DTFT or Goertzel in VHDL

Hello ppl,

Does anyone have any resource on how to implement DTFT or Goertzel
functions in VHDL? (Xilinx ISE)
Trying to implement and DTMF tone decoder using data from a PCM
codec...

Regards,
JP Dullius

 

[jens]

The Goertzel algorithm is probably the way to go for decoding, and
there are many excellent on-line references that can be easily googled.
If you get stuck, comp.dsp would be helpful for the DSP side of
things.

A couple of tips:

1. k does not need to be an integer, as some references state or imply.

2. The numbers grow pretty quick... use either floating point or large
fixed-point numbers, and make sure they don't overflow.