Support Forums Forums FIR Designer Support Invalid IR when grab measurement through API without compensate delay in Smaart Reply To: Invalid IR when grab measurement through API without compensate delay in Smaart

17 May 2022 at 5:55 pm #475

Hi Johnson,

The SMAART API grabs the transfer function as complex frequency domain values, with the frequency resolution determined by the current SMAART FFT size. SUT delay causes high phase slope in the transfer function. Further time averaging and frequency smoothing cause the delay to be blurred such that when the TF is converted back to an impulse response, the peak may not be distinct. The only alternative is to grab the impulse response through the SMAART API, and not the TF frequency values. I don’t think the API currently supports this – I’ll check with Rational – so in the meantime you’ll just have to remove SUT delay in SMAART.

Best regards,
EA Support

  • This reply was modified 4 months, 2 weeks ago by EA Support.