| CPC G10L 15/22 (2013.01) [G06F 3/013 (2013.01); G10L 15/14 (2013.01); G10L 15/25 (2013.01); G10L 15/30 (2013.01); G10L 2015/223 (2013.01); G10L 2015/227 (2013.01)] | 20 Claims | 

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               1. A method of presenting a signal to a speech processing engine, the method comprising: 
            receiving, via a first microphone of a wearable head device, an audio signal comprising speech from a user of the wearable head device; 
                identifying a first portion of the audio signal; 
                determining, for the first portion of the audio signal, a first probability that the first portion comprises speech directed by a user as input to the speech processing engine; 
                identifying a second portion of the audio signal, the second portion having a start time in the audio signal and an end time in the audio signal, wherein the first portion comprises speech located before the start time in the audio signal and further comprises speech located after the end time in the audio signal; 
                determining, for the second portion of the audio signal, a second probability that the second portion comprises speech directed by the user as input to the speech processing engine; and 
                in accordance with a determination that the first probability exceeds a first threshold, and further in accordance with a determination that the second probability does not exceed the first threshold: 
              presenting the first portion of the audio signal as a first input to the speech processing engine, and 
                  forgoing presenting the second portion of the audio signal as an input to the speech processing engine. 
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