Abstract: A frequency interpolating device for restoring a signal similar to the original signal by creating a suppressed frequency component of a specific frequency band of the original signal, approximately from the input signal having the suppressed frequency component. In the frequency interpolating device, when the suppressed frequency component is artificially created from the input signal and added to the input signal, the additional level is set dynamically and adaptively on the basis of the spectrum pattern of the remaining frequency component of the input signal. This setting of the addition level is done by searching a look-up table which stores data that causes a plurality of reference frequency spectrum patterns to be associated with predetermined addition levels. Moreover, the data stored in the table is created on the basis of the results of either an aural test on a plurality of signal sample sounds or a physical frequency analysis on the massive signal data.

Abstract: A frequency interpolating device for restoring a signal similar to the original signal by creating a suppressed frequency component of a specific frequency band of the original signal, approximately from the input signal having the suppressed frequency component. In the frequency interpolating device, when the suppressed frequency component is artificially created from the input signal and added to the input signal, the additional level is set dynamically and adaptively on the basis of the spectrum pattern of the remaining frequency component of the input signal. This setting of the addition level is done by searching a look-up table which stores data that causes a plurality of reference frequency spectrum patterns to be associated with predetermined addition levels. Moreover, the data stored in the table is created on the basis of the results of either an aural test on a plurality of signal sample sounds or a physical frequency analysis on the massive signal data.