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2. Reverberation - Wikipedia

   en.wikipedia.org/wiki/Reverberation

   Reverberation time is a measure of the time required for the sound to "fade away" in an enclosed area after the source of the sound has stopped. When it comes to accurately measuring reverberation time with a meter, the term T 60 [ 6 ] (an abbreviation for reverberation time 60 dB) is used.

3. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   A reverberation chamber is used to test the sound absorption coefficients and NRC of a material. The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency ...

4. Audio feedback - Wikipedia

   en.wikipedia.org/wiki/Audio_feedback

   To maximize gain before feedback, the amount of sound energy that is fed back to the microphones must be reduced as much as is practical.As sound pressure falls off with 1/r with respect to the distance r in free space, or up to a distance known as reverberation distance in closed spaces (and the energy density with 1/r²), it is important to keep the microphones at a large enough distance ...

5. Orchestral enhancement - Wikipedia

   en.wikipedia.org/wiki/Orchestral_enhancement

   Some architectural modifications such as the addition of drapery or plush fabric bunting are used to reduce unwanted reverberation in the hall. Other modifications, such as the installation of acrylic glass screens, can be used to reduce the volume of loud instruments such as trumpets, cymbals, a drum set, or an electric guitar amplifier.

6. Acoustic plaster - Wikipedia

   en.wikipedia.org/wiki/Acoustic_plaster

   The Noise Reduction Coefficient (NRC) determines the ability of a material to reflect or absorb sound. [5] It is a number between 0 and 1, which 0 being perfectly reflective and 1 being perfectly absorptive. [5] The application of acoustic plasters helps to increase the intelligibility of voice, music, and other sounds under desirable environment.

7. Fade (audio engineering) - Wikipedia

   en.wikipedia.org/wiki/Fade_(audio_engineering)

   Because of the initial drop in perceived volume, the linear shape is ideal if there is a natural ambience or reverb present in the audio. When applied it shortens the ambience. Also if the music requires an accelerating effect, this linear curve can also be applied. This type of fade is not very natural sounding.

8. Wow and flutter measurement - Wikipedia

   en.wikipedia.org/wiki/Wow_and_flutter_measurement

   While wow is perceived clearly as pitch variation, flutter can alter the sound of the music differently, making it sound ‘cracked’ or ‘ugly’. A recorded 1 kHz tone with a small amount of flutter (around 0.1%) can sound fine in a ‘dead’ listening room, but in a reverberant room constant fluctuations will often be clearly heard.

9. Dereverberation - Wikipedia

   en.wikipedia.org/wiki/Dereverberation

   Dereverberation of audio (speech or music) is a corresponding function to blind deconvolution of images, although the techniques used are usually very different. Reverberation itself is caused by sound reflections in a room (or other enclosed space) and is quantified by the room reverberation time and the direct-to-reverberant ratio. The effect ...