03:37 <qu1j0t3> anyone here know the YM3014B well?

03:39 <qu1j0t3> hm actually the datasheet might be clear enough on this point. I want to feed a reference into MP that is not divided from Vdd. (i.e. not Rb)

03:40 <cr1901> wq did an impl for glasgow. I also did an impl of it years ago, but mine had bugs wq didn't

03:40 <qu1j0t3> i'm sure i've done this before but just doubted myself for a bit.

03:41 <qu1j0t3> i'm trying to get back into a project i began with these 4+ years ago. for some reason i just like the 3014B for coefficient generation...

03:47 <qu1j0t3> it has the right properties

03:47 <qu1j0t3> i.e. i'd like more precision for lower magnitudes.

05:18 <Lord_Nightmare> if ken shirrif is around: I believe that trick that the yamaha DX7 OPS/EGS chip uses for packing the exponent table in such a way (storing the base value and slope in the same ROM and possibly having a second ROM lookup for slope to convert to linear) is what harold G. "Hal" Alles called an 'augment table' and was invented at bell labs for use in their synthesizer platform around 1975

05:18 <Lord_Nightmare> the same trick is also used in the roland LA32 chip to pack the exp table, although a simpler variant

05:19 <Lord_Nightmare> it allowed using an 8 or 12 bit wide ROM to store data as a sort of piecewise series of slopes, to produce a 16-bit wide result

05:19 <Lord_Nightmare> and combining this with mirroring of quadrants on a square wave, could achive a lot of effetive compression

05:20 <Lord_Nightmare> an exp table doesn't have mirrored quadrants though

05:21 <Lord_Nightmare> James A. Moorer's synthesizer is related to both chowning's FM synth patent an alles' patent for the bell labs synth, but might not use the augment idea in favor of instead using two 8-bit roms to store a linear 16 bit value

06:58 <Lord_Nightmare> https://patents.google.com/patent/US4201105A/en is the hal alles/bell labs patent

06:58 <NiGHTS> US4201105A - Real time digital sound synthesizer - Google Patents

06:59 <Lord_Nightmare> https://patents.google.com/patent/US4833963 is the patent on the kurzweil K150, which also used the augment table trick

06:59 <NiGHTS> US4833963A - Electronic musical instrument using addition of independent partials with digital data bit truncation - Google Patents

07:01 <Lord_Nightmare> the augment table trick (at least the simpler version of it) is clever since it means you can store a relatively low resolution lookup table and as part of the value being looked up, a slope (either an absolute slope or a slope index value so the slope will be looked up in another smaller ROM, possibly with part of the index value coming from the higher bits of the big ROM too)

07:01 <Lord_Nightmare> and the using said slope plus the lower order address bits that don't go to the low-res 'big' rom, combine together to interpolate the low bits of output

07:01 <Lord_Nightmare> its a very clever hack

07:03 <Lord_Nightmare> I made a version of the roland la32 EXP table in a C file which uses the exact ROM (actually it generates it itself so no copyright infringement, its a simple math table representable by an equation so can't really be copyrighted) that the original die uses

07:03 <Lord_Nightmare> and uses the augment table to generate the interpolated values

17:10 <tunixman> bluetooth audio is a shitshow when basically everything is in the 2.4GHz band.

17:10 <tunixman> s/bluetooth//

17:11 <tunixman> Thanks NiGHTS. I couldn't either.

17:11 <NiGHTS> You're welcome, tunixman! :D

17:11 <tunixman> awwww!

17:11 <tunixman> I love our bot!

19:57 <cr1901> tunixman: Thank KitsuWhooa for the neighborhood-friendly bot :)

20:25 <cr1901> endrift: Psst! I think internally, the Artix 35T might actually be a 100T, but Xilinx locks you to a lower size device

20:26 <cr1901> So if you buy an Arty 35T now, you may have a Arty 100T later when free tools mature

20:26 <cr1901> But don't tell anybody

20:40 <gewt> free tools for xilinx stuff is being worked on?

20:59 <cr1901> gewt: /join #symbiflow for more info. There's also nextpnr-xilinx that gatecat was working on a while ago. Not sure the status of that

20:59 <gewt> neat

21:08 <andlabs> analog cat

21:11 <gewt> i am digital (equipment corp) catgirl

21:11 <gewt> may or may not be part PDP-10

21:13 <tunixman> C is like Air, and C is based on PDP-10 asm, so since you breathe air you're part PDP-10.

21:14 <qu1j0t3> tunixman: you mean PDP-11.

21:14 <qu1j0t3> tunixman: whatever 'based on' means ;-)

21:14 <tunixman> oh yeah, sorry, that's right.

21:14 <tunixman> yeah hahah

21:14 <qu1j0t3> METAL

22:00 <Nerionaya> cr1901: yes that is the same game

22:00 <cr1901> It happens :D

22:34 <endrift> how did ## turn into ~h~ in the log name

22:35 <cr1901> Because "#" is used for the exact (range of) message(s) you want to link to