A variable time-equalizer for video-frequency waveform correction

Linke, J.M.

doi:10.1049/jiee-2.1953.0035

Cited by 9 publications

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“…3, MARCH 1967 applications has been tp variable echo waveform correction. 7 Here, we are only interested in its gain/frequency response.…”

Section: U N = C N Eexp{-j(n-l)b}jmentioning

confidence: 99%

Residual attenuation equalisation of broadband systems by generalised transversal networks

Linke

1967

Proc. Inst. Electr. Eng. UK

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SynopsisResidual attenuation equalisation of broadband coaxial-cable systems has been achieved elsewhere by a set of harmonic cosine characteristics based on an almost linear frequency scale. This method is, however, not efficient for systems which exhibit high distortion near the bandedges. A simple analysis of measured characteristics yields the requirements for suitably transforming, or 'warping', the frequency scale. Generalisations of the transversal-equaliser principle offer the realisation of cosine characteristics with frequency scales which match particular problems. The investigation on which the paper is based was concerned with the coaxial-cable network of the British Post Office, and led to novel designs, of which the 'twin cosine equaliser' has been accepted for service use. This device enables residual distortion of up to 6dB to be reduced to rather less than 1 dB, with a minimum of auxiliary instrumentation. List of symbolsa, b, c = coefficients m, r, s, u,v = indexes v = integer n = order oil = Irfi = lower frequency limit of system a> h = 277-//, = upper frequency limit of system a>1 ~~ J 7 ''} > = limits of approximation interval o; 2 = 277/ 2 J co 0 , 00 r = reference frequenciesx(f) = transformation ('warping') of frequency scale y = normalised frequency F(x) = function to be approximated S n = trigonometric sum of nth order S n = truncated Fourier series of nth order M(d) = modulus of convergence d = limit to modulus of increment of variable /difference or differential quotient Islope of polygon side = constant in Jackson's theorem = quantisation step q = upper limit to equalisation error, dB A + jB = propagation coefficient A o = In k = flat loss of variable equaliser R = resistance W = characteristic impedance K = impedance ratio N = number of components E, U = signal amplitudes T = time constant G(co) = transfer function (output/input ratio) m = shape parameter (j) af (f) b = pair of quadrature phase-shift functions

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“…3, MARCH 1967 applications has been tp variable echo waveform correction. 7 Here, we are only interested in its gain/frequency response.…”

Section: U N = C N Eexp{-j(n-l)b}jmentioning

confidence: 99%

Residual attenuation equalisation of broadband systems by generalised transversal networks

Linke

1967

Proc. Inst. Electr. Eng. UK

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Some remarks on the Raman spectrum of solid phosphorus pentachloride

Gerding

Houtgraaf

1955

Recl. Trav. Chim. Pays‐Bas

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(Contribution from the laboratory for prop. inorganic chemistry and from the laboratory for general and inorganic chemistry of the University of Amsterdam).Powell C.S. deduced from an X-ray study that solid PQ, has to be considered as [PCI,+] [PCI,-1. From the distances between P and Q in XI,+ and in PCl, , -given by the authors, force constants fPa4+ and f P a e have been calculated using Badger's rule. From these f values and by a comparison with the results of a similar calculation for SiQ, it follows that the strongest lines of the Raman spectrum of PQ,, namely 358(15) and 451 (7), belong to Y,(PCI,-) and yI(PClr+) respectively. With these frequencies known, it is possible to make an estimate of the frequencies to be expected for the other Raman-active vibrations of both ions. A probable assignment of Raman shifts to vibrations of XI,+ and PC16-is given. Introduction.

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Concepts of Organization the Leverage of Ciliate Protozoa

Sapp

1991

A Conceptual History of Modern Embryology

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A variable time-equalizer for video-frequency waveform correction

Cited by 9 publications

References 0 publications

Residual attenuation equalisation of broadband systems by generalised transversal networks

Residual attenuation equalisation of broadband systems by generalised transversal networks

Some remarks on the Raman spectrum of solid phosphorus pentachloride

Concepts of Organization the Leverage of Ciliate Protozoa

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