H - Electricity – 03 – H
Patent
H - Electricity
03
H
H03H 7/12 (2006.01) G01R 23/165 (2006.01) H04N 17/00 (2006.01)
Patent
CA 2353028
A selectable band-pass filtering apparatus for use at the input of analysis instrumentation such as a spectrum analyzer for testing a multi-channel communication system, comprises a high-pass filter section including a plurality of separate high-pass filters each characterized by a respective high-pass cut- off frequency within a predetermined input frequency spectrum characterizing the communication system. The apparatus further comprises a low-pass filter section including a plurality of separate low-pass filters each characterized by a corresponding low-pass cut-off frequency within the input frequency spectrum. The apparatus further switching devices capable of connecting a selected high- pass filter in series with a selected low-pass filter, to select a passband having center frequency and bandwidth characteristics defined by corresponding high-pass cut-off frequency and said low-pass cut-off frequency. The selected passband characteristics correspond to one or more selected channels used by the communication system, in a such way that the so connected filters generate a band-pass filtered communication signal corresponding to the selected channels. A manually or electronically operated control device is provided for operating the switching devices according to the selected filters. The apparatus can be build in the form of a portable, pocket-size instrument for field testing, or integrated within a spectrum analyzer. Related methods for selectively band- pass filtering an electrical signal, selectively band-pass filtering a communication signal to be fed to a spectrum analyzer for testing a multi-channel communication system and for spectrally analyzing a communication signal supplied by a multi-channel communication system, are presented.
Avantron Technologies Inc.
Smiths Ip
Sunrise Telecom Incorporated
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