http://www.synaudcon.com/irexch/files/dry_speech.zipThis page has been created to allow interested parties to exchange impulse responses (IR) of devices, systems, and spaces that they are working in. We ask that only original IRs be submitted, and that appropriate permission be obtained for any other submittals. Syn-Aud-Con makes no guarantees regarding this content and assumes no liability for its use or abuse.
Support Resources
The IRs can be played back in any wave editor. They can also be convolved with dry program material to see how it would sound if it were radiated and gathered in the same manner as the IR. A free convolution tool written especially for this purpose is GratisVOLVERTM. Here is a dry speech file (both 44K and 48K sample rates) for you to experiment with:
http://www.synaudcon.com/irexch/files/dry_speech.zip
Note that the sample rate of the dry file and the IR file must match, so use the dry file that has the same sample rate as the IR. If you wish to make your own IRs, you can do so with measurement software like SmaartLIVETM, WinMLSTM, EASERATM, and PraxisTM. These can directly record and process the IR. You can also gather IRs by simply making a recording of a reference file, and then using Praxis to extract the IR. Here are some reference files that can be used:
http://www.synaudcon.com/irexch/files/12_second.zip
Here is a raw recording that shows what the recorded file will look and sound like.
http://www.synaudcon.com/irexch/files/Sweep_sample.zip
This document provides instructions on how to process the recorded files in Praxis to recover the IR.
http://www.synaudcon.com/irexch/files/Praxis_routines.pdf
NEW!!! Use GratisVolver to Extract Impulse Responses!
This
PDF explains how.
And so does this one!
This zip file contains the required WAVs.
If you would like to submit IRs for inclusion on this page, please forward them to pbrown@synaudcon.comx (omit the "x"), along with some supporting information. You can browse the links below to see some items that will help users understand how your IRs were gathered.
Projects
Project 1 - Large House of Worship From Jerrold Stevens, PMK
A large HOW with a live acoustic environment, and a VRAS acoustic enhancement system. RIRs of the room and VRAS are included, along with some JPGs of the space.
http://www.synaudcon.com/irexch/files/PMK_IRs.zip
Project 2 - Auditorium From Lonn Hunter
Let me try to describe the space. The room is an auditorium that is rectangular in shape. The room is approx 135' x 75'. The measurements were made using a mono omni microphone, a Beyer Dynamic MM-1. Mic was placed about 5 feet above the floor. Imp#01 is placed in the middle of the second row in the audience. Imp#04 is about 50 rows back, also in the middle, which is about half way to the back of the room. Ceiling is 35 feet tall.
http://www.synaudcon.com/irexch/files/IRs_LH.zip
Project 3 - Domed Stadium From Kevin Day, WJHW
I have attached a "generic fabric roof domed stadium" IR file taken from a lower level seating section using an omni mic on a stand with the TEF20 and the house PA as a source. This is straight from the TEF machine. Notice all the trash and noise in the "tail" of the decay.
http://www.synaudcon.com/irexch/files/stadium_domed_KD.zip
Project 4 - Sports Arena From Kevin Day, WJHW
This is from an Arena with a domed roof made of pre-cast concrete sections. We have designed some acoustic treatments for the space and a new sound system that will drastically improve the perceived reverb time for the spectators. (Acoustic Mirror Sweep Method)
http://www.synaudcon.com/irexch/files/IR_arena_KD.zip
Project 5 - Medium-sized HOW From Pat Brown, Syn-Aud-Con
http://www.synaudcon.com/irexch/files/Q_comp_PB.zip
Project 6 - Medium-sized Traditional HOW From Pat Brown, Syn-Aud-Con
This is a comparison of a 2m line array and a two-way studio monitor at various distances in a reverberant space. The distance for TP1 is approx. 6m, TP2 is 12m, and TP3 is 20m.
http://www.synaudcon.com/irexch/files/IR_Line_SM_PB.zip
Project 7 - Small Lunch Room at Monastery Needing Acoustic Treatment From Buddy Ward, Jasper Music Center
This apartment-sized lunch room is very live and requires acoustical treatment. The IR and recordings were made for an acoustic materials supplier to aid in selecting appropriate acoustical treatment. The files include a RIR, a recording of live talker, a JPG of room, and a convolution made using the RIR.
http://www.synaudcon.com/irexch/files/StMeinrad_Lunchroom_BW.zip
Project 8 - Stereo vs. Mono Mic Technique From Pat Brown, Syn-Aud-Con
A studio monitor was measured at approximately one-half critical distance using both a mono and stereo microphone technique. This demonstrates the increased realism and envelopment that two-channel measurements provide.
http://www.synaudcon.com/irexch/files/bin_mono_compare.zip
Project 9 - House of Worship From Buddy Ward, Jasper Music Center
Several IRs of a small HOW, along with a speech recording. No additional information given. These are the first IRs on the exchange that were deconvolved with GratisVolver.
http://www.synaudcon.com/irexch/files/VTmpl_BW.zip
Project 10 - Fan-shaped House of Worship From Pat Brown, Syn-Aud-Con
This RIR was made near the front of a new 2000-seat fan-shaped auditorium. The dodec loudspeaker is on stage at the main lectern position. The microphone is in the front area, about 10m from the dodec. The file was made to document what people sitting near the front (and on stage) are hearing when a live talker is speaking from the main lectern. The sound system is turned "off." There is no treatment on the hard, concave rear wall.
http://www.synaudcon.com/irexch/files/IR_TP1_OCC_PB.zip
Project 11 - Multipurpose Room From Pat Brown, Syn-Aud-Con
Five RIRs of a multipurpose meeting hall, including a JPG of the room and the test positions. This semi-reverberant space has a complex ceiling shape, acoustical tile ceiling, and sheetrock parallel side walls. The floor is carpet on concrete.
http://www.synaudcon.com/irexch/files/SUMC_PB.zip
Project 12 - Church of Santi Luca and Martina, Rome From Francesco Martellotta, Politecnico di Bari (Italy) and Bengt-Inge Dalenback, CATT
The RIR was measured in a Baroque church with a greek-cross plan with a dome on the crossing. The room volume is about 9000 m3, and the floor area is 470 m2. Most of the surfaces are finished in plaster and richly decorated. Some of the windows were covered with velvet curtains. The dodec loudspeaker was placed in front of the altar, at the edge of the chancel area. The microphone was placed perfectly at the center of the church, under the dome.
http://www.synaudcon.com/irexch/files/Martelotta_IRs.zip
Project 13 - Faithpoint Church - Floyds Knobs, Indiana From Jeremy Johnston
All IRs collected with Shure VP88, stereo microphone; side level M, phantom supplied by CF recorder.
Microphone approximately at seated ear height (roughly 40" AFF). JPG of test positions included.
4 second 48K sweeps. Recorded direct to WAVE files on compact flash recorder. Deconvolved with GratsiVolver
http://www.synaudcon.com/irexch/files/Faithpoint.zip
Project 14 - Orange County Convention Center Meeting Room - Orlando, FL From Pat Brown
IRs collected at the front, middle, and rear tables of a meeting room setup for a class of 50. The IRs are of the main sound reinforcement loudspeaker, an Intellivox 1C. Note that the levels are normalized to zero, so only the direct-to-reverberant ratio should be compared for each position. The microphone was a stereo boundary mic, laid directly on the table at each position.
http://www.synaudcon.com/irexch/files/OCCC_NSCA05.zip
Project 15 - Assemblies of God of Tampere, Finland From Olli Rajala
A four-second, domed ceiling, 700 seat house of worship with installed sound system, due to be totally renovated later in the year. IRs were collected at mix position and two audience positions. The IRs were deconvolved from recordings of 12-sec swept sine waves using GratisVolver (see top of this page for more info on GV). Many photos included in the linked zip file.
http://www.synaudcon.com/irexch/files/WAVs_Olli_HOW.zip
Project 16 - St Pauls Episcopal Church From Paul Mondragon
Three IRs from a small, live HOW, including JPGs of the room.
http://www.synaudcon.com/irexch/files/St_Pauls.zip
Project 17 - Large Pavilion at Stage Fairgrounds From Pat Brown
A very large, hard space used for exhibitions, measuring approximately 60m x 100m x 10m. A portable medium-Q full-range loudspeaker was used to excite the space. The microphone was a stereo boundary mic at 16m and 32m.
http://www.synaudcon.com/irexch/files/BRP_Proj.zip
Project 18 - Faith Lutheran Church From Paul Mondragon
The room is smallish, and rectangular in shape, with a small balcony that seats about 25. The room is primarily hard with block walls, much wood, and a strip of carpet down the aisle. The platform is carpeted. There are MI boxes on TV brackets along with many small home theater speakers for "fills" at the balcony, under balcony, and stage. Sound is mixed from the rear under-balcony with equipment in a closet.
http://www.synaudcon.com/irexch/files/FaithLutheran.zip
Project 19 - Indoor Swimming Pool From Peter Patrick
This large swimming facility in Australia has no acoustic treatment. The resultant reverberation time is very long. The room is also quite noisy, measuring +60dBA, even under "quiet" conditions. Several JPGs are included with the IR
http://www.synaudcon.com/irexch/files/Pool.zip
Project 20 - LDS Conference Center
From Pat Brown
A 21,000+ seat auditorium - fan-shaped with large, open stage. It
has a relatively short RT for a room of this internal volume due to
extensive acoustical treatment. IRS were made at 8m, 16m, 30m, and 45m
using stereo mic and medium Q loudspeaker on stage.