37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
Sonic is a simple algorithm for speeding up or slowing down speech. However,
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it's optimized for speed ups of over 2X, unlike previous algorithms for changing
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speech rate. The Sonic library is a very simple ANSI C library that is designed
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to easily be integrated into streaming voice applications, like TTS back ends.
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The primary motivation behind Sonic is to enable the blind and visually impaired
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to improve their productivity with open source speech engines, like espeak.
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Sonic can also be used by the sighted. For example, Sonic can improve the
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experience of listening to an audio book on an Android phone.
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A native Java port of Sonic is in Sonic.java. Main.java is a simple example of
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how to use Sonic.java. To play with it, you'll need a "talking.wav" file in the
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current directory, and you'll want to change the speed, pitch or other
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parameters manually in Main.java, in the main method.
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Sonic is Copyright 2010, 2011, Bill Cox, all rights reserved. It is released
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under the Apache 2.0 license, to promote usage as widely as possible.
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Performance test:
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I sped up a 751958176 byte wav file with sonic (a 9 hour, 28 minute mono audio
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file encoded at 16-bit 11.KHz), but with the output writing disabled. The
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reported time, running Ubuntu 11.04 on my HP Pavilion dm4 laptop was:
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real 0m50.839s
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user 0m47.370s
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sys 0m0.620s
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The Java version is not much slower. It reported:
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real 0m52.043s
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user 0m51.190s
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sys 0m0.310s
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Author: Bill Cox
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email: waywardgeek@gmail.com
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