An approach to vibroacoustical signal phase-keeping purification by optimum FIR digital filters design

The machinery´s vibroacoustical signal purification with no distortion is essential for mechanical fault diagnostics. Among the multitude of phase-keeping purifying method, limit-duration impulse response filters have received renewed attention for several reasons. The finite-length filter offers the advantages of stability, exact linear phase and high-speed implementation with the fast Fourier transform. This paper presents an efficient numerical technique for the accelerating optimum (in the Chebyshev sense) FIR digital filters design. Its advantages over other FIR filters (typically the Kaiser windowing technique) are discussed and compared. Upon this basis, the authors apply the technique for the machinery´s vibroacoustical signals phase-keeping purification and get some obviously analytic results that proved its extensively flexible suitability and effectiveness