Surgery – Truss – Pad
Patent
1989-02-13
1990-03-20
Sykes, Angela D.
Surgery
Truss
Pad
128774, A61B 510
Patent
active
049092618
ABSTRACT:
A tracking multielectrode electroglottograph has a number of electrodes that are located about each other in opposed arrays placed on either side of a subject's neck during vocalized speech or singing. Each pair of opposed electrodes within the arrays is coupled to a separate channel of the electroglottograph electronics, which, in turn, provides an output signal which reflects, in large measure, the variation with time of the area of contact between the vibrating vocal folds within the subject's larynx. Each channel has a send circuit containing a signal generator that is isolated from the other channels and which produces a high frequency carrier that is synchronized with the carriers from the other channels so as not to produce beats. Each channel also has a receive circuit with input connected to the output of the respective send circuit and to the respective pair of opposed electrodes. The electrodes and the send and receive circuits can be connected either in parallel or in series with each other. The receive input is connected to an amplitude modulation demodulator, which can be a rectifying envelope detector. The relative amplitudes of the output signals from the associated channels indicate the position of the subject's larynx with respect to the several pairs of electrodes and which signal or signals best represent the variation of vocal fold contact area. Some differences in the spatial patterning of the contact area can also be seen in the differences between the waveforms from the various channels. An additional feature provides an indication of when the output of the electroglottograph is not sufficient for a reliable indication.
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Sykes Angela D.
Syracuse University
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