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1. An apparatus comprising a vehicle configured for travel along a road, the vehicle comprising a cabin in which at least one occupant rides and an inbound audio channel, said inbound audio channel comprising an external-microphone set that includes one or more microphones disposed to receive a raw audio signal that represents sound from outside said cabin and an internal-loudspeaker set that comprises one or more loudspeakers disposed to radiate sound into said cabin in response to said external-microphone set having received said raw audio signal, and a signal processor that is configured to apply a filter to said raw audio signal to generate a filtered audio signal that is then broadcast into said cabin using said internal-loudspeaker set, wherein said raw audio signal comprises a first type of signal and a second type of signal, wherein said signal processor is configured to transition between broadcasting said raw audio signal into said cabin in response to having identified said first type of signal in said raw audio signal and broadcasting said filtered signal into said cabin in response to having failed to identify said first type of signal in said raw audio signal, wherein said signal processor is configured to process said filtered audio signal to include said first type of signal and to suppress said second type of signal.
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