Re: [Discuss-gnuradio] RSSI (was: Re: Math library) &&question about "File Sink"

[????]

Hi Marcus,
Thank you very much!
You give me a simple way to calculate "sqrt".
Before I received your mail,
I had to use the "Complex to float" and "Multiply" to achive the same function.

When I use "File Sink" to get the "binary stream" with data type "float", I have to use my own C program 
covert the data type from "binary stream" to "ASCII".

Is there any similar block in GRC to achive File data type convert?

------------------ Original ------------------

From:  "Marcus M??lle";<address@hidden>;

Date:  Wed, Mar 19, 2014 07:20 PM

To:  "discuss-gnuradio"<address@hidden>;

Subject:  Re: [Discuss-gnuradio] RSSI (was: Re: Math library)

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Hi Owenzhang,

welcome to the mailing list!

GRC is a tool to construct flow graphs of GNU Radio blocks; there is
no "math library" in GRC, but there are blocks that perform
mathematical operations. Since you are probably looking for
sqrt(|x| ), try using the "Complex to Mag" Block.

As a side node, since this topic appears about every two months on
this mailing list: RSSI doesn't "specify" anything particular. You
will have to have a model for your signal to explain what a received
signal strength is -- this is something totally different for
different transmission methods. Therefore, there can never be a single
system to extract RSSI!

Greetings,
Marcus

On 19.03.2014 10:14, ?? wrote:
>
> Hi, This is the first time I send email to GNURadio Mailing List.
> Very glad to exchange ideas to all members.
>
> Recently, I want to extract RSSI from USRP N210. Is there any
> system to extract RSSI,or I have to build system by myself?
>
> In GRC, is there any library that has math module to calculate
> square and square root?
>
>
> best, wishes
>
> owenzhang
>
>
>
>
>
>
>
>
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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