Abstract: An uplink subsystem for use in an illumination system arranged for optical communication as well as the illumination system, the system comprising a downlink subsystem and the uplink subsystem. The uplink subsystem comprises sensors (e.g. infrared sensor) embedded in each luminaire in the group. The uplink subsystem also comprises a demodulator, and a distribution network for supplying the signals sensed to an adaptor to combine instances of the sensed uplink signal in a manner that takes into account a Time Division Medium Access scheme and a demodulator to demodulated the combined signal. The system further comprising a downlink subsystem that in turn comprises a modulator for generating a modulated waveform, and an optical fiber distribution network to distribute the modulated waveform to each luminaire in a group. Each such luminaire generates a drive current for driving a lighting element of that luminaire to emit light.

Abstract: An uplink subsystem for use in an illumination system arranged for optical communication as well as the illumination system, the system comprising a downlink subsystem and the uplink subsystem. The uplink subsystem comprises sensors (e.g. infrared sensor) embedded in each luminaire in the group. The uplink subsystem also comprises a demodulator, and a distribution network for supplying the signals sensed to an adaptor to combine instances of the sensed uplink signal in a manner that takes into account a Time Division Medium Access scheme and a demodulator to demodulated the combined signal. The system further comprising a downlink subsystem that in turn comprises a modulator for generating a modulated waveform, and an optical fiber distribution network to distribute the modulated waveform to each luminaire in a group. Each such luminaire generates a drive current for driving a lighting element of that luminaire to emit light.

Abstract: An RF receiver comprising: an amplifier configured to receive an RF signal over an input bandwidth and to provide an amplified RF signal; an equalizer circuit connected to the amplifier to receive the amplified RF signal and configured to provide an equalized RF signal; a converter module connected to the equalizer circuit and comprising an analog to digital converter configured to convert the equalized RF signal to a digital signal; and a digital signal processing module connected to the receiver module and configured to process the digital signal to provide a plurality of channels at an output of the receiver, wherein the digital signal processing module is further configured to process the digital signal to determine a measure of tilt in the RF signal across the input bandwidth and is connected to the equalizer circuit to provide a control signal for adjusting the measured tilt.

Abstract: A radio receiver comprises an input (14) for a modulated radio frequency signal, a frequency down converter (16) coupled to the input, the frequency down converter including quadrature mixers (32,34) for demodulating a received modulated radio frequency signal using a local oscillator signal. An analogue-to-digital converter (54, 56) is coupled to receive demodulated signals from the mixing means. The analogue-to-digital converter, which may comprise a continuous time sigma delta converter, has an input for a sampling clock frequency (f s). A voltage controlled oscillator (38) provides the local oscillator signal and supplies a frequency divider (60, 94) used to provide the sampling clock frequency.

Abstract: An RF receiver comprising: an amplifier configured to receive an RF signal over an input bandwidth and to provide an amplified RF signal; an equalizer circuit connected to the amplifier to receive the amplified RF signal and configured to provide an equalized RF signal; a converter module connected to the equalizer circuit and comprising an analog to digital converter configured to convert the equalized RF signal to a digital signal; and a digital signal processing module connected to the receiver module and configured to process the digital signal to provide a plurality of channels at an output of the receiver, wherein the digital signal processing module is further configured to process the digital signal to determine a measure of tilt in the RF signal across the input bandwidth and is connected to the equalizer circuit to provide a control signal for adjusting the measured tilt.

Abstract: A radio receiver comprises an input (14) for a modulated radio frequency signal, a frequency down converter (16) coupled to the input, the frequency down converter including quadrature mixers (32, 34) for demodulating a received modulated radio frequency signal using a local oscillator signal. An analogue-to-digital converter (54, 56) is coupled to receive demodulated signals from the mixing means. The analogue-to-digital converter, which may comprise a continuous time sigma delta converter, has an input for a sampling clock frequency (f s). A voltage controlled oscillator (38) provides the local oscillator signal and supplies a frequency divider (60, 94) used to provide the sampling clock frequency.

Abstract: The present invention relates to a device for connection of a digital apparatus on a telephone line, comprising a line interface (6) which is connected to the telephone line, and a control circuit (8) to control this line interface (6), which can detect a fault in transmission through the line, the line interface (6) and the control circuit (8) each comprising at least one memory (42, 44, 62,64), and exchanging digital information via a galvanic connection.

Abstract: The present invention relates to a method for synchronisation of at least one first device or apparatus (6) with at least one second device or apparatus(7), comprising respectively a first (8) and a second (10) counter modulus n, and which are designed to exchange data by means of a galvanic connection.

Abstract: An adapter circuit PSA includes a comparator module OA, and a regulation module RM for normally adjusting the value of an output voltage Vout intended to be applied to an external circuit to a predetermined nominal regulation value Vreg0. In response to a measuring module SC sensing a reverse current flow at the output which is produced when an external power supply source in the external circuit connected to the output of the adapter circuit PSA includes an effective voltage source Vext which imposes on the output a voltage VDD which has a higher value than the nominal regulation value Vreg0, feedback coupled to an input to the comparator module OA is activated to raise the value to which the output voltage VDD is regulated to equality with the value of the effective voltage source Vext, thereby nulling the output current.

Abstract: A circuit comprising a transistor (T1) is connected in series to a resistor (RM) for measuring the line current; the whole is connected to the terminals (1,2) of the line. According to the invention, a light-emitting diode (18) is connected in series to a variable current source (20), the whole being connected in parallel to the emitter/collector path of the transistor (T1), and the variable current source, which receives a monitoring signal that represents the line current, produces a current that varies between a zero current and a maximum current for an average line current that varies between a low threshold and a high threshold.