Abstract: In a firing angle control system for a converting device for an AC electric motor-vehicle fed with AC electric power and having, as its main electric motor, a DC electric motor, the converting device including a main rectifier connected to the armature and a field rectifier connected to the field winding, an abrupt change in the AC voltage of the converting device is detected and, upon such detection, a main rectifier voltage target signal is corrected to compensate for a difference in the rate of change between the armature current and the field current which would occur if the correction were not made.

Abstract: In a speech synthesizer designed so that natural speech is chopped at constant intervals of time and characteristic parameters of the speech are extracted from the chopped speech and used for synthesis of speech, the number of bits of a characteristic parameter per analytical frame is not changed, but the interval of time of one analytical frame is changed to change the amount of information per unit time, while the time interval of one synthesis frame of the synthesizer is changed with the time interval of one analytical frame so that the time interval of one frame upon analysis and the time interval of one frame upon synthesis are made equal, whereby a single speech synthesizer can handle speech parameters of different amounts of information.

Abstract: This PARCOR-type speech synthesizer replaces a ten-stage lattice type filter with a pipeline multiplier and feedback loop, and provides a loss circuit (for bandwidth broadening) using subtraction circuits for multiplication.