Interior rearview mirror system for vehicle

  • US 9,278,654 B2
  • Filed: 04/20/2012
  • Issued: 03/08/2016
  • Est. Priority Date: 11/24/1999
  • Status: Expired due to Term
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First Claim
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1. An interior rearview mirror system suitable for use in a vehicle, said interior rearview mirror system comprising:

  • an interior rearview mirror assembly comprising a mirror head;

    wherein said mirror head comprises a reflective element;

    wherein said reflective element comprises at least one transparent substrate with a mirror reflector disposed at a surface thereof;

    wherein said mirror head comprises a first microphone operable to generate a first analog signal;

    wherein said mirror head comprises a second microphone operable to generate a second analog signal;

    at least one analog to digital converter;

    wherein said first analog signal is converted to a first digital signal by said at least one analog to digital converter and wherein said second analog signal is converted to a second digital signal by said at least one analog to digital converter;

    a digital sound processor, wherein said digital sound processor is operable to process said first and second digital signals;

    wherein, responsive to said processing of said first and second digital signals, said digital sound processor generates a digital output, and wherein said digital output, at least in part, distinguishes a human voice present in the vehicle from noise present in the vehicle;

    wherein said digital output of said digital signal processor comprises an input to an audio system of the vehicle that transmits wirelessly to a remote receiver;

    wherein said system is operable to enhance human voice to noise ratio to enhance clarity of the wireless transmission to the remote receiver; and

    wherein said processing by said digital signal processor of said first and second digital signals to enhance human voice to noise ratio and clarity utilizes (a) electronic noise cancelation comprising destructive interference and digital audio filtering and (b) at least one of (i) sound insulation for said first and second microphones and (ii) an acoustic wave guide for said first and second microphones.

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