Abstract: In a modular data acquisition system (4), a module comprises at least one analog-to-digital converter (12) for converting an analog input signal (IN1, IN2, IN3, IN4) into a digital signal (OUT1, OUT2, OUT3, OUT4), and a clock generating circuit (20) for supplying an internal clock signal (209). The module further comprises a connector for plugging in a removable connecting element (3) on the front side of the module (1) in order to connect it to a synchronization bus connecting several modules in said system. A clock selecting circuit (204) enables the selection of either a slave-clock status, wherein the converters (12) are synchronized by an external synchronization signal supplied by said synchronization bus, or of a master-clock status, wherein the converters are synchronized by said internal clock signal which is also used a external synchronization signal on said synchronization bus. Trigger signals can also be transmitted by the synchronization bus and by the connecting elements.

Abstract: The analog-to-digital conversion circuit for high-frequency data acquisition system comprises a plurality of digitizers (6, 9) capable of sampling and digitizing a high-frequency analog input signal (a; w1), the sampling times of the different digitizers being phase-shifted, and a circuit (3, 4, 5, 8, 11) for calibrating the phase shift between a first digitizer and a second digitizer. The phase shift calibration circuit (3, 4, 5, 8, 11) determines a phase shift correction value (u) so as to minimize the difference between a sequence of digital values (ri) determined by the first digitizer (6) and a sequence of corresponding digital values (ui) determined by interpolating the digital values (si) supplied by the second digitizer (9).

Abstract: Data acquisition system comprising a circuit for converting a high-frequency analog input signal (a) into a plurality of digital signals (D1-DN, R) for processing by a digital processing system including at least one digital processor (8) comprising a m-bits digitizer (1), a demultiplexer (2) for delivering in parallel N m-bits sample values supplied in series by said digitizer (1), and a memory (5) for storing the demultiplexed sample values, said memory (5) being accessible by said digital processing system (8). According to the invention, the circuit further comprises a real time digital processing circuit (6) for processing in real time said demultiplexed sample values, capable of supplying processed results to said digital processing system (8). The sampling frequency of said digitizer (1) is greater than the input frequency of said digital processor (8).

Abstract: The circuit for converting a high-frequency analog input signal (a) into a plurality of digital signals (D1-DN) for processing by a digital processor (8) in a data acquisition system comprises: an analog-to-digital m-bits converter (1), a memory (5) for storing the digital data (d1-dN) converted by said converter, said memory being accessible by said digital processor (8), a circuit (6) for analyzing in real time said digital data (D1-DN), capable of modifying the storage address of said digital data (D1-DN) in said memory (5) following the detection of a predefined event in said digital data (D1-DN).

Abstract: In a modular data acquisition system (4), a module comprises at least one analog-to-digital converter (12) for converting an analog input signal (IN1, IN2, IN3, IN4) into a digital signal (OUT1, OUT2, OUT3, OUT4), and a clock generating circuit (20) for supplying an internal clock signal (209). The module further comprises a connector for plugging in a removable connecting element (3) on the front side of the module (1) in order to connect it to a synchronization bus connecting several modules in said system.