System for limiting the magnitude of sampled data

Details System for limiting the magnitude of sampled data System for limiting the magnitude of sampled data

1995-03-06

1997-05-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

375296, 327180, H03G 300

Patent

active

056319690

ABSTRACT:
An analog signal is sampled at sampling rates which are low relative to the highest frequency components of the analog signal. The digitized sample signals are processed and amplitude limited in a digital signal processor. Real and imaginary components for each data sample are determined. The magnitude of the complex phasor corresponding to the data sample is calculated using those real and imaginary components. If the calculated magnitude of the complex phasor exceeds a preset limit, then the sample is scaled by a suitable scaling factor, (i.e. the ratio of the preset limit to the actual calculated phasor magnitude) without changing the phase of the input sample. By operating at minimum sampling rates, digital signal processing resources are conserved while still reliably limiting the processed signal.

REFERENCES:
patent: 4701953 (1987-10-01), White
patent: 4839906 (1989-06-01), Leveque et al.
patent: 4882762 (1989-11-01), Waldhauer

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