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Supported audio file formats
| Format |
Description |
Wave(PCM)
|
Standard Windows WAV format for
non-compressed audio files. Pulse Code Modulation (PCM) is the
standard method of digitally encoding audio. It is the basic
uncompressed data format used in file types such as Windows
.wav.
|
| MP3 |
MPEG Layer-3 format. Very popular
format for keeping of music. |
WMA
|
Windows Media Audio format. A
special type of advanced streaming format file for use with
audio content encoded with the Windows Media Audio codec. The
.wma extension indicates a file format and how the content is
encoded.
|
OGG
|
Ogg Vorbis format.
|
GSM
|
Compressed WAV format. Good for
keeping of human speech.
|
ADPCM
|
Compressed WAV format. ADPCM
(Adaptive Differential Pulse Code Modulation) is an audio compression
scheme which compresses from 16-bit to 4-bit for a 4:1 compression
ratio.
|
DSP
|
Compressed WAV format. DSP Group
True Speech (TM) format.
|
VOX
|
Dialogic ADPCM format. The Dialogic
ADPCM format is commonly found in telephony applications, and
has been optimized for low sample rate voice. It will only save
mono 16-bit audio, and like other ADPCM formats, it compresses
to 4-bits/sample (for a 4:1 ratio). This format has no header,
so any file format with the extension .VOX will be assumed to
be in this format.
|
G.721
|
Used for computer telephony.
Good for keeping of human speech.
|
G.723
|
Used for computer telephony.
Good for keeping of human speech.
|
G.726
|
Used for computer telephony.
Good for keeping of human speech.
|
| U_LAW |
Compressed WAV format.
u-Law (or CCITT standard G.711) is an audio compression scheme
and international standard in telephony applications. u-Law
is very similar to A-Law, a variation of u-Law found in European
systems. This encoding format compresses original 16-bit audio
down to 8 bits (for a 2:1 compression ratio) with a dynamic
range of about 13-bits. Thus, u-Law encoded waveforms have a
higher s/n ratio than 8-bit PCM, but at the price of a bit more
distortion than the original 16-bit audio. The quality is higher
than you would get with 4-bit ADPCM formats. Encoding and decoding
is rather fast and generally, widely supported.
|
A_LAW
|
Compressed WAV format. A-Law
(or CCITT standard G.711) is an audio compression scheme common
in telephony applications. It is a slight variation of the u-Law
compression format, and is found in European systems. This encoding
format compresses original 16-bit audio down to 8 bits (for
a 2:1 compression ratio) with a dynamic range of about 13-bits.
Thus, a-law encoded waveforms have a higher s/n ratio than 8-bit
PCM, but at the price of a bit more distortion than the original
16-bit audio. The quality is higher than you would get with
4-bit ADPCM formats. Encoding and decoding is rather fast and
generally, widely supported.
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