Telecommunications: Encoding

Using bespoke conversion software, we can provide IVR voice prompts ready for use. Not only will they be optimised for your specific telephone system but they will sound great to your customers. 

Our attention to detail is paramount. The results depend on what you start with: our prompts are precisely edited, analysed, pre-filtered, and manually processed by specialist audio producers.

Fresh Air Studios are able to provide system-ready IVR voice prompt files in a wide range of formats and encoding algorithms.

Standard formats:

ITU-T (CCITT) Standards

G.711
Available in either A-law or mu-law µ-law
G.721
32 Kbps ADPCM, 4 bits at 8,000 samples/sec
G.726
40 Kbps ADPCM, 5 bits at 8,000 samples/sec
32 Kbps ADPCM, 4 bits at 8,000 samples/sec
24 Kbps ADPCM, 3 bits at 8,000 samples/sec
16 Kbps ADPCM, 2 bits at 8,000 samples/sec

Windows WAV files

Standard WAV files at a variety of sampling rates, 8 and 16bit.

Plus A-law, mu-law µ-law and non-standard windows encoding contained in a .wav file with header information.

Note: It is important to remember “.wav” stands mainly for wave-file rather than an actual encoding format. Hence, wav files can contain audio that cannot be played back on a standard PC unless the specific decoder is installed.

Proprietary, hardware and system specific formats including:

Bicom
4bit ADPCM

Centigram
32K ADPCM, 24K ADPCM, 16K ADPCM

Dialogic
Plus Dialogic OKI variants

Elan Informatique
(G.721 CCITT 32 KBps ADPCM variant)

Group 2000
OKI ADPCM at 6 or 8 KHz
A-law PCM
mu-law PCM µ-law

IBM Directalk

  

InterVoice
64K, 32K, 24K, and 16K A-law and mu-law ADPCM

Microlog Intela

Microsoft ADPCM

MP3
All bitrates, constant and variable

Natural Microsystems formats
Single prompt and multi-prompt files

NeXT/Sun
8 bits linear at 8KHz, 22.05 KHz, 44.1 KHz
16 bits linear at 8KHz, 22.05 KHz, 44.1 KHz
A-law at 8KHz, 22.05 KHz, 44.1 KHz
mu-law at 8KHz, 22.05 KHz, 44.1 KHz

Nortel Generations
A-law PCM
mu-law PCM µ-law
OKI ADPCM at 6 or 8 KHz

OKI

Philips VoiceManager
A-law PCM
mu-law PCM µ-law
OKI ADPCM at 6 or 8 KHz

PhoneBlaster
4 bits ADPCM at 7.2 KHz

Rockwell
4 bits ADPCM, 3 bits ADPCM and 2 bits ADPCM, all sampled at 7,200 samples/sec

SCII
G.723 CCITT 32 KBps ADPCM

Voicetek (Aspect)
32 KBps OKI ADPCM at 8 KHz
24 KBps OKI ADPCM at 6 KHz
A-law PCM
mu-law PCM µ-law

Need a wav converted to any of the above?

Commonly .wav to g.711 conversion (a-law or mu-law), or 44.1khz wav to adpcm .vox conversion - Ask about our specialist audio file conversion services.


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Fresh Air Studios