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Posted: Mon Oct 24, 2005 7:12 am
by firubbi
Hello all,
is it possiable to convert a wav file to this:
44.1khz,16bit, to pcm,A-law,8khz,64kbps.
i found A-law,8khz on Wavelab but didn't find pcm or 64kbps
need your advice.
thanks.
Posted: Mon Oct 24, 2005 8:31 am
by kybernaut_01
A-Law was originally developed for telephony. It is a "weighted" PCM codec optimized for voice transmission.
As far as I'm am aware, A-Law is a 8bit-only codec, so I wonder a bit about your requirements..?
Anyway, a 8.000 Hz mono a-law file has (per definition) 64kbit/s... So, at least that value is ok then.
kybernaut
Posted: Mon Oct 24, 2005 8:33 am
by kybernaut_01
in short: the file format output by WaveLab is correct
Posted: Mon Oct 24, 2005 8:39 am
by firubbi
Thank you kybernaut_01
Posted: Wed Oct 26, 2005 1:10 am
by firubbi
sorry again..
i need to convert 44.1khz wav to pcm,A-law,8khz,64kbps,mono and i did that but Now they(a phone company) want all those files with a extension of .pcm ! i'd rename few .A-law to .pcm but it sound all distorted.
need your advice.
thanks
Posted: Wed Oct 26, 2005 7:24 am
by kybernaut_01
On 2005-10-26 02:10, firubbi wrote:
sorry again..
i need to convert 44.1khz wav to pcm,A-law,8khz,64kbps,mono and i did that but Now they(a phone company) want all those files with a extension of .pcm ! i'd rename few .A-law to .pcm but it sound all distorted.
need your advice.
thanks
In what playback device does it sound distorted? The target device?
Be aware that when you try to open a file called xxx.pcm in WaveLab it doesnt know what to do with it and sets some standard values for sampling rate and bitdepth...(it is treated as RAW pcm without a header).
Posted: Wed Oct 26, 2005 9:03 am
by firubbi
In what playback device does it sound distorted? The target device?
No i'd changed the extantion by Wincommander than open the file by wavelab.
thanks
Posted: Wed Oct 26, 2005 9:40 am
by kybernaut_01
as I said...
wavelab treats a file with the extension .pcm as a RAW file and thus prompts you to specify the chracteristics (otherwise uses default values)...
BTW: I just tried what you said and it is not distorted...
good luck,
kybernaut