Hitachi, Ltd.

Mitsubishi Denki Kabushiki Kaisha

Takashi Furuhata

Hiroaki Takahashi

Hitoaki Owashi

Nobuo Azuma

Yasufumi Yumde

Kenji Satoh

Masakazu Hamaguchi

Katsuo Mohri

Manabu Katsuki

Shigemitsu Higuchi

Hiroki Mizosoe

Katsumi Takeda

Taihei Nakama

Michio Hibi

Fujio Okamura

Takao Arai

Takaharu Noguchi

Yoshinori Okada

Yoshizumi Watatani

Keizo Nishimura

Atsushi Yoshioka

Takayasu Ito

Yasunori Kobori

Kazutaka Naka

Toshifumi Shibuya

Katsuo Konishi

Toshimichi Terada

Sadao Kubota

Yoshiyuki Azuma

Yuuhei Abe

Yoshinori Masuda

Masayoshi Kamo

Kotaro Kawamura

Shutoku Watanabe

Yasufumi Yunde

Yasuhide Mogi

Katsuo Mouri

Hiroaki Sando

Yuzo Maruta

A video signal recording and/or reproducing apparatus which is capable of recording and/or reproducing both high definition and standard television signals is disclosed. Accordingly, video signals of two systems such as the high definition and standard television signals can be recorded and/or reproduced by a single apparatus. The standard television signal is reproduced as a video signal having a high picture quality in a format similar to that of the high definition television signal. Even if the video signal to be recorded is the standard television signal, a reproduced picture having a higher picture quality than that of the standard television signal and having no distortion due to a difference in aspect ratios between the high definition and standard television signals can be provided.

Video signal recording and/or reproducing apparatus for recording and/or

A display device for information signals which performs highly efficient image display of a standard television signal, a high definition television signal, a progressive scanning television signal or a stereoscopic television signal on the same screen has a first signal input unit applied with the standard television signal, a second signal input unit applied with the high definition television signal, progressive scanning television signal or stereoscopic television signal, a mode designation unit for designating a mode for display of one of the signals, a signal conversion unit including a write unit for writing the first signal, at a frequency thereof, to memories and a read unit for reading the memories at a frequency which is nearly twice that of the first signal, a signal switching unit, a signal processing unit and a deflection switching unit, whereby a first display signal from the signal conversion unit or a second display signal from the second input terminal is selected and image-displayed on the same display unit through a deflection system. Through this, the cost of the device can be reduced, the standard television signal having less scanning lines can be displayed with substantially the same number of scanning lines as that of the high definition television signal, various kinds of disturbances can be eliminated to improve the image quality and a stereoscopic image can also be displayed.

Display device for information signals

An apparatus for recording and reproducing a video signal records all of effective line information required for transmission of respective picture images and voice information together with identification information in mutually resembling track patterns by setting the number of sampled picture elements per line (or block) and the number of lines (or the number of blocks) to be recorded in each track in accordance with a band ratio m of a first record video signal to a second record video signal. With this, it is possible to record and reproduce a plural types of video signals having mutually different bands and also different number of effective scanning lines and signal formats by one apparatus efficiently while checking enlargement of a circuit scale and with almost uniform picture quality performance in accordance with the difference of the bands.

Magnetic recording and reproducing apparatus of video signals

A magnetic recording apparatus of the rotary head helical scan type which can selectively record input information signals of a plurality of signal formats includes an input signal kind discriminating circuit, a controller for generating control output signals to set each section of the magnetic recording apparatus into a predetermined mode on the basis of a recording mode command, a recording signal processing circuit which is respectively switched to a predetermined mode in accordance with an output signal of the controller, and a servo control circuit, wherein there is an effect such that one magnetic recording apparatus can automatically record the input signals of a plurality of formats such as an NTSC signal, an HD signal, and the like in the optimum mode by a simple and easy to use method.

Magnetic recording apparatus with capability of recording signals of a

An audio signal recording and/or reproducing apparatus of a magnetic recording/reproducing apparatus for recording and reproducing audio signals and a video signal. An audio control signal converting circuit is responsive to a command for selecting an arbitrary one of audio signal modes of the 3-1 system, the 2-2 system and so on to convert an input audio control signal corresponding to the input audio signal mode into a recording audio control signal corresponding to the selected audio signal mode. An audio signal processing circuit converts the input audio signals into audio signals of the selected audio signal mode in accordance with the recording audio control signal. An identification signal generating circuit generates an identification signal including the recording audio control signal. The identification signal and the converted audio signals are recorded on the magnetic tape. Upon reproduction, the audio signals and the recording audio control signal indicating the mode of the audio signals are reproduced from the magnetic tape.

Audio signal recording/reproducing apparatus for recording and

Solid-state imaging elements each having a smaller number of pixels are employed to realize an imaging device for taking a high-definition picture which is four or more times larger in the number of pixels than each of the solid-state imaging elements, and also an apparatus for recording/playing back (or transmitting) the high-definition picture. A two-dimensional space which includes, at least, nH spatial sampling points in a horizontal direction and nV spatial sampling points (nV lines) in a vertical direction, totaling (nH.times.nV) spatial sampling points, is imaged under the condition that light is sensed at, at most, 1/2 of the sampling points of the two-dimensional space. Thus, the imaging device delivers as its output a video signal containing effective pixel information items which correspond to the light-sensed sampling points and which are, at most, (nH.times.nV)/2 in terms of the number of pixels.

High-definition imaging device, and apparatuses for recording and

In a magnetic recording device for magnetically recording Information on a magnetic recording medium by a magnetic head, the magnetic head is so oriented that the magnetic flux leaking at the head gap is at right angles with the direction of relative movement between the magnetic head and the magnetic recording medium and parallel with the surface of the magnet recording medium. The magnetic recording medium may have track portions formed of a magnetic material, and intertrack portions formed of a nonmagnetic material. The magnetic recording medium may alternatively be formed of convex track portions and concave intertrack portions.

Magnetic recorIding device

An audio signal recording and playback apparatus of a magnetic recording and playback apparatus operates to record and play back multiple audio signals together with a video signal in first and second recording areas formed in correspondence to audio signals of first and second sets each consisting of two channels. Among input stereo audio signals in four channels at most, two-channel signals corresponding to left and right side information are recorded as main audio signals in the first recording area and remaining two-channel signals are recorded selectively as ancillary audio signals in the second record area.

Audio signal recording and playback apparatus of magnetic recording and

An apparatus for correcting a time base of a video signal includes a first memory having a capacity of one line of a video signal and a second memory having a capacity of N lines of the video signal connected to the first memory. A video signal is written in the first memory according to a first control signal generated based on synchronizing information in the video signal and first clock pulses synchronized with the synchronizing information, the video signal written in the first memory is read from the first memory and written in the second memory according to a second control signal generated based on second clock pulses, and the video signal written in the second memory is read from the second memory based on a reference signal generated based on the second clock pulses.

Video signal processing apparatus for correcting time base of video

The system is made up of signal conversion unit for converting a video signal into two-line sum signal and difference signal for every two lines, time base conversion unit for time base converting the signals so that the transmission band of the difference signal is lower than the transmission band of the sum signal, and signal multiplexing unit for time-sharing multiplexing a time base converted sum signal and a time base converted difference signal.

Recording/reproducing apparatus employing sum and difference sequential

A method of reproducing video signals from a magnetic recording medium like a magnetic tape for a VTR to obtain high-quality video pictures even when dropouts occur in the medium, which includes the steps of separating synchronizing information from the video signals reproduced from the magnetic recording medium, detecting a dropout duration from the reproduced video signals, generating complete synchronizing information during a whole period of writing the signals in image information memories by compensating lost synchronizing information during the dropout, generating write address signals on the basis of the generated synchronizing information, writing reproduced video signals the memories on the basis of the generated write address signals while no dropout occurs, and leaving unchanged previously written video signals while a dropout occurs. According to an apparatus implementing the above method, reproduced pictures of high quality are obtained without jitters and skews due to dropouts.

Video signal processing method and apparatus with timebase disturbance

Video signals within one vertical scanning period are divided into a plurality of line block signals. These line block signals are shifted on time base, and a redundant interval (.tau..sub.H) is formed between two line block signals. Further, a plurality of segment signals, each of which includes a plurality of line block signals, are formed. A redundant interval (.tau..sub.S) is formed between two segment signals. The interval of the vertical blanking signal is shortened. Recorded video signals comprise the redundant intervals (.tau..sub.S) and the segment signals including the redundant intervals (.tau..sub.H) and the line block signals. A horizontal synchronizing signal of negative polarity, for example, is added in the redundant interval (.tau..sub.H). Magnetic heads are switched in the redundant interval (.tau..sub.S).

Video signal recording and reproducing apparatus and method suitable for

A signal processing method or apparatus in which an input signal is converted to a signal of a predetermined frequency characteristic and the resulting signal is reconverted to a signal of the original frequency characteristic, comprising: a first signal processing section for processing the input signal and having the first transfer function exp(-msT)/(1+K.multidot.cos(.omega.T) or a function approximating to the former function; a second signal processing section cascaded with the first signal processing section for processing the input signal and having a second transfer function of (1+K.multidot.cos(.omega.T).multidot.exp(-sT)), the first signal processing section having a linear phase characteristic and including an impedance circuit or an admittance circuit, each circuit including a ladder network of a plurality of inductance elements and capacitance elements.

Signal processing method and apparatus

A tracking control device for use in a rotary magnetic head type magnetic recording/reproducing apparatus, having a device for generating synchronizing signals in synchronism with the rotation of rotary magnetic heads, at a recording mode, records on a magnetic tape original information signals time-base converted so that the synchronizing information included in the information signals is in a predetermined synchronizing relation with said synchronizing signals, together with said synchronizing information; and at a reproduction mode of the recorded information, time-base converts the information signals and synchronizing information to restore the original information and controls the relative speed between the magnetic tape and rotary magnetic heads so that the time of the phase difference between the synchronizing signals and the reproduced synchronizing information is a predetermined value.

Tracking control method and device in rotary head type magnetic

In a rotary magnetic head helical scan type video tape recorder using a segment recording system, a video signal of one vertical scanning period is divided into n video signal blocks, where n is an integer equal to or larger than 2, and a redundant period having a selected length is inserted into the video signal blocks in a recording mode. Each of the video signal blocks has a number of horizontal scanning lines equal or smaller than N/n, where N is the number of the horizontal scanning lines in a field of the video signal. In a reproducing mode, a time axis error of reproduced series of the video signal blocks is corrected at least during the redunant periods. Then, the corrected blocks are converted into the original video signal.

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Kamakura, Japan

Takashi Furuhata