invert the detected signal for presentation to nand circuit 174 when the recording playback unit is first placed in the splice finding mode capacitor 104 will be discharged through the diode 102 and the comparison circuit 90 when comparison circuit 90 is first driven high capacitor 104 will be charged through resistor 100 accordingly nand circuit 174 will inhibit the passage of detected splice pulses until such time as capacitor 104 has become charged this is to prevent stopping of the recording playback unit 2 as a result of false pulses generated when the solenoid 22 is first energized resulting either from transients in the system due to the capstan motor or the solenoid or a splice which is partially located between the capstan and pinch roller upon the initiation of system operation nand circuit 174 also operates to prevent placing the recording playback unit 2 in a stop mode unless the splice finding mode has been called into play however when the splice finding mode has been called into play and when following activation of the solenoid 22 a detected pulse is processed by means of transistor 172 the output of nand circuit 174 will be driven low if enabled by nand circuit 120 this change in state will cause the output of and circuit 122 to go low signifying that a splice has been located and causing the recording playback unit 2 to stop by driving the stop terminal of logic circuitry 42 low it is to be noted that nand circuit 120 receives an input from inverter 118 to indicate initiation of.