[Freeswitch-users] Proper prompt gain/level

[Michael Collins]

I will give this a whirl and see what happens. I have no problems trying
that out.
-MC

On Tue, Jun 28, 2011 at 7:12 PM, Bryan Smart <bryansmart at bryansmart.com>wrote:

> 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. 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 at 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 at 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 877-7-4ACLUE
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> 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 at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> 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 at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> 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 at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20110629/9bceaa07/attachment.html