Digital speaker driving apparatus

  • US 9,693,136 B2
  • Filed: 10/21/2015
  • Issued: 06/27/2017
  • Est. Priority Date: 06/16/2008
  • Status: Active Grant
First Claim
Patent Images

1. A headphone apparatus having a digital signal source from a mobile electronic device comprising:

  • a digital speaker having s number of digital signal terminals; and

    a digital speaker driving apparatus connected to the mobile electronic device and driving the digital speaker including;

    a Δ

    Σ

    modulator modulating a digital input signal inputted from the mobile electronic device and outputting an n bit digital signal;

    a post filter connected to the Δ

    Σ

    modulator and outputting an m bit digital signal obtained by miss-match shaping the n bit digital signal; and

    s number of driving circuits corresponding to the s number of digital signal terminals, one part of the m bit digital signal being inputted to the s number of driving circuits and the s number of driving circuits outputting a digital signal,wherein the s numbers of both the digital signal terminals and the driving circuits are less than a number of discrete values represented by a number of bits of the digital input signal inputted from the mobile electronic device.

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