(i) Multiple patterns can be simultaneously synthesized at the central frequency and at an arbitrarily selected

harmonic frequency through the PSO-based strategy by applying the pulse splitting technique.

The young caiman calls of the five best-sampled bays (Bays 9, 21, 35, 46 and 47) were compared regarding their total duration and dominant

harmonic frequency. These parameters were used to perform the CDA in order to differentiate the calls according their bay of origin and to obtain the Mahalanobis distances between the acoustic spaces.

For notes G4 and higher, the second

harmonic frequency 2[f.sub.o] is above 800 Hz, which means that the first resonance of only a few vowels (such as /a/ or /ae/) qualifies for boosting 2[f.sub.o].

It should be mentioned that the high frequency components are mainly distributed near

harmonic frequency modes ([f.sub.n], n is integer), as the mark A1 shown in Figure 8, and the Fourier amplitudes of the other high frequency modes are still tiny, as the mark A2 shown in Figure 8.

Recently, a novel coupling schematic is proposed in [32-34] that exhibits one transmission zero at a

harmonic frequency. Thus, with this coupling scheme, one more transmission zero is added to the filter, which helps to improve the upper stopband performance.

The relationship of unwanted

harmonic frequency and [[omega].sub.0] can be defined as [[omega].sub.h] = n[[omega].sub.0], where [[omega].sub.h] is the unwanted

harmonic frequency and n the rejected harmonic index.

By analyzing wind farm harmonic model, the harmonica contents can be calculated by the software and differing means of reducing the harmonic contents can be found depending on the feature of the harmonic source; moreover, the origin could be traced by

harmonic frequency spectrum when problems occurring in the system.

In the LS sine-fitting algorithm a problem is the evaluation of the initial condition of the fundamental

harmonic frequency, to guarantee the convergence.

where [f.sub.1] is the first

harmonic frequency, fs/2 is the sampling frequency or pulse repetition frequency (PRF) of the radar signature with a positive frequency range, and "[]" is the floor operator that outputs the largest integer not greater than the input value.

Power systems designed to function at 60 Hz in the United States and 50 Hz in many other countries may experience unsatisfactory operation and, in some instances, failure when subjected to voltages and currents that contain substantial

harmonic frequency elements.

Interestingly, the mosquitoes adjust the harmonic resonance of their thoracic box to produce a

harmonic frequency that converges at a frequency that is the female's third harmonic (three times her fundamental frequency) and the male's second harmonic (two times his fundamental frequency).