Ricoh Company, Ltd.

Yamaha Corporation

Canon Kabushiki Kaisha

Canon Seiki Kabushiki Kaisha

Masamichi Furukawa

Susumu Iguchi

Takurou Sone

Seiji Matsumoto

Akira Takahashi

Yoshio Serikawa

Toshihito Uchiyama

Toshio Suzuki

Saburo Hokari

Shigeru Yamaga

Shinichi Kanaya

Shingo Sanbe

Seiki Shiotsuki

Tatsuya Watanabe

Kazuyoshi Mochizuki

Daizoh Nagahara

Shigeru Taneichi

Kenji Isonaka

A digital data transmitting apparatus including a reproducing device classifies serial packet data that are read at a variable rate from a digital data medium and demodulates into at least picture data, audio data and other data, an MPEG transport stream (MPEG-TS) generating device generates an MPEG-TS based on the digital data, and a digital interface device converts the generated MPEG-TS into digital transmission data and transmits the digital transmission data at a predetermined transmission rate. A digital data receiving apparatus including a digital interface device is operable at a predetermined transmission rate, a digital data receiving device receives digital data via the digital interface device, an MPEG-TS reproducing device reproduces an MPEG-TS from the received digital data, a reproducing device classifies the reproduced MPEG-TS into at least picture data, audio data, and private data, and a control device controls the reproducing device based on the private data.

Digital data transmitting apparatus and receiving apparatus

A digital recording apparatus receives an analog signal containing picture and/or voice information, through an analog transmission line, and digitally records the analog signal. The analog signal is digitally recorded in a form containing electronic watermark information within a first portion of the analog signal containing the picture and/or voice information while adding copy control information indicating permission of free copying to a second portion of the analog signal not containing the picture and/or voice information when the detected electronic watermark information indicates permission of free copying. Digital recording of the analog signal is prohibited when the detected electronic watermark information indicates prohibition of copying, and the analog signal is digitally recorded with the copy control information indicating prohibition of subsequent recording added to the second portion of the analog signal when no electronic watermark information is detected. A digital recording apparatus is connected to a receiver system that receives a digital broadcasting wave signal containing picture and/or voice information, for digitally recording the received wave signal. The received wave signal is digitally recorded in a form containing electronic watermark information and copy control information, according to a determined copy restriction level when the electronic watermark information is detected in the received wave signal, and the received wave signal is digitally recorded in a form containing the copy control information, according to the copy restriction level when no electronic watermark information is detected.

Digital recording apparatus and method

Copying of digital data from a digital recording medium is controlled so as to prevent unauthorized copying. The digital data is transmitted from a transmitter-side apparatus to a receiver-side apparatus through interfaces thereof in a system of a plurality of digital apparatuses connected to each other through a bus and mutually authenticated. The interfaces permit transmission and receiving of the digital data only between the authenticated apparatuses. Copy control information indicating a copy restriction level is added to main data of the digital data recorded on the digital recording medium such that the main data contains a first portion containing at least one of picture information and voice information, and a second portion containing the copy control information. Electronic watermark information is added to the second portion of the main data. An error correction code is added to the main data, and then intentional error information having a particular pattern is added to the digital data. The reproducing and recording operations of the transmitter-side apparatus and the receiver-side apparatus are restricted with respect to the digital data in the digital recording medium, depending upon whether the digital recording medium is authorized one or not, which is determined based on the copy control information, the electronic watermark, and the error information.

Digital copy control method, digital recording medium, digital recording medium producing apparatus, digital reproducing apparatus and digital recording apparatus

A display device for a Compact Disc player includes a Q-channel information detection circuit, a specific information identifying circuit, an information sorting circuit, a character code train output circuit and a display. The Q-channel information detection circuit detects Q-channel information subcoding from a signal recorded on a Compact Disc reproduced by the Compact Disc player. The specific information identifying circuit identifies specific information by means of identifying code imparted thereto. The information sorting circuit sorts the specific information provided from the specific information identifying circuit into character code information and editing information. The character code train output circuit edits the character code information in accordance with the editing information as character information and the display indicates the character information concerning contents of the Compact Disc such as the title, name of the composer or performer. The display device also includes an image information processing circuit which detects image information from Q and R to W-channels on the Compact Disc and displays mixed information of character information and image information.

Display device for a compact disc player and a compact disc

In a disc recording medium such as a Compact Disc capable of preventing occurrence of a burst error due to a scratch or a black spot on a disc in which the same data is repeatedly recorded for error correction, at least one adjusting section is inserted in an interval between repeatedly recorded same data. The length of the adjusting section is set to a value at which the same frames of at least two same data are not located in parallel to each other. Occurrence of a scratch will not prevent reading of the frame in at least one of the data.

Disc recording medium and data recording method

A stepping motor having two stator units axially arranged. Each of the stator units includes an inner yoke and an outer yoke having a plurality of pole teeth circumferentially formed at a predetermined pitch around a rotor having magnetic poles. The outer yoke of one of the stator units is asymmetrically arranged so that the pole teeth thereof are shifted from center between the pole teeth of the inner yoke in a specific direction. As a result, a cogging torque is reduced, constant speed rotation is attained and variations in the output torque are eliminated. Variation in the generated torque are also reduced by controlling the drive pulse width, the drive voltage or the drive current during the driving operation in accordance with the number of excitation phases.

Stepping motor having at least one set of asymmetric stator pole teeth

A camera having a photovoltaic cell such as a solar cell is provided. A power supply circuit of a camera comprises a solar battery, a second battery and a switch. If the second battery is a secondary battery, the switch is closed to connect the solar and second batteries in parallel. Otherwise, the switch is kept open to disconnect the solar battery from the second battery. A particular upper cover structure is provided for mounting a photovoltaic device without deteriorating the rigidity and loosing light-tightness.

Energy saving camera

An integrating capacitor is connected between the inverting input and the output of an operational amplifier. A plurality of resistors are connected in series to the inverting input. A plurality of capacitors are connected between the inverting input and junctions of the resistors respectively. The time required for the output voltage of the operational amplifier to reach a predetermined level is an exponential function of a voltage applied to the inverting input through the resistors.

Integrating circuit

An electronic shutter driving device has a logarithmic expansion circuit which includes no semiconductor element such as a transistor and a field-effect transistor and comprises an operational amplifier, a series of resistors connected to an inverting input terminal of the operational amplifier, a plurality of capacitors interconnected between the inverting input terminal of said operational amplifier and the junctions, respectively, between the resistors and an integrating capacitor interconnected between the inverting input terminal and output terminal of the operational amplifier, a source voltage being applied to the output terminal or a reference voltage input terminal of said operational amplifier.

Electronic shutter driving device for camera

A DC-DC converter includes a blocking oscillator which is fed with a dc input from an input source and which oscillates to produce an output, which is rectified by a rectifier. The converter also includes an output voltage controlling transistor, the base of which is fed with the rectified output through a constant voltage element. The transistor controls a base current to an oscillating transistor which is contained in the blocking oscillator. The base current to this latter transistor is fed from the input source through a starting resistor and is also fed from the rectifier output through another resistor.

DC-DC converter

An address counter sequentially addresses locations in a shift register or random access memory in which a waveform is stored in digital form to display the waveform on a cathode ray tube. Several magnification ranges are provided so that a selected portion of the waveform may be viewed in magnified form. A manually controllable position counter selects the portion of the magnified waveform for viewing in such a manner that the center of the portion will remain in the center of the cathode ray tube when the system is switched between magnification ranges. The position counter is an up-down counter which is driven by a same clock pulse generator which drives the address counter. A variable frequency divider is provided between the clock pulse generator and the position counter in such a manner that the position counter is driven at a convenient speed regardless of the magnification range. Two manually controllable mark counters similar to the location counter are also driven from the clock pulse generator, and indicate memory locations for which respective markers are to be displayed on the cathode ray tube. The contents of the memory location corresponding to the first of the markers is displayed in digital form, and the time difference between the markers is also measured and displayed in digital form. Variable frequency dividers provide magnitude and time scaling for the digital displays, and also ensure movement of the markers on the cathode ray tube at a convenient speed regardless of the magnification range. The frequency dividers are switched so that the address and mark counters are driven at low speed when the selected portion for magnification and marks are addressed and at high speed at other times.

Waveform analysis system

Voltage comparators for actuating a camera shutter and a low-light indicating lamp respectively have inputs connected to junctions between photocells and resistors so as to be controlled in response to the light level. The voltage comparator for the low-light indicator energizes the indicator when the light level is below a low-light value from the time the shutter release button is partially depressed until the time the shutter is closed after the exposure. The voltage comparator for the shutter produces a shutter opening signal to open the shutter for the required length of time based on the light level. The output of the voltage comparator for the shutter is connected through a diode to the input of the voltage comparator for the low-light indicator so that the low light indicator is deenergized when the shutter is closed.

Shutter and low-light indicator actuating device for a camera

A memory device is provided for storing a photometric quantity that is sensed and photoelectrically converted, by a light receiving element disposed in the light path of the finder of a single lens reflex camera, and used for determining a shutter speed or exposure time, which device includes an analogue-digital converter for conversion of the photometric quantity into a digital quantity, and which converter includes a digital-analogue converter having a plurality of storage elements which correspond in number to one more than the number of manually settable change-over steps of the shutter speed.

Memory device of an electrical shutter for single lens reflex camera

An apparatus for producing identification cards including a photograph of a person and written material by using electrostatic and transfer printing techniques. A photoreceptor comprising a layer of photoconductive material on a conductive supporter is charged and is exposed to an optical image of a person to form an electrostatic latent image of the person on the photoconductive material layer. An identification card material comprising a layer of dielectric material on a conductive supporter is placed on top of the photoreceptor to transfer print the electrostatic latent image from the photoreceptor to the identification card material. Toner particles are then supplied to the dielectric material layer of the identification card material to develop the electrostatic latent image thereon into a visible image. Written matter may then be entered on the identification card material, and the identification card material may be protected by lamination.

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Hamamatsu, Japan

Masamichi Furukawa