From: cr88192@gmail.com   
      
   On 9/8/2025 4:10 PM, Scott Lurndal wrote:   
   > BGB  writes:   
   >> On 9/8/2025 3:59 AM, David Brown wrote:   
   >>> On 07/09/2025 23:12, MitchAlsup wrote:   
   >   
   >>> There is /some/ overlap, because both groups spend a lot of time   
   >>> listening to music, which exercises and improves both functions.   
   >>>   
   >>   
   >> I listen to music a lot, but usually House and EDM and similar.   
   >   
   > Not that I listen to that, but IIRC, most of that is fairly narrow   
   > in frequence range and mostly generated electronically instead   
   > of by actual instruments (drum machines, synthesizers, etc.)   
   >   
   > So you're starting with "artificial" digital signals.   
   >   
      
   Fair enough.   
      
   I had noted when looking at some of this that typically the frequency   
   spectrum drops off sharply to pretty much nothing. Exactly where this   
   point is depends a lot on the song, but somewhere in the area of 11 to   
   16 kHz seems typical.   
      
   But, yeah, it appears like things often drop off steeply after a few   
   points: 8kHz, 11kHz, and 16kHz. With a few songs looked at having a sort   
   of "stair step" look in their spectrum.   
      
      
   If I take a song and do an 8kHz high-pass filter, what is left mostly   
   sounds like varying levels of white noise.   
      
   One of my other test cases (mostly for speech; ripped from the   
   audio-track of an episode of an animated TV show), has a drop-off wall   
   at 8kHz (nothing over 8kHz).   
      
   Checking for another animated show, it seems to have an 8kHz wall for   
   the speech, but a 4kHz wall for the background music.   
      
   The presence of a sharp 8kHz frequency wall in several cases does imply   
   that 16kHz recording is likely popular for voice acting.   
      
      
      
   Some songs are also weak for testing stereo encodings (or, "too easy")   
   because they are essentially mono with little (if any) stereo   
   divergence. Often, if there is stereo divergence, it is usually a pan   
   adjustment.   
      
      
   There are some songs I had found where there is a stronger stereo   
   component. For example, the intro song for "Ghost in the Shell: Stand   
   Alone Complex" being a stronger test case for stereo encodings (and has   
   a more obvious loss of quality when converted to mono).   
      
      
   Semi-interesting is one can invert one of the channels and see how much   
   of the song drops out.   
      
      
   > While classical, progressive rock, jazz and classic rock music all leverage   
   > real-world analog instruments, most of which have unique and complex   
   > harmonic elements and remain in the analog domain until converted   
   > to final digital form.   
   >   
      
   OK.   
      
   I guess, in any case, natural recordings probably wouldn't have an   
   8/11/16 kHz stair-step pattern.   
      
   It seems like one could expect people to use 44 or 48 as a default for   
   pretty much everything, but if everything were being done at 44 or 48,   
   wouldn't likely see this stair-step pattern either (nor the apparent   
   "frequency walls" effect when looking at audio pulled from TV shows;   
   where whatever is going on with the audio is at a sampling rate lower   
   than 44 or 48).   
      
      
   I haven't really listened that much to non-electronic music.   
   Pretty much my whole life has been in the time where people mostly make   
   music on computers.   
      
   Haven't listened that much to classical or similar apart from being in   
   the form of MIDI files and similar.   
      
      
      
   Well, apart from the band at the church I go to. They are mostly using a   
   synthesizer and electronic drums and similar though (where the drum set   
   is the black plastic disks that make drum sounds when hit variety). The   
   instruments then connect up to a computer in the back of the room where   
   most of the audio mixing happens. So, probably not a true analog   
   experience here.   
      
      
   IIRC, they are using 3-pin XLR for the microphones, with DIN-5 for some   
   of the other instruments (the keyboard and drums use DIN-5). My dad   
   plays guitar sometimes, and they use an interface box to plug 1/4" TRS   
   cable into XLR.   
      
      
   Not entirely sure of the specifics, but they can adjust the volume and   
   similar of the various instruments on the computer (not entirely sure   
   how it works, not looked into it too much). IIRC, I think all the XLR   
   connectors and similar plug into a box which then plugs into the   
   computer over USB or something.   
      
   Looking on Amazon, a similar looking sort of box seems to go for around   
   $500 (for a "Multi-track mixer/recorder").   
      
   Not sure of the audio properties of all of this.   
      
   Also they have a wireless microphone for the pastor and similar, which   
   also feeds into it somehow.   
      
   Sometimes they need to test things before starting (having him turn on   
   the microphone and stay stuff), as sometimes the microphone fails to   
   connect to the computer in the back.   
      
   Not sure, but seems to behave sort of like it is using a Bluetooth   
   interface or similar. Where, turn it on, say stuff, usually connects (if   
   it does so) after around 10 or 15 seconds or so (and if/when it loses   
   connection, it goes silent until it can reconnect; after another 10   
   seconds or so, when audio comes back).   
      
   Not seeing an exact match, but similar looking sorts of microphones seem   
   to go for around $40 to $60 on Amazon.   
      
      
   I don't really mess with any of this as it isn't really my area.   
      
      
   ...   
      
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