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Re: [Discuss-gnuradio] Parameters of NBFM block in GNU Radio companion


From: Mike Jameson
Subject: Re: [Discuss-gnuradio] Parameters of NBFM block in GNU Radio companion
Date: Tue, 29 Apr 2014 09:59:49 +0100

The 'NBFM receive' block's 'audio rate' must be stated as it is the value for the output sample rate of the block.  Yes, this can be the same as 'quadrature rate', which is the value for the input sample rate of the block, or what sample rate it expects to receive, however the 'audio rate' must be the result of dividing 'quadrature rate' by an integer (also known as audio decimation in the next paragraph), in the latter case this would be '96000/1=96000.

Note that when using the 'NBFM receive' block for example, if the 'quadrature rate' was '96000' and the 'audio rate' was '48000' then the 'AM demod' block would have the equivalent values of 'channel rate' = '96000' and 'audio decimation' of 2. 

Mike

--
Mike Jameson M0MIK BSc MIET
Email: address@hidden
Web: http://scanoo.com


On Tue, Apr 29, 2014 at 5:55 AM, ali hanif <address@hidden> wrote:
That means if i am not using sound card then there is no need to mention audio rate??and quadrature rate will be equal to sample rate?


On Mon, Apr 28, 2014 at 9:16 PM, Mike Jameson <address@hidden> wrote:
'Quadrature Rate' is the rate that samples come into the block.

'Audio Rate' is the rate that samples are sent to your sound card.

'Tau' is described in the following link:

http://gnuradio.4.n7.nabble.com/preemph-time-constant-td26659.html

Mike

--
Mike Jameson M0MIK BSc MIET
Email: address@hidden
Web: http://scanoo.com


On Mon, Apr 28, 2014 at 10:10 AM, ali hanif <address@hidden> wrote:
Can anybody explain to me the following parameters of NBFM block in GRC:   
Audio rate
Quadrature rate
Tau
          

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