I am confused about exactly what goes on inside the Hilbert Block. I have read the description on the Wiki which is very brief and I also read Tom Rondeau’s blog which provided far more insight.
I understand that the block is essentially an FIR high pass filter with the passband starting at 0. Thus it would be removing the negative frequency of the imaginary part of the signal as well as shifting the signal by 90 degrees. How does it operate to remove the negative frequency of the real part of the signal as well since this part of the signal is not shifted? I also observed, by using the Frequency Sink that the Hilbert output performs a 70 dB reduction of the negative signal using 125 taps. However, when I connect a Complex to Float block to its output and observe the frequencies, the negative frequency reduction is no longer present. I guess I also don’t completely understand the functionality of that block well either. Thanks for any insight you can provide. Jim -- This email has been checked for viruses by AVG antivirus software. www.avg.com
