Abstract: A system for digitally quantizing, at high resolution, relatively small vations of an analog input signal. Initially, a reference level signal having a preselected value close to the average magnitude of the analog signal being quantized is compared with the analog input signal. The difference between these two signals is amplified and then analog to digital converted. By an iterative process, the reference level is adjusted as necessary to closely track the gross magnitude level of the analog input signal. Analog to digital conversion is applied only to the small difference signal, thereby allowing quantization to occur with high resolution. The system automatically keeps track of gross signal excursions so that the magnitude of the quantized signals is also available to the user.

Abstract: Disclosed is a plurality of parallel resistive-capacitive clamping circuits ndividually coupling the bit "input" and bit "output" terminals of a multi-bit, serial/parallel (S/P), synchronous/asynchronous (S/A) shift register (e.g., CD-4034A). The clamping circuits provide the contents of the shift register with an increased immunity from the effects of transients, radiation, and temporary power failures.

Abstract: An economical system for both recording multiplexed digital data on a tape recorder and decoding the stored data.

Abstract: Automatic testing of digital sequential logical devices employing a read y memory programmed with a series of inputs. The read only memory programmed outputs are then compared in EXCLUSIVE OR gates with the outputs of the device under test.

Abstract: A solid state electronic circuit designed to accept coded information to trol the function of a mine mechanism.