Originally posted by: Muse
I think maybe two people told me that I could accomplish the same thing by use 32 khz sampling rate, but maybe what you say is true. Thing is I'm using Total Recorder 3.4 and AFAIK, there's no way I can set up frequency cutoffs with the LAME encoder within Total Recorder. The resulting MP3s don't sound crappy to me. I'll try to find a way I can configure for the cutoff but I'm not optimistic about that. In any case, I imagine that since there's really no signal being received for anything over 15 khz in the high treble, I assume that the LAME encoder isn't wasting any bits recording any. Make sense?Originally posted by: Nefrodite
So far the MP3s I've been encoding are my radio shows via Total Recorder. It's 2.5 continuous hours once a week and TR has scheduling so all I need to do is turn on my receiver and my computer. I used to record on normal bias cassettes (until a couple weeks ago) and to my ears so far, 128 kbps at 32 khz sampling rate sounds pretty good. FM only extends to about 15 khz so I'm told that 32 khz will give me as much as 44 khz. Even so, my files are around 145 MB. Now if I encoded at 192 or something like that my files would be much bigger. Is this sacrilege?
i think 32khz for mp3s is sampling rate, not signal frequency. so setting it at 32khz does not match fm, it only makes your recording cr@ppier. if you want to limit the frequency range the mp3 encoder deals with, low pass high pass filter settings for lame do that. but at 128kbs recording for fm, standard settings are just fine. use 44khz
The max frequency response of a sampling rate is half the sample rate and even at this range things are distorted because at half the sample rate the only wave you can represent is a square wave. At half THAT frequency it looks more like a triangle, and maybe half THAT frequency it actually starts looking like a sine wave.
So at 44100 you have a max frequency response of 22050hz, with distortion starting to get bad above 11025hz (but because this is high frequency, many people don't notice) and with some distortion (but not a whole lot) above 6012hz.
If you use 32000hz your max frequency response is now 16000hz, distortion getting bad above 8000hz and with some starting at 4000hz. You just crappified all of the frequencies above 4000.