Sequence generator having amplitudes and phases of spectral comp

Details Sequence generator having amplitudes and phases of spectral comp Sequence generator having amplitudes and phases of spectral comp

Filed on

1977-01-06

Date issued

1978-03-07

Examiner

Malzahn, David H.

Patent Class

Boots, shoes, and leggings

Other Related Categories

331 78, G06F 102

Type

Patent

Status

active

Patent number

040782557

Description

ABSTRACT:
An improved noise loading arrangement and method are disclosed capable of measuring low intensity intermodulation distortion products, such as introduced in the operation of individual wideband transmission repeaters. The improved arrangement and method also have the further capability of resolving individual orders of distortion products. The arrangement utilizes a noise signal generator that produces a pseudorandom signal made of several spectral components providing high spectral density throughout a large bandwidth to simulate a broadband message load obtained by frequency multiplexing several independent signal sources. The noise signal is shifted in frequency before a quiet band is produced in the signal applied to the transmission apparatus to be tested. The orders of intermodulation distortion products appearing in the quiet band of the output signal of the transmission apparatus are individually measured to evaluate same. Automation of the test sequence is provided by a computer which acts as a general controller. The computer also processes the test data obtained by using a conventional signal averaging technique.

REFERENCES:
patent: 3366779 (1968-01-01), Catherall et al.
patent: 3742381 (1973-06-01), Hurd
patent: 3761696 (1973-09-01), Russell
patent: 3885139 (1975-05-01), Hurd
J. A. Coekin et al., "The Generation of Pseudo-Random Binary Sequences for Testing Very Wide Band Systems" Electronic Instrumentation Conference, Hobart, Australia, May 17-19, 1972, pp. 123-129.

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