Abstract: An image is processed by using an error diffusion method of propagating density distribution errors in pixels around a pixel to be noted. A method includes the steps of calculating thresholds (Th.sub.1, Th.sub.2) of densities corresponding to the area ratio between the pixels; selecting a pixel to be noted (f) which are different in the area ratio from each other; calculating errors (E) produced in the peripheral pixels according to the distances from the peripheral pixels to the noted pixel and areas of the individual peripheral pixels; adding the propagated errors to a density of the noted pixel so as to make a rearrangement (f') on the density of the noted pixel; comparing the rearranged density of the noted pixel with the thresholds to obtain a corresponding level (G) represented in a binary form, and obtaining density distribution errors (e).

Abstract: A number of detection circuits, one for each source of control signal set inputs, and a high speed resolution circuit, are provided for resolving multiple control signal inputs into a single stable, predictable, and useful output signal. The detection circuits detect active control signals in the various control signal set inputs, and generate detected signals. The high speed state resolution circuit generates an output signal, conditionally changing the output state based on the detected signals and the current state being output. When deciding whether to change the output state, the high speed resolution circuit considers only the detected signals applicable to the current output state and responds accordingly, ignoring all other detected signals that are not applicable. The detection circuits and the resolution circuit are coordinated in timings, ensuring proper resolution.

Abstract: A digital phase-locked loop (DPLL) circuit, which achieves a high-precise phase matching between input and output clocks at high speed, irrespective of phase difference between both, is disclosed.

Abstract: A data acquisition and transceiver module is used to acquire data from diagnostic equipment, such as a portable sampling spectrum analyzer. This data is then transmitted to a slave transceiver and storage module where it is stored in memory. The slave transceiver and storage module is typically housed remotely from the diagnostic equipment in the telecommunications electronic equipment and serves as an archival resource for set-up and maintenance parameters.

Abstract: Demodulation of a CDMA downlink signal is performed by filtering correlations of the received signal with a known signature sequence. Unlike the conventional RAKE receiver, the filtering is not necessarily a FIR filter with coefficients equal to the conjugates of channel tap estimates. Instead, the present invention filters in such a way as to maximize the output signal-to-noise ratio, accounting for the fact that part of the noise comes from the same base station as the signal, so that it is colored by the same channel as the signal.

Abstract: An improved phase locked indication circuit for a Costas QPSK carrier recovery loop comprises an inphase channel, a quadrature channel and phase error channel each connected to an input of a three input summing circuit through a diode square law multiplier and wherein the error channel signal is filtered by a low pass filter to smooth the signal before being applied to the negative input of the summing circuit to diminish false lock and not locked signals. The locked and not lock conditions are separated one from the other by a large signal to noise ratio.

Abstract: A process is provided for creating an inktable from a superset of n inks by subdividing the n inks into k subsets of ink groupings, where any given subset contains m.sub.j number of inks selected from the superset of n inks; where the subscript j denotes a particular subset (the j-th subset) in the overall set of k subsets and whose range is 1.ltoreq.j.ltoreq.k.

Abstract: A method, system and process for improving image enhancement tools through the application of expert systems. The improvements are accomplished by the operation of a process in the memory of a processor that enhances an image based on a set of criteria entered by a user. The image is enhanced in at least two ways and the two enhanced images are presented to the user. The user selects the image that appears best and the selected image is thereafter used for subsequent image enhancements according to the user criteria until a final image is created.

Abstract: A selective call receiver (5) has a programmable baud detector (12, 14) which is programmed (30) to test (33) for an absence of a paging signal having a predetermined baud rate at a first falsing rate and the programmed (36) to test (38) for either the presence or absence of the signal at a second baud rate lower than the first falsing rate, wherein samples from the first test (33) are also used in the determination made by the second test (38).

Abstract: An improved method for providing a more faithful and pleasing rendition of a pixel pattern is described herein. This method first places the original pixel pattern in a bit mapped memory. A small portion of this bit mapped pattern, called an input tile, acts as an address for a look-up table containing a corrected pixel pattern portion (an output tile) corresponding to the target pixels to be corrected in the input tile. To derive the output tiles stored in the look-up table, a high resolution bit map is created from an input tile by scaling the input tile. A triangular portion of each convex corner in the high resolution bit map is chopped off, and a triangular portion of each concave corner in the high resolution bit map is filled in. The resulting pattern is then smoothed using a low pass filter. The size of these triangular portions and the extent of low pass filtering are determined using a function based on the vulnerability of a pixel to being eliminated during the above smoothing process.

Abstract: In a method and apparatus for transferring data between a master unit MU, and slave units SU0, SU1 . . . SUX according to a synchronizing signal generated by the master unit MU, the master unit MU outputs information specifying a unit to be a data transferring source, and the unit corresponding to that information transmits data held by the unit itself and the other units so that, data transferring is performed between the units MU, SU0, SU1 . . . and SUX, and it becomes possible for all the units including the master unit to receive data from the data transmitting source.

Abstract: An FSK detector circuit and method which may be utilized for the demodulation of a digital data signal from a modulated sine wave carrier signal. A simple, low parts count FSK detector is disclosed which is readily implemented as an integrated circuit for the detection of a digital data signal in wireless applications without the use of an associated phase locked loop or other frequency detection circuitry.

Abstract: A digital communication network carries high and low priority data. The network stations that produce high priority data are assigned to a first group of stations and stations that produce low priority data are assigned to a second group with the two group not being mutually exclusive. Activity on the network is divided into periodic intervals of the same duration. Network control information, that defines how access to the medium, is determined is broadcast to all stations during a first segment of a periodic interval. The network control information defines the length of the periodic interval and of the periodic interval segments, and defines how many stations are in each group. Then during a second segment of the periodic interval, every station in the first group is afforded an opportunity, in a predefined order, to transmit high priority data over the medium.

Abstract: An input scanner for converting original hard-copy images into digital signals is adapted for efficient scanning of simple "business color" documents. Three linear arrays of photosensors, each linear array corresponding to one primary color, are moved relative to the original image. One linear array of photosensors operates on a full cycle and converts every single scan line of the original image into digital signals. Simultaneously, the other primary-color-sensitive linear arrays operate on half cycles and record only signals corresponding to an evenly-distributed subset of small areas of the original image.

Abstract: A number of detection circuits, one for each source of control signal set inputs, and a high speed resolution circuit, are provided for resolving multiple control signal inputs into a single stable, predictable, and useful output signal. The detection circuits detect active control signals in the various control signal set inputs, and generate detected signals. The high speed state resolution circuit generates an output signal, conditionally changing the output state based on the detected signals and the current state being output. When deciding whether to change the output state, the high speed resolution circuit considers only the detected signals applicable to the current output state and responds accordingly, ignoring all other detected signals that are not applicable. The detection circuits and the resolution circuit are coordinated in timings, ensuring proper resolution.

Abstract: In the event that a radio pager falls into frame async while receiving information, an appropriate code search mode is desirably selected. Firstly, a controller of the pager checks to see if a bit sync indicating signal obtained from a bit synchronizer demonstrates bit sync. If the bit sync indicating signal indicates bit synchronization, the controller selects an operation mode for searching for synchronization code (SC). On the other hand, if the bit sync indicating signal indicates bit async, the controller selects a preamble code search mode. Accordingly, in the case where the pager becomes out of synchronism and immediately thereafter restores same during information acquisition, the pager is able to successfully obtain subsequent information by means of very simplified arrangement.

Abstract: A numerical value (Y-X).multidot.0.5 indicative of a phase angle .theta..sub.1 in the first quadrant is calculated on the assumption that a quadrant of an input vector signal (x+jy) is judged and the signal is rotated into the first quadrant by a rotational vector signal (a+jb) and the phase angle of 0 to .pi. is expressed by 0 to +2 and the phase angle of .pi. to 2.pi. is expressed by -2 to 0 as a prerequisite. Further, a numerical value c indicative of an offset phase angle .theta..sub.2 to return the vector signal into the original signal and the phase number indicative of each of the (N) divided phase regions of the phase plane is directly obtained as bit data.

Abstract: A method and reproduction system for generating image information signals of a second type for each image point, upon supply of digital image information signals of a first type generated in a multi-bit form by a first and second signal source and making use of the information content concerning the density value present in the signals. The second signal source is adapted to generate image information signals in accordance with a predetermined density value. The image information signals of the second type are converted, by the application of grey value processing, to image reproduction signals which are used to control an image reproduction system such as a printer.

Abstract: In transmitting information over a cellular communications channel to an opposite endpoint, a modem's autorating routine is "data-driven." In particular, when the amount of information to transmit to the opposite endpoint is low, the modem's data rate is low e.g., 4800 bps, and the modem's ability to autorate upwards, i.e., fallforward, is disabled. However, when the amount of information to transmit to the opposite endpoint is high the modem's ability to fallforward is enabled so that the modem's data rate can increase to the highest permissible data rate for the cellular channel in order to transmit large blocks of information.

Abstract: A channel equalizer is formed using a self-learning neural network. During a training period, the neural network is taught the channel response function. The network is then used to equalize distortions introduced into signals by the channel. The neural network may be a Boltzmann Machine type of neural network comprising neurons arranged in an input layer, a hidden layer, and an output layer. The neurons are interconnected by bidirectional symmetric weighted synapses. Each neuron is preferably implemented by an analog integrated circuit. Direct communication between the input and output layers helps in faster channel acquisition. The scheme can very easily be extended to multilevel and multisymbol modulation schemes such as QAM and PSK.