Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1997-06-20
2000-03-28
Garber, Wendy
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386 46, 386 52, 348705, 358906, H04N 5928
Patent
active
060441984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a digital signal recording and reproducing device provided with an editor, and in particular, to a digital signal recording and reproducing device such as a digital video tape recorder which is provided with an editor for editing a digital video signal and is used for recording and reproducing a digital video signal coded at a high efficiency.
2. Description of the Related Art
In recent years, with the trend of improving the image quality and promoting digitization of video equipment, there have been put into practice recording and reproducing devices which utilize digital recording instead of the conventional analog recording. As a representative apparatus, a digital recording video tape recorder (referred to as a digital VTR hereinafter) has been put into practice. The digital VTR has such a feature that the digital VTR has a high image quality as compared with the conventional analog VTR and is substantially free from deterioration due to dubbing. However, the digital VTR has such a disadvantage that the amount of data to be recorded significantly increases when a digitized video signal is recorded as it is. Therefore, in order to enable a long-time recording using a compact cassette tape, it is required to introduce a high efficiency coding technique for reducing the amount of data of the video signal. As a digital VTR signal format using the high efficiency coding, for example, a digital VTR format having the specifications of Consumer-Use Digital VCRs using a 6.3 mm magnetic tape (referred to as a DV format hereinafter) has been proposed by HD Digital VCR Conference (High Definition Digital Video Cassette Recorder Conference). According to the format, a 4:2:2 component signal, which conforms to the component signal digital coding standard of the current television system provided in ITU-R BT. 601 of ITU Recommendation, is compressed to about 1/6.7 thereof by the high efficiency coding, thereby allowing a long-time recording to be achieved with a 1/4-inch width compact cassette tape.
When considering the replacement of the conventional analog VTR (referred to as an analog VTR hereinafter) with a digital VTR, the digital VTR is required to have functions equivalent to those of the analog VTR. In general, an editor for the recording and reproducing device such as a VTR or the like has two processing systems of:
a tape processing system for recording a video signal on a recording medium such as a magnetic tape or the like, thereafter processing data reproduced from the recording medium to convert the same reproduced data into a video signal, and outputting the video signal (referred to as a tape processing system hereinafter); and
an electric-to-electric processing system for outputting an inputted video signal as a video signal as it is (referred to as an EE processing system hereinafter). These two systems can be selectively switched according to a VTR mode.
During reproduction, the tape processing system is normally selected, and the data reproduced from the magnetic tape is processed to be converted into a video signal, and then, the video signal is outputted to a monitor television set. During recording, the EE processing system is selected since the user is required to simultaneously monitor the video signal of the data that is being recorded on the magnetic tape by means of the monitor television set. Further, in an insertion editing stage in which a further video image or sound is inserted in a magnetic tape that has been already recorded, these two modes are used in combination. That is, the EE processing system is selected for the interval for which the insertion recording is performed, and the tape processing system is selected for the other interval since it is required to output the video signal of the data that has been already recorded on the magnetic tape to the monitor television set. A method for implementing the EE processing system and the tape processing system will be described in detail below.
The p
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Otaka Hideki
Tanaka Shinya
Yoshida Takayasu
Boccio Vincent F.
Garber Wendy
Matsushita Electric - Industrial Co., Ltd.
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