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How to Calculate Interpolated BP

Bandpass, or bp, is a digital audio engineering term describing a two-part filter that cuts high frequencies using acoustic cancellation and low frequencies on bass response through natural physical limitations. Normally, the audio editing software handles the calculation for interpolated bp, but you can manually calculate the required filter settings, if desired.

Instructions

    • 1

      Choose the bandpass menu option in your audio editing software. Although the location of this menu varies depending on which program you use, all professional audio editing software programs offer the option, such as Band-in-a-Box, Cubase, ProTools.

    • 2

      Select the create filter option. This opens a dialog box of settings. Some software programs will provide suggested settings based on the current take. If your program does this, you can use its suggested settings to create the filter.

    • 3

      Calculate the interpolated bandpass manually, if your software does not complete the computation for you. The interpolation function is:
      n sinc (nt/T) - (n-1) sinc ( (n-1)t/T), where the lowpass filter impulse response, is sinc (t/T).

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