METHOD OF EMBEDDING DIGITAL INFORMATION INTO AUDIO SIGNAL, MACHINE-READABLE STORAGE MEDIUM AND COMMUNICATION TERMINAL

摘要

PURPOSE: A digital information embedding method, a storage medium thereof, and a communication terminal thereof are provided to increase a reception sensitivity distance by dividing digital information and an original audio signal. CONSTITUTION: A bandpass filter(607) passes a low frequency band or a high frequency band from an original audio signal. A delay line(609) has a length corresponding to a group delay of the bandpass filter. The delay line delays the original audio signal to output the delayed signal. A first subtracter(621) subtracts a first signal part from the original audio signal. The first signal part is modulated by using a frequency-selection echo modulation method. The first subtracter outputs a second signal part. [Reference numerals] (601,614) Noise-robustness encoding block; (602,615) Interleaver; (604) Controller; (605) Filter 1; (606) Filter 2; (607) Filter; (608) Filter N; (609) Delay line; (612) Multi-carrier signal embedding block; (613) Psychoacoustic analysis and spectrum shaping block; (AA) Anterior data; (BB) Current symbol; (CC) Next symbol; (DD) Audio signal embedded with digital information; (EE) Posterior data