Wilhelm Cauer, who designed an “elliptic” type of these devices, also names a ladder topology used to create them from inductors and capacitors. For 10 points each:
[10e] Name these devices that are designed to stop all frequencies in their stopband. The “low-pass” type of these devices allows low-frequency signals to pass through.
ANSWER: filters [accept low-pass filters or elliptic filters]
[10m] Butterworth filters are designed to maintain a flat frequency response in the passband as compared to this Russian scientist’s namesake filters, whose poles are found using his namesake polynomials denoted by “T sub n.”
ANSWER: Pafnuty Chebyshev [or Pafnuty Lvovich Chebyshev; accept Chebyshev filters or Chebyshev polynomials]
[10h] Butterworth filters have a worse value of this quantity than Chebyshev filters, meaning that the stopband is not as well-defined because the response has a smaller slope at its edges.
ANSWER: roll-off
<Physics>