Patent US5263086A successfully refreshed from Google Patents.
US5263086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio accessory circuit
Assignee: Sony Corp
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Filing: 1991-05-31
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Granted: 1993-11-16
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Expires: 2011-05-31
Abstract
Abstract The gain of the frequency components in a given band of the difference signal between stereophonic input L and R channel signals is desirably changed and is added to the input L and R channel signals and the gains of the components of the difference signal in high and low frequency bands are desirably changed so that massive stereophonic reproduced sound having presence can be obtained by a simple and inexpensive structure.
Inventors
- 👤 Daisuke Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:32
CPC Classifications
H; H04; H04S; H04S1/00; H04S1/002; H04S5/00; H04S1/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
An audio accessory circuit, consisting essentially of subtracting means for outputting the difference signal between stereophonic input L and R channel signals; variable gain high pass filter means for passing only frequency components of a given band from the output of said subtracting means and for desirably changing the gain of the frequency components to be passed; and adding means for adding the output of the variable gain high pass filter means to the signals of the input L and R channels.
Claim 2
Dependent Claim
82 words
An audio accessory circuit, consisting essentially of subtracting means for outputting the difference signal between stereophonic input L and R channel signals; variable gain high pass filter means for passing only frequency components of a given band from the output of said subtracting means and for desirably changing the gain of the frequency components to be passed; and adding means for adding the output of the variable gain high pass filter means to the signals of the input L and R channels.
Claim 3
Dependent Claim
20 words
The audio accessory circuit of claim 1 wherein the high pass filter means has a cut-off frequency of 2 kHz.
Claim 4
Dependent Claim
120 words
An audio accessory circuit comprising: subtracting means for outputting the difference signal between stereophonic input L and R channel signals; variable gain high pass filter means for passing only frequency components of a given band from the output of said subtracting means and for desirably changing the gain of the frequency components to be passed; and adding means for adding the output of the variable gain high pass filter means to the signals of the input L and R channels wherein said variable gain high pass filter means is connected in parallel to a variable gain low pass filter means for passing the components in high and low frequency bands, respectively, and desirably changing the gain of the frequency components.
Claim 5
Dependent Claim
120 words
An audio accessory circuit comprising: subtracting means for outputting the difference signal between stereophonic input L and R channel signals; variable gain high pass filter means for passing only frequency components of a given band from the output of said subtracting means and for desirably changing the gain of the frequency components to be passed; and adding means for adding the output of the variable gain high pass filter means to the signals of the input L and R channels wherein said variable gain high pass filter means is connected in parallel to a variable gain low pass filter means for passing the components in high and low frequency bands, respectively, and desirably changing the gain of the frequency components.
Claim 6
Dependent Claim
53 words
An audio accessory circuit as defined in claim 3 in which the signal of one channel is subtracted from the signal of the other channel and the output of said variable gain high pass filter is added to the other channel signal and is added to the one channel signal via an inverter.
Claim 7
Dependent Claim
23 words
The audio accessory circuit of claim 3 wherein the high pass filter means and the low pass filter means can be independently controlled.
Claim 8
Dependent Claim
20 words
The audio accessory circuit of claim 3 wherein the high pass filter means has a cut-off frequency of 2 kHz.
References Cited (Backward Citations)
US4355203A
Cited
US4394536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |