PAPER SESSION 6: SIGNAL PROCESSING
A New Realization of LinearPhase Magnitude Complementary Network for Digital BiAmplifier
D. Sookcharoenphol, C. Chakreeteekapakvisi
King’s
Monkut Institute of Technology, Bangkok, Thailand
A new realization of realtime linearphase magnitude
complementary filter pair structure that is based on a
combination of two parallel allpass networks is proposed
in this paper for divides wide audio spectral
into low and high frequency bands before passing to
digital switching amplifiers. Each allpass network
consists of a cascade of a noncausal and causal IIR
filter to obtain the linearphase characteristics. The
advantage of the proposed network is that it does not
introduce a selfdistortion and can save power consumption.
Since the magnitude responses of each
network have only squared of sub allpass filters.
While the power complementary network has the
cross product of sub allpass filters that degrade an
efficiency of amplification. Moreover, the power complementary
network gives a high sensitivity to the
phase difference of two filters around the transition
band. The new structure can be reduced an implementation
complexity of the noncausal and causal filters
compared to the conventional structures. In addition,
the proposed structure provides a low sensitivity
to coefficients quantization thus bit rate can reduce,
example of simulations is also given.
