Subscriber line interface circuitry with common base audio...

Details Subscriber line interface circuitry with common base audio... Subscriber line interface circuitry with common base audio...

2006-03-31

2009-02-03

Singh, Ramnandan (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

Reexamination Certificate

active

07486787

ABSTRACT:
Methods and apparatus for coupling outgoing analog audio signals to a subscriber line are described. One method includes the step of receiving the outgoing audio signal. The outgoing audio signal is coupled to the subscriber line through a plurality of transistors coupled in a common base configuration. In one embodiment, linefeed driver control signals for controlling battery feed to the subscriber line are received on the same signal lines as the outgoing audio signal. A subscriber line interface circuit apparatus includes a first circuit for coupling a received outgoing audio signal to a subscriber line. The first circuit couples the received outgoing audio signal to the subscriber line through a common base isolation stage. In various embodiments, the common base isolation stage comprises a plurality of bipolar junction transistors coupled in a common base configuration or a plurality of field effect transistors coupled in a common gate configuration.

REFERENCES:
patent: 4151482 (1979-04-01), Robe
patent: 4284958 (1981-08-01), Pryor et al.
patent: 4609781 (1986-09-01), Gay
patent: 4709388 (1987-11-01), Defretin
patent: 4827505 (1989-05-01), Takato et al.
patent: 4866767 (1989-09-01), Tanimoto et al.
patent: 4984266 (1991-01-01), Smith
patent: 5175764 (1992-12-01), Patel et al.
patent: 5182745 (1993-01-01), Heichler
patent: 5274702 (1993-12-01), Rosch et al.
patent: 5323460 (1994-06-01), Warner et al.
patent: 5528682 (1996-06-01), Cotreay
patent: 5659608 (1997-08-01), Stiefel
patent: 5721774 (1998-02-01), Stiefel
patent: 5745563 (1998-04-01), Prentice
patent: 5828748 (1998-10-01), Akhteruzzaman
patent: 5848149 (1998-12-01), Chen et al.
patent: 5854550 (1998-12-01), Knollman
patent: 5878133 (1999-03-01), Zhou et al.
patent: 5881129 (1999-03-01), Chen et al.
patent: 5926544 (1999-07-01), Zhou
patent: 6178241 (2001-01-01), Zhou
patent: 6219417 (2001-04-01), Zhou
patent: 6263015 (2001-07-01), Awata et al.
patent: 6263016 (2001-07-01), Bellenger et al.
patent: 6301358 (2001-10-01), Chen et al.
patent: 6615027 (2003-09-01), Sahota et al.
patent: 6934384 (2005-08-01), Hein
patent: 7180999 (2007-02-01), Hein et al.
patent: 2032730 (1980-05-01), None
Advanced Micro Devices, “Am7920: Subscriber Line Interface Circuit Preliminary Datasheet,” Publication #19239, Rev. E, Jul. 1998.
Advanced Micro Devices, “Am79213/Am79C203/031: Advanced Subscriber Line Interface Circuit (ASLIC™) Device/Advanced Subscriber Line Audio-Processing Circuit (ASLAC™) Device Preliminary Datasheet,” Publication #19770, Rev. B, Sep. 1998.
Advanced Micro Devices, “Am79231: Intelligent Subscriber Line Interface Circuit (ISLIC™) Advance Information Datasheet,” Publication #22419, Rev. A, Sep. 1998.
Advanced Micro Devices, “Am79Q2241/2242/2243: Quad Intelligent Subscriber Line Audio-Processing Circuit (ISLAC™) Advance Information Datasheet,” Publication #22421, Rev. A, Sep. 1998.
Advanced Micro Devices, “Am79R241: Intelligent Subscriber Line Interface Circuit (ISLIC™) Advance Information Datasheet,” Publication #22420, Rev. A, Sep. 1998.
Advanced Micro Devices, “Am79R79: Ringing SLIC Device Technical Overview Application Note,” Publication #19768, Rev. B, May 1997.
Lucent Technologies, “L8576 Dual Ringing SLIC Preliminary Datasheet,” Mar. 1998.
SGS-Thomson Microelectronics, “L3000N/L3030 Subscriber Line Interface Kit Preliminary Data,” Jan. 1995.
SGS-Thomson Microelectronics, “L3000S/L3030 Subscriber Line Interface Kit Preliminary Data,” Jun. 1997.
SGS-Thomson Microelectronics, “L3037 Subscriber Line Interface Circuit,” Dec. 1997.
SGS-Thomson Microelectronics, “SGS-Thomson SLIC AC Models Application Note,” 1995.
Goodenough, F., “SLIC Ejects Relays From PABX Line Cards”, Electronic Design, vol. 42, No. 14, Jul. 11, 1994, pp. 55-56, 58-59, 62-64, Penton Publishing, Cleveland, Ohio.

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