Typical occurrences
Imagine you’re watching a video on YouTube but you can barely hear the speaker, so you crank up the volume. After the video you switch to your music player application to liste to your favorite band. Since you've increased the volume all the way, you ears are about to get blasted by your music (and probably your neighbors too).
Occasionally this also happens within one piece of media without interaction from the user. Think of a war movie that suddenly scales the loudness from a quiet conversation to a full blown combat screne.
It's also done on purporse, e.g. many commercials are intentionally louder than the shows they interrupt to grab the viewers' intention.
Causes
This happens because different audio sources are not normalized to use the same average or peak loudness. Different applications can also have different volume levels that are not normally synchronized.
What do you call it?
Now I'm looking for words that describe either of the following phenomena:
- [technical] the involuntary and enormous change in loudness caused by switching the input source (especially for an increase in volume)
- [psychological] the temporaryy shock that the listener suffers from such a harsh increase in loudness
Similar but not quite the same
The medical term audio shock is used when someone is traumatized by loud sounds and suffers serious and persistent consequences such as loss of hearing, vertigo, depression, etc. Regarding the psychological dimension, I'm rather looking for a word that describes the temporary "Man, that was loud!" effect.
Suggestions
Personally, I made up the word "audio bomb" and "volume switch shock" to refer to those moments. Any better words?
Best Answer
I would suggest:
(1) input gain mismatch or input gain shift. Since this is describing the technical aspect, the effect is caused by either of:
Switching to an input source with a different impedance, or pre-amp level output. The final amplification has no way to discern the amplitude increase that will result. Also contrinuting to this is that [now obsolete] mechanical contacts will arc as they seperate creating an input voltage spike "pop".
Variations in the headroom of recorded material. All analog signals are recorded to a scaled reference ranging from -infinity decibles to 0 decibels, with 0 dB being the "loudest". That is loudest in proportion to the amplifiers capability before going into saturation, or overshooting (+dB) the maximum capability of the amplifier to reproduce and amplify without distortion. A great recording should get close to 0dB headroom only on its loudest peak moments. Without care, another recording might have lots, or perhaps too much headroom, which will be distortion free, but have a limited dynamic range (difference bewtween the quitest and loudest passages)
(2) startled : cause (a person or animal) to feel sudden shock or alarm. "a sudden sound in the doorway startled her"