803Chapter 24
Delay
by Steven McManus
24.1 Delay................................................................................. 805
24.1.1 Comb Filter......................................................................... 805
24.1.2 Directional Perception................................................................. 805
24.2 Uses of Delay.......................................................................... 806
24.2.1 Delay in Loudspeaker Systems.......................................................... 806
24.2.2 Setting Delay Times.................................................................. 807
24.2.3 Reverberation Synthesis............................................................... 808
24.2.4 Delay-Based Effects.................................................................. 809
24.3 Implementations........................................................................ 809
24.3.1 Small Delays........................................................................ 809
24.3.2 Acoustic Delay Methods............................................................... 809
24.3.3 Tape Delay.......................................................................... 810
24.3.4 Analog Shift Register Delays........................................................... 810
24.3.5 Digital Delays....................................................................... 810
24.4 Sampling in time........................................................................ 811
24.4.1 Aliasing............................................................................ 811
24.4.2 Capturing a Sample................................................................... 812
24.4.3 Errors in Sampling Magnitude.......................................................... 812
24.5 Analog-to-Digital Conversion.............................................................. 813
24.5.1 Pulsed Code Modulation............................................................... 813
24.5.2 Delta Modulation..................................................................... 813
24.5.3 Sigma-Delta Modulation............................................................... 814
24.5.4 Decimation......................................................................... 814
References................................................................................. 815