[Elecraft] Meaning of EQ bands?

[Ian White GM3SEK]

Thank you for the clarification, Lyle.  I hadn't seen that information 
anywhere before.

The existing K3 manual seems quite misleading in talking about 8 "bands" 
of audio equalization. We now learn that the EQ facility allows the user 
to set the relative levels at 8 discrete frequency POINTS, and that the 
rest of the frequency response is interpolated by "joining up the dots".

That gives quite a different shape to the frequency response than many 
will have imagined.


>> How exactly are the EQ bands implemented in DSP, in terms of frequency
>> response?

>In the KX3, the gain of the FIR filter at the specified frequency is 
>set to the requested value, and a linear interpolation is performed 
>from the next lower specified frequency.  At the highest frequency, 
>sertting, all frequencies higher are set to the requested value.
>
>The K3 operates in a similar fashion.
>
>These are inputs to the FIR coefficient generator along with 
>center/width/lo cut/hi cut and manual notch to create the FIR filter.
>
>73,
>
>Lyle KK7P
>

-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek