摘要:
A video mixing apparatus mixes a graphics video image and a playback video image at a plurality of mixture ratios in one image plane. Fade data indicative of the mixing ratio of at least one line of the playback video signal and the graphics video signal is sequentially generated in accordance with a predetermined order. The fade data is held into holding means and is outputted from the holding means synchronously with a horizontal sync signal. The levels of the playback video signal and the graphics video signal are individually adjusted in accordance with the fade data outputted from the holding means and the adjusted signals are added. The playback video signal and the graphics video signal are mixed at the mixing ratio set every line of one image plane. In a video apparatus using the graphics video image and playback video image, various kinds of effective video images can be formed by mixing the graphics video image of every video image such as background, person, characters, or the like and the playback video image.
摘要:
A video image mixing apparatus which can prevent a fluctuation of a mixed video image by a mixed video signal in the case where a playback video signal obtained by playing a recording medium in a special playing mode and a graphics video signal. When a discontinuity of the phase of a color burst signal in the playback video signal obtained by playing the recording medium is detected, the playback video signal and the graphics video signal are delayed by a predetermined time period and the delayed signals are mixed subsequently, thereby keeping the phases of chroma signals of the playback video signal and graphics video signal equal even in a special playing mode such as a still image reproducing mode or the like. In another embodiment, the mixed video signal of the playback video signal and graphics video signal is delayed by a predetermined time and is generated.
摘要:
A video signal mixing apparatus for mixing a playback composite video signal produced by playing a recording medium and a graphics composite video signal generated on the basis of video data read from a memory device, wherein a vertical synchronizing signal of the playback composite video signal is forcedly generated in response to a vertical synchronizing signal of the graphics composite video signal to make the number of horizontal scanning lines of the playback composite video signal coincident with the number of horizontal scanning lines of the graphics composite video signal.
摘要:
A video signal recording apparatus digitizes video signals, writes the digital data in a memory and then reads them therefrom before recording the video signals on a recording medium. The orders of access to the addresses in the memory in write and read modes differ from each other with a predetermined relationship. A video signal reproducing apparatus reads recorded video signals from a recording medium, digitizes the video signals, writes the digital data in a memory and then reads them therefrom. The orders of access to the addresses in the memory in write and read modes differ from each other with a predetermined relationship.
摘要:
When reproducing record information from one of a plurality of optical record mediums of various types, which distances from external surfaces thereof to information record surfaces thereof recorded with the record information are different from each other, a focus servo controlling method carries out the focus servo control. The method is provided with the steps of: judging a type of an optical record medium to be reproduced; irradiating an information record surface of the optical record medium with a plurality of light beams to be focused on different positions on one optical axis; moving, so as to change a relative distance parallel to said one optical axis between an objective lens for prescribing focal points of the plurality of light beams respectively and the information record surface, the objective lens; receiving a plurality of reflection lights of the plurality of light beams reflected from the information record surface respectively, associated with a change of the relative distance; generating a plurality of focus error signals on the basis of each of the plurality of received reflection lights. The method is further provided with the step of extracting one of the generated focus error signals, which corresponds to the type of the optical record medium judged by the judging step.
摘要:
In a recording medium playing apparatus, information on the medium (which is not reproduced when the medium is operated in a special playback mode) can not be arbitrarily reproduced when the medium is operated in an ordinary playback mode. A mask-clearing signal is stored in a memory at every unit information of reproduced one of all the information, the one being reproduced during the special playback mode in which the medium is operated when a predetermined data is processed. The apparatus judges whether the mask-clearing signal is stored in the memory at every unit information of the medium when the medium is operated in the ordinary playback mode, and unless the mask-clearing signal is stored, the unit information is inhibited from being output. In the ordinary playback mode, all of the information is not reproduced so as to retain the value and meaning of the game's software and become meaningless.
摘要:
A servo apparatus for an optical disk player which coarsely adjusts the loop gain in advance in an open state of a servo loop, and then closes the servo loop to finely adjust the loop gain. This ensures accurate and sure gain control even if there are differences between reflection factors of the recording surfaces of disks being played or is a stain or the like on an objective lens of the player.
摘要:
A method of setting the loop gain of a tracking servo loop of a disc player. The optimum loop gain is set for each playing of a disc without being influenced by disc eccentricity. The servo loop is opened, the disc is driven at a revolving speed which is lower than that of normal playback at the current position of the information reading spot, and a tracking error signal is obtained. The loop gain is set on the basis of a plurality of the sample values.
摘要:
The distances from external surfaces to information record surfaces of the optical record mediums of various types are different from each other. An optical record medium judging method of judging the types of the optical record mediums is provided with the steps of: irradiating an information record surface of an optical record medium to be reproduced with a plurality of light beams to be focused on different positions on one optical axis; moving, so as to change a relative distance parallel to said one optical axis between an objective lens for prescribing focal points of the plurality of light beams respectively and the information record surface, the objective lens; receiving a plurality of reflection lights of the plurality of light beams reflected from the information record surface respectively, associated with a change of the relative distance; generating a plurality of focus error signals on the basis of the plurality of received reflection lights respectively; and judging a type of the optical record medium by comparing levels of the generated focus error signals respectively with a predetermined standard level.
摘要:
A disc playing apparatus having a tracking servo loop and a focus servo loop is configured such that a transfer function of at least one of the servo loops is adjustable. Disc defect detection signals are generated in response to a change in a low frequency component and a high frequency component of a read signal output from the pickup, and the transfer function of at least one of the tracking servo loop and the focus servo loop is adjusted in response to the disc defect detection signals. According to another feature of the invention, the transfer function of at least one of the tracking servo loop and the focus servo loop is gradually changed each time an erroneous jumping movement of the information reading light spot is detected by information contained in the read signal output by the pickup.