Eigenvalues in the Undamped Case
When , the eigenvalues reduce to
where denotes the angular advance per sample of the oscillator. Since corresponds to the range , we see that in this range can produce oscillation at any digital frequency.
For , the eigenvalues are real, corresponding to exponential growth and/or decay. (The values were excluded above in deriving Eq.(C.144).)
In summary, the coefficient in the digital waveguide oscillator () and the frequency of sinusoidal oscillation is simply
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