CONCLUSIONS

The WD tonehole model uses only two multiplications per sample (one for the three-port scattering and one for the reflectance filter). Similar to the three-port tonehole model presented in [9], the model allows dynamic control of the tonehole state and closely approximates the established theories on tonehole acoustics. The advantages of the WD model are that 1) there is no minimum tonehole length, which allows simulation of toneholes of particular small dimensions and 2) no fractional delay filters are required for implementation of fractional delay tonehole lengths.