Acoustic replay device

Details Acoustic replay device Acoustic replay device

1997-11-20

1999-09-14

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

381 58, 381 59, H03G 500

Patent

active

059534311

ABSTRACT:
To avoid degradation of the acoustic signal radiated from the opening of the ducted horn of a ducted horn type speaker, under influence of the ducted horn, below the characteristic of the speaker itself, and input terminal for receiving an audio signal, a non-recursive digital filter for varying the input audio signal, a power amplifier for amplifying the varied signal, and speaker for replaying the amplified signal are provided. The non-recursive digital filter realizes the inverse characteristic of the transfer characteristic of the ducted horn.

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patent: 4206831 (1980-06-01), Welch et al.
patent: 4586417 (1986-05-01), Kato et al.
patent: 4888811 (1989-12-01), Takashi
patent: 4972489 (1990-11-01), Oki et al.
patent: 5033086 (1991-07-01), Fidi
patent: 5422955 (1995-06-01), Guzman et al.
patent: 5481615 (1996-01-01), Eatwell et al.
patent: 5511129 (1996-04-01), Craven et al.
Kasuga, "AV and OA digital signal processing", p. 63, published Apr. 25, 1991 by Shobundo.

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