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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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Small, programmable, high speed PCM subsystem, supports the variety of signals inherent in sophisticated equipment. A signal generated by a transducer is first conditioned to the proper signal range, then sampled by an external multiplexer or by the subsystem directly and then converted and transmitted to a receiving station.
Minimum noise and maximum information bandwidths for phase locked loops in demodulated FM multiplexed subcarriers
Air and sea navigation and traffic control satellite system, discussing time division multiplexing and digital data links
Engineering specifications and prototype model of SS/DSB multiplexer
Data system, when used with a rotary transformer, results in increased life, negligible noise, and capability for a large number of data channels in testing rotating equipment. It is used to multiplex many channels of analog transducer output data and convert this signal to binary digital output.
Technique uses a helical-scan video recorder with auxiliary signal-conditioning equipment to provide an inexpensive, high-capacity magnetic tape recording of a 112 channel, phase-locked, multiplexed, baseband signal.
Design requirements for multiplex digital data bus subsystem in space shuttle vehicles
Special purpose computer organized as time-shared digital filter for real time applications with adaptable coefficients, programming and multiplexing scheme
AM baseband telemetry system for wideband signal transmission emphasizing SSB, DSB and quadrature multiplexed DSB modulation techniques
Multiplexer-interface system for digital nuclear and position control data transfer from high altitude balloons to earth monitoring instruments
Design and reliability of digital systems for hard cores of fault tolerant computers /hybrid- redundant systems/, discussing advantages over multiplexed systems
Coherent digital communication systems optimal design based on unified theory, discussing tradeoffs between error rates, Doppler tracking capability and time and frequency division multiplexing
Floating aperature, zero-order predictor /ZOP/ circuit eliminates telemetered data redundancy by examining data from each sensor before it is multiplexed and transmitted. Digital devices to implement design are off-the-shelf items such as gates, registers and flip-flops, which are readily amenable to large-scale integration techniques.
Information gathering system measures and records vibrations which affect personnel comfort in space, air, and surface vehicles. Three vibration transducers with mutually perpendicular axes control the frequency output of voltage controlled oscillators /VCO/. Outputs of VCO'S are multiplexed and then recorded on one track of stereo tape recorder.
Communications satellite system uses pseudo-random time frequency multiplexing technique for extracting real-time meteorological data from great number of isolated weather stations /data collection platforms/ situated randomly throughout the world.
Minimum time delay unit for conventional time multiplexed data compression channels
Earth satellite relay station for frequency multiplexed voice transmission
Time division multiplexed telemetry transmitting system controlled by programmed memory