Musical Acoustics Experimental Apparatus

Chapter 2: Impulsive Sounds, Alone and in Sequence

Experimental Goals

Observe constant perceived rate for different sounds regardless of offset
Notice rate doubling perception when identical sounds are offset ~50% of period
Identify transitions: individual pulses → buzz → tone (as frequency increases)
Measure critical frequencies and offset ranges using the tools below

1. Single Pulse Generation

Wood Sound (Type 1)

Simulates striking wood - warm, dampened attack

Metal Sound (Type 2)

Simulates striking metal - bright, resonant attack

2. Delayed Dual Pulses

Delay Control

Delay Between Pulses (ms)

100 ms

Dual Pulse Triggers

Test perception with same vs different pulse types

3. Repeating Pulse Sequences

Timing Controls

Tick Rate (BPM)

120 BPM (2.0 Hz)

Offset (% of period)

25% (150 ms)

Sequence Controls

Explore rhythm perception and frequency transitions

Pulse Visualization