Scott H Early

US Patent:

43396321, Jul 13, 1982

Filed:

Nov 26, 1980

Appl. No.:

6/210673

Inventors:

Scott H. Early - Indianapolis IN
David M. Savidge - Indianapolis IN

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

H04M 1274
H04M 102

US Classification:

179 90B

Abstract:

A display illuminating circuit for a repertory dialer telephone set allows for a subscriber to operate a desired repertory button in low ambient light emergency situations. The circuit illuminates the desired buttons by distinguishable colors of light-emitting elements. Activation of the illumination circuit occurs in response to the telephone set going off-hook and then only for a limited period to conserve battery life. A battery voltage monitoring arrangement provides an indication when a local battery needs to be replaced. In response to an activation signal provided by the voltage monitoring arrangement, the light-emitting elements flash at a level that is detectable by the subscriber going off-hook even in normal ambient light conditions.

US Patent:

45545154, Nov 19, 1985

Filed:

Jul 6, 1984

Appl. No.:

6/628582

Inventors:

Kyle L. Burson - Indianapolis IN
Scott H. Early - Indianapolis IN

Assignee:

AT&T Laboratories - Murray Hill NJ

International Classification:

H03F 345

US Classification:

330261

Abstract:

Two input stages (10,12) are interconnected so that their input common mode voltage ranges to one side of signal ground are combined to provide a common mode voltage range substantially equal to the supply voltage. One stage has N-channel differential input transistors (N1,N2), while the other stage has P-channel differential input transistors (P3,P4). The input current branches of the stages are interconnected by current mirror transistors (N6,N7) so that signal current is shared. The output (22) is taken from one branch of the N-type stage (10) and coupled to an output stage (24) with frequency compensation (C,R).

US Patent:

46299106, Dec 16, 1986

Filed:

Oct 21, 1985

Appl. No.:

6/788525

Inventors:

Scott H. Early - Indianapolis IN
Roger L. Minear - Wyomissing PA

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H03K 333
H03K 508
H03K 17687

US Classification:

307317R

Abstract:

An integrated circuit amplifier for a high impedance microphone (100) of the capacitance type is disclosed. The subject amplifier circuit permits the further miniaturization of an electret microphone as it is capable of providing an input impedance simulating a resistor value of hundreds of megohms. The circuit particularly comprises duplicate coupling circuits (101a and 101b), a source of reference direct current voltage (103), and a gain providing circuit (102). The coupling circuits (101a and 101b) comprise a first pair of diodes (Q1 and Q2) symmetrically placed about one input terminal (IN1) of the microphone (100). Outputs of the reference voltage source (103) are provided to coupling circuits (101a and 101b) and through the coupling circuits to gain providing circuit 102. Such an arrangement facilitates power supply noise rejection and automatic canceling of direct current voltage drifts.

US Patent:

44737947, Sep 25, 1984

Filed:

Apr 21, 1982

Appl. No.:

6/370498

Inventors:

Scott H. Early - Indianapolis IN
Roger L. Minear - Wyomissing PA

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

G05F 320

US Classification:

323315

Abstract:

An integrated circuit amplifier for a high impedance microphone (100) of the capacitance type is disclosed. The subject amplifier circuit permits the further miniaturization of an electret microphone as it is capable of providing an input impedance simulating a resistor value of hundreds of megohms. The circuit particularly comprises duplicate coupling circuits (101a and 101b), a source of reference direct current voltage (103), and a gain providing circuit (102). The coupling circuits (101a and 101b) comprise a first pair of diodes (Q1 and Q2) symetrically placed about one input terminal (IN1) of the microphone (100). Outputs of the reference voltage source (103) are provided to coupling circuits (101a and 101b) and through the coupling circuits to gain providing circuit 102. Such an arrangement facilitates power supply noise rejection and automatic canceling of direct current voltage drifts. A current repeater circuit (FIG.

Address:

7322 Jessman Rd South Dr, Indianapolis, IN 46256

Phone:

(610)5277268

VIN:

WBAWL73517PX46330

Make:

BMW

Model:

3 SERIES

Year:

2007