Hi, Michael. Thanks for posting this. Have you considered using the higher quality sample rate conversion features in new versions of sox? A starting place for info is here: http://sox.sourceforge.net/SoX/Resampling Perhaps change: sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename to: sox $base_dir/$dir/$filename -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename rate -v -I $rate dither rate -v -I $rate: Replaces -r $rate. Uses the newer "very high quality" mode (instead of "high quality") with Intermediate Phase response (instead of linear). This setting is superior to the default, but slower to process. dither: Applies basic triangular dithering. There are other dithering strategies, but, based on what I've read and experienced, they aren't as useful when down-sampling to low rates. Might produce slightly higher quality files, the next time it is necessary to regenerate them. Bryan On Jun 28, 2011, at 11:18 AM, Michael Collins wrote: You can download the 48kHz files from files.freeswitch.org<http://files.freeswitch.org/>. The script itself is nothing special - all it does is cycle through the target sampling rates and run each file through sox. Here's a copy of the script: base_dir="48000" rates="48000 32000 16000 8000" version="1.0.16" voice="en-us-callie" voice_dir="en/us/callie" tar_path="../../.." tmp_dir="tmp" CWD=`pwd` for rate in $rates; do \ mkdir -p $tmp_dir/$voice_dir for dir in `ls $base_dir`; do \ test -d $tmp_dir/$voice_dir/$dir/$rate || mkdir -p $tmp_dir/$voice_dir/$dir/$rate; \ for filename in `ls $base_dir/$dir`; do \ echo sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename; \ sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename; \ done ; \ done ; \ cd $tmp_dir echo tar -cvzf $CWD/$tar_path/freeswitch-sounds-$voice-$rate-$version.tar.gz *; \ tar -cvzf $CWD/$tar_path/freeswitch-sounds-$voice-$rate-$version.tar.gz *; \ cd - rm -rf $tmp_dir done cd $tar_path for rate in $rates; do \ openssl dgst -sha1 freeswitch-sounds-$voice-$rate-$version.tar.gz > freeswitch-sounds-$voice-$rate-$version.tar.gz.sha1 ; \ openssl dgst -md5 freeswitch-sounds-$voice-$rate-$version.tar.gz > freeswitch-sounds-$voice-$rate-$version.tar.gz.md5 ; \ done cd $CWD Let me know if you have any suggestions. -MC On Mon, Jun 27, 2011 at 8:25 PM, Bryan Smart <bryansmart@bryansmart.com<mailto:bryansmart@bryansmart.com>> wrote: -v is a multiplier. So, -v 0.2 reduces gain to 20% of original. It is typical to supply professionally recorded audio with peaks boosted to 0DBFS. That is probably how the prompts were originally supplied. It makes since that -v 0.2 would reduce the max power to 20%, around -15 to -16 DBFS. The FS build process downloads pre-processed versions of these files. Is there somewhere online that I can find the source recordings+script that produces the pre-processed files that are downloaded by the build process? Bryan On Jun 27, 2011, at 7:32 PM, Michael Collins wrote: On Mon, Jun 27, 2011 at 3:07 PM, Anthony Minessale <anthony.minessale@gmail.com<mailto:anthony.minessale@gmail.com>> wrote: Have a look at the 48khz versions of the files, those should be the originals. Someone runs a batch sox command on them to get them to the other levels. Just for the record, the sox command used to normalize the sounds is: sox -v 0.2 $file_in -r $rate -c 1 $file_out The -v format is the "volume" format and if I read the sox man page correctly it means a "linear amplitude adjustment". What I can't tell from the man page is whether .2 means "reduce by 20%" or "reduce to 20%" or something else. In any case, like Tony says, we are not picky about this as long as it's not pointlessly loud. -MC _______________________________________________ Join us at ClueCon 2011, Aug 9-11, Chicago http://www.cluecon.com<http://www.cluecon.com/> 877-7-4ACLUE FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org<http://www.freeswitch.org/> _______________________________________________ Join us at ClueCon 2011, Aug 9-11, Chicago http://www.cluecon.com<http://www.cluecon.com/> 877-7-4ACLUE FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org<http://www.freeswitch.org/> _______________________________________________ Join us at ClueCon 2011, Aug 9-11, Chicago http://www.cluecon.com 877-7-4ACLUE FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org