[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Discuss-gnuradio] Questions on usrp_tv_rcv.py

From: Anastasopoulos Achilleas
Subject: [Discuss-gnuradio] Questions on usrp_tv_rcv.py
Date: Tue, 23 Jan 2007 13:15:31 -0500 (EST)

Thanks for pointing out all theses raw files
for testing the usrp_tv_rcv.py application.
I tried a couple of them and they work fine.

Now I have the following question:

Why is it that the video shown on sdl moving
slowly to the right?

The fact that there is no vertical or horizontal
synchronization should NOT explain this:

I use a decimation of 8 thus the video rate is 8M.
With 625 lines per frame and 25 frames per second, this results in
512 samples per line (exactly), ie, 8,000,000/25/625=512.

So one would have expected to see the corresponding picture
not aligned in the vertical/horizontal dimension,
BUT AT LEAST the misallignment should have been CONSTANT over time.
This is clear in the vertical dimension (no up/down sliding)
but not in the horizontal...

What is the explanation of this?


PS: one explanation I can think of is the
instability of the 64M ADC...

reply via email to

[Prev in Thread] Current Thread [Next in Thread]