Method of embedding digital information into audio signal machine-readable storage medium and communication terminal
A method for embedding digital information into an audio signal, is provided. The method includes dividing the digital information into low-priority data and high-priority data; dividing the audio signal into first and second signal parts; embedding at least one echo signal into the first signal part; embedding a communication signal modulated with low-priority data, which has a spectrum according to psychoacoustic analysis of the second signal part, into the second signal part; and combining the embedded first and second signal parts.
1. A method for embedding digital information into an audio signal, the method comprising:
dividing the digital information into low-priority data and high-priority data;
dividing the audio signal into first and second signal parts;
embedding at least one echo signal into the first signal part;
embedding a communication signal modulated with low-priority data, which has a spectrum according to psychoacoustic analysis of the second signal part, into the second signal part; and
combining the embedded first and second signal parts.
2. The method for embedding digital information into an audio signal according to claim 1 , wherein the modulated communication signal is a multicarrier modulated signal.
3. The method for embedding digital information into an audio signal according to claim 1 , wherein the first signal part into which the echo signal is embedded belongs to a frequency band lower than the second signal part.
4. The method for embedding digital information into an audio signal according to claim 1 , wherein the first signal part into which the echo signal is embedded belongs to a frequency band higher than the second signal part.
5. The method for embedding digital information into an audio signal according to claim 1 , wherein the combined first and second signal parts are output through a speaker.
6. A machine-readable storage device containing a program for executing a method for embedding digital information into an audio signal, the method comprising:
dividing the digital information into low-priority data and high-priority data;
dividing the audio signal into first and second signal parts;
embedding at least one echo signal into the first signal part;
embedding a communication signal modulated with low-priority data, which has a spectrum according to psychoacoustic analysis of the second signal part, into the second signal part; and
combining the embedded first and second signal parts.
7. A communication terminal for embedding digital information into an audio signal, the communication terminal comprising:
a memory for storing the digital information and the audio signal;
a controller configured to divide the digital information into low-priority data and high-priority data, divide the audio signal into first and second signal parts, embed at least one echo signal into the first signal part, embed a communication signal modulated with low-priority data, which has a spectrum according to psychoacoustic analysis of the second signal part, into the second signal part, and combine the embedded first and second signal parts; and
a speaker for outputting the combined first and second signal parts.
8. The communication terminal according to claim 7 , wherein the modulated communication signal is a multicarrier modulated signal.
9. The communication terminal according to claim 7 , wherein the first signal part into which the echo signal is embedded belongs to a frequency band lower than the second signal part.
10. The communication terminal according to claim 7 , wherein the first signal part into which the echo signal is embedded belongs to a frequency band higher than the second signal part.