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37 records (took 0.025 seconds)

    14.
    发明专利
    未知

    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.

    17.
    发明专利
    未知

    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.

    18.
    发明专利
    未知

    公开(公告)号：ITVA930027A1

    公开(公告)日：1995-05-12

    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.

    20.
    发明专利
    未知

    公开(公告)号：ITVA930027D0

    公开(公告)日：1993-11-12

    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.

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