by tadcook » Sun Oct 16, 2011 6:45 pm
Excuse my possible ignorance on this issue, but isn't the volume control already logarithmic?
I haven't made any measurements, but I assume if it were linear that the output in mv. would change in direct proportion to the position of the volume control, which I assume is that vertical slider marked Volume Bar on the lower right side of the UI. This would sound mighty funny to the human ear.
If it is linear in terms of db, meaning that movement a certain distance produces the same db change at any point along the slider, then it is already logarithmic, because db (which always expresses a ratio, not some fixed value like watts or volts) can be defined as 20log mv2/mv1. In other words, you take the log of the ratio of the two levels in volts or millivolts, and multiply times 20. For comparing watts, it is the same operation times 10.
The range of travel of the slider control is short, making it difficult to verify this by measurement.
Or am I misunderstanding something here?
Excuse my possible ignorance on this issue, but isn't the volume control already logarithmic?
I haven't made any measurements, but I assume if it were linear that the output in mv. would change in direct proportion to the position of the volume control, which I assume is that vertical slider marked Volume Bar on the lower right side of the UI. This would sound mighty funny to the human ear.
If it is linear in terms of db, meaning that movement a certain distance produces the same db change at any point along the slider, then it is already logarithmic, because db (which always expresses a ratio, not some fixed value like watts or volts) can be defined as 20log mv2/mv1. In other words, you take the log of the ratio of the two levels in volts or millivolts, and multiply times 20. For comparing watts, it is the same operation times 10.
The range of travel of the slider control is short, making it difficult to verify this by measurement.
Or am I misunderstanding something here?