[Industrial One]

On Jul 29, 10:23 pm, David Nebenzahl wrote:
On 7/29/2010 8:29 PM Industrial One spake thus:

Is there any application that can convert songs with a really low
sample rate (8 khz) to 44.1 by extrapolating/cloning lower bands into
the missing higher frequency shelf?

Can't work. (More properly, I should say that it can't yield any better
result than the original 8kHz recording.)

Think digital pictures. Think of a little thumbnail, say 150 x 250
pixels that you resize to 1500 x 2500 pixels. It'll be bigger, but won't
look any better than the little original. Basically the same thing you'd
be doing with the audio file.

--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

I'm aware it's not possible to restore something out of nothing.
That's not what I asked for. I asked if any program exists that tries
to replicate the missing higher frequencies by extrapolating from the
audio that already exists. Pseudo-high quality, pseudorestoration,
call it what the **** you want.

Example:

http://i26.tinypic.com/35atabp.jpg Song at 12 khz
http://i32.tinypic.com/intlw6.jpg Song at 22 khz (upper frequencies
restored)

Notice how the pattern is predictable. Any program that does even a
half-ass job of this is desirable. Anyone got any leads what to look
for?

[David Nebenzahl]

On 7/29/2010 10:34 PM Industrial One spake thus:

I'm aware it's not possible to restore something out of nothing.
That's not what I asked for. I asked if any program exists that tries
to replicate the missing higher frequencies by extrapolating from the
audio that already exists. Pseudo-high quality, pseudorestoration,
call it what the **** you want.

Example:

http://i26.tinypic.com/35atabp.jpg Song at 12 khz
http://i32.tinypic.com/intlw6.jpg Song at 22 khz (upper frequencies
restored)

What is that display even showing? Pardon my ignorance, but is that some
kind of spectrum analyzer? Or just a waveform viewer? And what does it
mean that the top quarter of the display is chopped off in the "before"
view but visible in the "after" one? Looks suspicious to me ...


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

[Don Pearce[_3_]]

On Fri, 30 Jul 2010 11:38:01 -0700, David Nebenzahl
wrote:

On 7/29/2010 10:34 PM Industrial One spake thus:

I'm aware it's not possible to restore something out of nothing.
That's not what I asked for. I asked if any program exists that tries
to replicate the missing higher frequencies by extrapolating from the
audio that already exists. Pseudo-high quality, pseudorestoration,
call it what the **** you want.

Example:

http://i26.tinypic.com/35atabp.jpg Song at 12 khz
http://i32.tinypic.com/intlw6.jpg Song at 22 khz (upper frequencies
restored)

What is that display even showing? Pardon my ignorance, but is that some
kind of spectrum analyzer? Or just a waveform viewer? And what does it
mean that the top quarter of the display is chopped off in the "before"
view but visible in the "after" one? Looks suspicious to me ...

No, the upper, HF portion of the display is visible in the "before"
view. It has been chopped off in the after view. So this is not a
picture of a restoration, but of a high cut.

You can tell which is which by the info box at the bottom which says
"initial state" when the HF is there, and "silence" when it isn't.

I'm afraid Mr Industrial is a purveyor of porky pies.

d

[Industrial One]

On Jul 30, 6:34 am, Dick Pierce wrote:
Industrial One wrote:


I'm aware it's not possible to restore something out of nothing.

Then that should be the end of it.

That's not what I asked for.

Actually, you did.

I asked if any program exists that tries
to replicate the missing higher frequencies by extrapolating from the
audio that already exists. Pseudo-high quality, pseudorestoration,
call it what the **** you want.

Okay wise-ass, there is a difference between "restoring something out
of nothing" and "restoring something out of something." That better?

But whatever, I upsampled via a resampler with no anti-aliasing and
minimum accuracy and the results aren't too bad actually. I didn't
know it was this easy.

It works well on 22 kHz to 44 but sucks with trying to restore ultra-
low quality like the piece of audio I had which was at 6 kHz. I'm sure
there is something more advanced out there?



On Jul 30, 12:38*pm, David Nebenzahl wrote:
What is that display even showing? Pardon my ignorance, but is that some
kind of spectrum analyzer? Or just a waveform viewer? And what does it
mean that the top quarter of the display is chopped off in the "before"
view but visible in the "after" one? Looks suspicious to me ...

A song in spectrographic view. The horizontal blips you see are piano
notes. And the solid vertical square stumps are the drums. What you
see chopped off is the higher frequency shelf, which I deleted to give
you guys a chance to use your imagination and notice how easily
predictable patterns it has, and how high quality frequency
restoration can be feasible.