US4817162A
Expired / Lapsed
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Binaural correlation coefficient correcting apparatus
Assignee: Pioneer Corp
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Filing: 1987-09-21
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Granted: 1989-03-28
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Expires: 2007-09-21
Abstract
Abstract An acoustic apparatus for correcting the binaural correlation coefficient of a stereo audio signals, particularly for use in automobiles. The signal in at least one of the channels is phase shifted in the frequency range of 200 to 600 Hz.
Inventors
- 👤 Hisashi Kihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:59
CPC Classifications
H; H04; H04S; H04S1/00; H04S1/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
An acoustic correction device, comprising: a source of a right and a left channel of an audio signal; and means for separately shifting a phase of at least one of said right and left channels in a predetermined frequency band, wherein said shifting means includes separate signal paths for each of said right and left channels, a first phase shifter in a first one of said signal paths inverting a signal phase at a frequency of substantially 200 Hz and a second phase shifter in a second one of said signal paths inverting a signal phase at a frequency of substantially 600 Hz.
Claim 2
Dependent Claim
103 words
An acoustic correction device, comprising: a source of a right and a left channel of an audio signal; and means for separately shifting a phase of at least one of said right and left channels in a predetermined frequency band, wherein said shifting means includes separate signal paths for each of said right and left channels, a first phase shifter in a first one of said signal paths inverting a signal phase at a frequency of substantially 200 Hz and a second phase shifter in a second one of said signal paths inverting a signal phase at a frequency of substantially 600 Hz.
Claim 3
Dependent Claim
20 words
An acoustic device as recited in claim 1, wherein said predetermined frequency band is approximately 200 Hz to 600 Hz.
Claim 4
Dependent Claim
35 words
An acoustic device as recited in claim 1, wherein said shifting means operates with parameters selected to improve a biaural correlation coefficient of said right and left channels in an environment of said acoustic device.
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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |