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Bidirectional audio communication in reader devices

  • US 8,931,699 B1
  • Filed: 03/31/2014
  • Issued: 01/13/2015
  • Est. Priority Date: 12/11/2013
  • Status: Active Grant
First Claim
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1. A card reader comprising:

  • a memory;

    a read module configured to read payment information from a financial payment card;

    an audio plug comprising a right audio channel, a left audio channel, and a microphone channel, the audio plug configured to communicatively and mechanically couple the card reader to a mobile device;

    a processor coupled to the read module and the memory, wherein the processor is configured to send information to, and receive information from, the mobile device;

    a conditioning module coupled to the right audio channel and the left audio channel, the conditioning module configured for standardizing voltage levels of incoming analog signals received at the conditioning module from the mobile device based on a training sequence received from the mobile device, wherein the training sequence comprises a predetermined AC waveform; and

    an analog to digital converter (ADC) coupled to the processor wherein the ADC is configured for receiving audio signals from the mobile device and converting the audio signals into digital signals for transmission to the processor, and a digital to analog converter (DAC), wherein the DAC is configured for receiving digital signals from the processor and converting the digital signals into audio signals for transmission to the mobile device.

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