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Old 26th September 2012, 06:03 PM   #11
skidave is offline skidave  United States
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Thanks for the updated posts and info. Did you acquire the Basic or Extended 'Non-Commercial' version.

Also, just curious what analog interface you are using. I'm assuming an outboard USB interface.

Thanks
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Old 26th September 2012, 08:41 PM   #12
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Quote:
Originally Posted by skidave View Post
Thanks for the updated posts and info. Did you acquire the Basic or Extended 'Non-Commercial' version.

Also, just curious what analog interface you are using. I'm assuming an outboard USB interface.

Thanks
This is Extended 'Non-Commercial'. The results shown are digital I2S loopback on the miniDSP USBStreamer (USB to I2S, SPDIF board).
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Old 8th October 2012, 10:28 PM   #13
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tanks for posting this I have TrueRTA and found it wanting
I am using Audiophile 192 sound card (internal) and loop back suffers from peack at 50 Hz Floor level is about 70dB

Most probably my mistake I shuld have used an externall one.
So I will have to think 2 times before trowing more money on what then wuld not be more useful than toy.
Can you post more details for the interface please?
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Old 9th October 2012, 01:45 AM   #14
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Quote:
Originally Posted by Bksabath View Post
tanks for posting this I have TrueRTA and found it wanting
I am using Audiophile 192 sound card (internal) and loop back suffers from peack at 50 Hz Floor level is about 70dB

Most probably my mistake I shuld have used an externall one.
So I will have to think 2 times before trowing more money on what then wuld not be more useful than toy.
Can you post more details for the interface please?
The loopback test simply had the USBStreamer (miniDSP) connected to a USB port of my notebook. The I2S data 1&2 OUT were connected to I2S data 1&2 IN. ASIO was used instead of Windows driver. There was no analog-digital conversion in the path.

I have a Roland US-25 which does not good at all for measurement purposes. I wish to use WinAudioMLS, USBStreamer and a custom analog front-end board building a complete high-performance audio analyzer.

Last edited by panson_hk; 9th October 2012 at 01:59 AM.
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Old 9th October 2012, 02:48 AM   #15
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Tank you

I will try the demo and see
The screen shot you posted look impressive...
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Old 9th October 2012, 04:44 AM   #16
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The demo version has limited bandwidth and dynamic range.
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Old 12th November 2012, 03:23 AM   #17
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I have made a DAC board using WM8740. It will take I2S data from USBStreamer. Will post measured result soon.

Next step is to make an ADC board using PCM1804.
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Old 13th November 2012, 03:28 AM   #18
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I made a test to evaluate loopback (USBStreamer data out pin connected to data in pin) FFT for using two different connecting modes: directsound (DS) or ASIO. For DS, WinAudioMLS signal generator, Audacity and foobar were used. Foobar output the 1 kHz sine generated by Audacity. System is Win 7, 64-bit Pro. FFT plot was obtained by WinAudioMLS with 64-bit FFT enabled.

Did I make a proper test for intended purpose? What is the root cause of sidebands associated with DS connection?
Attached Images
File Type: jpg DirectSound vs ASIO.jpg (146.2 KB, 111 views)
File Type: jpg Audacity - DS.jpg (125.0 KB, 106 views)
File Type: jpg foobar - DS.jpg (124.2 KB, 105 views)
File Type: jpg WinAudioMLS Gen - ASIO.jpg (121.7 KB, 105 views)
File Type: jpg WinAudioMLS Gen - DS.jpg (124.9 KB, 105 views)
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Old 13th November 2012, 04:07 AM   #19
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Default WM8740 DAC board measured data

Here are measured data for WM8740 DAC board. The differential output of the DAC chip was directly connected to AP S1 input since the output filter/buffer has not been populated. AP S1 analog generator and digital generator (D/A to output amplifier) were also measured to set reference levels.

I2S input of the DAC board was from USBStreamer. WinAudioMLS (with ASIO connection selected) was used to provide 1 kHz tone.

Analog generator provides the best output. It can be clear seen from the bandreject FFT plots. WM8740+USBStreamer+WinAudioMLS seems to be as good as S1 digital generator+D/A+analog output. In fact, WM8740 combination has fewer high order harmonics.
Attached Images
File Type: jpg S1 Gen Mon.jpg (151.3 KB, 32 views)
File Type: jpg S1 GenMon DGEN.jpg (133.9 KB, 25 views)
File Type: jpg WM8740_directOut_ASIO.jpg (143.2 KB, 21 views)
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Old 13th November 2012, 06:04 AM   #20
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I just found that the data associated with directsound are not correct due to incorrect mixer volume setting.

Last edited by panson_hk; 13th November 2012 at 06:21 AM.
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