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Old 17th June 2003, 09:29 PM   #11
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Default 96 botlles of beer on the wall

Dr. Everett v. Scott:
From the day he was born
He was trouble
He was the thorn
In his mother's side
She tried in vain

Criminologist: But he never caused her nothing but shame_

Dr. Everett v. Scott: He left home the day she died
From the day she was gone
All he wanted
Was rock and roll porn
And a motorbike
Shooting up junk

Criminologist: He was a low down cheap little punk_

Dr. Everett v. Scott: Taking everyone for a ride_

Chorus:
When Eddie said he didn't like his teddy
You knew he was a no good kid
But when he threatened your life
With a switch blade knife

Dr. Frank-N-Furter: What a guy_

Janet Weiss: Makes you cry_

Dr. Everett v. Scott: And I did_

Columbia:
Everybody shoved him
I very nearly loved him
I said hey listen to me
Stay sane inside insanity
But he locked the door
And threw away the key

Dr. Everett v. Scott: But he must've been drawn
Into something
Making him warn me
In a note which reads

Chorus: What's it say? What's it say?_

Eddie:
I'm out of my head
Oh hurry, or I may be dead
They mustn't carry out their evil deeds

Chorus:
When Eddie said he didn't like his teddy
You knew he was a no good kid
But when he threatened your life
With a switch blade knife

Dr. Frank-N-Furter: What a guy_

Janet Weiss: Makes you cry_

Dr. Everett v. Scott: And I did_

Chorus:
When Eddie said he didn't like his teddy
You knew he was a no good kid
But when he threatened your life
With a switch blade knife

Dr. Frank-N-Furter: What a guy_

Chorus: Whoa ho ho_

Janet Weiss: Makes you cry_

Chorus: Hey hey hey_

Dr. Everett v. Scott: And I did_

Chorus: Eddie_
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Old 17th June 2003, 09:30 PM   #12
jwb is offline jwb  United States
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Default Re: to jwb

Quote:
Originally posted by SY

0000000000000000,
0000000000000000,
0000000000000001,
0000000000000001,
0000000000000000,
0000000000000000,
0000000000000001,
0000000000000001,
This signal has a peak-to-peak amplitude of 1

Quote:
0111111111111111,
0111111111111111


0x7FFF, +32767

Quote:
1111111111111111,
1111111111111111


0xFFFF, -1

This signal has a peak-to-peak amplitude of 32768. Dynamic range is 20*log(32768/1) or 90.3dB.

Cheers
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Old 17th June 2003, 09:33 PM   #13
RobM is offline RobM  United States
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Well, having a redundant code when using signed representation depends upon which representation you're using. If you're using 2's complement then the range for 16 bits is -32768 -> 32767, and could be either -32768 -> 32767 or -32767 -> 32768 for a scaled representation (where 0 is represented as 0 + 32768 or 0 + 32767).
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Old 17th June 2003, 09:35 PM   #14
jwb is offline jwb  United States
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Yeah I'm just egging him on. If your system allows a signal to oscillate between 0 and +1, thereby having a +.5 DC offset, then your dynamic range increases to 96dB. But that sounds like a bad idea. I'm assuming that CD audio's smallest allowed signal is +1,-1.

-jwb
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Old 17th June 2003, 09:41 PM   #15
SY is offline SY  United States
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Omelette.

I don't understand your second set of statements. It seems like you're going from 32767 to -32767, for a peak-to-peak amplitude of... well, you know. The offset in my example is not 0.5 volt, it's 0.5 times the voltage corresponding to the LSB. That's a lot different. Unless you're using the CD player hooked to Ol' Sparky.

Fred's picture says it all. There's three levels clearly visible. That's not the smallest possible signal, it's the smallest possible signal with the constraint of symmetry. No impulse testing for you, Fred!
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Old 17th June 2003, 09:46 PM   #16
mlloyd1 is offline mlloyd1  United States
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Steve:
You win the third "make Michael spit out his pepsi on the keyboard award"!

I wish I could write 'em this good.

Quote:
Originally posted by Steve Eddy
.... I took the CD out of the drive, held it in my hand and looking sternly at it said:

I claim that I am the Great and Powerful Steve Eddy. I know all. I see all. I command all. The Great and Powerful Steve Eddy commands the data on this disc to compress and rearrange itself. So shall it be written. So shall it be done.
....
I'd just proved beyond any doubt that I truly am the Great and Powerful Steve Eddy. That I know all. That I see all. That I command all.
....
se
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Old 17th June 2003, 09:52 PM   #17
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Default Binary two's complement

From Burr Brown data sheet
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Old 17th June 2003, 09:52 PM   #18
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I think I get your point now SY. Better make it an offset of
-1/2 bit rather than +1/2 bit, though, because of the 2's
complement coding.
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Old 17th June 2003, 09:54 PM   #19
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Default Considering his usual post...........

"Steve:
You win the third "make Michael spit out his pepsi on the keyboard award"!

I wish I could write 'em this good"

Are you sure he's kidding................
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Old 17th June 2003, 09:57 PM   #20
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Default Re: clarifier clarification

Quote:
Originally posted by Fred Dieckmann
Starting with the disclaimer that I hate audio charlatans with a well documented passion and will include the claims of Mr. Bedini on data compression, I will admit to hearing the effect of demagnetizing, with a bulk tape eraser, some (not all) CDs. I believe it might have something to do with the permeability of the inks on the label. I will put on my boots for the oncoming load of "knowledge" from an expert on electromagnetics as well. In his defense (knowledge, not character), I will point out Mr. Bedini knows how to design amplifiers but lacked the expertise in marketing them possessed by some gifted individuals.
Aren't you afraid of Eddy currents in the reflective layer when
you demagnetize the CDs?
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