Is my LT44 transformer suitable for audio (de)coupling?

Apr 25, 2006 108 Replies

"Lostgallifreyan"

** Wrong.

It has equal amounts of noise energy in equal amounts of bandwidth.

So, 50% of the noise energy is in the band from 10 kHz to 20 kHz.

90 % is in the band from 2kHz to 20 kHz.

95 % is in the band from 1 kHz to 20 kHz.

99% is in the band from 200Hz to 20 kHz.

Get it ?

** No - because it does utterly dominates the energy spectrum.

....... Phil

"GregS"

** What a complete wanker.

....... Phil

"Lostgallifreyan"

** WRONG.

Pink noise has equal energy in each octave band or fraction thereof.

However, white noise has about 30 dB more energy at the high end of the audio band compared to the low end.

....... Phil

"Lostgallifreyan"

** Absolute CRAP.

Go away - half wit.

.......... Phil

"Tom MacIntyre"

** Bandwidth in Hz etc directly indictates the *information* carrying ability of a channel.

That is why it is used in electronics.

......... Phil

"Phil Allison" wrote in news: snipped-for-privacy@individual.net:

Sledge away mate, you know it makes sense. :)

Remember this little gem:

[quote, you, earlier post] It has equal amounts of noise energy in equal amounts of bandwidth.

So, 50% of the noise energy is in the band from 10 kHz to 20 kHz.

90 % is in the band from 2kHz to 20 kHz.

95 % is in the band from 1 kHz to 20 kHz.

99% is in the band from 200Hz to 20 kHz. [/quote]

That looks like what I said, an equal spread across the frequency plot of the spectrum. Pink noise, is as you said, the spread across the pitch plot.

If I took your line I could say that 99% was in the band up to 19.8 KHz (1% from there to 20 KHz) and suggest that the LF was dominating. The asymmetry comes from the change from plotting white noise as frequency, to plotting as pitch.

And much used in general electronics as in 6dB per octave filter, etc. Even when not dealing with actual audio.

* I like you. You remind me of when I was young and stupid Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound.

white noise is evenly distributed by frequency. (per Hz)

But frequency perception is logarythmic, each octave has twice as many Hz from end to end as the one below it therefore, with white noise, twice as much energy as the one below it.

Bye. Jasen

Jasen Betts wrote in news: snipped-for-privacy@clunker.homenet:

Don't tell me, tell those who disagreed with me. :) You re-expressed exactly what I've been saying here.

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