公开(公告)号：DE2518885A1

公开(公告)日：1975-11-13

申请号：DE2518885

申请日：1975-04-28

Applicant: CIT ALCATEL

Inventor： BOYER MARCEL-LOUIS ,  STENSTROM CLAUDE ,  MINARD FRANCIS

IPC: H04J1/05 ,  H04J1/08 ,  H04L5/06 ,  H04L27/00

公开(公告)号：FR2283593A1

公开(公告)日：1976-03-26

申请号：FR7426597

申请日：1974-07-31

Applicant: CIT ALCATEL

Inventor： AMEAU ALBERT ,  STENSTROM CLAUDE ,  MINARD FRANCIS

IPC: H03K9/06

Abstract: The digital demodulator is for transmissions modulated in phase or frequency by a data source. The design is intended to simplify the complex filter system normally associated with demultiplexing transmissions carried on post office telephone lines. An analogue to digital converter (3) is followed by a discriminator circuit (T) feeding an output demultiplexing stage, the three major stages being preceeded by an input level regulator and a band pass filter with a cut-off at 4KHz. The discriminator has three basic units, a computing circuit providing a discrimination signal for each route, an equalising band pass filter and a sampling type unit reproducing the telegraphy signals.