Re: Python script with Head block runs too long before exiting

[Jeff Long]

Please keep discussions on the mailing list.

I don't know the exact reason the program runs for 3 seconds after the file
is finished. You could try stubbing out various portions of the flowgraph,
e.g., put a Null or Noise Source and Throttle (with the limit set to 100ms)
before the Resampler to see if the blocks before that are responsible.

On Sun, Feb 25, 2024 at 1:01 PM Elmore Family  wrote:

> Jeff,
>
> The wave file does contain the correct number of samples. You mention that
> the latency is before the Head block. Note that the file fills for 13.14
> sec (157680 samples) starting at the marked time and then it is 3 more
> seconds before exit.
>
> Jim
>
> *From:* Jeff Long
> *Sent:* Sunday, February 25, 2024 11:44 AM
> *To:* Elmore Family
> *Subject:* Re: Python script with Head block runs too long before exiting
>
> At 12~48kS/s, it is possible that there is 3 sec of latency before the
> Head block. However, there should only be around 157680 samples in the wav
> file when the program finishes. Smaller output buffers
> (set_max_output_buffer()) on the block before Head may help reduce latency.
>
> On Sun, Feb 25, 2024 at 11:21 AM Elmore Family  wrote:
>
>> The attached file is run as a thread of a larger project. I run this as a
>> script and not a GUI.
>>
>> The script waits for a real time of 15 or 45 seconds to begin execution
>> of the flowgraph. The Head block is set at 157680 which is 13.14 seconds at
>> 12000 samples/sec. The Head block feeds a Wave file sink.
>>
>> The program works as it should properly storing data in the wave file
>> except for the issue below.
>>
>> The issue is that I expect the script (flowgraph) to cease execution at
>> 13.14 seconds. This is based on my understanding of the operation of a Head
>> block. However, it continues to run(?) for another approximately 3+ secs
>> before exiting. Needless to say this creates huge timing issues for the
>> rest of the program.
>>
>> Any ideas?
>>
>> Jim
>>
>>
>> 
>> Virus-free.www.avg.com
>> 
>>
>

Python script with Head block runs too long before exiting

[Elmore Family]

The attached file is run as a thread of a larger project. I run this as a 
script and not a GUI.

The script waits for a real time of 15 or 45 seconds to begin execution of the 
flowgraph. The Head block is set at 157680 which is 13.14 seconds at 12000 
samples/sec. The Head block feeds a Wave file sink.

The program works as it should properly storing data in the wave file except 
for the issue below.

The issue is that I expect the script (flowgraph) to cease execution at 13.14 
seconds. This is based on my understanding of the operation of a Head block. 
However, it continues to run(?) for another approximately 3+ secs before 
exiting. Needless to say this creates huge timing issues for the rest of the 
program.

Any ideas?

Jim

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FT8_Receive.py
Description: Binary data

BER

[Jiya Johnson]

Greetings all,
 Need help to generate BER plot for CCSDS encoder-decoder with soft
decision(euclidean distance) decoding. I am getting constant BER throughout
the plot and sometimes more than 5.5dB is getting for soft decoding.

[VOLK] Maintenance release 3.1.2

[Johannes Demel]

Hi everyone!

This is the VOLK v3.1.2 release! We want to thank all contributors.
This release wouldn't have been possible without them.

https://www.libvolk.org/release-v312.html

The last maintenance release revealed issues in areas that are difficult 
to test. While the changes to the library should be minimal, usability 
should be improved. Most notably, we build and deploy [the VOLK 
documentation](https://www.libvolk.org/docs) automatically now.


### Contributors

- Andrej Rode 
- Clayton Smith 
- Johannes Demel , 
- Marcus Müller 
- Rick Farina (Zero_Chaos) 

### Changes

- Documentation improvements, and automatically generate and publish
- docs: Add VOLK doc build to CI
- docs: Add upload to GitHub actions
- cpu_features: Update hints in README
- Remove sse2neon with a native NEON implementation
- Replace sse2neon with native NEON
- Remove loop unrolling
- Simplify Spiral-generated code
- Improve CI pipeline with new runner
- flyci: Test CI service with M2 instance
- actions: Update GH Actions checkout
- Auto-format CMake files
- cmake: Add .cmake-format.py
- cmake: Apply .cmake-format.py
- Release script fixes
- scripts/release: fix multi-concatenation of submodule tars
- shellcheck fixes
- bash negative exit codes are not portable, let's be positive