Subject description - AD2M31ZRE

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AD2M31ZRE Speech technology in telecommunications
Roles:PO, V Extent of teaching:14KP+6KC
Department:13131 Language of teaching:CS
Guarantors:  Completion:Z,ZK
Lecturers:  Credits:6
Tutors:  Semester:Z


The subject is devoted to basis of speech processing addressed to students of master program with special focus on multimedia applications. Discussed speech technology is currently applied in many systems in different fields (e.g. information dialogue systems, voice controlled devices, dictation systems or transcription of audio-video recordings, support for language teaching, etc.). Further information can be found at . Detailed information for registered students can be found at teaching portal .

Study targets:

The goals of the subject is to introduce used speech technology in the most important multimedia applications. Students should manage the knowledge as basic characteristics of speech signal, speech enhancement, speech recognition, speech synthesis, audio-visual speech processing, etc. Students will practice basic tasks of speech processing in MATLAB environment and also other publicly available tools for speech analysis will be used. As a homework, students will elaborate semester project which will be presented at the exercise according to planned schedule.

Course outlines:

1. Introduction - speech signal (digital form), speech production model
2. Basic characteristics of speech signal, phonetic and articulatory aspects
3. Spectral characteristics of speech signal (DFT and LPC spectrum)
4. Noise suppression in speech signal (additive and convolution noise, one-channel, multi-channel)
5. Hearing aids and cochlear implants (anatomy and hearing model, speech processing)
6. Principles of speech recognition, basic tasks ad applications
7. Feature extraction for speech recognition
8. Small vocabulary speech recognition based on DTW and HMM (HTK)
9. Dictation and transcription systems (large vocabulary speech recognition)
10. Speaker verification and identification.
11. Speech synthesis - basic principles (concatenative and formant synthesis, PSOLA)
12. Audio-visual speech recognition
13. Multimedia systems with voice input (dialog systems, logopaedy, language teaching)
14. Language recognition. Reserve.

Exercises outline:

1. Introduction: speech signal, tools for analysis, sources of speech signals
2. Basic time-domain characteristics: energy, intensity, zero-crossing, fundamental frequency
3. Spectral characteristics: short-time DFT and LPC spectrum, spectrogram
4. Suppression of additive noise in speech signal
5. Convolutory noise suppression
6. Speech processing for hearing aids and cochlear implants
7. Cepstrum and cepstral distance: voice activity detection, features for recognition
8. DTW based recognition: simple recognizer of particular words
9. HMM based recognition: basic tasks and demonstration of HMM modelling
10. Speaker verification based on GMM
11. Speech synthesis: implementation of formant synthesis, demonstration of available tools
12. Semester work presentations
13. Semester work presentations
14. Reserve. Credits


[1] Huang, X. - Acero, A. - Hon, H.-W.: Spoken Language Processing. Prentice Hall 2001.


Bases of digital signal processing are supposed as preliminary knowledge.



speech processing, speech recognition, speech enhancement, speech coding, speech synthesis

Subject is included into these academic programs:

Program Branch Role Recommended semester
MKEEM1 Technological Systems V 2
MKEEM5 Economy and Management of Electrical Engineering V 2
MKEEM4 Economy and Management of Power Engineering V 2
MKEEM3 Electrical Power Engineering V 2
MKEEM2 Electrical Machines, Apparatus and Drives V 2
MKKME2 Multimedia Technology PO 3
MKOI1 Artificial Intelligence V 2
MKOI5 Software Engineering V 2
MKOI4 Computer Graphics and Interaction V 2
MKOI3 Computer Vision and Image Processing V 2
MKOI2 Computer Engineering V 2
MKKYR4 Aerospace Systems V 2
MKKME5 Systems of Communication PO 2
MKKYR1 Robotics V 2
MKKYR3 Systems and Control V 2
MKKYR2 Sensors and Instrumentation V 2

Page updated 14.8.2020 17:51:49, semester: Z,L/2020-1, L/2019-20, Send comments about the content to the Administrators of the Academic Programs Proposal and Realization: I. Halaška (K336), J. Novák (K336)