Filters comprising reactive components, and a method of determin

Details Filters comprising reactive components, and a method of determin Filters comprising reactive components, and a method of determin

1981-12-23

1984-04-17

Pitts, Harold I.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

179 2DP, 333 32, H04M 1100, H03H 500

Patent

active

044436629

ABSTRACT:
A filter comprising reactive components which define pass and stop bands has the impedances of the components selected to minimize the sum .vertline.Zin-Z2.vertline.+.vertline.Zout-Z1.vertline. in the pass band, where Zin and Zout are respectively the input and output impedances of the filter and Z1 and Z2 are nominal termination impedance at respectively the input and output of the filter. The filter characteristic in the pass band is thereby made substantially independent of the actual termination impedances of the filter in use. The design is exemplified by a 5th order low pass filter for connection in the voice signal path of a telephone subscriber line.

REFERENCES:
patent: 1752461 (1930-04-01), Shea
patent: 3132313 (1964-05-01), Alford
patent: 3987375 (1976-10-01), May et al.
Electrical Communication, vol. 36, No. 1, 1959, pp. 3-26, "Gaussian Response Filter Design", Dishal.
IRE Transactions on Circuit Theory, pp. 284-327, Dec. 1958, "On The Design of Filters by Synthesis", Saal and Ulbrich.
"FILSYN-A General Purpose Filter Synthesis Program" by G. Szentirmai, Proc. IEEE, vol. 65, No. 10, Oct. 1977, pp. 1443 to 1458.
"SCAMPER"-Telesis, vol. 7, No. 3, 1980, pp. 2 to 9.

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