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TMDSLCDK6748: Doubts in programming

Abhishek Dutta
Expert 1575 points

Part Number: TMDSLCDK6748

Hello all,

1)In Single-precision IIR filter (used in the VSELP vocoder) code present ,

for (i = 0; i < nr; i++)

sum = h2[0] * x[4+i]; why h2[0] is taken instead of h2[i] and i is added with 4?

2)

r1[nr+4] Delay element values (i/p and o/p)

x[nr + 4] Pointer to the input array.

why 4 is added with nr?

3)Can anyone provide me pdf for IIR performing ARMA filter?

I HAVE ATTACHED THE PDF.please check page no. 79 of the pdf.  

dsplib6748.pdf

  • 0
    TI__Guru**** 161600 points
    Hi,

    Are you using Processor SDK RTOS? Which version?

    Best Regards,
    Yordan
  • 0
    TI__Guru** 116830 points
    Abhishek,

    The version of DSPLIB that you are referring to is over 15 years old and applies to C67x DSP. The C6748 DSP is C674x+ architecture which has its own DSPLIB which is the one you should be using. The IIR implementation is several years old so it may be a little difficult to track the history of this implementation.

    It is unclear what clarification you need. You are asking for a PDF document for IIR documentation and then attached the DSPLIB pdf yourself that has the DSPLIB API description. Can you please clarify ?

    Regards,
    Rahul

    PS: Please check if this has the required information :
    e2e.ti.com/.../365446