Howtosignalprocessing
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.
- How do you calculate roll-off factor?
- What is meant by roll-off rate?
- What is the roll-off factor of an ideal LPF?
- What does roll-off mean in audio?
How do you calculate roll-off factor?
The choice of the roll-off factor Alpha (that belongs to [0,1]) is a trade-off between several parameters : - the bandwidth of the baseband signal is equal to [-(1+ALpha)/2,(1+ALpha)/2] to determine the Spectrum shape of teh modulated signal.
What is meant by roll-off rate?
A: The rolloff rate is the rate of change of the output of the filter versus frequency. It is expressed as a loss per decade (a ten-times increase in frequency) or per octave (a two-time increase in frequency.
What is the roll-off factor of an ideal LPF?
A better compromise would be a roll off factor somewhere between 0.25 and 0.5 (B and C). Here the impulse response decays relatively quickly with small lobes, requiring a pulse shaping filter with a small number of taps, while still keeping the required bandwidth reasonable.
What does roll-off mean in audio?
Roll Off (or Rolloff) – Specifically rolloff refers to the action of a specific type of filter; one designed to roll off frequencies above or below a certain point. It is called roll off because the process is gradual.
