| ??? 11/28/07 13:49 Read: times |
#147508 - Miniscule Responding to: ???'s previous message |
Erik Malund said:
... the echo that comes back is minuscule. Yes, I'd gathered that much from searches so far. Then again, I think much the same can be said of IR if you were to build a receiver from scratch...? a schematic for such a unit, but that would be a starting point. Yes, I've seen a few schematics for that kind of thing - the main question is what kind of modulation & coding would be appropriate for carrying the small data payloads... |
| Topic | Author | Date |
| Ultrasound Data Link | 01/01/70 00:00 | |
| Not really ultrasonic. | 01/01/70 00:00 | |
| The other issue ... | 01/01/70 00:00 | |
| Echoes | 01/01/70 00:00 | |
| Speed of sound vs. speed of light | 01/01/70 00:00 | |
| multipath | 01/01/70 00:00 | |
| Signal attenuation is very big | 01/01/70 00:00 | |
| Similarity to IR remote | 01/01/70 00:00 | |
| the cheapest ultrasound transceivers ... | 01/01/70 00:00 | |
| Frequency ? | 01/01/70 00:00 | |
| Fish finder freq. | 01/01/70 00:00 | |
| Miniscule | 01/01/70 00:00 | |
| Thanks - that's useful | 01/01/70 00:00 | |
RC5 should do it | 01/01/70 00:00 |