System and method for real time sinusoidal signal generation using waveguide resonance oscillators

摘要

Sinusoidal waveforms are synthesized using one or more waveguide resonance oscillators. The waveguide resonance oscillator has two digital delay elements coupled to a digital waveguide junction. Each digital delay element receives a signal on its respective input node and outputs the received signal on its respective output node after a delay of one sample period. In the preferred embodiment, the waveguide junction has three digital signal adders and one signal multiplier interconnected so as to compute, once each sample period, a new input value for each digital delay element as a function of the two signals output by the digital delay elements. The multiplier coefficient used by the waveguide junction's multiplier determines the generated waveform's frequency of oscillation. The two output signals from the waveguide junction are sinusoidal waveforms that are 90 degrees out of phase with each other. When the first multiplier's coefficient value is timing varying, the waveguide resonance oscillator generates a sinusoidal waveform of time varying frequency and a second multiplier is used in the waveguide junction to maintain the sinusoidal waveform at a substantially constant amplitude. By using a first waveguide resonance oscillator to control the multiplier coefficient of a second waveguide resonance oscillator, frequency modulated waveforms are generated by the second waveguide resonance oscillator.