TODAY’S PATENT – TRAFFIC VERIFICATION SYSTEM
Today’s invention was invented by Jeffrey L Pages, Glen F English on 29th June, 2004 bearing patent No. US6757300B1.
The automatic identification of audio signals, particularly broadcast audio signals. Companies that invest in television commercials to promote their products or services may find this information especially helpful. A business can use this data to track how frequently and when its commercials are shown over the course of a certain period of time. Thus, they may monitor the broadcasts to make sure they are receiving what they paid for.
A method and apparatus for inserting a data signal into an audio signal to provide a tagged signal. The method includes removing a band of frequencies centred at a predetermined notch frequency from the audio signal, spectrally shaping the data signal so that it takes on the precise shape and magnitude of the envelope of the audio signal at the removed band, and inserting the shaped data signal into the removed band of the audio signal.