Digital noise generator

Details Digital noise generator Digital noise generator

1985-12-23

1987-06-16

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

331 78, 364717, G01R 1900

Patent

active

046738711

ABSTRACT:
A digital noise generator for use in aeroengine noise testing can accurately and repeatably reproduce a standard noise spectrum so that differing noise analysis systems can be calibrated to a common standard. The noise generator comprises a pseudo-random binary sequence generator which is fed with a low clock frequency derived from a high frequency crystal oscillator. The generator produces a pseudo-random noise single bit signal which is fed to the most significant bit input of a digital to analogue converter, whose other inputs are fed with simulated tone data residing within an EPROM, the pseudo-random and tone noise thereby being digitally summed before conversion to an output analogue signal of desired spectral characteristics.

REFERENCES:
patent: 4270430 (1981-06-01), Deutsch
patent: 4306113 (1981-12-01), Morton
patent: 4375620 (1983-03-01), Singer et al.

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