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* [EMAIL PROTECTED] (Peter Wood) on Thu, 19 Aug 1999
| > Specified output Maximum output level Load impedance
| >Headphones - 10 mW + 10 mW 32 ohms
| >LINE 300 mV (-12dB) - 50k ohms
| So from this it seems to indicate that one socket does both. God knows
| how it decides. I don't know too much about how audio works, so does
| line out have a small current on it?
It checks the load impedance. If it is low, it says "the jack is being
used for headphones"; if it is high, it says "the jack is being used for
line out". It then compensates for the difference. Or that is what is
supposed to happen. I've never really tried it (my one line out device has
the impedance of a set of headphones).
| Also OT anyone got a good reference about how the dB scale works?
The decibel scale is a logarithmic scale that measures signal energy.
Mathematically, it is 10 times the common log of the volume ratio between
the energy of a particular signal and a baseline signal (which is, I
believe, a 1KHz tone at what registers as 0dB). More directly useful to
you, doubling volume (energy) is 10dB, so a 20dB sound is twice as loud as
a 10dB sound, and a 110dB sound is twice as loud as a 100dB sound.
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