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  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2019-06-28
    Description: Image resolution, image quality and data transmission rate of remote imaging systems continuously controlled by operator intervention. Set of levers allows operator to control independently frame rate, frame size and image quality in bits per pixel. System used for imaging systems in aircraft or remotely piloted vehicles.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14689 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 336
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  • 2
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    Publication Date: 2019-06-28
    Description: Image data are compressed for transmission by simple, economical circuitry. Compressor handles data in blocks of 64 samples. Mean from previous line is subtracted, and pseudo-random sequence of positive and negative 1's multiplies samples of each block. Hadamard transform applied to blocks yields 64 transform coefficients. Each coefficient is compared with approximation to corresponding coefficient of previous line, and difference is quantized. Values are transmitted or stored. Procedure is reversed to reproduce image.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14041 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 28
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  • 3
    Publication Date: 2019-06-28
    Description: Algorithms and equations are used for conversion of standard television imaging system information into directly usable spatial and dimensional information. System allows utilization of spacecraft imagery system as sensor in application to operations such as deriving spacecraft steering signal, tracking, autonomous rendezvous and docking and ranging.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-12050 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
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  • 4
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    Publication Date: 2019-06-28
    Description: Proposed video teleconferencing system displays drawings, photographs, and text for conferees. Although new system, called TELEDEMO, does not present live scenes from conference locations, it cost far less than conventional teleconference services. Widely scattered participants communiate by voice, graphics, and images over telephone lines.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16057 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 61
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  • 5
    Publication Date: 2019-06-28
    Description: Compressing technique calculates activity estimator for each segment of image line. Estimator is used in conjunction with allowable bits per line, N, to determine number of bits necessary to code each segment and which segments can tolerate truncation. Preprocessed line data are then passed to adaptive variable-length coder, which selects optimum transmission code. Method increases capacity of broadcast and cable television transmissions and helps reduce size of storage medium for video and digital audio recordings.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14823 , NASA Tech Briefs (ISSN 0145-319X); 5; 3; P. 286
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  • 6
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    In:  Other Sources
    Publication Date: 2019-06-28
    Description: Key elements of system are imaging and nonimaging sensors, data compressor/decompressor, interleaved Reed-Solomon block coder, convolutional-encoded/Viterbi-decoded telemetry channel, and Reed-Solomon decoding. Data compression provides efficient representation of sensor data, and channel coding improves reliability of data transmission.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-13545 , NASA Tech Briefs (ISSN 0145-319X); 1; 4; P. 536
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  • 7
    Publication Date: 2019-07-27
    Description: The paper presents the Multiwavelength Monolithic Integrated Fiber Optic Terminal (MMIFOT) developed under NASA sponsorship. The program aims to utilize the advantage of optical fiber and integrated optical device technology to achieve parallel transmission of many data channels over the same optical fiber link, and to develop an eight channel wavelength multiplexed fiber optic link that transmits eight bit words in a parallel format at a nominal rate of 20 Mw/s; in the second phase of the program a transmitter/multiplexer chip will be developed. The MMIFOT configuration, the receiver/demultiplexer development, and the waveguide detector development are discussed, concluding that the first phase of the MMIFOT program will culminate in the demonstration of an eight channel receiver/demultiplexer chip with a four channel breadboard multiplexer with the data rate of 20 Mbps per channel with a dynamic range of minimum 20 dB.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Guided wave optical systems and devices II; April, 17, 18, 1979; Washington, D. C.
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  • 8
    Publication Date: 2019-07-13
    Description: This paper serves as an update for the Multiwavelength Monolithic Integrated Fiber Optic Terminal (MMIFOT) being developed by MDAC-St. Louis for NASA's Johnson Space Center. The program objective is to utilize guided wave optical technology to develop a passive optical wavelength multiplexing subsystem with a single mode optical fiber serving as the transmission medium.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Seminar on Guided-wave optical and surface acoustic wave devices, systems and applications; Jul 29, 1980 - Jul 31, 1980; San Diego, CA
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