PAPER SESSION 6: SIGNAL PROCESSING
A New Realization of Linear-Phase Magnitude Complementary Network for Digital Bi-Amplifier
D. Sookcharoenphol, C. Chakreeteekapakvisi
King�s
Monkut Institute of Technology, Bangkok, Thailand
A new realization of real-time linear-phase magnitude
complementary filter pair structure that is based on a
combination of two parallel all-pass networks is proposed
in this paper for divides wide audio spectral
into low and high frequency bands before passing to
digital switching amplifiers. Each all-pass network
consists of a cascade of a noncausal and causal IIR
filter to obtain the linear-phase characteristics. The
advantage of the proposed network is that it does not
introduce a self-distortion and can save power consumption.
Since the magnitude responses of each
network have only squared of sub all-pass filters.
While the power complementary network has the
cross product of sub all-pass 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.
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