Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Akira Usui

Kazuhiko Kubo

Hiroyuki Nagai

Kiyoshi Imai

Seiji Sakashita

Toshiro Nishio

Akira Mishima

Hideyuki Ikuhara

Kiyokazu Hagiwara

Tadashi Yamada

Masaaki Kobayashi

Masazumi Yamada

Akira Iketani

Hiroaki Ozeki

Ippei Kanno

Akihiro Takeuchi

Hidetoshi Takeda

Takayuki Kimoto

Takeshi Sato

Ryoji Asada

Minoru Ueda

Kiyotake Fukui

Minoru Miyata

Takashi Fujino

Hideyuki Miyake

Tetsuo Kutsuki

Tamotsu Akeyama

Toshimitsu Fujimori

Susumu Saitou

Yoshitaka Sakamoto

The present invention includes a film or video image pickup signal recording/reproduction system having an image pickup apparatus outputting an image pickup signal, a recording apparatus recording the image pickup signal, a reproduction apparatus reproducing the recorded signal, a characteristic conversion apparatus switching the characteristic of the reproduced signal, and a display apparatus displaying the signal output from the characteristic conversion apparatus. The image pickup apparatus has two kinds of gamma curve characteristics. The gamma curve characteristic data is recorded by the recording apparatus and extracted by the reproduction apparatus. The gamma curve characteristic of a reproduction image is switched by the characteristic conversion apparatus depending on the data. The image is output on a display apparatus.

Characteristic correction apparatus for gamma correcting an image based on the image type

A television receiver receiving an analog video signal, comprises additional information detecting means for separating and extracting an additional information code from the analog video signal, and outputting the additional information code; additional information recording means for recording the additional information code output from the additional information detecting means; additional information writing switch means for passing or blocking the additional information code that is output from the additional information detecting means toward the additional information recording means, in response to a control signal; conversion means for converting the additional information code output from the additional information detecting means or the additional information code reproduced from the additional information recording means into a character or an image; and signal synthesizing means for synthesizing the analog video signal and the additional information that has been converted into a character or an image by the conversion means, and outputting the synthesized signal as a monitor output signal.

Television receiver and additional information transmitting method

When transmitting encoded video data and audio data, a transmitter also transmits a decoding method generated by decoding-method generation means In the case of a receiver , decoding control means controls decoding means in accordance with a received decoding method and thereby, decodes video data and audio data . Thus, it is unnecessary for the receiver to previously prepare all of a plurality of decoding methods and the transmitter does not need to encode video data or audio data in accordance with the decoding method owned by the receiver

Data transmitter, data receiver, processor, equipment managing device, equipment managing system, data transmitting-receiving system, and medium

In a television signal transmitting and receiving apparatus, a digitally coded television signal, such as an MPEG2-Video stream, is transmitted, and an accounting level requested by the use is input to the receiver, whereby the decoding coefficient at decoding in an MPEG2-Video decoder is varied to obtain n image having a resolution according to the accounting level. In this apparatus, it is possible to offer a service with a resolution according to the accounting level.

Method and apparatus for transmitting and receiving television signal

The present invention relates to a television tuner capable of receiving television broadcasting, CATV and satellite broadcasting. The television tuner includes a double superheterodyne tuner for receiving television signals, having an up-converter, a down-converter and a coupler for coupling the up-converter and down-converter, and the television tuner also includes a BS second mixer portion and a FM demodulator, for receiving signals from a broadcasting satellite. The double superheterodyne tuner, the BS second mixer portion and the FM demodulator are disposed in a housing, a combination of the up-converter and the BS second mixer portion is desiredly separated from the down-converter, the coupler is disposed in a space between the combination and the down-converter, and the FM demodulator is disposed in the remaining space of the housing.

Television tuner unit having shield housing

A station selecting station apparatus has a first mixer and a first local oscillation circuit for frequency converting the input signals (television signals) into a first intermediate frequency signal, a second mixer and a second local oscillation circuit for frequency converting the first intermediate frequency signal into the second intermediate frequency signal. A variable voltage device capable of varying and outputting by stages the direct current fixed voltage as the signal for controlling the second local oscillator is provided, the minimum potential width of the direct current fixed voltage is set so that the frequency displacement (unit variation amount) of the second local oscillator obtained by the potential difference is smaller than the frequency resolution of the first local oscillator.

Station selecting apparatus

A tuner station apparatus includes a first mixer for combining an input signal and a first local oscillation signal, and a second mixer for combining an output of the first mixer and a second local oscillation signal. The first and second local oscillation signals are generated by first and second PLL circuits, respectively. Each of the first and second PLL circuits include a frequency divider, a variable frequency divider, a phase comparator, a low pass filter, and a voltage controlled oscillator. The frequency divider of the first PLL circuit has a higher frequency division ratio than that of the second PLL circuit.

Tuner station selecting apparatus

Receiving apparatus for receiving a BS-IF signal converted into a

Television tuner for common use in BS/UV

Shielding device

Disclosed is a local oscillator using a dielectric coaxial resonator (27), which is availably used as a fixed local oscillator in double-spot tuners and CATV converters, and which is arranged so that an AFC voltage is applied to a variable-capacitance diode (23) from an output terminal (E) of a frequency control circuit through a first resistor (35), the variable-capacitance diode having its one end being connected to a center conductor of a dielectric coaxial resonator (27) through a capacitor (25) and its other end being AC grounded, and that a first reference potential (V.sub.A) lower than a source voltage (V.sub.CC) by a predetermined value is given to the variable-capacitance diode (23), the one end of the variable-capacitance diode (23) being connected to the source voltage (V.sub.CC) through a second resistor (22), whereby the voltage impressed across the variable-capacitance diode (23) can be kept constant regardless of a variation in the source voltage to thereby prevent the oscillation frequency from fluctuating.

Voltage controlled oscillator having constant tuning bias voltage

A channel selection apparatus having a double superhet tuner section (15) for converting one of a plurality of television channels contained in an input signal to a fixedly predetermined channel, includes an AFC circuit (11) for producing a frequency control voltage to execute closed-loop frequency control of the second local oscillator (5) of the tuner section while an AFC switch (16) is set in a first condition, whereas when the AFC switch is set in a second condition, a fixed frequency control voltage is applied to the second local oscillator and the frequency control voltage is applied to adjust the oscillation frequency of the first local oscillator (2) of the tuner section such as to compensate for any offset in the transmission frequency of a currently selected channel.

Channel selection apparatus having automatic frequency compensation for

A high frequency amplifier circuit based on an amplifying transistor, e.g. a dual-gate FET, having an A.G.C. voltage applied to a control terminal thereof to control the transistor DC operating current, has a diode connected between an input electrode of the transistor and a source of an input high frequency signal. All or part of the DC operating current of the transistor is passed through the diode as the operating current of the diode to thereby produce a high degree of attenuation by the diode when the transistor current level is small, so that reduced cross modulation interference is produced by the transistor when a high degree of gain reduction is executed by A.G.C. control.

High frequency amplifier circuit

Oscillator including a transistor used both as constant current source

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Takatsuki, Japan

Akira Usui