1. A method of embedding a watermark in an electronic audio signal, the method comprising: with a programmed processor, classifying the audio signal according to audio type; the classifying including analyzing the audio signal to detect a voiced and an unvoiced sound; based on the audio type, selecting with a programmed processor an audio perceptual model adapted for a detected voiced or unvoiced sound and insertion method; and with a programmed processor, inserting a watermark of an audio watermark type in the audio signal according to the selected perceptual model.