H - Electricity – 03 – G
Patent
H - Electricity
03
G
H03G 9/12 (2006.01) H03G 5/02 (2006.01) H03H 11/18 (2006.01) H03H 11/40 (2006.01) H04S 1/00 (2006.01)
Patent
CA 2049641
The present invention relates to an acoustic circuit for correcting a sound field characteristic. A frequency characteristic of regenerated sound is made flat over as a wide frequency range as possible and a phase characteristic is adapted to match the characteristic of the sound field in which regenerated sound is obtained by eliminating phase distortion so that the regenerated sound is brought close to natural sound extremely. The present invention realizing such characteristics includes an equalizer circuit having a medium frequency and high frequency correction circuits having a characteristic 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 vicinity of 1 KHz and a circuit constant which advances a phase of the frequency from about 1 KHz to 5 KHz relatively in order to attain far and near feeling, 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, the medium, high and low frequency correction circuits being connected one another. Further, the present invention includes a high fidelity regenerative amplifier provided with the equalizer circuit connected to a phase correction circuit for correcting a phase characteristic of an amplifier circuit for amplifying regenerated sound with high fidelity over a wide frequency range and an acoustic characteristic correction circuit in the high fidelity regenerative amplifier having an impedance conversion circuit connected to the equalizer circuit to convert an impedance of the equalizer circuit to a proper value.
Borden Ladner Gervais Llp
Ohkuma Saburoh
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