A new digital frequency modulation using a second-order sinusoidal oscillator

This paper presents a new digital frequency modulation scheme using digital sinusoidal oscillator, By multiplying an information signal with the oscillator coefficient, positions of the system poles are varied according to the strength of the incoming signals. As a result, the frequency modulation is obtained. The advantage of this system is that its frequency deviation and bandwidth are directly defined by the initial frequency condition of the system and are independent of the signal strength. Thus, the signal bandwidth is easily controlled. Computer simulation results are provided to confirm that the proposed system is the frequency modulator.