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System for simultaneous analog and digital communications over an analog channel

  • US 5,410,541 A
  • Filed: 05/04/1992
  • Issued: 04/25/1995
  • Est. Priority Date: 05/04/1992
  • Status: Expired due to Term
First Claim
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1. A system for simultaneously communicating an analog voice signal and a voiceband digital signal from a sender to a receiver comprising:

  • (a) means, at the sender, for filtering from a voice signal to be transmitted those frequency components used to construct a digital signal to be transmitted resulting in a first interim signal, removal of said frequency components being for the purpose of preventing errors which could be caused by the presence of voice components in the digital signal,(b) means, at the sender, for producing a second interim signal comprising the sum of the first interim signal and the digital signal,(c) means, at the sender, for transmitting the second interim signal,(d) means, at the receiver, for receiving the second interim signal,(e) means, at the receiver, for filtering from the received second interim signal those frequency components used to construct the digital signal,(f) selectable means, at the sender, for bypassing the means at the sender for filtering, the second interim signal comprising the voice signal whenever said selectable means is selected, and(g) selectable means, at the receiver, for bypassing the means at the receiver for filtering.

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