Abstract: The wavelet neural network employed in signal recognltion is presented and ap-plied to recognltion of the UVspectra of tyrosine, 3, 4-dihydroxyphenylalanine and tryto-phane. In the network, Morlet mother wavelet and line search conjugate gradient optimiza-tion method are used- The convergence speed is fast and the error of learning sets drops to 0.000073 only through 8 iterations. The error of testing patterns is 0.000064- The recogni-tion results(shown in Table 1)show that the sets of spectra can be well recognized by using the wavelet neural network.

Key words: Wavelet neural networks, UV spectra, Recognition