1. IN A SYSTEM FOR AUTOMATICALLY READING OUT INFORMATION RECORDED ON A SENSITIZED TAPE, SAID INFORMATION BEING IN THE FORM OF REGULARLY-SPACED REFERENCE PULSES WITH DATA PULSES OCCURRING THEREBETWEEN, THE COMBINATION OF A PLAYBACK HEAD HAVING A GAP LOCATED IN CLOSED PROXIMITY TO A SELECTED PORTION OF SAID SENSITIZED TAPE, A TAPE DRIVING MEANS, A GENERATOR OF CALIBRATION PULSES, SAID CALIBRATIONPULSE GENERATOR BEING STRUCTURALLY DISTINCT FROM SAID TAPE AND OPERATING AS A FUNCTION OF THE OPERATION OF SAID TAPE DRIVING MEANS SO AS TO GENERATE A PREDETERMINED NUMBER OF CALIBRATION PULSES DURING EACH MOVEMENT OF SAID TAPE BETWEEN SUCCESSIVE REFERENCE PULSES, A GATING CIRCUIT ADAPTED TO RECEIVE SAID REFERENCE PULSES AND SAID DATA PULSES UPON MOVEMENT OF SAID TAPE, AND A COUNTER CIRCUIT CONNECTED TO SAID GATING CIRCUIT AND ALSO ADAPTED TO RECEIVE THE OUTPUT OF SAID CALIBRATION-PULSE GENERATOR, WHEREBY SAID COUNTER CIRCUIT IS ACTIVATED BY SAID GATING CIRCUIT WHENEVER THE LATTER RECEIVES A REFERENCE PULSE, AND DEACTIVATES BY SAID GATING CIRCUIT WHENEVER THE LATTER RECEIVES A DATA PULSE, THE NUMBER OF CALIBRATION PULSES RECEIVED BY SAID COUNTER CIRCUIT IN THE TIME INTERVAL BETWEEN THE RECEPTION OF ASSOCIATED REFERENCE AND DATA PULSES BEING INDICATIVE OF THE INFORMATION RECORDED ON SAID STORAGE MEDIUM.