[Discuss-gnuradio] Same File Size
Hello All, I am expecting to see a similiar file size in a simple test file that im running and I don't get that. Is there something Im missing? USRP2-FileSink SignalSource-Throttle-FileSink I have checked obvious things. The USRP2 block is set to a decimation of 400. Given the 100MS/s rate of the USRP2 I expect the stream to be 250e3 MS/s. So I set the overall sample rate to 250e3. I have also set the datatypes of all the blocks to floats. The Throttle is set to 250e3. If it matters the signal source is set to a saw tooth,1Hz. Im more interested in knowing that samples read back out of the files are synchronized. So I guess it doesn't matter if they are the same length if all this mean is that I need to trim the files to the same length. Thanks, Justin ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Same File Size
On Wed, Sep 29, 2010 at 04:14:18PM -0400, Justin Bracken wrote: Hello All, I am expecting to see a similiar file size in a simple test file that im running and I don't get that. Is there something Im missing? USRP2-FileSink SignalSource-Throttle-FileSink I have checked obvious things. The USRP2 block is set to a decimation of 400. Given the 100MS/s rate of the USRP2 I expect the stream to be 250e3 MS/s. So I set the overall sample rate to 250e3. I have also set the datatypes of all the blocks to floats. The Throttle is set to 250e3. If it matters the signal source is set to a saw tooth,1Hz. Im more interested in knowing that samples read back out of the files are synchronized. So I guess it doesn't matter if they are the same length if all this mean is that I need to trim the files to the same length. Thanks, Justin If you want a particular number of samples in a file, etc., use gr.head. Generally you SHOULD NOT be using throttle. throttle causes so much confusion, I'm of the opinion that we should remove it from the code base. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Same File Size
-- Forwarded message -- From: Justin Bracken scourc...@gmail.com Date: Wednesday, September 29, 2010 Subject: Same File Size To: Eric Blossom e...@comsec.com Are the samples in the files synced? I.e. The sample at index 1 in file1 is recorded at the same time as the sample at index 1 in file2? In which case file length is irrelevant. On Sep 29, 2010, at 4:20 PM, Eric Blossom e...@comsec.com wrote: On Wed, Sep 29, 2010 at 04:14:18PM -0400, Justin Bracken wrote: Hello All, I am expecting to see a similiar file size in a simple test file that im running and I don't get that. Is there something Im missing? USRP2-FileSink SignalSource-Throttle-FileSink I have checked obvious things. The USRP2 block is set to a decimation of 400. Given the 100MS/s rate of the USRP2 I expect the stream to be 250e3 MS/s. So I set the overall sample rate to 250e3. I have also set the datatypes of all the blocks to floats. The Throttle is set to 250e3. If it matters the signal source is set to a saw tooth,1Hz. Im more interested in knowing that samples read back out of the files are synchronized. So I guess it doesn't matter if they are the same length if all this mean is that I need to trim the files to the same length. Thanks, Justin If you want a particular number of samples in a file, etc., use gr.head. Generally you SHOULD NOT be using throttle. throttle causes so much confusion, I'm of the opinion that we should remove it from the code base. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Same File Size
If throttle is removed then how can we prevent the cpu being used up if there is not rate limiting block in the flowgraph ? On Wed, Sep 29, 2010 at 1:46 PM, Justin Bracken scourc...@gmail.com wrote: -- Forwarded message -- From: Justin Bracken scourc...@gmail.com Date: Wednesday, September 29, 2010 Subject: Same File Size To: Eric Blossom e...@comsec.com Are the samples in the files synced? I.e. The sample at index 1 in file1 is recorded at the same time as the sample at index 1 in file2? In which case file length is irrelevant. On Sep 29, 2010, at 4:20 PM, Eric Blossom e...@comsec.com wrote: On Wed, Sep 29, 2010 at 04:14:18PM -0400, Justin Bracken wrote: Hello All, I am expecting to see a similiar file size in a simple test file that im running and I don't get that. Is there something Im missing? USRP2-FileSink SignalSource-Throttle-FileSink I have checked obvious things. The USRP2 block is set to a decimation of 400. Given the 100MS/s rate of the USRP2 I expect the stream to be 250e3 MS/s. So I set the overall sample rate to 250e3. I have also set the datatypes of all the blocks to floats. The Throttle is set to 250e3. If it matters the signal source is set to a saw tooth,1Hz. Im more interested in knowing that samples read back out of the files are synchronized. So I guess it doesn't matter if they are the same length if all this mean is that I need to trim the files to the same length. Thanks, Justin If you want a particular number of samples in a file, etc., use gr.head. Generally you SHOULD NOT be using throttle. throttle causes so much confusion, I'm of the opinion that we should remove it from the code base. Eric ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
