Biography

I have a BSc degree in Computer Engineering (2016) and a MSc degree in Computer Science (2017) conferred by Federal University of Pará (UFPA), Brazil. I’ve also spent one year (2014) as exchange student at the Óbuda University (OE) in Budapest, Hungary. Currently, I am a PhD student in Computer Science at UFPA, in Brazil. Some of my professional experiences include speech recognition for desktop, mobile and embedded platforms; as well as in developing alternative control interfaces for people with disabilities.

Interests

  • Speech Recognition
  • Natural Language Processing
  • Assistive Technology
  • Linux-based SBC Computers
  • Human-Computer Interaction

Education

  • PhD student in Computer Science, 2020

    Current role at Federal University of Pará

  • MSc in Computer Science, 2017

    Federal University of Pará

  • BSc in Computer Engineering, 2016

    Federal University of Pará

Skills

What am I (supposed to be) good at?

Speech Recognition

CMU Sphinx, Kaldi, HTK, and Julius for Brazilian Portuguese

Embedded Hardware

Raspberry Pi, Beagleboard, C.H.I.P., Arduino, etc.

Assistive Technology

Software- and hardware-based solutions for people with visual, hearing and upper-limb motor disabilities

Genetic Algorithms

Routing and wavelength assignment (RWA) simulation in WDM-optical networks

Linux & Tools

Arch, XMonad, Vim, Git, Python, C, LaTeX, etc.

Speech Synthesis

HTS, Klatt

Experience

 
 
 
 
 

PhD in Computer Science

Federal University of Pará (UFPA)

Dec 2017 – Dec 2021 Belém, Brazil

Speech-based technologies:

  • Kaldi ASR for Brazilian Portuguese
  • Utterance copy TTS in English using Klatt and deep learning techniques
 
 
 
 
 

MSc in Computer Science

Federal University of Pará (UFPA)

Mar 2017 – Dec 2017 Belém, Brazil

A universal remote control system in C++ for people with upper-limb motor disabilities, so they could control a TV via alternative methods.

  • OpenCV for head gesture recognition
  • PocketSphinx for speech recognition
  • Adaptive switches in hardware
 
 
 
 
 

Research Internship

Embrapa

Mar 2016 – Dec 2016 Belém, Brazil
A simulator in Python for the routing and wavelength assignment (RWA) problem over transparent, wavelength-multiplexed optical networks using Genetic Algorithms.
 
 
 
 
 

Summer Internship

Óbuda University (OE)

Mar 2014 – Jan 2015 Budapest, Hungary

Development of speech (English) modules for controlling Teki: a personal home assistant, Turtlebot-based robot

  • PocketSphinx desktop on Linux + ROS (offline)
  • Android’s Google ASR (online Wi-Fi UDP connection)
 
 
 
 
 

Research Internship

Federal University of Pará (UFPA)

Jan 2012 – Feb 2016 Belém, Brazil

Development of resources and applications for spech recognition in Brazilian Portuguese:

  • PyQt4 CFG/BNF grammar tester for Julius
  • Acoustic model training on CMU Sphinx for KDE Simon Listens
  • Android client + Julius server vs. Google’s Android ASR

Recent Posts

Free Online Courses

I decided to post some comments about some excellent online courses related to computing and engineering that I’ve started to take during Covid-19 self-quarantine. Literally all of them are available for free on YouTube.

Jun 29, 2020 2 min read

Projects

Head Remote

A system where user’s head gestures are translated into remote commands to electronic devices

Speech Remote

A remote control system that translates the user’s spoken words into commands to electronic devices

ASR BBB

Speech recognition and TV remote control using Android and BeagleBone Black

Featured Publications

Cassio Batista, Renan Cunha, Pedro Batista, Aldebaro Klautau, Nelson Neto
July 2019 In Proc. BRACIS 2019
Utterance Copy in Formant-based Speech Synthesizers Using LSTM Neural Networks

Utterance Copy in Formant-based Speech Synthesizers Using LSTM Neural Networks

Estimating the input parameter of Klatt88 formant-based speech synthesizer with long short-term memory neural nets (LSTM).

Cassio Batista, Larissa Dias, Nelson Neto
November 2018 In Proc. IberSPEECH 2018
Baseline Acoustic Models for Brazilian Portuguese Using Kaldi Tools

Baseline Acoustic Models for Brazilian Portuguese Using Kaldi Tools

The first attempt to create scripts and baseline acoustic models for Brazilian Portuguese using Kaldi tools.

PDF Code Poster DOI
Cassio Batista, Erick Campos, Nelson Neto
October 2017 In Proc. of IHC 2017
A Proposal of a Universal Remote Control System Based on Head Movements

A Proposal of a Universal Remote Control System Based on Head Movements

An open-source, low cost universal remote control system that translates user’s head poses into commands to electronic devices. In addition, a proximity sensor circuit was combined to radio-frequency modules in order to act as a wireless switch.

PDF Code Project Video DOI
Diego Teixeira, Cassio Batista, Afonso Cardoso, Josivaldo Araújo
August 2017 In Progress in Artificial Intelligence (EPIA'17)
A Genetic Algorithm Approach for Static Routing and Wavelength Assignment in All-Optical WDM Networks

A Genetic Algorithm Approach for Static Routing and Wavelength Assignment in All-Optical WDM Networks

A genetic algorithm that aims at solving the RWA problem, which consists of choosing the most suitable lightpath (i.e., a combination of a route and a wavelength channel) between a source-destination pair of nodes in all-optical networks.

PDF Code DOI
Cassio Batista, Thiago Coelho, Bruno Haick, Nelson Neto, Aldebaro Klautau
February 2014 In Proc. of 19th FMTU 2014
LaPS CSR: A Free Distributed Cloud Speech Recognition System

LaPS CSR: A Free Distributed Cloud Speech Recognition System

This paper describes a cloud speech recognition service in Brazilian Portuguese based on Julius decoder running in server mode. The client side was built on the Android 2.2 platform.

PDF Code

Recent Publications

Evaluating Alternative Interfaces Based on Puff, Electromyography and Dwell Time for Mouse Clicking

Statistical comparison among three different types of mouse click: mouth puffing, EMG and dwell-time. Two out of these three methods have been developed in hardware and their schematics been open-sourced.
Erick Campos, Denis Martins, Suzane dos Santos, Renan Cunha, Cassio Batista, Nelson Neto
Code
Evaluating Alternative Interfaces Based on Puff, Electromyography and Dwell Time for Mouse Clicking

Utterance Copy in Formant-based Speech Synthesizers Using LSTM Neural Networks

Estimating the input parameter of Klatt88 formant-based speech synthesizer with long short-term memory neural nets (LSTM).
Cassio Batista, Renan Cunha, Pedro Batista, Aldebaro Klautau, Nelson Neto
Utterance Copy in Formant-based Speech Synthesizers Using LSTM Neural Networks

Baseline Acoustic Models for Brazilian Portuguese Using Kaldi Tools

The first attempt to create scripts and baseline acoustic models for Brazilian Portuguese using Kaldi tools.
Cassio Batista, Larissa Dias, Nelson Neto
PDF Code Poster DOI
Baseline Acoustic Models for Brazilian Portuguese Using Kaldi Tools

Static-Traffic Routing and Wavelength Assignment in Transparent WDM Networks Using Genetic Algorithm

A genetic algorithm for solving the RWA problem, which consists of choosing the most suitable lightpath (i.e., a combination of a route and a wavelength channel) between a source-destination pair of nodes over four all-optical WDM network topologies.
Cassio Batista, Diego Teixeira, Thiago Coelho, Josivaldo Araújo
PDF Code DOI
Static-Traffic Routing and Wavelength Assignment in Transparent WDM Networks Using Genetic Algorithm

Improving Metagenomic Assemblies Through Data Partitioning: A GC Content Approach

GCSplit: an open-source, bioinformatic tool which partitions metagenomic sequences into subsets using a computationally inexpensive metric: the GC content.
Fábio Miranda, Cassio Batista, Artur Silva, Jefferson Morais, Nelson Neto, Rommel Ramos
PDF Code DOI
Improving Metagenomic Assemblies Through Data Partitioning: A GC Content Approach
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