https://github.com/waywardgeek/sonic

Simple library to speed up or slow down speech
https://github.com/waywardgeek/sonic

Last synced: 4 days ago
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Simple library to speed up or slow down speech

• Host: GitHub
• URL: https://github.com/waywardgeek/sonic
• Owner: waywardgeek
• License: apache-2.0
• Created: 2011-01-12T08:19:08.000Z (almost 14 years ago)
• Default Branch: master
• Last Pushed: 2023-10-12T22:32:47.000Z (about 1 year ago)
• Last Synced: 2024-07-31T19:23:24.925Z (5 months ago)
• Language: C
• Homepage:
• Size: 11.3 MB
• Stars: 603
• Watchers: 35
• Forks: 161
• Open Issues: 21
• Metadata Files:
  • Readme: README
  • License: LICENSE

Awesome Lists containing this project

• awesome-lists - sonic

README

        
Sonic is a simple algorithm for speeding up or slowing down speech.  However,

it's optimized for speed ups of over 2X, unlike previous algorithms for changing

speech rate.  The Sonic library is a very simple ANSI C library that is designed

to easily be integrated into streaming voice applications, like TTS back ends.

The primary motivation behind Sonic is to enable the blind and visually impaired

to improve their productivity with open source speech engines, like espeak.

Sonic can also be used by the sighted.  For example, Sonic can improve the

experience of listening to an audio book on an Android phone.

A native Java port of Sonic is in Sonic.java.  Main.java is a simple example of

how to use Sonic.java.  To play with it, you'll need a "talking.wav" file in the

current directory, and you'll want to change the speed, pitch or other

parameters manually in Main.java, in the main method.

Sonic is Copyright 2010, 2011, Bill Cox, all rights reserved.  It is released

under the Apache 2.0 license, to promote usage as widely as possible.

Performance test:

I sped up a 751958176 byte wav file with sonic (a 9 hour, 28 minute mono audio

file encoded at 16-bit 11.KHz), but with the output writing disabled.  The

reported time, running Ubuntu 11.04 on my HP Pavilion dm4 laptop was:

real    0m50.839s

user    0m47.370s

sys     0m0.620s

The Java version is not much slower.  It reported:

real    0m52.043s

user    0m51.190s

sys     0m0.310s

Update, May 7, 2017

-------------------

I upgraded the pitch change algorithm to use a 12-point sinc FIR filter for

interpolation, rather than linearly interpolating between points.  This

significantly reduces noise introduced by the pitch change algorithm.  It is

most noticable in low-sample-rate streams, such as the 11,025 Hz output of the

Eloquence TTS engine.  The upgrade is in both the C and Java versions.

Author: Bill Cox

email: [email protected]