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Transmission of data by ultrasound

  • US 6,950,681 B2
  • Filed: 12/29/2000
  • Issued: 09/27/2005
  • Est. Priority Date: 06/29/1998
  • Status: Expired due to Term
First Claim
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1. A method for transmitting voice data between a head part and a base part of a hands-free telephone, which comprises:

  • compressing information, being the voice data, to be transmitted using compression coding;

    digitizing the compressed information;

    spreading the digitized information over a wider frequency band using a CDMA technique;

    performing a digital to analog conversion on the spread digitized information;

    converting the digital to analog converted spread information into an ultrasound signal;

    transmitting the ultrasound signal via an air interface;

    at a receiver component, receiving the transmitted ultrasound signal and converting the received ultrasonic signal into an analog electrical signal;

    performing an analog to digital conversion on the analog electrical signal;

    despreading the analog to digital converted signal using a CDMA technique; and

    decoding the despread analog to digital converted signal.

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