Abstract: The logic signals (S0, S1, S2, HL) which define the pixel are combined together with the synchronization signals (HS, VS) by a composer circuit (19) disposed in the display control, to form a single composite signal. The composer circuit (19) is connected by way of a single conductor (21) to a separator circuit (29) for separating the synchronizing signal, disposed in the VDU control circuit (20). The VDU control circuit comprises horizontal and vertical deflection circuits (27, 43 and 28, 44) for a CRT (24) and further comprises a format selector circuit (30) which is capable of sensing the duration of the vertical synchronizing pulse to control the frequency of the video signal vertical deflection circuit (28, 44).

Abstract: A terminal device sends/receivers data and voice signals through a low speed circuit to/from another device, while switching automatically data and voice signals. The terminal device comprises a data sender/receiver, a voice sender/receiver, a modulator/demodulator, and an automatic mode switch. The automatic mode switch includes a circuit disposed beteen the data sender/receiver and the modulator/demodulator for detecting special data such as flags from received data coming from the modulator/demodulator, a circuit for making a logical product of the output of this detecting circuit and a detection signal of the received carrier and means for separating the voice sender/receiver from the circuit and transmitting a sending request for data sending/receiving use. Further switching over from the voice sending/receiving mode to the data sending/receiving mode is effected by key operations, etc.

Abstract: A coordinate input apparatus which comprises a display unit having a display layer, and a protecting layer disposed on said display layer and having two-dimensionally arranged light guides for transmitting light from the display layer in the direction substantially perpendicular to the display layer, wherein a user designates a coordinate position on the display layer through the protecting layer.

Abstract: A line sychronizing circuit in a picture display device, has a phase control loop including an oscillator and a phase comparison stage. In order to enlarge the capture range of the control loop, the phase comparison stage is in the form of a phase-frequency detector having a trigger action on edges of pulses applied, the circuit being provided with means for inhibiting the supply of the control signal form the phase-frequency detector during a predetermined period after establishing that the phase difference measured by the phase-frequency detector between the local line-frequency signal and the incoming line synchronizing signal is larger than a predetermined value. In the perdetermined period, the oscillator signal has substantially the same frequency as before establishing that the phase difference measured by the phase frequency detector is larger than the predetermined value.

Abstract: Video display apparatus is described in which video data is held in a dynamic random-access memory (DRAM). In each cycle, one processor access and four video accesses are made to be DRAM. The video data is de-skewed, by feeding it through two registers in series, so as to ensure that the four video data words can be sampled at equally spaced intervals, equal to one-fourth of the cycle.

Abstract: This invention is for encoding a language according to the pattern of the language's characters. The invention includes an accompanying keyboard which can be used to encode the language. In particular, the invention is directed toward encoding a language into a six-digit code. The invention is particularly useful with Chinese and Japanese characters. The characters are divided into two parts and given a code according to their respective patterns. The code is then combined into the six-digit code. In addition, a portable multi-language computer and mini-keyboard is provided for encoding the characters.

Abstract: A cathode ray tube controller holds a write-in address and displaying image data or a read-out address from a central processing unit. The cathode ray tube controller makes access to a memory by a write-in or read-out address from the central processing unit during a period in which the displaying image data in a horizontal scanning period are not read out from the memory, so that the read or write operation with respect to the memory can be carried out during the horizontal scanning period.

Abstract: A telecommunication system has the ability to identify words typed out on a DTMF multi-button pad, convert the words into digital format at a telephone access node and transmit that information on a packet transport network to a remote access node where the words are converted into speech and forwarded to the receiver. The sender begins by typing out the letters of the word on the DTMF buttons. As the word is typed out it is compared at an entrance telephone access node to words stored in a word data bank referred to as a word guessing dictionary. The words in the data bank are stored according to length, numeric equivalent and relative frequency. A prompter asks the sender if the identified word is correct. If it is correct, it is converted into ASCII digital format and transmitted by packet transport network to an egress telephone access node near the receiver.

Abstract: In an auto dialling facsimile apparatus, data representive of telephone numbers of specified destinations are stored in a first memory and data representative of access time intervals are stored in a second memory corresponding respectively to the specified destinations. The stored data are retrieved from the first and second memory in response to the entry of a called station unique code supplied from a keyboard. Telephone switching signal is transmitted to a switched telecommunication network in accordance with data retrieved from the first memory to establish a connection through the network. The length of time elapsed from the time said dialling signal is transmitted is measured, the measured time length being reset when an answer signal is returned from the desired destination. The switched connection is released when the measured time length exceeds the access time interval represented by the data retrieved from the second memory.

Abstract: Method and apparatus for indicating the position of a core member of a linear variable differential transformer having a primary coil and a secondary coil. A square pulse is applied to the primary coil. The secondary coil is sampled a predetermined time after applying the square pulse. In one embodiment a periodic square wave signal is applied to the primary and the secondary is periodically sampled.

Abstract: An apparatus and method for controlling a bit-mapped CRT raster display where a processor stores a bit-map of a CRT display frame in a buffer memory as strings of data words representative of bit-maps for single scan lines of the display. Associated with each string is a pointer which contains the starting address of the string which maps the next scan line. A controller accesses the buffer memory to output the data words of each string to a serializer in synchronism with the raster to generate a CRT video signal. After each string the controller accesses the buffer memory to get the pointer to the next string. In response to a initialization signal from the processor the controller obtains the pointer to the string associated with the first scan line from predetermined locations in memory. Alternatively the processor may directly load the controller with the initial pointer prior to each raster frame.

Abstract: An image display apparatus which synthesizes one color picture by placing a plurality of pictures with one on top of another. Only one shape generator and one character generator are provided for common use in synthesizing one color picture by placing the plurality of pictures with one on top of another. Each of the plurality of pictures is stored in a dedicated V-ram and is fed to the common shape generator and character generator via a priority decision circuit.

Abstract: In construction of a keyboard for word processors and computer machines, character patterns of different key arrangement modes are stored in different memories for selective read-out so that any key arrangement mode chosen by an operator should be visually indicated on keys, thereby enabling use of a keyboard in various modes.

Abstract: A circuit arrangement for subscriber stations which are supplied by way of subscriber lines and which have dial devices and voice circuits employ, in order to minimize the insertion lost during the voice mode, current feed to the dial device by way of a double Graetz bridge in which two bridge arms are provided in common for both bridges. An additional resistor is connected in the feed line of one of the two bridges os that, in a voice mode, the bridge with the additional resistor is actively switched by means of a dial off-normal contact, whereas, in the dialing mode, the bridge without the additional resistor is actively switched.

Abstract: A control apparatus for providing added service telephone features for stations of a multiple party line. Features provided are automatic number identification, party line privacy, fully selective ringing, remote station verification and disconnect and revertive calling. Apparatus to provide these features includes as the control logic, a conventional microprocessor acting on external logic and buffer memory interfacing with the line conductors. The external logic and buffer memory sense the input condition changes and provide signals indicative of these changes to the processor. The external logic and memory maintain a condition and monitor the line for condition change.

Abstract: A telephone signaling interface (I1) enables compatible communications between a modified telephone station set (S1) and a key telephone system (KTS1). Separate alternating voltage control signals from the key telephone system (KTS1) are amplitude and polarity modulated and combined by the interface (I1) to provide ringing, switchhook supervision and visual signaling to station set (S1) over a single signaling wire pair (C1). Current flow on the signaling pair (C1) in one direction provides visual signaling while distinguishable amounts of current flow in the opposite direction provide the supervision and ringing signals. Interruption of the supervision current is converted by interface (I1) into an A lead supervision signal for the key telephone system (KTS1). Voice communication between the modified station set (S1) and the key telephone system (KTS1) occurs over a separate voice communication pair (V1).

Abstract: The exclusion circuit disclosed herein provides for line privacy in a key telephone system of the type in which a control unit provided at each of a plurality of stations can be operated to selectively connect one or more telephone lines to the phone set at the corresponding station. Within each control unit, an exclusion circuit is provided for each telephone line that extends to the control unit, and is connected so as to cooperate with a line condition sensing circuit, a line switching relay, a relay latching circuit and a manually operated line selector switch, all of which are associated with the same line as the exclusion circuit.

Abstract: A multi-link intercom with a sequencing logic circuit for controlling a solid state switching matrix to connect station through an available link. Control information from the stations is decoded and stored in a register under sequence control for completion of a connection from a calling station to a called available station over an idle link.

Abstract: A driver circuit for an electrical load device such as an indicator lamp includes the capability to both drive the lamp and to respond to a fault condition in the lamp to disable its energization. The circuit is adapted for control by a single I/O terminal of a programmable logic device. The I/O terminal being of the type having an internal architecture that causes the terminal to be pulled up to a logic high state when unloaded, and pulled down to a logic low state by either external loading or the closure of an internal; program-controlled switch forming part of a low-impedence path to ground. A processor-implemented test routine can be used to monitor the I/O terminal voltage and close the internal switch when the driver circuit responds to a shorted condition.

Abstract: A portable telephone assembly has a portable assembly and a base assembly each provided with a radio transmitter and receiver. The portable unit is operative to generate first and second frequency signals one of which is interruptable upon dialing. The base unit includes frequency responsive means operable to connect the base unit to a telephone line when both signals have been received and for interrupting and reestablishing the connection during dialing.