Controlled oscillator having random variable frequency
First Claim
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1. Apparatus for generating an oscillatory output signal, comprising:
- an oscillator having means associated therewith for controlling and varying the frequency of said oscillatory output signal in response to variations of an oscillator input control signal; and
means for generating said oscillator input control signal, comprising;
a binary random number generator generating a sequence of pulses, V1, having a constant magnitude and randomly varying polarity;
means for operating on V1 according to the algorithm ##EQU11## wherein n is a positive interger; and
means for scaling the magnitude of Vn+1 to form said oscillator input control signal.
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Abstract
Method and apparatus for varying the output signal frequency of a controlled oscillator. The oscillator control signal is formed by filtering the output of a random number generator in such a way that the oscillatory output signal has a random frequency walk phase characteristic having predetermined, controlled characteristics.
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Citations
11 Claims
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1. Apparatus for generating an oscillatory output signal, comprising:
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an oscillator having means associated therewith for controlling and varying the frequency of said oscillatory output signal in response to variations of an oscillator input control signal; and means for generating said oscillator input control signal, comprising; a binary random number generator generating a sequence of pulses, V1, having a constant magnitude and randomly varying polarity; means for operating on V1 according to the algorithm ##EQU11## wherein n is a positive interger; and
means for scaling the magnitude of Vn+1 to form said oscillator input control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of generating a control signal for an oscillator having a controllably variable output signal frequency, comprising the steps of:
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selecting n for a random frequency walk having a 1/f2n noise spectrum, wherein n is a positive integer; generating a sequence of pulses, V1, having a constant magnitude and randomly varying polarity, wherein said pulses are generated at a preselected repetition rate of 1/T per second; providing a filter having a weighted shift register and adder structure, said filter operating on V1 according to the algorithm ##EQU12## wherein N is a preselected positive number and e-sNT represents a time delay of NT seconds; and scaling the magnitude of Vn+1 to form an input control signal for said oscillator, wherein a unit change in the value of Vn+1 changes said input control signal by an amount which varies the frequency of said oscillatory output signal by K radians per second, wherein K is a preselected positive number. - View Dependent Claims (11)
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Specification