Patent US3980827A successfully refreshed from Google Patents.
US3980827A
Expired / Lapsed
US
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Diversity system for noise-masking
Assignee: Individual
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Filing: 1974-12-19
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Granted: 1976-09-14
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Expires: 1994-12-19
Abstract
Abstract Masking-noise speakers are positioned in an array of lines and rows to direct masking noise into a space. Two separate noise generators provide noise signals respectively to two equalizer-amplifiers which provide their signals respectively to first and second narrow band equalizers. These channel signals are respectively delivered through power amplifiers to first and second sets of speakers in the speaker array. The first and second channel signals are combined to produce a third channel signal, are power amplified, and delivered to a third set of speakers in the array so that no two adjacent speakers on any line or row are powered by the same noise signal. In a modified arrangement, the combination of the first and second channel signals is made after power amplification.
Inventors
- 👤 Ludwig W. Sepmeyer
- 👤 John P. Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:04
CPC Classifications
H; H04; H04R; H04R27/00; G; G10; G10K; G10K11/00; G10K11/16; G10K11/175; G10K11/1752; H04K; H04K3/00; H04K3/40; H04K3/42; H04K3/80; H04K3/82; H04K3/825; H04K2203/00; H04K2203/10; H04K2203/12; H04K3/43
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
A system for noise-masking having a noise generation and masking system consisting of: first and second noise generators for producing random noise; first and second narrow band equalizers respectively connected to the outputs of said first and second noise generators for producing electronic signals equivalent to equalized audio-noise in first and second channels; and means connected to both said first and second channels for receiving and combining signals from said first and second channels to produce a third channel of electronic signal corresponding to equalized audio-noise, said electronic signals of said first, second and third channels being for controlling speakers for directing non-localizable masking noise into a work space.
Claim 2
Independent Claim
109 words
A system for noise-masking having a noise generation and masking system consisting of: first and second noise generators for producing random noise; first and second narrow band equalizers respectively connected to the outputs of said first and second noise generators for producing electronic signals equivalent to equalized audio-noise in first and second channels; and means connected to both said first and second channels for receiving and combining signals from said first and second channels to produce a third channel of electronic signal corresponding to equalized audio-noise, said electronic signals of said first, second and third channels being for controlling speakers for directing non-localizable masking noise into a work space.
Claim 3
Dependent Claim
21 words
The system of claim 1 including: first, second and third power amplifiers respectively connected to said first, second and third channels.
Claim 4
Dependent Claim
37 words
The system of claim 2 including: an array of speakers positioned to direct masking noise into work space, said first, second and third power amplifiers each being connected to selected ones of said speakers in said array.
Claim 5
Dependent Claim
84 words
The system of claim 3 wherein: said array includes first, second and third sets of said speakers arranged in rows, one of said rows of speakers alternately containing speakers in said first set and said third set, and alternate ones of said rows containing speakers in said second set and said third set, with one of said lines alternately containing speakers in said second set and said third set so that, along any row and along any line, adjacent speakers belong to different sets.
Claim 6
Dependent Claim
21 words
The system of claim 1 wherein: said means is a summer which adds the signals in said first and second channels.
Claim 7
Dependent Claim
49 words
The system of claim 1 wherein said means for receiving and combining signals comprises: first and second power amplifiers respectively connected to said first and second channels; and transformer means connected between the outputs of said first and second power amplifiers for producing said third channel of electronic signal.
Claim 8
Dependent Claim
42 words
The system of claim 6 including: an array of speakers positioned to direct masking noise into work space, the outputs of said first and second power amplifiers and said transformer each being connected to selected ones of said speakers in said array.
Claim 9
Dependent Claim
84 words
The system of claim 7 wherein: said array includes first, second and third sets of said speakers arranged in rows, one of said rows of speakers alternately containing speakers in said first set and said third set, and alternate ones of said rows containing speakers in said second set and said third set, with one of said lines alternately containing speakers in said second set and said third set so that, along any row and along any line, adjacent speakers belong to different sets.
Claim 10
Dependent Claim
140 words
A noise-masking system comprising: a loudspeaker array positioned to provide masking noise into a space, said loudspeaker array comprising first, second and third sets of speakers; first and second noise generators, first and second equalizers respectively connected to said first and second equalizers respectively connected to said first and second noise generators, first and second channels connected to the outputs from said first and second equalizers so that said first and second channels carry independent electrical signals corresponding to equalized audio-frequency noise, said first and second channels being respectively connected to said first and second sets of speakers; and means connected to said first and second channels for combining the signals in said first and second channels for producing a third channel of different but related equalized audio-frequency signal, said third channel being connected to said third set of speakers.
Claim 11
Dependent Claim
140 words
A noise-masking system comprising: a loudspeaker array positioned to provide masking noise into a space, said loudspeaker array comprising first, second and third sets of speakers; first and second noise generators, first and second equalizers respectively connected to said first and second equalizers respectively connected to said first and second noise generators, first and second channels connected to the outputs from said first and second equalizers so that said first and second channels carry independent electrical signals corresponding to equalized audio-frequency noise, said first and second channels being respectively connected to said first and second sets of speakers; and means connected to said first and second channels for combining the signals in said first and second channels for producing a third channel of different but related equalized audio-frequency signal, said third channel being connected to said third set of speakers.
Claim 12
Dependent Claim
27 words
The system of claim 9 wherein: said sets of speakers are arranged in an array such that each speaker has only speakers of other sets adjacent thereto.
Claim 13
Dependent Claim
36 words
The system of claim 10 wherein: said speaker array is arranged in rows, and one of said channels is connected to alternate speakers in one row and is connected to alternate speakers in the adjacent row.
References Cited (Backward Citations)
DE655508C
Cited
GB988444A
Cited
US3138667A
Cited
US3308237A
Cited
US3280258A
Cited
US3478167A
Cited
US3567863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |