[Asterisk-Users] Digium TheVoice recordings' sound terrible

[Race Vanderdecken]

Greetings Ben,

	If you have not gotten your answer yet;

	Converting audio files from WAV to telephone 3000HZ will always
cause a degradation of the audio quality. Could you elaborate on " they
sound
really bad " please? 

	I would take the .gsm files that Digium produced or converted
from the .WAV files and play them back on the Windows machine and then
compare that quality to the WAV on the Windows box.

	The .gsm should sound the same on the windows box as on the
phone. If the quality is worse then contact Digium.

	I used http://www.audioi.com/ 'Audio Converter and Ripper' to
convert .wav to .gsm.  On playback the .gsm has good fidelity. On the
phone, we are using a Cisco 7200 and not Asterisk for play back, the
quality is the same.

	Make sure you are converting correctly, 16bit 8000hz Mono, for
gsm g729.

	1. convert the .wav to .gsm using "Audio Converter and Ripper",
shareware.
	2. play the .gsm and compare to the .wav.

	3 play the .gsm and compare to results from the phone.

	4. if there is much difference check the phone AUDIO CODECS in
asterisk, you might be converting from GSM to G729 on the fly ( I know,
technically only a slight difference.) Do you have the G729 license from
Digium installed?

	5. make sure the conversion process was done correctly. 16bit,
8000hz per sample, Mono.

	
Race Vanderdecken

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Benjamin
on Asterisk Mailing Lists
Sent: 24 October 2004 06:38
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Digium TheVoice recordings' sound terrible

A customer has ordered some voice prompts from Digium's TheVoice
online store. They say the recordings' sound was good when they
listened to it on their Windoze boxes. However, then Asterisk is
playing back the recordings, the volume is far too high and they sound
really bad. This is particularly noticeable since the IVR menu mixes
those ordered recordings with recordings that are already part of the
Asterisk distribution. The volume of the included recordings are much
lower and they sound much better than the ordered recordings.

I wonder why Digium would deliver recordings that differ so much from
the included set of recordings.

However, the format the customer ordered was WAV, whereas all the
included recordings are of course GSM. Has anybody had similar
experiences? I tried to convert the WAV files to GSM using sox but
since I don't know what parameters are best in this case, the results
weren't satisfactory. Any suggestions?

thanks
rgds
benjk
-- 
Sunrise Telephone Systems, 9F Shibuya Daikyo Bldg., 1-13-5 Shibuya,
Tokyo, Japan.

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