Re: [Asterisk-Users] Sound file quality
On Mon, 9 Aug 2004, hank wrote: can you use .wav files or does it have to be gsm? I thought about that possibility too. Unfortunately I was not successful when putting .wav Files instead of gsm Files in /var/lib/asterisk/sound Which Formats will * accept and what extensions may be used ? Is there a page in the wiki about that ? Thanks for your help! Christoph ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Sound file quality
Christoph == Christoph Rothe [EMAIL PROTECTED] writes: Christoph Which Formats will * accept and what extensions may Christoph be used? Is there a page in the wiki about that ? Look in the formats dir in the asterisk src. Each of those formats can be used. They are well documented in terms of what file types and filenames they require. -JimC ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[Asterisk-Users] Sound file quality
I'm building a phone-in demo system to use for introducing Asterisk to prospective clients. One of the things I'm wary of is their likely preconceptions that VoIP systems will have poor audio quality. As a result, I'd like to ensure that the voice prompts I'm using have the best possible audio quality. Is it possible to use sound files at higher than 8kHz sampling? My callers will be coming in over PSTN to a VoIP gateway and then to me by uLaw/aLaw ... would higher sampling rates gain me anything in this configuration? -- David Gurr Congruity Ltd. Hemel Hempstead, UK ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Sound file quality
can you use .wav files or does it have to be gsm? - Original Message - From: Steven Critchfield [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, August 09, 2004 4:23 AM Subject: Re: [Asterisk-Users] Sound file quality On Mon, 2004-08-09 at 06:07, David Gurr wrote: I'm building a phone-in demo system to use for introducing Asterisk to prospective clients. One of the things I'm wary of is their likely preconceptions that VoIP systems will have poor audio quality. As a result, I'd like to ensure that the voice prompts I'm using have the best possible audio quality. Is it possible to use sound files at higher than 8kHz sampling? My callers will be coming in over PSTN to a VoIP gateway and then to me by uLaw/aLaw ... would higher sampling rates gain me anything in this configuration? PSTN is 8khz sample rate. So obviously a higher sample rate will not get you any where. -- Steven Critchfield [EMAIL PROTECTED] ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users My Inbox is protected by SPAMfighter 290 spam mails have been blocked so far. Download free www.spamfighter.com today! ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Sound file quality
hank wrote on 8/9/04, 12:10 PM: can you use .wav files or does it have to be gsm? See the wiki http://www.voip-info.org/tiki-index.php?page=Convert%20WAV%20audio%20files%20for%20use%20in%20Asterisk ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Sound file quality
David == David Gurr [EMAIL PROTECTED] writes: David As a result, I'd like to ensure that the voice prompts I'm David using have the best possible audio quality. David My callers will be coming in over PSTN to a VoIP gateway and David then to me by uLaw/aLaw ... The optimal quality in the case where pstn is involved would be from: Using pro-quality (which these days does not necessarily mean pro $$$) recording equipment Recording in DAT quality (16 bit 48 kHz) the recording equipment is more likely to support that than 16 kHz or 32 kHz 32bit float rather than 16 bit int is ok, too Edit the files at this point for lead time, trail time, equal volume, et al. Use a high quality resampling algorithm (in sox use polyphase) to resample to signed-16bit 8 kHz. Optionally use a band-pass filter here to drop stuff outside of the PSTN frequenc range. If you only do one of alaw/ulaw, you might as well convert the files to that, else leave them as signed-16bit You can still get things like phase distortion if the path has jitter and the receiver does not jitter-buffer. You will also need to do some experimenting to determine the optimal amplitude to avoid both clipping and too-little use of the available u/a-law bandwidth. -JimC -- James H. Cloos, Jr. [EMAIL PROTECTED] ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
