US4903307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio apparatus having electronic graphic equalizer
Assignee: Hitachi Ltd
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Filing: 1989-06-14
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Granted: 1990-02-20
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Expires: 2009-06-14
Abstract
Abstract An audio apparatus includes an electronic graphic equalizer, in which a plurality of frequency characteristics corresponding to various space configurations are stored preliminarily and a plurality of frequency characteristics corresponding to various types of music are also stored preliminarily. Suitable frequency characteristics are selected from these two groups of frequency characteristics according to a specific spatial configuration and a specific music to be reproduced and combined to obtain a frequency characteristics suitable for the configuration and the music.
Inventors
- 👤 Hiroshi Ozawa
- 👤 Shiro Horii
- 👤 Ichiro Hondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:27
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
An audio apparatus having an electronic graphic equalizer capable of arbitrarily controlling gains in respective frequency ranges within an audible frequency range, first memory means for storing frequency characteristics curves for respective types of car room configuration, second memory means for storing frequency characteristics curves for respective sound sources, first selection means for selecting one of frequency characteristics curves stored in said first memory means, a second selection means for selecting one of frequency characteristics curves stored in said second memory means, and means for adding the two frequency characteristics read out from said first and said second memory means to obtain a composite frequency characteristic, whereby a frequency characteristic suitable for a specific sound source to be reproduced in a specific car room is obtained.
Claim 2
Dependent Claim
126 words
An audio apparatus having an electronic graphic equalizer capable of arbitrarily controlling gains in respective frequency ranges within an audible frequency range, first memory means for storing frequency characteristics curves for respective types of car room configuration, second memory means for storing frequency characteristics curves for respective sound sources, first selection means for selecting one of frequency characteristics curves stored in said first memory means, a second selection means for selecting one of frequency characteristics curves stored in said second memory means, and means for adding the two frequency characteristics read out from said first and said second memory means to obtain a composite frequency characteristic, whereby a frequency characteristic suitable for a specific sound source to be reproduced in a specific car room is obtained.
Claim 3
Dependent Claim
41 words
The audio apparatus as claimed in claim 1, wherein each of said first selection means and said second selection means includes a push button switch and an address counter to be incremented by an operation of the respective push button switch.
Claim 4
Dependent Claim
23 words
The audio apparatus as claimed in claim 2, further comprising a serial communication portion for transmitting said composite frequency characteristic to said equalizer.
Claim 5
Dependent Claim
19 words
The audio apparatus as claimed in claim 3, further comprising a display portion for displaying said composite frequency characteristic.
Claim 6
Dependent Claim
85 words
The audio apparatus as claimed in claim 3, further comprising third selection means responsive to an output of either of said first or said second selection means for selectively outputtting either of said frequency characteristics selected by said first and said second selection means, delay means for delaying said output of said either first or second selection means for a predetermined time and fourth selection means responsive to an output of said delay means for allowing said composite frequency characteristic to pass to said equalizer.
Claim 7
Dependent Claim
44 words
The audio apparatus as claimed in claims 3, wherein at least said first and second selection means, said first and second memory means, said means for adding, said serial communication portion, and a control means for said display portion are constituted with a microcomputer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |