Rob Col (@Robmar)
Hi Detlef, it just clicked that the image using the filter coefficients you produced is correct, the attenuation shows as around -40dB on the screenshot I posted,...
Time I'm short on, hence looking for a helping hand, or a filter design tool like Iowa Hills. Maybe someone has a copy?...
Hey, I use a nanoVNA for testing, great little devices! :DAs shown in the image I posted, your filter produces a hump across the 24KHz bandwidth, and there are signals...
Yes, input is IQ signals, can be from audio, from a quadrature mixer, usually radio and voice.Sample rate is 192 KHz, but Nyquist limit apart, the spectrum produced...
It's a spectrum display with waterfall, the spectrum is shown at top as the magnitude of the signals across the bandwidth.This is a very common application using...
Hi Ketlef, here we see using your coeffs with the 96 KHz scope view, we can see the cutoff is spot on from 270 to 294 KHz, so that's 24 KHz!Using the old 24 KHz...
Wow, thanks Detlef, that looks good I will try those values and let you know how they work.As I've upped the sample rate to 192KHz, the code handles 96 and 192 KHz...
Hi, thanks for that, looks interesting, though I'm not that familiar with Python. How long would it take you to do, guessing you know Python well
Thanks very much, but I'm really hoping for something like Iowa Hills filter designer, which unfortunately has disappeared.
My FFT code uses CMSIS DSP function arm_biquad_cascade_df1_f32() with coefficients set up for 12kHz, sample rate 48k, 60dB stopband, elliptic.I know the original...
8 years later, this high-pass filter method works well, if I drop alpha to 0.4 the hump disappears as the rest of the freq bin magnitudes increase to the same level....
I haven't got my head around the varied use of noise injection yet. Was reading on that in the technique to increases ADC resolution if there was enough noise...
Use this form to contact Robmar
Before you can contact a member of the *Related Sites:
- You must be logged in (register here)
- You must confirm you email address
