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Method for the compression of recordings of ambient noise, method for the detection of program elements therein, and device thereof

  • US 6,993,479 B1
  • Filed: 06/23/1998
  • Issued: 01/31/2006
  • Est. Priority Date: 06/23/1997
  • Status: Expired due to Term
First Claim
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1. A method for storing an electric signal representing recorded ambient noise in compressed form, the method comprising:

  • periodically recording samples of the ambient noise using a sound transducer, the sample duration being shorter than the sampling cycle;

    dividing the recorded audio signal into at least two band signals by filtering, with each one of the band signals containing a frequency range of the audio signal, and wherein any content of the other band signals contained in each band signal is present only in an attenuated form;

    normalizing the amplitude of the divided audio signal within a first predetermined range D;

    mapping the normalized amplitude values of the sampled ambient noise onto a second predetermined range of values in the time domain using a non-linear mapping function to obtain an emphasis of selected values ranges within the first or the second predetermined ranges; and

    storing the mapped result in an electronic memory in a digital format.

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