Abstract: In a speech analysis and synthesis (composing) method, a phoneme transition waveform is generated to smoothly couple phoneme PHA to PHB having different pitch periods. The method involves obtaining the differential value (difference phoneme .DELTA.PH or difference phoneme .DELTA.PHI and difference clock or pitch period), and in composition merely adding phoneme PHA and difference phoneme .DELTA.PHI and clock period and difference clock period.

Abstract: A Doppler radar for use in a vehicle for predicting a collision with another vehicle, capable of detecting noise due to a false wave i.e., the transmitted wave from another vehicle having a frequency in the vicinity of the true transmitted wave frequency and having entered through a receiver antenna into a mixer, and controlling the frequency of the true transmitted wave to depress said noise to zero, thereby avoiding the interference of the false wave with the Doppler signal output.

Abstract: A Doppler radar for forecasting collision, in which three consecutive Doppler signals are obtained by radiating microwave forwardly from the front of a car, the frequency of the microwave being consecutively switched in three steps at a constant interval, and combining the aforesaid microwave and reflected microwave reflected from an object for obtaining intelligence about the distance of the object from the car front, residual time left for the object to reach the car front as well as forecasting collision or non-collision from two of the three Doppler signals and obtaining intelligence about the sense of relative velocity of the object relative to the car front from the remaining Doppler signal and one of the aforesaid two Doppler signals.