Peretz MERON - Academia.edu (original) (raw)

Papers by Peretz MERON

Journal of the Optical Society of America, 1983

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1974

The impulse-invariant equivalent digital versions of second-order bandpass analog filters are sta... more The impulse-invariant equivalent digital versions of second-order bandpass analog filters are stable only for coefficients within specific ranges. The quantization of these coefficients may thus cause an originally stable filter to become unstable; the sensitivity of the digital filter to such changes is found to depend on the sampling frequency. Analytic and graphical design techniques are developed for determining the range of sampling frequency that, with a predetermined register length for the coefficients, renders the digital equivalent of a tuned circuit always stable. A comparison is also made between instability caused by quantization of coefficients and limit cycles resulting from the rounding of products.

Optics Communications, 1981

Abstract An evaluation of ray trajectories near a dielectric interface indicates that high order ... more Abstract An evaluation of ray trajectories near a dielectric interface indicates that high order modes in step-index fibers are more affected by losses and imperfections existing at the interface region and beyond, than low order modes.

Proceedings of MILCOM '94, 1994

ABSTRACT Compressed video data comes with a problem of sensitivity to channel errors. As a result... more ABSTRACT Compressed video data comes with a problem of sensitivity to channel errors. As a result, error resilience capability is very important for video expanders. We describe a variety of error concealment techniques which give a video compression algorithm the robustness it needs while operating in noisy channels. For the sake of simplicity, the principles of the video compression algorithm which we use are based on the MPEG algorithm. The major error concealment techniques discussed are correlation sequences to avoid error propagation, error correcting codes to protect very sensitive data, replacement of damaged data by other kind of data, when this is possible and using error detection codes to detect errors on sensitive data. In addition to that, sensitive data interleaving is used for the data protected by error correcting codes (ECC), to make the ECC decoding much more efficient. We also show a generic relation between the optimum channel bit rate and the given channel BER

International Journal of Electronics, 1974

The effects of utilizing physical devices for the realization of active; band-pass filter section... more The effects of utilizing physical devices for the realization of active; band-pass filter sections which were designed with the aid of idealized mathematical models, are investigated. The assumptions made are pertinent to low-power drain requirements.The complete feasible range of component values is derived, showing that a. certain common arbitrary choice is, from some aspects, not optimal, nor is it always) feasible at all.The optimal choice from the viewpoint of imperfect amplifier usage and from that of passive element variation may or may not coincide, depending on the filter requirements ω0, A0 and Q. In any case, the designer in supplied with formulae in close form to choose optimally the component values with respect to these or another design criteria.Given an actual amplifier, upper bounds are derived, in a special case of interest, for the filter requirements which will not cause deviations larger than a prescribed percentage. Deviations due to passive element variations are also bounded, as a function of the maximum relative variations ΔR/R and ΔC/C, by a ‘ worst case ’ consideration.

Optical and Quantum Electronics, 1984

Optical equalization was suggested as a means for increasing the bandwidth of optical fibre commu... more Optical equalization was suggested as a means for increasing the bandwidth of optical fibre communication links when non-optimal graded-index fibre profiles are available. In this paper it is shown that by proper choice of the length as well as of the index of the compensating fibre one can significantly increase the bandwidth capability of the link. An upper limit of this improvement is derived, which is much larger than that obtained with alternating fibres of equal lengths.

Applied Optics, 1983

Mode conversion at splices of multimode optical fibers with power-law graded-index is investigate... more Mode conversion at splices of multimode optical fibers with power-law graded-index is investigated. With the assumption that the multitude of modes may be regarded to be a continuum, the boundary value problem is approximated by a geometric analysis, which eases the interpretation of mode splitting at splices. Although the approximation is not rigorous it provides a new approach for the determination of mode splitting at splices, generating results supported by published data. These results are used to verify the realizability of the optical equalization technique.

Compressed video data comes with a problem of sensitivity to channel errors [l]. As a result, err... more Compressed video data comes with a problem of sensitivity to channel errors [l]. As a result, error resilience capability is very important for video expanders.

in the design of active filters with particular reference to micro power requirements", int.