1
Iwagami Naoki, Moriya Takehiro, Jin Akio, Chikira Kazuaki, Mori Takeshi: Audio signal encoding method and decoding method, device therefor, and program recording medium. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, December 8, 2000: JP2000-338998 (17 worldwide citation)

PROBLEM TO BE SOLVED: To encode an input voice containing a tone component much in high area with high efficiency by dividing the frequency area coefficient of an input signal sample to generate a coefficient small piece group, classifying the coefficient small pieces to a plurality of groups follow ...


2
Moriya Takehiro, Iwagami Naoki, Jin Akio, Mori Takeshi, Chikira Kazuaki: Reversible coding method, reversible decoding method, system adopting the methods and each program recording medium. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, February 16, 2001: JP2001-044847 (10 worldwide citation)

PROBLEM TO BE SOLVED: To compress a digital input signal at a high compression rate and to completely reproduce the signal. SOLUTION: This reversible coding method includes a process, where a digital input signal is converted into a bit stream in a code absolute value expression for each frame, a pr ...


3
Iwakami Naoki, Moriya Takehiro, Jin Akio, Chikira Kazuaki, Mori Takeshi: Audio signal coding and decoding methods and apparatus and recording media with programs therefor. Nippon Telegraph & Telephone, October 25, 2000: EP1047047-A2 (5 worldwide citation)

An input signal is time-frequency transformed, then the frequency-domain coefficients are divided into coefficient segments of about 100 Hz width to generate a sequence of coefficient segments, and the sequence of coefficient segments is split into subbands each consisting of plural coefficient segm ...


4
Jin Akio, Moriya Takehiro, Iwagami Naoki, Mori Takeshi, Chikira Kazuaki: Method and device for encoding signal, recording medium recorded with signal encoding program. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, April 26, 2002: JP2002-123298 (5 worldwide citation)

PROBLEM TO BE SOLVED: To provide a method for masking hearing sensation highly accurately by precisely estimating the position of a mountain and a valley in a spectral envelope curved line when vocal and musical sound signals are encoded.SOLUTION: The device is provided with a T/F converter 11 which ...


5
Iwagami Naoki, Chikira Kazuaki: Method for encoding audio signal, decoding method, and program storage medium for executing the methods. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, March 12, 2002: JP2002-073093 (2 worldwide citation)

PROBLEM TO BE SOLVED: To provide a method for supporting the grasp of the outline of an audio signal when presenting an encoded audio signal and, particularly, presenting it through a transmission channel by efficiently performing operations such as quick listening, skipping listening.SOLUTION: Whil ...


6
Chikira Kazuaki, Iwagami Naoki: Musical sound coding method, musical sound decoding method and recording medium recorded with program to execute these methods. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, November 16, 2001: JP2001-318684 (2 worldwide citation)

PROBLEM TO BE SOLVED: To realize a coding and decoding method that eliminates the waste and easily edits and processes for the system in which acoustic information being transmitted is received, temporarily recorded in a recording medium, reproduced, edited, processed and speed varied resulting in a ...


7
Chikira Kazuaki, Moriya Takehiro, Jin Akio, Mori Takeshi: Method and device for detecting rise and fall of sound signal, program, and recording medium. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, September 20, 2002: JP2002-268657 (1 worldwide citation)

PROBLEM TO BE SOLVED: To accurately detect a sound signal rising and falling with a small operation quantity and a small processing quantity.SOLUTION: An inputted sound signal is divided into analytic frames, which are each subdivided into sections; and the energy of the sound signal in each section ...


8
Mori Hideo, Chikira Kazuaki: Network monitoring device, network monitoring method, and network monitoring program. Nippon Telegraph & Telephone, June 9, 2010: EP2194677-A1

A traffic monitoring system (10) monitors traffics flowing through a network (100); when an abnormal traffic is detected, identifies an attack source network, a source of an attack, on the basis of attack source information indicating a source device from which the abnormal traffic is transmitted, w ...


9
Chikira Kazuaki, Mori Hideo: Abnormal traffic detection device, abnormal traffic detection method, and abnormal traffic detection program. Nippon Telegraph & Telephone, May 19, 2010: EP2187577-A1

An abnormal traffic detection apparatus for detecting an abnormal traffic toward a communication apparatus by using information on traffics passing through a switch, comprising destination IP address counting units (C1 to C4) configured to store amount information on amount of traffics as an amount ...


10
Mori Hideo, Chikira Kazuaki: Network monitoring device, network monitoring method, and network monitoring program. Nippon Telegraph And Telephone Corporation, Mori Hideo, Chikira Kazuaki, SAKAI Hiroaki, April 2, 2009: WO/2009/041686

A traffic monitoring system (10) monitors a traffic flowing in a local network (100). If an abnormal traffic is detected, the traffic monitoring system (10) identifies an attack source network according to attack source information indicating a transmission source device of the abnormal traffic obta ...