Tape Trail

RE: Two part question eh?...

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geoffkait

M

In Reply to: RE: Two part question eh?... posted by kootenay on December 25, 2020 at 10:54:53

The sound is transmitted through the air once the acoustic waves leave the speakers. That part is obvious. What's not obvious is what the "audio signal" is in wires and cables. Hint: it's not vibration. The same idea applies to the cassette and tape head - it's not an acoustic wave until it leaves the speakers or headphones. Before that the audio signal is a different animal. But what? An (alternating) voltage, an (alternating) current, an audio waveform? An electromagnetic wave?

Edits: 12/25/20

Follow Ups:

RE: Two part question eh?... - kootenay 14:47:00 12/25/20 (2)
The audio signal when it leaves from a source through a cable is basically electric signals that have different frequencies which are placed within a magnetic field. The sound that we hear from the speaker is caused by vibrating the coil, which in turn vibrates the membrane of the driver and thus producing the exact replica of the frequencies which is captured in the first moment. Music to our ears.

If a thing's worth doing, it's worth doing well
(Proverb)
- RE: Two part question eh?... - geoffkait 04:01:31 12/26/20 (1)
  You're close, very close. The "signal" in the speaker cable is an alternating current and voltage that causes the speaker diaphragm to move back and forth. When current goes through a voice coil it produces a magnetic field that moves the diaphragm one direction or the other depending on which direction the current is moving through the + and - connections at that instant.. The instantaneous rate of alternating current is approximately 20 Hz to 20,000 Hz. The "signal" in the cable doesn't contain frequencies. The instantaneous frequency of the acoustic signal/waveform coming out of the speakers is derived from the rate that current and voltage in the cable is alternating at that instant.
  - Thanks... - kootenay 08:40:23 12/26/20 (0)
    For the eloquent and precise info. Stay safe.
    
    If a thing's worth doing, it's worth doing well
    (Proverb)
    
    Edits: 12/26/20

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