Patent ID: 6876927

Claim:
Standalone digital data recorder ( 1 ) of a site background noise, said recorder receiving data from seismological transducers ( 7 , 8 , 9 ), said transducers providing at least a first type of data H and a second type of data V in the form of analogue signals, said recorder comprising: an acquisition and analogue/digital conversion card ( 2 ) according to an acquisition rate, said card comprising at least two analogue channels and a digital output, each analogue channel comprising an input, a programmable gain analogue signals amplifier ( 13 ) and a filter ( 14 ), said filter comprising at least one low-pass function, an analogue multiplexer ( 15 ) being provided between the filters ( 14 ) and an analogue/digital converter ( 16 ), each transducer being connected to a specific channel; a user interface ( 3 ) enabling visualisation ( 17 , 21 , 22 , 23 , 24 ), and input ( 18 , 19 , 20 ) of information; a removable storage device ( 4 ) for storing the data; and a drive unit ( 5 ) comprising an operating programme, said programme comprising a means enabling to set up the recording conditions, the recording and the warning of the end of the recording session, to set up the operating conditions by means of the user interface enabling at least to select the gain, the acquisition rate and the duration of the record, characterised in that the card ( 2 ) comprises moreover on each input an array ( 11 ) for matching the impedance of the corresponding transducer, said array being removable in order to enable manual matching for each new transducer.