Error free reading system for magnetically recorded data signals - filters out LF interferences and data signals are keyed on two reference potentials

摘要

The signals (1, 2) are esp. coded timing signals on which interference voltages are superposed owing to, e.g., cross-talk from adjacent useful signal channels. Interference voltage frequencies are much lower than those of data signals. Control signals (3, 4) are derived from the rising and/or falling edges of the superposed data signal. The l.f. interference voltages are filtered out from the superposed data signal, and the filtered data signal is keyed in the control signal frequency alternately on two different reference potentials.