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[Acoustics] Lab 16: Reverberation Programs
Multi-effects processors or softwares have many different types of reverberation programs (or presets) pre-programmed into its memory. While artificially generated, many of them attempt to simulate the sonic profile of real spaces. You will be using one such program meant to simulate a hall space.
In this operation, you will be using your effects processor's reverberation section. You will put in an audio signal, call up one of the processor's reverb programs, and using your ears, determine the effect of changing the various parameters of the reverberation field. This should give you a working understanding of how to alter the sound of an artificial reverb program to simulate different spaces.
1) Select a Hall reverberation program.
2) Prepare to alter the Hall reverb program parameters.
3) Select the Reverberation Time parameter.
4) Change the Reverberation Time to 5 seconds. Listen for the effect.
5) Describe the change heard when you increase the reverb time to 5 seconds.
6) Change the Reverberation Time to 50 seconds.
7) Describe a possible use for this effect (very long reverberation time). The only way to judge the effect of the reverb is to allow a sound to energize the unit, and then remove it so that only the reverb remains.
8) Return the Reverb Time to its original setting.
9) Select the high frequency reverb time ratio. This parameter sets the ratio of high frequency to low frequency reverb time. In a natural room, the high frequency reverb time is always less than that at low frequencies.
10) Vary the high frequency reverb time ratio and listen to and look at the effect. Which setting gives the greatest apparent high frequency reverb time? _____
11) Describe the effect of the setting and the shape of the decay envelope that gives the greatest high frequency reverb time.
12) Select the early reflections density parameter.
13) Vary the early reflections density parameter and listen to and look at the effect. Which setting gives the thickest, richest sound? _____
14) Select the initial delay parameter. The parameter determines the amount of delay before the reverb program begins. In natual environments, there is always a delay prior to the onset of reverberation. The larger the room, the longer the initial delay.
15) Vary the initial delay parameter and listen to the effect.
16) Describe the effect of increasing the delay before reverb (initial delay) on the sound.
17) Select the high pass filter parameter. This parameter adjusts the amount of low frequency energy contained in the reverberant sound.
18) Increase the high pass frequency and listen to and look at its effect.
19) Describe the effect of raising the high pass filter frequency on the low frequency reverb time.
20) Select the low pass filter parameter. This parameter adjusts the amount of high frequency energy contained in the reverberant sound. This control can often be used to simulate "natural" reverb (which has a natural roll-off in the high frequencies).
21) Decrease the low pass frequency and listen to and look at its effect.
22) Select a low pass frequency that sounds "natural". This is a judgment call here. On a person's natural might be another's overly bright or dull. Use your own taste. There is no really wrong sound if you really feel it sounds "natural".
My choice of low pass frequency for "natural" sound is _____ kHz.
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