Re: usb2 and usb3 ports drop samples while recording from airspy to /dev/null

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On 2014-12-18 16:23, Alan Stern wrote:
>>> The bug report says there should be 10 M samples per second.  How many
>>> bytes are in a sample?  2?
>>
>> I and Q samples are two bytes each.
> 
> What is an I sample?  What is a Q sample?  

I and Q samples describe the radio signal received by the airspy.

> Are there any samples that 
> aren't two bytes?

No that I am aware.

> You need to keep in mind that the people reading this mailing list know
> a lot about USB but don't know anything about Airspy devices.

In fact the airspy samples at 20 MSPS with 2 bytes per sample, but the
host converts that to the I/Q pairs at 10 MSPS, with 2 bytes for each I
and Q. (I was explained in #airspy)

Udo


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