Wrong implementation of the quasi peak measurement

[drauthev]

Hi,

I took 2 screen dumps to demonstrate that the quasi peak measurement method does some sort of frequency domain smoothing as of the current implementation, which is clearly not what it should be doing. The 1st screenshot was made using the AVE16 calc method, the 2nd is QP.

The quasi peak smoothing must be done in the time domain, so each frequency bin of interest must be measured separately for a certain amount of time and the consequently taken samples need to be fed to a quasi peak detector with an attack and release time specified by CISPR.

The device is tinySA 4 Ultra, firmware v1.4-185.

Best regards,
Andras