| Microsoft PCM |
Standard Windows WAV format for non-compressed
audio files. PCM (Pulse Code Modulation) is the standard
method of digitally encoding audio. It is the basic uncompressed
data format used in file types such as Windows .wav. |
| Microsoft 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. |
| NCT ALF2CD |
Compressed WAV format. ACM codec developed by
the NCT Company. Good for keeping of CD-quality music. |
| DSP |
Compressed WAV format. DSP Group True Speech
(TM) format. |
| GSM |
Compressed WAV format. Good for keeping of
human speech. |
| VOX Dialogic ADPCM |
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). |
| ALAW |
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. |
| ULAW |
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. |
| 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. |
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