Audio Ease - BarbaBatch - Supported Filetypes - Dialogic Vox
The Dialogic file types are standards for telephony applications such as voice response systems. BarbaBatch supports four different Dialogic file types:
Only two sample rates are allowed in these file types: 6000 Hz and 8000 Hz. Dialogic ADPCM files are the smallest and offer the best quality of the four.
It is important to know that these file types have no header, which means that for a player application there is no way to determine what kind of file it is. That is why in order to be able to playback these files, they need to be identified by their filename extension. BarbaBatch will automatically suggest the appropriate extension for playback when you make your Conversion Definition.
.AP8 Dialogic ADPCM at 8000 Hz (32 kbits per second throughput)
.AP6 Dialogic ADPCM at 6000 Hz (24 kbits per second throughput)
.UL8 Dialogic µ-law at 8000 Hz (64 kbits per second throughput)
.UL6 Dialogic µ-law at 6000 Hz (48 kbits per second throughput)
.AL8 Dialogic a-law at 8000 Hz (64 kbits per second throughput)
.AL6 Dialogic a-law at 6000 Hz (48 kbits per second throughput)
.PCM Dialogic PCM files can be converted to any sample rate or word size.
in BarbaBatch, however, they always are read as being 8 bits 8 kHz mono by BarbaBatch.
Please note that these filename extensions are by no means a standard in the industry, they are merely for BarbaBatchs convenience. Normally you will need to supply files with the standard extension .VOX or with no extension at all. If you receive Dialogic files for conversion with BarbaBatch you should add the right suffix to their names using NameIt.
Generally a high perceived level is needed from these files as well as a dramatically low dynamic range. We suggest you use the BarbaBatch look ahead peak limiter in conjunction for this conversion with a setting like this: