Hi! We are in process of setting up an audio guide that will cover notable places of our capital Riga, Latvia. The target audience are tourists that dials a free phone number from a mobile handset to listen to a 3 minute introduction to historic place. All audio, 10+ languages are recorder in studio at 44KHz. The audio is stored on server in A-law 8KHz because we'll be pushing it through E1 line.
I need an advice on improving audio quality taking in account that callers will use cell phones that are most likely in 3G network coverage. So it means, I believe, either AMR NB or GSM EFR. Any hints on pre-filtering and volume normalization techniques that could be beneficiary in this case? Currently, a Sony Sound Forge speech preset -10dB is applied to normalize the volume (AFAIK) and then audio is re-sampled with SOX -t raw -e a-law -r 8000 -c 1 Free and commercial software recommendations are fine. It would be essential to get your comments (in email or by leaving a voice message) about sound quality if you could call the menu at sip:[email protected] (actually, any number at riga.beta.lv) I'm not a sound processing expert, nor I believe people performing the recording are IVR professionals. So please keep that in mind. It looks likes there are some problems with English and Norwegian languages. We also need a person who speaks Dutch language to perform a ~1h recording. This is price sensitive assignment because the project itself is close to non-commercial. 01 through 11 will select the language. Then 0000 through 0013 will select the place. You can press # to go up one level, and * will take you to 30sec feedback recording (only when you're listening to the guide or just right after that). Available languages are: 01=LV 02=EN 03=RU 04=DE 05=LT 08=NO 09=SE 10=PL 11=SP not yet ready 06=EE 07=FI 12=FR 13=IT 14=AR 15=CN 16=JP 17=IN -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
