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1These wav files show how Sonic performs at increasing speech rates.  All sound
2sampels are in the public domain.
3
4sonic.wav
5This is a sonic 2X sped-up version of a public domain librivox.org recording, from
6the audiobook "Princess of Mars".
7
8soundtouch.wav
9This is the same recording as sonic.wav, but sped up using soundtouch, which
10uses WSOLA rather than the sonic algorithm.  Even at 2X speed up, you should be
11able to hear the characteristic WSOLA distortion relative to the sonic version.
12
13talking.wav
14This is my father talking, using a decent microphone and 44KHz sample rate.
15
16talking_2x.wav
17This is his voice sped up by 2X using Sonic.
18
19espeak_s450.wav
20Sonic also performs well at increasing the speed of synthesized speech.
21espeak_s450.wav was generated using 'espeak -s450 -f test1.txt -w
22espeak_s450.wav'.  This is the highest speed currently supported by espeak,
23though Sonic can speed up espeak to much faster rates.
24
25espeak_sonic.wav
26This was generated with 'espeak -f test1.txt -w out.wav;
27sonic 2.6 out.wav espeak_sonic.wav'.  Sonic sped it up 2.6X, which is about the
28same speed as espeak at -s450.  I personally feel that the sonic sped up sample
29sounds better than espeak at -s450.
30
31twosineperiods.wav
32This is just two sine periods, which is too short to hear.  However, it's
33useful for making sure the flush function works correctly.  A 2-X speedup should
34result in one sine period with no distortion.
35