Low cost storing of two electrical biosignals from DC to 20 kHz at more than 80 dB dynamic range.

An instrumentation for storing electrical analog signals (DC to 20 kHz) was composed from a video recorder and a slightly modified pulse code modulation processor. As these components are mass products of the consumer electronics industry, the system price could be kept below 5000 DM. The setup allows one to register simultaneously two signals at DC to 20 kHz at a dynamic amplitude resolution of 16 bit [corresponding to a signal to noise ratio (S/N-ratio) of 96 dB] and AC-signals on the audiochannels of the stereo-video recorder. This is exemplified by recordings of insect chemoreceptors.