Equalization for audio mixing

Details Equalization for audio mixing Equalization for audio mixing

2006-05-02

2006-05-02

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

With mixer

C381S103000, C381S107000

Reexamination Certificate

active

07039204

ABSTRACT:
During mixing of an N-channel input signal to generate an M-channel output signal, the mixed channel signals are equalized (e.g., amplified) to maintain the overall energy/loudness level of the output signal substantially equal to the overall energy/loudness level of the input signal. In one embodiment, the N input channel signals are converted to the frequency domain on a frame-by-frame basis, and the overall spectral loudness of the N-channel input signal is estimated. After mixing the spectral components for the N input channel signals (e.g., using weighted summation), the overall spectral loudness of the resulting M mixed channel signals is also estimated. A frequency-dependent gain factor, which is based on the two loudness estimates, is applied to the spectral components of the M mixed channel signals to generate M equalized mixed channel signals. The M-channel output signal is generated by converting the M equalized mixed channel signals to the time domain.

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“One-Shot Digital Equalization for Nonlinear Modulations”, by Angelo Bernardini et al., Conference Proceedings Article, Mar. 19, 1992, pp. 252-263.
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