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Transmission system with improved tone detection

  • US 5,982,874 A
  • Filed: 01/23/1997
  • Issued: 11/09/1999
  • Est. Priority Date: 01/26/1996
  • Status: Expired due to Fees
First Claim
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1. A transmission system comprising a terminal and a transmitter for transmitting simultaneously a plurality of tone signals via a transmission medium to the terminal, said terminal comprising:

  • strength measuring means for deriving tone strength measures for said plurality of tone signals; and

    decision means for deciding on the presence of a plurality of tone signals if a combined strength measure of the plurality of tone signals exceeds a first threshold value, and individual strength measures of the tone signals involved exceed a second threshold value, said first threshold value being greater than the product of the number of tones in said plurality times the second threshold.

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