<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, Michael.<div><br></div><div>Thanks for posting this.</div><div><br></div><div>Have you considered using the higher quality sample rate conversion features in new versions of sox?</div><div><br></div><div>A starting place for info is here:</div><div><a href="http://sox.sourceforge.net/SoX/Resampling">http://sox.sourceforge.net/SoX/Resampling</a></div><div><br></div><div>Perhaps change:</div><div><br></div><div><blockquote type="cite"><span style="font-family: 'courier new', monospace; ">sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename</span><br style="font-family: 'courier new', monospace; "></blockquote><div><br></div><div>to:</div><div><br></div><div>sox <span class="Apple-style-span" style="font-family: 'courier new', monospace; ">$base_dir/$dir/$filename </span><span class="Apple-style-span" style="font-family: 'courier new', monospace; ">-c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename rate -v -I $rate dither</span></div><div><br></div><div><span class="Apple-style-span" style="font-family: 'courier new', monospace; ">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.</span></div><div><br></div><div>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.</div><div><br></div><div>Might produce slightly higher quality files, the next time it is necessary to regenerate them.</div><div><br></div><div>Bryan</div><div><br></div><div><div>On Jun 28, 2011, at 11:18 AM, Michael Collins wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">You can download the 48kHz files from <a href="http://files.freeswitch.org/">files.freeswitch.org</a>. 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:<br>
<br><span style="font-family: courier new,monospace;">base_dir="48000"</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">rates="48000 32000 16000 8000"</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">version="1.0.16"</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">voice="en-us-callie"</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">voice_dir="en/us/callie"</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">tar_path="../../.."</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">tmp_dir="tmp"</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">CWD=`pwd`</span><br style="font-family: courier new,monospace;">
<br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">for rate in $rates; do \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> mkdir -p $tmp_dir/$voice_dir</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> for dir in `ls $base_dir`; do \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> test -d $tmp_dir/$voice_dir/$dir/$rate || mkdir -p $tmp_dir/$voice_dir/$dir/$rate; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> for filename in `ls $base_dir/$dir`; do \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> echo sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> sox -v 0.2 $base_dir/$dir/$filename -r $rate -c 1 $tmp_dir/$voice_dir/$dir/$rate/$filename; \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> done ; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> done ; \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> cd $tmp_dir</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> echo tar -cvzf $CWD/$tar_path/freeswitch-sounds-$voice-$rate-$version.tar.gz *; \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> tar -cvzf $CWD/$tar_path/freeswitch-sounds-$voice-$rate-$version.tar.gz *; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> cd -</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> rm -rf $tmp_dir</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">done</span><br style="font-family: courier new,monospace;"><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">cd $tar_path</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">for rate in $rates; do \</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> openssl dgst -sha1 freeswitch-sounds-$voice-$rate-$version.tar.gz > freeswitch-sounds-$voice-$rate-$version.tar.gz.sha1 ; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> openssl dgst -md5 freeswitch-sounds-$voice-$rate-$version.tar.gz > freeswitch-sounds-$voice-$rate-$version.tar.gz.md5 ; \</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">done</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">cd $CWD</span><br style="font-family: courier new,monospace;">
<br>Let me know if you have any suggestions.<br>-MC<br><br><div class="gmail_quote">On Mon, Jun 27, 2011 at 8:25 PM, Bryan Smart <span dir="ltr"><<a href="mailto:bryansmart@bryansmart.com">bryansmart@bryansmart.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div style="word-wrap:break-word">-v is a multiplier. So, -v 0.2 reduces gain to 20% of original.<div><br></div><div>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.<br>
<div><br></div><div>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?</div>
<div><br></div><div><font color="#888888">Bryan<br><div><br></div></font><div><div><div><div></div><div class="h5"><div>On Jun 27, 2011, at 7:32 PM, Michael Collins wrote:</div><br></div></div><blockquote type="cite"><div>
<div></div><div class="h5"><br><br><div class="gmail_quote">On Mon, Jun 27, 2011 at 3:07 PM, Anthony Minessale <span dir="ltr"><<a href="mailto:anthony.minessale@gmail.com" target="_blank">anthony.minessale@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-width:1px;border-left-color:rgb(204, 204, 204);border-left-style:solid;padding-left:1ex">
Have a look at the 48khz versions of the files, those should be the originals.<br>
Someone runs a batch sox command on them to get them to the other levels.<br></blockquote><br></div>Just for the record, the sox command used to normalize the sounds is:<br>sox -v 0.2 $file_in -r $rate -c 1 $file_out<br>
<br>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.<br>
<br>-MC <br></div></div><div class="im">
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