Frequency sweeping audio signal device
AssigneeYosemite Investment, Inc.
InventorsGeorge Alan Burnett, Robert Lyle Leonard, Jr.
Life of this patent
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Abstract
An audio signal is generated that sweeps from a lower frequency to a higher frequency in a substantially linear function. The circuit used to produce this sweeping audio frequency has a stable power supply, a square wave oscillator, a ramp generator, a voltage controlled oscillator, a drive circuit and an audio circuit. The square wave generator is composed of logic gates that generate a square wave with near instantaneous rising and falling edges. The ramp generator creates a sweep drive signal that is a substantially linear triangular waveform.
Claims13
A frequency sweeping audio signaling device, comprising:
- (a) a voltage regulator for providing a stable voltage source to the frequency sweeping audio signaling device;
- (b) a square wave oscillator connected to the stable voltage source that generates a sweep rate signal;
- (c) a ramp generator receiving the sweep rate signal from the square wave oscillator and generating a sweep drive signal that is a substantially linear triangular waveform;
- (d) a voltage controlled oscillator receiving the sweep drive signal from the ramp generator to generate a frequency sweep signal that makes an excursion rising in frequency and then falling in frequency in a substantially linear sweep;
- (e) a drive circuit receiving the frequency sweep signal and generating an output frequency sweep signal that has a higher amplitude than the frequency sweep signal;
- (f) an audio generator receiving the output frequency sweep signal and generating an audio frequency sweep signal that sweeps from a lower frequency to a higher frequency and back to a lower frequency in a substantially linear function;
- and
- (g) a logic gate buffer placed between the square wave oscillator and the ramp generator to reduce distortion of the square drive signal.
A method for generating a frequency sweeping audio signal, comprising the steps of:
- (a) providing a stable voltage source with a voltage regulator;
- (b) generating a sweep rate signal with a square wave oscillator connected to the stable voltage source;
- (c) generating a sweep drive signal that is a substantially linear triangular waveform with a ramp generator that receives the sweep rate signal from the square wave oscillator;
- (d) generating a frequency sweep signal with a voltage controlled oscillator that receives the sweep drive signal from the ramp generator to generate the frequency sweep signal that makes an excursion rising in frequency and then falling in frequency in a substantially linear sweep;
- (e) driving the frequency sweeping signal with a drive circuit to produce an output frequency sweeping signal that has a higher amplitude than the frequency sweeping signal;
- (f) generating a rising and falling audio tone that sweeps from a lower frequency to a higher frequency and back to a lower frequency in a substantially linear function by driving an audio generator with the output frequency sweeping signal;
- and
- (g) reducing distortion of the square drive signal by buffering the signal through a logic gate between the square wave oscillator and the ramp generator.
Dependencies are inferred from the claim text.