Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent
1990-10-16
1993-05-11
Ng, Jin F.
Electrical audio signal processing systems and devices
Including frequency control
Having automatic equalizer circuit
381102, 381 24, 333 28T, H03G 500
Patent
active
052108066
ABSTRACT:
Disclosed herein is a digital audio signal processing apparatus of a type wherein a graphic equalizer including a plurality of filters connected in series to one another is subjected to arithmetic operation processing to be defined to thereby output the result of its processing as data therefrom. When a change-over command is generated, one filter out of the plurality of filters except for filters positioned at both ends is supplied to one of two output terminals with output data of a filter immediately before said one filter, the stored data is applied to the input of a filter immediately after said one filter and output data of a final filter is applied to the other of said two output terminals so as to define two graphic equalizers. Thus, where it is desired to carry out a change in the mode from arithmetic operation processing which defines a graphic equalizer comprising a plurality of bands to arithmetic operation processing which defines two-separated graphic equalizers comprising a plurality of bands or to the contrary, where it is desired to carry out a change in the mode contrary to the mode referred to above, the change in the arithmetic operation processing can be completed in a relatively short time.
REFERENCES:
patent: 4661982 (1987-04-01), Kitazato et al.
Radio Shack 1992 Catalog, p. 59.
Design Aspects of Graphic Equalizers, R. A. Greiner and Michael Schoenon, Jun. 83, J. Audio Eng. Soc., vol. 31, No. 6.
Kato Shinjiro
Kihara Hisashi
Mori Shuichi
Tamura Fumio
Ng Jin F.
Pioneer Electronic Corporation
Tong Nina
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