Abstract: A processor controlled test set for testing special service circuits of a telecommunication system. A microprocessor controls the overall operation of the test set, while a digital signal processor provides high speed timing signals to the various test circuits for generating the wave forms used in testing, as well as analyzes the test result signals that are converted into digital signals. A calibration of the test generator signals as well as the signal measuring path is carried out prior to the test sequence. The digital signal processor also provides gain control over a talking path to maintain stability thereof. An I/O circuit of the test set provides plural communication paths between remote equipment and the test set to initiate and carry out various tests. Processors in the I/O module are effective to convert the various protocols of the serial data, by way of software, to digital bit streams usable by the test set.

Abstract: A processor controlled test set is disclosed for testing special service circuits of a telecommunication system. A microprocessor controls the overall operation of the test set, while a digital signal processor provides high speed timing signals to the various test circuits for generating the wave forms used in testing, as well as analyzes the test result signals that are converted into digital signals. A calibration of the test generator signals as well as the signal measuring path is carried out prior to the test sequence. The digital signal processor also provides gain control over a talking path to maintain stability thereof. An I/O circuit of the test set provides plural communication paths between remote equipment and the test set to initiate and carry out various tests. Processors in the I/O module are effective to convert the various protocols of the serial data, by way of software, to digital bit streams usable by the test set.

Abstract: Bar codes imprinted or otherwise applied to an object are read and decoded by focusing light reflected from the code by means of an object lens to a light responsive transducer. Electrical signals produced by the transducer are correlated and converted from a trinary code format into a binary code format. The trinary code utilizes bars and half bars made up of segments in one or more of four quadrants to represent a decimal equivalent number. This trinary code is applied to a converter where logic converts the trinary signals into equivalent binary signals which are then translated from a serial format into a parallel format for further processing by conventional binary code processors.

Abstract: Bar codes imprinted or otherwise applied to an object are read and decoded by focusing light reflected from the code by means of an objective lens to an image intensifier tube. Light energy reflected from the code impinges on the photo cathode of the image intensifier tube thereby causing an electron beam to generate a display on a phosphor screen with the electron beam deflected to center the code image on the phosphor screen. A fiber optic array channels light from the phosphor screen to an array of zones of photo sensors each zone having an output coupled to a correlation circuit. Output voltages from the correlation circuits are simultaneously coupled to acquisition, tracking and reading logic. Initially, upon detecting the presence of a code on an object, the acquisition and tracking logic responds thereto to produce deflection voltages to the image intensifier tube to provide centering on the phosphor screen.