Patent ID: 7805293

Claim:
A band correcting apparatus, comprising: a corrector receiving an input signal that is limited in a frequency band for correcting the input signal with a gain to output a corrected signal, the gain being lower in a limited band and higher outside the limited band; a monitor for monitoring whether or not a signal level of the corrected signal falls between preset maximum and minimum values to output level information; and a level adjustor for adjusting a signal level of the input signal responsive to the level information from said monitor, wherein said level adjustor includes a coefficient controller responsive to the level information for controlling a coefficient defining the gain, and wherein said corrector comprises a first filter for amplifying a band signal, excluding the input signal that is limited in a frequency band, and a second filter for applying a delay to a signal of the band excluding the limit band of the band-limited input signal, the delay being substantially equivalent to a delay of the band-limited input signal; wherein said monitor and said level adjustor are provided correspondingly in number to the band signal of the first filter; wherein said level adjustor includes a coefficient controller and a multiplier for multiplying the coefficient from said coefficient controller with the input signal; and wherein said apparatus further comprising an adder for summing an output of said first and second filter.