Acoustic Measurements

1. Introduction.

Interesting Tasks of the Past Twenty Years.

Examples of Acoustic Measuring Techniques.

Visualization of the Sound Field.

Acoustic Measurement of Grinding Wheels.

Acoustic Impedance and Admittance Meter.

2. Signal Generators

Analog Heterodyne Audio Frequency Generators.

Digital Frequency Synthesizer. The IEC Bus.

Spectral Power Density of White and Pink Noise.

3. Sound Generators.

Artificial Voice, Mouth Simulator.

Reference and Power Sound Sources.

Sound Power Measurement.

Substitution and Juxtaposition Method.

4. Mechanical Generators.

Vibration Exciters, Shakers.

Tapping Machine. Impact Hammer.

Shock Equipment

5. Accelerometers.

Types, Equivalent Circuit, Main Parameters.

Mounting Techniques, Signal Conditioning.

6. Other Electromechanical Transducers

Force Transducer. Impedance Head.

Velocity and Displacement Sensors.

Structure. Equivalent Circuit. Parameters.

7. Sound Receivers.

Condenser Microphones. Artificial Ear. Calibration.

8. Special Measuring Equipment.

Stroboscope. Turntable.

Phase Meter. Delay Unit.

Level Recorder.

9. Standing Wave Meter.

Sound Reflection and Absorption. Acoustic Impedance. Smith Diagram.

10. Frequency Range and Level of Acoustic Measurements.

Octave and Terc, dBV, dBm, dBu and dBr.

11. Sound Level Meters.

Measured Quantities (L_eq, SEL, fast/slow/peak hold). Weighting (A, B, C, D) Filters.

12. Measurements on Telephone Sets.

Signaling Circuit. Loudness, Sensitivity.

Telephone Transmission Quality.

Subjective Voice-Ear Measurements. The NOSFER System.

Objective Measurements. The OREM Method.

13. ISO Standard and Recomendation-Based Measurements.

Vehicle Noise.

Reverberation Time.

Sound Absorption. Sound Insulation.