[GreenKeys] FSK Audio files for Test and Evaluation

[John Spigel]

I've posted some more TTY afsk mp3 files at 5bits.net. These are old 
"picture" pix files that I batched from text. There are too many to 
test, and would take a few miles of paper, using both sides. So feedback 
is welcome. Both 170 shift and 850 shift, second column.

If there are more sources, I can add more. Let me know. Thanks!
73, John W1AN

On 03-May-25 13:15, Jeffrey Golas wrote:
> For W1AN DE NJ2BB
> 
> Files worked great! 850 shift worked out of the box.
> 
> ctre74h787v5cl7ioc372.png
> Video May 03 2025, 12 32 52 PM.mov <https://www.dropbox.com/scl/fi/ 
> ctre74h787v5cl7ioc372/Video-May-03-2025-12-32-52-PM.mov? 
> rlkey=fx8c62hj8m8bdmuqkgx6sxt0n&st=o5dp30qa&dl=0>
> dropbox.com <https://www.dropbox.com/scl/fi/ctre74h787v5cl7ioc372/Video- 
> May-03-2025-12-32-52-PM.mov? 
> rlkey=fx8c62hj8m8bdmuqkgx6sxt0n&st=o5dp30qa&dl=0>
> 
> <https://www.dropbox.com/scl/fi/ctre74h787v5cl7ioc372/Video- 
> May-03-2025-12-32-52-PM.mov? 
> rlkey=fx8c62hj8m8bdmuqkgx6sxt0n&st=o5dp30qa&dl=0>
> 
> 
> (Video for GK only, Ill do a better one later)
> 
> Jeff
> 
>> On May 2, 2025, at 12:07 AM, John Spigel <w1an.dxusa at gmail.com> wrote:
>>
>> Thanks Harold. Much of this codeing is new to me and I only got into 
>> the workings of audio compression in the last day or so. I'm using 
>> ffmpeg. My code can batch process so will run quickly through multiple 
>> files I process first through my text editor.
>>
>> The positive responses posted here on greenkeys encouraged me to add 
>> 50 Baud EU FSK audio to the 5bits.net site which may be useful. (And 
>> it was easy)
>>
>> 73, John W1AN
>>
>> On 01-May-25 23:39, Harold Hallikainen via GreenKeys wrote:
>>> They work great! I tested the 45 baud 170 Hz and 850 Hz shift. Both
>>> printed perfectly.
>>> I also ran one of the files through
>>> https://www.maztr.com/audiofileanalyzer and find that you are doing 8
>>> ksps, 16 bits per sample, and through MP3 compression, sending at 20.2
>>> kbps.
>>> Very nice! My New York Time feed ( https://w6iwi.org/rtty/audio/nyt/ )
>>> also runs at 8 ksps but with 8 bit samples and no compression for 64 
>>> kbps.
>>> Harold
>>> On Thu, May 1, 2025 11:43 am, John Spigel wrote:
>>>> From software I'm creating I've put together a couple of FSK audio
>>>> files for outside evaluation of audio and decode quality. The tones
>>>> themselves are generated in python. These are large 60M mp3 files. If
>>>> able, please open, test and let me know if they are good to go or need
>>>> some further filtering. I also may be able to compact further. Audacity
>>>> says the noise is about 60db down, but that's not what the real 
>>>> world may
>>>> see. There is both 170 and 850 cps shift. Thanks! And I'll have more of
>>>> these soon.
>>>>
>>>> https://5bits.net
>>>>
>>>>
>>>> 73, John W1AN
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