Headphones are a pair of small speakers that are worn on or over the ears, designed to provide audio output directly to the listener. They allow individuals to listen to music, podcasts, audio books, or any other sound sources without disturbing others nearby. Headphones come in various designs and types, including: 1. **Over-ear headphones**: These have large earcups that enclose the ears, providing good sound isolation and comfort for long listening sessions.
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Headphones are electroacoustic transducers worn at or near the ears that convert an electrical signal into local acoustic pressure variations. A two-channel pair can deliver different signals to the two ears. The relevant output is the sound pressure reaching the ear, which depends on the transducer, its placement and the surrounding acoustic geometry, not just the electrical input.
For a linear small-signal description, let be the input electric potential difference and the complex pressure amplitude at a specified ear location. A headphone transfer function describes both amplitude and phase. Two headphones can receive the same yet produce different ; even the same pair can produce different responses after being repositioned.[ref]
Variability in the characterization of the headphone transfer-function by Abhijit Kulkarni and H. Steven Colburn. Section I: transfer-function description from headphone input to a point in the ear canal.
Abhijit Kulkarni and H. Steven Colburn measured responses on a KEMAR acoustic mannequin with repeated placements of the headphone cushions. Placement-dependent variation complicated compensation by a fixed inverse filter. This experiment shows why a measurement needs a defined coupling arrangement: moving the device can change the acoustic system being calibrated.[ref]
Variability in the characterization of the headphone transfer-function by Abhijit Kulkarni and H. Steven Colburn. Abstract and introduction: tested supra-aural headphones, repeated placement and compensation problem.
For an illustrative amplitude example, if pressure doubles at a particular frequency while the reference pressure is unchanged, sound pressure level increases by decibels. That is a statement about pressure at the measurement point; it is not automatically a doubling of perceived loudness or a uniform change across frequencies. Headphone reproduction is therefore an electrical-to-mechanical-to-acoustic chain that must be assessed at its intended output location.