Hi Joaquim, On 11 Apr 2008 at 16:07, jdcx64 wrote: > I took you for an overzealous moderator. My mistake, there are no such > people on this forum. I might be a bit overprotective, but this isn't my only yahoogroup I run so starting plenty of discussions about spamming would be rather work intensive... > Of course it must be 'Phase Distortion' synthesis, I'm just wondering why > on earth the marketing people at Casio came up with such an expression. Distortion Synthesis is a pretty common expression, even so it's recently rather used for waveform generation within Virtual Analog Synths... check: http://www- ccrma.stanford.edu/~stilti/papers/TimStilsonPhDThesis2006.pdf > PD synthesis is done by fetching waveform values from a sin look-up > table at a non-constant rate. An accurate name for it would have been > 'sin-table-fetch-rate-modulation' or 'rate-modulation' for a short. Also known as waveshaping, what is a rather squishy expression for plenty of nonlinear stuff including distortion... > It happens that a sin look-up table is just a software optimization > technique for the sin function, widely used when CPUs can not > calculate it themselves. But the imperfection of such a table is partly responsible for the character of those synths... > My conclusion is that 'Phase Distortion' synthesis is more accurately > described by the words 'Frequency Modulation', a modulation of the sin > signal so deep as to halt it for a while and where the modulator is > complex and contains higher frequencies than the carrier itself, but it > still is frequency modulation. But frequency modulation reacts on the DC-Offset of the input function/fetching waveform, so isn't it better to use phase modulation like Yamaha did? > At the time the CZ line was launched another Japanese company was > already using the words 'Frequency Modulation' to describe a > completely different (and less clever) approach to sound synthesis and > Casio probably had to come up with some different wording. Well, the difference is, that Casio CZ Synths work mainly with waveshaping, I'm not exactly sure about the VZ Series, while first and 2nd generation of Yamaha FM-Synths weren't able to do true waveshaping since they aren't able to tune down Oscillators to 0Hz, like 3rd and 4the Generation (TG/SY77&99 and FS1R) are able to do... Still what I still miss is a modern FM-Synth with an assignable Ringmodulator, except my Clavia G2... > I read a vague statement on the web saying that Yamaha still managed > to sue Casio for patent infringement, does anyone have any details on > this? If this is true it should be a clear case against patent law > (abuse). I think it was because of the VZ Series, since it's alot closer to the Yamaha Synths. I've been told that Casio stopped their professional series since the VZ and FZ Generation haven't sold as well as expected. Best regards! ...Summa -- CZ/VZ mailing list : http://groups.yahoo.com/group/CZsynth FMHeaven mailing list : http://groups.yahoo.com/group/fmheaven/ FS1R mailing list : http://www.ampfea.org/mailman/listinfo/fss-list Vokator mailing list : http://groups.yahoo.com/group/vokator http://www.summasounds.de/
Message
Re: [CZsynth] Re: CZ-Synthesis
2008-04-12 by Summa