Removals of noise in SP record reproduction were attempted utilizing GHA (Generalized Harmonic Analysis) as Inharmonic frequency analysis. Spectrum subtraction is most common among conventional noise reduction techniques, however it has a side effect of musical noise generation. It is caused by inaccurate frequency resolution inherent to conventional Harmonic frequency analysis. One of inharmonic frequency analysis of GHA is equipped with excellent frequency resolution, and has been put in practical use recently. The authors applied GHA for noise reduction and obtained better results than those by conventional Spectrum subtraction. However there still remained musical noise problems and its major reason is spectral in-coincidence between pre-sampled reference noise and actually remained residual noise. The authors tried several countermeasures such as pre-spectral shaping of object signal and spectral similarity calculation of residual noise etc. Through combining countermeasures, the authors achieved satisfactory noise reduction.
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