公开(公告)号：DE69319942T2

公开(公告)日：1998-12-17

申请号：DE69319942

申请日：1993-02-12

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04M1/31 ,  H04M1/74 ,  H04M19/04

Abstract: An acoustic feedback suppression device, particularly for auxiliary ringers in plug-in telephone systems, includes diodes (17,18) in addition to a rectifier bridge (11) of the ringer (14). The circuit provides direct-current decoupling and limits the AC voltage present across the auxiliary ringer.

公开(公告)号：ITMI920336A1

公开(公告)日：1993-08-18

申请号：ITMI920336

申请日：1992-02-17

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： ANTONINI CARLO ,  CONSIGLIO PIETRO

IPC: H04M1/31 ,  H04M20060101 ,  H04M1/74 ,  H04M19/04

公开(公告)号：IT9022061A1

公开(公告)日：1992-05-16

申请号：IT2206190

申请日：1990-11-15

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： ANTONINI CARLO ,  CONSIGLIO PIETRO

IPC: H04B3/14 ,  H04L5/14 ,  H04M20060101

公开(公告)号：DE69125686T2

公开(公告)日：1997-07-24

申请号：DE69125686

申请日：1991-11-11

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04B3/14 ,  H04L5/14

公开(公告)号：IT9022062A1

公开(公告)日：1992-05-16

申请号：IT2206290

申请日：1990-11-15

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： ANTONINI CARLO ,  CONSIGLIO PIETRO

IPC: H04M20060101 ,  H04M1/31 ,  H04M1/82

公开(公告)号：ITMI920336D0

公开(公告)日：1992-02-17

申请号：ITMI920336

申请日：1992-02-17

Applicant: ST MICROELECTRONICS SRL ,  SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04M1/31 ,  H04M1/74 ,  H04M19/04 ,  G01R3/00 ,  H04M

Abstract: An acoustic feedback suppression device, particularly for auxiliary ringers in plug-in telephone systems, includes diodes (17,18) in addition to a rectifier bridge (11) of the ringer (14). The circuit provides direct-current decoupling and limits the AC voltage present across the auxiliary ringer.

公开(公告)号：IT9022061D0

公开(公告)日：1990-11-15

申请号：IT2206190

申请日：1990-11-15

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04B3/14 ,  H04L5/14 ,  H02M7/00

公开(公告)号：DE69129785T2

公开(公告)日：1999-03-25

申请号：DE69129785

申请日：1991-11-11

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04M1/31 ,  H04M1/82 ,  H04M1/08

公开(公告)号：DE69125686D1

公开(公告)日：1997-05-22

申请号：DE69125686

申请日：1991-11-11

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04B3/14 ,  H04L5/14

公开(公告)号：IT1268475B1

公开(公告)日：1997-03-04

申请号：ITVA930027

申请日：1993-11-12

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H03G5/16 ,  H02J7/00 ,  H03F1/32 ,  H04M1/60

Abstract: Distorsion control in a push-pull output stage of a speech amplifier of a telephone powered through the telephone line is more effectively and advantageously implemented by independently sensing an eventual state of saturation reached by any of the two output transistors (PWH,PWL) of the amplifier, summing the current signals ( epsilon ) representative of the sensed state of saturation of either or both output transistors, integrating (RC) the resulting sum current signal to produce a DC signal and using the DC signal for activating an AGC loop. The DC signal indiscriminately accounts for any cause of saturation, though virtually representing the level of the amplified AC signal. Distorsion may be controlled without penalizing output voltage swing and power consumption.