Compatible phone systems have a physical or virtual port which allows audio playback to users on hold.
Video and audio playback were originally mastered to laserdisc.
PortAudio is an open source computer library for audio playback and recording.
On the other hand, some audio players may be built around drives with more than the basic intelligence required for audio playback.
Battery life was reported to last for up to 3 hours of video and 6 hours of audio playback.
His 1979 prototype was capable of approximately one hour of audio playback but it did not enter commercial production.
The new facilities included state of the art computer integration, including software controlled transmitters and audio playback from hard disk.
The stroboscopic effect also plays a role in audio playback.
According to several sites there have been early complaints of a high-pitched whine during audio playback through the headphones.
They have a range of 30 feet, built-in controls for audio playback and can take phone calls.