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IQ Data form usb is signed? #155

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wzyy2 opened this issue Jan 5, 2015 · 4 comments

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@wzyy2
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commented Jan 5, 2015

If I google "hackrf iq",I will be told that "The HackRF logs are IQ data pairs, stored as unsigned 8 bit integers "..............
even comment in gr-osmosdr say is unsigned.....

/* HackRF device produces 8 bit unsigned IQ data */
...........
    _lut.push_back( gr_complex( (float(char(i >> 8))) * (1.0f/128.0f),
                                (float(char(i & 0xff))) * (1.0f/128.0f) ) );
...........

Maybe It should be mentioned.

@mossmann

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commented Apr 8, 2015

The data are signed but were once (more than a year ago) unsigned.

@a232319779

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commented Jan 22, 2017

HI,mossmann,
which firmware version had been changed?
How about the version : 2014.08.01

@a232319779

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commented Jan 22, 2017

I should ask clearly:
it's signed at the firmware version 2014.08.01?

@dominicgs

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commented Jan 22, 2017

Yes, the change to signed data was introduced in release 2014.08.1.

@mossmann mossmann closed this Jan 25, 2017

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