Hitachi, Ltd.

Fujitsu Corporation

Hitachi Maxell, Limited

Maxell, Ltd.

Hitachi Video Engineering, Incorporated

Atsushi Yoshioka

Hiroo Okamoto

Hitoaki Owashi

Nobuaki Kabuto

Kazuhiko Yoshizawa

Michio Masuda

Yoshizumi Watatani

Katsuyuki Watanabe

Akira Shibata

Manabu Sasamoto

Iwao Aizawa

Yoshimichi Kudo

Kuniaki Miura

Nobuo Azuma

Tadasu Otsubo

Shuichi Matsuo

Fumihiko Yamanushi

Masatoshi Takida

Shigeyuki Itoh

Yutaka Takami

Takashi Furuhata

Masami Murayama

Isao Nakagawa

Makoto Aikawa

Shuji Yoshimura

Shinichiro Fukushima

Kiyoharu Kishimoto

Shuzo Matsumoto

Tomomitsu Kuroyanagi

Yasufumi Yumde

Toshiro Aizawa

Susumu Ohtsuka

Yoichi Ito

Shigeaki Kawamata

Yasuo Ogasawara

Kazunori Kotani

Tetsuo Kawamata

Satoru Kuwata

Hitaoki Owashi

Isao Wada

Takao Aria

Katsuo Mouri

A digital information recording apparatus includes a recording circuit for recording information of a retention period included in the digital information and indicating a period for permitting the digital information to be held in the recording medium, starting with a time at which the digital information is recorded on the recording medium; and information of a playback permission period included in the digital information and indicating a period for permitting the digital information to be played back starting with a time at which the information is reproduced initially following recording of the digital information on the recording medium, permitting temporary recording or copying for the information permitted for 'copy never' or 'copy one generation.'

Digital information recording apparatus, reproducing apparatus and transmitting apparatus

Practical speaker connection is identified using a device having a sound channel of a 5.1 channel or 7.1 channel, and a device is provided that can easily reproduce the optimum multiple channels. Actual speaker arrangement can be identified by, for example, measuring the impedance of a terminal at the side of an audio amplifier. If incorrect connection is found, a warning is issued. This information is transmitted to a signal source with an EDID and a signal with the optimum a number of sound channel is sent. The EDID is also used for the connection with a display unit and the speaker connection with which the display unit is provided uniquely. For example, a sound through the 7.1 channel is easily reproduced using the speaker of the display unit in the channel of the front speaker.

Sound processing unit, sound processing system, audio output unit and display device

In a digital information recording/reproducing apparatus, information recorded on a hard disk with copy restriction thereof is protected from being copied onto other hard disks by means of a PC, etc., to be produced a large number of illegal copies, i.e., infringing a copyright. The information is recorded onto a hard disk drive through encryption thereof, with using an identification being number unique thereto, when it is recorded onto the hard disk. With this, normal reproduction is prevented, since the drive identification number necessary for decryption is different from, even if it is copied onto the other hard disk. Also, a version information of the hard disc is memorized in an information management circuit. When the information is illegally copied onto the other hard disc, the version information is changes; therefore it does not coincide with the version information memorized in the information management circuit. With this, illegal reproduction of the information copied can be prohibited in the reproducing operation.

Digital information recording apparatus and recording/reproducing apparatus

According to a video information outputting apparatus, a video information receiving apparatus, a video information outputting method and a video information transmitting method, for receiving and outputting digital video information. The digital information is outputted in the same quality as it is, when it is certificated that an external apparatus operates according to a copy control information, while no information limited on copying thereof is outputted when it is not. It thereby prevents the information, which is outputted from the video information outputting apparatus to an external apparatus, from being used in other purposes than the original object thereof, thereby giving disadvantages onto the producer and/or copyright owner of the information.

Video information outputting apparatus, video information receiving apparatus, video information outputting method and video information transmitting method

In transmission of stream data protected for copyright on a bus, transcription of stream data once recorded on a recording apparatus to a medium of another recording apparatus is realized. Authentication is carried out between a stream recording and playback apparatus and another recording apparatus to interchange a key for data scramble. By using this key, data is added with copy control information used when the data is recorded initially and thereafter the data is transmitted. After the data has been recorded on the recording apparatus, the data is deleted from an original recording medium. During transmission of the data, authentication from a different apparatus is rejected to prevent a plurality of copies from being made.

Recording and playback apparatus for stream data and transmission method for stream data

A digital information recording apparatus includes multiple recording circuits for making multiple copies. The apparatus limits the number of copies, however, in accordance with copy information provided within the digital information itself. When the number of copies is reached, if additional copies are to be made, then the source copy is disabled when a new copy is made.

Digital information recording apparatus and outputting apparatus

A video processing device includes a control circuit for detecting a physical quantity related to a size of noise contained in the input video signal, and an OSD (On Screen Display) circuit for providing a user with a warning screen when the physical quantity detected by the control circuit is larger than a prescribed value, obtaining an appropriate video signal even when a digital video signal has poor quality.

Video processing device

Growing community of inventors

Ebina, Japan

Atsushi Yoshioka