The Frequency Modulation Spectrum of an Exponential Voltage-Controlled Oscillator
As the amplitude of a modulating voltage to an exponential VCO is increased, the pitch of the modulated signal arises, making dynamic depth FM unrealistic. The pitch rise is proportional to I/o, the first of the modified Bessel functions. Higher order terms involving additional modified Bessel functions can be used to compute the entire spectrum. Various methods of correcting for the pitch shift are possible, but the most useful solution to the dynamic depth FM problem with exponential VCO's is to add some form of auxiliary linear control.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members, $5 for AES members and is free for E-Library subscribers.