Instead, the encoder includes circuitry which inhibits the operation of the random pulse generator to the extent necessary to force a particular switching signal mode for a predetermined average time interval. For instance, assuming that it is desired to continue to operate for a while with a rectangular switching signal of the 4C mode as in FIG. 2, it is necessary to reset the seven pulse counter at the mode transition point between time slots 16 and 17. In order for this to occur, the rectangular switching signal must transition from a C state in time slot 16 to a B state in time slot 17 to obtain a C to B transition.
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