[asterisk-users] WAV file best sound quality

[Akpome Akpoguma]

Hi,I have been using wav files with sample rate of 8khz and 8 bits and I find the sound quality really poor.What is the best sound quality I can achieve on Asterisk?Responses would be appreciated.Rgds,Akpome
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[Matt]

8khz is not the best sampling rate, but that is the best you can do on the
PSTN. HOWEVER, you should be able to get fairly decent sound qualify out
of an 8khz sound file on the phone line. We have our IVR recorded at 8khz
and it sounds fine. Are you using any compression, or G711u/PSTN for your
trunks/phones?

Post by Akpome Akpoguma
Hi,
I have been using wav files with sample rate of 8khz and 8 bits and I find
the sound quality really poor.
What is the best sound quality I can achieve on Asterisk?
Responses would be appreciated.
Rgds,
Akpome
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[Akpome Akpoguma]

thanks for you response. Am using sip to access the sound files.The sound files are recorded with higher sampling rate and 'soxed'to 8khz on the IVR machine........... could it be that resampling is responsible for the degradation?Date: Wed, 13 Jun 2007 16:44:10 -0400From: ***@gmail.comTo: asterisk-***@lists.digium.comSubject: Re: [asterisk-users] WAV file best sound quality8khz is not the best sampling rate, but that is the best you can do on the PSTN. HOWEVER, you should be able to get fairly decent sound qualify out of an 8khz sound file on the phone line. We have our IVR recorded at 8khz and it sounds fine. Are you using any compression, or G711u/PSTN for your trunks/phones?
On 6/13/07, Akpome Akpoguma <***@hotmail.com> wrote:




Hi,I have been using wav files with sample rate of 8khz and 8 bits and I find the sound quality really poor.What is the best sound quality I can achieve on Asterisk?Responses would be appreciated.
Rgds,AkpomeChange is good. See what's different about Windows Live Hotmail.
Check it out!
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[randulo]

Post by Akpome Akpoguma
I have been using wav files with sample rate of 8khz and 8 bits and I find
the sound quality really poor.

8khz is correct, if you are using 8 bits, you need to use 16 bits if
I'm not mistaken.

[Matt]

Ahh I didn't see that in the first post. Yes Mr. SpamSucks is correct.
You should use 8khz @ 16bits. Using 8khz @ 8bits will sound like a drowning
goat under water.

Post by randulo

Post by Akpome Akpoguma
I have been using wav files with sample rate of 8khz and 8 bits and I

find

Post by Akpome Akpoguma
the sound quality really poor.

8khz is correct, if you are using 8 bits, you need to use 16 bits if
I'm not mistaken.
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[randulo]

Post by Matt
Ahh I didn't see that in the first post. Yes Mr. SpamSucks is correct.
goat under water.

I am a specialist in low bit width audio: My TRS-80 was able to input
audio for samlping through its cassette port, so 1-bit audio was born.
Handy for decoding Morse code or RTTY, no good for vmail or digital
audio music. :)