> [mailto:[email protected]] On Behalf Of Kevin P. > Fleming > > There were some comments in other replies about your files being 'quiet' > (low average volume level)... this won't help your situation at all, > because it means that any artifacts caused by resampling and > compression/decompression will end up at a relatively high amplitude > compared to the original signal (resulting in a low signal-to-noise > ratio), and when the listener increases the volume level on their > listening device, the noise level will be increased along with it. For > these sorts of tasks, you really do want the source material recorded at > a fairly high volume level. > On Fri, 15 Oct 2010, Danny Nicholas wrote:
> This appears to be the resolution to my problem - > > #1. Get my "recording talent" in an isolated environment so I can get > "clean, loud" recordings > > #2. Dump the Audacity and Audiologic steps and just use SOX with the > highpass and lowpass filters. 1) firstmenu.wav.wav is recorded so low, it just looks like line noise in Audacity. Unless you can re-record at a reasonable level, you're always going to be fighting this "sow's ear." 2) I use "normalize" (http://normalize.nongnu.org/) to normalize from the command line, but it does not deal with DC offset like Audacity will. Eliminating your DC offset issue should also be a goal of improving your recording environment. Newer (than provided with CentOS 5.5) versions of sox can do "dcshift." 3) Stick with ULAW or PCM (wav). You only have to be concerned with supplying audio encoded appropriately for the first hop in your delivery path. -- Thanks in advance, ------------------------------------------------------------------------- Steve Edwards [email protected] Voice: +1-760-468-3867 PST Newline Fax: +1-760-731-3000 -- _____________________________________________________________________ -- 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
