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Voice conversion software

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sprocket
======


Voice conversion software - Voice conversion (VC) is a technique to convert a speaker identity of a source speaker into that of a target speaker. This software enables the users to develop a traditional VC system based on a Gaussian mixture model (GMM) and a vocoder-free VC system based on a differential GMM (DIFFGMM) using a parallel dataset of the source and target speakers.

## Paper and slide
- K. Kobayashi, T. Toda, "sprocket: Open-Source Voice Conversion Software," Proc. Odyssey, pp. 203-210, June 2018.
[[paper]](https://nuss.nagoya-u.ac.jp/s/h8YKnq6qxjjxtU3)

- T. Toda, "Hands on Voice Conversion," Speech Processing Courses in Crete (SPCC), July 2018.
[[slide]](https://www.slideshare.net/NU_I_TODALAB/hands-on-voice-conversion)

## Conversion samples
- Voice Conversion Challenge 2018 [[zip]](https://nuss.nagoya-u.ac.jp/index.php/s/Cs0YbTCw85p3QDK)


## Purpose
### Reproduce the typical VC systems

This software was developed to make it possible for the users to easily build the VC systems by only preparing a parallel dataset of the desired source and target speakers and executing example scripts.
The following VC methods were implemented as the typical VC methods.

#### Traditional VC method based on GMM
- T. Toda, A.W. Black, K. Tokuda, "Voice conversion based on maximum likelihood estimation of spectral parameter trajectory," IEEE Transactions on Audio, Speech and Language Processing, Vol. 15, No. 8, pp. 2222-2235, Nov. 2007.

#### Vocoder-free VC method based on DIFFGMM
- K. Kobayashi, T. Toda, S. Nakamura, "F0 transformation techniques for statistical voice conversion with direct waveform modification with spectral differential," Proc. IEEE SLT, pp. 693-700, Dec. 2016.

### Supply Python3 VC library
To make it possible to easily develop VC-based applications using Python (Python3), the VC library is also supplied, including several interfaces, such as acoustic feature analysis/synthesis, acoustic feature modeling, acoustic feature conversion, and waveform modification.
For the details of the VC library, please see sprocket documents in (coming soon).

## Installation & Run

Please use NOT Python2 BUT Python3.

### Current stable version

Ver. 0.18.1

### Install sprocket

```
pip install numpy==1.15.4 cython # for dependency
pip install sprocket-vc
```

### Run example

See [VC example](docs/vc_example.md)

## REPORTING BUGS

For any questions or issues please visit:

```
https://github.com/k2kobayashi/sprocket/issues
```

## COPYRIGHT

Copyright (c) 2017 Kazuhiro KOBAYASHI

Released under the MIT license

[https://opensource.org/licenses/mit-license.php](https://opensource.org/licenses/mit-license.php)

## ACKNOWLEDGEMENTS
Thank you [@r9y9](https://github.com/r9y9) and [@tats-u](https://github.com/tats-u) for lots of contributions and encouragement helps before release.

## Who we are
- Kazuhiro Kobayashi [@k2kobayashi](https://github.com/k2kobayashi) [maintainer, design and development]

- [Tomoki Toda](https://sites.google.com/site/tomokitoda/) [advisor]

Changelog
=========

0.18.3 (2019/04/24)
------------------

- Implement several functions for GMM-based VC and minor bugfix
- #133
- #132
- #130
- #127

0.18 (2017/10/01)
------------------

- Release first ver.
- Baseline system for [Voice Conversion Challenge 2018](http://www.vc-challenge.org/)


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