| US 7,587,311 B2 | ||
| Device and method for embedding binary payload in a carrier signal | ||
| Gerald Schuller, Erfurt (Germany); Ralf Geiger, Ilmenau (Germany); and Juergen Koller, Munich (Germany) | ||
| Assigned to Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., (Germany) | ||
| Filed on Nov. 15, 2005, as Appl. No. 11/274,836. | ||
| Application 11/274836 is a continuation of application No. PCT/EP2004/004481, filed on Apr. 28, 2004. | ||
| Claims priority of application No. 103 21 983 (DE), filed on May 15, 2003. | ||
| Prior Publication US 2006/0095253 A1, May 04, 2006 | ||
| Int. Cl. G10L 19/00 (2006.01) | ||
| U.S. Cl. 704—200.1 | 30 Claims |
| 1. A device for embedding binary payload into a carrier signal comprising a first sequence of discrete values, the device
comprising:
a first converter for converting the first sequence of discrete values to a spectral representation using a forward integer
transform algorithm configured to provide a set of integer binary spectral representation values representing frequencies
in an ascending order, wherein spectral representation values to be modified comprise bits, and wherein a different valency
is associated with each bit of a spectral representation value to be modified, wherein a set bit with a highest valency in
the bits of the spectral representation value is a leading bit of the spectral representation value, and wherein all remaining
bits of the spectral representation value have a lower valency than the leading bit;
a determiner for determining signal limit valencies for the spectral representation values, wherein the signal limit valencies
are at least one valency level below a valency of the respective leading bit of the spectral representation values;
a setter for setting bits of the spectral representation values whose valencies are equal to the signal limit valency or less
than the signal limit valency according to the binary payload to obtain modified spectral representation values, wherein bits
whose valencies are greater than the signal limit valencies are not available for payload embedding; and
a second converter for converting a set of integer binary spectral representation values, in which the modified spectral representation
values are contained instead of the spectral representation values to be modified, to a second sequence of discrete values
using a backward integer transform algorithm so that the payload is embedded in the second sequence of values.
|