EDN recently published an article on using an external input buffer to
extend the low range response of sounds cards:
“Input buffer and attenuator for sound card oscilloscopes extends low-end
frequency response”. Stephen Woodward.
Copy that. Would a preamble with better properties like a gold code allow
to raise that threshold? I guess I need to dig into what that threshold
means. On the examples I’ve seen it’s always 0.9 or higher.
On Monday, June 29, 2020, Andy Walls wrote:
> On Sun, 2020-06-28 at 16:31 -0500, A
:42 -0500, Alex Roberts wrote:
> > Andy,
> >
> > I’m not sure how integrate the correlation sync block with gmsk.
>
> The correlate_and_sync block is an old block that was specific to RRC
> filtered PSK. You must mean the corr_est block.
>
> > It expects modul
Andy,
I’m not sure how integrate the correlation sync block with gmsk. It expects
modulated symbols and I’m not sure how to generate a modulated vector of
gmsk symbols. There doesn’t seem to be a gmsk class that can be used by
the modulate vector block.
Thanks,
Alex
On Thursday, June 25, 2020,
Think I finally found the answer to my problem in this old thread:
https://lists.gnu.org/archive/html/discuss-gnuradio/2015-07/msg00618.html
On Fri, May 29, 2020 at 12:18 PM Alex Roberts wrote:
> Any one have thoughts on this? Haven't been able to to get it working yet.
>
> On Thu, May
I have a need for a very low speed < 20 bits/second transmitter and
receiver pair. I've worked something based off the packet tx and packet rx
examples, added in a modified DVB - Reed solomon instance that operates on
nibbles at a time instead of bytes, and got it mostly working. My main
@JM, I'm curious to here about future results with rpmsg and pre-processing
on the M4. I've a GNURadio setup on a TI AM5728 (Cortex A15) processor that
has dual core M4's and dual C6x DSPs. Haven't had any free time lately, but
have been interested in how the M4s and DSPs could accelerate some of
Any one have thoughts on this? Haven't been able to to get it working yet.
On Thu, May 21, 2020 at 4:56 PM Alex Roberts wrote:
> I’m trying to define my own customer header format object by inheriting
> from header_format_base but when i try to use it I get the following errors
>
I’m trying to define my own customer header format object by inheriting
from header_format_base but when i try to use it I get the following errors
depending:
If just instantiating without namespace
value “header_format_custom” can not be evaluated: name
“header_format_custom” is not defined.
if
Quenten, Have you looked at any of the gr-dtv examples? Instead of pulling
into GRC with UDP, you could pull the video stream and convert to mpeg-TS
with either gstreamer or ffmpeg and stream it to a fifo file. The gr-dtv
examples are great for reading in TS files and broadcasting. I've done this
Hello Mailing List,
Happy New Year!
I've been playing around with this (
http://aaronscher.com/GNU_Radio_Companion_Collection/Audio_Modem_loop_back_test_FSK.html)
FSK audio modem and have a few issues/questions.
1) Is the PFB block the way to go for FSK timing recovery? I have issues
where if I
I'm playing around with an OFDM transmit/receive chain. I've noticed that
if I get underruns at a high enough rate, it becomes a bursty system and
the receiver is unable to lock in and no longer demodulates the symbols.
Would it be possible to generate continuous pilot tones or send OFDM frames
acked" into
>> > > integers, and amounts of bits, I always recommend people explicitly
>> use
>> > > "unsigned int", or directly go for an explicitly sized integer type,
>> > > e.g. "uint64_t gfpoly" for their polynomial representations
use
> "unsigned int", or directly go for an explicitly sized integer type,
> e.g. "uint64_t gfpoly" for their polynomial representations, so that
> there's no arithmetic surprises – signed integer overflow, for example,
> is way less well-defined than unsigned.
>
>
, d_blocks(blocks)
{
...
}
On Tue, Jul 23, 2019 at 3:44 PM Alex Roberts wrote:
> Marcus,
>
> I think what you said makes sense. I was initially thinking I would have a
> synchronous block with a message port output, but if I can keep it as
> simple as a sync block with two outputs
data is "synchronous" to the other data.
>
> Best regards,
> Marcus
>
> On Tue, 2019-07-23 at 09:10 -0500, Alex Roberts wrote:
> > I'd like to monitor an internal variable on a DSP block. have not made a
> custom block before but have read through some tutorial
I'd like to monitor an internal variable on a DSP block. have not made a
custom block before but have read through some tutorials.
Since the DSP inputs and outputs are vectors, and the variable is a single
item whose value is dependent on the processing of the vector, the number
of outputs does
t; Have you tried any of the examples in gr-fec/examples? If so and they
> didn't work for you, what issues have you encountered?
>
> Cheers,
> Ben
>
> On Sat, May 4, 2019 at 9:20 PM Alex Roberts wrote:
>
>> Hello GNURadio Users,
>>
>> I'm learning about
Hello GNURadio Users,
I'm learning about convolutional encoders in school and would like to
demonstrate their use in gnuradio for a presentation. The examples
appear useful for showing BER and Encoding -> decodng, but I'm
struggling to implement a signal chain
tx_bytes --> unpacked to packed ->
Hello GNURadio Users,
Is it possible to specify the frequency spacing of the carriers in the OFDM
Transmitter Block or Carrier Allocator block? My assumption is the carrier
spacing is calculated from the sampling rate and the FFT length (e.g, if
sampling rate is 640k and fft length is 64, is the
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