Audio Electronics

• 26 hrs lectures
• 26 hrs laboratories

The graduate is able to:
- explain principles of analog and digital low-frequency and audio signal transmission
- describe sources and sinks of low-frequency and audio signal
- design appropriate pre-amplifier, correction amplifier, power amplifier of audio filter
- explain principles of sampling, quantization and coding of the sound and audio signals
- explain principles of bit rate compression of the digital sound and audio signals
- characterize system for the record and playback without and with audio compression
- measure parameters of analog and digital audio system or amplifier

Lectures are aimed at presenting the methods and technical means for processing, transmission and archive of the sound and audio signals in the area of digital low-frequency technique and audio electronics.

Students registering for the course should be able to explain the basic principles of analog and digital signal processing and function of the basic semiconductor units and amplifiers of the signal. Generally, the knowledge of the Bachelor's degree level is required.

• TALBOT-SMITH, M. Audio Engineer's Reference Book, Second Edition. Focal press, 1999. ISBN 978-0240516851.

• POHLMAN, K. C. Principles of Digital Audio (Sixth Edition). McGraw-Hill, 2010. ISBN 978-0071663465.
• METZLER, B. Audio Measurement Handbook. Audio Presision, Inc., 1993. Audio Precision document number 0058.0003 r1.

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

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

During the semester, students can obtain up to 30 points for their active work in laboratory. The final exam is awarded by up to 70 points.

Teaching methods include lectures and practical laboratories. Course is taking advantage of e-learning (Moodle) system. Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations.

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