Acousto-optic devices are used for the control of laser radiation in different branches of science and technology, and for real-time information processing. Optical systems with two-dimensional architectures make it possible to realize space-multichannel information processing systems. We provide a historical excursus, a presentation of the contemporary state of research, and examples of experimental studies carried out at the Leningrad Institute of Aviation Instrument Making. Some realizations of acousto-optic systems for spectral, correlation, and filtering analysis of electrical signals are discussed. The parameters of several tunable acousto-optic filters are presented. Some problems connected with the manufacturing of acousto-optic elementary base and potentially feasible parameters of acousto-optic systems are discussed.