Abstract: Disclosed is electromagnetic transducer that does not require complex analog to digital, digital to analog converters, microprocessors or large memory circuitry. The transducer has a helical tablet coil with tap nodes spaced between its end extremities. In one configuration, an oscillator drives the tablet coil for simultaneously producing oppositely directed currents on opposite sides of selected taps, creating a moving fringing field that is compatible with modern graphic display tablet technology. A control circuit of the transducer has a closed-loop integrator for detecting the centroid of a received stylus signal from a stylus coil. Analog and digital versions of the integrator are disclosed. In another configuration, the oscillator drives the stylus coil for variably coupling magnetic flux to the tablet coil, a receiver signal that is coupled from the end extremities being responsive to the position of the stylus coil and the taps selected.

Abstract: Disclosed is electromagnetic transducer that does not require complex analog to digital, digital to analog converters, microprocessors or large memory circuitry. The transducer has a helical transmitter coil with tap nodes spaced between its end extremities. An oscillator drives the coil for simultaneously producing oppositely directed current on opposite sides of selected taps, creating a moving fringing field that is compatible with modern graphic display tablet technology. A control circuit of the transducer has a closed-loop integrator for detecting the centroid of a received stylus signal. Analog and digital versions of the integrator are disclosed.

Abstract: Method and apparatus for detecting and sectionalizing troubles on telephone lines automatically. Specifically, an embodiment for detecting and sectionalizing troubles on a telephone line connecting a switching machine and a subscriber telephone set connected thereto over the telephone line, includes apparatus which: (a) emits a pulse over the telephone line; (b) detects reflections of the pulse; and (c) and determines whether a reflection was received prior to the expiration of a predetermined time period. The predetermined period relates to a distance which is less than the length of the telephone line between the switching machine and the subscriber telephone set.

Abstract: A handwriting capture device which employs a highly sensitive digitizer to accurately capture signature information entered using a writing force greater than or equal to a predetermined writing force. The handwriting capture device includes a housing having a top surface, a resistive membrane digitizer mounted in the top surface and having a low pattern density, a layer of urethane rubber for frictionally holding the receipt in place, circuitry for processing digitizer information, a clamp for retaining a receipt in place over the digitizer during movement of the device, and circuitry for sensing the presence of the receipt and for activating data capture by the digitizer when the receipt is positioned under the clamp. In the preferred embodiment, the clamp also serves to minimize finger contact with the digitizer.

Abstract: In a telephone system 1 connectable to both integrated service digital network (ISDN) lines 3a and 3b and a public subscriber telephone network (PSTN) line 7 and having a plurality of extension telephone sets 11a to 11d, the speech sound volume through the ISDN lines 3a and 3b is so adjusted as to become equal to that through the PSTN line 7, by changing the loss rate (i.e. gain) of digital pads 55 and 47 provided in ISDN interface units 5a and 5b. That is, a level confirmation tone is generated in the system 1; this tone is transmitted to a first extension telephone set 11a via only the ISDN on one hand and to a second extension telephone set 11b via both the ISDN and PSTN in series on the other hand; and the loss rate (i.e. gain) of the digital pads 55 and 47 are changed or adjusted so that the sound of the level confirmation tone can be heard at the same volume level by both the telephone sets 11a and 11b.

Abstract: In a telephone system, several telephone terminals are connected to a single telephone line including several telephone interface circuits (6, 7, 8), each interface circuit being energized by ringing signals appearing on the line and being arranged between the telephone line (3) and one of the telephone terminals (13, 14, 15, 16), the ring of which is disconnected from the line. Each interface circuit comprises a circuit (26) for counting ringing signals and picking up the line, this first circuit receiving at the input the ringing signals appearing on the line (L1-L2) during a telephone call, and counting a predetermined number of these ringing signals, then picking up the line by a relay (27) at the moment the last ringing signal counted stops. The system is powered only by the signals on the telephone line.

Abstract: There is provided a key telephone system which can use data registered in a memory card. The system comprises: a main apparatus which has a memory and operates in accordance with the data stored in the memory; and an extension telephone having a receiving circuit to receive data from a memory card, wherein the main apparatus stores the data which was received by the extension telephone from the memory card into the memory. With this system, data such as names, denominations, telephone numbers, and the like of the partners can be registered into a portable device such as a memory card by the keyboard of the extension telephone or by the keyboard of the portable device at a remote location at an arbitrary time.

Abstract: An exchange having a display apparatus for displaying the states of a plurality of subscriber terminals accommodated therein. The display apparatus includes a display board having n indicator-keys, each for displaying the state of a subscriber terminal and an indication board having m indicator-keys, each for selectively indicating the states of n groups of subscriber terminals so that the states of a total of n.times.m subscriber terminals are displayed. Under control of the exchange, the display apparatus displays an incoming call and a recall terminated at an attendant console by lighting up the indicator-keys and flickering the indicator keys on and off, respectively. When an indicator-key which is displaying an incoming call or a recall is pressed, the subscriber terminal and the station line concerned are connected.

Abstract: A data transmission control processing system comprising the steps of easily realizing the reading, writing of the memories of the other terminals coupled with the above described transmission passages in a system where a plurality of terminals provided with a transmitting, receiving control processing portion for transmitting receiving the control signals are coupled by transmitting passages so as to effect the mutual communication, realizing the writing onto the memories by a system similar to the reading of the memories when the above described system is a system by the D2B, being capable of easily coping with respect to the expansion of the reading.writing control operation of the memories, simplifying the realization of the reading.writing control sequence which is adapted to reduce the amount of the telegraphic messages to be exchanged in the reading.writing operation of the memories on the other terminal.

Abstract: An improved finger touch and stylus detection system for use on the surface of a display device is disclosed. An overlay having horizontal and vertical transparent conductors is coupled to the other elements of the system through a bus having a minimum number of bus wires. A control processor issues command signals which selectively couples the transparent conductors to a capacitive measuring device and a radiative measuring device to determine finger and stylus position respectively. The improvements to the system include a radiative stylus having a spherical antenna which receives the overlay signal independent of the angle at which it is held. Further, a contact detecting mode has been added to eliminate spurious stylus positions measured between strokes, when the stylus is proximate to but not in contact with the overlay.

Abstract: A remotely controlled line conditioning apparatus is installed in the terminal where access to the telephone loop to be tested is readily available. Although a metallic bypass pair from the central office to the (remote) terminal may also be available, its presence and/or condition does not affect the ability of the apparatus to condition the line under test. The line conditioning apparatus includes a telephone line termination unit and an intelligent control unit. The telephone line termination unit has a telephone line access port to which a telephone line pair is selectively coupled, and is operative to controllably impart a selected one of a plurality of electrical signalling conditions to the telephone line pair under test. The control unit has a communication modem through which communication signals containing telephone line conditioning messages are coupled to and from the central office/remote terminal communication link.

Abstract: A method of producing an image drive signal which is free of skew. Disclosure is made of a point of sale merchandising system having a transparent digitizer mounted on an LCD module. A stylus is used to draw a signature on the digitizer, and the signature is displayed on the LCD module in registration with the moving stylus. Skew effects are eliminated by performing a mapping transformation using a set of 6 transformation constants. These constants are derived from data obtained while placing the stylus over three reference spots on the display.

Abstract: In a ground fault detector for long distance subscriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter converts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is recovered by the maintenance person without breaking the resistor.

Abstract: Information processing, for example by means of a computer, is served by a tablet in combination with an inputting implement such as stylus or human finger. Such a tablet-implement combination may serve in lieu of or ancillary to other inputting means such as a keyboard. Implement positional information, e.g., as contacting the tablet, depends upon interpolation as between segmenting lines in the tablet. Cost advantage commensurate with resolution/noise desiderata is ascribable to use of analog information (without digitization) in interpolation.

Abstract: A telephone system and method of operation are disclosed which use a microprocessor control system (10), a speech generator (34) and speech memory (46) to automatically place calls without the need of a live operator. The telephone receives a destination telephone number and billing format information from a user. The microprocessor control system (10) alters the access format of the destination number and places the call as a direct dial telephone call. The billing format information is stored in a call record memory (11). The billing format information may later be retrieved to facilitate the billing of charges for the call to an appropriate party.

Abstract: A digitizer tablet capable of reduced coordinate wobble due to beat interference between an induced display scan rate and the tablet scan rate by introducing a controlled delay to change the time between successive samples to increase the beat frequency to the point where it can be effectively filtered out.

Abstract: A stylus formed of a shaft containing pressure sensors and useful in signature verification and in identification of individuals. The pressure sensors are imbedded in and integral with the shaft of the stylus at a predetermined distance from the tip used for writing. The sensors are preferably disposed in an annulus and located in each of four quadrants surrounding the shaft enabling three-axis pressure detection.

Abstract: A digitizer tablet and puck(cursor) for use therewith, characterized that in one aspect the puck is provided with at least one additional control which will provide the user with the ability to control at least one N-dimensional signal in addition to the normal X-Y coordinate data. In accordance with another aspect, any pointing device for the tablet is provided with the capability to control the manner in which the N-dimensional signal varies in response to user manipulation of the pointing device.

Abstract: A test system directed to apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair. The system converts an analog signal from a local switching station to an 80 ksymbols/sec signal for transmission over a twisted pair by a line card. A remote terminal converts the 80 ksymbols/sec signal back into a conventional analog signal for use in conventional telephone, facsimile or other related equipment. The test equipment separately tests the entire system, the line card portion of the system, the remote terminal portion of the system, and the twisted pair.

Abstract: An electronic blackboard apparatus comprises an electronic blackboard unit, a writing instrument, a position-detecting control unit, and an output section. When video information such as characters and figures is depicted on a writing surface by means of the writing instrument, a magnetic bias with a locus corresponding to the video information is simultaneously applied to a position-detecting tablet of the electronic blackboard unit. Position coordinates thereof are computed by the position-detecting control unit and converted into electric signals. Similarly, when the video information on the writing surface is erased by means of the eraser, a magnetic bias with a locus corresponding to the erased video information is simultaneously applied to the position-detecting tablet. Position coordinates thereof are calculated by the position-detecting control unit and converted into electric signals.