[Bug 513957] [NEW] CW output tone is "ringy" on some audio devices

[Kamal Mostafa]

Public bug reported:

Binary package hint: unixcw

For some audio devices (soundcards) the Morse code 800 Hz output tone
generated by cwlib is "ringy" (sounds as if it is being modulated by
another tone).

The 'cwlib' library tries to set the DSP sample rate to 8192 Hz and the
fragment size to 2^7 == 128.  On audio devices where a different
fragment size is returned for that rate, the audio output sounds
"ringy":

TESTCASE:
$  echo T  |  CWLIB_DEBUG=0x4  cw -w 4  2>&1  |  grep fragment
cw: dsp fragment size not set, 131

(For audio devices which accept that fragment size and rate, the
"fragment size not set" line will not appear and the tone will sound
fine).

** Affects: unixcw (Ubuntu)
     Importance: Undecided
         Status: New

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CW output tone is "ringy" on some audio devices
https://bugs.launchpad.net/bugs/513957
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