  Given an input sound signal and a target virtual sound source, sound
spatialisation algorithms manipulate the signal so that a listener perceives it
as though it were emitted from the target source. There exist several
established spatialisation approaches that deliver satisfactory results when
loudspeakers are used to playback the manipulated signal. As headphones have a
number of desirable characteristics over loudspeakers, such as portability,
isolation from the surrounding environment, cost and ease of use, it is
interesting to explore how a sense of acoustic space can be conveyed through
them. This article first surveys traditional spatialisation approaches intended
for loudspeakers, and then reviews them with regard to their adaptability to
headphones.
