Best Codecs:
Speech (single speaker):
TOOLVOX-RT29HQ/3kbit/Mono -- 375bytes/sec = 1.4 meg/hour
Speech (multiple speakers): VQF 11kHz/8kbit/Mono
-- 1000bytes/sec = 3.6 meg/hour
Music/Speech (nice quality): VQF 22kHz/20kbit/Mono
-- 2500bytes/sec = 9 meg/hour
Music (near CD-quality):
VQF 44kHz/80kbit/stereo -- 10000bytes/sec = 36
meg/hour
Audio Tools (in order of excellence)
Toolvox provides the highest compression for speech:
If you like to listen to other very interesting stuff in
toolvox format click here
and follow the audio links.
SoundVQ/
TwinVQ offers the best compression for high quality audio:
-
Yamaha's time-limited Encoder
(there is a crack!)
and Player(..
no longer time limited! ... 1.3mB each)
-
Old Links: TwinVQ's original Encoder
and Player (1mB)
TwinVQ/SoundVQ is not in widespread use yet, but it simply is the best
compression.
MP3 is also worthwhile, mainly
because one can decode the file back to a WAV file. This may be useful
in order to compress it differently, once an even better compression comes
about.
Cool is a very good tool to
edit your sounds and also to save in Real-Audio.
ToolVox is the preferred compression if you just need the words to
be understood.
It takes almost any wav-file and encodes fairly fast, and make incredibly
small files: example (22k sample rate, 20kbit/sec)
TwinVQ/SoundVQ is the best allround compression. You may need to save
the WAV file as a 11kHz sample rate to get the best compression.
SoundVQ rates:
input 11kHz output 8kbit or 10kbit per channel
input 22kHz output 20kbit or 24kbit per channel
input 44kHz output 40kbit or 48kbit per channel
Links: WWW Audio Compression
FAQ
Realtime
speech and voice on the Internet
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