Abstract
First, a generalized construction of an acoustical imaging system which consists of both multiplicative and additive signal processing parts is shown. Then, conventional imaging systems are explained and classified as special cases of the generalized form, and their special features are compared comprehensively from the viewpoint of the goodness of the reconstructed images. It is shown that, in general, multiplicative processing is effective for resolution improvement and imaging under phase turbulence, while additive processing is effective for imaging under additive noises.
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