Business Transcription and General Transcription includes: Individual speaker, Focus groups, Meetings, Recorded Statements or anything you have dictated that needs to be transcribed. GPAS uses Express Scribe software. We use two types of transcription: Edited for clarity and grammar, Verbatim(word for word). Compatible file extensions are listed below:
List of Audio File Formats
Open File Formats (supported by and most likely to work with our software)
- wav - standard audio file format used mainly in Windows PCs.
Commonly used for storing uncompressed (PCM), CD-quality sound files,
which means that they can be large in size - around 10MB per minute of
music. It is less well known that wave files can also be encoded with a
variety of codecs to reduce the file size (for example the GSM or mp3
codecs). A list of common wave file codecs can be found here. Sample .wav file.
- mp3 - the MPEG Layer-3 format is the most popular
format for downloading and storing music. By eliminating portions of
the audio file that are essentially inaudible, mp3 files are compressed
to roughly one-tenth the size of an equivalent PCM file while
maintaining good audio quality. We recommend the mp3 format for music
storage. It is not that good for voice storage. See here for a sample mp3 encoded wav file. Sample .mp3 file.
- ogg - a free, open source container format supporting a
variety of codecs, the most popular of which is the audio codec Vorbis.
Vorbis files are often compared to MP3 files in terms of quality. But
the simple fact mp3 are so much more broadly supported makes it
difficult to recommend ogg files. Sample .ogg file.
- gsm - designed for telephony use in Europe, gsm is a
very practical format for telephone quality voice. It makes a good
compromise between file size and quality. We recommend this format for
voice. Note that wav files can also be encoded with the gsm codec. See here for a sample gsm encoded wav file. Sample .gsm file.
- dct - A variable codec format designed for dictation.
It has dictation header information and can be encrypted (often
required by medical confidentiality laws). See here for a list of codecs supported in dct files. The standard dct player is the Express Scribe Transcription Player.
- flac - a lossless compression codec. You can think of
lossless compression as like zip but for audio. If you compress a PCM
file to flac and then restore it again it will be a perfect copy of the
original. (All the other codecs discussed here are lossy which means a
small part of the quality is lost). The cost of this losslessness is
that the compression ratio is not good. But we recommend flac for
archiving PCM files where quality is important (eg. broadcast or music
use). Sample .flac file.
- au - the standard audio file format used by Sun, Unix
and Java. The audio in au files can be PCM or compressed with the ulaw,
alaw or G729 codecs. Sample .au file.
- aiff - the standard audio file format used by Apple. It is like a wav file for the Mac. Sample .aif file.
- vox - the vox format most commonly uses the Dialogic
ADPCM (Adaptive Differential Pulse Code Modulation) codec. Similar to
other ADPCM formats, it compresses to 4-bits. Vox format files are
similar to wave files except that the vox files contain no information
about the file itself so the codec sample rate and number of channels
must first be specified in order to play a vox file. Vox a very old
file type and is pretty poor. We do not recommend it for anything
except for supporting legacy systems. Sample .vox file.
- raw - a raw file can contain audio in any codec but is
usually used with PCM audio data. It is rarely used except for
technical tests. Sample .raw file.
Proprietary Formats (supported by our software)
- wma - the popular Windows Media Audio format owned by
Microsoft. Designed with Digital Rights Management (DRM) abilities for
copy protection. Sample .wma file.
- aac - the Advanced Audio Coding format is based on the
MPEG4 audio standard owned by Dolby. A copy-protected version of this
format has been developed by Apple for use in music downloaded from
their iTunes Music Store. Sample .aac file.
- atrac (.wav) - the older style Sony ATRAC format. It always has a .wav file extension. To open these files simply install the ATRAC3 drivers. Sample .atrac file.
- ra - a Real Audio format designed for streaming audio
over the Internet. The .ra format allows files to be stored in a
self-contained fashion on a computer, with all of the audio data
contained inside the file itself. Sample .ra file.
- ram - a text file that contains a link to the Internet
address where the Real Audio file is stored. The .ram file contains no
audio data itself.
- dss - Digital Speech Standard files are an Olympus
proprietary format. It is a fairly old and poor codec. Prefer gsm or
mp3 where the recorder allows.
- msv - a Sony proprietary format for Memory Stick compressed voice files. You might need a Sony plugin to load this. Click here.
- dvf - a Sony proprietary format for compressed voice
files; commonly used by Sony dictation recorders. You might need a Sony
plugin to load this. Click here.
Formats not supported at this stage
- atrac (.oma, .omg, .atp) - the newer style Sony proprietary
format designed for minidisc use. It always has a .oma, .omg or .atp
file extension. It is similar to mp3 and probably only useful if you
are reading files from minidiscs or writing for minidiscs. Note most of
these files are rights managed so you cannot open them in any software
- mid - the midi file is not an audio file format at all. It is just a list of musical notes which a synthesizer can play.
- ape - the file format from Monkey's Audio is claimed to give about 50% compression without loss in audio quality.
DVD's are also accepted and must be in one of the file formats above.