Digital Signal Processing Reference
In-Depth Information
Figure 1-9.
Driver Behaviour Differences between HUM and WOZ navigators.
Average occurrence of filler was 0.15 per phrase in the case of a human
navigator and the corresponding rate was 0.12 per phrase in the WOZ case.
Therefore‚ we can conclude that the average dialogue between a driver and
the WOZ is shorter than that of a human navigator. This tendency is observed
to be fairly uniform across all the LITs under study.
The occurrence rate of filler for “Request(Req)” tags is close to average.
Although other tags show sizeable differences‚ there was not any difference
between the human navigator and then WOZ setup. The differences were
consistently high in other tags. This means that‚ for the “Req” tags‚ subjects
frequently tend to speak regardless of the reply from the system. On the other
hand‚ subjects simply tend to respond to an utterance from the system for
other tags. It is fairly probable that the fluency of the system could affect the
driver's speech significantly.
Finally‚ we could also conclude from the number of phrases per speech
unit that the “Req” tagged units are highly complex sentences in comparison
to other tagged units.
