H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/30, 330/34
H03F 1/14 (2006.01) H03F 1/08 (2006.01) H03F 1/34 (2006.01)
Patent
CA 2005228
ABSTRACT OF THE DISCLOSURE A high fidelity regenerative amplifier with a phase correction circuit has a frequency characteristic which is flat over as wide a 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 characteristic, 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. The phase correction circuit includes an equalizer having medium frequency and high frequency correction circuits having a characteristic such that a phase of an input aural signal advances as a frequency of the aural signal is high in a higher frequency range than the vicinity of 1KHz. A circuit constant is provided whch advances a phase of the frequency from 1KHz to 5KHz relatively in order to attain far and near feeling. A resistor and a condenser are connected in parallel or series. A low frequency correction circuit is provided having a characteristic that a phase of the input aural signal is delayed as a frequency of the aural signal is low in a lower frequency range than 1KHz. A second circuit constant is provided which has a reverse characteristic to a peak of a resonance frequency of the sound field to be regenerated. A second resistor and a second condenser are connected in parallel or series. The medium, high and low frequency correction circuits are connected to one another. Such phase correction in accordance with the sound field characteristic can reproduce sound very near to natural sound regardless of the sound field.
Borden Ladner Gervais Llp
Ohkuma Saburoh
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