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openglcg last won the day on October 6 2015

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About openglcg

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  1. put it to the test
  2. Check this out (bass music)

    goes into the 24hz or so range. https://www.youtube.com/watch?v=D7NLo21DyRE
  3. So I did some experimenting today to see how the basic bandwidth principles of digital communications can apply to accurate bass reproduction. Here's the basic concept: Take a basic sign wave and pulse it on and off with another signwave via amplitude modulation. You will get something that is the equivalent of two signwaves centered around the original waves frequency. The faster you want to pulse the wave accurately, the wider the two components have to be in terms of frequency. This is why we use bandwidth as a term for describing the number of pulses that can be transmitted digitally each second. -There's a picture of this in the attached sub bandwidth.jpg- So I decided to try producing an example of this limitation digitally. I used an oscillator and a 24db/oct high pass filter to simulate a woofers roll off. -I attached a sample of this as "sub bandwidth.mp3" and a picture of the two wave forms as "wave forms.jpg"- The rolled off version is first and the unfiltered version is second in the audio. The unfiltered version is first and the rolled off version is second in the picture. The rolled off version was boosted in volume to make it easier to hear the true difference between the rolled off version and the not rolled off version without the change in volume. I tried to place it within the frequency range of most subs (~37-61hz) so more people could listen to it. Its pretty easy to hear and see that the pulsing is not as strong in the filtered version. So there could be an advantage to having low frequency extension beyond just hearing solid low frequencies. The question is how much? I tried with my apartment sub (quietly) using its own roll off and could hear what i thought was the same effect. Its hard to tell because i cannot quickly switch off and on its roll off and get a pair of normalized samples to listen too. I also have no good mic to use for this experiment. But it seems to me, according to this experiment, that it does play somewhat of a roll although probably not as exaggerated as in the example. sub bandwidth.mp3
  4. Spac Lab question...

    a 40 hz wave could look like a 20hz if the sample points used by the test were not exactly synced at a power of 2 ratio to 40hz. So if you looked at the sample point it would be slightly different each time as it rolled across the 40hz wave and looking only at those samples you would see a slight oscillation maybe going between a higher average over the first 40 hz wave and a lower average on the second 40 hz wave and since you are dealing with a pure 40 hz tone this could repeat enough to register. or something like that
  5. Low Frequency music

    I am putting a Dayton um18 in my car soon and have looked though my collection for tracks that have strong components below 35hz. So far these are the gems: #1!!!! Immortal One - The Cosmic Effect mixtape (category: hip hop instrumental) This is a mixtape of a handful of songs. As you can see most songs have strong notes in the 35-30 and the 30-20 hz range. And not a bad mixtape either! Graph of first few songs attached. Demo on soundcloud: https://soundcloud.com/immortal-one1/immortal-one-the-cosmic-effect-preview-2 and here are some others (all have elements below 35hz) 6blocc - great gig in the sky (remix) (solid 32.5hz) ** p-note - just (sweeps down under 30hz) *** commodo - space cash (solid tones and components around 30) *** c418 - subwoofer lullabye (audialist remix) (solid 32.5)*** commodo kahn gantz - so familia (solid 30hz most song) kromestar x captain- who r u (some solid around 30hz action) *** kromestar - there just dreams kromestar - old face mister - six attack of the giant fly (20hz) versa - rain fall in dub (sub 30hz) kromestar - system log kromestar jay5 - backwoods (sub 30hz) kromestar - untitled clouds (lots of near 30) dark tanturms - cosmic (mixed component) th7 immortxl7z - phxntom godd7ss th7 immortxl7z - ht7 pursiut (mixed well between 35 and 18hz) kromestar - in 2 minds (some mixed ~ 35HZ) kromestar - technique (near 30 every 32 beats) kromestar - purple cloud (mixed down below 30hz) synkro - midnight sun(lots of octave syncing with lower octave around 30hz) immortal one - z7n (27ish) * captain - trapped inna zone (30 solid) captain - gameboy bangs (32.5) reso - blissed out (apsis remix) (solid below 30 often) versa - shadow movement (sweeps to 32.5) devnik - five point palm exploding heart technique (near 30 solid lots) th7 immortxl7s - 90210 (lots of sub 30 hz note) radikal guru - dread commandments (35 hz notes) (passes because its soo good) kromestar - galaktic war (33) kromestar - noiz Edit heres more: calyciforus - glyndon (33) samiyam - snakes on the moon (32) kromestar - heavenly calm (34) kromestar - the forge (34) danny scrilla - rigel7 (mixed through 30) sub basics - elixer (29) kromestar jay 5ive - starsky and hutch (mixed down to 20) k41 - rain (33) anex - siena (33) om unit - cradle (35) cyberoptics - shades of orange (32) kromestar - sidetracked (35) edit heres more: cessman - positive thinking (33) KROMESTAR - REGGIE (23)!!!!!!!!!!!!!!!!!!!!!!! <cool song cessman - deep space (37) th7 immortxl7z - new love (33)