FREQUENCY SYNTHESIZER

Abstract

A frequency synthesizer for use by an operator or other means for continuously generating an output noise signal, the frequency synthesizer comprises a digital means for directly synthesizing random noise having controlled spectral amplitudes. The synthesized random noise is characterized by a series of digital composite frequency synthesizer output noise signal sample values. The digital means comprises a means for providing and for periodically changing a series of sets of shifted segment frequency values, each set of shifted segment frequency values having a controlled series of random frequency values. Each frequency value is a random digital number selected to be within a range corresponding to a segment frequency band and characterizes a shifted segment frequency value. A plurality of digital oscillators is included, each oscillator having a corresponding segment frequency band. Each oscillator output is a series of digital values that sequentially characterizes a sinusoid having a frequency that equals the shifted segment frequency of the respective frequency band. A means for sequentially sampling the output amplitude of each oscillator and for combining each sampled oscillator output value with a corresponding predetermined frequency segment gain value to obtain a corresponding set of segment gain scaled sample values. A means for summing each segment gains scaled sample value within the set to obtain a composite frequency synthesizer output noise signal sample value is included along with a means with for forming a continuous output signal from a series of the composite frequency synthesizer output noise signal sample values.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1THOMAS A. BECKER

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