US3795873A
Expired / Lapsed
US
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Multichannel noise simulator
Assignee: United States Department of the Navy
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Filing: 1973-02-01
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Granted: 1974-03-05
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Expires: 1993-02-01
Abstract
Abstract A multichannel noise simulator having a variable interchannel correlation approximates the noise found at the output of an array of hydrophones. The simulator can be adjusted to control interchannel correlation to simulate a real array noise which can vary from being completely uncorrelated to highly correlated. The output of a band limited noise source is switched sequentially from one output line to the next at a fixed sample rate. Since the sample rate has a correlation proportional to the reciprocal of the bandwidth, the correlation is varied by varying the bandwidth of the input noise. The change of sample rate thus permits the noise in various channels of the multichannel simulator to range from uncorrelated to highly correlated.
Inventors
- 👤 M Fein
- 👤 R Hilt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
G; G10; G10H; G10H5/00; H; H03; H03B; H03B29/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A multichannel noise simulator comprising: a random noise generator; a variable low band pass filter, the output of said noise generator being connected to the input of said low band pass filter; a wide band amplifier having the input thereof connected to the output of said low band pass filter; a plurality of switching means in communication with the output of said wide band amplifier; a plurality of channels, each switching means being connected to a corresponding channel in said plurality of channels; means for energizing each of said plurality of switching means in a sequential order; a plurality of auxiliary inputs; and summing and amplifying means in each of said plurality of channels for summing and amplifying the output of said amplifier with said plurality of auxiliary inputs.
Claim 2
Dependent Claim
129 words
A multichannel noise simulator comprising: a random noise generator; a variable low band pass filter, the output of said noise generator being connected to the input of said low band pass filter; a wide band amplifier having the input thereof connected to the output of said low band pass filter; a plurality of switching means in communication with the output of said wide band amplifier; a plurality of channels, each switching means being connected to a corresponding channel in said plurality of channels; means for energizing each of said plurality of switching means in a sequential order; a plurality of auxiliary inputs; and summing and amplifying means in each of said plurality of channels for summing and amplifying the output of said amplifier with said plurality of auxiliary inputs.
Claim 3
Dependent Claim
23 words
The noise simulator of claim 1 wherein the means for energizing each of said plurality of switching means comprises a shift register-counter-clock combination.
Claim 4
Dependent Claim
34 words
The noise simulator of claim 2 wherein said shift register-counter-clock combination further includes a plurality of buffer-switch driver sets, there being one buffer-switch driver set corresponding to each of said plurality of switching means.
Claim 5
Dependent Claim
18 words
The noise simulator of claim 3 wherein each of said plurality of switching means includes an FET switch.
References Cited (Backward Citations)
US2974198A
Cited
US3311868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |