Abstract: The present invention provides a method of reversible audio data hiding. The method of data hiding and restoring comprises the steps of: protecting audio by embedding information into the audio according to variance calculation associated to the audio, wherein the quality of the protected audio is degraded after embedding the information into the audio; publishing the protected audio widely as a trial for listen version; and decoding the protected audio for a user who purchased the copyright of the audio by extracting the original audio from the protected audio.

Abstract: The present invention provides a method of reversible audio data hiding. The method of data hiding and restoring comprises the steps of: protecting audio by embedding information into the audio according to variance calculation associated to the audio, wherein the quality of the protected audio is degraded after embedding the information into the audio; publishing the protected audio widely as a trial for listen version; and decoding the protected audio for a user who purchased the copyright of the audio by extracting the original audio from the protected audio.

Abstract: A circuit board, for an electronic circuit having a passive circuit component, has a component region, non-component region, and circuit wiring conductors on its surface. The component region includes a polymer composition comprising a mixture of polymer resin and filler material that, in combination with the circuit wiring conductors, forms the passive circuit component.

Abstract: A magnetic core is made of a composite magnetic material having a relative permeability of between 1 and 29 at a frequency range from 20 kHz to 2.5 MHz. The composite magnetic material consists of cobalt and nickel particles having an average diameter in the range of 1 to 100 micrometers, and a polymer base binding the particles to form a core.