Optical to Analog Conversion

J

Jim Thompson

Guest
My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?

Or schematics for build-your-own?

Thanks!

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
I read in alt.binaries.schematics.electronic that Jim Thompson
<thegreatone@example.com> wrote (in
<m6t9719quov7r562cp179ad2o5c49utekk@4ax.com>) about 'Optical to Analog
Conversion', on Sun, 1 May 2005:
My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog
Click to expand...
Some sort of anti-copying measure? If you can get a schematic from a
consumer product manual supplier, you might be able to make a bridge
between the channels.
The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?
Click to expand...
Maybe you can get a hi-fi preamp with optical inputs and analogue
outputs.
Or schematics for build-your-own?
Click to expand...
It's not a trivial task at all; not that I'm saying you couldn't do it,
but it's a lot of work.
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sun, 01 May 2005 12:34:59 -0300, Jim Thompson <thegreatone@example.com>
wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?

Or schematics for build-your-own?

Thanks!

...Jim Thompson
Click to expand...
http://img.photobucket.com/albums/v413/sKaar/electronics/transceiverdongle.png
i was working on this a while back, it's for converting ethernet to
optical. it needs a lot of work, but it's a start, one that uses a prism,
the other uses separate optical parts. you definitely wouldn't need the
inverter. the connector that's on the optical out can probably have some
fibre driven into it, you run the fibre to the room you want it to supply,
then you add a storebought ir transistor with integral holder, some power,
and an rca plug. the ends of the fibre needs to be near perfect flat, you
can use a hot razor blade to do that. but don't mind me, i have no idea
what i'm blathering on about.

--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
 
On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson <thegreatone@example.com>
wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?
Click to expand...
Have look at
DA96: 4 channel, 24 bit, 96 kHz ADAT optical to analog converter - 1/2 rack
space.
http://www.musiciansnews.com/55/sonorus_to_distribute_swissonic_products_in_north_america.shtml

I have no experience with it but might in the future. My daughter has
embarked on a musical carrier and since dad is "into electronics" all of the
tech support should be easily accessible. Looks like I have to embark on
crash audio course..

--

Boris Mohar
 
I read in alt.binaries.schematics.electronic that Boris Mohar
<borism_-void-_@sympatico.ca> wrote (in
<dnv9719e3kgbsdeqe2tho6b8fmtvn3gl1o@4ax.com>) about 'Optical to Analog
Conversion', on Sun, 1 May 2005:

My daughter has embarked on a musical carrier
Click to expand...
Not the Brian Ferry? (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson
<thegreatone@example.com> wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?

Or schematics for build-your-own?

Thanks!

...Jim Thompson
Click to expand...

I guess since Sony owns so much program material, they want to keep it
un-copyable.

Why not just tap the speaker drive, voltage divider and transformer
maybe? Even that will get interesting as more stuff goes class-D.

John
 
On Sun, 01 May 2005 12:12:13 -0400, Boris Mohar
<borism_-void-_@sympatico.ca> wrote:

On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson <thegreatone@example.com
wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

[snip]

I have no experience with it but might in the future. My daughter has
embarked on a musical carrier and since dad is "into electronics" all of the
tech support should be easily accessible. Looks like I have to embark on
crash audio course..
Click to expand...
Yep. That's what I'm getting here too... dad is "into electronics".

But it's to my advantage... oldest son is a _very_good_ programmer, so
I'll meet his electronics needs... in exchange for him writing me some
more PSpice utilities... maybe a netlist comparator ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Sun, 01 May 2005 10:29:59 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson
thegreatone@example.com> wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?

Or schematics for build-your-own?

Thanks!

...Jim Thompson


I guess since Sony owns so much program material, they want to keep it
un-copyable.

Why not just tap the speaker drive, voltage divider and transformer
maybe? Even that will get interesting as more stuff goes class-D.

John
Click to expand...
That was the first thought. Have any keen ideas on leveling it?
Otherwise somewhat of a nightmare to keep proper levels at remotes.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
I read in sci.electronics.design that Jim Thompson
<thegreatone@example.com> wrote (in
<085a711dhplo72c77o57qspjchcpvo6gos@4ax.com>) about 'Optical to Analog
Conversion', on Sun, 1 May 2005:

That was the first thought. Have any keen ideas on leveling it?
Otherwise somewhat of a nightmare to keep proper levels at remotes.
Click to expand...
Not only at remotes, in UK. TV audio levels vary over almost a 20 dB
range (same channel, more that 10 dB within the same programme) since
no-one is apparently now employed to watch the level meters.

That Corp. THAT4301 can apparently be used as an AGC (not compression)
device that gives an approximation to 'constant loudness' audio output,
although the makers don't say so, AFAIK. I'm working on the design now
(between commuting round the world on standards business).
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
Radio Shack sells an inexpensive ($15) analog to SPDIF/
TOSlink converter (15-1242) Alas, seems like the wrong
direction. (Unless he uses it on one of the inputs.)
 
On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson <thegreatone@example.com> wrote:
My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

Any optical input "lines-out" only optical

Any analog input "lines-out" only analog

The son would like an analog signal (stereo) suitable for passing to
monitors in other rooms, but these other monitors only have RCA inputs
for audio.

Is there an off-the-shelf optical-to-analog converter available?

Or schematics for build-your-own?

Thanks!
Click to expand...

Jim,

Is the optical output 44.1KHz S/PDIF (TOSLINK)? If it is, I've just
designed a board that converts just that into stereo line-level
audio. It isn't trivial (and my design certainly isn't audiophile
quality - only 12-bits for a start). It was done mostly as a learning
exercise).

If it's DTS 5.1 surround (or anything other than plain stereo) then
your cheapest option is probably a PC with a soundcard that has an
optical input - amps with optical in look expensive.

Let me know if you're interested in my decoder design - here's a
snap of it (only just today commissioned the PCB!):

http://projects.jusme.com/tmp/spdif.jpg

I intend to put it on the web eventually anyway, just a matter
finding the time!

Regards,
--
Ian

"Tamahome!!!" - "Miaka!!!"
 
Hello Jim,

If this is a Toslink output you might want to search Google for "Toslink
adapters". I have seen them in a large store, but cannot remember where
because I didn't need one. We lucked out since our mini-disk unit had
both fiber and regular line outputs so I didn't buy the converter.

Regards, Joerg

http://www.analogconsultants.com
 
"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> a écrit dans le message de
news:Xv0hjRNq9QdCFw7l@jmwa.demon.co.uk...
I read in alt.binaries.schematics.electronic that Boris Mohar
borism_-void-_@sympatico.ca> wrote (in
dnv9719e3kgbsdeqe2tho6b8fmtvn3gl1o@4ax.com>) about 'Optical to Analog
Conversion', on Sun, 1 May 2005:

My daughter has embarked on a musical carrier

Not the Brian Ferry? (;-)
Click to expand...
LOL.
Ha ha ha... excellent John.


Isn't the Brian Ferry a kind of "boite ŕ musique" ?


--
Thanks,
Fred.
 
"Jim Thompson" <thegreatone@example.com> a écrit dans le message de
news:6l4a7154smuuo53nau44of07cosqgh0ae0@4ax.com...
On Sun, 01 May 2005 12:12:13 -0400, Boris Mohar
borism_-void-_@sympatico.ca> wrote:

On Sun, 01 May 2005 08:34:59 -0700, Jim Thompson
thegreatone@example.com
wrote:

My oldest son has a Sony STR-DE995 audi/video system with multiple
audio-source inputs, optical and analog (RCA).

Problem: There is NOT a common line-out...

[snip]

I have no experience with it but might in the future. My daughter has
embarked on a musical carrier and since dad is "into electronics" all of
the
tech support should be easily accessible. Looks like I have to embark on
crash audio course..

Yep. That's what I'm getting here too... dad is "into electronics".

But it's to my advantage... oldest son is a _very_good_ programmer, so
I'll meet his electronics needs... in exchange for him writing me some
more PSpice utilities... maybe a netlist comparator ;-)
Click to expand...
How much jitter will you get into the output?


--
Thanks,
Fred.
 
On Sun, 1 May 2005 19:20:11 +0100, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Jim Thompson
thegreatone@example.com> wrote (in
085a711dhplo72c77o57qspjchcpvo6gos@4ax.com>) about 'Optical to Analog
Conversion', on Sun, 1 May 2005:

That was the first thought. Have any keen ideas on leveling it?
Otherwise somewhat of a nightmare to keep proper levels at remotes.

Not only at remotes, in UK. TV audio levels vary over almost a 20 dB
range (same channel, more that 10 dB within the same programme) since
no-one is apparently now employed to watch the level meters.

That Corp. THAT4301 can apparently be used as an AGC (not compression)
device that gives an approximation to 'constant loudness' audio output,
although the makers don't say so, AFAIK. I'm working on the design now
(between commuting round the world on standards business).
Click to expand...
I looked-up that part. Seems promising. What sort of application are
you working... your audio loop?

I downloaded the data sheet and all the apnotes.

Since the speakers are likely bridge driven, do you have
recommendations as to how to take off the signal? Transformer?
Ground loop issues?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
FYI,

http://projects.jusme.com/cgi-bin/projects/projects/index.pl?id:spdifdac

--
Ian

"Tamahome!!!" - "Miaka!!!"
 
A small (less than 1MB) fast free PDF reader is at:

http://www.foxitsoftware.com/pdf/rd_intro.php

Robert
<Standard "I have nothing to do with company, etc.">
 
Hello Jim,

Is there an off-the-shelf optical-to-analog converter available?
Click to expand...
Just a thought: If this is a Toslink output (should say in the manual)
then you might be able to buy a converter. I have seen these a long time
ago in a big box electronics store but forgot which one. It wasn't very
expensive.

If you have to impress your son you could still provide your own
enclosure, or pretend it had to be flown in from Japan ;-)

Regards, Joerg

http://www.analogconsultants.com
 
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