Talk:Sample Rates

Q: ''I recorded a track at 44k sample rate. Since content doesn't go above 6kHz I'd like to export it at 16kHz sample rate mp3 - how do I do this?'' NT 15:58, 20 October 2007 (PDT)

A: You know how to export MP3 of course - Lame Installation? Set the 16 000 Hz in the Project Rate box bottom left of the Audacity screen. Maximum possible bit rate with 16 000 Hz sample rate is fixed (in MP3 specification) at 160 kbps.

Gale

Yes I tried that already, it just played the track back at 16/44 times the speed.NT 13:35, 21 October 2007 (PDT)

Are you sure you did not change the sample rate at Set Rate in the Track Popdown Menu

as that would change the speed? You want the box that says "Project Rate". That does not change the speed.

Gale

Hi Gale.

I changed 'set rate', but I cant find 'project rate' anywhere. Where should i be looking? I'm using 1.2.6.

Thanks NT 03:15, 22 October 2007 (PDT)

Hi NT

The "Project Rate" in 1.2.6 is a small button with a pop-up at bottom left of the screen:

Don't you see that? Are you on Linux, if so have you installed from an rpm package?

ahhh, ty :) NT 10:43, 22 October 2007 (PDT)

Some rates greyed out
Q:If I click the bottom left sample rate button in 1.2.6, some rates are greyed out. Yet if I enter the rate by hand (clicking 'other') it works. Why is it doing this? NT 18:52, 31 October 2007 (PDT)

A: If a rate in the dropdown is greyed out, it means your sound device is reporting that rate to be unsupported. Playback and recording will be resampled to the nearest supported rate above.

Gale

Thanks NT 17:08, 2 November 2007 (PDT)

48kHz
There should be a brief discussion of 48kHz under Which Sample Rate To Use because that is the sampling rate of video DVDs and Blu-ray discs (with 16 bit depth). This is a consideration when recording and editing soundtracks for video projects. YouTube also suggests 48kHz (or even 96 kHz, under Help/Encoding videos/Advanced encoding specifications). The same Audacity project can always be exported at 44.1 kHz for burning audio CDs.

Preservationist