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Microphone comprising integral multi-level quantizer and single-bit conversion means

  • US 7,630,504 B2
  • Filed: 10/08/2004
  • Issued: 12/08/2009
  • Est. Priority Date: 11/24/2003
  • Status: Active Grant
First Claim
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1. A digital microphone comprising:

  • a microphone housing having a sound inlet and comprising;

    a transducer element comprising a displaceable diaphragm and adapted to generate a transducer signal representative of sound received through the sound inlet,an analog-to-digital converter comprising a multi-level quantizer operatively coupled to the transducer element to convert the transducer signal into multi-bit samples representative of the transducer signal, the multi-level quantizer having at least three discrete quantization levels, each of the discrete quantization levels being represented by a set of corresponding symbols, each symbol comprises a number of one signs, the number of one signs being proportional with a magnitude of the transducer signal represented by the corresponding multi-bit sample,a digital signal converter adapted to convert the multi-bit samples into an unformatted single-bit output signal, andan externally accessible terminal adapted to provide the unformatted single-bit output signal.

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