Applications of Bandlimited Interpolation

Bandlimited Interpolation is used in (e.g.)

• Sampling-rate conversion
• Oversampling D/A converters
• Wavetable/sampling synthesis
• Virtual analog synthesis
• Fractional delay filtering

Fractional delay filtering is a special case of bandlimited interpolation:

• Fractional delay filters only need sequential access $\Rightarrow$ IIR filters can be used
• General bandlimited-interpolation requires random access $\Rightarrow$ FIR filters normally used

Fractional Delay Filters are used for (among other things)

• Time-varying delay lines (flanging, chorus, leslie)
• Tuning digital waveguide models to correct pitch
• Exact tonehole placement in woodwind models
• Beam steering of microphone / speaker arrays