Hello, I just received my EZ-Kit 21364 evaluation board. I've runned some examples provided with VDSP 4.0, and I looked to the source code, etc. I'm also currently reading the hardware reference of the 21364 processor. I want to write a simple LPF/HPF to get my hands on with the processor and board, but I have a few questions : - I tried the basic analog audio talktrough C example (which just copy the input of the ADC to the DAC), but the 3 buffers are unsigned int, so I got ugly clicks and distortion when trying to code the simpliest LP filter. I'd like to set the data format to 32-bit float, anyone could give me a reference or tips ? I think I need to setup correctly the MODE1 register. - Does anyone has good resources for audio filtering examples with 213xx ? Many thanks, Regards, Matthieu.
New to EZ-Kit 213xx
Started by ●October 6, 2005
Reply by ●October 6, 20052005-10-06
Hi, Look in the installation subfolders, and see how is it managed with the other DSPs, in case that there is no example already for the '364. -- ------------------------------ Jaime Andr�s Aranguren Cardona jaac@sanjaac.com SanJaaC Electronics Soluciones en DSP www.sanjaac.com "Matthieu" <nospam@nospam.com> escribi� en el mensaje news:434523f2$0$12623$636a15ce@news.free.fr...> Hello, > > I just received my EZ-Kit 21364 evaluation board. > I've runned some examples provided with VDSP 4.0, and I looked to the > source code, etc. I'm also currently reading the hardware reference > of the 21364 processor. > I want to write a simple LPF/HPF to get my hands on with the processor and > board, but I have a few questions : > > - I tried the basic analog audio talktrough C example (which just copy the > input of the ADC to the DAC), but the 3 buffers are unsigned int, so I got > ugly clicks and distortion when trying to code the simpliest LP filter. > I'd like to set the data format to 32-bit float, anyone could give me a > reference or tips ? I think I need to setup correctly the MODE1 register. > > - Does anyone has good resources for audio filtering examples with 213xx ? > > Many thanks, > Regards, > > Matthieu.
Reply by ●October 11, 20052005-10-11
Matthieu <nospam@nospam.com> wrote in news:434523f2$0$12623$636a15ce@news.free.fr:> Hello, > > I just received my EZ-Kit 21364 evaluation board. > I've runned some examples provided with VDSP 4.0, and I looked to the > source code, etc. I'm also currently reading the hardware reference > of the 21364 processor. > I want to write a simple LPF/HPF to get my hands on with the processor > and board, but I have a few questions : > > - I tried the basic analog audio talktrough C example (which just copy > the input of the ADC to the DAC), but the 3 buffers are unsigned int, > so I got ugly clicks and distortion when trying to code the simpliest > LP filter. I'd like to set the data format to 32-bit float, anyone > could give me a reference or tips ? I think I need to setup correctly > the MODE1 register. > > - Does anyone has good resources for audio filtering examples with > 213xx ? > > Many thanks, > Regards, > > Matthieu.We manufacture Sharc based DSP boards. We have boards that include an EZ- KIt style debugger and look just klike an EZ-Kit to VDSP. To convert from fixed to float: r1 = -31; f4 = FLOAT r4 BY r1; To convert from fixed to float: r1 = 31; r0 = FIX f4 BY r1; (Or something similiar) This assumes 1.31 fixed format and that the float value is -1 to almost 1. -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com