Abstract: A camera field-of-view is mapped with full depth-of-focus into electronic memory. Data concerning image intensities at selected points in image space are stored, along with data concerning the distances between the camera and these points in image space. Images with any focus and depth-of-focus can be generated by scanning the electronic memory during a reading thereof and convolving the data concerning image intensity with an adjustable-bandwidth low-pass spatial filter. The bandwidth of that filter is adjusted dependent on the data concerning distances between camera and points in image space. This image storage and image retrieval procedure conserves the size of electronic memory required to store and retrieve images with any focus and depth-of-focus.

Abstract: A system for digitally processing an analog signal, such as an audio signal, for recording and playback. The system comprises means responsive to the analog signal to produce sequences of binary 1's for those portions thereof whose amplitude exceeds a given signal level and to produce sequences of binary 0's for those portions thereof whose amplitude is less than said given signal level, and encoding means responsive to each sequence in the order of their occurrence to form a digital word representing the number of bits in each sequence. Also provided are memory means for storing said digital words in said order of occurrence, and means responsive to the stored digital words, in said order of occurrence, to produce a two level signal whose first level represents said sequences of binary 1's and whose second level represents said sequences of binary 0's. Filtering means can be provided to filter the two level signal to produce an apporoximate reproduction of the original analog signal.