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Distortion Meter

IP.com Disclosure Number: IPCOM000092440D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Monrolin, J: AUTHOR

Abstract

This device measures the distortion of a transmission system. By sending a pulse signal through the transmission line, the response signal is gamma and this signal is sampled at time T = 1/2F, F being the transmission range of the line. The sampled signal can be represented by a polynomial (Image Omitted)

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Distortion Meter

This device measures the distortion of a transmission system. By sending a pulse signal through the transmission line, the response signal is gamma and this signal is sampled at time T = 1/2F, F being the transmission range of the line. The sampled signal can be represented by a polynomial

(Image Omitted)

As the input bit pattern is at random, one bit pattern gives the sum of all disturbing values from a(i) except a(0).

The pulse response being timed out (the absolute value of a/N/ < epsilon) after a time NT, it is possible to send on the line a periodic signal the period YT which is superior to NT. In such case, the disturbing effect can be defined by

(Image Omitted)

If delta is the sampling duration, T is the time interval between zero crossing and YT is the recurrence of the signal. In a period YT, the average value of a(i) is a(i) = delta/YT a(i).

Consequently, it is useful to quantize a(i) in a period T. In such a case

The received signal gamma, amplified by A, is received by rectifier R1. Threshold trigger T, triggered by the part of T having amplitude M, turns on the sampling system. The latter comprises clock CL which operates during all sampling times jT, logic circuits LG which produce pulses alpha at jT intervals without j'T when gamma = M, and the sampling device SA. Delays theta and D allow such signal to arrive at sampling system, when the latter is properly synchronized. At the output O of sigma, there are analog elements a(i), the...