Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Our Sound and Cd,s and stuff

  1. Nov 28, 2004 #1
    Hello all

    hope this find you all in the best of the health.

    I was wondering how do we copy our voice on a cd or a cassette.

    please reply soon. Thanx in advance.

  2. jcsd
  3. Nov 30, 2004 #2
    Greetings, Bin Qasim, and the best to you too!

    This cassette, is it to be digital or analog?
    Where to begin I wonder. Are you familiar with waveforms? How about the need to digitize an analog signal above some minimum sampling rate in order to avoid aliasing, such as having sample rate greater than two-times the highest frequency present in the analog signal (Nyquist Sampling Rate)?
    You may be interested in more a non-technical walk through the mechanical side of using oxide of iron (rust dust) and a binding agent (glue) to adhere it onto a thin plastic tape (wallah, a cassette tape is born!). The ferromagnetic property of the oxide allows it to be magnetized and with some very clever electronic trickery the rest is history.
    I hope this was worth the time it took you to read it.
  4. Dec 2, 2004 #3
    Maybe Bin was asking how do we practically do it in a computer. I'm not sure.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook