Linear phase low pass filter

摘要: An electrical signal filter composed of a pair cascaded sections in which the group delays two are matched so that their non-linear effects cancel passband, resulting an overall linear phase. In addition, attenuation slope after first null one section's stopband response is complemented by other filter's attenuation. This prevents from falling to extremely low values as with some filters, which, turn, limits time domain overshoot. The passband delay and characteristics controlled appropriate selection ripple order number parameters filter. preferred embodiment, elliptic Chebyschev type. invention can be implemented analog-component active circuit or digital