On Wed, 5 Feb 2014 09:36:37 -0600 Matt Garman <matthew.garman@xxxxxxxxx> wrote: > > I have a collection of FLAC files, all ripped from my CD collection > What I would like to do is run an analysis across all the music to > determine how the bass/lower frequencies are generally mixed. For > example, how much content below (for example) 150 Hz is on the left > channel versus the right channel? > > I'm not sure if "histogram" is the right word, but in my mind what > I'd like to see, per-channel, is something like this: > > 150--125 Hz: x samples > 125--100 Hz: y samples > 100--80 Hz: z samples > ... > > Then I can look at the two channels of a song, and if the histograms > are approximately the same, I can assume the bass was mixed equally > to both channels. > > I am a programmer, and thought it would be easy to quickly hack > something up that would do this, but I have no experience with > signal processing, and as I started reading about this, I quickly > got in over my head! So I was hoping there might already exist a > tool that has this functionality. One thing to note: According to my understanding you won't get accurate sample counts here. To do frequency analysis you'll need to look at a bunch of samples at a time. Typically you'll use some sort of Fourier transform. So your granularity will be limited by the window size I guess. I don't think this is very important in this case though, but maybe it gets you on the track. > Note that I don't need any kind of graphical output, as this needs > to be wrapped up in some kind of batch processing script---I have > about 11,000 files to analyze! > > The motivation for this is: I have a hardware DAC (digital audio > converter) in one part of my house, and a subwoofer in another. > There is a single coax run between the DAC and subwoofer, so I can > only send one channel. If the overwhelming majority of my music has > the bass mixed equally, sending only one channel isn't a problem. > But if I choose the "L" channel to send to the sub, and much music > has the bass mixed only to the "R" channel, then I won't be able to > hear the low frequencies. I want to find out how often this might > happen. > > Thanks, > Matt Can you mix the bass channel to mono? That would be the simplest solution. Regards, Philipp _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
