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Method for the compatible transmission and/or storage and decoding of an auxiliary signal

  • US 5,712,920 A
  • Filed: 12/17/1993
  • Issued: 01/27/1998
  • Est. Priority Date: 12/05/1992
  • Status: Expired due to Term
First Claim
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1. A method of simultaneously transmitting an audio signal and an auxiliary signal, said auxiliary signal being inseparable from said audio signal, said method comprising the steps of:

  • providing respective audio and auxiliary signals;

    dividing said audio signal into a number of subbands, and encoding respective said sub-bands;

    allocating a loudness information scale factor to said subbands indicative of relative loudness at which corresponding subbands are to be reproduced when decoded;

    inserting said auxiliary signal in one of said subbands;

    establishing said scale factor corresponding to the subband in which said auxiliary signal is inserted, such that said auxiliary signal when reproduced in decoded said audio signal, will be reproduced at an inaudible amplitude, andtransmitting digitally encoded combined audio and auxiliary signal.

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