"t" is the representation in continuous-time but in discrete time it can be represented in the form of sample-count (samp-rate must be known).
nitems_written<http://gnuradio.org/doc/doxygen/classgr_1_1block.html#a742128a481fcb9e43a3e0cd535a57f9e> hold the number of items produced by the block on the output port. This count along-with "noutput_items" (items that can be produced during current work function call), can possibly be used to determine the factor "t" -Adeel On Mon, Feb 10, 2014 at 5:17 AM, Activecat <active...@gmail.com> wrote: > Dear Sir, > > I am building a custom block. > How to know the time t, in seconds, of how long the flow graph has started? > > Says, I build a block of analog_sig_source_f. > Its work() function may involve a variable t (time) as below: > > for ( int i=0; i < noutput_items; i++ ) { > out[i] = ampl * sin( 2 * PI * wave_freq * t ) > } > > I know we there is a built-in Signal Source block, but I write this to > illustrate what I need to do. > > Regards, > activecat > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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