Ford Authority

Ford Patent Filed For Vehicle Sound Emission Control System

Ford Motor Company has filed a patent for a vehicle sound emission control system, Ford Authority has learned.

The patent was filed on October 15th, 2020, published on November 1st, 2022, and assigned serial number 11488472.

The Ford Authority Take

Over the past several months, Ford has filed a handful of patents related to sound and police vehicles, specifically, including one for a vehicular pest repellent system, a vehicular bailout detection and mitigation system, and a system that would combat K9 police vehicle climate control hacking. Now, this new Ford patent outlines an idea for a vehicle sound emission control system, which combines those two worlds into one singular entity.

This particular Ford patent presents an idea for a system that’s capable of detecting the speed of other vehicles by using a frequency that is sent from another vehicle. The system can then change the frequency of the sound to match the speed of the vehicle, which is done for one specific purpose – to mitigate the Doppler effect, a phenomenon that occurs when a wave emitted from a source at a given frequency will be received by an observer at a different frequency if that person is moving relative to the source.

As this Ford patent points out, anyone who has heard a siren or horn from a moving vehicle has experienced this effect, as the sound of the vehicle moving towards us has a higher pitch than it would if the person and the vehicle are both stationary and next to each other. As such, the desired effect – ensuring that bystanders can hear that siren and where it’s coming from – could be achieved via the system outlined in this patent.

We’ll have more on this and all Ford patents soon, so be sure and subscribe to Ford Authority for the latest Ford trademark news, Ford business news, and non-stop Ford news coverage.

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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  1. billc

    Doesn’t make sense to me. I would rather hear the change in pitch to determine if the emergency vehicle is coming toward me or away from me.
    I believe a better approach would be for every emergency vehicle to have a special low power transmitter that activates when the siren is on and all non emergency vehicles would have a receiver that would detect the transmitter, interrupt any audio system(radio, cd or cell phone) in the non emergency vehicle and sound a special tone to let the driver know there is an emergency vehicle within (x) number of feet the non emergency vehicle.

    1. Arcee

      No. Interrupting/jamming signals is not the answer. There is a reason the FCC bans jammers.

      1. billc

        You missed the point, I wouldn’t call it jamming, it more like an alert that pops up on your phone or TV to let you know of an emergency situation. When these type of alerts are sent it over rides the current function you are using or watching/listening to. It would be a low power signal that would only affect vehicles within a few hundred feet of the emergency vehicle.
        It would not jam anything.


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