Abstract:
Apparatus for depacketizing and aligning packetized input data. Data processing means (305) receives the input data via an input memory (301) and detects, identifies and determines payload size of a data packet of the input data. The data processing means (305) generates a payload size signal indicative of the size of the payload. A word formatter (303) receives units of the payload from the input memory (301) and gathers and aligns these to form data words. A payload counter (306) controls flow of input data from the input memory (301) to the word formatter (303) in accordance with the payload size signal. An input buffer (304) receives the data words from the word formatter (303), stores these and transfers them to the data processing means (305) for effecting data processing.
Abstract:
The invention concerns a system for formatting a signal (s(t), (DMTin) in multicarrier modulation, which consists in clipping (18) the signal, in amplitude, with respect to a threshold value (Aclip), and in re-injecting (10), with delay and on a signal to be formatted, a clipping noise (clip) redistributed (19), at least partially, outside the used frequency band (f1-f2) of the multicarrier modulation signal.
Abstract:
According to the present invention circuitry is provided for processing digital data items. The circuitry comprises compression and decompression circuitry. The compression circuitry further comprises: a circuit for transforming M number of data items into N number of data items; a circuit for quantising P number of data items and producing Q number of data items; and a circuitry for appropriately storing in memory and/or transferring R number of data items. The decompression circuitry comprises: a circuit for appropriately retrieving from memory and/or receiving S number of data items; a circuit for dequantising T number of data items and producing U number of dequantised data items; and a circuit for receiving and inverse transforming V number of data items into W number of data items, said W data items being representative of said M data items.
Abstract:
A system for controlling a number of electric devices (14, 15, 17, 18, 28, 28'; 19) on a car (1), particularly those fitted to the vehicle door (2, 2', 3, 3') and comprising at least a window regulator (18), a door lock device (17), a manual control push-button device (14) and a device (15) for electrically controlling an external rearview mirror (16); which devices (14, 15, 17, 18, 28, 28'; 19) comprise at least an electric operating member (24), and which system comprises at least a central processing unit (5) and at least a cable (7, 7', 8, 8') for electrically connecting the central processing unit (5) to the devices (14, 15, 17, 18, 28, 28'; 19); a single electric connecting cable (7, 7', 8, 8') being provided for the devices (14, 15, 17, 18) on each door (2, 2', 3, 3'), and comprising a first wire (10) for supplying positive electrical power, a second wire (11) for transmitting information signals, and a third ground wire (12); which information signals are transmitted over the aforementioned second wire (11) in asynchronous, serial manner; and which devices (14, 15, 17, 18, 28, 28'; 19) comprise a specific electronic control block (27) comprising at least a first integrated circuit (23) for supplying electrical power for operating the aforementioned member (24), and a second integrated circuit (25) for processing information signals relative to operation of the same.
Abstract:
An ATM routing switch for bidirectional transmission of at least two types of cell (61), one type accepting variable bit rate of transmission and a second type accepting some loss of cells in transmission, includes first reserve buffer capacity (160) for cells of the first type, a second reserve buffer capacity (150) for cells of said second type and control circuitry (39, 40, 41) for generating a flow control signal (FCT) if a predetermined threshold for the first buffer capacity (160) is reached by input of cells of said first type, and discarding input cells of said second type if a predetermined threshold for said second buffer capacity (150) has been reached by input of cells of said second type.
Abstract:
An ATM routing switch (21) has a buffer circuit (35) for holding cells located on queues at output ports (30), the buffer having a first reserve buffer capacity (161, 162) for cells of a first type requiring integrity of cell transmission and a first designation for use in determining a permitted path through the network, a second reserve buffer capacity (163, 164) for cells of the first type having a second designation for use in determining a different permitted path in the network and a third reserve buffer capacity (150) for cells of a second type accepting some loss of cells in transmission, flow control circuitry operating to limit input of cells of either the first or second type if predetermined thresholds for the first, second or third buffer capacities are reached.
Abstract:
A multi-level memory circuit for binary information, according to the invention, comprises a plurality (MTX) of memory cells, each adapted to store more than one item of binary information and comprised of at least one floating gate MOS transistor, the information stored therein corresponding to the level of the cell threshold voltage, and a read voltage generating circuit (ALIM) for the cell plurality, adapted to be input a supply voltage (VCC). The generating circuit (ALIM) includes a voltage boosting circuit (CHP) adapted to generate a read voltage (VW) having a higher value than the value of the supply voltage (VCC).
Abstract:
A modular arithmetic coprocessor for performing calculations according to the Montgomery method, and comprising a division circuit for performing integer divisions. The integer division circuit calculates the division of binary data A coded over n' + n" bits by binary data B coded over n bits, with A, B, n, n' and n" being integers other than zero. For this functionality, the division circuit comprises first and second n-bit registers for containing binary data A and the division result, a third n-bit register for containing an intermediate result, a fourth n-bit register for containing binary data B, two subtracting circuits each having first and second serial inputs and a serial output, and a test circuit having an input and an output.