By Topic

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • The Vivaldi aerial

    Publication Year: 1981
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    An aerial having a gain of about 10 dBI with associated sidelobe level of ¿ 20 dB over an instantaneous frequency bandwidth extending from 2 GHz to 40 GHz has been devised at the Philips Research Laboratories, Redhill. View full abstract»

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  • A review of automatic gain control theory

    Publication Year: 1981, Page(s):579 - 590
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1163 KB)

    The paper presents the general theory of automatic gain control (a.g.c). It includes discussions on loop gain, regulation and the relation between loop parameters and output level stability. An equivalent circuit is derived which is used in the study of dynamic behaviour. The work is extended to cover sampled data a.g.c. systems and design guidelines are derived for a variety of situations. View full abstract»

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  • A new analysis of the transistor phase-shift oscillator

    Publication Year: 1963, Page(s):145 - 153
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (613 KB)

    The relationship between transistor parameters and circuit characteristics of an RC phase-shift oscillator is analysed by flow-graph and root-locus techniques. Exact formulae and approximations for the starting frequencies of three- and four-section RC phase-shift oscillators are derived. Prediction of the operating frequency for a given current gain is presented graphically and compared with expe... View full abstract»

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  • An algorithm to evaluate the logarithm of a number to base 2, in binary form

    Publication Year: 1969, Page(s):49 - 50
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    This algorithm evaluates, in binary form, log2N for a given value of N > 0 using steps which are easily reproduced by logic blocks. It is also possible to extend this to obtain 2x, the antilogarithm to base 2 of a given num ber x. View full abstract»

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  • Provision of moving target indication in an independent bistatic radar receiver

    Publication Year: 1984, Page(s):336 - 342
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1308 KB)

    The paper describes a technique for implementing moving target indication (m.t.i.) in an independent bistatic radar receiver. Conventional techniques for m.t.i., and the particular features and advantages of the bistatic radar configuration are also reviewed. The technique of phase priming by clutter echoes is suggested as a means for providing a coherent reference at the receiver, without need fo... View full abstract»

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  • Microwave semiconductor devices

    Publication Year: 1966, Page(s):329 - 341
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1629 KB)

    The paper examines some of the classes of microwave devices which are of current interest. Devices described are: frequency multipliers, up-converters, parametric amplifiers, tunnel diodes, backward diodes, hot electron devices and Gunn effect oscillators. Some of the problems and developments which the future may hold are discussed. View full abstract»

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  • Coherent and non-coherent demodulation of envelope-modulated radio signals. With particular reference to the enhanced-carrier system

    Publication Year: 1963, Page(s):65 - 71
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (765 KB)

    The ordinary ¿linear detector¿ and the coherent demodulator are briefly discussed as the two extreme cases of demodulators for envelopemodulated signals, since in the former the rectifier (or modulator) is switched by the complete input signal, while in the latter a pure local reference tone is used. The synchrodyne and enhanced-carrier systems are regarded as intermediate cases in which the swi... View full abstract»

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  • Electromagnetic theory of the leaky coaxial cable

    Publication Year: 1975, Page(s):233 - 240
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (807 KB)

    The transfer of electromagnetic fields through a grid made of conducting strips similar to the braid of a coaxial cable is expressed by means of a transfer surface impedance relating the tangential electric field to the discontinuity of the tangential magnetic field. This impedance is calculated as a function of the grid parameters. It is then used to establish the electromagnetic theory of a brai... View full abstract»

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  • The practical design of interdigital and comb-line filters

    Publication Year: 1967, Page(s):39 - 52
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1398 KB)

    The design procedures for interdigital and comb-line filters are summarized and the theory of these filters extended to include various aspects of design and performance which are not covered in the literature. The basic design equations are modified to give unified sets of expressions relating the resonator capacitances directly to the filter specification, and the theory of these filters is exte... View full abstract»

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  • Gaussian filters for pulse shaping

    Publication Year: 1971, Page(s):457 - 461
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (875 KB)

    Networks with approximately Gaussian insertion loss characteristics for the shaping and standardization of pulses used in B.B.C. television equipment have previously been designed by Dishal's method based on a Taylor series approximant. A proposal by Jones for an improved Gaussian approximant employing Laguerre polynomials suggested that more effective networks might be possible, Computer programs... View full abstract»

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  • Hazards to inflammable fuels and vapours due to induced microwave radiation

    Publication Year: 1976, Page(s):64 - 68
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (485 KB)

    Experimental results are presented for the minimum energy required for ignition of various gas/air mixtures in a microwave test cell. View full abstract»

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  • Corrugated conical horns with arbitrary corrugation depth

    Publication Year: 1973, Page(s):188 - 192
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (565 KB)

    The form of fields in a conical horn with uniform circumferential corrugations, when the corrugation depth assumes arbitrary values in the interval 0.25 ¿ (h/¿o0) ¿ 0.5 is investigated in this paper. Assuming the corrugations to be infinitely thin and sufficiently close-packed, an impedance boundary condition is imposed on the fields in the axial region. Subject to a far-field approximation, ac... View full abstract»

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  • Design considerations for ruze and rotman lenses

    Publication Year: 1982, Page(s):181 - 187
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (909 KB)

    Ruze and Rotman lenses are types of parallel-plate lens which can be used to form multiple beams for antenna arrays. An algebraic analysis is used to relate the different orders of phase aberration to the lens contours, and shows that lenses with zero second- and third-order aberrations can be designed. For a given array length and beam scan angle requirement, the analysis determines the minimum l... View full abstract»

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  • Absorption of sound in sea-water

    Publication Year: 1963, Page(s):493 - 500
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (788 KB)

    Laboratory and field data on the absorption of sound in sea- water are reviewed in the light of modern theory, including effects of pressure, temperature and salinity. The effects of temperature and MgSO4 salt concentration appear to be compatible from one investigator to another. There is some dispute, however, about the absolute value of the coefficient. The pressure effect has been measured for... View full abstract»

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  • Seeing in the dark

    Publication Year: 1972, Page(s):403 - 408
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1961 KB)

    A survey of the current state-of-the-art in night vision technology is presented, including both direct vision and low light-level television systems. Possible developments in thermal imaging techniques are discussed. View full abstract»

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  • The early history of amplitude modulation, sidebands and frequency-division-multiplex

    Publication Year: 1971, Page(s):43 - 47
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (742 KB)

    It is shown that the ideas of f.d.m. originated with Alexander Graham Bell around 1870 and were formulated as an f.d.m. telephone system by Leblanc in 1886. Amplitude modulation of a carrier by speech probably originated also with Leblanc in 1886. The existence of sidebands (or sidetones) was demonstrated experimentally by Mayer in 1875 and theoretically by Rayleigh in 1894, but was not known to t... View full abstract»

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  • Muscle substitutes and myo-electric control

    Publication Year: 1963, Page(s):439 - 448
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1956 KB)

    Muscle substitutes are defined and a description is given of some of those in use and under development. The possibility is suggested of controlling these devices by using the electrical potentials picked up over contracting muscles. Past experimental work in the field is discussed and the problems associated with it are described. Finally, the authors' experimental control system is described and... View full abstract»

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  • Engineering approach to the design of tapered dielectric-rod and horn antennas

    Publication Year: 1972, Page(s):251 - 259
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1203 KB)

    The taper profile of optimized dielectric-rod and horn antennas is synthesized as a series of non-interacting planar radiating apertures. The method is semi-empirical, straightforward to apply, enables the dielectric-rod antenna to be satisfactorily optimized and provides a means of evaluating and optimizing a dielectric-horn antenna with variable wall thickness. The optimum profiles are taken as ... View full abstract»

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  • Man-machine interaction in aerospace control systems

    Publication Year: 1980, Page(s):447 - 458
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1326 KB)

    The Multi-Role Combat Aircraft Tornado is probably the most spectacular example to date of a complex man-machine system in which design and manufacture are widely dispersed. Even sub-assemblies of this system are extremely complex relative to the technology of just a few years ago. This makes life extremely difficult for an engineer involved in the procurement of the sub-assembly, especially as th... View full abstract»

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  • Optimized low-insertion-loss millimetre-wave fin-line and metal insert filters

    Publication Year: 1982, Page(s):513 - 521
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1011 KB)

    Low passband insertion-loss is achieved (1) by large-gap fin-lines, by which the high-Q potential increasing with gap-width is fully utilized, and (2) by pure metal inserts mounted in the E-plane of rectangular waveguides requiring no supporting dielectrics. This design combines the advantages of low-cost etching techniques and the low-loss performance of usual waveguide circuits. The theory descr... View full abstract»

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  • Radar signal processing for angular resolution beyond the rayleigh limit

    Publication Year: 1967, Page(s):161 - 174
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1724 KB)

    The problem of angular resolution is formulated in a statistical decision theoretical context. A tutorial discussion of decision theory and its application to resolution is presented, and an explicit signal processing radar system is derived, the resolving properties of which approach an optimum. Computer simulation tests show that the system is capable of reliably resolving targets as close as a ... View full abstract»

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  • A high-speed, asynchronous, digital multiplier

    Publication Year: 1968, Page(s):357 - 365
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (862 KB)

    The digital multiplication of two numbers of any sign by the successive addition of partial products is critically examined for the purpose of reducing the time of computation. The theory of Booth's method is reviewed and extended to show its validity for use with numbers of any radix. Multiple digit multiplication algorithms can then be derived and the quaternary algorithm for the multiplication ... View full abstract»

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  • Series-parallel generation of m-sequences

    Publication Year: 1975, Page(s):171 - 176
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (705 KB)

    An equivalence class of machines is identified which generate maximal length sequences as a non-overlapping series of k-bit words. This is achieved at the expense of a k-fold increase in combinational logic but with no increase in the number of storage elements required. View full abstract»

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  • Design considerations for millimetre wave lens antennas

    Publication Year: 1982, Page(s):551 - 558
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (889 KB)

    The operational background and some of the possible single and dual lens antenna options for use in a millimetric sensor with approximately 3° beamwidth have been examined. A particular single lens antenna design gave a scan of more than ±3 beamwidths and compatibility with conical scan, beam broadening and monopulse operation. A dual lens antenna design was operated both with a single feed horn... View full abstract»

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  • Planar arrays with unequally spaced elements

    Publication Year: 1964, Page(s):173 - 184
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1222 KB)

    The application of the optimization technique known as dynamic programming to the design of thinned planar arrays with unequally spaced elements is described. Two different approaches were investigated. In one method the planar aperture was considered to consist of a number of concentric ring arrays and dynamic programming was applied to determining the radii of the rings which yielded radiation p... View full abstract»

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  • Applications of closed-loop stepping motor control in multi-motor systems

    Publication Year: 1984, Page(s):457 - 461
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (802 KB)

    Stepping motors, as digital machines, are commonly used in electromechanical systems since they can easily be interfaced to and controlled by computers. Electrical and mechanical interaction in multiple-motor systems, however, can lead to severe control problems, and in intelligent systems such as programmable XYtables, rotor position feedback from each machine is necessary to implement effective ... View full abstract»

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  • Improvements to a pulse compression radar matched filter

    Publication Year: 1983, Page(s):138 - 140
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (572 KB)

    A modification to the matched filter is developed that enables a pulse compression radar system with inherently low sidelobes to be achieved. The system is illustrated using a signal with a truncated Gaussian spectrum with TB = 1000 giving sidelobes of ¿46 dB, mis-match loss of 0.002 dB and moderate tolerance to Doppler shift. View full abstract»

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  • A simplified theory of the three-port junction ferrite circulator

    Publication Year: 1967, Page(s):283 - 288
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (518 KB)

    A simplified theory of the three-port junction circulator is given. This theory is applicable to all three-port junctions which rely on the splitting of a pair of degenerate modes and gives the two circulation conditions of the three-port junction circulator in terms of the elements of the equivalent shunt resonator. This is done by first developing the degenerate normal-mode description of the re... View full abstract»

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  • Radar signal loss resulting from sub-optimal phase quadrature processing

    Publication Year: 1977, Page(s):207 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (207 KB)

    The effective difference in sensitivity between two types of detection threshold is derived. They are a single threshold placed on the envelope of a complex signal, and a pair of thresholds placed on the modulus of each of the resolved quadrature components. It is shown that the loss which results for the sub-optimal case is acceptably small. View full abstract»

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  • Speech and vocoders

    Publication Year: 1970, Page(s):73 - 82
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1174 KB)

    Speech signals are produced by relatively slow articulatory movements. This suggests that the information rate of the speech signal is much less than would be expected by considering the bandwidth of the acoustic signal. Vocoders attempt to exploit the redundancy in the speech waveform by extracting and transmitting the information bearing parameters of the speech signal. At the receiver, these pa... View full abstract»

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  • Applications of the Taguchi gas sensor to alarms for inflammable gases

    Publication Year: 1974, Page(s):85 - 91
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (787 KB)

    In domestic, commercial, light industrial, and some recreational environments, there exists a requirement for the economical detection of potentially explosive concentrations of inflammable gases. The recently introduced Taguchi gas sensor, or T.G.S., is an inexpensive semiconductor transducer which is sensitive to all inflammable gases, and has electrical characteristics which appear to make it s... View full abstract»

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  • Dielectric loaded waveguides-a review of theoretical solutions. Part 2: Propagation through dielectric loaded waveguides

    Publication Year: 1965, Page(s):195 - 205
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (844 KB)

    The paper presents an analytical survey of the propagation characteristics of microwaves through (i) dielectric loaded waveguides, such as parallel plane, rectangular, circularly cylindrical and coaxial guides filled inhomogeneously with one or two dielectrics; (ii) imperfect waveguides filled with imperfect dielectrics. The problem of the existence of backward waves in a circular cylindrical wave... View full abstract»

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  • Dielectric loaded waveguides-a review of theoretical solutions. Part 3: The impedance approach to dielectric loaded waveguides

    Publication Year: 1965, Page(s):353 - 364
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1297 KB)

    Surface impedance, transverse and longitudinal impedances are defined in analogy with the circuit theory definition. The concept of wave impedance and its relation to orthogonality of electric and magnetic fields is discussed. It is shown that in the case of multi-mode transmission, the wave impedance is not unique. Wave impedances of E and H modes in dielectric-filled waveguides and different imp... View full abstract»

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  • Dielectric and conductivity measurements on thin liquid films of n-heptanol

    Publication Year: 1975, Page(s):401 - 408
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (824 KB)

    Measurements of permittivity, loss factor and of d.c. conductivity have been made on very thin films of n-heptanol in both purified and non-purified states. Clear evidence of interfacial polarization effects is found which are fitted to a single mobile charge carrier model. The Garton effect has been found in thin films between aluminium electrodes. It is concluded that the bulk polarization mecha... View full abstract»

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  • An electrodeless conductivity meter for process control

    Publication Year: 1963, Page(s):25 - 34
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1304 KB)

    First Page of the Article
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  • Analysis and control of the permanent-magnet stepper motor

    Publication Year: 1971, Page(s):302 - 308
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (779 KB)

    A stepper motor has the ability to translate digital signals into angular shaft positions. This paper deals with the dynamic characteristics of a 90° permanent magnet motor, when used to switch a load through a sequence of angular steps. The non-linear system equations are derived, and linearized versions of these equations are used to estimate the dynamic response for single-step operation. Mult... View full abstract»

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  • A high-gain multimode dielectric-coated rectangular horn antenna

    Publication Year: 1978, Page(s):439 - 443
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (413 KB)

    A broadband high-gain dielectric-coated horn antenna operating in two orthogonal TE10+TE/TM12 and TE01 + TE/TM21 mode sets to generate circularly polarized elliptical shaped beam is described. The aperture E-field distribution can be tapered by virtue of the higher order TE/TM modes to cause the E-plane far-field beamwidth approximately equal to H-plane beamwidth of the other orthogonal set of mod... View full abstract»

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  • An improved voltage variable resistor m.o.s.t.

    Publication Year: 1976, Page(s):350 - 354
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (475 KB)

    A method of designing enhancement-mode m.o.s.t.s having controllable turn-on characteristics is described. The m.o.s.t.s are specifically aimed at performing the functions of voltage-controlled resistors and the design called for a log-linear variation in channel resistance with gate voltage over as wide a range as possible. The devices were made using a conventional p-channel oxide gate process w... View full abstract»

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  • Conduction and magnetic signalling in the sea a background review

    Publication Year: 1972, Page(s):447 - 452
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (810 KB)

    Electromagnetic, conduction and magnetic induction techniques for communicating or navigating underwater are discussed in the light of some 75 published references. View full abstract»

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  • Amplitude performance of Ruze and Rotman lenses

    Publication Year: 1983, Page(s):329 - 336
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1363 KB)

    Ruze and Rotman lenses are devices which can be used to form multiple beams for antenna arrays. A previous paper has shown these lenses can be designed for low-phase aberrations and minimum size. Published work on these lenses has concentrated on phase and largely neglected amplitude performance (except Maybell). Here, a theoretical model is developed which predicts the primary amplitude distribut... View full abstract»

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  • The development of eddy-current testing techniques for tube inspection

    Publication Year: 1963, Page(s):373 - 382
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1892 KB)

    The paper outlines the need for a high speed method of examining tubes for defects and discusses to what extent eddy-current techniques meet this need. A short history is given of the introduction of eddy current testing used for the examination of solid and hollow cylinders. Eddy current testing principles are explained, together with methods of measuring the effects of variations in a test speci... View full abstract»

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  • The theory of coupling in a tapered waveguide

    Publication Year: 1973, Page(s):751 - 756
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (721 KB)

    A theory is given which enables the overall coupling between two modes to be calculatedfor a tapered waveguide, if the coupling factor between the modes, the phase constants of the modes, and the characteristic impedances of the waveguide for the two modes are known at all points along the taper. It is thus restricted to those cases where a characteristic impedance can be defined, i.e. waveguides ... View full abstract»

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  • A precision voltage-controlled time delay circuit

    Publication Year: 1967, Page(s):123 - 128
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (503 KB)

    A transistor circuit is described in which the time delay between a trigger pulse and the output pulse, is directly proportional to a control voltage over a 100 : 1 range. The delay circuit is synthesized from circuits performing the functions of ramp generation, voltage comparison and switching. The circuit uses matched dual planar transistors to achieve a temperature coefficient of 0.0025% per d... View full abstract»

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  • A true i.f. logarithmic amplifier using twin-gain stages

    Publication Year: 1966, Page(s):149 - 155
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (682 KB)

    A true i.f. logarithmic amplifier is described which avoids the successive detection principle and its associated video delay line. Each stage comprises a pair of long-tailed pairs in a complementary role. Transistors are used throughout but `bottoming¿ is avoided, and bandwidth variations are negligible. A dynamic range of about 100 dB is possible. A video output may be derived if desired from a... View full abstract»

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  • Design of stepped microstrip components

    Publication Year: 1978, Page(s):53 - 63
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1042 KB)

    The analysis of the impedance step by the mode matching procedure using a waveguide model for the microstrip line yields an explicit design formula for the frequency-dependent equivalent series inductance. The single-section quarter-wavelength transformer is calculated under the assumption of interacting steps. It turns out that in regard to practical design the neighbouring steps can be considere... View full abstract»

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  • X-band microwave integrated circuits using slotline and coplanar waveguide

    Publication Year: 1978, Page(s):38 - 42
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (985 KB)

    Experimental results are given for propagation in a selection of slotline and coplanar geometries. Examples are given of X-band planar circuits incorporating semiconductors including balanced mixers, and p-i-n-diode switches and attenuators. Finally, an example of how slotline dipoles may be used to produce a simple aerial array is presented. View full abstract»

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  • The dynamic capacitor electrometer

    Publication Year: 1965, Page(s):37 - 45
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1043 KB)

    The theory, historical development, design and construction of the dynamic capacitor electrometer are discussed. Both reed and diaphragm types are considered. Circuits are given and techniques of pH measurement described briefly. View full abstract»

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  • Impulsive noise reduction in radio receivers

    Publication Year: 1973, Page(s):341 - 347
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    The spectrum of impulsive noise is quite different from that of an a.m. or s.s.b. radio signal, but receivers designed to discriminate against the former have only been moderately successful. A mathematical analysis of a noise blanking receiver demonstrates the critical nature of system parameters. Signals in adjacent channels can give rise to excess noise in the wanted channel. Trapezoidal blanki... View full abstract»

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  • The significance of nullators, norators and nullors in active-network theory

    Publication Year: 1967, Page(s):259 - 267
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (814 KB)

    Although proposed in 1961, the nullator and norator have not been widely used or understood. At first sight these elements appear rather remote from reality, and in this paper an attempt is made to relate them to some practical devices. It is suggested that a nullator-norator pair (nullor) may be regarded as a reasonable idealization of a number of physical devices, but that the nullator and norat... View full abstract»

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  • Optimizing non-recursive digital filters to non-liner phase characteristics

    Publication Year: 1974, Page(s):645 - 651
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (564 KB)

    Various methods based on optimization have been used to design linear phase filters. One such method has been to use a general-purpose optimization program to minimize some error criterion, a function of the filter coefficients and of the error between the specified and achieved gain responses. However, if this were to be used with arbitrary phase designs, the error criterion would have to be form... View full abstract»

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