Sony Corporation

Takato Narita

Norio Tanaka

Toshiya Asai

Kazuo Kamiyama

A method for coding a video signal made up of a plurality of sequential video frames. First, correspondence information relating color frame information values to types of video coding is provided, the color frame information values and types of coding being related on a one to one basis such that for each value of color frame information there is only one corresponding type of coding. Next, a value of color frame information is determined for each video frame and the type of coding to be used on the frame is selected by associating the frame's color frame information with a coding type via the correspondence information. Finally, the image frames are coded according to the coding types selected by referencing the correspondence information.

Coding method and recording and reproducing apparatus

In a coding method and a recording and reproducing apparatus, a moving image and a compressed moving image can be coded and decoded by means of the GOP sequence without using the GOP sequence information. The image frames are arranged in the same frame order in each of the plurality of GOP's. And at the same time, each of the GOP's are set so that the GOP is processed in the same GOP sequence. Then, correspondence information is set that allows the color frame sequence information to correspond to the GOP sequence on a one to one basis. The GOP sequence that corresponds to the color frame sequence information extracted from the moving image and the compressed animated image data is selected by using the set information to perform the coding process and the decoding process by means of the selected GOP sequence.

In an apparatus for recording video signals within recording tracks extending obliquely across a magnetic tape, having a rotary drum with first and second pairs of heads spaced from each other pair by a distance corresponding to one track pitch in a direction parallel to the axis of the rotary drum for recording video signals simultaneously on two recording tracks, while sequentially recording video signals on the magnetic tape within the recording tracks the video signals are recorded on said magnetic tape for longer than at the time of normal recording in such a manner that one of the two recording tracks on which the video signals are recorded by one of the second pair of heads overlaps part of the other recording track which is next to the one recording track and on which the video signals are recorded by one of said first pair of heads, so that by controlling the moving speed of the moving means in such a way so as to be slower than the normal moving speed at the time of normal recording, reductions in the signal to noise ratio can be avoided, and effective long time period recording can be achieved.

Apparatus for recording video signals within recording tracks extending

A tracking control circuit for use in a composite digital video tape recorder, wherein the phase of a control signal is adjusted on the basis of a reproduced envelope signal in an interval of low correlativity to recorded contents out of the composite digital video signal reproduced by a recording head, so that the tracking position of the recording head relative to a video track is controlled to a predetermined proper position. In this circuit, accurate tracking control can be achieved at enhanced precision without enlarging the circuit scale or increasing the production cost.

Tracking control circuit

A recording/reproducing apparatus with an editing function delivers a control command to a tape running servo through a system controller of a system control system at the time of phase adjustment, thus to control a capstan motor. At this time, servo status information is delivered from the capstan motor to the system controller through the tape running servo. Whether or not adjustment of tracking is completed is judged in accordance with the above information to automatically carry out adjustment of tracking, thereby making it possible to automatically conduct, at the time of editing, adjustment of tracking, which was carried out by manual operation prior to editing work, without supplementing a new circuit.

Tape editing apparatus with automatic tracking adjustment prior to

One color difference signal, for example, (B-Y) is modulated by a signal from a constant frequency wave generator which is phase-shifted by 90 degrees and other color difference signal (R-Y) is modulated by a signal generated from the constant frequency wave generator after the color difference signal (R-Y) is added with a predetermined DC level during a predetermined duration. This predetermined DC level is controlled by a variable resistor, and the predetermined duration is determined by a burst flag pulse. The modulated signals of the both color difference signals (R-Y), (B-Y) are mixed by a mixer.

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Kanagawa, Japan

Takato Narita