Digital Speech Transmission

Lecturer: Prof. Dr.-Ing. Peter Jax

Contact: Christiane AntweilerSebastian Nagel

Type: Master lecture

Credits: 4

Registration via RWTHonline

Course language: English

The textbook "Digital Speech Transmission" is used as lecture notes. It can be lent in the university library or in the Institute.

Full PDF access from RWTH network (VPN may be required from home office) or login via Shiboleth with your TIM account.

All powerpoint slides of the lecture and the problems of the exercise will be available for download at the RWTHmoodle learning room. 

These documents can be purchased on request from Simone Sedgwick.



from Thursday, October 10, 2024
08:30 - 10:00 AM
IKS, lecture room 4G


from Thursday, October 10, 2024
10:15 - 11:00 AM
IKS, lecture room 4G

Consultation Hours:

Monday, September 2, 2024
11:00-12:00 AM
IKS, lecture room 4G


Wednesday, September 4,  2024
8:30-10:00 AM

Exam duration: 90 minutes

The exam is in written form.

Resources: Except for a non-programmable pocket calculator, no materials are allowed for the examination.

The lecture "Digital Speech Transmission" is amongst others part of the master studies programm "Elektrotechnik, Informationstechnik und Technische Informatik. The formal connection to the module catalogs can be found at RWTHonline

We recommend the lecture "Audio Signal Enhancement", which takes place in the summer term, for further studies.


The lecture "Digital Speech Transmission" deals with the fundamentals of speech production, hearing, psycho-acoustic aspects and speech coding.

  • Spectral transformations
  • Stochastic signals and estimation
  • Linear prediction
  • Quantization
  • Speech coding: model-based predictive coding, vocoder, adaptive quantization, adaptive prediction in the time domain, adaptive coding in the frequency domain, subjective speech quality, standards, realization aspects
  • Error concealment and soft decision source decoding, reduction of annoying effects due to residual bit errors

The aim of this lecture is to teach on the one hand side the fundamental techniques and algorithms of digital speech processing. On the other hand side an overview of the state-of-the-art technology, actual applications and standards is presented. Exercises are offered for the course. Particular topics can be examined at the laboratories "Communications Engineering", "Real-Time Audio Processing", "Matlab Advanced - Digital Signal Processing", and "Audio Processing Using Python" in experiments which are coordinated with this lecture.

The lecture is based on the book: "Digital Speech Transmission", P. Vary, R. Martin, Wiley 2006.


The results of the evaluation of the last years are summarized below. Note: Since the lecture has been renamed in 2018, some evaluations are titled with the previous lecture name Digital Speech Processing I.

Winter Term 2023/24

Participants of the evaluation: 6
Global grade: 1,2
Concept of the lecture: 1,2
Instruction and behaviour: 1,1

Participatns of the evaluation: 9
Global grade: 1,2
Concept of the exercise: 1,1
Instruction and behaviour: 1,3