Patent ID: 7480328

Claim:
A signal generator comprising: a baseband unit configured to generate a digital baseband signal; an I/Q modulator configured to modulate the digital baseband signal; a recording memory configured to record a time segment of the digital baseband signal in a state prior to modulation by the I/Q modulator; at least one or more signal modification units provided between the baseband unit and the I/Q modulator, wherein the signal at the input and output of each signal modification unit is routed via switching devices to the recording memory without further modification of each signal between each signal modification unit and the recording memory; a visual display device configured to display the digital baseband signal stored in the recording memory in a predeterminable display mode, wherein the visual display device is configured to display the digital baseband signal in the state prior to modulation by the I/Q modulator, wherein an I input of the recording memory can be connected via a first switching device and a Q input of the recording memory can be connected via a second switching device having a plurality of positions in the signal path of the I component or the Q component; a plurality of decimation units coupled to the recording memory and configured to decimate the data stream of the digital baseband signal, wherein a third switching device is coupled between a first one of the decimation units and the I input of the recording memory, and a fourth switching device is coupled between a second one of the decimation units and the Q input of the recording memory.