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Host signal processor modem and telephone

  • US 6,252,920 B1
  • Filed: 06/08/1999
  • Issued: 06/26/2001
  • Est. Priority Date: 07/09/1996
  • Status: Expired due to Term
First Claim
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1. A communication system comprising:

  • a host computer which includes native audio hardware capable of generating audible output from the host computer, wherein the native audio hardware processes digital samples according to a first sampling clock;

    a communication device that processes digital samples according to a second sampling clock which is asynchronous to the first sampling clock, wherein the communication device comprises;

    an interface coupled to the host computer;

    an analog-to-digital converter coupled to the interface, the analog-to-digital converter converting an analog signal from an input line to digital samples accessible by the host computer through the interface; and

    a digital-to-analog converter coupled to the interface, the digital-to-analog converter converting digital samples from the interface into an analog signal transmitted on an output line; and

    software executed by the host computer, the software transferring the digital samples from the communication device to the native audio hardware which plays the digital samples, wherein the software comprises;

    a first procedure which transfers digital samples from the communication device to a buffer in a memory of the host computer, wherein the procedure duplicates or deletes samples to equalize a data transfer rate from the communication device and a data transfer rate to the audio hardware; and

    a second procedure which transfers digital samples from a second buffer in the memory of the host computer to the communication device, wherein the second procedure duplicates or deletes samples to equalize a data transfer rate to the communication device and a data transfer rate from the audio hardware.

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