Hitachi, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Fipa Frohwitter Intellectual Property Ag

Keizo Nishimura

Hitoaki Owashi

Hideo Arai

Akira Shibata

Yoshizumi Watatani

Kyoichi Hosokawa

Takao Arai

Takaharu Noguchi

Hiroo Okamoto

Hideo Nishijima

Nobutaka Amada

Hiroaki Ono

Nobuyuki Kaku

Kiyoshi Kano

Shinya Fujimori

Masaharu Kobayashi

Hiroyuki Kimura

Shigemitsu Higuchi

Takashi Hoshino

Yasunori Kanazawa

Toshifumi Shibuya

Masami Nishida

Yasuyuki Inoue

Hiromichi Tanaka

Masuo Oku

Masaru Takahashi

Takashi Furuhata

Takashi Takeuchi

Kouji Fujita

Yukio Fujii

Kouji Kaniwa

Atsuo Suga

Kenji Ichige

Shin-ichi Ohashi

Tomohide Sorihashi

Fujio Okamura

Fuzio Okamura

Kazumasa Oiso

A digital information receiving apparatus and method in which a receiver receives a digital signal including a video signal and an audio signal, wherein the received video signal is bit-compressed by a first compression method and the received audio signal is bit-expanded by a second compression method which is different from the first compression method, a demodulator demodulates the received digital signal, and an expander bit-expands the demodulated digital signal.

Apparatus and method for receiving and recording digital information

A method for digital information including at least one of digital video information and digital audio information to a transmission path. The method includes compressing the digital video information by a first compression method, bit compressing the digital audio information by a second compression method which is different from the first compression method, and adding error-detection information to both the digital video information and the digital audio information.

Method for transmitting digital audio and video information

A method and apparatus for transmitting and receiving digital information including video information and audio information. The video information is compressed by a first compression method and the audio information is compressed by a different second compression method for transmission on a transmission path.

Method and apparatus for transmitting and receiving digital video and audio information

An information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus has a main information reproducing system for reproducing main information recorded in a given recording medium; and a reproduction management system for managing the main information reproducing system for reproducing the main information. A receiver is provided with a unit for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing system provided with a reproduction disabling function for limiting the reproduction of main information.

Information management apparatus

An apparatus for receiving digital information including a receiver which receives the digital information that has digital video information bit-compressed by a first compression system, digital audio information bit-compressed by a second compression system, and error-detection information added to both the digital video information and the digital audio information. There is also provided a demodulator which demodulates the digital information received by the receiver, an error detector which detects an error of digital information demodulated by the demodulator by use of the error-detection information, a first expander which bit-expands video information among the digital information error detected by the error detector corresponding system, and a second expander which bit-expands audio information among the digital information error detected by the error detector corresponding to the second compression system.

Apparatus for receiving compressed digital information

A transmitting apparatus and method for transmitting a digital signal in which a time-base compressor compresses the digital signal, a bit compressor compresses the time-base compressed signal from the time-base so that a transmission rate of the time-base compressed signal from the time-base compressor is higher than a transmission rate of the bit-compressed signal from the bit-compressor, and a transmitter transmits the bit compressed signal.

Digital information recording/reproducing apparatus

An apparatus and method for transmitting and receiving digital information includes a transmitting part for transmitting digital video information and digital audio information and receiving part for receiving digital video information and digital audio information. The transmitting part includes a first compressor for digital video information, a second compressor for digital audio information, a parity signal adder, a modulator, and a transmitter. The receiving part includes a receiver which receives digital information which is digital video information bit-compressed by a first compression system plus digital audio information bit-compressed by a second compression system, and to which has been added a parity signal for error detecting, phase-modulated and transmitted to a transmission path; a demodulator; an error detector, a first expander which bit-expands video information, and a second expander which bit-expands audio information.

Digital information recording/reproducing method and apparatus

An apparatus for at least receiving digital information including digital video information bit-compressed by a first compression system plus digital audio information bit-compressed by a second compression system and transmitted to a transmission path. The receiver apparatus includes a receiver which receives the transmitted digital information, a demodulator which demodulates the digital information received by the receiver, an error detector which detects an error of a digital information demodulated by the demodulator by use of a parity signal, a first expander which bit-expands video information among digital information error detected by the error detector corresponding to the first compression system and a second expander which bit-expands audio information among digital information error detected by the error detector corresponding to the second compression system.

A digital signal recording/reproducing apparatus having a mode for recording a compressed input signal on a recording medium and a mode for recording a non-compressed input signal on the recording medium. The apparatus include input circuits which input a digital compressed signal and an analog non-compressed signal, an A/D converter, a data compressor, a mode change-over circuit which changes-over the mode, and a selector which selects either a digital compressed signal from the data compressor or a digital compressed signal from the input circuit. A recorder records a recording signal to a recording medium and a reproducer.

The present invention relates to an information providing system. More particularly, this invention relates to an information management apparatus capable of reliable management of distributed information and an information providing system employing the same information management apparatus. The information management apparatus comprises a main information reproducing means for reproducing main information recorded in a given recording medium; and a reproduction management means for managing the main information reproducing means for reproducing the main information. The present invention provides a receiving means provided with a means for recording distributed information and control information limiting the number of main information reproducing cycles on a recording medium, and a main information reproducing means provided with a reproduction disabling means for limiting the reproduction of main information.

Apparatus and method for transmitting and receiving digital information

A digital information transmitting, receiving and/or recording/reproducing system, provided with the digital information transmitting apparatus for transmitting the digital information to a transmission path, a receiving apparatus for receiving the transmitted digital information and a recording/reproducing apparatus for the recording received digital information to a recording media and reproducing therefrom. The apparatus includes a compressor which compresses the digital information, a transmission parity signal adder which adds a transmission parity signal to the output signal of the compressor in order to correct an error occurring in the transmission path, wherein the transmission parity signal is different from a record parity signal to be added at the recording apparatus and a transmitter which transmits the transmission parity signal added compressed digital information added by the transmission parity signal adder to the transmission path.

Digital transmission signal processing system and recording/reproducing system

Apparatus and method for limiting the reproduction of main information

A digital information transmitting apparatus includes a first bit-compressor for bit-compressing a digital video information by a system of discrete cosine transform and a second bit-compressor for bit-compressing a digital audio information by a different system from the system of the first bit-compressor. A parity signal adder is provided for adding a parity signal to the bit-compressed digital video information from the first bit-compressor and the bit-compressed digital audio information from the second bit-compressor, in order to correct an error which occurs in a transmission path. A modulator is provided for phase-modulating the bit-compressed digital video information and the bit-compressed audio information, to which the parity signal has been added by the parity signal adder, and a transmitter ig provided for transmitting the modulated and parity signal added bit-compressed digital video information and bit-compressed digital audio information from the modulator, to the transmission path.

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Yokosuka, Japan

Keizo Nishimura