| ??? 05/29/05 16:46 Read: times |
#94091 - I beg a question... Responding to: ???'s previous message |
Hmmm.......If Jay does truly know that his signal is sinusoidal and he is willing to sample for a long enough time is it really necessary for him to really know the frequency? I think not.
I could envision a sampling routine that ran in a loop that took readings until the maximum value went by and then polled till the subsequent minimum value went by. Certainly there is a requirement to sample fast enough so that the peak is not missed but there is really no need to actually determine the frequency of the sampled signal in order to compute the sinusoidal RMS value. Even if his sample rate was at or below the single's sinusoidal frequency he could statistacally determine the min and max values if he sampled for a long enough period of time while dithering the sample rate and assuring that the band width of A/D system was up to the task. Shoot holes in the ideas if I'm wholly wrong!! Michael Karas |
| Topic | Author | Date |
| RMS Calculation | 01/01/70 00:00 | |
| Going back to basics... | 01/01/70 00:00 | |
| How Many Samples Per Second? | 01/01/70 00:00 | |
| Square Root Algorithm | 01/01/70 00:00 | |
| RMS for sinusoidal signals | 01/01/70 00:00 | |
| Clarification | 01/01/70 00:00 | |
| I beg a question... | 01/01/70 00:00 | |
| Full o' holes | 01/01/70 00:00 | |
Bang on target... | 01/01/70 00:00 | |
| thats true... | 01/01/70 00:00 | |
| RMS Value | 01/01/70 00:00 | |
| Please elaborate more... | 01/01/70 00:00 | |
| Elaboration | 01/01/70 00:00 | |
| Correction | 01/01/70 00:00 | |
| DC+AC RMS | 01/01/70 00:00 | |
| DC contribution to total rms value | 01/01/70 00:00 | |
| Thanx Anywayz... | 01/01/70 00:00 | |
| square root by Newton's Rule | 01/01/70 00:00 | |
| Lookup table | 01/01/70 00:00 | |
| better option...as of now | 01/01/70 00:00 |