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Device for entertainment during driving of a car

  • US 8,457,323 B2
  • Filed: 10/31/2008
  • Issued: 06/04/2013
  • Est. Priority Date: 11/02/2007
  • Status: Active Grant
First Claim
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1. Device to be plugged into an electric socket in a vehicle, the socket constituting a part of an electrical system of the vehicle, the device comprising:

  • a sensor to detect, without any other connection than the electrical socket, an engine speed of the vehicle from electrical pulses unintentionally emitted from a generator, electric motor or ignition system of the vehicle, anda signal processor to convert the detected engine speed to sound signals, said signal processor, being configured to identify regular speed-generated pulses, filtering off sudden pulses other than pulses that have the engine speed as a source, and, in cases when the signal processor cannot calculate a given speed from the incoming pulses, taking a lowest pulse frequency that is unchanged over a certain time, and use the lowest pulse frequency as a benchmark for normal idling speed.

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