Re: NTSC Receiver

GNU Radio
1

can you send me the output from the console? and the command line you
used.

-Daniel

----- Original Message ----
From: John C. [email protected]
To: Daniel G. [email protected]
Cc: GNURadio D.ion List [email protected]
Sent: Friday, February 23, 2007 1:16:55 PM
Subject: Re: [Discuss-gnuradio] NTSC Receiver

Daniel G. schrieb:

Hello,

I’ve completed a prototype for an NTSC decoder blockset for gnu radio.
It’s not very sophisticated but it lets you see video on the screen
using gr-video-sdl. My development platform is Ubuntu 6.10 x86.

All I got was a black window. I know there is an analog TV station on
the channel because my current work
is using the USRP + fft to monitor the spectrum. When I display the FFT
there is clearly a analog TV chanel
with a ‘classic’ signature… i.e. clearly deliniated peaks for all
signal elements, Video, Chomanence, and Audio.

What could be going wrong with my setup.

John C…

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2

Daniel G. schrieb:

can you send me the output from the console? and the command line you used.

-Daniel
This is what I get:

./usrp_tv_rcv_testingNTSC.py -n -f 477.25 -d 26
Using RX d’board A: TV Rx Rev 3
width:156
height:262
d_output_buffer_size:40872
LEADING_EDGE_DETECTION_THRESHOLD: 0.9
TRAILING_EDGE_DETECTION_THRESHOLD: 0.3
SDL screen_mode 32 bits-per-pixel
SDL overlay_mode 842094169
FYI: No Powermate or Contour Knob found

TV Channel 15 should be 476 - 482, and the Video at 477.25, which
I see on my FFT display of the channel.

John C…

3

On 2/23/07, John C. [email protected] wrote:

Daniel G. schrieb:

can you send me the output from the console? and the command line you used.

-Daniel
This is what I get:

./usrp_tv_rcv_testingNTSC.py -n -f 477.25 -d 26

This may be a stupid question, but does it matter that the frequency
specified there does not have the “M” suffix that the example webpage
uses?

./usrp_tv_rcv_testingNTSC.py -n -f 477.25 -d 26

./usrp_tv_rcv_testingNTSC.py -n -f 481.25M -d 26

R C