Bass amplifier with high frequency response

Details Bass amplifier with high frequency response Bass amplifier with high frequency response

1987-03-02

1989-01-10

Isen, Forester W.

Electrical audio signal processing systems and devices

Loudspeaker feedback

381 98, 330105, 330126, 333 28T, H04R 300

Patent

active

047979330

ABSTRACT:
A method of improving the frequency reproduction at frequencies higher than a certain break frequency (fs) of a bass amplifier known per se within the audio frequency range. The amplifier has a low-pass filter portion (ACE1) and a power amplifier portion (EF) with a current feedback portion (ACE2) in order to get a negative output impedance against the loudspeaker. According to the invention high-pass filtration is carried out from the break frequency (fs) and upwards to about 20 kHz of the signal coming to the amplifier and thereafter a phase shift (.rho.) is carried out so that a cophasal state is obtained at the break frequency (fs) before the power amplifier portion (EF).

REFERENCES:
patent: 4118600 (1978-10-01), Stahl
patent: 4223273 (1980-09-01), Yokoyama
patent: 4260954 (1981-04-01), Crooks
patent: 4426552 (1984-01-01), Cowans et al.

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