33. A method, comprising: receiving a digital audio signal; buffering audio samples from the received digital audio signal; performing speech recognition on the buffered audio samples, using a locally-stored vocabulary as a reference, to recognize a target word or target phrase in the buffered audio samples; and when the speech recognition identifies the target word or target phrase in the buffered audio samples, outputting a wake up signal indicating a recognition match and outputting audio samples received subsequent to the buffered samples corresponding to the recognition match; wherein at least one of the receiving, the buffering, the performing, and the outputting is performed at least in part by a first processor circuit.
33. A method, comprising: receiving a digital audio signal; buffering audio samples from the received digital audio signal; performing speech recognition on the buffered audio samples, using a locally-stored vocabulary as a reference, to recognize a target word or target phrase in the buffered audio samples; and when the speech recognition identifies the target word or target phrase in the buffered audio samples, outputting a wake up signal indicating a recognition match and outputting audio samples received subsequent to the buffered samples corresponding to the recognition match; wherein at least one of the receiving, the buffering, the performing, and the outputting is performed at least in part by a first processor circuit. 35. The method of claim 33 , further comprising receiving the wake up signal at a second processor circuit and, in response to receiving the wake up signal, waking the second processor circuit and/or a device associated with the second processor circuit from a power-saving mode to execute a response to the wake up signal.