Abstract: The invention relates to the monitoring, recording and display of a speaker's larynx waveform, for the purposes of education, speech therapy and speech analysis. A pair of electrodes are applied externally to the larynx region of the speaker's neck. Each electrode has two concentric surfaces (the outer surface is called a guard ring). One electrode feeds a carrier voltage to the speaker's neck. The other electrode receives the resultant larynx amplitude-modulated current. Detection techniques are used to derive the larynx waveform. A preferred detection technique is "slicing" which is herein defined as a demodulation which follows the changes in envelope of an amplitude-modulated carrier and retains only the small rapid larynx modulation filtering out the slower neck-movement modulation. The important feature of speech called intonation, which is made up of rhythm and pitch patterns, is directly correlated with larynx frequency.