Synchronization between devices in emergency vehicles

An emergency sound generation system comprising:

• a global time source configured to transmit periodic pulse signals and synchronization messages, wherein the periodic pulse signals and the synchronization messages are compared to adjust a current local time to a global time;
• a first emergency sound generation node, wherein the first emergency sound generation node compares timestamps in the synchronization messages to set a first global time, and generates a first tone signal based on a first output sequence;
• and
• a second emergency sound generation node, wherein the second emergency sound generation node compares timestamps in the synchronization messages to set a second global time, and generates a second tone signal based on a second output sequence;
• wherein the first tone signal and the second tone signal are synchronized by the global time and the first and second global time.

A method of generating synchronized emergency sounds, comprising:

• comparing, by the first emergency sound generation node, timestamps in synchronization messages to set a first global time;
• generating, by the first emergency sound generation node, a first tone signal based on a first output sequence;
• comparing, by the second emergency sound generation node, timestamps in the synchronization messages to set a second global time;
• and
• generating, by the second emergency sound generation node, a second tone signal based on a second output sequence;
• wherein the first tone signal and the second tone signal are synchronized by the first and second global time.