Title:
LOW PASS FILTER FOR TELEPHONE BAND
Document Type and Number:
Japanese Patent JPS54134952
Kind Code:
A
Abstract:
The invention relates to telephone band low-pass filters for use in demodulating PCM. Such filters are formed by two sections (1, 2) connected in cascade, each section including an operational amplifier (A1, A2). A first section is of the low-pass type whose loss at high frequencies is at least 6dB/octave; the second section is a second order asymmetrical notch network with a Cauer response characteristic: the second section may comprise, for example, a double tapped bridge and an operational amplifier.
Inventors:
JIERAARU BAARU
JIYATSUKU BOODAN
JIYATSUKU BOODAN
Application Number:
JP3680979A
Publication Date:
October 19, 1979
Filing Date:
March 28, 1979
Export Citation:
Assignee:
CIT ALCATEL
International Classes:
H03H11/12; H03H19/00; (IPC1-7): H03H7/02