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kken

1,568 karma · joined January 3, 2013

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kken··on LED circuits, theory, applications and tips
This looks a bit like SEO spam. All of the articles barely have any content and are only accessible via key words.
kken··on The 3dfx Voodoo1
Nice article. I would be interested in learning more about the rendering pipeline. Is anybody aware of a more detailed description? Or an online datasheet?

Btw - already EDO DRAM favours reading entire memory blocks/lines. My suspicion is that the trick in increausing memory bandwidth is not only based on interleaving, but also on block transfers with on-chip caching. Especially critical for texture reads.

The Voodoo is a nice example of how much execution matters. They were not the only ones to follow this path back then, but by only concentrating on the core functionality they managed to beat all others to the market without compromise. (Compare to S3 Virge, Matrox Mystique, Nvidia NV1, Tseng, NEC and many others)

kken··on When Jeff Bezos decided not to become a physicist [video]
Most likely, you will only know when they have passed.
kken··on Livox Mid-40 lidar sensor
> but how will this perform if there is not the occasional car making test runs through town, but when all vehicles on a busy road or intersection are equipped

This is called "jamming" and was a real problem for early radar solutions.

Curiously you well rarely see anyone mention this in the LIDAR space. For many of startups adressing this issue seems to be an afterthough.

One proper way to solve this is to use orthogonal codes in the scanning scheme. There are different ways to implement this. The complexity depends a lot on the used LIDAR architecture. It would not be surprising to see some of the startup being weeded out by that during real-world tests.

kken··on Livox Mid-40 lidar sensor
All specs are defined for 80% reflective objects? What do they assume here? A retroreflective street sign?

Unfortunately there are no standards (yet) to benchmark different LIDAR solutions, but most of their competitors stick to more realistic assumptions.

Then, in general, the website is light of any tangible information:

- Company information: Management, History, Size, Investments, strategic partners, location of company

- Concrete working principle of their LIDAR: Detector principle, wavelengths, laser type used, means of scanning, optical aperture

- Images of actual hardware

- Does their price-tag still apply after they have managed to implement proper functional safety processes and measures?

Very weak, especially considering how much competition is out there. There seems to be a new LIDAR start up every other weak.

kken··on DAN64, an AVR based 8-bit microcomputer
>AVRs, like ARM Cortex, are SOCs (System On a Chip) but have really excellent peripheral devices compared to the ARM Cortex I've used.

A 100% seconded. Check out their new line of ATtiny devices. They start at 0.30USD/pc, but come with every peripheral one could imagine.

Most lower end Cortexes only come with bare bone peripherals and are encumbered with poor glue logic like multi cycle GPIO access or flash waitstates.

kken··on Ask HN: What skills to acquire in 2019?
>The end of copper clad fiberglass boards are in sight, and that will change the way we think about electronics in fabrication.

That's an interesting thought. But where would this lead us?

kken··on Ask HN: What skills to acquire in 2019?
A much faster way to understand the central message of "Start with Why" would be to watch the TEDx talk:

https://www.youtube.com/watch?v=u4ZoJKF_VuA

Is the book worth reading, in addition? I see very mixed reviews.

kken··on Millitext – A subpixel text encoding font
Well, this seems certainly straight forward from an information theory angle of view:

- Each pixel represents one bit.

- Hence, we should try to increase information entropy.

That's all there is to it? Certainly not, since we are creating something for human consumption. There are a couple of other factors:

- The way the eye processes patterns: lateral inhibition [1]

- The way the eye processes colours: photopic vision [2]

- The way the brain interprets patterns

- The way the brain can actually interpret ingoing information.

I don't have an answer to all of these. But is pretty certain that maximizing entropy of a binary pattern is not equivalent to optimiziung reading speed.

[1] https://en.wikipedia.org/wiki/Lateral_inhibition

[2] https://en.wikipedia.org/wiki/Photopic_vision

kken··on Karl Friston: a neuroscientist who might hold the key to true AI
The article is too long for the idea it tries to convey. I like to read to broaden my mind, not for readings sake.
kken··on SymbiFlow: A FOSS Verilog-to-Bitstream FPGA synthesis flow for Various FPGAs
I wonder, wouldn’t some of the Chinese fpga startups be more receptive to cooperate with an open source project?

The Eda industry is ripe for disruption, and it seems the incumbent Chinese semi players may become the catalyst. See also, how they embraced RISC-V.

kken··on Tesla Model 3 vs. Amtrak's Acela Express: The Electric Future Acid Test
What is the problem? Lyon has a fully developed system of trams and subways. It's directly connected to the TGV train station.

http://www.tcl.fr/var/tcl/storage/original/application/b8cb6...

kken··on The art of creating very tiny programs for the 80x86 family of CPUs
https://amycoders.org/
kken··on Pixelblaze V2 – An advanced LED pattern development engine and controller
Funny how people always jump to conclusions when it comes down to people enforcing their patents. My understanding of this drama is, that APA is a small taiwanese startup that was actually the first company with a RGB LED with integrated driver. There are a bunch of chinese companies that are more or less copying their products and are pushing them on the market at much lower price and more agressive marketing.

It surely looks to me as if they are using patents in their originally intended way. The downside is that they are hitting vendors with a C&D instead of going to the source. But that could rooted in the difficulties surrounding the ability of a taiwanese company to sue a china mainland one...

kken··on Apple dropping Intel as radio chip supplier, killing off the product – report
Depends on what you call "State of the art"? Cutting edge logic processes are a domain of Intel, TSMC, Samsung, GF and the incumbents in China.

But for everything else, like IoT, Sensors, Power, you can find plenty of companies and subsidiaries in Germany: Infineon, Bosch, GlobalFoundries, NXP, Dialog, Elmos, Melexis, Xfab, AMS, IDT (ZMDi), TI, Intel, TDK (Micronas) and many smaller ones.

kken··on Tell HN: I miss the old internet
Why did the USENET have to disappear?
kken··on Tell HN: I miss the old internet
how to discover new irc channels/servers?
kken··on 6502 arithmetic and why it is terrible
Especially on microcontrollers or DSPs this could be quite useful. I have never seen a C-compiler able to infer a bit rotation instruction, though.
kken··on 6502 arithmetic and why it is terrible
There is an important difference: BASIC is interpreted, not compiled.
kken··on 6502 arithmetic and why it is terrible
Well, the 6502 is simply not made to be programmed in a high level language.

Note that there are many instructions that simply don't map to high level language features, such as bit rotation (not shift!), BCD mode and indirectly indexed adressing.

One thing that it very popular in highly optimized 6502 assembler code is self-manipulating code or even run-time generated code. This allows to work around a lot of limitations with indexed adressing or parameter loading.

The 6502 was designed at a time when CPUs were not limited by memory speed. I imagine that has only been the case right after the emergence of the first MOS-Memory (Intel, late 60ies)

Edit: For those interested in state of the art optimized 6502 arithmetic, this is a very good source:

http://codebase64.org/doku.php?id=base:6502_6510_maths

kken··on Ask HN: Recommendations on books and documentaries on tech companies/people?
This. Also

"Spinoff" by Charlie Sporck - early Silicon Valley history on Semi companies

"Commodore - a company on the edge" by Brian Bagnall

"Only the paranoid survive" by Andy Grove - Intels switch to Microprocessors. (Interestingly you can see in the book that he realized the power of the internet, but failed to act on it to some extend)

kken··on Keurig to Acquire Dr Pepper Snapple in Largest Soft-Drink Deal Ever
Interesting change of perspective.

News article from the US (Texas): https://www.texasmonthly.com/the-culture/dr-pepper-keurig/ "The Yanks Have Bought Dr Pepper"

News article from Germany: http://www.handelsblatt.com/unternehmen/handel-konsumgueter/... "German billionaire family Reimann buys Dr. Pepper"

I guess both are true, since Keurig is still a US run company, although its majority is owned by JAB holding.

kken··on The U.S. Gets Less Subway for Its Money Than Its Peers
>Groceries

Are you serious? Groceries in the US are surprisingly expensive compared to Europe.

kken··on Forking the iPhone
The author:

https://en.wikipedia.org/wiki/Jean-Louis_Gass%C3%A9e

kken··on Sci-Hub’s cache of pirated papers is so big, subscription journals are doomed
Well, this is linking to IEEE. I have mixed feelings about this, since IEEE is actually doing a good job about publishing. They have far better reviews than most other journals, and members free get access to most journals anyways.
kken··on Ask HN: Those in Europe making €100K+ annually, what is your job like?
The salary scale for jobs paid according to tariff in the electronic (IG Metall) or chemical industry in Germany ends at around 100k€. This can be reached if you stay at the same company for a reasonably long time and don't fuck up. This is far from entry level salary though and most people only reach this in their 30ier or 40ies.

Senior technical expert and management positions are usually paid above tariff, starting at around 100k€.

There are plenty of positions in the big tech companies and software that are paid above 100k€. It's just very unlikely to get there if you are straight from school. Also, you won't have much luck finding >100k€ positions in the eastern part of Germany.

kken··on Intel’s Mark Bohr on the push into multi-chip solutions and issues at 5nm/7nm
Yes, but not for 50 years. That's how long moores law is in effect already.
kken··on Magic Leap Could Be Looking at an $8B Valuation
I agree, they tried to do more than they should have.

A general issue I see, however, is that the real world need for flexible displays is far more limited than earlier projections suggested. If you switch to a rigid display, there is no reason to use an organic transistor back plane - that's where things start to unravel. PL were not even the first company in that space. There also were Polymervision and a couple of others.

kken··on Magic Leap Could Be Looking at an $8B Valuation
>One of my favorite poster children for this is Plastic Logic.

Basically the entire organic transistor community has a solution in search of a problem. Not really an issue limited to Plastic Logic.

kken··on The licensing program for MP3-related patents has been terminated
Karlheinz Brandenburg... Stockhausen was a composer.
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