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Hi,
I am trying to calculate the amplitude of a sine-signal.
In grc the scope shows a instable value jumping between 0 and the real
amplitude.
My code is in the attachment.
regards
Georg
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/* -*- c++ -*- */
/*
* Copyright 2004 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
/*
* config.h is generated by configure. It contains the results
* of probing for features, options etc. It should be the first
* file included in your .cc file.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <isa_amp_vff.h>
#include <gr_io_signature.h>
#include <stdio.h>
/*
* Create a new instance of isa_amp_vff and return
* a boost shared_ptr. This is effectively the public constructor.
*/
isa_amp_vff_sptr
isa_make_amp_vff (int vlen)
{
return isa_amp_vff_sptr (new isa_amp_vff (vlen));
}
/*
* Specify constraints on number of input and output streams.
* This info is used to construct the input and output signatures
* (2nd & 3rd args to gr_block's constructor). The input and
* output signatures are used by the runtime system to
* check that a valid number and type of inputs and outputs
* are connected to this block. In this case, we accept
* only 1 input and 1 output.
*/
static const int MIN_IN = 1; // mininum number of input streams
static const int MAX_IN = 1; // maximum number of input streams
static const int MIN_OUT = 1; // minimum number of output streams
static const int MAX_OUT = 1; // maximum number of output streams
/*
* The private constructor
*/
isa_amp_vff::isa_amp_vff (int vlen)
: gr_block ("amp_vff",
gr_make_io_signature (MIN_IN, MAX_IN, sizeof (float)*vlen),
gr_make_io_signature (MIN_OUT, MAX_OUT, sizeof (float)))
{
// nothing else required in this example
d_amp_vlen=vlen;
}
/*
* Our virtual destructor.
*/
isa_amp_vff::~isa_amp_vff ()
{
// nothing else required in this example
}
int isa_amp_vff::general_work (
int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items){
const float *in = (const float *) input_items[0];
float *out = (float *) output_items[0];
double h_amp=0, l_amp=0;
for (int i = 1; i < d_amp_vlen; i++){
if ( in[i] > h_amp ){
h_amp=in[i];
}else if ( in[i] < l_amp ){
l_amp=in[i];
}
}
out[0]=h_amp+(l_amp*(-1));
// Tell runtime system how many input items we consumed on
// each input stream.
consume_each (noutput_items);
// Tell runtime system how many output items we produced.
return noutput_items;
}
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