SIMULTANEOUS RECORDING OF ANALOG-SIGNALS, AUDIO AND VIDEO USING A VCR

An interface to record analog signals from DC to 20 kHz on the stereo sound channels of video cassette recorders is described. This interfac e is an effective solution for the implementation of experiments requi ring simultaneous recording of electrophysiological analog data, audio and video signals, since all these data are recorded on the same tape . The system requires the construction of a simple analog interface an d minor modifications internal to the VCR, required to bypass non-line ar elements present on the audio signal path. The particular solution used to adapt for Sony VCR model SLV-575UC is given in full detail. Th e general requirements the other VCR makes and models must fulfil to m ake the adaptation feasible and guidelines for the design of interface s are discussed.