摘要:
L'invention concerne un générateur (10) d'un signal (out) comprenant une mémoire (12) dans laquelle sont stockées des instructions, chaque instruction comprenant une portion de code (op_code) et une portion d'argument (arg) ; un moyen (20) de lecture successive d'instructions stockées dans la mémoire ; un moyen (14) de décodage adapté à recevoir, pour chaque instruction lue, la portion de code de l'instruction et à fournir un signal d'activation (set_val) qui dépend de la portion de code ; et un moyen (18) de fourniture dudit signal adapté à recevoir, pour chaque instruction lue, la portion d'argument de l'instruction et adapté, en fonction du signal d'activation, à mémoriser la portion d'argument et à fournir ledit signal égal à la portion d'argument ou à fournir ledit signal égal à la portion d'argument précédemment mémorisée.
摘要:
A system, apparatus, method and article to emulate a filter are described. The apparatus may include a digital-to-analog converter (504-1,...504-n) having an impulse response emulator(504-1,...504-n), the impulse response emulator (504-1,...504-n) to receive multiple digital signals each having a predetermined waveform, and convert a sequence of bits from each digital signal to a predetermined analog waveform corresponding to the sequence of bits. The impulse response emulator (510, 710) can include a bit path for each digital signal, with each bit path to include a control logic (504-1,...504-n) and a multiplexer (506-1,...506-n), said multiplexer (506-1,...506-n)to output said predetermined analog waveform using control information from said control logic (504-1,... 504-n).
摘要:
The invention discloses systems and methods for generating pure random numbers from astronomical events, such as cosmic radiation or solar events. The invention includes a detector (110), a logic circuit (120), memory (125), power supply (140) and a communication device (130). The detector may be, for example, a solar wind particle detector, an alpha ray detector, a gamma ray detector, or the like. The memory stores data from the detector. The communication device transmits the data. In addition, the logic circuit applies predetermined mathematical rules to the collected data to generate pure random numbers suitable for use in games of chance, horoscopes, astrology, sound or light displays, or other activities. In addition, the logic circuit may encrypt these random numbers before the numbers are transmitted to a receiving device.
摘要:
While a digital input is oversampled up to eight times to process and the oversample data into a specified digital fundamental waveform with multipliers/adders (4-10) to carry out only folding operation with delay circuits 11-1-11-4 and the multipliers/adders (12-15) to allow the determination of a continuous interpolating value. Thus, it is sufficient to provide no low-pass filter which causes a deterioration in phase characteristics. A limited number of determined interpolating functions are determined to prevent a truncation error in interpolation. An AND gate (2) is used to determine a part of the oversample data as the input data, so that processing and folding operation of digital fundamental waveform is carried out in a very simple processing.
摘要:
A power down system and method for an integrated circuit that enables a power down mode to be maintained for a predetermined time is described herein. The power down system comprises an oscillator, a low power oscillator and an oscillator control circuit controlling both the oscillator and the low power oscillator. The oscillator control circuit including at least one real time counter. The oscillator control circuit being so configured that the oscillator is energized when said oscillator control circuit is in a normal mode and that, when a power down signal is received: a) the oscillator control circuit measures an oscillation frequency of the low power oscillator, b) the oscillator control circuit uses the measured oscillation frequency of the low power oscillator to set the real time counter so as to maintain the power down mode for the predetermined time, c) the oscillator control circuit turns off the oscillator and uses the low power oscillator for the duration of the power down.
摘要:
A digital phase-quadrature oscillator generates a series of sine values representative of a sine wave, and a series of cosine values representative of a cosine wave. In each iteration of the oscillator, a sum of the squares of past sine and cosine values is used as a negative feedback term in synthesizing next sine and cosine values, in order to stabilize the amplitudes of the sine and cosine values.
摘要:
L'oscillateur à commande numérique multiphase (8) est monté notamment dans un récepteur de signaux radiofréquences qui comprend en outre des moyens de réception et de mise en forme (3) des signaux radiofréquences, un étage de corrélation (4) et un générateur de signaux d'horloge. L'oscillateur reçoit à l'entrée un signal d'horloge à une première fréquence (CLK) qui cadence les opérations de l'oscillateur, ainsi qu'un mot binaire à plusieurs bits (Nb) pour fournir au moins un signal de sortie (Mb) à fréquence déterminée sur la base dudit mot binaire et du signal d'horloge. L'oscillateur comprend un premier étage d'accumulation (12) pour un premier nombre de bits de poids fort (Ob) du mot binaire et un second étage d'accumulation (11) pour un second nombre de bits de poids faible (Pb) dudit mot binaire. Le premier étage d'accumulation est cadencé à la première fréquence d'horloge (CLK) pour fournir le signal de sortie (Mb) à fréquence déterminée, tandis que le second étage est cadencé à une seconde fréquence d'horloge (CLK/N) N fois inférieure à la première fréquence d'horloge. Des bits ou signaux binaires de sortie du second étage sont multipliés par N pour être introduits à l'entrée du premier étage tous les N cycles du signal d'horloge à la première fréquence (CLK).
摘要:
A device for generating a spectrally pure waveform of a desired frequency including an oven controlled crystal oscillator (122) for generating a reference frequency signal, a waveform memory (116) containing data on the waveform, a segment determination circuit (120) coupled to the waveform memory (116) for creating segments of the waveform in the waveform memory (116) based on the reference frequency signal and the desired frequency, a programmable memory (124) coupled to the segment determination circuit (120) for receiving and storing the segments of the waveform in dedicated address memories, a digital-to-analog converter (126) coupled to the programmable memory (124) for downloading the address memories of the programmable memory (124) and forming analog signals, and a filtering component (128) for filtering the analog signals to obtain the waveform of the desired frequency.
摘要:
A dither signal source generates a dither signal which is spectrally shaped in a desired manner. One or more notches are located at desired frequencies while minimising the hardware required in a digital signal processor for generating the digital random noise for the dither signal source. The notched dither signal can be added to an analogue signal prior to digitisation to reduce quantisation distortion without adding noise to the frequency range of interest.