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Method and communication system for transmitting information

  • US 20030171130A1
  • Filed: 12/02/2002
  • Published: 09/11/2003
  • Est. Priority Date: 12/03/2001
  • Status: Abandoned Application
First Claim
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1. A method for transmitting information between a transmitter having a PTT-key and a receiver comprising generating an AF signal at the transmitter with speech data from a speech transducer, transmitting the speech data as an RF signal and initiating the transmission by activating the PTT-key, providing additional data for transmission from the transmitter to the receiver and combining the additional data with speech data by suppressing a predetermined portion of an AF speech spectrum of the AF signal, embedding the additional data in the suppressed portion of the AF speech spectrum for the transmission thereof with the speech data, demodulating the received RF signal at the receiver, and using the AF signal received by the receiver.

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