Abstract: Digital communication system of the type having a commutating N:1 multiplexer and a commutating 1:N demultiplexer. One of the N sources is inverted prior to being applied to the multiplexer. Automatic frame synchronization and detection circuitry is provided which repeatedly monitors the output of the demultiplexer at which the inverted signal is to appear when frame synchronization is present. Such output is monitored for signals of one logic during each monitoring time period to determine whether frame synchronization is present. A signal is obtained by such circuitry when frame synchronization is not present and is used to commutate the demultiplexer a predetermined number of steps whereby frame synchronization is attained.

Abstract: A thermal print head with a plurality of spaced-apart electrical conductors carried by a support with a surface area provided at an end portion of each conductor. A common electrical conductor is provided having a thin portion for each surface area which is spaced from and essentially parallel to the surface area with resistive material disposed between the common electrical conductor and each of the surface areas. The print head provides a path for current flow and thermal flow through the resistive material in a direction essentially perpendicular to the surface areas.

Abstract: A multiple priority remote control system for the remote control of a traffic signal control system for a traffic intersection responsive to optical signals transmitted by optical energy transmitters carried on designated vehicles operating along the roadways of the intersection. The remote control system includes signal discriminator circuitry for producing high or low control signals dependent upon the particular optical signal that is detected and in accordance with the roadway of the intersection from which the detected optical signal is received. A control circuit connected to the controller for the traffic signal control system and to the discriminator circuitry responds to the control signals to provide a green light to the vehicle transmitting the first of two detected low priority signals or the first of two detected high priority signals or the high priority signal of detected high and low priority signals.

Abstract: A leaded mounting and connector unit for an electronic device wherein the unit includes a structure having two parallel sides and a plurality of metallized areas which connect with spaced metallized areas provided at the parallel sides to which terminal leads are bonded. Grooves provided in the two sides receive the terminal leads which, in some cases, can extend beyond the sides serving to locate a cover or locate and connect with a leadless structure positioned above the leaded unit. The terminal leads are provided with tab members for locating the leads relative to the structure and to locate a leadless structure at a position above the leaded unit.

Abstract: A liquid level sensing electrode structure provided by flat cable which has a plurality of insulated conductors cut to various lengths with end portions exposed to provide sensing electrodes is used in a liquid level sensing system. A common electrode is provided for the system. A separate voltage inverter is provided for each sensing electrode and connects with a voltage source to provide a microprocessor compatible signal when liquid is presented to the common electrode and the sensor for the inverter. A liquid utilization apparatus having a liquid sensing system provides a flow of liquid along the electrode structure to prevent sediment buildup.

Abstract: Apparatus and control circuitry used in a copy machine for providing copy paper cut to length in accordance with an original sheet sensed by two switches in the path of travel of the original. A first feed roller is rotated via a clutch upon energization of a solenoid for the cluch when the leading edge of the original is sensed by the first switch with the clutch disengaged upon deenergization of the solenoid when the leading edge of the original reaches the second switch to provide limited movement of the leading edge of the copy paper from a solenoid operated cutter to a second feed roller. The second feed roller continues to pull copy paper from the roll until the cutter is operated by energization of its solenoid upon passage of the trailing edge of the original past the first switch. The cutter solenoid is deenergized when the trailing edge passes the second switch.

Abstract: Apparatus and method for a drum-type facsimile machine having a clamping mechanism for clamping an edge portion of sheet material to the drum and gripping arms operated for removal of the sheet material for gripping the paper to inhibit its movement with the drum. The gripping action is timed to be present during the unclamping of the sheet material. The clamping mechanism, when moved to its unclamped position, causes a limited rotation to be imparted to the drum to free the clamped edge portion of the sheet material from the drum for withdrawal from the apparatus by the operator.

Abstract: An imaging system and method in which a multi-layered device having a photoconductive insulative layer is utilized to provide an electrostatic charge image at a layer of the device in response to imaging radiation directed to the device. A scanner for scanning the device with readout radiation is used with readout electronics for converting the electrostatic charge image to electrical signals. A D.C. voltage source is used during the imaging step to impress an electric field across the device and is also used to provide an electric field across the device and support charge flow initiated by the readout radiation during the readout step. Devices using a fluid layer that absorbs x-rays to produce electrons and ions are used in the system with x-ray imaging radiation with a conductive layer that is associated with the fluid layer re-positioned closer to the photoconductive insulative layer after the electrostatic charge image has been formed.

Abstract: A multiple priority remote control system for the remote control of a traffic signal control system for a traffic intersection responsive to optical signals transmitted by optical energy transmitters carried on designated vehicles operating along the roadways of the intersection. The remote control system includes signal discriminator circuitry for producing high or low control signals dependent upon the particular optical signal that is detected and in accordance with the roadway of the intersection from which the detected optical signal is received. A control circuit connected to the controller for the traffic signal control system and to the discriminator circuitry responses to the control signals to provide a green light to the vehicle transmitting the first of two detected low priority signals or the first of two detected high priority signals or the high priority signal of detected high and low priority signals.

Abstract: A urinary incontinence stimulator system using an intra-anal electrode which provides a recurring series of pulses of varying duration and frequency to the electrode with each of such series of pulses spaced from the succeeding series by a rest period when no pulses are provided to the electrode.

Abstract: A solid-state programmable control circuit provides multiple time selected application of A.C. power to one or more utilization circuits or devices. The control circuit uses a crystal controlled time base generator which is synchronized to commercial A.C. power. Stand-by battery power is provided to maintain timing when A.C. power is lost. A time display plug-in module is used with the circuit for setting the time for the control circuit. Programming can be done at a point remote from the control circuit.

Abstract: Circuitry for a facsimile receiver for regenerating a carrier signal from the full-wave rectified signal obtained from a received signal which includes an amplitude modulated suppressed carrier signal and periodic short intervals of unmodulated carrier, each interval being synchronous with a position signal produced at the facsimile receiver each time the phase position of the receiver is reached. The circuitry includes a phase lock loop (PLL) which functions as a sample data PLL. A switching means limits closed loop operation of the circuitry to those times when the short interval unmodulated carrier is received during a time slot provided by the switching means each time the facsimile receiver reaches its phase position. In a preferred embodiment, the loop is also closed (sampled) when other periods of unmodulated carrier is present in the received signal to which the switching means responds.

Abstract: An electrosurgical unit having a feedback control circuit for providing control of the power amplifier of the unit so power delivered to tissue presented between the active and return electrodes of the unit will be substantially constant over the range of impedance presented by various tissues that are encountered. The feedback signal to the power amplifier is determined from a comparison of a power level reference signal and the mathematical product of two signals which are derived from a sensed current in the unit that is directly related to current delivered to tissue and a sensed voltage that is directly related to voltage delivered to tissue. A non-linear compensation circuit is also disclosed for use in the feedback circuit.

Abstract: A method using a one-component developer of magnetically attractable, electrically insulating toner particles for developing an electrical potential pattern at a surface. Electrical means and an electrode-developer transport means are provided with the electrode-developer transport means positioned relative to the electrical potential pattern for establishing a unidirectional electrical difference between the potential pattern and an electrically conductive portion provided by the electrode-developer transport means. Rapid turbulent physical mixing action of the toner is provided for producing sufficient repetitive electrical contact of the toner with the electrically conductive portion to cause electrical charge of a predetermined polarity to be injected onto the toner particles. A charge level is so produced, which is sufficient to cause such charged toner particles to be deposited on the potential pattern bearing surface in accordance with the potential pattern.

Abstract: An improvement to the method and apparatus of producing multiple copies of a document using a copy machine having an arsenic selenide photoconductive layer and wherein a development technique is used that is capable of providing uniformly-filled solid areas. The improvement includes the step of exposing the photoconductive layer to light energy prior to uniformly charging the photoconductor for each copy to be produced with such light energy and the light energy used for exposing the charged photoconductor to the light image of the document selected in terms of light energy and spectral distribution to establish a stablized fatigue level for the photoconductive layer thereby eliminating objectionable image density variations between successive copies made of the original.

Abstract: A detector for scanning the surface of a record on a phonograph turntable to distinguish between recorded and unrecorded bands by detecting physical differences on the record surface. The detector illuminates a portion of the record surface and senses light reflected from such portion with a photoelectric cell. The portion of the record surface from which reflected light is detected is accurately controlled for reliable operation by a lens that focuses such reflected light at and through an aperture. The lens is fixedly mounted a first predetermined distance from the aperture and maintained a second predetermined distance from such portion of the record surface by a wheel that rides on the record surface.

Abstract: A method and system for altering the phase difference between a local motor and a remote motor wherein the phase difference is determined in terms of a count made of reference pulses at a first frequency when both motors are operating at a predetermined speed that is directly related to the first frequency. A phase altering count is determined from the phase difference count indicative of the degree to which the phase difference is to be altered and the reference pulses are produced at the local motor at a second frequency to alter the speed of the local motor. The phase altering count and the reference pulses at the second frequency are used to establish a time interval for operation of the stepping motor sufficient to make the desired change in the phase difference.

Abstract: An audio-visual presentation device including a magnetic cassette tape drive and circuitry adapted in a normal automatic forward mode for reproducing audio signals from one track of the cassette tape and for controlling a remotely controllable slide projector in response to signals from a second track of the cassette tape such that the audio signals and slide projector visual presentation remain in synchronization. The device includes a manual reverse switch to permit the device operator to repeat portions of the audio-visual presentation, the switch when in a first position providing normal automatic forward operation in a first tape drive mode and when in a second position providing in a second tape drive mode reverse operation at a higher speed with the audio output muted and the signals from the second track of the tape controlling the projector to cycle in a reverse direction.

Abstract: An X-ray film holder wherein a number of capacitive sensors are positioned and connect with circuitry for determining the presence of film in the holder and, when film is present, determining which one of several predetermined sizes have been placed in the film holder, plus whether the film is properly centered with such information used to provide control signals including a signal with a characteristic dependent on the width dimension of the film and a signal with a characteristic dependent on the length dimension. In addition, the circuitry provides a visible indication of the length dimension of the film placed in the holder for use in positioning the holder with respect to the X-ray source.

Abstract: An interfacing circuit for use in industrial control systems which provide one or more control signals of low power level from integrated semiconductor circuits. The low power level control signals initiate operation of the interfacing circuit to complete a current path from a power source to an electrical load in the control system. Buffer circuits are provided as a part of the interfacing circuit for receiving the lower power level control signals. A reed relay is operated initially by the low power level signals. The relay has a normally open set of contacts which when operated completes the current path from a power source to the electrical load. The interfacing circuit includes a holding current path for the relay. A number of diodes are provided in the interfacing circuit for preventing unwanted current flow in various areas of the circuit under certain circumstances.