198
4 After the Lips: Acoustic Resonances and Radiation
Fig. 4.89 Directivity patterns for (a) a trumpet; (b) (on following page) a french horn Pätynen and
Lokki (2010)
R(ω) = −e
−2jkL .
(4.18)
The reflection coefficient is related to the input impedance through Eq. 4.28, which
can be rearranged to give
Z
(ω) =
1 + R(ω)
1 − R(ω)
,
(4.86)
4 After the Lips: Acoustic Resonances and Radiation
Fig. 4.89 Directivity patterns for (a) a trumpet; (b) (on following page) a french horn Pätynen and
Lokki (2010)
R(ω) = −e
−2jkL .
(4.18)
The reflection coefficient is related to the input impedance through Eq. 4.28, which
can be rearranged to give
Z
(ω) =
1 + R(ω)
1 − R(ω)
,
(4.86)