1. A computer-implemented method comprising: selecting a predetermined voice command which, when spoken by a user during a conversation with another person, informs a wearable computer device that an event is occurring, and that prompts the wearable computer device to store an audio clip surrounding the event in a memory for later retrieval; using audio signals received through an environmental microphone of an audio-only user interface of the wearable computer device to generate digital audio data; buffering the digital audio data in a scrolling audio buffer of the wearable computer device for a predetermined period of time; using audio signals received through a personal microphone of the audio-only user interface of the wearable computer device to determine that the user has spoken the predetermined voice command; and responsive to determining that the user has spoken the predetermined voice command, storing the audio clip in the memory for later retrieval, the audio clip including at least a portion of the digital audio data buffered in the scrolling audio buffer before the predetermined voice command was spoken, and at least a portion of the digital audio data buffered in the scrolling audio buffer after the predetermined voice command was spoken.
1. A computer-implemented method comprising: selecting a predetermined voice command which, when spoken by a user during a conversation with another person, informs a wearable computer device that an event is occurring, and that prompts the wearable computer device to store an audio clip surrounding the event in a memory for later retrieval; using audio signals received through an environmental microphone of an audio-only user interface of the wearable computer device to generate digital audio data; buffering the digital audio data in a scrolling audio buffer of the wearable computer device for a predetermined period of time; using audio signals received through a personal microphone of the audio-only user interface of the wearable computer device to determine that the user has spoken the predetermined voice command; and responsive to determining that the user has spoken the predetermined voice command, storing the audio clip in the memory for later retrieval, the audio clip including at least a portion of the digital audio data buffered in the scrolling audio buffer before the predetermined voice command was spoken, and at least a portion of the digital audio data buffered in the scrolling audio buffer after the predetermined voice command was spoken. 9. The method of claim 1 , wherein the predetermined voice command comprises a standard phrase commonly spoken during a conversation between two people while the event is occurring.