[GreenKeys] FSK Audio files for Test and Evaluation

[John Spigel]

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
>> ______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GreenKeys at mailman.qth.net
>>
>>
>>>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>>>> https://teletype.net/gksearch
>>>>> 2002-to-present greenkeys archive:
>>>>> http://mailman.qth.net/pipermail/greenkeys/
>>>>> 1998-to-2001 greenkeys archive:
>>>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>>>> http://comcents.com/tty/greenkeyssearch.html
>>>>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to harold at w6iwi.org
>>
>>
> 
>