Vehicle pass-by and community noise monitor
US4287771A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1979 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Oct 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H3/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosure is related to a sound level meter including unique features for measuring, storing and displaying a maximum sound level generated by a passing motor vehicle or the like. The meter operates as an ordinary sound level meter until a predetermined threshold noise level is reached, at which time a novel circuit continuously detects the incoming sound level and electrically stores the maximum value detected. A comparison means compares the incoming sound level with the maximum stored level. When the incoming sound level decreases by a predetermined amount below the maximum stored value, a circuit is energized to lock the maximum value detected in a memory device. Additional means are provided to visually display the stored value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.