US3844175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise source level detection
Assignee: Individual
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Filing: 1973-02-26
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Granted: 1974-10-29
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Expires: 1993-02-26
Abstract
Abstract The method of measuring the noise emanating from a noisy vehicle in a manner that reduces the measured quantity to a unit value, and hence, independent of any specific distance of vehicle-tosound detector. The method uses a sound pressure level detector and a range measuring device, such as a radar, the output of the range device continuously compensating the sound pressure level detected for distance, to thereby produce a quantity defined as the noise source level.
Inventors
- 👤 E Hixson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/86; G01H; G01H3/00; G01H3/10; G01H3/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
The method of measuring noise from a moving vehicle, comprising the steps of: detecting at a measuring point with a sound level measurer the noise emanating from a vehicle moving along a straight path a known distance from said point; logarithmically converting the detected sound level to decibels referred to 2 X 10 5 newtons/meter2; detecting at the measuring point with doppler radar means the timing of doppler returns from said vehicle and calculating from the known distance of said path to said point the range of said point to vehicle during the sound level detection; logarithmically converting the range information as follows: 20log10r, where r equals range in meters; and adding the logarithmically converted detected sound level to the logarithmically converted range to produce a noise source level.
Claim 2
Independent Claim
129 words
The method of measuring noise from a moving vehicle, comprising the steps of: detecting at a measuring point with a sound level measurer the noise emanating from a vehicle moving along a straight path a known distance from said point; logarithmically converting the detected sound level to decibels referred to 2 X 10 5 newtons/meter2; detecting at the measuring point with doppler radar means the timing of doppler returns from said vehicle and calculating from the known distance of said path to said point the range of said point to vehicle during the sound level detection; logarithmically converting the range information as follows: 20log10r, where r equals range in meters; and adding the logarithmically converted detected sound level to the logarithmically converted range to produce a noise source level.
Claim 3
Dependent Claim
39 words
The method as set forth in claim 1, and including producing a reference distance potential indicative of a standard reference distance; and adding said reference distance potential to said logarithmically converted detected sound level and said logarithmically converted range.
Claim 4
Dependent Claim
19 words
The method as set forth in claim 2, and including weighting the output detected by said sound level measurer.
Claim 5
Dependent Claim
21 words
The method as set forth in claim 2, wherein said detecting at the measuring point is performed with a directional microphone.
Claim 6
Dependent Claim
20 words
The method as set forth in claim 2, and including correcting said logarithmically converted range for other than spherical spreading.
Claim 7
Dependent Claim
21 words
The method as set forth in claim 2, and including continuously plotting the output while the vehicle moves along the path.
Claim 8
Dependent Claim
35 words
The method as set forth in claim 6, wherein said plotting is performed relative to polar coordinates, the location of the plot corresponding to the direction of the vehicle with respect to the measuring point.
Claim 9
Dependent Claim
39 words
The method As set forth in claim 6, wherein said radar means angularly tracks said moving vehicle and produces angular position information and wherein said plotting is performed with respect to polar coordinates using said angular position information therefor.
Claim 10
Independent Claim
49 words
The method of measuring noise from a moving vehicle, comprising the steps of: detecting at a measuring point the sound pressure of the noise emanating from the vehicle; and multiplying said sound pressure by range information to produce an output propotional to source pressure strength normalized to unit distance.
Claim 11
Independent Claim
49 words
The method of measuring noise from a moving vehicle, comprising the steps of: detecting at a measuring point the sound pressure of the noise emanating from the vehicle; and multiplying said sound pressure by range information to produce an output propotional to source pressure strength normalized to unit distance.
Claim 12
Dependent Claim
26 words
The method as set forth in claim 9, and including continuously polar plotting the results of said multiplying versus the angle of detection to moving vehicle.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |