KR970076646A - Digital V-Cyl's variable speed regenerator - Google Patents

Abstract

DCVR shift playback apparatuses are provided, which may cause a tracking error when the tape is deteriorated due to high precision or sagging of the tape, and other problems that multiplexing becomes complicated because it is required to accurately record the position at the time of recording Speed recording data on a helical track only for the purpose of variable speed reproduction and repeatedly recording partial change data of the same image on one track at the time of data recording for executing various speeds (3, 5, 7 ...) In order to solve the problem of shortening the use time of the digital video image, the variable speed data is recorded on the linear track by using the linear head during the recording of the digital image, and the variable speed reproduction is performed using the linear head during variable speed reproduction.

In addition, in a VCR that records and reproduces analog video / digital video signals, it is possible to record a variable speed data by using a linear head in an audio track not used for recording a digital video signal, .

In addition, in a DVCR for recording a digital video signal according to the MPEG standard, an I-frame capable of realizing one complete image is detected and a data amount of the detected I-frame is reduced, In the variable speed data recording area of the vehicle.

Description

Digital V-Cyl's variable speed regenerator

Since this is a trivial issue, I did not include the contents of the text.

FIG. 2 is a block diagram of a DVCR digital video data recording and reproducing apparatus according to a first embodiment of the present invention. FIG. 3 is a track configuration diagram of a tape according to the present invention. Fig. 2 is a block diagram showing a variable-speed data recording and reproducing apparatus of a DVCR according to a first embodiment of the present invention; Fig.

Claims (6)

1. A DVCR having a variable speed playback function, comprising: means for extracting speed change data from input digital video signals; Means for recording the extracted speed change data on a linear track of the tape using a linear head; Control means for issuing a control signal to execute a shift position and a shift mode of the shift data; Reproducing means for reproducing the transmission data recorded on the linear track using a linear head; And means for changing the running speed of the tape in accordance with one control signal of the control means for executing the shift mode. The variable speed playback apparatus of claim 1, wherein the speed change data extracting means extracts only I-frames out of the MPEG digital data. 3. The apparatus of claim 2, further comprising: an I-frame data reduction unit decreasing a data amount of the detected I-frame; Further comprising: storage means for temporarily storing the reduced I-frame data. 3. The apparatus of claim 2, further comprising: means for detecting a start position of I-frame data by performing semi-decoding on a transmission packet of an input MPEG standard digital video signal; A VLD for extending the I frame data in which the start position is detected; Means for extracting all or part of the elongated I-frame data as shift data; Storage means for temporarily storing the extracted I-frame data; Further comprising: means for encoding the I-frame data stored in the storage means into a format recognizable by an MPEG decoder and converting the encoded I-frame data into a sync block format to which sync, ID, and parity information are added. An A / D combined VCR, comprising: means for determining whether an input video signal is a digital signal or an analog signal; Means for extracting digital data for transmission in the case of a digital video signal; Means for recording the extracted speed change data on a linear track of the tape using a linear head; And means for reproducing the variable speed data on the linear track on which the speed change data is recorded by using a linear head. 6. The apparatus of claim 5, further comprising: first switching means for selectively outputting a result of the discrimination of the input video signal so as to be recorded on a tape according to a selection signal; Means for changing the running speed of the tape in accordance with a control signal during a speed change reproduction; Second switching means for selectively outputting an analog / digital signal in accordance with a selection signal when reproducing the transmission data; Further comprising control means for providing a control signal for the one selection signal. ※ Note: It is disclosed by the contents of the first application.