Composite signal producing method for producer, involves encoding sound signal into encoded sound signal, by frequency shifting former signal towards high inaudible frequencies, so that encoded signal is diffusible in inaudible manner

摘要

The method involves encoding a sound signal (5) into an encoded sound signal (5e), so that the signal (5e) is diffusible by a sound diffusion unit (8) in a manner inaudible to a human ear (7). The signal (5) is encoded by making a frequency shift of the signal (5) towards high inaudible frequencies of diffusion spectrum of the unit (8). A sound signal (4) audible to the ear and the sound signal (5e) are agglomerated into a composite sound signal (6) that is diffusible by the unit (8) such that the signal (4) is audible to the human ear and the signal (5) is inaudible to the human ear. Independent claims are also included for the following: (1) a composite signal obtained by a composite signal producing method (2) a medium for storage of a composite signal (3) a producer for producing a composite signal (4) a method for sound diffusion of a sound signal and wireless transmission of another sound signal (5) a transmitter comprising a sound diffusion unit to diffuse a composite signal (6) a method for receiving a composite sound signal (7) a receiver comprising a composite signal reception unit (8) a system for sound diffusion of sound signals and comprising a producer, a transmitter and a receiver.