Bridge Reflectance
The bridge reflectance is needed as part of the loop filter in a digital waveguide model (Chapter 6).
As derived in §C.11.1, the force-wave reflectance of seen on the string is
where denotes the wave impedance of the ideal string, and denotes the resonance frequency in radians per second. The velocity reflectance is simply minus the force reflectance (§C.11.1).
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