| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1272.1 | Total Harmonic Distortion | AQUA::ROST | Obedience to the law guarantees freedom | Tue Jul 19 1988 09:12 | 13 |
|
THD is Total Harmonic Distortion and the lower the better, in
principle.
In the case of amplifiers:
Current US law requires amps to be rated at a given RMS power into
a given load inpedance at agiven THD. So you will see a spec like
"50 watts per channel, both channels driven into 8 ohms, 0.01% THD".
Some manufacturers will deliberately raise the THD number so that
they can spec a higher power rating.
|
| 1272.2 | Try The AUDIO Notesfile | PARITY::GOSSELIN | Ken @DTN 247-2498 | Tue Jul 19 1988 12:22 | 9 |
| Sam,
You might get more info on your system purchase if you ask it
in the AUDIO notesfile (DSSEV::AUDIO)
.1 is absolutely correct regarding the meaning of THD........
Ken
|
| 1272.3 | specs? | WONDER::STRANGE | No sense of harmony | Tue Jul 19 1988 12:28 | 10 |
| Also realize that specs like this sometimes don't mean all that
much. Some companies measure THD at one single frequency. They
pick the frequency where the THD is lowest (usually about 1000 Hz)
and write that in the specs. Others measure THD across the entire
audible spectrum and give you a graph, or max and min values.
Sometimes it's a good idea to just ignore the specs and 'play it
by ear'. Listening is the best test. If it sounds good to you,
that's all that matters. See the DSSDEV::AUDIO conference for
exhaustive treatment of this subject.
Steve
|
| 1272.4 | | WONDER::STRANGE | No sense of harmony | Tue Jul 19 1988 12:30 | 4 |
| re:.2
You beat me to it! But its DSSDEV.
Steve
|
| 1272.5 | | QUARK::LIONEL | May you live in interesting times | Tue Jul 19 1988 12:55 | 8 |
| However, the THD produced by any halfway-decent CD player is so
low as to be inaudible. Anything less than .1% is not worth
arguing about.
It would seem to me that the carousel changer would be more reliable
over the long run.
Steve
|
| 1272.6 | Somehow I missed Audio | AKOV13::WANG | | Tue Jul 19 1988 15:28 | 4 |
| Thanks folks, it helps a lot; and I will start read Audio note.
Sam
|