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1  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: February 16, 2013, 02:23:37 am
I have my Due working with sound from a Galaxy Nexus but the quality is pretty poor. I put a 1KHz tone on my phone and played it through the Due and it quickly becomes apparent that there is something wrong. There are gaps in the audio which don't seem to be periodic. On the scope I see small gaps about a millisecond long. The gaps happen about every 100msec (or so). After the gap, the output continues at the same voltage which makes me think the dac might be sending the same value during the gap until more data is available. Anyone else observe this?

Can you control volume when audio out via Due?  I could not adjust volume when output audio via Due.
2  Using Arduino / Audio / Re: Arduino DAC on: January 24, 2013, 04:15:27 am
Quote
Where can we find the academic paper:
The effects of alcohol on perceived quantization noise
It was in the American Journal of Audiology, I saw it in my university libary in 1974 in a bound volume so it was some years before that.
So we can't find it in internet. or can we get a soft copy?
3  Products / Arduino Due / Is ADK 2011 Board like Seeed mega2560 boad compatible with ADK 2012? on: January 24, 2013, 12:13:47 am
Is ADK 2011 Board like Seeed mega2560 boad compatible with ADK 2012? I tried to upload sketch to ADK 2011 board on IDE 1.5.1. But I get error message like "ADK2012.ino:2:21: error: variant.h: No such file or directory" and others.
Have you any idea about this? Thanks
4  Products / Arduino Due / Re: Problem installing Due driver on: January 24, 2013, 12:03:43 am
Probably it is installing driver problem of Windows like driver signed problem. Search it in internet.
5  Using Arduino / Audio / Re: Arduino DAC on: January 24, 2013, 12:00:03 am
The newest Due board supports DAC out audio. Could you test it? The Due is compatible wtih ADK 2012.
6  Using Arduino / Audio / Re: Arduino DAC on: January 23, 2013, 11:56:21 pm
Quote
I trim it just by listening to the sound. Therefore I play a low volume audio part and adjust the trimmer to minimum audible noise
Fair enough.
Quote
Of course, that DAC never reaches true 16 bit
Yes that's right.

There are two main causes of noise in a digital audio system, one is quantization noise of the amplitude of the signal, and the other is the noise introduced by the quantization of time or sampling period. By over sampling you can cut down the latter but the former is down to the number of bits on the D/A I got very good results in the 70s with 13 bit converters, which in those days cost the same as three months research grant.

The best titled academic paper I read during my lit search was:-
The effects of alcohol on perceived quantization noise.

Which surprise surprise concluded that the more alcohol you gave some on the less they noticed quantization noise.

Where can we find the academic paper:
The effects of alcohol on perceived quantization noise
7  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 20, 2013, 09:58:09 pm
In that case it must be the way the Due is representing itself.  What sketch have you loaded on the Due?

ADK 2012 should recognize the Due on Nexus 7. But waited a long time more than 5 minutes, ADK 2012 could not start correctly, it was forced stopped.
GS3 still could not recoginze the Due. I have loaded the sketch from Ardroid on this post.
8  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 20, 2013, 04:09:10 am
The GS3 and the Nexus 7 can both recognize the Due with ADK 2012, I've tested with both. Are you running a custom ROM or kernel?  Perhaps one that leaves out USB accessory mode?

I use stock rom with rooted.
The GS3/Nexus 7 recognized the Due as "connected to a USB accessory". But ADK 2012 couldn't recognize the Due.
Connection:
PC-->USB Cable-->Programming Port on Due
Nexus 7/GS3-->USB Cable-->OTG-->Native Port on Due.
9  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 20, 2013, 03:18:54 am
Succeeded to upload your code into the Due. But the Nexus 7 or GS3 can't recognize the Due with ADK 2012/2011. Can you do it? Thanks.
10  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 15, 2013, 12:08:31 pm
Thanks. I resoved it. I should choose correct board--Arduino Due. Compiled successfully after I choosed board--Arduino Due.
11  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 10, 2013, 11:16:06 am
Got following error when I compiled your code above on ADK2012 IDE or Arduino 1.5.1r2.

C:\Users\user\AppData\Local\Temp\build5437525985664053003.tmp\sketch_jan11a.cpp.o
sketch_jan11a.ino:4: fatal error: ADK.H: No such file or directory
compilation terminated.
12  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 10, 2013, 10:05:28 am
Thanks.
Is it possible to output Audio from ADK2011 board?
13  Products / Arduino Due / Re: Cannot run include files. Getting 'No such file or directory' for any include. on: January 10, 2013, 05:30:54 am
Incredible how this problem does continue.  I am able to get the program to compile.  However, when I try to upload it via the Programming Port, it then claims it cannot find the very include file that I had the original problem with, server.h.  If I change it to the Native USB Port, it compiles but then cannot upload.  This Due is becoming quite frustrating!

You should use Native USB to upload on Windows 7. Need to press the erase buttion for a few seconds before uploading.
14  Products / Arduino Due / Re: No device found on COM5 with Bossac on Winwdows 7 on: January 10, 2013, 05:24:08 am
In my experience, We should use Native USB on Deu to upload sketch into Due on Windows 7&8. Also, need to press the erase button for a few seconds before uploading.
15  Products / Arduino Due / Re: Arduino Due and ADK 2012 on: January 09, 2013, 12:20:24 pm
Thanks your summary.

New question:
Can’t change the volume on Nexus 7 when output audio via MicroUSB. The default volume is max volume. Do you have any ideas about it? Thanks.
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