Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 162 - diyAudio
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Old 11th February 2015, 04:45 PM   #1611
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Join Date: Feb 2003
Location: West Coast of Norway
Quote:
Originally Posted by bambadoo View Post
Yes did power cycle. Program settings seems ok.
Also tried Hyperterminal - also with recommended settings, still no luck.

Will look into other serial adapters when I have the chance.

Hyperterminal can be downloaded here :
http://digitizor.com/wp-content/uplo...rterminal1.zip

From this site:
Install HyperTerminal Client on Windows 7 or Vista [FREE]
Sorry about the other post earlier. Tired early morning

This is the usb-rs232 adapter I try to use.
SYBAUSA - SD-USB-S >> USB to Serial Adapter

Tried with different pc's. Driver installed ok and com ports ok.
No luck connecting to the dam1021.
Used the "description" from this blog.

The right pins. Measured connections ok.
No luck connecting.
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Old 11th February 2015, 04:53 PM   #1612
soekris is offline soekris  Denmark
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Quote:
Originally Posted by bambadoo View Post
Sorry about the other post earlier. Tired early morning

This is the usb-rs232 adapter I try to use.
SYBAUSA - SD-USB-S >> USB to Serial Adapter

Tried with different pc's. Driver installed ok and com ports ok.
No luck connecting to the dam1021.
Used the "description" from this blog.

The right pins. Measured connections ok.
No luck connecting.
Remember no flow control, hardware or software. Your settings have hardware flow control enabled....
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Old 11th February 2015, 04:58 PM   #1613
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Yes sorry about the misleading picture. Tried with and without flow control. No luck I am afraid.
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Old 11th February 2015, 05:20 PM   #1614
zfe is offline zfe
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Quote:
Originally Posted by soekris View Post
Not that practical, would require > 3000 taps, and the intermediate frequency is good to have for the CD de-emphasis and crossover filters.

I have choosen 352K/384K as a good compromise for the intermediate rate, so there is space for enough IIR filters for crossover use and room correction. If you go up you get less IIR filters. # filters = 45M/49M divided with intermediate rate divided with 8 = 16.

The FIR2 filter don't require much, I'm looking into doing a bessel or butterworth type filter there.
The intermediate frequency is an explicit parameter in the filter-file. Is it possible to use other intermediate frequencies than 352K/384K?

Is the FIR1 IIR FIR2 sequence mandatory (or could something like FIR1 IIR1 FIR2 IIR2 FIR3, or FIR0 FIR1 IIR FIR2 be used)?
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Old 11th February 2015, 06:09 PM   #1615
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Quote:
Originally Posted by soekris View Post
Remember no flow control, hardware or software. Your settings have hardware flow control enabled....
Tried to shorten the cable. Everything checks ok.
Also using description from this blog
Dimdim's Blog | DIY Audio, Arduino, Computers, Music

The cursor just keeps blinking. No response from the umanager.

I know - troubleshooting is very difficult via forum...
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Old 11th February 2015, 06:39 PM   #1616
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Quote:
Originally Posted by nautibuoy View Post
Hi Søren. I'm working on ideas for a stackable plug-in board for the DAC and I see the HiFiduino article includes a mechanical drawing of the board mounting, output socketry etc. Would it be possible to provide additional information to detail the positions of J1, J2 and J3?

Many thanks.

Ray
Søren, maybe my post got lost as the threads remain very active but would be grateful for a mechanical drawing showing the location of the headers. Thanks.

Ray
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Old 11th February 2015, 07:07 PM   #1617
soekris is offline soekris  Denmark
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Quote:
Originally Posted by zfe View Post
The intermediate frequency is an explicit parameter in the filter-file. Is it possible to use other intermediate frequencies than 352K/384K?

Is the FIR1 IIR FIR2 sequence mandatory (or could something like FIR1 IIR1 FIR2 IIR2 FIR3, or FIR0 FIR1 IIR FIR2 be used)?
The sequences and intermediate sample rates and fixed in hardware.
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Old 11th February 2015, 07:10 PM   #1618
TNT is offline TNT  Sweden
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This is what I ment with a processing stage model. A high level block diagram of the HW and SW functions and the process path.

//
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Old 11th February 2015, 07:56 PM   #1619
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Well - made up a spdif input (with AN spdif toroid transformer) according to schematics posted earlier.
Test with unbuffered outputs - into a DCB1 unity gain preamp.

It is alive. Too early to say anything about sound quality but I can sure tell you:
Its got potential

Beautyful intital layout.


Must look more into the "connectotoumanager" problem I have...
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Last edited by bambadoo; 11th February 2015 at 08:23 PM.
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Old 11th February 2015, 08:21 PM   #1620
pos is offline pos  Europe
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Quote:
Originally Posted by soekris View Post
When I looked at rePhase I didn't see any "intermediate phase" setting ? Or how to combine ? I would be nice if I don't have to mess with the SoX source code....

You don't need to worry about saturation, the filters coefficients floats are converted to 2.30 fixed format.
Hi Soren,

You can either combine several filters, minimum-phase and linear-phase, possibly at different frequencies (spread the poles), or you can generate a linear-phase filter and then partially linearize its phase with the "phase linearization" tab.
I will try to post e few examples tonight.

As for the saturation, I was not worried about the coefficients themselves, but the result of the convolution: even it the resulting amplitude curve does not exceed 0dB you can still get saturation because of the phase shifts.
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