According to the transient theory of human voice production, the time between two adjacent glottal closing instants accurately defines the pitch period, and the sound waveform in each pitch period contains full information on the timbre of the voice. Therefore, using a pitch-synchronous analysis method, all formant parameters of the voice can be measured from the voice waveforms in each pitch period, including central frequency, intensity, and bandwidth of each formant. The results are independent of input parameters and reproducible. As examples, the formant parameters of five cardinal vowels measured from voice waveforms are presented. Using formant parameters measured from voice waveforms, creative voice synthesis is presented. As an application, creative singing synthesis from a score file and formant parameters is demonstrated.