Certain human languages have a derived form in which sound is generated by whistling. The information found in syllabic portions of speech is usually conveyed in whistle language by the frequency of the whistle as it mimics either the fundamental frequency (for tones) or the second formant (for vowel qualities) in speech. Some of these whistle languages include consonant articulations. This paper describes techniques for hand synthesis of whistled [t] and [k]and automatic analysis—synthesis of whistle stops using Wm. Henke's MITSYN system. Characteristic bursts and frequency transitions for stops during bilabial whistling are discussed and compared to bursts and transitions in speech. [Work supported by NIH Grant NS 04332.]