Patent · US Active

FFT bin based signal limiting

US9210506B1 · kind B1 · utility

20Cited by

2References

5Claims

0Family size

Assignee

Audyssey Laboratories, Inc. · US

Inventors

Ismael H. Nawfal · Redondo Beach, US
Ramasamy Govindaraju Balamurali · Los Angeles, US

Key dates

Filing date	Sep 12, 2011
Grant date	Dec 8, 2015
Priority date	—
Expiry date	Oct 8, 2034

Classification

Technology area (CPC H)Electricity
CPC primaryH04R2430/03
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Volume extension includes limiting the magnitude of Fast Fourier Transform (FFT) frequency bins which allows increases to the perceived level of audio content without causing distortion. A soft limit and smoothing is applied to each FFT bin is to prevent or reduce distortion while maximizing output volume. Frequency resolution is significantly improved compared to volume extension methods utilizing filterbanks and hard limiting, and distortion is reduced because no hard limiting occurs.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.