Multipass parametric or graphic EQ fitting

Details Multipass parametric or graphic EQ fitting Multipass parametric or graphic EQ fitting

2005-02-15

2010-02-16

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

C333S02800T

Reexamination Certificate

active

07664276

ABSTRACT:
Multiple passes are executed in the setup of an equalizer, and modification of the equalization is performed after each pass of an analysis phase. After an initial pass, the equalization is adjusted, based upon the location of peaks and valleys in the system response. This initial adjustment of equalization may tend to flatten most of the peaks and valleys to produce the desired uniform linear response. Inexact application of equalization corrections may introduce other artifacts into the system response and/or may not sufficiently normalize equalization. A second pass is then performed to measure the system response using the new equalization settings. The new peaks and valleys are measured, and the equalization adjusted to try to flatten response further. A proximity range may be applied to each pass, to reduce the likelihood that adjustment of one equalizer coefficient will create artifacts in the resulting system response.

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