IQ files are binary files with the raw stream and no headers. Depending on
sample resolution, these are complex pairs of either floats or bytes.
Conversion of bytes to floats is given by the code:
float f;
byte b;
f = (b - 127)/128;
HTH
Nikos
On Wed, Mar 16, 2016 at 4:04 PM, Henry Barton
This works! Thanks a lot!
Ralph.
>-Original Message-
>From: Marcus Müller [mailto:marcus.muel...@ettus.com]
>Sent: Wednesday, March 16, 2016 10:24
>To: Ralph A. Schmid, dk5ras; discuss-gnuradio@gnu.org
>Subject: Re: [Discuss-gnuradio] lack of understanding the different formats
to
This sounds interesting; I too have been wondering how IQ files worked. I
thought it must be alternating I bytes and Q bytes, or with >8-bit radios, I
words and Q words. But maybe the packed byte system is right, since I can feed
IQ recordings in WAV format directly into GNUradio without
Exactly that's the case; the "normal" complex type of GNU Radio is
really just 32bit floats
IQIQIQIQ...
ie. a single complex is nothing but two consecutive floating point numbers.
WAV files come in all types, encodings and storage quantizations.
Typically, the header/tail are much shorter than
Ok, let "I" and "Q" be single bits each, so each byte would then be
IQIQIQIQ
if I had to take a guess.
You can get get back something that GR commonly deals with by doing
packed to unpacked (type=B, bits per chunk = 1, endianness=your machine)
-> IChar to Complex
Best regards,
Marcus
On
OK, I will give this a try :) I hoped that there would be some overview,
explaining the different interconnect formats when connecting gnuradio blocks...
Tnx!
Ralph.
From: Jacob Gilbert [mailto:mrjacobagilb...@gmail.com]
Sent: Friday, March 11, 2016 3:50 PM
To: Ralph A. Schmid,
Each byte seems to contain 4 1 bit I/Q samples. This is the text from the
readme:
"The output file size can be reduced by using "-b 1" option to store four
1-bit I/Q samples into a single byte."
Ralph.
> -Original Message-
> From: discuss-gnuradio-bounces+ralph=schmid@gnu.org
>
Ralph,
If I understand this, each 8-bit byte of data contains four two-bit IQ
samples, in which case the "Unpack K Bits" block is likely what you are
looking for. It will treat each bit in a byte (from Byte File Source in
this case) as an individual item, which can then be type-converted and
In what format are your 1bit samples? I'd assume they are just the fact
whether a byte is 0x00 or 0x01; in that case, just use unpacked to packed.
On 03/11/2016 10:24 AM, Ralph A. Schmid, dk5ras wrote:
> Hi,
>
> Being an RF guy I must admit that I am somehow lost in the different ways
> how
