Patent ID: 8487607

Claim:
A device for digital triggering of a recording of a digitized measurement signal having a superimposed noise signal comprising: an analog/digital converter configured to convert an analog measurement signal with a superimposed noise signal to the digitized measurement signal having the superimposed noise signal, the digitized measurement signal being distorted in a linear or non-linear manner; a filter-type equalizer directly connected to the analog/digital converter for equalizing the digitized measurement signal; a decimation unit directly connected to an output of the filter-type equalizer and configured to compress the output of the filter-type equalizer; a digital recording unit directly connected to an output of the decimation unit, wherein the decimation unit compresses the output of the filter-type equalizer by re-routing to the digital recording unit only every n th sampled value of the output of the filter-type equalizer, where n is 2 or more; a low-pass filter also directly connected to the output of the filter-type equalizer and configured to band limit the noise signal superimposed on the measurement signal; and a digital triggering unit directly connected to the low-pass filter and having an output directly connected to the digital recording unit, the digital triggering unit being configured to receive the measurement signal having the band-limited superimposed noise signal and to trigger the recording of the measurement signal in the recording unit; wherein the digital recording unit comprises a recording-control unit, an acquisition memory, and a display, wherein the recording-control unit is directly connected to the decimation unit and the digital triggering unit, the acquisition memory is directly connected to the recording-control unit, and the display is directly connected to the acquisition memory, wherein the recording-control unit comprises a ring buffer configured to buffer the compressed sampled values of the measurement signal with superimposed noise in a cyclical manner, and wherein the bandwidth of the low-pass filter is adjusted dependent upon edge steepness of the measurement signal.