DTFT or Goertzel in VHDL

[jpdullius]

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.