41
Martin Sessler, James E West: Unidirectional second order gradient microphone. American Telephone and Telegraph Company, Bell Telephone Laboratories Incorporated, Patrick E Roberts, David R Padnes, May 3, 1988: US04742548 (31 worldwide citation)

A second order gradient microphone with unidirectional sensitivity pattern is obtained by housing each of two commerically available first order gradient microphones centrally within a baffle. The baffles have flat surfaces, are preferably square or circular and have parallel surfaces the two baffle ...


42
Gerald L Frazer: Adaptive threshold circuit. Bell Telephone Laboratories Incorporated, David R Padnes, May 15, 1984: US04449102 (31 worldwide citation)

The adaptive threshold circuit (FIG. 1) senses the amplitude of a digital signal relative to a threshold and generates a corresponding output signal therefrom. Feedback circuitry generates a correction signal which drives the threshold toward a predetermined level in the signal-eye pattern. This pre ...


43
Qi Bi: Data recovery technique for asynchronous CDMA systems. AT&T Bell Laboratories, David R Padnes, August 23, 1994: US05341395 (30 worldwide citation)

To recover the bits from various users in an asynchronous CDMA communications system, samples of the received signal are processed using blocks of code coefficients. Each code coefficient block includes the sequence of code coefficients for each user which formed the received signal samples. Each se ...


44
Velraj Ramaswamy, Michael David Rauchwerk: Technique for time-sharing a microprocessor between a computer and a modem. Lucent Technologies, David R Padnes, October 14, 1997: US05678059 (29 worldwide citation)

A personal computer's microprocessor is time-shared to provide the functions formerly provided by a microprocessor dedicated to a modem. This technique is transparent to software applications programs which interact with a modem. The personal computer utilizes an operating system, such as the Micros ...


45
Stewart E Miller: Optical communication system. AT&T Bell Laboratories, Sylvan Sherman, David R Padnes, August 21, 1984: US04467468 (29 worldwide citation)

A new transmission system configuration is disclosed which takes advantage of the special properties of lightwave devices and the extensive availability of frequency space on optical fibers. The system employs a combination of time and frequency multiplexing at the transmitter, and frequency demulti ...


46
William C Young: Optical fiber switch. Bell Telephone Laboratories Incorporated, David R Padnes, October 4, 1983: US04407562 (29 worldwide citation)

Switching between optical fibers is achieved through the use of a fixed (101) and a moveable (102) housing disposed within a slotted support member (103, 205). The fixed and moveable housings respectively contain first (104, 105) and second (108) sets of optical fibers. Each housing has two grooved ...


47
Eran Cohen, Andrew T Weitzner, Jean Jacques Werner: Distortion compensation technique. AT&T, Thomas Stafford, David R Padnes, July 30, 1996: US05541964 (27 worldwide citation)

Symbols which are representative of customer data are transmitted in bursts. In the idle mode, i.e., the time intervals between bursts, symbol sequences which are a priori known to the receiver are transmitted. Such idle mode symbols maintain adaptive apparatus, such as NEXT cancellers and equalizer ...


48
Jalil Fadavi Ardekani, Jin Der Wang: Technique for adjusting signal dispersion cancellation apparatus in communications systems. AT&T Bell Laboratories, David R Padnes, May 26, 1992: US05117291 (26 worldwide citation)

A technique for generating the tap-weight coefficients for a signal dispersion cancelling filter utilizes circuitry which is responsive to received signal samples and generates a time-ordered sequence of derived signal samples. The tap-weight coefficient circuitry includes filters which operate in r ...


49
Richard E Wagner: Optical switch with rotating, reflective, concave surface. Bell Laboratories, David R Padnes, April 14, 1981: US04261638 (26 worldwide citation)

An optical switch is disclosed which relies only on a rotatable, reflective concave surface (3) to couple light between an optical source (1) and a preselected one of a plurality of optical receptors (6). The switch is bidirectional, i.e., the position of the source(s) and receptor(s) can be interch ...


50
David A Fishman: Automatic power supply load shedding techniques. AT&T Bell Laboratories, David R Padnes, May 21, 1991: US05017799 (26 worldwide citation)

Reducing the power consumption of loads fed by one or more power supplies is achieved by the use of apparatus which determines the power supply output and, upon the occurrence of a predetermined condition, generates a signal to the power-consuming loads. In response to this signal, the loads alter t ...