Reverberation, commonly known as reverb, refers to as the persistence of a sound after the specific sound has been produced. Reverb is created when a signal is reflected, causing several reflections to build up. When this happens, the signal decays as the sound is absorbed by the different surfaces within a space.
Reverberation is frequency-dependent and it occurs naturally when people talk, sing, or play a musical instrument inside a sound-reflective area. The sound of reverb is typically added to vocals and musical instruments in an artificial way. This process is usually done for live sound systems and sound recordings. It’s worth mentioning that reverberation can add a sense of space, and it can also reduce speech intelligibility when unwanted noise is present.
There are several techniques that are capable of measuring reverb times. The most common one is the Schroeder method, which involves impulse excitation using interrupted noise with either a built-in noise generator or a balloon or pistol burst.
Reverb effects can be created. Both performers and producers use reverberation within live or recorded music. There are several techniques that produce or mimic the reverb effect, such as chamber reverberators, plate reverberators, spring reverberators, and digital reverberators.
Chamber reverberators were one of the first reverb effects methods, but it is not typically used nowadays since it requires a soundproofed room. Plate reverberators involve an electromechanical transducer to create vibrations in a large plate of sheet metal. Spring reverberators use a transducer at one end of the spring and a pickup at the other end. When this is assembled, vibrations are created and captioned within a metal spring. Digital reverberators use signal processing algorithms to create the reverb effect. Advanced digital reverberators are capable of mimicking the time and frequency domain response of a particular space.