Oona Räisänen personal blog
Ultrasonic investigations in shopping centres
Many public address systems emit a continuous near-ultrasonic sound that is used for system health monitoring.
- Points
- 351
- HN comments
- 139
- Submissions
- 1
- Cited by
- 0 commenters
Science & SpaceTools & Productivity2024
On Hacker News
| Submitted | Title on HN | Points | Comments |
|---|---|---|---|
| Jun 9, 2024 | Ultrasonic investigations in shopping centres by GolDDranks | 351 | 139 |
