| 摘要 |
A audio communication system for a vehicle includes a primary audio source producing a primary audio signal, a secondary audio source producing a secondary audio signal, a speaker, a vehicle ignition switch having an on position and an off position, and a relay. The primary and secondary audio sources may be alternatively transmissibly connected to the speaker by the relay. The relay receives the primary audio signal and transmits substantially the primary audio signal to the speaker when the vehicle ignition switch is in the on position and the secondary audio signal is not present. The relay receives the primary and secondary audio signals and transmits substantially the secondary audio signal to the speaker when the vehicle ignition switch is in the on position. The relay receives the secondary audio signal and transmits substantially the secondary audio signal to the speaker for a predetermined period of time after the vehicle ignition switch has been switched from the on position to the off position. The audio communication system may be used by receiving a primary audio signal from a primary audio source in a vehicle, driving a speaker with the primary audio signal, receiving a first secondary audio signal from a secondary audio source in the vehicle, interrupting the primary audio signal and driving the speaker with the first secondary audio signal, turning an ignition of the vehicle off, starting a predetermined period of time, receiving a second secondary audio signal from a secondary audio source within the predetermined period of time, and driving the speaker with the second secondary audio signal.
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