examples, make sure that copyrights are not violated. You are free to publish examples, which are calculated using the anechoic examples supplied with ODEON (For the orchestra recordings the conditions as specified in the software license agreement § 8 must be observed, see p. 1-7). Remember to inform the end-user to use headphones when listening to the samples. Publishing results on an ordinary audio CD If a CD-R drive is installed on your PC it is quite easy to transfer the wave result files into an ordinary audio CD (most CD-R drives comes with the necessary software for this purpose). Most people have access to a CD audio player, so publishing results on an audio CD makes it easy to send demonstrations to clients etc. without worrying about whether they have a PC with a soundcard of a reasonable quality. Again when publishing examples, make sure that copyrights are not violated. You are free to publish examples, which are calculated using the anechoic examples supplied with ODEON (For the orchestra recordings the conditions as specified in the software license agreement § 8 must be observed, see p. 1-7). Remember to tell the end-user to use headphones when listening to the samples. 5-67
6 Calculation Principles 6.1 Global decay methods ODEON features two methods for calculating the Global decay of rooms: Quick Estimate, which is available from the Materials List, is the fastest method allowing quick evaluation of the effect of changes to materials. This method should be considered only as a tool for preliminary results. Global Estimate is the most precise of the two global methods allowing high quality results. 6.2 Quick Estimate This method estimates a mean absorption coefficient, which is inserted in the Sabine, Eyring and Arau-Puchades formulas to give an estimate of the reverberation time. Instead of simply taking the areas of the surfaces and multiplying by the corresponding absorption coefficients to obtain the total absorption in the room, ODEON also sends out 'particles' from the source, assuming diffuse conditions thus reflecting them in random directions, keeping a count on how many times they hit each surface. Surfaces that are hit very often then carry greater weight in the overall mean absorption coefficient of the room. Surfaces, which are not detected at all in the ray-tracing process, are left out of all calculations and surfaces which are hit on both sides are included twice in the calculation. As a result the estimated reverberation time corresponds to the sub-volume in which the selected source is located. Note however that if a part of the area of a surface, which is present in the sub-volume, is located outside that sub-volume (e.g. if two sub-volumes share the same floor surface) then area and surface estimates for the statistical calculations may not be entirely correct. In that case it is possible to set a volume manually. The classical mean absorption coefficient is given by: i i S i S i i where S i and i are the area and absorption coefficient of the i th room surface, respectively. The modified mean absorption coefficient as experienced by the particles is: ' i where H i is the number of hits on the i th room surface. In ODEON, both of these mean absorption coefficients are inserted in the Sabine and Eyring formulae to calculate reverberation times; the classical values are labelled Sabine and Eyring, and the values using the modified mean absorption coefficient are labelled Modified Sabine and Modified Eyring. The mean absorption coefficients used for the Arau-Puchades formula are derived in similar ways except that separate values for surface hits, area and the corresponding mean absorption coefficients are calculated as projections onto each of the main axis of the room. The Sabine, Eyring and Arau-Puchades formulae require a value for the room volume, which ODEON estimates from the mean free path experienced by ray tracing, using the well-known relation for the mean free path in a 3-dimentional room: i 6-68 H i H i i
Page 1 and 2:
ODEON ROOM ACOUSTICS SOFTWARE Versi
Page 3 and 4:
ODEON Room Acoustics Software Versi
Page 5 and 6:
Introduction This manual is intende
Page 7 and 8:
SOFTWARE LICENSE AGREEMENT The foll
Page 9 and 10:
Contents Introduction .............
Page 11 and 12:
1 Installing and running the progra
Page 13 and 14:
applied to all surfaces. In these c
Page 15 and 16:
Update option Update to most recent
Page 17 and 18: 2 Short guided tours This chapter w
Page 19 and 20: Define a line source (Combined edit
Page 21 and 22: Define a receiver grid and calculat
Page 23 and 24: Single Point response receiver and
Page 25 and 26: defined before ODEON can calculate
Page 27 and 28: Point Response calculations The Poi
Page 29 and 30: Archiving project files in one sing
Page 31 and 32: Define a multi surface source Click
Page 33 and 34: Other facilities in ODEON Apart fro
Page 35 and 36: 2-34 Copenhagen Central Station Arr
Page 37 and 38: 3 Modelling rooms Creating new room
Page 39 and 40: Experiences from tests with the fir
Page 41 and 42: 3.2.2 ODEON Extrusion Modeller A sm
Page 43 and 44: The drawing has now been scaled and
Page 45 and 46: By checking Move all layers on laye
Page 47 and 48: To rotate a surface around a point
Page 49 and 50: BLOCK’s are not supported ODEON c
Page 51 and 52: Geometric rules, glue surfaces Surf
Page 53 and 54: 3.4.1 Viewing the room in a 3DView
Page 55 and 56: Surfaces are missing from the model
Page 57 and 58: 4 Materials This chapter covers mat
Page 59 and 60: Another option is to change the abs
Page 61 and 62: utton for finding material in the l
Page 63 and 64: 5 Auralisation (Combined and Audito
Page 65 and 66: frequency response inverse to that
Page 67: are simulating an ordinary stereo s
Page 71 and 72: The calculations carried out are di
Page 73 and 74: eflection order and up to the trans
Page 75 and 76: Scattering coefficient S s Surface
Page 77 and 78: oom; such as windows, doors, painti
Page 79 and 80: A last remark on Oblique Lambert is
Page 81 and 82: 6.9 Calculation method for Reflecto
Page 83 and 84: 7 Calculated Room Acoustical parame
Page 85 and 86: The calculated value of Lj(Average)
Page 87 and 88: 8 Calculation Parameters - Room Set
Page 89 and 90: Screen diffraction If this option i
Page 91 and 92: 9 Achieving good results The follow
Page 93 and 94: 9.1.3 Materials /absorption data Wr
Page 95 and 96: 10 Directivity patterns for point s
Page 97 and 98: inary and have the extension .SO8.
Page 99 and 100: An example; Full_Omni.dat on the fu
Page 101 and 102: 11 Line array sources This section
Page 103 and 104: 11.2 Playing with delay One advanta
Page 105 and 106: Figure 11-6. The radiation in octav
Page 107 and 108: Appendix A: References Affronides,
Page 109 and 110: Kristensen, J. (1984). Sound Absorp
Page 111 and 112: Appendix B: Vocabulary The techniqu
Page 113 and 114: Appendix C: Specify Transmission th
Page 115 and 116: Appendix D: Description of XML form
Page 117 and 118: Figure E3 Images of the Mono, Dipol
Page 119 and 120:
When developing export facilities f
Page 121 and 122:
InvertPhase="false" - If phase is i
Page 123 and 124:
speaker deliver 1W. The reason why
Page 125 and 126:
You may describe coordinates using
Page 127 and 128:
Example 1: Const CeilingHeight 3.4
Page 129 and 130:
As a special option for multi point
Page 131 and 132:
5411>5401 5512>5522 Elevation surfa
Page 133 and 134:
If an elevation surface has 22 surf
Page 135 and 136:
Name of counter to be used by the F
Page 137 and 138:
The UCS command is used to create a
Page 139 and 140:
As another option the colour of the
Page 141 and 142:
Width is oriented in the Y-directio
Page 143 and 144:
The Cone statement The Cone stateme
Page 145 and 146:
### Const N 16 Const W 10 Const H 3
Page 147 and 148:
Surf 2 ceiling 11 12 13 14 Surf 3 e
Page 149 and 150:
Surf 100 Circular floor 100>100+N-1
Page 151 and 152:
The window example shows how a cyli
Page 153:
Appendix G: Importing geometries -
show all

Download - Odeon

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?