Sony Corporation

Nippon Telegraph and Telephone Corporation

Masakatsu Toyoshima

Akira Sakamoto

Takeshi Fukami

Shigeru Sugaya

Keiji Fukuzawa

Michimasa Komatsubara

Yasuhiro Hideshima

Toshiro Terauchi

Takehiro Sugita

Yoshiyuki Kondo

Ichiro Kubota

Atsushi Matsuzaki

Katsumi Oishi

Noboru Someno

Toshihiko Waku

Isao Takeuchi

Kenji Inose

Koichi Tagawa

Taku Yamagata

Ikuo Shimizu

Etsumi Fujita

Katsumi Ohishi

Hisayoshi Sugiyama

Kohichi Suto

This invention relates to an information delivery system and method, an information transmission apparatus and method, and an information receiving apparatus and method for delivering a digital multi-channel service signal through a satellite and a cable network. A QPSK demodulation circuit demodulates an inputted TS and outputs it to an error correction circuit. The error correction circuit corrects the inputted signal and outputs it to a network information (NIT) conversion circuit. The NIT conversion circuit replaces the NIT for CS waves with NIT for cable TV and outputs it to a QAM demodulation circuit. The QAM demodulation circuit demodulates the inputted signal and pouts it to a frequency conversion circuit. The frequency conversion circuit converts the frequency of the inputted signal into a predetermined value and outputs the signal to a signal mixer.

Information distribution system

A communication system that permits the coexistent of a plurality of ultrawide band (UWB) radio communication networks that use different signal systems is achieved by using the same beacon signal and specifying the format of part of the control command among a plurality of UWB radio communication networks that use different signal systems, as defined, for example, by impulse period, impulse width, spreading ratio, and spreading code. When one UWB network receives a beacon signal from another UWB network, it grasps, judging from the received beacon signal, the transmission parameter that is used by another party and performs time-division on the transmission frame period for its own system.

Radio communication system, and apparatus, method, and computer program for said radio communication system

A communication system that permits the coexistence of a plurality of ultrawide band (UWB) radio communication networks that use different signal systems is achieved by using the same beacon signal and specifying the format of part of the control command among a plurality of UWB radio communication networks that use different signal systems, as defined, for example, by impulse period, impulse width, spreading ratio, and spreading code. When one UWB network receives a beacon signal from another UWB network, judging from the received beacon signal it grasps the transmission parameter that is used by another party and performs time-division on the transmission frame period for its own system.

The MPEG2TS packet S as the digital broadcast data is obtained from the ECC decoder. The NIT detecting circuit detects NIT from this packet S , changes the transmitting frequency information and deletes the information (service information) of the program to be limited for viewing, thereby to obtain the table NITb. The NIT replacing circuit detects NIT from the packet S and replaces it to the table NITb, thereby to obtain the MPEG2TS packet S as the digital broadcast data in CATV. The digital broadcast signal BS for CATV can be obtained by executing the error correction code adding process, modulating process and frequency-converting process to the packet S . The receiving apparatus for receiving the predetermined program on the basis of the program information of NIT can no longer receive the program in relation to the program information deleted by NIT.

Signal processing apparatus and signal receiving apparatus

An information processing apparatus in which an eye center measuring unit determines a code judgment point from a peak timing signal supplied from a timing signal generation circuit and an amplitude signal supplied from an interpolator and detected by an amplitude detector, and outputs it to a multiplier via an amplifier, a subtracter, and a reciprocal generating unit. A zero cross point measuring unit determines a code change point from a zero cross timing signal supplied from a timing signal generation circuit and an amplitude signal supplied from the interpolator and detected by the amplitude detector, and outputs it to the multiplier via a subtracter. The multiplier multiplies the supplied signals, and a dB converter converts a supplied signal into a signal in decibels and outputs the signal to a display circuit.

Information processing apparatus and method

An information transmitting system capable of two way communication, suitable for use in transmitting information signals between a central control unit and a plurality of terminal apparatus units. Each terminal apparatus unit may be located at a different passenger seat in an aircraft, a train, a bus, or the like. The signals transmitted from each terminal apparatus to the central control unit are transmitted by way of two channels. In one operating mode, one channel is used as a random access channel, and the other is used as a polling channel. When polling transmission is not effected, the polling channel is used as a second random access channel, so that the system may efficiently transmit many information signals on two random access channels.

Two way communication system

A service and entertainment system for transmitting video signals, audio signals and television game software signals from a central transmitting apparatus to each of a plurality of terminal units mounted at respective passenger seats in a passenger vehicle such as aircraft or the like, or at respective seats in a stadium, a theater, or the like. The video signals, audio signals and television game software signals are frequency-multiplexed and then transmitted to the terminal units, so that desired ones of the frequency-multiplexed signals can be selected at each terminal unit.

Passenger service and entertainment system for supplying

A digital signal transmitting system includes a plurality of digital signal reproducers, each outputting a digital data signal to be time-division multiplexed; a digital signal multiplexer supplied with a frame synchronizing signal, a service bit signal and the output digital signals from the reproducers and for producing a block data signal including the frame synchronizing signal, the service bit signal and a plurality of slot data bits arranged with the digital data signals, each one bit within a multiple-frame, in which the service bit signal is indicative of the transmission mode and the slot data associated with each of the plurality of digital data signals being transmitted.

Digital signal transmitting system

Digital signals of up to four different modes are produced for transmission over an unused television channel in an existing cable television transmission line. No more bandwidth is required than that normally required by a single existing television channel. The various modes of digital signals all include synchronizing signals and service bit signals which are used to address any of the numerous terminals at the receiving side to control access to the various modes of digital signals transmitted over the single channel. By controlling the transmission of the modes to have constant time intervals, which can be selected based upon different sampling times, high quality audio signals may be transmitted or/and data channels or monaural audio signals, all of which may be transmitted over the single cable television transmission line.

Digital terminal address transmitting for CATV

A scrambling system for an audio frequency signal is disclosed which employs a timebase-compressing and/or expanding system to measure the compressed and/or expanded amount of a segment time length caused in a transmission recording and reproducing system. In the scrambling system of the present invention, a marker signal is inserted into a portion between the adjoining segments and transmitted from an encoder side to a decoder side, while at the decoder side, this marker signal is detected, the synchronization is achieved by this marker signal along the compression and expansion of the segment length and the respective segments are rearranged to the original correct order. Thus, the connected portion between the segments can be made smooth so that it is possible to obtain the scrambling system for an audio frequency signal having high accuracy and high reliability.

Scrambling system for an audio frequency signal

A bidirectional digital signal communication system includes a plurality of terminal units in communication with a center unit. Each of the terminal units includes a signal generator for generating digital data spread with a PN (pseudo-noise) code, a modulator for modulating the digital data on a carrier, and a transmitter for transmitting the modulated digital signal to the center unit through a transmission line. The center unit includes a receiver for receiving the modulated digital signal, a PN code generator for locally generating a PN code which corresponds to the transmitted PN code, a multiplier supplied with outputs of the receiver and the PN code generator to produce a digital signal de-spread from the PN code, a demodulator connected to the multiplier to reproduce the digital data from the modulated digital signal, and a memory for storing the PN code when the signal level of the multiplier exceeds a predetermined value. The stored PN code is retrieved from the memory to enable rapid synchronization with the next transmission received from the terminal unit.

Bidirectional digital signal communication system

A scrambling system for an audio frequency signal in which an audio signal is divided into blocks, each block being formed of a plurality of frames, the plurality of frames are rearranged on a timebase in a predetermined order at every block so as to be encoded and the encoded signal is re-arranged on the timebase in an original order so as to be decoded, in which there are provided a first signal processing circuit for inserting a redundant portion into a portion between adjoining frames and timebase-compressing the frames in response to the redundant portions upon encoding, a control signal generating circuit for inserting a control signal other than an audio information into the redundant portions, a control signal detecting circuit for detecting the control signal upon decoding and a second signal processing circuit for removing the redundant portions in synchronism with the detected control signal and timebase-expanding the frames in response to the redundant portions. Therefore, even when the audio signal is transmitted through a system in a transmission path having a timebase fluctuation such as a transmission path of a VTR (video tape recorder) and the like the frequency band region of which is restricted, the signal waveform is not distorted and a noise is not mixed therein so that the scrambling communication having high quality and high reliability can be presented.

Scrambling system for audio frequency signals

In tuning apparatus, a sensor senses when a tune indicating signal has been produced by the IF section so as to enable an adjusting circuit to change the tuning condition of the apparatus by a predetermined frequency step and then to disable the adjusting circuit if the tune indicating signal still is sensed following this frequency change so as to maintain the last-attained tuning condition. Alternatively, if the tune indicating signal no longer is sensed after the tuning condition has been changed by the predetermined frequency step, the tuning section is returned to its preceding tuning condition by this predetermined frequency step. Consequently, if the received signal is a high level signal at a frequency within a predetermined range from a broadcast frequency, the tune indicating signal is produced when the tuning condition of the tuning section differs from the broadcast frequency by this predetermined frequency step; and the tuning condition then is changed by this step so as to arrive at the desired broadcast frequency. If, however, the received signal is a low level signal, the tune indicating signal is produced only when the tuning condition of the tuning section coincides with a desired broadcast frequency, and then this tuning condition is changed by one step followed by a return of one step to the proper condition.

Tuning apparatus

An information transmitting system including a transmitter and at least one receiver. The transmitter includes a modulator which is modulated by a first control signal intermittently, and whose center frequency is changed continuously in response to a second control signal. The receiver is provided with a frequency discriminator which demodulates the first and second control signals and the first control signal is applied as a first remotely controllable signal in digital fashion and the second control signal is applied as a second remotely controllable signal in analog fashion in the receiver.

Remote control system for radio receiver

A noise-squelching circuit in which a phase-locked loop supplies an identifiable output signal that distinguishes between those times when the voltage-controlled oscillator in the loop is locked onto an incoming carrier, and those times when it is not. This identifiable signal controls a muting circuit to allow the information modulated onto the incoming carrier to pass through the muting circuit to an output terminal only when the loop is locked to an incoming signal but not when the loop is not locked onto a carrier.

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Kanagawa, Japan

Masakatsu Toyoshima