A landing aid device comprises processing means, which receive aircraft path data, and data regarding the position of at least one runway towards which the aircraft is steering. These processing means comprise calculation means which supply a state signal, comprising at least one condition which is dependent on the path data and on the runway data, this function being chosen so as to express the fact that the path of the aircraft converges towards the runway.

Landing aid device, especially for anti-ground-collision alert vetoing

A hybrid numeric-analog clock synchronizer, for establishing a clock or carrier locked to a timing reference. The clock may include a framing component. The reference may have a low update rate. The synchronizer achieves high jitter rejection, low phase noise and wide frequency range. It can be integrated on chip. It may comprise a numeric time-locked loop (TLL) with an analog phase-locked loop (PLL). Moreover a high-performance number-controlled oscillator (NCO), for creating an event clock from a master clock according to a period control signal. It processes edge times rather than period values, allowing direct control of the spectrum and peak amplitude of the justification jitter. Moreover a combined clock-and-frame asynchrony detector, for measuring the phase or time offset between composite signals. It responds e.g. to event clocks and frame syncs, enabling frame locking with loop bandwidths greater than the frame rate.

Method of establishing an oscillator clock signal

Systems and methods for resizing a signal for use with a fixed-point DSP are provided. More specifically, a process called companding is used in conjunction with fixed-point devices to resize a signal to make use of the available range of these devices. In some embodiments, companding is used to improve the signal-to-noise and distortion ratio. Also, information loss associated with quantization and rounding errors can be reduced in some embodiments.

Systems and methods for companding adc-dsp-dac combinations

The transmitter circuit architecture is disclosed based on a phase lock loop architecture and which uses a delta-sigma modulator with 2 point modulation. In order to restrict the bandwidth of the PLL, subsidiary analogue modulation is employed, which requires aligning with the delta-sigma modulation. Alignment of the modulation is accomplished by correction of the sensitivity of the PLL voltage controlled oscillator to modulation by correlating residual modulation in the PLL with the modulated signal input. The action of the modulation correlator trims the modulation and the PLL bandwidth without disturbing the normal operation of the transmitter, and allows the use of modulation bandwidths greater than the PLL bandwidth.

Radio transmitter architecture comprising a PLL and a delta-sigma modulator

The transmitter includes a first bit generator, a modulator, a second bit generator and a bit converter. The first bit generator generates bits to be transmitted based on the first wireless scheme. The modulator for the first wireless scheme performs at least amplitude modulation of a multiple level on the bits generated by the first bit generator. The second bit generator generates a bit to be transmitted based on the second wireless scheme. The bit converter converts the bit generated by the second bit generator and inputs converted bits to the modulator wherein the bit converter converts the bit generated by the second bit generator so that a signal showing High in the second wireless scheme is modulated to amplitude of a high level in the multiple level in the modulator.

Transmitter and receiver

A device for the generation of analog signals by means of analog-digital converters comprises a block for the generation of words encoded on N bits and an analog-digital converter whose input is encoded on M bits, M being smaller than N. The device furthermore comprises a sigma-delta modulator, at the output of the first block, the bus being separated into M most significant bits reserved for the input of the analog-digital converter and N-M least significant bits that enter the sigma-delta modulator, the output of this modulator being an M-bit bus that is added to the M output bits of the word generation block by digital addition means, M being smaller than N.

Device for the generation of analog signals through digital-analog converters, especially for direct digital synthesis

The invention concerns a method and a device for generating a random signal. It also concerns a digital-to-analog converting system using such a signal. The invention also concerns a digital-to-analog converting system using such a random signal. The method comprises at least: a first noise generation step (1); a second noise filtering step (2) to obtain a signal x(t) having a predetermined spectral envelope H(f); a third step (3) wherein a non-linear function g is applied to the signal x(t) so as to produce a signal y(t) approaching a predetermined histogram of amplitudes f(y), the function g being defined by relationship (I) wherein the function P is the histogram of the signal x(t) whereto the third step is applied; a fourth step (4) wherein a pulse response filtering w(t) is applied to the signal y(t) to correct its spectral envelope and obtain an output signal s(t) having the predetermined spectral envelope H(f), the pulse response w(t) being the inverse Fourier transform of a function W of the frequency which is the division of the function H(f) by the module Y2(f) of the Fourier transform of the signal y(t). The invention is particularly useful for direct digital frequency synthesis, for example in the field of radar techniques or that of instrumentation.

Method and device for generating a random signal and digital-to-analog converting systems using same

Device for continuous phase modulation, produced from a frequency synthesizer including a variable oscillator and a phase-locked loop with, in series, a frequency division circuit, a phase comparator and a low-pass filter. In order to reduce modulation in the loop, the modulation is applied not only to the input of the synthesizer but also, in compensation, in the loop. In order to eliminate the modulation residue in the loop, a control signal for the oscillator is derived by a circuit which performs a correlation between the residue of the modulation and the output signal from a filter producing the same filtering effect as the loop, and which receives the modulation signal from the input of the synthesizer.

Device for continuous phase modulation by frequency synthesizer with phase-locked loop

The random signal generation method involves filtering a noise signal to obtain a signal x(t) with a preset spectral envelope H(f) A non-linear function is applied to x(t) to give a signal y(t) approximating a preset frequency histogram f(y) An impulse response w(t) is applied to y(t) to correct its spectral envelope and obtain an output signal s(t) with the preset spectral envelope H(f) Independent claims are included for a generator device to execute the method, and for a digital to analog conversion system using the random signal

Random signal generation method, generating and filtering white noise, with subsequent application of non-linear function and impulse response filtering.

Jean-Luc De Gouy

Papers

Device for the generation of analog signals through digital-analog converters, especially for direct digital synthesis

Method and device for generating a random signal and digital-to-analog converting systems using same

Device for continuous phase modulation by frequency synthesizer with phase-locked loop

Random signal generation method, generating and filtering white noise, with subsequent application of non-linear function and impulse response filtering.

Dispositif de generation de signaux analogiques a partir de convertisseurs analogique-numerique, notamment pour la synthese numerique directe