2012-03-13 00:09 wpwrak: the case fits on a atben? 2012-03-13 00:10 or are you getting ready to free memory sticks readers? ;-) 2012-03-13 00:10 but looks nice 2012-03-13 00:10 ! 2012-03-13 00:43 Fernandos has quit [#qi-hardware] 2012-03-13 00:56 cladamw has joined #qi-hardware 2012-03-13 01:04 DocScrutinizer: could you hint me a case where a white noise generator is desirable? 2012-03-13 01:04 my intiution says there are enough valid ones to put a hw lfsr in a uC DAC, but I couldn't think of any 2012-03-13 01:04 kristianpaul has joined #qi-hardware 2012-03-13 01:04 kristianpaul has joined #qi-hardware 2012-03-13 01:05 adjusting audio equipment 2012-03-13 01:06 ah. stupid me, ST has listed applications in the appnote 2012-03-13 01:06 "electronic music, <...> testing frequency response, sound masking with a Tinnitus masker 2012-03-13 01:07 and, er, "oversampling with white noise"? 2012-03-13 01:07 there's an AN link, but it is defunct :/ 2012-03-13 01:07 testing freq response was exatly what I meant 2012-03-13 01:09 DocScrutinizer: I don't quite get how you could ever _increase_ SNR by _adding white noise_ 2012-03-13 01:09 if you add white noise to a signal, then A/D convert it severla times, you can get higer accuracy than your ADconverter has digits/bits 2012-03-13 01:09 well, that's what it means. but why does it work that way? 2012-03-13 01:09 won't ADC give you better precision without noise? 2012-03-13 01:09 statistics 2012-03-13 01:10 hm. like if the value is between two values, then by adding noise you "diffuse" it between the values and some measurements will show one and other ones another, and thus the average would be better? 2012-03-13 01:10 *two ADC presets, or how are they called 2012-03-13 01:10 yep 2012-03-13 01:11 it's basically dithering 2012-03-13 01:12 if you get 90 probes N and 10 N+1, then your atual value is N+0.1 2012-03-13 01:12 ah, I got it. by adding white noise you increase the perceived resolution of ADC near your desired value, given that the value doesn't change more than zero "raw" ADC bits during the measurement 2012-03-13 01:12 yes 2012-03-13 01:12 i.e. you could get the same by offseting the ADC with a DAC, but a white noise generator is way cheaper 2012-03-13 01:13 what a clever idea 2012-03-13 01:13 ... wait, they generate white noise with a DAC 2012-03-13 01:14 and by not using a fixed sawtooth signal you average out any irregularities in the measurement 2012-03-13 01:14 seriously, this is incredibly clever. 2012-03-13 01:18 DocScrutinizer: am I right that for uninterrupted audio play with DMA I generally need two buffers, and when one empties I switch to another and fill the empty one? 2012-03-13 01:19 ,usually you do it that way 2012-03-13 01:19 oftren with more than 2 2012-03-13 01:20 8k of RAM 2012-03-13 01:20 so, I think 2 are enough 2012-03-13 01:20 rejon has joined #qi-hardware 2012-03-13 01:20 xiangfu has joined #qi-hardware 2012-03-13 01:20 depends on your source process' worst case latency 2012-03-13 01:21 but I have to go back to sleep now, sorry 2012-03-13 01:21 ok, thanks a lot 2012-03-13 01:21 YW :) 2012-03-13 01:28 whitequark: check manpage of sox, I think there's also been a usecase of white noise added to improve sound (anti-aliasing) 2012-03-13 01:30 or was it quantisation noise ? 2012-03-13 01:39 kristianpaul: ah no, that's not for atben. i think atben would be best handled by some thin silicone coating. something as hydrophile as wood would be the last thing i'd consider for 2.4 GHz technology :) (alright, second to last. metal would be worse :) 2012-03-13 01:49 DocScrutinizer51: insomnia? :) 2012-03-13 01:50 btw you're right, it's to deter quantisation noise. basically the same thing as I understand it 2012-03-13 01:52 indeed, each time the phone yells with highlight 2012-03-13 01:54 panda|x201 has joined #qi-hardware 2012-03-13 01:56 wpwrak: I tried to put a logo (er, Aperture Science logo) on the case and utterly failed 2012-03-13 01:56 can you guess how? :) 2012-03-13 01:56 on what case ? 2012-03-13 01:56 of my device 2012-03-13 01:56 which I try to make in a CAD 2012-03-13 01:57 and which will be laser cut 2012-03-13 01:57 hmm. many possibilities of failure :) 2012-03-13 01:57 ah, laser. that eliminates weak fixtures :) 2012-03-13 01:57 laser cutting better than planned ? :) 2012-03-13 01:58 nah, not even a single run (thankfully) 2012-03-13 01:58 well, you know, there's some letters like A and R 2012-03-13 01:58 and P 2012-03-13 01:58 i actually wonder what the tables of laser cutters are made of 2012-03-13 01:58 where you have a central element which would certainly fall out 2012-03-13 01:58 several decades ago, people made forms for spray painting 2012-03-13 01:59 they solved your problem :) 2012-03-13 01:59 yes. I seen them. but the letters with thin guides aren't so visually attractive as letters without them 2012-03-13 01:59 apart from that, laser tends to overheat thin parts afaik 2012-03-13 02:00 ah, the hard choice between a flawed tangible result and an unattainable ideal :) 2012-03-13 02:00 so, er, I think I'll inscribe it, again with laser. every fab I seen offers both of the services. shouldn't be hard to convince them 2012-03-13 02:00 and it won't hurt if it'll get moved by a few mm away 2012-03-13 02:00 yes, engraving is possible 2012-03-13 02:01 we even have it on m1 :) 2012-03-13 02:01 yeah, I feel that my case will be a straight m1 case ripoff 2012-03-13 02:01 it even looks quite the same 2012-03-13 02:01 after a few iterations 2012-03-13 02:01 (the first one would just fall apart.) 2012-03-13 02:04 wpwrak: maybe you have any idea what format should I store 8K, 8-bit, 1-channel audio data? 2012-03-13 02:04 s,data?,data in?, 2012-03-13 02:04 ima adpcm is bigger than raw u8 2012-03-13 02:06 ah, nevermind, it is not. I specified wrong conversion settings 2012-03-13 02:06 depends on many factors. like space constraints, what you do with it, processing capabilities, and so on 2012-03-13 02:07 in general, the simpler, the better :) so WAV/u8 are great. 2012-03-13 02:08 not fitting into the flash 2012-03-13 02:08 and SPI flashes over 128k are somewhat more expensive/hard to get than I expected 2012-03-13 02:08 and I _really_ don't want to put an SD card in because of 160k of audio data 2012-03-13 02:09 lower the sample rate ? ;-) 2012-03-13 02:11 under 8k? this degrades the quality substantially 2012-03-13 02:11 similarly I have no benefit of using >8k because: a) it's voice b) it's transmitted via gsm 2012-03-13 02:16 wpwrak: ADPCM decoder is like seriously huge 2012-03-13 02:16 with 118 bytes of code and 176 bytes of LUT 2012-03-13 02:22 wpwrak: also, have you considered using clang for your projects? 2012-03-13 02:23 for me it gives a 10% code size decrease over gcc, both being untweaked 2012-03-13 02:23 gcc is with -Os and clang is with -Os -flto 2012-03-13 03:26 panda|x201 has joined #qi-hardware 2012-03-13 03:55 rejon has joined #qi-hardware 2012-03-13 04:49 green` has joined #qi-hardware 2012-03-13 05:10 GeorgeH has joined #qi-hardware 2012-03-13 05:12 losinggeneration has joined #qi-hardware 2012-03-13 05:21 losinggeneration has joined #qi-hardware 2012-03-13 05:31 cladamw has joined #qi-hardware 2012-03-13 05:33 killertux has joined #qi-hardware 2012-03-13 05:45 panda|x201 has joined #qi-hardware 2012-03-13 05:57 rejon has joined #qi-hardware 2012-03-13 06:36 valhalla has joined #qi-hardware 2012-03-13 06:41 wolfspraul has joined #qi-hardware 2012-03-13 06:45 wej has joined #qi-hardware 2012-03-13 06:53 jekhor has joined #qi-hardware 2012-03-13 06:56 wej has joined #qi-hardware 2012-03-13 07:14 wej has joined #qi-hardware 2012-03-13 07:24 LunaVorax has joined #qi-hardware 2012-03-13 07:39 zrafa has joined #qi-hardware 2012-03-13 07:51 panda|x201 has joined #qi-hardware 2012-03-13 08:00 wpwrak has joined #qi-hardware 2012-03-13 08:32 kuribas has joined #qi-hardware 2012-03-13 08:59 cladamw has joined #qi-hardware 2012-03-13 09:00 [commit] Xiangfu: xburst: nanonote: fix update config-3.2 on sound driver (master) http://qi-hw.com/p/openwrt-xburst/1723a7c 2012-03-13 09:17 unclouded has joined #qi-hardware 2012-03-13 09:30 rejon has joined #qi-hardware 2012-03-13 09:34 The build has FAILED: http://fidelio.qi-hardware.com/~xiangfu/building/Nanonote/Ben/openwrt-xburst.minimal-20120313-1029 2012-03-13 09:38 * xiangfu start the xburst minimal build with CONFIG_ALL=y. we will find out later how many package failed to build under gcc 4.6 and uClibc 0.9.33 2012-03-13 09:38 after about 5 days I finally manually build a image : http://fidelio.qi-hardware.com/~xiangfu/build-nanonote/openwrt-xburst.full_system-20120313-M/ 2012-03-13 09:39 rebase with recently opewnrt. update kernel to v3.2.1 2012-03-13 09:50 rozzin has joined #qi-hardware 2012-03-13 09:55 marcan has joined #qi-hardware 2012-03-13 09:55 zear has joined #qi-hardware 2012-03-13 09:55 whitequark has joined #qi-hardware 2012-03-13 09:59 wej has joined #qi-hardware 2012-03-13 10:05 LunaVorax has joined #qi-hardware 2012-03-13 10:18 http://www.terraelectronica.ru/images/SOC8200.jpg 2012-03-13 10:18 this board certainly has enough decoupling 2012-03-13 10:29 jluis has joined #qi-hardware 2012-03-13 10:33 DocScrutinizer has joined #qi-hardware 2012-03-13 10:44 antoniodariuh_ has joined #qi-hardware 2012-03-13 10:48 unclouded has quit [#qi-hardware] 2012-03-13 10:49 The build was successful: http://fidelio.qi-hardware.com/~xiangfu/build-nanonote/openwrt-xburst.minimal-20120313-1035 2012-03-13 10:53 jivs_ has joined #qi-hardware 2012-03-13 11:01 Ayla has joined #qi-hardware 2012-03-13 11:13 [commit] Xiangfu: nanonote-files: config.minimal: add CONFIG_ALL for build script file (master) http://qi-hw.com/p/openwrt-packages/b1bf002 2012-03-13 11:45 [commit] Xiangfu: nanonote-files: config.full_system add kmod-lib-crc-ccitt (master) http://qi-hw.com/p/openwrt-packages/9cee283 2012-03-13 12:01 cladamw has joined #qi-hardware 2012-03-13 12:06 kyak has joined #qi-hardware 2012-03-13 12:12 The build was successful: http://fidelio.qi-hardware.com/~xiangfu/build-nanonote/openwrt-xburst.minimal-20120313-1159 2012-03-13 12:16 wej has joined #qi-hardware 2012-03-13 12:27 hooray 2012-03-13 12:27 finally, tuxbrain's pkg has arrived 2012-03-13 12:35 whitequark: good! 2012-03-13 12:38 jow_laptop has joined #qi-hardware 2012-03-13 12:49 jivs_ has joined #qi-hardware 2012-03-13 12:57 jekhor has joined #qi-hardware 2012-03-13 13:19 jivs has joined #qi-hardware 2012-03-13 14:09 panda|x201 has joined #qi-hardware 2012-03-13 15:08 urandom__ has joined #qi-hardware 2012-03-13 15:17 emeb has joined #qi-hardware 2012-03-13 15:54 jluis has joined #qi-hardware 2012-03-13 16:25 GNUtoo has joined #qi-hardware 2012-03-13 16:36 The build has FAILED: http://fidelio.qi-hardware.com/~xiangfu/building/Nanonote/Ben/openwrt-xburst.minimal-20120313-1636 2012-03-13 16:57 LunaVorax has joined #qi-hardware 2012-03-13 17:17 panda|x201 has joined #qi-hardware 2012-03-13 17:47 wpwrak has joined #qi-hardware 2012-03-13 18:10 wpwrak: HAH, your licky day with the characteristics of those particular LEDs you use. Some may easily start shining at < 1/3 nominal U(forward) 2012-03-13 18:11 lucky even 2012-03-13 18:11 ;-) 2012-03-13 18:11 esp when mixing e.g red and green or (God forvid) blue 2012-03-13 18:12 yeah, with blue in the mix, abandon all hope :-) 2012-03-13 18:12 s/v/b 2012-03-13 18:12 DocScrutinizer meant: "esp when mixing e.g red and green or (God forbid) blue" 2012-03-13 18:12 duh 2012-03-13 18:12 this bot is way too permissive 2012-03-13 18:12 (bot) why ? it worked 2012-03-13 18:13 yeah, though it was meant not to do 2012-03-13 18:13 ;-) 2012-03-13 18:13 s/o/x 2012-03-13 18:13 DocScrutinizer meant: "yeah, thxugh it was meant nxt tx dx" 2012-03-13 18:13 ;-P 2012-03-13 18:13 s/u/x! 2012-03-13 18:14 kilae has joined #qi-hardware 2012-03-13 18:29 urandom_ has joined #qi-hardware 2012-03-13 18:59 jekhor has joined #qi-hardware 2012-03-13 19:10 jurting has joined #qi-hardware 2012-03-13 19:17 antoniodariuh_ has joined #qi-hardware 2012-03-13 19:29 lindi- has joined #qi-hardware 2012-03-13 20:23 antgreen has joined #qi-hardware 2012-03-13 20:53 kyak has joined #qi-hardware 2012-03-13 21:48 Hi everyone! 2012-03-13 21:48 Hello 2012-03-13 21:55 jow_laptop has joined #qi-hardware 2012-03-13 22:09 wpwrak has joined #qi-hardware 2012-03-13 23:41 panda|x201 has joined #qi-hardware 2012-03-13 23:44 hi