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TMS320C5505: Q.15 format representation

RAMPRASAD CHIDAMBARAN
Prodigy 80 points
Part Number: TMS320C5505


Hi,

I am new to TMS320C5505 and am trying to understand Q format.

The dsp uses q.15 format to operate. I am trying to implement Filters.

I would like to know how to represent the values which are greater than 1 in q.15 format.

I understand the values in range -1 to 1 can be represented by q.15 format.

But what if my input contains dats both >1 and <1. How do I represent. 

I am working on a audio based app, and my input value might go beyond.

How do I handle these in ezDSPVC5505 USB STICK

Regards

Ramprasad

  • 0
    TI__Guru 65405 points
    Hi Ramprasad,

    I've forwarded your query to the c55x software experts. Their feedback should be posted here.

    BR
    Tsvetolin Shulev
  • 0
    Expert 2840 points
    Hi Ramprasad,

    You should put some bounds on you expected input values. Most inputs signals will have absolute maximum values so you could always scale them so that your peak input is 0,9999999999 etc. Then you can safely assume your Q.15 format is representative of your input values. Check out the absolute max input range of your A/D converter and take that as a maximum input to scale to.
    Hope this helps.
    MM