Abstract: A system and method is provided for easily detecting a fraudulent user who attempts to obtain authentication using voice reproduced by a reproducer. A personal computer is provided with an audio data obtaining portion for picking up ambient sound around a person as a target of user authentication using voice authentication technology during a period before the person utters, and a fraud determination portion for calculating an intensity level showing intensity of the picked-up ambient sound per predetermined time for each of sections into which the period is divided and for determining that the person is a fraudulent user who attempts to obtain authentication using reproduced voice, when, of two of the calculated intensity levels, the intensity level of the later section is larger than a sum of the intensity level of the earlier section and a predetermined value.

Abstract: A system and method is provided for easily detecting a fraudulent user who attempts to obtain authentication using voice reproduced by a reproducer. A personal computer is provided with an audio data obtaining portion for picking up ambient sound around a person as a target of user authentication using voice authentication technology during a period before the person utters, and a fraud determination portion for calculating an intensity level showing intensity of the picked-up ambient sound per predetermined time for each of sections into which the period is divided and for determining that the person is a fraudulent user who attempts to obtain authentication using reproduced voice, when, of two of the calculated intensity levels, the intensity level of the later section is larger than a sum of the intensity level of the earlier section and a predetermined value.

Abstract: In a voice data processing method and device detecting a pitch from history data during a packet loss and generating compensating data thereof, input signal data is decoded in a normal mode, a calculation of a normalized cross-correlation in coarse search used for a pitch detection is repeated by a predetermined frequency of loops within a required frequency of loops, based on history decode data, a peak value of a normalized cross-correlation obtained by the calculation and a delay data value corresponding thereto are held, and fine search is executed by repeating the calculation of the normalized cross-correlation in the coarse search by a remaining required frequency of loops, by using the peak value of the normalized cross-correlation and the delay data value in a packet loss mode, thereby generating compensating data.

Abstract: A method for producing allyl chloride by oxychlorination of propylene, which comprises reacting propylene, hydrogen chloride and oxygen in the presence of a catalyst comprising an alloy of tellurium supported on a carrier.