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Carnac the Magnificient - sarcastic answers to serious questions/comments

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments

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Matt J
National Instruments | CLA
Message 221 of 229
(361 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments

Trouble with DIO !

Did you know that a digital line cannot output a sine wave?  I am in just complete shock that a switch cannot just output whatever value I want!


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Message 222 of 229
(266 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments


@crossrulz wrote:

Trouble with DIO !

Did you know that a digital line cannot output a sine wave?  I am in just complete shock that a switch cannot just output whatever value I want!


Of course with 8 DOs (and a few resistors) you can make 1 8-bit AO...

 

I can hear his manager say: I still thing we need to find a software solution....

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Message 223 of 229
(259 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments


@crossrulz wrote:

Trouble with DIO !

Did you know that a digital line cannot output a sine wave?  I am in just complete shock that a switch cannot just output whatever value I want!


BTW. this reminds me of my old 8088 PC. It had a speaker that only beeped at one frequency. Some clever people came up with the idea to PWM the beep, resulting in speech output from the speaker.

 

This is actually getting way to close to a serious answer... Maybe I should post it in the original thread?

Message 224 of 229
(256 Views)
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Re: Carnac the Magnificient - sarcastic answers to serious questions/comments


wiebe@CARYA wrote:

@crossrulz wrote:

Trouble with DIO !

Did you know that a digital line cannot output a sine wave?  I am in just complete shock that a switch cannot just output whatever value I want!


BTW. this reminds me of my old 8088 PC. It had a speaker that only beeped at one frequency. Some clever people came up with the idea to PWM the beep, resulting in speech output from the speaker.

 

This is actually getting way to close to a serious answer... Maybe I should post it in the original thread?


Yes dangerously close to being a useful idea.

 

Pulse Density Modulation  (used by digital microphones in cell phones) only needs a low-pass filter.

 

Ben

Message 225 of 229
(250 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments


@Ben wrote:

Pulse Density Modulation  (used by digital microphones in cell phones) only needs a low-pass filter.

 


And we even have code I wrote over 10 years ago. Smiley Very Happy

 


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Message 226 of 229
(201 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments

Deta Sigma Simulation? Is that Delta Sigma Simulation? Is that the same as Pulse Density Modulation?

 

I'll probably need to read some wiki's on that. I never can remember the term Pulse Density Modulation when I need it.

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Message 227 of 229
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Re: Carnac the Magnificient - sarcastic answers to serious questions/comments


wiebe@CARYA wrote:

Deta Sigma Simulation? Is that Delta Sigma Simulation? Is that the same as Pulse Density Modulation?

 


It is one way to create a PDM bit stream, but I am sure there are others. Straight from Ben's link above:

 

PDMDS.png


LabVIEW Champion Do more with less code and in less time
Message 228 of 229
(140 Views)

Re: Carnac the Magnificient - sarcastic answers to serious questions/comments

PDM...

 

As an "old scope jockey" I see the decoding as exactly what I would expect if I had a bit stream driving an RC circuit where the RC timeconstant acted as low pass filter. IT could also be handled with moving average where the window size was large enough.

 

Ben

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Message 229 of 229
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