frequency response to phase and magnitude representation
[db, phi] = dbphi(repf [, mod])
vector of gains (db) and phases (degrees)
vector of complex frequency response
character string
"continuous" representation between -infinity and +360 degrees (default)
representation between -360 and 0 degrees
db(k)
is the magnitude of repf(k)
expressed in dB i.e.
db(k)=20*log(abs(repf(k)))/log(10)
and phi(k)
is the phase
of repf(k)
expressed in degrees.