Re: [Discuss-gnuradio] Continuously Write FFT Samples to a File

[Mallesham Dasari]

Hi Marcus,

Raw IQ samples take lots of memory because each sample will be around 8Bytes. Suppose, if we 1Msps sample rate, just for 10 minutes of data, we get 10*60*1M*8B = 4.8GB data. On the other hand, if you store just FFT with 1024 bin, we get 4.8GB/1024 power values right (which has very less size)? 

Please correct me if I am wrong.

Thanks

On Wed, Jan 11, 2017 at 7:32 AM, Marcus Müller <address@hidden> wrote:

Hi Mallesham,

I don't understand – the raw IQ samples and their FFT have the same size, and data type.

Maybe you've understood something that I (and Martin) didn't – could you elaborate?

Best regards,
Marcus

On 01/11/2017 12:56 AM, Mallesham Dasari wrote:

Hi Hasini,

If you are trying to print just the FFT, it should not be an issue. If you print raw iq samples, then you will run out of memory. By long, you mean how long? Days?

On Tue, Jan 10, 2017 at 3:16 PM, Martin Braun <address@hidden> wrote:

Hasini,

can you please re-state what you're trying to do? That might help you
getting some answers. It is not quite clear from this email.

Cheers,
Martin

On 01/02/2017 09:16 PM, Hasini Abeywickrama wrote:
> Hi all,
>
> I have a flowgraph that reads a signal and writes its FFT samples to a
> file. I need to run this continuously (for a long time), without running
> out of memory.
>
> I tired deleting the earlier FFT samples from the file but that messes
> up with reading the data. I also tried starting writing to a different
> file after some time so the initial file can be completely deleted. But
> it did not work as well.
>
> What would be the best approach for this? Any thought would be very much
> appreciated.
>
> Regards,
> Hasini
>
>
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> Discuss-gnuradio mailing list
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Best Regards,

Mallesham Dasari

Department of Computer Science

Stony Brook University

USA - 11794

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Best Regards,

Mallesham Dasari

Department of Computer Science

Stony Brook University

USA - 11794