ECE Course Outline


Audio Engineering Laboratory (0-3-1)

ECE 4445** Prerequisites indicated with an asterisk may be taken concurrently with ECE4446
Catalog Description
A companion laboratory to ECE 4445. Design, analysis, construction, modeling, and testing of circuits and systems pertaining to audio engineering.
No Textbook Specified.
Course Objectives - As part of this course, students:

  1. design, analyze, simulate, implement, and evaluate electrical, mechanical, and acoustical circuits and systems. [b,c]
  2. use engineering techniques, skills, and tools, including software-based methods. [k]
  3. develop basic skills in writing laboratory reports and other documentation. [g]
Course Outcomes - Upon successful completion of this course, students should be able to:

  1. design and implement circuits and systems related to sound generation and modification.
  2. develop evaluation methods for these circuits and systems and interpret the resulting data.
  3. write laboratory reports and documentation conforming to technical writing standards.
  4. identify components of a complex impedance from measured data.
  5. determine equivalent circuit models for various acoustical, mechanical, and electrical systems from measured data.
  6. use circuit models to make predictions about systems containing the modeled components.
  7. use laboratory instrumentation to measure data generated by various structures/systems/circuits.
  8. relate time domain, frequency domain, and audible characteristics of signals.
  9. identify non-ideal characteristics of passive circuit elements.
Topical Outline
Time, frequency, and audible characteristics of fundamental signals. SPL measurements. Introduction to real time analyzer and dynamic signal analyzer. Passive filters.

Derivaton of circuit model of unknown impedance from measured data. Predictions of circuit behavior from model. Resonance. Comparison to theoretical. Non-ideal characteristics of circuit elements. Techniques for accurate data collection.

The plane wave tube. Acoustic input impedance measurement. Derivation of passive circuit model for open and closed ended tube. Determination of model limitations. Comparison of measured and modeled responses. Standing waves.

Modeling a mechanical system as an electrical circuit. Derivation of model. Comparison to measurements.

Loudspeaker cabinets. Characteristics of different cabinets. Helmholtz resonance. Effect of cabinet volume on frequency response.

Analog circuits for sound manipulation and generation. Speech scrambler, pink noise generator, filters, oscillators, loudness control, compressor/expander, etc.

Crossover networks. Design and measurement. Driver interaction. Phase considerations. Zobel networks.

Audio power amplifier fundamentals. VBE multiplier, push-pull output stage, crossover distortion, gain bandwidth product, amplifier classes, slewing, THD, etc.