10. The method of claim 9 , further comprising training a second level hotword detector for detecting a second portion of the voice command that has been designated as a hotword.
11. The method of claim 10 , further comprising: receiving a subsequent voice command; detecting the first portion of the voice command that has been designated as a hotword in the subsequent voice command; in response to detecting the first portion of the voice command that has been designated as a hotword in the subsequent voice command, detecting the second portion of the voice command that has been designated as a hotword in the subsequent voice command; and in response to detecting the second portion of the voice command that has been designated as a hotword in the subsequent voice command, triggering a response to the subsequent voice command.