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LCWO Discussion Forum [Atom LCWO Forum Feed]

This is a simple discussion forum for LCWO users. Feel free to use it for any kind of discussion related to this website.

Thread: MP3 Format

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Posted: 2020-12-28 21:51

if I convert Convert text to CW, the resulting file format is

MPEG ADTS, layer III, v2.5, 16 kbps, 11.025 kHz, Monaural

Unfortunately my mp3 player (Tascam DR-05) needs

MP3: 32 Kbit/s, 64 Kbit/s, 96 Kbit/s, 128 Kbit/s,
192 Kbit/s, 256 Kbit/s, 320 Kbit/s

so it could not read the file.

I converted to

Audio file with ID3 version 2.4.0, contains:MPEG ADTS, layer III, v2.5, 32 kbps, 11.025 kHz, Monaural

Still it can not read the mp3 files.

Any idea what is wrong?


Posted: 2020-12-28 22:08

Did you try:-

./ebook2cw -b 32



Posted: 2020-12-28 23:26

ebook2cw -w 20 -f 500 -b 32 -s 22050 -u -o most_common_170_words_qso_02.mp3 most_common_170_words_qso_02.txt

the same result, the Tascam DR-05 recorder does not play.

It plays with the vlc on the Xubuntu Computer.

It plays on a cheap >10 years old MP3 Player, but the navigation and operation is tricky so I wanted to use the more comfortable Tascam.

It plays with vlc on a Android smartphone Sony Z2, but I get clicks, so that is not usable.

The best solution seem to be to purchase a more comfortable audio player.


Posted: 2020-12-29 01:14

You might try a sample rate of 48K before giving up . .

( it also says 44.1K )

Posted: 2020-12-29 06:20
Hi Ruediger,

Why not just get an IPod ?

I got a later model a year and a half ago (new old stock on EBay) and it works like a charm with ebook2cw and "Convert Text to CW".

As it is absolutely tiny, I can clip it to my collar and go about my daily affairs while listening to morse.

73 ID

Posted: 2020-12-29 16:41
Hi cb and Chris,

I had to change the audio settings in VLC on my Sony Z2 from AudioTrack to OpenSL ES. Now it works fine.

Therefore I don't need a new smartphone, the Z2 is only 6 years old ;-)

Thanks for help.


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