Meeting Topic: Impulse Response Utility Clinic
Moderator Name: Jim Naron
Speaker Name: Jason Robey (CRAS Instructor)
Other business or activities at the meeting: Bluebird Mic Raffle, Forensic Audio w Bryan Nuemeister.
Meeting Location: Conservatory of Recording Arts & Sciences 1205 N. Fiesta Blvd Gilbert Az 85233
In tonights meeting we started off by launching the impulse response utility application. Convolution reverb is not like any other reverb. Most reverbs are mathematical equation that the audio signal gets processed. This on the other hand is an actual sample that gets used in the application its self. Mr. Robes then proceeded to play a sample of a snare drum and showed off some sample reverbs he captured.
The application starts off by doing a room sweep, using sine waves. It uses a test tone of 20 Hz and starts to go up in frequency picking up the reflection of the sound. The steps to get the response captured is a very delicate and sensitive process. It is imperative that the levels are in check and do not clip. There has to be enough silence and obstructions need to be removed so the whole room is captured.
The equipment used in the clinic was nothing too expensive; just two microphones, preferably matched pair and a speaker with the widest range. There is no right or wrong way of setting up the equipment. As Mr. Robes mention, "To each their own," which makes sense, since there are a variety of ways to capture sound. He then presented many samples in his library which were captured around the school and in other places such as a garbage can. Also, the bath room and many other locations.
Written By: Jim Naron