Patents by Inventor Keiko Tada
Keiko Tada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9019983Abstract: In a communications system which complies with LTE including a base station 2 which transmits data by using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method, and a mobile terminal 3, in a case in which an uplink scheduling request signal SR is transmitted by using an S-RACH when an Ack/Nack signal is being transmitted by using an Ack/Nack exclusive channel, the transmission of the Ack/Nack signal is stopped while the uplink scheduling request signal SR is transmitted.Type: GrantFiled: December 27, 2006Date of Patent: April 28, 2015Assignee: Mitsubishi Electric CorporationInventors: Miho Maeda, Mitsuru Mochizuki, Keiko Tada, Yasushi Iwane
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Patent number: 8325919Abstract: The present invention is directed to a streaming system for encrypting compression-encoded image data to distribute it via network of a predetermined transport protocol, and a streaming server used in this system transmits, to a client terminal, on the RTP packet basis, stream data encrypted so that encryption is performed every encryption block size from the leading portion of each GOP without encrypting the last data having less than encryption block size. In this instance, portions of prior and/or posterior stream data are stored into an extended area of RTP header so that size of stream data transmitted every RTP packet is integral multiple of encryption block size. Further, size information of added prior additional data and/or posterior additional data are also stored into the extended area. This streaming server suppresses increase in size by encryption to have ability to support both real time production and down-load reproduction without replacement of encryption.Type: GrantFiled: April 24, 2008Date of Patent: December 4, 2012Assignee: Sony CorporationInventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Patent number: 8325918Abstract: The present invention is directed to a streaming system for encrypting compression-encoded image data to distribute it via network of a predetermined transport protocol, and a streaming server used in this system transmits, to a client terminal, on the RTP packet basis, stream data encrypted so that encryption is performed every encryption block size from the leading portion of each GOP without encrypting the last data having less than encryption block size. In this instance, portions of prior and/or posterior stream data are stored into an extended area of RTP header so that size of stream data transmitted every RTP packet is integral multiple of encryption block size. Further, size information of added prior additional data and/or posterior additional data are also stored into the extended area. This streaming server suppresses increase in size by encryption to have ability to support both real time production and down-load reproduction without replacement of encryption.Type: GrantFiled: January 28, 2003Date of Patent: December 4, 2012Assignee: Sony CorporationInventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Publication number: 20120170485Abstract: A mobile terminal 3 judges whether or not the mobile terminal is able to make a transition to a DTX period during Active, and, when judging that the mobile terminal is able to make a transition to a DTX period during Active, notifies a base station 2 to that effect. If the base station 2 judges that the mobile terminal is able to make a transition to a DRX period during Active when triggered by the notification from the mobile terminal 3, the base station temporarily stops supply of electric power to the data transmission processing units and the data reception processing units of the mobile terminal 3.Type: ApplicationFiled: March 14, 2012Publication date: July 5, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Miho MAEDA, Mitsuru Mochizuki, Yasushi Iwane, Tetsuya Mishuku, Masaaki Kusano, Ryoichi Fujie, Shigenori Tani, Keiko Tada, Noriyuki Fukui, Michiaki Takano
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Patent number: 8149749Abstract: A mobile terminal judges whether or not the mobile terminal is able to make a transition to a DTX period during Active, and, when judging that the mobile terminal is able to make a transition to a DTX period during Active, notifies a base station to that effect. If the base station judges that the mobile terminal is able to make a transition to a DRX period during Active when triggered by the notification from the mobile terminal, the base station temporarily stops supply of electric power to the data transmission processing units and the data reception processing units of the mobile terminal.Type: GrantFiled: April 27, 2007Date of Patent: April 3, 2012Assignee: Mitsubishi Electric CorporationInventors: Miho Maeda, Mitsuru Mochizuki, Yasushi Iwane, Tetsuya Mishuku, Masaaki Kusano, Ryoichi Fujie, Shigenori Tani, Keiko Tada, Noriyuki Fukui, Michiaki Takano
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Publication number: 20100178895Abstract: A mobile communications system including a mobile terminal 1 and a base station 2 which relays communications between a network and the mobile terminal 1, in which the base station 2 can deliver information to the mobile terminal 1 by using an MBMS, in which the base station 2 sets a flag indicating presence or absence of emergency information to a control channel used for the MBMS, and notifies the presence or absence of the emergency information to the mobile terminal 1 by using the description of the flag set to the control channel for the MBMS.Type: ApplicationFiled: July 4, 2008Publication date: July 15, 2010Applicant: Mitsubishi Electric CorporationInventors: Miho Maeda, Keiko Tada, Yoshinori Takahashi, Hideyuki Nakamizo, Kazunori Takahashi, Tatsuya Itoh, Mitsuru Mochizuki
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Publication number: 20100046451Abstract: In accordance with the present invention, in a case of using persistent scheduling, when detecting a transition from a talk state to a silent state, resources to be allocated during a silent state are allocated to a channel exclusive for silent period, and the resources which have been allocated to a mobile terminal during the talk spurt are released. Therefore, the useless allocation of resources can be reduced, and the throughput of the system can be improved.Type: ApplicationFiled: February 1, 2008Publication date: February 25, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Keiko Tada, Mitsuru Mochizuki, Miho Maeda, Yasushi Iwane
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Publication number: 20090316811Abstract: In a communications system which complies with LTE including a base station 2 which transmits data by using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method, and a mobile terminal 3, in a case in which an uplink scheduling request signal SR is transmitted by using an S-RACH when an Ack/Nack signal is being transmitted by using an Ack/Nack exclusive channel, the transmission of the Ack/Nack signal is stopped while the uplink scheduling request signal SR is transmitted.Type: ApplicationFiled: December 27, 2006Publication date: December 24, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Miho Maeda, Mitsuru Mochizuki, Keiko Tada, Yasushi Iwane
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Publication number: 20090180414Abstract: A mobile terminal judges whether or not the mobile terminal is able to make a transition to a DTX period during Active, and, when judging that the mobile terminal is able to make a transition to a DTX period during Active, notifies a base station to that effect. If the base station judges that the mobile terminal is able to make a transition to a DRX period during Active when triggered by the notification from the mobile terminal, the base station temporarily stops supply of electric power to the data transmission processing units and the data reception processing units of the mobile terminal.Type: ApplicationFiled: April 27, 2007Publication date: July 16, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Miho Maeda, Mitsuru Mochizuki, Yasushi Iwane, Tetsuya Mishuku, Masaaki Kusano, Ryoichi Fujie, Shigenori Tani, Keiko Tada, Noriyuki Fukui, Michiaki Takano
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Publication number: 20090010430Abstract: The present invention is directed to a streaming system for encrypting compression-encoded image data to distribute it via network of a predetermined transport protocol, and a streaming server used in this system transmits, to a client terminal, on the RTP packet basis, stream data encrypted so that encryption is performed every encryption block size from the leading portion of each GOP without encrypting the last data having less than encryption block size. In this instance, portions of prior and/or posterior stream data are stored into an extended area of RTP header so that size of stream data transmitted every RTP packet is integral multiple of encryption block size. Further, size information of added prior additional data and/or posterior additional data are also stored into the extended area. This streaming server suppresses increase in size by encryption to have ability to support both real time production and down-load reproduction without replacement of encryption.Type: ApplicationFiled: April 24, 2008Publication date: January 8, 2009Inventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Patent number: 7337320Abstract: The present invention is directed to a streaming system for encrypting encrypted data such as music and image, etc. to perform stream distribution thereof. Client terminals (30) used in this system structure leaves of the hierarchical tree structure, and hold a key set consisting of a route key, node keys and the own leaf key on a path of this tree structure, whereby SDP file is transmitted from a stream server (20). In the SDP file, there is stored encrypted information consisting of EKB including data encrypted by selection key that only specific client terminal holds and encrypted contents key data in which contents key has been encrypted. Only specific client terminal having selection key in key set (selected client terminal) decodes contents key from selection key to decode encrypted contents data caused to undergo stream distribution into contents data to perform real time reproduction thereof.Type: GrantFiled: January 28, 2003Date of Patent: February 26, 2008Assignee: Sony CorporationInventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Patent number: 7325139Abstract: The present invention relates to an information processing apparatus and method and to a program for reliably preventing unauthorized use of content even in the case of a low-throughput content storage device. A CPU selects content to be stored on a content storage device. In step S202, the CPU verifies a first digital signature added to the content. A storage unit stores a usage right. In step S203, the CPU searches the storage unit for the usage right. In step S207, the CPU verifies a second digital signature added to the usage right. The CPU generates alteration detecting data on the basis of information included in the usage right. In step S208, when the content and the usage right are unaltered, the CPU outputs the usage right, the alteration detecting data, and the content to the content storage device. The present invention is applicable to clients in a DRM system.Type: GrantFiled: April 10, 2003Date of Patent: January 29, 2008Assignee: Sony CorporationInventors: Ryuji Ishiguro, Keiko Tada, Motomasa Futagami
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Publication number: 20040243808Abstract: The present invention relates to an information processing apparatus and method and to a program for reliably preventing unauthorized use of content even in the case of a low-throughput content storage device. A CPU selects content to be stored on a content storage device. In step S202, the CPU verifies a first digital signature added to the content. A storage unit stores a usage right. In step S203, the CPU searches the storage unit for the usage right. In step S207, the CPU verifies a second digital signature added to the usage right. The CPU generates alteration detecting data on the basis of information included in the usage right. In step S208, when the content and the usage right are unaltered, the CPU outputs the usage right, the alteration detecting data, and the content to the content storage device. The present invention is applicable to clients in a DRM system.Type: ApplicationFiled: December 12, 2003Publication date: December 2, 2004Inventors: Ryuji Ishiguro, Keiko Tada, Motomasa Futagami
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Publication number: 20040177267Abstract: The present invention is directed to a streaming system for encrypting compression-encoded image data to distribute it via network of a predetermined transport protocol, and a streaming server used in this system transmits, to a client terminal, on the RTP packet basis, stream data encrypted so that encryption is performed every encryption block size from the leading portion of each GOP without encrypting the last data having less than encryption block size. In this instance, portions of prior and/or posterior stream data are stored into an extended area of RTP header so that size of stream data transmitted every RTP packet is integral multiple of encryption block size. Further, size information of added prior additional data and/or posterior additional data are also stored into the extended area. This streaming server suppresses increase in size by encryption to have ability to support both real time production and down-load reproduction without replacement of encryption.Type: ApplicationFiled: April 22, 2004Publication date: September 9, 2004Inventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Publication number: 20040156508Abstract: The present invention is directed to a streaming system for encrypting encrypted data such as music and image, etc. to perform stream distribution thereof. Client terminals (30) used in this system structure leaves of the hierarchical tree structure, and hold a key set consisting of a route key, node keys and the own leaf key on a path of this tree structure, whereby SDP file is transmitted from a stream server (20). In the SDP file, there is stored encrypted information consisting of EKB including data encrypted by selection key that only specific client terminal holds and encrypted contents key data in which contents key has been encrypted. Only specific client terminal having selection key in key set (selected client terminal) decodes contents key from selection key to decode encrypted contents data caused to undergo stream distribution into contents data to perform real time reproduction thereof.Type: ApplicationFiled: March 29, 2004Publication date: August 12, 2004Inventors: Keiko Tada, Ryuji Ishiguro, Motomasa Futagami
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Patent number: 6754548Abstract: According to this invention, when the header is detected from the digital music contents that has been stored in the flash memory and has the header composed of the reproducible period of time, the number of reproducible times and the number of reproduced times, and the music data, if reproducing instruction is given, the number of reproduced times is incremented and updated according to the above instruction, and at the same time, when the number of reproduced times is within the range of the number of reproducible times, the music data is reproduced according to the reproducing instruction. Thereby, its reproducing processing without limitation over the reproducible period of time can be surely prevented.Type: GrantFiled: August 29, 2000Date of Patent: June 22, 2004Assignee: Sony CorporationInventors: Fumihiko Yoshii, Keiko Tada