In Pitch synchronous split-band LPC (PS-SBLPC) vocoder the authors describe an algorithm to identify pitch cycle boundaries. In "Pitch cycle detection" section, this sentence describes something that authors termed a "chirped response LPC analysis filter":
An LPC analysis filter is just a FIR filter with LPC-derived coefficients. What is the "chirped response" in relation to FIR filters? I understand that authors try to reduce severity of anti-resonances that can nullify whole useful signal, but how do they do it?