Abstract
The primary difficulties in producing acoustical holograms have been associated with the recording technique. This paper presents some of the important recording techniques and highlights the desirability and advantages of using two-dimensional arrays of linear, electroacoustic transducers for detecting holographic data in real time. Recent developments of a class of such arrays, namely the condenser-microphone arrays, are reviewed. This is followed by an outline of the major considerations involved in the design of such arrays, the discussion of their characteristics, and their immediate and future prospects in acoustical holography.
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