H - Electricity – 03 – H
Patent
H - Electricity
03
H
354/70, 333/80,
H03H 17/00 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1233254
ABSTRACT This concerns a circuit for generating a desired two terminal impedance at two terminals which involves guiding analog signals appearing at the two terminals into an analog digital converter, supplying the output there- from to a digital processing circuit, leading the outputs therefrom to a digital analog converter, and connecting the output therefrom to the two terminals to form a feed-back loop, so that the digital processing circuit processes with a desired transfer function. The circuit of the invention is characterized in that an analog processing circuit is provided which receives the analog signals appearing at the two terminals as input and which passes frequencies higher than the frequencies processed in the digital processing circuit. The output of the analog processing circuit is connected to the two terminals to form another feed-back loop, and the higher frequency is led to pass through the analog processing circuit instead of the digital processing circuit to lower the frequencies to be processed in the digital processing circuit, thus permitting use of a less costly digital processing circuit.
449307
Hayashi Toshio
Maeda Youichi
Fetherstonhaugh & Co.
Nippon Telegraph And Telephone Corporation
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