Multi-band, digital audio noise filter

Details Multi-band, digital audio noise filter Multi-band, digital audio noise filter

1993-02-12

1995-05-16

Isen, Forester W.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 98, H04B 1500

Patent

active

054168473

ABSTRACT:
This disclosure provides a multi-band, digital audio noise filter that is especially useful in the restoration of motion picture film soundtracks. More particularly, the preferred embodiment presented herein utilizes a remote fader board having eight faders which permit a user to control thresholds for sixty-four frequency bins. These faders are monitored by a MOTOROLA 56000-series microprocessor, which accepts digitized audio input signals, performs a Fast Fourier Transform upon a 128 sample window to yield signal contribution for each of the sixty-four frequency bins, and derives FIR filter coefficients for noise attenuation. The digitized audio input signals, which have been stored in a circular input buffer, are convolved with the FIR filter and output as the digitized output signals of the restored motion picture soundtrack.

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