ADAU1787 - Import/generate custom FIR filter coefficients

Hello David. Thank you for your reply. I'm ready to dive in now.

Don

Hello Don,

I searched the forum to find some posts about using a Hilbert transform. 

(+) ADAU1446 Hilbert transform response - Q&A - SigmaDSP Processors and SigmaStudio Development Tool - EngineerZone (analog.com)

Here is an older post from before we had added a Hilbert Transform on the ADAU1452. So this post shows how to do it using an FIR filter. instead of the IIR implementation. However, the DSP you are using is very limited on MIPS. 

(+) Hilbert transform for ADAU1452 - Q&A - SigmaDSP Processors and SigmaStudio Development Tool - EngineerZone (analog.com)

We can use more details to help you further. 

Dave T

Hi Dave, thanks for your follow-up.  The Hilbert will work. Now to zero in on what device best fits.  My criteria: cost and availability.

I initially picked the ADAU1787 due to it high sampling rate (768k).   However, min 384 k is fine.

To better define the application: This will be a baseband audio simplex (either in receiver or transmit) processor: 

Receive: An input signal from the RF receiver is baseband- sampled, an FFT performed by the DUT with FFT data (bin magnitude) moved over a serial port to a micro-controller-TFT display. Simultaneously, a signal of interest (3.6 kHz max bw) inside that spectrum will be processed through the Hilbert to obtain I and Q -( 90 deg quadrature). I and Q are then combined (either added or subtracted) to obtain audio.

Transit (receive disabled): microphone or line mono-audio-input is Hilbert transformed with the 2 channels used to drive an external I-Q modulator.

Please advise candidate ADAUxxx devices.

Thanks again, Don

Hi Dave, thanks for your follow-up.  The Hilbert will work. Now to zero in on what device best fits.  My criteria: cost and availability.

I initially picked the ADAU1787 due to it high sampling rate (768k).   However, min 384 k is fine.

To better define the application: This will be a baseband audio simplex (either in receiver or transmit) processor: 

Receive: An input signal from the RF receiver is baseband- sampled, an FFT performed by the DUT with FFT data (bin magnitude) moved over a serial port to a micro-controller-TFT display. Simultaneously, a signal of interest (3.6 kHz max bw) inside that spectrum will be processed through the Hilbert to obtain I and Q -( 90 deg quadrature). I and Q are then combined (either added or subtracted) to obtain audio.

Transit (receive disabled): microphone or line mono-audio-input is Hilbert transformed with the 2 channels used to drive an external I-Q modulator.

Please advise candidate ADAUxxx devices.

Thanks again, Don