Methods, apparatus, and articles of manufacture to generate voices for artificial speech are disclosed. An example apparatus includes a component storing an identifier, the identifier uniquely identifying the apparatus from a plurality of apparatus, an artificial speech generator to generate a first artificial speech signal representing text, the first artificial speech signal generated based on the identifier which is represented by frequency dependent bits by assigning specific bits to specific frequency bands, the first artificial speech signal audibly different from artificial speech signals generated by respective ones of the plurality of apparatus for the text, and an output device to output an audible signal representing the first artificial speech signal.