From 46691013b21057957eb50ce8ca2fcd0f3fea906a Mon Sep 17 00:00:00 2001 From: Chris Xiong Date: Sat, 2 Jul 2022 01:42:53 +0800 Subject: my english bad. --- blog/post/2020-11-20.html | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/blog/post/2020-11-20.html b/blog/post/2020-11-20.html index 4769a2e..faa4729 100644 --- a/blog/post/2020-11-20.html +++ b/blog/post/2020-11-20.html @@ -1551,7 +1551,7 @@ Stereo Auto Wah
-
[1]: Judging by the way Roland utilized the SH-3 CPU in MC-909, which has a 16MHz external clock input and a 8x multiplier (128MHz internal clock), I would guess the CPU in SD-80 also works at 8x multiplier and therefore 96MHz internally.
[2]: Later the source of this DC bias is determined to be SD-80 itself, not the recording device. See the next section.
[3]: オールインワン・モデルSD-90でご好評いただいた、新開発MIDI音源部を搭載したマルチティンバー音源が登場。 As seen here. I don’t actually know any Japanese and just pieced stuff together randomly. Sorry if I butchered your language.
[4]: Munt isn’t strictly an emulation. It doesn’t emulate the CPU or actual circuitry of the MT-32. See below.
[5]: without Roland losing their mind and releasing all internal documentation on the XV engine, or some absolute madlad spending 15 hours everyday on reverse engineering the thing for half a year, that is.
[6]: SD-80 has 32MiB of compressed wave ROM, see the “list of integrated circuit chips on SD-80 main board” in the first section. Roland’s waveform compression scheme usually results in a ~50% compression ratio. Therefore the content is roughly equal to 64 MiB of uncompressed 16-bit PCM wave.
[7]: The “23C128” kind of gave it away – they are the μPD23C128040ALGY mask ROM chips from NEC, which is the exact same type of ROM used in XV-5080. Unlike the XV-5080 though, the SD-80 makes use of both its J variant and K variant, while the XV-5080 only uses the J variant (these variants have symmetric pin configuration).
[8]: Well, the Raspberry Pi isn’t really suitable for this task because it doesn’t have enough GPIO pins. But there’s an easy workaround for that.
[9]: For readers who wonders what “mask” means in this context: you can treat a mask ROM as a huge array of tiny switches that can’t be turned on or off once manufactured. You can access the state of a group of switches by giving an address to its input pins. The mask is used as a template of the states of these switches during the manufacture process. This is electrical engineering amateur Chris trying to explain mask ROM in layman’s terms.
[10]: HyperCanvas (HQ-GM2) or Cakewalk TTS-1, which is a rebranding of the former; SuperQuartet (HQ-QT) and Orchestral (HQ-OR). A plugin called GrooveSynth (P5antom) bundled with several earlier Cakewalk products providing patches from the MC-303 Groovebox also uses this engine.
[11]: which is kind of weird considering Spectrasonics basically spun off from Roland
[12]: Also used in XP-80, see the errata section of its service manual.
[13]: HD64F7017F28, SH7017 in parts list
[14]: 40 of the 90 types will take up all three slots, most likely due to the reduced DSP power.
[15]: Support for multisamples also exist in Fantom S/S88, so this is more likely due to an updated system software rather than changes of the synth engine.
[16]: There are evidence that some of them are handled by software (SD-80 having one more LFO per part than the XV-5080). However it can also be using LFO blocks in the XV chip that is unused in the XV-5080.
[17]: This mapping is used for DT1/RQ1 system exclusive messages.
[18]: The first half is also true for earlier SC models (SC-55 <-> JV-880, SC-88 <-> JV-1080, SC-88Pro <-> JV-2080, SC-8850 <-> XV-3080). However the second half isn’t. Earlier SC models employs a GS-specific address map which looks nothing like their counterparts.
[19]: And also the last time, since neither the SD-20 nor the SD-50 has such editability.
[20]: Apparently it’s from the SC-8850.
[21]: The multisample from Roland Cloud seem to have an extra sample in the highest register, which sounds like it’s processed with a low-pass filter with very low cut off frequency and makes it sound like garbage. This is also the case for the version included in the original SRX-09 boards.
[22]: The owner’s manual of the SD-80 contains blatant lies. It says “It is not possible for the edited sounds to be saved in the internal memory of the SD-80” (which is directly copied from SD-90’s manual), and goes on to teach you how to save a user patch.
[23]: For example, nearly all acoustic bass patches have a disabled tone with wave number 249 “TenBlwSaxVib” selected, and the Fiddle 2 vib patch have a disabled tone with wave number 276 “Blow Pipe” selected.
[24]: Wave #249 in XV-5080 is UprightBs 2A, and Wave #276 in SRX-09 is Fdl Pizz 1C (Fiddle Pizzicato).
+
[1]: Judging by the way Roland utilized the SH-3 CPU in MC-909, which has a 16MHz external clock input and a 8x multiplier (128MHz internal clock), I would guess the CPU in SD-80 also works at 8x multiplier and therefore 96MHz internally.
[2]: Later the source of this DC bias is determined to be SD-80 itself, not the recording device. See the next section.
[3]: オールインワン・モデルSD-90でご好評いただいた、新開発MIDI音源部を搭載したマルチティンバー音源が登場。 As seen here. I don’t actually know any Japanese and just pieced stuff together randomly. Sorry if I butchered your language.
[4]: Munt isn’t strictly an emulation. It doesn’t emulate the CPU or actual circuitry of the MT-32. See below.
[5]: without Roland losing their mind and releasing all internal documentation on the XV engine, or some absolute madlad spending 15 hours everyday on reverse engineering the thing for half a year, that is.
[6]: SD-80 has 32MiB of compressed wave ROM, see the “list of integrated circuit chips on SD-80 main board” in the first section. Roland’s waveform compression scheme usually results in a ~50% compression ratio. Therefore the content is roughly equal to 64 MiB of uncompressed 16-bit PCM wave.
[7]: The “23C128” kind of gave it away – they are the μPD23C128040ALGY mask ROM chips from NEC, which is the exact same type of ROM used in XV-5080. Unlike the XV-5080 though, the SD-80 makes use of both its J variant and K variant, while the XV-5080 only uses the J variant (these variants have symmetric pin configuration).
[8]: Well, the Raspberry Pi isn’t really suitable for this task because it doesn’t have enough GPIO pins. But there’s an easy workaround for that.
[9]: For readers who wonders what “mask” means in this context: you can treat a mask ROM as a huge array of tiny switches that can’t be turned on or off once manufactured. You can access the state of a group of switches by giving an address to its input pins. The mask is used as a template of the states of these switches during the manufacture process. This is electrical engineering amateur Chris trying to explain mask ROM in layman’s terms.
[10]: HyperCanvas (HQ-GM2) or Cakewalk TTS-1, which is a rebranding of the former; SuperQuartet (HQ-QT) and Orchestral (HQ-OR). A plugin called GrooveSynth (P5antom) bundled with several earlier Cakewalk products providing patches from the MC-303 Groovebox also uses this engine.
[11]: which is kind of weird considering Spectrasonics basically spun off from Roland
[12]: Also used in XP-80, see the errata section of its service manual.
[13]: HD64F7017F28, SH7017 in parts list
[14]: 40 of the 90 types will take up all three slots, most likely due to the reduced DSP power.
[15]: Support for multisamples also exist in Fantom S/S88, so this is more likely due to an updated system software rather than changes of the synth engine.
[16]: There is evidence that some of them are handled by software (SD-80 having one more LFO per part than the XV-5080). However it can also be using LFO blocks in the XV chip that is unused in the XV-5080.
[17]: This mapping is used for DT1/RQ1 system exclusive messages.
[18]: The first half is also true for earlier SC models (SC-55 <-> JV-880, SC-88 <-> JV-1080, SC-88Pro <-> JV-2080, SC-8850 <-> XV-3080). However the second half isn’t. Earlier SC models employs a GS-specific address map which looks nothing like their counterparts.
[19]: And also the last time, since neither the SD-20 nor the SD-50 has such editability.
[20]: Apparently it’s from the SC-8850.
[21]: The multisample from Roland Cloud seem to have an extra sample in the highest register, which sounds like it’s processed with a low-pass filter with very low cut off frequency and makes it sound like garbage. This is also the case for the version included in the original SRX-09 boards.
[22]: The owner’s manual of the SD-80 contains blatant lies. It says “It is not possible for the edited sounds to be saved in the internal memory of the SD-80” (which is directly copied from SD-90’s manual), and goes on to teach you how to save a user patch.
[23]: For example, nearly all acoustic bass patches have a disabled tone with wave number 249 “TenBlwSaxVib” selected, and the Fiddle 2 vib patch have a disabled tone with wave number 276 “Blow Pipe” selected.
[24]: Wave #249 in XV-5080 is UprightBs 2A, and Wave #276 in SRX-09 is Fdl Pizz 1C (Fiddle Pizzicato).