Patent ID: 6417659
Filing Date: 2002-07-09
Classification: H04R

Abstract:
An electronic self-tuning circuit physically coupled to a vibratory transducer, vibratory transducer having a resonance frequency and operable to produce a waveform having rising and falling edges, the electronic self-tuning circuit being operable to determine the resonance frequency, the electronic self-tuning circuit comprising:a connector for connecting with a power supply operable to provide a voltage which intermittently may undesirably increase or decrease in magnitude; negative feedback circuitry operable to prevent the vibratory transducer from increasing in loudness as the power supply voltage increases; transducer connection circuitry operable to provide a physical connection between the electronic self-tuning circuit and the vibratory transducer; comparator circuitry operable to compare the rising and falling edges of the waveform and to assign a value indicative of the results of the comparison; and controller circuitry operable to produce a signal having a frequency and further operable to adjust the frequency in response to the value assigned by the comparator circuitry.