公开(公告)号：DE69532885D1

公开(公告)日：2004-05-19

申请号：DE69532885

申请日：1995-07-28

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

IPC: H04M1/74 ,  H04M19/04

Abstract: An acoustic feedback suppression system, particularly for auxiliary ringers in socket telephone systems, comprising a first terminal (L1) and a second terminal (L2) of a telephone line, an internal ringer (9), and an auxiliary ringer (50) that is connected between said first and said second telephone lines; the particularity of the system is that it comprises activation means (12, 13) adapted to activate first (15) and second (16) switching means that reduce the voltage at the terminals of the auxiliary ringer (50), the activation means (12, 13) being controlled by an activation signal (14) generated by call, control, and signalling means (2) when a user dials a telephone number.

公开(公告)号：DE69231822T2

公开(公告)日：2001-12-13

申请号：DE69231822

申请日：1992-12-30

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO ,  VANALLI GIANPIETRO

IPC: H04M1/00 ,  H04M1/60 ,  H04M1/738

Abstract: A telephone subscriber system comprising a speech circuit (SPC) and a ring circuit (RIN) adapted to be integrated monolithically to a semiconductor material substrate (G) and being coupled to a telephone subscriber line (SL), respectively through first (PP) and second (PR) circuit means of the diode bridge type, further comprises a first circuit changeover means (SW1), under control by the user, which drives at least second (SW2) and third (SW3) circuit changeover means connected between the first diode bridge circuit (PP) and the speech circuit (SPC). The third circuit changeover means (SW3) is connected to the speech and ring circuits at a circuit communication node (G) which forms the system point of reference, physically coincident with the substrate. The system includes a circuit interface means (CL) for controlling the second (SW2) and third (SW3) circuit changeover means by external electrical signals which are related to the circuit communication node (G). Said circuit interface means (CL) comprises a diode (D1) connected with its cathode to the circuit communication node (G), in parallel with the third circuit changeover means (SW3).

公开(公告)号：DE69231822D1

公开(公告)日：2001-06-13

申请号：DE69231822

申请日：1992-12-30

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO ,  VANALLI GIANPIETRO

IPC: H04M1/00 ,  H04M1/60 ,  H04M1/738

Abstract: A telephone subscriber system comprising a speech circuit (SPC) and a ring circuit (RIN) adapted to be integrated monolithically to a semiconductor material substrate (G) and being coupled to a telephone subscriber line (SL), respectively through first (PP) and second (PR) circuit means of the diode bridge type, further comprises a first circuit changeover means (SW1), under control by the user, which drives at least second (SW2) and third (SW3) circuit changeover means connected between the first diode bridge circuit (PP) and the speech circuit (SPC). The third circuit changeover means (SW3) is connected to the speech and ring circuits at a circuit communication node (G) which forms the system point of reference, physically coincident with the substrate. The system includes a circuit interface means (CL) for controlling the second (SW2) and third (SW3) circuit changeover means by external electrical signals which are related to the circuit communication node (G). Said circuit interface means (CL) comprises a diode (D1) connected with its cathode to the circuit communication node (G), in parallel with the third circuit changeover means (SW3).

公开(公告)号：DE69323101D1

公开(公告)日：1999-03-04

申请号：DE69323101

申请日：1993-02-12

Applicant: ST MICROELECTRONICS SRL

Inventor： ANDREINI ANTONIO ,  CONSIGLIO PIETRO ,  ERRATICO PIETRO ,  RAVANELLI ENRICO MARIA ALFONSO

IPC: H04M1/00 ,  H04M1/31 ,  H04M1/74 ,  H04M1/82 ,  H04M1/08

公开(公告)号：DE69323101T2

公开(公告)日：1999-06-02

申请号：DE69323101

申请日：1993-02-12

Applicant: ST MICROELECTRONICS SRL

Inventor： ANDREINI ANTONIO ,  CONSIGLIO PIETRO ,  ERRATICO PIETRO ,  RAVANELLI ENRICO MARIA ALFONSO

IPC: H04M1/00 ,  H04M1/31 ,  H04M1/74 ,  H04M1/82 ,  H04M1/08

公开(公告)号：DE69319942D1

公开(公告)日：1998-09-03

申请号：DE69319942

申请日：1993-02-12

Applicant: ST MICROELECTRONICS SRL

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：IT1254795B

公开(公告)日：1995-10-11

申请号：ITMI920336

申请日：1992-02-17

Applicant: ST MICROELECTRONICS SRL

Inventor： CONSIGLIO PIETRO ,  ANTONINI CARLO

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