| ??? 11/28/07 12:42 Read: times |
#147499 - Signal attenuation is very big Responding to: ???'s previous message |
when i experimented with this. Offcource , maybe something
can be/was wrong in may experiments, but as i remember attenuation was very, very big. You will need extremally high gain (maybe with automatic gain correction) and good bandpass filtering. Normal audio sounds (2...6 kHz) maybe will be handled more easy. In addition You can use DTMF signalling chips or soft. regards |
| 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 |