Validation of monolithic circuit test standards through an integrated COS/MOS multiplexer Final report, 25 Jun. 1968 - 31 Dec. 1969
Validating test standards for process control and testing of integrated circuits
Feryszka, R.↗
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An all monolithic MOS A/D converter - Low power clocks, multiplexers, registers, and A/D converter Final report
Research and developments of monolithic, MOS, ten bit, analog to digital converter
Eastman, J.↗
Television multiplexing system
System with single, standard, wideband line transmits ten or more real time TV video data displays over hard wire to recorders more than 22.5 km from source. Digital logic and integrated circuits ensure high reliability and low maintenance. System is adaptable for video sampling applications.
Simpkins, L. G.↗
Doubly multiplexing dispersive spectrometer.
Description of a spectrometer that incorporates 19 entrances and 19 exit slots. The instrument's dual capability to perform either one-dimensional imaging or alternately to give a spectrum with a high SNR over the entire source is shown. The instrument operates in the Littrow mode at f/8. The slot width and length for each mask are 0.625 and 3.5 mm, respectively, giving a total aperture length of 12.1 mm. The corresponding resolving power at 1.7 microns is 230.
Phillips, P. G.↗
Gaussian and click noise in an FM/FM multiplex receiver.
An FM/FM system is one in which the signal information frequency modulates a subcarrier, which, in turn, frequency modulates a main carrier for transmission. The detection process then involves two frequency demodulators in sequence. Using Rice's click model for both FM demodulators, we obtain the average click rate and an approximate output spectrum that include the effect of the impulses generated by the carrier demodulator on the subcarrier demodulation at and below threshold. We then focus on the threshold behavior of these systems and the proportioning of their modulation parameters so as to provide certain desired characteristics. We find that due to the filtering action of the second demodulator, the number of output clicks from carrier generated spikes can be orders of magnitude smaller, yet their contribution to the output noise can be much greater than that produced by the first demodulation.
Stochel, N. H.↗
Frame synchronization in time-multiplexed PCM telemetry with variable frame length.
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Timor, U.↗
Data multiplexer using a tree switch
Self-decoding FET-hybrid or integrated-circuit tree configuration uses minimum number of components and can be sequenced by clock or computer. Redundancy features can readily be incorporated into tree configuration; as tree grows in size and more sensors are included, percentage of parts that will affect given percentage of sensors steadily decreases.
Easton, R. A.↗
Frequency division multiplex technique
A system for monitoring a plurality of condition responsive devices is described. It consists of a master control station and a remote station. The master control station is capable of transmitting command signals which includes a parity signal to a remote station which transmits the signals back to the command station so that such can be compared with the original signals in order to determine if there are any transmission errors. The system utilizes frequency sources which are 1.21 multiples of each other so that no linear combination of any harmonics will interfere with another frequency.
Brey, H.↗
Frequency division multiplexer code 04236, serial no. 001, phase 2
Design principles and test results of modifications to two wideband channels, 8 kHz DS located at 44kHz and 16 kHz SSB located at 104 kHz, are given. Data cover power supply modifications, wideband operational amplifiers, trade-off to determine requirements for precision components, printed circuit board layout, applicability of original equipment specification No. 110438, and optimum wideband channel design.
Hauge, G.↗
Application of random time and frequency multiplexing to a data collection satellite.
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Clarke, S. P.↗
Capacity degradation due to interleaving and multiplexing
The capacity of an M-ary channel with N-ary coding is computed. It is found that the capacity of a very noisy channel is reduced by the factor (N-1)(log M)/(M-1)(log N). The results are applied to channels with noncoherent multifrequency shift keying and to concatenation of codes and interleaving.
Lyon, R. F.↗
Data system for multiplexed water-current meters
Flow rates at 32 flood plain locations are measured simultaneously by single digital logic unit with high noise immunity. Water flowing through pygmy current meters rotates element that closes electrical contact once every resolution, so flow rate is measured by counting number of closures in time interval.
Ramsey, C. R.↗
Multiplexed fiber-optic transmission system
Digital, audio, and video data channels spanning 100 megahertz bandwidth are transmitted via single fiber-optical link. System is flexible by virtue of its plug-in modularity and optical patchboard that allows it to adjust to data and bandwidth changes.
Bell, C. H.↗
A bound and approximation of delay distribution for fixed-length packets in an unslotted ALOHA channel and a comparison with time division multiplexing /TDM/
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Ferguson, M. J.↗
Multiplexed battery-bypass control system
Cell-bypass control system senses low capacity cells before they overcharge or discharge. Relay automatically removes defective cell (when it is detected) from battery circuit. System shows promise for improving batteries in computer standby power systems, electric vehicles, and energy storage systems.
Bennett, J. C.↗
Optimum receiver structures for phase-multiplexed modulations
A MAP (maximum a posteriori) estimation loop is derived for a QPSK signal and, by suitable approximation to the nonlinearity which arises as a consequence of the MAP theory, is reconfigured with practical realizations that are valid for high and low SNRs. In particular, it is shown that by approximating the hyperbolic tangent nonlinearity in the MAP estimation loop by the first two terms in its power series, an interesting practical realization of this loop results which applies at low SNRs. The error signal in this loop is formed by multiplying the error signal and lock detector output signal of a conventional biphase Costas loop. A generalized linear in-phase channel configuration is proposed which allows carrier reconstruction from an unbalanced QPSK signal at all ratios of data rates and powers in the two channels, even in the limit as these ratios simultaneously approach unity, i.e., balanced quadriphase.
Simon, M. K.↗
Multiplexed mass spectrometer for desorption studies
Microprocessor controlled mass spectrometer data acquisition system simultaneously monitors up to nine gaseous products emitted from heated substrate during thermal desorption experiments.
Bales, M.↗
Multiplexed logic controls solar-heating system
Four inexpensive thermocouples monitor temperatures at key points. On command from logic circuitry, dampers open and close to direct airflow, and fan and auxiliary heater shut on or off. Controlling complex arranges heating system in any one of four operating configurations.
Currie, J. R.↗