Howtosignalprocessing
- What is roll-off in low-pass filter?
- How do you calculate the roll-off rate of a low-pass filter?
- What is roll-off in filter design?
What is roll-off in low-pass filter?
The steepness of the gain in the stop band is referred to as the filter's roll-off. All first-order filters have a 20 dB/decade roll-off. The same roll-off can also be specified as 6 dB/octave. An octave is a term borrowed from music and represents a doubling of frequency.
How do you calculate the roll-off rate of a low-pass filter?
The roll-off rate of the nth-order filter is 20 × n dB/decade or 6 × n dB/octave, where “n” is the order of the filter (Figure 3). A “sharp” multistage filter may have a roll-off of 20 dB/decade, while a less-sharp single-stage one will have just a 3-dB/decade value.
What is roll-off in filter design?
Roll-off is the steepness of a transfer function with frequency, particularly in electrical network analysis, and most especially in connection with filter circuits in the transition between a passband and a stopband.
