Bottlehead Forum

General Category => General Discussion => Topic started by: galyons on June 17, 2015, 05:14:21 PM

Title: Electron Microscope Image of Stylus in Groove
Post by: galyons on June 17, 2015, 05:14:21 PM

Ok, I will admit upfront....This is a bit geeky.  But I enjoyed the images all the same!!

http://dangerousminds.net/comments/microscopic_footage_of_a_needle_moving_across_the_grooves_of_a_record (http://dangerousminds.net/comments/microscopic_footage_of_a_needle_moving_across_the_grooves_of_a_record)

Cheers,
Geary

Title: Re: Electron Microscope Image of Stylus in Groove
Post by: Grainger49 on June 18, 2015, 05:19:41 AM

I am a little shocked at how little of the stylus touches the groove.  I just hadn't realized that before.

Title: Re: Electron Microscope Image of Stylus in Groove
Post by: mcandmar on June 18, 2015, 05:27:19 AM

That is fascinating to see, but has me thinking about how record encoding works, i get the movement of the needle translates into an electrical sine wave via a coil and magnet, but how do you extract two separate channels out of that.  i.e. a stereo signal.     ....i know what i'm researching for the next few hours  :)

Title: Re: Electron Microscope Image of Stylus in Groove
Post by: galyons on June 18, 2015, 06:38:49 AM

Quote from: mcandmar on June 18, 2015, 05:27:19 AM

That is fascinating to see, but has me thinking about how record encoding works, i get the movement of the needle translates into an electrical sine wave via a coil and magnet, but how do you extract two separate channels out of that.  i.e. a stereo signal.     ....i know what i'm researching for the next few hours  :)

Have a go at this video!!

https://www.youtube.com/watch?v=umu37m0qUiE (https://www.youtube.com/watch?v=umu37m0qUiE)  ;D

Cheers,
Geary

Title: Re: Electron Microscope Image of Stylus in Groove
Post by: mcandmar on June 18, 2015, 07:25:15 AM

Curiosity satisfied. Thanks Geary :)