A Weighted Noise Active Control Method Based on Offline Reconstruction of Secondary Paths
A secondary channel, active control technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of increased hardware cost, increased calculation amount, difficult to guarantee effect, etc., to achieve the effect of improving noise reduction bandwidth and noise reduction.
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[0053] Such as figure 1As shown, this embodiment provides a weighted noise active control method based on secondary channel offline reconstruction, including the following steps:
[0054] 1) Measure the transfer function of the secondary path;
[0055] 2) Determine the evaluation standard for active noise control - the minimum A-weighted sound pressure level;
[0056] 3) Use the sound pressure A-weighting curve to reconstruct the secondary channel offline;
[0057] 4) Apply the reconstructed secondary pathway to the existing active noise control system;
[0058] 5) Re-matching the system parameters to achieve the best effect of weighted noise active control.
[0059] Such as figure 2 Shown is the schematic diagram of the noise active control system of this embodiment, wherein is the secondary path transfer function of this embodiment.
[0060] Step 1) The result of measuring the transfer function of the secondary path is as follows Figure 5 shown by the solid line. ...
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