What is the function of the cockpit voice recorder (CVR)?

The function of the cockpit voice recorder (CVR) is specifically to record audio from the cockpit for incident investigation purposes. This device captures conversations between the flight crew and any other sounds that occur in the cockpit, such as alarms and radio transmissions. The recorded audio is crucial during investigations following incidents or accidents, as it helps reconstruct the events leading up to the occurrence and provides insights into the decision-making process of the flight crew. The data retrieved from the CVR can be vital in determining factors like situational awareness, communication among crew members, and adherence to procedures, all of which are essential for safety analysis and improving future operational protocols.

The other options available relate to functions that are not relevant to the CVR's role. For instance, flight parameter recording pertains to flight data recorders, while video recording and live transmissions to ground control do not fall under the purview of what a CVR does. Therefore, the correct choice clearly highlights the primary purpose of the cockpit voice recorder in aviation safety protocols.