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exhibited voicelessness during part of the period of closure. I will discuss these points in
turn.
First, I consider the signal amplitude during the period of closure of Mono
implosives. Speaker K produced the possible words =>= =>=, =>= == ==, == == =@= =@=, =@= and == ==, == == shown in
Figures 8.7-8.10. (In addition, spectrograms of =>= =>= =>= and == == == == are given in Figures 8.11 and
8.12.) Here, we see the same general amplitude patterns as those observed by Lindau. For
the tokens with plosive consonants, =>= =>= and =@= =@=, =@= there is a gradual decrease in signal
amplitude from the beginning to the end of the closure. For the tokens with implosive
consonants, == == == == and == ==, == == there is a gradual increase in signal amplitude. Note that this
augmentation in signal amplitude does not begin at the start of closure, but rather begins
about one third of the way into the closure. This augmentation of signal amplitude is
evident in the spectrogram as well. In Figure 8.12, we can see the presence of formant
bands during the second half of the closure period for F1, F2, F3, and F4.
Figure 8.7: Waveform of the possible word =>= =>= (Speaker K).
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