FIELD: physics.
SUBSTANCE: bandpass filter splits an input signal into a multitude of signals subranges. Characteristic quantity calculation scheme calculates the characteristic value using at least one of many received by dividing signals subranges and input signal. Scoreboard of high frequency power subbands calculates a value cardinality estimation subrange the higher frequencies on the basis of computed intrinsic value. The high-frequency signal generation circuit generates a high-frequency signal component based on a plurality of subband signals allocated by the bandpass filter and a high-frequency subband power estimate value computed by the high-frequency subband power estimate circuit. Expansion unit of frequency range extends the frequency range of the input signal using a high-frequency signal component, developed elaborate scheme of the high-frequency signal.
EFFECT: increasing the sound quality of the audio signal by extending the frequency range.
8 cl, 34 dwg
