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| From: | Marcus Müller |
| Subject: | Re: Creating a wave in OOT modules |
| Date: | Sun, 10 Mar 2024 15:52:10 +0100 |
| User-agent: | Mozilla Thunderbird |
Hi Sourya, multiple things:1. You return 1 in work. That literally tells GNU Radio that you only produced a single sample! I think we explain what work does in our tutorials on https://tutorials.gnuradio.org , so you might want to go back and read them a bit more carefully!
2. you assume you have self.duration * self.sample_rate in space in the output buffer. That is wrong. You get as much space in the output buffer as you get; you need to check len(output_items[0]) !
3. you assume the phase at the beginning of your work function is always 0; that is probably a result of the previous mistake. That's not the case! You need to save your last sample's phase for the next time "work" is called
4. You assign the output "output_items[0] = s", but that's wrong (and not like our examples at all): you need to do output_items[0][:] = s, because you need to replace the values, not just the reference to the vector. You need to solve 1.–3. first though!
Best regards, Marcus On 09.03.24 16:14, Sourya Saha wrote:
Hi.
I am trying to create a custom wave through an OOT module. To do that, I
tried replicating the sine wave of the signal source block. I have used the
following Python code:
import numpy as np
from gnuradio import gr
class sine(gr.sync_block):
"""
docstring for block sine
"""
def __init__(self, sample_rate, duration=1000, freq=0):
gr.sync_block.__init__(self,
name="sine",
in_sig=None,
out_sig=[np.float32, ])
self.sample_rate = sample_rate
self.duration = duration
self.freq = 0
def work(self, input_items, output_items):
#out = output_items[0]
t = np.arange(0, self.duration, 1/self.sample_rate)
s = np.sin(2*np.pi*self.freq*t)
# <+signal processing here+>
output_items[0] = s
return 1 #len(output_items[0])
However, I do not get any output from the output line. Could you suggest
what could have gone wrong?
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