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Method and apparatus for automatically identifying a program including a sound signal

DC
  • US 5,574,962 A
  • Filed: 12/20/1994
  • Issued: 11/12/1996
  • Est. Priority Date: 09/30/1991
  • Status: Expired due to Term
First Claim
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1. A method for including an encoded message into a digital sound signal forming at least a part of a program such that the message is inaudible, the message containing data indicating at least one of a broadcasting channel or station providing said program, an identity of said program and a broadcasting date of said program, comprising the steps of separating said digital sound signal into frequency components by digital transform processing, adding the encoded message by modulating the energy of at least one of the frequency components of said digital sound signal in a characteristic manner that is predetermined, composing an output sound signal from the separated frequency components including the frequency component whose energy has been modulated to form an encoded sound signal and at least one of either broadcasting the program including the encoded sound signal or recording the encoded sound signal on a recording medium.

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