Communication via the auditory, tactile, and kinesthetic senses.
Properties of favorable coding schemes, applying results to text transmission through auditory and tactile senses
MACHINE LANGUAGE↗
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Results for “System Code”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Prefix coding of histograms for minimal storage.
Prefix coding of histograms for minimal storage
HISTOGRAM↗
Lower bounds to error probability for coding on discrete memoryless channels. II.
Lower bounds to minimum error probability for block coding on noisy discrete memoryless channels
CHANNEL CAPACITY↗
Coding and synchronization - The signal design problem.
Synchronization in coded communication systems, considering phase lock loop and square wave correlation function
Stiffler, J. J.↗
Block coding for space communications.
Block coded telemetry systems design for phase coherent space communication employing double conversion superheterodyne phase locked receivers
Lindsey, W. C.↗
Block-coded communications
Theory for block-coded telemetry systems is useful in testing performance of one- and two-way, phase-coherent telemetry systems when double-conversion, superheterodyne, phase-locked receiver, preceded by bandpass limiter is used to track carrier.
Lindsey, W. C.↗
A concatenated coding scheme for extremely low error probabilities.
A coded command system is described which is capable of achieving extremely low error probabilities at moderate signal-to-noise ratios. Emphasis is placed on the implementation of the spaceborne portions of the system.
Stiffler, J. J.↗
Specifications and programs for computer software validation
Three software products developed during the study are reported and include: (1) FORTRAN Automatic Code Evaluation System, (2) the Specification Language System, and (3) the Array Index Validation System.
Browne, J. C.↗
Method and apparatus for decoding compatible convolutional codes
This invention relates to learning decoders for decoding compatible convolutional codes. The decoder decodes signals which have been encoded by a convolutional coder and allows performance near the theoretical limit of performance for coded data systems. The decoder includes a sub-bit shift register wherein the received sub-bits are entered after regeneration and shifted in synchronization with a clock signal recovered from the received sub-bit stream. The received sub-bits are processed by a sub-bit decision circuit, entered into a sub-bit shift register, decoded by a decision circuit, entered into a data shift register, and updated to reduce data errors. The bit decision circuit utilizes stored sub-bits and stored data bits to determine subsequent data-bits. Data errors are reduced by using at least one up-date circuit.
Doland, G. D.↗
A recommended R equals 1/2, K equals 32, Quick-Look-In convolutional code for NASA use
A new R = 1/2 K = 32 quick-look-in code is described and compared to the R = 1/2 K = 32 Massey-Costello code now used in some NASA systems. The new code, has the optimum distance profile property. This new code is shown, by comparison of Fano sequential decoding performance on a simulated Gaussian noise channel, to be computationally superior to the Massey-Costello code. The new code is also shown to be superior to the Massey-Costello code according to several analytical code criteria.
Massey, J. L.↗
Concatenated algebraic decoder
Technique for manipulating digital data consists of mating two separate coding/decoding methods to produce hybrid inner-code/outer-code system. Interactive digital circuitry is used to manipulate casually related digital data.
Source record↗
Conversion of LARSYS III.1 to an IBM 370 computer
A software system for processing multispectral aircraft or satellite data (LARSYS) was designed and written at the Laboratory for Applications of Remote Sensing at Purdue University. This system, being implemented on an IBM 360/67 computer utilizing the Cambridge Monitor System, is of an interactive nature. TAMU LARSYS maintains the essential capabilities of Purdue's LARSYS. The machine configuration for which it has been converted is an IBM-compatible Amdahl 470V/6 computer utilizing the time sharing option of the currently implemented OS/VS2 Operating System. Due to TSO limitations, the NASA-JSC deliverable TAMU LARSYS is comprised of two parts. Part one is a TSO Control Card Checker for LARSYS control cards, and part two is a batch version of LARSYS. Used together, they afford most of the capabilities of the original LARSYS III.1. Additionally, two programs have been written by TAMU to support LARSYS processing. The first is an ERTS-to-MIST conversion program used to convert ERTS data to the LARSYS input form, the MIST tape. The second is a system runtable code which maintains tape/file location information for the MIST data sets.
Williams, G. N.↗
Computer control of a far infrared interferometer
A simple interface has been designed for the automatic control and data collection from a Grubb Parsons Mark III cube interferometer. A computer is used to automatically step the movable mirror on the interferometer. Data may be directly input into the computer for immediate transformation or stored for later analysis via a fast Fourier transformation. The interface is based on a commercial analog-to-digital converter having a parallel-to-serial data converter. The device can also display ASCII characters sent from the computer in parallel binary code. The system is applicable to recording interferograms having long time durations and to measuring multiple interferograms for statistical averaging.
Breecher, J.↗
Coordinated crew performance in commercial aircraft operations
A specific methodology is proposed for an improved system of coding and analyzing crew member interaction. The complexity and lack of precision of many crew and task variables suggest the usefulness of fuzzy linguistic techniques for modeling and computer simulation of the crew performance process. Other research methodologies and concepts that have promise for increasing the effectiveness of research on crew performance are identified.
Murphy, M. R.↗
RFI channels
A class of channel models is presented which exhibit varying burst error severity much like channels encountered in practice. An information-theoretic analysis of these channel models is made, and conclusions are drawn that may aid in the design of coded communication systems for realistic noisy channels.
Mceliece, R. J.↗
Capacity of a multimode direct detection optical communication channel
The capacity is derived under both peak and average signal power constraints and without a signal bandwidth constraint. A random telegraph wave type signalling scheme of Kabanov is known to achieve capacity provided enough signalling bandwidth is available. In the absence of received background noise, an optimally coded PPM system is shown to achieve capacity with greatly reduced bandwidth as compared to Kabanov signals.
Tan, H. H.↗
The development of efficient coding for an electronic mail system
Techniques for efficiently representing scanned electronic documents were investigated. Major results include the definition and preliminary performance results of a Universal System for Efficient Electronic Mail (USEEM), offering a potential order of magnitude improvement over standard facsimile techniques for representing textual material.
Rice, R. F.↗