Dialogic ADPCM or VOX is an audio file format, optimized for storing digitized voice data at a low sampling rate. VOX files are most commonly found in telephony applications, as well as an occasional arcade redemption game. An audio file format is a container format for storing audio data on a computer system. ... Digitized is a method of creating sprites to games using live video footage. ... The sampling frequency or sampling rate defines the number of samples per second taken from a continuous signal to make a discrete signal. ... In telecommunication, Telephony encompasses the general use of equipment to provide voice communication over distances. ... Redemption games are typically arcade games of skill that reward the player proportionally to their score in the game. ...
Similar to other ADPCM (Adaptive Differential Pulse Code Modulation) formats, Dialogic ADPCM compresses audio data into a series of 4-bit samples. Dialogic ADPCM files can have a sampling rate of 6000 or 8000 samples per second, but 8000 samples per second (8000Hz) is more common. Unlike a WAV file, a VOX file does not contain a header to specify the encoding format or the sampling rate, so this information must be known in order to play the file. If not known, it is normally assumed that a VOX file is encoded with Dialogic ADPCM at a sampling rate of 8000Hz. It is possible that a VOX file may be encoded in a format other than Dialogic ADPCM, but this is not common. Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. ... Audio compression is a form of data compression designed to reduce the size of audio files. ... WAV (or WAVE), short for Waveform audio format, is a Microsoft and IBM audio file format standard for storing audio on PCs. ...
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