Reverb is crucial for the spatial impression. Audio without reverb leaves a flat auditory impression that does not reflect acoustic reality. For this reason, reverb and reverberation must be added to audio recordings.
In the past, reverberation was created by reverb springs or echo chambers, but today there are electronic reverberation devices for this purpose. The reverb spring was one or more spiral springs that were firmly connected to electromagnets. The magnets were activated by the signal to be reverberated. This caused the spiral springs to vibrate, which was picked up by sensors. The running time of the tapped signal depended on the length of the spring and its spring tension. The tapped, time-delayed signal was then mixed with the original signal, resulting in the reverb effect.
In electronic reverberators, the reverb effect is recreated using reverb processors and various algorithms.
According to the theoretical principles, reverberators have to include the different reflection types of the sound, the initial reflection and the diffuse reverberation in their calculations for the purpose of room simulation. In addition, special effects such as chorus, echo or compressor are used by the reverberation units to enrich their results. Reverberators work with digital signal processing( DSP) and are characterized by many editable parameters. These parameters can be used to perform precise room simulations.
The most important parameters of reverberators include the decay time, which is generally adjustable separately for high and low frequencies, the diffusion with which the number of reflections can be set, and the pre- delay for setting the initial reflection.