| ??? 06/10/11 16:17 Modified: 06/10/11 16:21 Read: times |
#182590 - I have to agree Responding to: ???'s previous message |
Per Westermark said:
In short - you can either have a 50-step table or add a mathematical formula for the conversion. But the foot pedal user will not care - or even be able to notice - if you have calibrated the transformation or not. You can look at the datasheet for a potentiometer if you want just to look at a graphical curve of value as function of angle and use that as a general transform. The transformation process of calibration will guarantee a linearity within a dB or two, but technically does it really matter if you are "that" linear. This means that you're at rotation 10, but you may actually be at rotation 12, but just using a modified log table to kind of approximate the transformation will get close. So, you would not be at 10, but maybe 15. According to Per's argument, the case of linearity would not matter too much if it solely based on the user's judgement and is not being recorded to reproduce some musical note via electronic synthesizers. If you did want to transform to an LUT, youre best bet is to somehow use the dB regime because with dB's you can easily make a straight line that will have a slope and intercept. |
| Topic | Author | Date |
| Linearizing a log potmeter | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| Sure it is possible... | 01/01/70 00:00 | |
| No need to calibrate | 01/01/70 00:00 | |
| Desired result | 01/01/70 00:00 | |
| Lookup Table | 01/01/70 00:00 | |
| Help with lookup table | 01/01/70 00:00 | |
| Formula | 01/01/70 00:00 | |
| Formula | 01/01/70 00:00 | |
| Not sure what you mean there | 01/01/70 00:00 | |
| He's quoting a line from a movie | 01/01/70 00:00 | |
| Like CRM-114 | 01/01/70 00:00 | |
| Bang | 01/01/70 00:00 | |
| Youtube snippet | 01/01/70 00:00 | |
| I have to agree | 01/01/70 00:00 | |
| App note | 01/01/70 00:00 | |
clickable link | 01/01/70 00:00 |