The concept of linear interpolation in spectral compensation

Spectral compensation is usually achieved with equalizers cascaded so as to generate a desired response. In the concept of linear interpolation, a series of points are located along the desired response and linear interpolation provided between adjacent points. This is accomplished with contiguous band-pass filters arranged so as to minimize the effect of filter crossover. The performance limitations depend upon the filter characteristics, crossover ripple, and the type of response to be equalized. This approach to compensation has two advantages. First, automatic control of the spectrum can be achieved when the input signal is a random noise voltage. Second, discreet points on the frequency axis permit control using digital techniques. Data is presented for some cases of peak-notch resonances encountered in acoustic and vibration systems.