摘要:
The invention pertains to an audio frequency ripple control transmitter including a pulsed A.C. rectifier fitted with a capacitive accumulator (2). The transmitter (2) has a LC coupling device for oscillatory circuits (12), whereas the pulsed A.C, rectifier (4) is provided with a capacitive accumulator (6) and an adjustment and control device (10) comprising an adjustment unit (16) and a pulse-width modulator (18), at the outputs of which control signals (S1......, S6) from the pulsed A.C. rectifier (4) wait for processing. Said adjustment unit (16) is comprised of a ripple control regulator (22) and an A. C. regulator (24) which are connected at the output by a summing point (28) linked at the output to the pulse-width modulator (18). The resulting audio frequency ripple control transmitter (2) is cost-optimal and its investment and commissioning cost is clearly lower in comparison with a conventional audio frequency ripple control transmitter.
摘要:
A system for, and method of, generating a spread spectrum code position modulated waveform and a wireless local area network (LAN) containing the system or the method. The system includes: (1) a spread-spectrum encoder that receives and encodes portions of an information signal with a multi-chip code having a predetermined length to create therefrom a stream of sequences, each of the sequences having the predetermined length and (2) a transmitter that periodically transmits the each of the sequences at a time interval that differs from the predetermined length, a data rate of transmission of the information signal thereby allowed to increase.
摘要:
An impulse radio transceiver for full duplex ultrawide-band communications. The transceiver comprises an impulse radio transmitter to transmit impulse radio signal pulses, an impulse radio receiver to receive impulse radio signal pulses, and means, associated with either or both of the impulse radio transmitter and the impulse radio receiver, for synchronizing the transmission and the reception of the impulse radio signal pulses for pulse interleaved communications. Pulse interleaving avoids self-interference between the transmitted impulse radio signal pulses and the received impulse radio signal pulses. In addition to pulse interleaved communications, bursts of pulses can be transmitted between two transceivers in an interleaved fashion. Alternatively, two different pulse repetition rates are to be used to transmit and receive impulse radio signal pulses simultaneously. A blanking means for blanking selected pulses of the received or transmitted impulse radio signal pulses can be used to avoid interference.
摘要:
A time domain communications system (10, 96) wherein time modulated (220), impulse derived signals are multiplied (226) by a template signal (234), integrated (248), and then demodulated (254, 258, 260). By this process, usable signals (262) are obtained which would be otherwise obscured by noise.
摘要:
The figure shows a transmitter (10), where an oscillator (12) generates a base frequency of 100 kHz to be fed into a divide-by-four unit (14). The divide-by-four unit (14) produces a 25 kHz output signal to be fed into the regulated power supply (16). The output of the regulated power supply (16) is fed into the output stage (18) of transmitter (10) for transmission. The impulse antenna (200) creates a monocycle. This system recovers signals otherwise obscured by noise.
摘要:
La figure représente un émetteur (10), dans lequel un oscillateur (12) produit une fréquence de base de 100 kHz devrant être appliquée à une unité de division par quatre (14). Ladite unité de division par quatre (14) émet un signal de sortie de 25 kHz qui doit être introduit dans l'alimentation de puissance régulée (16). La puissance de sortie de l'alimentation de puissance régulée (16) est amenée dans l'étage final (18) de l'émetteur (10) pour la transmission. L'antenne à impulsions (200) crée un monocycle. Ce système permet de récupérer des signaux normalement couverts par le bruit.
摘要:
Procédé de codage d'un signal numérique, codeur et décodeur pour la mise en oeuvre de ce procédé, procédé de régénération et régénérateur correspondant. Un détecte, à chaque temps bit, la présence éventuelle d'un motif binaire parmi un nombre quelconque n de motifs binaires comprenant au moins deux bits ; on divise ledit temps bit en n intervalles de temps égaux auxquels on associe n positions temporelles ; on établit une correspondance entre chacun des n motifs binaires et chacune des n positions temporelles ; on engendre, en cas de présence de l'un des n motifs binaires, une impulsion occupant une position temporelle correspondant audit motif binaire et on reporte la prochaine détection de présence éventuelle d'un motif binaire à partir du bit suivant le dernier bit dudit motif binaire dont la présence est détectée. Application à la transmission numérique.