Course detail

Low-frequency and Audio Electronics

FEKT-CNFEAcad. year: 2009/2010

Introduction to low-frequency and audio electronic and acoustics fundamentals. Low-frequency transmission description. Microphones and speakers. Low-frequency amplifiers classes. Pre-amplifiers, equalizers, dynamic compression and expansion amplifiers. Analog noise reduction. Power amplifiers (discrete, integrated, digital). Selected methods of analog measurements. Analog record of low-frequency signals (CC). Digital processing in low-frequency and audio electronics. A/D and D/A converters, DSP processing. Digital record of low-frequency signals without data reduction (CD-A, DAT). Data reduction and audio compression (MPEG, ATRAC, PASC). Digital record of low-frequency signals with data reduction (AC-3, DTS, DCC, MD) and high definition formats for audio (SACD, DVD-A). Digital audio broadcasting (T-DAB and DRM).

Language of instruction

English

Number of ECTS credits

6

Mode of study

Not applicable.

Guarantor

prof. Ing. Tomáš Kratochvíl, Ph.D.

Department

Department of Radio Electronics (UREL)

Learning outcomes of the course unit

Theoretical and practical knowledge of analog and digital audio technique and electronics area.

Prerequisites

The subject knowledge on the secondary school level is required.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

Assesment methods and criteria linked to learning outcomes

To obtain the credit the laboratory education must be passed. Control tests are optional. Final exam is written. Laboratory mesurements is evaluated with 30 point. Final exam with 70 points. Maximum is 100 points.

Course curriculum

Lectures:
1. Subject organization. Introduction to the audio electronic area.
2. Low-frequency transmission chain description (recording, reproduction, processing).
3. Principles of electroacoustic. Microphones and speakers.
4. Low-frequency amplifiers classes (A, AB, B, D, T).
5. Pre-amplifiers, loudness, dynamic compression and expansion.
6. Correction amplifiers, equalizers, low and high tone control.
7. Power amplifiers (discrete, integrated, digital with PWM).
8. Digital processing in low-frequency and audio electronics.
9. ADC and DAC converters for audio, DSP processing.
10. Digital record of audio without data reduction (PCM, CD-Audio, SACD, DVD-Audio).
11. Digital record of audio with data reduction (MD, MPEG, Dolby Digital, DTS).
12. Data reduction and audio compression (MP3, ACC, WMA, OGG, ATRAC etc.).
13. Digital audio broadcasting (T-DAB and DRM).

Laboratory exercise:
1. Preamplifier characteristics with adjustable sensitivity and RIAA corrections.
2. Correction amplifier, tone control and loudness.
3. Digital power amplifier class T characteristics.
4. Stereo audio filter for satellites and subwoofer with adjustable cut-off frequencies.
5. Principle of the digital power amplifier class D and PWM.
6. Digital equalizer and limiter for audio controlled by PC.
7. ADC and DAC for audio with adjustable parameters.
8. Measurements of the DAC of the CD player characteristics using the analyzer Audio Precision.

Work placements

Not applicable.

Aims

The aim of the course is theoretical and practical knowledge of analog and digital audio technique and electronics area.

Specification of controlled education, way of implementation and compensation for absences

The content and forms of instruction in the evaluated course are specified by a regulation issued by the lecturer responsible for the course and updated for every academic year.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Not applicable.

Recommended reading

Not applicable.

Classification of course in study plans

  • Programme EEKR-BC Bachelor's

    branch BC-EST , 2. year of study, summer semester, optional specialized

Type of course unit

 

Lecture

39 hours, optionally

Teacher / Lecturer

prof. Ing. Tomáš Kratochvíl, Ph.D.

Syllabus

Introduction to low-frequency and audio electronic and acoustics fundamentals. Low-frequency transmission description. Microphones and speakers. Low-frequency amplifiers classes. Pre-amplifiers, equalizers, dynamic compression and expansion amplifiers. Analog noise reduction. Power amplifiers (discrete, integrated, digital). Selected methods of analog measurements. Analog record of low-frequency signals (CC). Digital processing in low-frequency and audio electronics. A/D and D/A converters, DSP processing. Digital record of low-frequency signals without data reduction (CD-A, DAT). Data reduction and audio compression (MPEG, ATRAC, PASC). Digital record of low-frequency signals with data reduction (AC-3, DTS, DCC, MD) and high definition formats for audio (SACD, DVD-A). Digital audio broadcasting (T-DAB and DRM).

Fundamentals seminar

13 hours, optionally

Teacher / Lecturer

prof. Ing. Tomáš Kratochvíl, Ph.D.

Syllabus

Practical design of amplifiers noise characteristics, power amplifiers with bipolar and unipolar transistors and integrated circuits.
Desing of the amplifier static characteristics.
Desing of the amplifier dynamic characteristics, theory and application of the feedback.
Control test no. 1.
Utilization of the integrated circuits in low-frequency amplifiers design.
Design of the low-frequency integrated amplifiers.
Design of the low-frequency digital amplifiers.
Control test no. 2.

Laboratory exercise

13 hours, compulsory

Teacher / Lecturer

prof. Ing. Tomáš Kratochvíl, Ph.D.

Syllabus

Measurements of the preamplifier characteristics with linear and RIAA corrections.
Measurements of the passive and active corrector characteristics (equalizer) using PC and sound card.
Measurements of the discrete and integrated power amplifiers characteristics.
Measurements of the digital power amplifier (class T) characteristics.
Measurements of the CD recorder characteristics using the analyzer Audio Precision P1DD.
Measurements of the audio characteristics using analyzer Audio Precision ATS-2.
Compression of digital sound and music.