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--- covolution_reverb_and_irs [2020/01/12 05:42] – [Varieties] rs2000
+++ covolution_reverb_and_irs [2022/06/19 00:18] (current) – espiegel123
@@ Line 1: / Line 1: @@
 ====== Convolution Reverb and IRs (Impulse Responses) ======
+The idea behind convolution reverb based on impulse responses is to emulate the placement and recording of a sound source in a real physical space.
+Decades ago, one would have had to move the sound source into that space (a small room, a live stage, a concert hall, a church or simply set up a loudspeaker cabinet) and set up all the required recording equipment.
+Since the invention of IR-based convolution, that process has become a matter of providing the sound to process, the impulse response and software that is able to do the mathematical convolution of both input signals.
+How are IRs recorded?
+You can read more about the process here (link as of January 2020):
+https://en.m.wikipedia.org/wiki/Convolution_reverb
+A more technical description with details can be found here (link as of January 2020):
+https://sourceforge.net/p/hesuvi/wiki/How-To%20Record%20Impulse%20Responses%20Digitally/
 ===== Varieties =====
 Convolution reverbs can use impulse responses (often just referred to as IR or IRs) in different ways.
@@ Line 23: / Line 34: @@
 The left and right input channels are mixed to mono and then independently convolved with the left and right impulse response file channels. When using a single stereo impulse response file, this is useful when input audio is panned hard left or right; this configuration is often encountered in low/medium-end stereo algorithmic reverbs.
-(Source URL January 2020: https://www.liquidsonics.com/knowledge-base/reverb-processing-topologies/)
+(Source URL from January 2020: https://www.liquidsonics.com/knowledge-base/reverb-processing-topologies/)
 ===== Tips and Tricks =====
 ==== Non-reverb uses ====
-Convolution reverbs can be used to interesting effect when you use non-IR (impulse response) files instead of impulse responses. You can use it as a sort of spectral processor to impose the harmonics of one sound on another. Note that since convolution is basically the multiplication of the signal spectrum with the IR spectrum, convolution cannot add harmonics that aren't present in the source signal.
+Convolution reverbs can be used to interesting effect when you use non-IR (impulse response) files instead of impulse responses. The convolution acts as a sort of spectral filter. The result is that the source sound is "filtered" with the file you as the IR. Since convolution is basically the multiplication of the signal spectrum with the IR's spectrum, it cannot add harmonics that aren't present in the source signal.
 A quick demo of a decidely non-reverb application of convolution
 {{youtube>Ylk6_grPsHY}}
+==== Tutorial & Tips ====
+=== Cabinet IR Tips ===
+There is general agreement that high-quality cabinet IRs (such as those from OwnHammer) improve the results that you will get with even the best guitar and bass amp simulations. This section provides tips for people using cabinet IRs.
+Many people find that the OwnHammer rEvolution provides a great collection of IRs that cover everything from 1x12 to 4x12 cabinets. That bundle includes a huge number of variations (these are geared towards recording engineers that are interested in replicating particular mic positioning). Schmootown provided [[https://forum.audiob.us/discussion/comment/839352/#Comment_839352 | great tips]] for extracting a manageable small collection that will satisfy most people's needs (even total guitar nerds). JoyceRoadStudios provides [[https://forum.audiob.us/discussion/comment/868287/#Comment_868287 | more great tips]] in this post.
+DaveyPoo's [[https://forum.audiob.us/discussion/40534/the-great-hunt-for-virtual-guitar-tone-daveypoo-the-mobile-music-minstrel/p1 | video and thread about getting great guitar tone]] (and the ensuing discussion) are worthwhile.
+How to Import Import Ownhammer Cabinet IRs into THAFKNAR or Impulsation
+{{youtube>k9vHRo5nVSA}}
 ===== Downloads =====
 Some IRs can be found for download on the following pages:
+  * [[https://www.openairlib.net/|OpenAIR]] - a large library of public domain impulse responses. The site includes detailed data about the sites where the IRs were captured and example recordings that let you hear how the IR will sound.
   * [[https://web.archive.org/web/20190201211631/http://www.samplicity.com/bricasti-m7-impulse-responses/|Samplicity True Stereo IRs]] (on the Wayback Machine)
   * [[http://www.echothief.com|EchoThief]] - a library of free IRs
+  * [[https://www.youtube.com/watch?v=EDjaSMgp9_w|Pool of the Black Star]] - This Hainbach video about an interesting reverberant space includes a link to impulse responses captured there.
 ===== Stub =====