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'[EE] Audio from serial port.'
2005\10\25@113914 by Mark Rages

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I promised somebody I'd post here when I was finished with my "audio
over RS-232" project:

http://vivara.net.nyud.net:8090/blog/?p=24

Looks like hackaday.com has picked it up.  But they got my name wrong.  :(

Regards,
Mark
markrages@gmail
--
You think that it is a secret, but it never has been one.
 - fortune cookie

2005\10\25@121332 by Harold Hallikainen

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> I promised somebody I'd post here when I was finished with my "audio
> over RS-232" project:
>
> http://vivara.net.nyud.net:8090/blog/?p=24
>
> Looks like hackaday.com has picked it up.  But they got my name wrong.  :(
>
> Regards,
> Mark
> markrages@gmail


Pretty clever! I especially like the user comment:

"I think, for your next trick, you should hook up a modem and send the
audio over a phone line."


Harold

--
FCC Rules Updated Daily at http://www.hallikainen.com

2005\10\25@150536 by Peter

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On Tue, 25 Oct 2005, Mark Rages wrote:
> I promised somebody I'd post here when I was finished with my "audio
> over RS-232" project:
>
> http://vivara.net.nyud.net:8090/blog/?p=24
>
> Looks like hackaday.com has picked it up.  But they got my name wrong.  :(

This is not fair. They should wait until *i* get around to write *mine*
up. I made such a thing months ago and I had proper log compression too,
as well as oversampling and resampling to kill the whine (I was playing
back 8kHz au at 115kBauds), and shuffling equivalent-weight patterns to
kill the whine some more, AND noise mix-in when kerning to avoid pops. I
used lookup-table PCM not ADPCM, at an equivalent resolution of 4 bits
(3 bits per character, 2 characters per symbol out). I still have it.
His photos look impressive but ime you can't hear a thing with a 4 ohm
speaker driven with 20mA. Even headphones sound very quiet. The best I
could muster was a telephone piezo speaker.

Peter

2005\10\25@154253 by Mark Rages

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On 10/25/05, Peter <spam_OUTplpTakeThisOuTspamactcom.co.il> wrote:
{Quote hidden}

Comments:
1. I am doing resampling via libsamplerate.
2. Whine is killed by moving start and stop bits inside the feedback loop.
3. Sigma-Delta != ADPCM.  Sigma-Delta is not a differential coding.
It is more comparable to PWM, with the noise shaped up into higher
frequencies when possible.
4. Audio is quiet but audible into 4 ohm speaker.  Painfully loud into
headphones.  I suppose this depends on the electrical specs of the
serial port.  Still, I would expect my laptop to have less output than
a desktop with real +/- 12V supplies.
5. Post your code and I'll link it from my page.

Regards,
Mark
markrages@gmail

--
You think that it is a secret, but it never has been one.
 - fortune cookie

2005\10\25@232828 by Vitaliy

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face
The link no longer works: "Error establishing a database connection" :-(

----- Original Message -----
From: "Mark Rages" <.....markragesKILLspamspam@spam@gmail.com>
To: "Microcontroller discussion list - Public." <piclistspamKILLspammit.edu>
Sent: Tuesday, October 25, 2005 12:42 PM
Subject: Re: [EE] Audio from serial port.


{Quote hidden}

> --

2005\10\26@091315 by Mark Rages

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On 10/25/05, Vitaliy <EraseMEspamspam_OUTspamTakeThisOuTmaksimov.org> wrote:
> The link no longer works: "Error establishing a database connection" :-(
>

sorry about that. I have the worst web host ever!

try the direct link:
http://vivara.net/blog/?p=24

Regards,
Mark
markrages@gmail
--
You think that it is a secret, but it never has been one.
 - fortune cookie

2005\10\26@111330 by Bert van Dam

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face

You link on your page to Roman Black, did you get his encoder software to
work?

Have fun,
Bert


>sorry about that. I have the worst web host ever!
>
>try the direct link:
>http://vivara.net/blog/?p=24
>
>Regards,
>Mark

2005\10\26@121755 by Mark Rages
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On 10/26/05, Bert van Dam <bertvandamspamspam_OUThome.nl> wrote:
>
> You link on your page to Roman Black, did you get his encoder software to
> work?
>
> Have fun,
> Bert
>

No.  And he doesn't give much description of it other than "closed
loop math modeling".

Regards,
Mark
markrages@gmail
--
You think that it is a secret, but it never has been one.
 - fortune cookie

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