Circuit arrangement for frequency analysis of received signals which lie in a wide overall frequency band

US4757253A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• August Weber · Germering, DE
• Erich Mayerhofer · Taufkirchen, DE
• Klaus Weis · Schwanau, DE
• Guenter Beyer · Gilching, DE

Key dates

• Filing date: Nov 17, 1977
• Grant date: Jul 12, 1988
• Expiry date: Nov 17, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/585
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuit arrangement for a frequency-dependent analysis of received signals which lie in a wide overall frequency band utilizes a filter bank which cooperates with an evaluation circuit. The filter bank has frequency-dependent band filters connected thereto and comprises an evaluation frequency range which exhibits only a few small band width in relation to the overall frequency band. The received signals are processed by means of a filter circuit having adjoining pass ranges, the signals being modulated by a number of frequency modulators into an evaluation frequency range and an addition of the individual heterodyning frequency values is performed. The frequency-dependent successive partial frequency bands of the received signals, after conversion in the filter circuit, are respectively connected to another of two transmission channels in such a manner that the first transmission channel only transmits the even numbered partial frequency bands in the frequency-dependent succession, and the second transmission channel only transmits the uneven numbered partial frequency bands in the frequency-dependent succession. The transmission channels are coupled to one of two respective equ…