Re: [Discuss-gnuradio] difference b/w sample rate and symbols per second

[Marcus Müller]

We might be talking about different blocks.
I'm referring to gr::analog::frequency_modulator_fc, where the
documentation only says[1]

radians/sample = amplitude * sensitivity

>From what you paste as formulas this does not look like the general
frequency modulation, but like a digital modulation scheme, e.g. GMSK.

Anyway, we will not be able to tell you what you'll need to use as
parameters for your transmitter -- that is something that you, based on
your communication engineering skills, will need to decide yourself.

Sincerely,
Marcus Müller

[1]http://gnuradio.org/doc/doxygen/classgr_1_1analog_1_1frequency__modulator__fc.html#a9c252eeb8c9daf6ccd50427d3bc55bd3

On 05.07.2014 09:59, jason sam wrote:
> Sorry for prolonging the discussion but I am a bit confused here.The
> sensitivity parameter for Freq Mod block is defined as:
>
> sensitivity = (pi * modulation_index) / samples_per_symbol
> where,
>
> modulation_index = deviation / (baud_rate / 2)
>
> So what values should i plug in for samples_per_symbol and baud_rate
> in the formulas?
>
>
> On Fri, Jul 4, 2014 at 9:14 PM, Marcus Müller <address@hidden> wrote:
>> Not at all, because for these blocks, symbols have no meaning.
>>
>> On 04.07.2014 17:38, jason sam wrote:
>>> Yes Marcus,u are r right and i am also asking about such blocks like
>>> the FM Mod block..In this block u have an option to set sample rate
>>> but how can u set samples per symbol??
>>>
>>> On Fri, Jul 4, 2014 at 6:08 PM, Marcus Müller <address@hidden> wrote:
>>>> Hi Ali,
>>>> as said several times: Sampling rate, samples per symbol etc are
>>>> concepts that are meaningful only for certain blocks, and thus there is
>>>> no sense in setting those globally.
>>>>
>>>> Greetings,
>>>> Marcus
>>>> On 04.07.2014 08:33, jason sam wrote:
>>>>> Thanx Martin,but where in GRC we can set samples per symbol??I am new
>>>>> to this so i don't know yet...
>>>>>
>>>>> Ali
>>>>>
>>>>> On Tue, Jul 1, 2014 at 2:18 PM, Martin Braun <address@hidden> wrote:
>>>>>> On 06/26/2014 11:06 AM, jason sam wrote:
>>>>>>> I am bit confused b/w the two terms.I have read some material and i
>>>>>>> got the following relationship b/w the two:
>>>>>>> samples/second =samples/symbol * symbols/second
>>>>>>> And i think in GRC samples per symbol is 1(plz correct if i am
>>>>>>> wrong).So sample rate becomes equal to baud rate(symbols/second)??
>>>>>> samples per symbol is whatever you set it to; common values are 2 and 4
>>>>>> (this also depends on the modulation used). Higher values are often used
>>>>>> for demo purposes.
>>>>>>
>>>>>> M
>>>>>>
>>>>>>
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