A radio sweeper is a short, pre-recorded sample used by

radio station Radio broadcasting is transmission of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radi ...

s as segues between songs that give listeners a brief station identifier or promo, generally 20 seconds or less: "You're listening to the soft sounds of AMEradio. Easy listening throughout the Bay Area," for example. Dry radio sweepers are voice only—no music or sound effects—whereas wet sweepers generally contain sound FX (also known as "sonic", a global term for all sound effects and elements used in a sweeper.) Sweepers are also known as liners, bumpers, radio imaging, sweeps, station imaging, stingers, IDs, idents, promos, shotguns and intros. Most sweepers will have a

voice over Voice-over (also known as off-camera or off-stage commentary) is a production technique where a voice—that is not part of the narrative (non-diegetic)—is used in a radio, television production, filmmaking, theatre, or other presentations. ...

included on the audio.

References

Radio Imaging
Colourednoise.co.uk Radio terms
Miskaudio.com Radio broadcasting {{Radio-comm-stub