Re: [Discuss-gnuradio] 3.16k constant in simple_fm_rcv

[Marcus D. Leech]

> This is a question primarily for Marcus D. Leech (aka patchvonbraun):
>
> In your simple_fm_rcv project, you have a "Multiply Const" block that 
> contains the constant 3.16k whenever stereo is enabled. I presume this 
> is used to amplify the level of the "L - R" signal to reach the ideal 
> level of separation between the channels. How did you arrive at that 
> constant, i.e. what is it based on? I haven't been able to find any 
> official spec that explains how much the L-R signal should be 
> amplified. Thanks in advance.
>
> Ethan
I think part of the reason for that (hey, I wrote this thing last summer 
:) ) is that you end up having to multiply a bunch of signals together 
that are
  individually something like -10dB down, so you have to make up for 
that somewhere.

The thing really did start out simple.  Then I added stereo, and tried 
to improve the sound quality, and then....




--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org