Open-source USB interface: Audio Widget - Page 211

scopeboy · 17th January 2013, 09:14 PM

I posted my findings over in the Raspberry Pi thread:
Raspberry Pi -A New DIY'ers Digital Hub?

With the config I posted there, as far as I can see it is glitch-free as long as there are no USB1.x devices in the system. But if one is connected, such as a keyboard, it'll cause the occasional pop even if you never press any keys. This means I have to scrap my USB HID user interface.

However it is so easy to control from a smartphone or tablet, that I'm questioning whether I needed the UI in the first place.

borges · 12:33 PM

The driver source code has been modified for Win+ASIO at 44.1/88.2/176.4 to behave more like UAC2 on Linux and Mac. The updated driver causes fewer sample rate corrections to occur.

Please test on various Windows platforms. If this turns out to be stable and good I'll pack it into an installer as well. For now it's just a new .dll file which goes on top of an existing installation.

Download and instructions: http://code.google.com/p/sdr-widget/...e=asiouac2.dll

Updated code: https://github.com/nikkov/Win-Widget/tree/master/uaclib

Børge

borges · 24th January 2013, 08:52 PM

Update: I've done hours and hours of 44.1 testing on Linux, Mac and Win+ASIO. The three now seem to behave very similarly. To stabilize the host the firmware never seems to have to increase or decrease its reported frequency by more than five steps of 64 in the same direction. Normally 2-3 steps are sufficient.

Børge

UnixMan · 25th January 2013, 12:46 PM

Quote:

Originally Posted by borges

Update: I've done hours and hours of 44.1 testing on Linux, Mac and Win+ASIO. The three now seem to behave very similarly. [...]

UAC1 or UAC2? (since you're talking about ASIO, I guess the latter)

With which firmware version? audio_widget_20130113.elf or some new experimental one?

What about 48/96/192 ?

borges · 25th January 2013, 12:56 PM

It's the Windows driver on UAC2. The updated .dll should work with most firmware versions.

The driver used to operate very differently on 44.1*2^n and 48*2^n. On the latter it used to be a lot like Linux and Mac, on the former it required frequent correction. With the modified code all modes look like they do on Linux and Mac.

Børge

scopeboy · 4th February 2013, 11:34 AM

Any tips on adding a SPDIF output to the AB-1.2 DAC? I know SPDIF is evil

but I want to build another of these Raspberry Pi things for my other system, and it has digital room correction, so needs a digital input.

borges · 4th February 2013, 11:46 AM

Follow my signature and check out the ES9012/18 prototype section :-)

The AB-1.12 / 1.13 prototype boards have SPDIF TX options. The only downside is that you'll have to assemble the analog board yourself.

Børge

scopeboy · 4th February 2013, 01:42 PM

Are you happy with the WM8804? I have some CS8406 somewhere, but I'd use the WM8804 if you've already tested it and got good results.

borges · 4th February 2013, 01:44 PM

I haven't tested it thoroughly. But it played anything I fed it right out of the box.

Borge

scopeboy · 4th February 2013, 02:03 PM

Cool :-) But before I do that, I ought to try hooking up a separate analog power supply to the AB-1.2 I already have.

Have you tried disabling the charge pump on the AK4430 and feeding it with an external negative supply?

17th January 2013, 09:14 PM	#2101
scopeboy diyAudio Member Join Date: Mar 2002 Location: scotland	I posted my findings over in the Raspberry Pi thread: Raspberry Pi -A New DIY'ers Digital Hub? With the config I posted there, as far as I can see it is glitch-free as long as there are no USB1.x devices in the system. But if one is connected, such as a keyboard, it'll cause the occasional pop even if you never press any keys. This means I have to scrap my USB HID user interface. However it is so easy to control from a smartphone or tablet, that I'm questioning whether I needed the UI in the first place. __________________ 'Like the thirteenth chime from a crazy clock which not only in itself fails to command belief but also casts a certain doubt upon the accuracy of the previous twelve strokes.'

22nd January 2013, 12:31 PM	#2102
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	The driver source code has been modified for Win+ASIO at 44.1/88.2/176.4 to behave more like UAC2 on Linux and Mac. The updated driver causes fewer sample rate corrections to occur. Please test on various Windows platforms. If this turns out to be stable and good I'll pack it into an installer as well. For now it's just a new .dll file which goes on top of an existing installation. Download and instructions: http://code.google.com/p/sdr-widget/...e=asiouac2.dll Updated code: https://github.com/nikkov/Win-Widget/tree/master/uaclib Børge __________________ === AB-1.2 and USB-I2S Module === Audio Widget readme === Last edited by borges; 22nd January 2013 at 12:33 PM.

24th January 2013, 08:52 PM	#2103
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	Update: I've done hours and hours of 44.1 testing on Linux, Mac and Win+ASIO. The three now seem to behave very similarly. To stabilize the host the firmware never seems to have to increase or decrease its reported frequency by more than five steps of 64 in the same direction. Normally 2-3 steps are sufficient. Børge __________________ === AB-1.2 and USB-I2S Module === Audio Widget readme ===

25th January 2013, 12:56 PM	#2105
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	It's the Windows driver on UAC2. The updated .dll should work with most firmware versions. The driver used to operate very differently on 44.12^n and 482^n. On the latter it used to be a lot like Linux and Mac, on the former it required frequent correction. With the modified code all modes look like they do on Linux and Mac. Børge __________________ === AB-1.2 and USB-I2S Module === Audio Widget readme ===

4th February 2013, 11:34 AM	#2106
scopeboy diyAudio Member Join Date: Mar 2002 Location: scotland	Any tips on adding a SPDIF output to the AB-1.2 DAC? I know SPDIF is evil but I want to build another of these Raspberry Pi things for my other system, and it has digital room correction, so needs a digital input. __________________ 'Like the thirteenth chime from a crazy clock which not only in itself fails to command belief but also casts a certain doubt upon the accuracy of the previous twelve strokes.'


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4th February 2013, 11:46 AM	#2107
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	Follow my signature and check out the ES9012/18 prototype section :-) The AB-1.12 / 1.13 prototype boards have SPDIF TX options. The only downside is that you'll have to assemble the analog board yourself. Børge __________________ === AB-1.2 and USB-I2S Module === Audio Widget readme ===

4th February 2013, 01:42 PM	#2108
scopeboy diyAudio Member Join Date: Mar 2002 Location: scotland	Are you happy with the WM8804? I have some CS8406 somewhere, but I'd use the WM8804 if you've already tested it and got good results. __________________ 'Like the thirteenth chime from a crazy clock which not only in itself fails to command belief but also casts a certain doubt upon the accuracy of the previous twelve strokes.'

4th February 2013, 01:44 PM	#2109
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	I haven't tested it thoroughly. But it played anything I fed it right out of the box. Borge __________________ === AB-1.2 and USB-I2S Module === Audio Widget readme ===

4th February 2013, 02:03 PM	#2110
scopeboy diyAudio Member Join Date: Mar 2002 Location: scotland	Cool :-) But before I do that, I ought to try hooking up a separate analog power supply to the AB-1.2 I already have. Have you tried disabling the charge pump on the AK4430 and feeding it with an external negative supply? __________________ 'Like the thirteenth chime from a crazy clock which not only in itself fails to command belief but also casts a certain doubt upon the accuracy of the previous twelve strokes.'

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