IEEE Circuits and Systems Magazine - Q4 2019 - 21

cal and rhythmic parameters can be manipulated easily.
Via suitable modification of the speech waveform, voice
conversion can convert non-/para-linguistic information as expected [10]. Table I lists several existing frameworks that are frequently applied for producing speech
and acoustic signals. Details of speech synthesis and
voice conversion techniques can be found in the overview papers and books of [3], [6], [7], [11].
In recent years, the research on anti-spoofing countermeasures to detect deliberate and unknown attacks
by artificial (e.g. synthesized) speech is becoming
more active [12]. Compared to other state-of-the-art

trained conversion function. After the conversion step,
the speech features are computed from the converted
features and used for synthesizing the converted utterance waveform.
Since the original formulation of the voice conversion problem was proposed in 1985, many VC techniques have been introduced [8]. The most popular
VC approach is the STRAIGHT (Speech Transformation and Representation using Adaptive Interpolation
of weiGHTed spectrum), which utilizes a combination
of spectral representations and voice conversion techniques [9]. With this VC system, the spectral, acousti-

Source
Speaker

Conversion
Function
Training

Time
Alignment

Conversion
Model

Target
Speaker
Training Phase
Conversion Phase

Mapping
Feature
Computation

Speech
Analysis

Conversion
Function

Input
Utterance

Speech
Feature
Computation

Speech
Synthesis

Converted
Utterance

Figure 2. A typical voice conversion system.

Table I.
Frameworks providing speech generation tools and methods.
Framework

Language

URL

MaryTTS

Java

http://mary.dfki.de/

eSpeak

C

http://espeak.sourceforge.net/

HTS

C

http://hts.sp.nitech.ac.jp/

Festvox/Festival

C++

http://festvox.org/

Idlak

C++

https://github.com/idlak/idlak

Merlin

Python

https://github.com/CSTR-Edinburgh/merlin

Ossian

Python

https://github.com/CSTR-Edinburgh/Ossian

GAN TTS

Python

https://github.com/r9y9/gantts

Sprocket

Python

https://github.com/k2kobayashi/sprocket

STRAIGHT

Matlab

https://github.com/HidekiKawahara/legacy_STRAIGHT

WORLD

C++/Matlab/Python

https://github.com/mmorise/World

FOURTH QUARTER 2019

IEEE CIRCUITS AND SYSTEMS MAGAZINE

21


http://mary.dfki.de/ http://espeak.sourceforge.net/ http://hts.sp.nitech.ac.jp/ http://www.festvox.org/ https://www.github.com/idlak/idlak https://www.github.com/CSTR-Edinburgh/merlin https://www.github.com/CSTR-Edinburgh/Ossian https://www.github.com/r9y9/gantts https://www.github.com/k2kobayashi/sprocket https://www.github.com/HidekiKawahara/legacy_STRAIGHT https://www.github.com/mmorise/World

IEEE Circuits and Systems Magazine - Q4 2019

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