Re: Problem with Log Power FFT block

[Marcus Müller]

That's peculiar, but as a side note:

The logarithm is a strictly monotonous function.

Therefore, you can just omit the logarithm operation altogether; the
thing with the maximum logarithm is always the thing with the maximum
amplitude, anyway. If you still need the logarithm of that value, you
can do that *after* the maximum and calculate one logarithm per FFT,
instead of one logarithm for every single sample.

On 15.01.21 13:49, Wojciech Kazubski wrote:
> Hello,
> Some time ago I used  Log Power FFT block to detect a weak carrier in a 
> noise. 
> The output vector was passed through a Max block set to vector length  1024 
> to 
> determine the highest value, which was the signal power. This worked fine in 
> GR-3.7, but after upgrade to GR-3.8 (release 3.8.2) I get this error in Log 
> Power FFT block:
> 
> Failed to eval ''part' if vlen == 1 else 'none'': name 'vlen' is not defined
> 
> Is this a bug or I am doing something wrong?
> 
> --
> Wojciech Kazubski
> 
> 
>

smime.p7s
Description: S/MIME Cryptographic Signature