Host signal processor modem and telephone

  • US 5,940,459 A
  • Filed: 07/09/1996
  • Issued: 08/17/1999
  • 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 audio hardware processes digital samples according to a first sampling clock;

    a communication device comprising;

    an interface coupled to the host computer; and

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

    samples from the communication device are transferred to a location the buffer, indicated by a first index;

    samples are transferred to the audio hardware from a location in the buffer, indicated by a second index; and

    the procedure compares the first index to the second index and determines from a difference between the first and second indices whether to duplicate or delete samples being transferred to the buffer.

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