On Mon, Oct 15, 2001 at 11:15:34PM +0200, Tomek Cedro wrote: > I've resigned to use linux box as a D-class amplifier. > I've diecided to make standalone device. > Why? The biggest problem is that serial/parallel port's max. output > frequency is 370kHz... It could be usefull, but I don't want to make my life > harder - as I often like to do ;)
Good decision, this is really best done in hardware. > I'm planning to use MAXIM's signal generator or motorola fast microcontroller, > maybe dallas 80Cxxx or atmel's AT90Sxxx. Try a 1MHz sawtooth generator and a comparator. You can't get any simpler. > Day by day I'm thinking about "great" Intel's microprocessors efficiency... > and I'm really considering switchng to MOTOROLA for good :) You don't understand. This has nothing to do with Intel CPU efficiency or Intel vs. Motorola, this is a fundamental problem. You just can't get a stable software generated high frequency signal from a system that uses a general purpose operating system. There are just too many tasks in the system that need the CPU as well. You either need a single tasking operating system, or a real-time operating system. Even if you have a single tasking OS or a real-time OS, it can still be hard to get a stable software generated high frequency signal if the system uses a PCI architecture with multiple devices. If one such device does a DMA burst over the bus, your CPU won't be able to use the bus and you'll get quite some jitter in the high frequency signal. > I don't want to piss off anyoune, but I think that those guys who tols me so > many bad things abut ->->>GNU<<-<- assembler, Please reread our messages. Nobody said a bad thing about the GNU assembler. > should read assembly-howto... I did. Sections 2 (Do you need assembly?) is very helpful. Reread it and you'll find all the arguments used over here. > I was not talking abut ->NASM<-. Never mind... peace! ATARI RULZ! :] > > Once again thanks for all help and sugestions! > I'll call You when device ready... Yes, please do. I'm pretty much interested if this class D amplifier will work. I've been thinking about doing such an amplifier myself, but never got so much as building one. Erik [who studied electrical engineering but got typical computer science jobs until now] -- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: [EMAIL PROTECTED] WWW: http://www-ict.its.tudelft.nl/~erik/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
