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From: | Activecat |
Subject: | Re: [Discuss-gnuradio] Frequency modulation in GRC |
Date: | Mon, 26 May 2014 10:31:01 +0800 |
On 25.05.2014 20:01, jason sam wrote:> But if it is doing FM then there should be some min and max
> frequencies between which the signal will be switching?If you refer to the source code of the frequency_modulator_fc_impl.cc, then the min and max frequencies could be calculated.
Says, your sampling rate is samp_rateAssuming the lowest input value to the FM block is zero, then
minimum frequency of the FM output = samp_rate * sensitivity / ( 2 * PI )Assuming the highest input value to the FM block is Vmax, thenmaximum frequency of the FM output = samp_rate * ( sensitivity + Vmax ) / ( 2 * PI)
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