Abstract: A relay station is interposed between the end systems and is equipped with a large capacity memory in which a PDU is stored for a given time period in the event that the PDU includes an indication for retaining the same in the memory. Subsequently, when it is noted that the destination of the PDU is erroneously attached, a destination correction PDU is dispatched to the relay station within the given time period. Thus, the PDU is given a correct destination and is redirected to the intended end system.

Abstract: A transmitter includes an attenuator for adjusting the level of an output signal as a function of the pulse width and frequency of the output signal. The transmitter also includes receiver components which are disabled when the transmitter is transmitting.

Abstract: An interlacing television camera apparatus includes a solid-state imaging device, drive unit, delay unit, and vertical-edge correcting unit. The drive unit drives the imaging unit to simultaneously output, in a first field, a main video signal and a sub-video signal i.e., even and odd numbered lines, respectively, in a first field from the device, which represent a charge accumulated in a pixel located on a scanning line of the first field and a charge accumulated in a pixel located on a scanning line of a second field next to the first field, respectively. Next, the drive unit drives the imaging device to simultaneously output, in the second field, a main video signal and a sub-video signal in a second field from the device, which represent the charge accumulated in the pixel located on the scanning line of the second field and a charge accumulated in a pixel located on a scanning line of a first field next to the second field, respectively.

Abstract: A remote control transmitting device for a robot includes a secret number switching unit for inputting user's secret numbers; a function selecting switch for allowing the user to select a robotic function; a high level & open signal transmitting circuit for outputting voltage signals representing various robotic functions, respectively; an operation command switching unit for receiving operation commands from the user such as release, warning sound, scouting, left, forward and right; a low and enable signal transmitting circuit for outputting a low signal and an enable signal after receipt of the user's operation command signal outputted from the operation command switching unit; and an encoder for outputting encoded signals in accordance with the low & enable signal transmitting circuit, the secret number switching unit and the high level & open signal transmitting circuit.

Abstract: A distributed authentication system that prevents unauthorized access to any computer system in a distributed environment. Authentication using the present invention involves three distinct phases. In the first phase, user passwords are generated by the computer system and encrypted on a coded card together with a message authentication code to prevent alterations prior to any access attempts. These are complex and impersonal enough not to be easily guessed. This coded card must be used whenever requesting access to the system. Second, in addition to supplying a password, the user is required to correctly respond to a set of randomly selected authentication challenges when requesting access. The correct responses may vary between the right response, a wrong response or no response depending on some predetermined variable, e.g., the day of the week or hour of the day. The dual randomness thus introduced significantly reduces the usefulness of observed logon information.

Abstract: Picture display device having a vacuum envelope for displaying pictures composed of pixels on a luminescent screen, comprising a plurality of juxtaposed sources for producing electrons, local electron ducts cooperating with the sources and having walls of electrically insulating material with a secondary emission coefficient suitable for electron transport for transporting, through vacuum, produced electrons in the form of electron currents through juxtaposed trajectories at a short distance from the luminescent screen, and means for withdrawing each electron current at predetermined locations from its duct and directing it towards a desired location on the luminescent screen for producing a picture composed of pixels.

Abstract: An apparatus and method for ultrasonically communicating information from a source to a destination and for acknowledging receipt of that information by the destination. The apparatus includes at least one processor, at least one transceiver, and at least one display device, each display device having a unique identifier. The processor communicates information for broadcast to the transceiver. The processor also performs digital signal processing for detecting an acknowledgement signal within a narrow bandwidth. The transceiver ultrasonically broadcasts an identifier and associated data to display devices within the broadcast area, and also receives ultrasonic signals. A display device includes a transducer, a comparator, a memory, a display panel, and logic. In the communication method, a processor, a transceivers, and a display device communicate by initially associating data with a unique display device identifier.

Abstract: In an address receiving mode of a paging receiver, an address codeword contained in each successive batch of a paging signal is compared with the address of the receiver to detect a match. The bit rate of data pulses generated by the receiving section are checked to see if it is in a prescribed range of bit rates. If the receiver fails to detect an address match in one of the batches due to fading, it continuously receives the address codewords in successive batches, rather than returning to standby mode, if the bit rate of the data pulse is determined to be in the prescribed range.

Abstract: A toroidal cavity-type electron accelerator is provided with a pair of electron beam sources. The beams from the two sources are respectively injected into the accelerating cavity at the mid-plane thereof and at a point displaced from the mid-plane whereby the electrons comprising the beam injected on the mid-plane will be accelerated while the electrons comprising the beam injected at the off mid-plane location will be decelerated and contribute their energy to producing a field for accelerating the electrons of the other beam.

Abstract: A method and apparatus update page transmission verification statistics maintained by a network management center (140) in a radio paging system (100) in which encoding of a page is performed by a paging base station lo (132) remote from a central paging controller (101). Verification information is selectively stored (510, 514) in the paging base station (132) when a page is transmitted (512) in response to paging data sent from the central paging controller (101). The verification information includes an identifier (408) associated with the page and a time report (409) for reporting time of transmission of the page. The stored verification information is transmitted (608) periodically from the paging base station (132) to the network management center (140), and then combined (818) in the network management center (140) with current page transmission verification statistics (212) maintained by the network management center (140), thereby updating the page transmission verification statistics (212).

Abstract: Upon receipt of address data which matches one of a given plurality of capcodes, this pager executes a paging service corresponding to the matching capcode; this pager is characterized in that any capcode or capcodes specified as being invalid are replaced with a capcode or capcodes specified as being valid based on valid/invalid flags each corresponding to respective one of the capcodes.

Abstract: In a paging receiver having a processing unit (15) which produces an incoming message in response to reception of a radio signal specifically directed to the receiver, the processing unit compares the incoming message with each of selected messages selected from particular messages which are memorized in a message memory (18). Only when the incoming message is not coincident with at least one of the selected messages, the processing unit produces an activating signal. In accordance with the activating signal, the processing unit stores the incoming messages as one of the particular messages in the message memory. When the incoming message is coincident with at least one of the selected messages, the incoming message is not stored in the message memory.

Abstract: A portable vibratory alerting device (20) is part of a resonant system (20, 30) and has a resonant vibrator (60) for both generating a vibrational alert and sensing the resonant frequency of the resonant system. The vibrator (60) is driven by a variable frequency driver (76, 78), and thereafter the resonant frequency is measured by a sensor (82). A vibration controller (72) causes the frequency of the vibrator to be substantially equal to the resonant frequency of the system.Alternately, a portable alerting device (520) has both a vibrator (160) and a sensor (166) for sensing the amplitude of a vibratory alert at various frequencies. A vibration controller (72) generates a vibratory alert at an optimum frequency in response to the sensed amplitudes.

Abstract: A messaging peripheral (100) includes a processor (106) for executing a microcode program that controls operation of the messaging peripheral (100), and a PCMCIA memory only interface (119) that allows communication of communication of at least one message and a user selectable password between an electronic information processing device (200) and the messaging peripheral (100). The PCMCIA memory only interface couples to a secure memory access interface that is controlled by the processor (106). The secure memory access interface (703) allows the electronic information processing device (200) to access the at least one message when a memory protection mode is selected and the processor (106) receives a user entered password and performs a correlation between the user entered password and the user selectable password.

Abstract: A multiport repeater for a data network operating on a CSMA or CSMA/CD protocol, for example an Ethernet local area network, has signals transmitted from port to port via a crosspoint switch or other appropriate switching means. The destination address of each incoming data frame is read and compared with a stored table to determine which port or ports the frame needs to be transmitted to, and the switching means is then operated to cease transmitting the frame unnecessarily to other ports. The remaining ports are thus returned to an idle state, and a second frame overlapping with the first can be received and retransmitted provided it does not require any of the ports that are in use in transmitting the first frame.

Abstract: A communication system comprises a signal carrying medium (8) coupled to a series of end station ports (2-5). The end station ports (2-5) enable respective end stations (21) to transmit signals onto and receive signals from the medium (8). A controller (7) is provided to control the connection of the end stations (21) to the medium (8) via the ports (2-5). Monitors (9-12) are connected to the controller (7) to monitor characteristics of signals generated by the end stations (21) coupled to the ports. The monitors (9-12) are connected in parallel to the medium (8) and supply information relating to the monitored signals to the controller (7) in use. This system allows faulty end stations to be identified and removed from the system.

Abstract: A control apparatus for controlling a paging receiver capable of displaying a corresponding message and a state information includes an antenna 1 for receiving an RF signal; an RF receiver 2 for demodulating received RF modulation signal from the antenna 1; a waveform shaper 3 for shaping waveforms into a secondary signal after filtering the demodulated signal; a micom 4 for controlling the paging receiver; an EEPROM 5 for discriminating data of the paging receiver; an alert driver 6 for generating an alert signal under the control of the micom 4; a speaker 7 for generating an alert tone by the alert driver 6; an LCD device 8 for displaying the data under the control of the micom 4; a key input 9 for generating a first key data signal and a second key data signal; and a state driver 10 for displaying the state of the paging receiver.

Abstract: Multi-apparatus consumer electronics system provided with multiple channel for control and data signalization including qualifier bus control channel, and initiator apparatus and follower apparatus for use in such system. A consumer electronics system has plural apparatuses interconnected by a multiple channel for control and data signalization including a control channel. The control channel is a qualifier bus that in each apparatus is interfaced to a control element that in an initiator apparatus transmits a message selectively specifying a proprietary signalization interface. A follower apparatus acknowledges the message if the user signalization interfaces match. Thereupon, the system coactivates the matched interfaces in initiator and follower apparatuses. In an extended form, the apparatuses as a prerequisite try to consent about a standard protocol on a further control channel external to said multiple channel.

Abstract: In a device for ion generation, the ionization chamber is characterized by walls coated with a material with a high coefficient of secondary emission, such as a suitable glass; this enables the energy yield and mass yield of the device to be improved with respect to known techniques. (FIG.

Abstract: An electron gun for a color picture tube having heaters, cathodes, a control electrode, a screen electrode, a focusing electrode and a anode, the focusing electrode for forming a main lens and said anode further having elongated octagonally shaped apertures. The electron gun thus configured enables the convergence and resolution of the color picture tube to be improved.