A very high time-resolution pitch detector is proposed. Pitch periods can be very exactly obtained from each pitch. In the frequency domain, the magnitude of second harmonic of voiced speech is 10 dB larger than the fundamental magnitude at most. Therefore the fundamental component is made into the strongest one through a 20-dB/oct FIR low-pass filter. Pitch periods can be obtained from the time interval of filtered voice peaks. The fundamental peaks of the time domain waveform are separated from other false peaks by the dynamic threshold which is defined by the moving average of filtered and half-rectified voice. This method is very useful for analysis and/or processing which need exact pitch periods. In addition, since this method does not have an analysis time window, it has high performance for both high and low pitch speaker.