Audio mixing using magnitude equalization

Details Audio mixing using magnitude equalization Audio mixing using magnitude equalization

2004-05-25

2009-12-29

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

With mixer

C381S017000, C381S018000, C381S107000

Reexamination Certificate

active

07639823

ABSTRACT:
According to one embodiment, during mixing of an N-channel input signal to generate an M-channel output signal, in at least one frequency sub-band, magnitude equalization is applied to the mixed channel signals such that an amplitude sum magnitude for the N input channels (e.g., the magnitude of a sum of estimated amplitudes of the N input channels) is approximately equal to an amplitude sum magnitude for the M output channels (e.g., the magnitude of a sum of estimated amplitudes of the M output channels). In one implementation, magnitude equalization is applied to one or more sub-bands (e.g., those below 1 kHz), and power equalization is applied to one or more other sub-bands (e.g., those above 1 kHz) to reduce coloration effects in the output signal.

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patent: 2004/0032960 (2004-02-01), Griesinger
“A New Digital Surround Processing System for General A/V Sources”, by Yeongha Choi et al., IEEE Transactions on Consumer Electronics, New York, vol. 41, No. 4, Nov. 1, 1995, pp. 1174-1180, XP000553496.
“One-Shot Digital Equalization for Nonlinear Modulations”, by Angelo Bernardini et al., Conference Proceedings Article, Mar. 19, 1992, pp. 252-263.
“DSP-Implementation of a Multiband Loudness Correction Hearing Aid”, by Thomas Fröhlich et al., Proceedings of the Annual International Conference of the IEEE Orlando, Florida, Oct. 3-Nov. 31, 1991, pp. 1889-1890.
“Audio Coder Enhancement Using Scalable Binaural Cue Coding With Equalized Mixing”, by Rank Baumgarte et al., Audio Engineering Society Convention Papers, New York, pp. 1-9, May 8-11, 2004.

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