Abstract: An equalizer circuit having a medium and high frequency correction circuits having a characteristics that a phase of an input aural signal advances as a frequency of the aural signal is increased in a higher frequency range than the 1 KHz and a circuit constant which advances a phase of the frequency from about 1 KHz to 5 KHz relatively and a low frequency correction circuit having a characteristic that a phase of the input aural signal is delayed as the frequency of the aural signal is lowered in a lower frequency range than about 1 KHz and a circuit constant having a reverse characteristic to a peak of a resonance frequency of the sound field to be regenerated.

Abstract: A high fidelity regenerative amplifier with a phase correction circuit has a frequency characteristic which is flat over as a wide frequency range as possible and a phase characteristic suitable for a characteristic of the sound field in which regenerated sound is reproduced. In order to achieve such characteristics, an amplifier which amplifies regenerated sound with high fidelity is preceded by a phase correction circuit connected thereto to correct the phase characteristic of the amplifier over a wide frequency range. Such phase correction in accordance with the sound field characteristic can reproduce sound very near to natural sound regardless of the sound field.