Lg Electronics Inc.

Doo Hee Lee

Tae Joon Park

Yung Gil Kim

Sang Joon Woo

Dong Hwa Lee

Man Chul Choi

Jae Ryong Kim

Soon Ki Lim

Je Hyoung Lee

Tae Kyung Kwon

Sang Mun Lee

Tae Suck Bark

Yong Hoo Sheen

Joong Kwon Joh

Tae Seok Yang

Kyoung Ii Min

Kyoung Il Min

A synchronizing signal detecting circuit is disclosed. The sycnhronizing signal detecting circuit is characterized in that full matching or n mismatching is determined depending on a sub code area, a main data area, and the state of a system. Input data are compared with a predetermined synchronizing pattern and then a synchronizing signal is detected depending on the determined matching degree. As a result, since the synchronizing signal is detected, it is possible to minimize the missing synchronizing signal. The synchronizing signal detected in error is primarily removed using the window signal and the remaining synchronizing signal detected in error is finally removed by the error flag signal err_flag output as a result of ID ECC. Therefore, the actual synchronizing signal and the forcible synchronizing signal do not occur simultaneously, so that error detection of the synchronizing signal can be minimized. Furthermore, since the window area is varied depending on the state of the system, the sub code area, the main data area, each initial area of each area, and the other areas, it is possible to minimize the missing synchronizing signal. In addition, since the data are realigned and output in parallel, the accurate data can be output even if data slip occurs, thereby preventing error operation.

Synchronizing signal detecting circuit

A video signal recording and reproducing apparatus for a digital video cassette tape recorder by which it is possible to judge the transmission amount of the digital data inputted from a digital source, the type of the video tape, and whether or not the tape is recorded in accordance with the judgment result, for thus automatically controlling a recording mode and a reproducing mode, which includes a tape type detector for judging a tape type in accordance with a recordable wavelength of the video tape on which a digital signal is recorded; a data rate detector for detecting and judging a data transfer rate of a digital signal, and a controller for varying a recording or reproducing speed in accordance with the judged tape type and the data transfer rate of the digital signal.

Video signal recording and reproducing apparatus for digital video

An improved video signal recording and reproducing apparatus for a digital video cassette tape recorder by which it is possible to divide, record and reproduce a digital video signal on a low density video tape into multiple tracks based on the amount of data recordable on one track of a high density video tape by controlling a recording/reproducing speed and a tape running speed in accordance with a judgement of the type of the video tape having a predetermined recordable wavelength. The apparatus includes a detector for detecting the type of the video tape in accordance with a recordable wavelength of the video tape, a judgement section for judging the type of the tape by receiving a detected tape type signal from the detector, and a controller for controlling a recording and reproducing speed in accordance with the judged tape type.

Tape-independent video signal recording and reproducing apparatus

A synchronizing signal detecting apparatus for a digital video cassette recorder (DVCR), which can detect a more stable synchronizing signal by detecting the synchronizing signal in a parallel processing method includes input signal convertor for converting input serial data, a first head switching pulse and a first clock into parallel data, a second head switching pulse and a second clock, a vertical synchronizing signal detector and a block synchronizing signal detector for respectively detecting a vertical synchronizing signal and a block synchronizing signal from the parallel data, second head switching pulse and second clock output from the input signal converter, and a data former for outputting finally output data in accordance with synchronizing patterns using the parallel and second clock. This apparatus allows a synchronizing signal to be detected more precisely. Also, the acquisition of slipped data is facilitated by rearranging output data in the unit of sync blocks.

Synchronizing signal detecting apparatus for digital video cassette

An index processor and processing method for digital VCR including the steps of: normally recording a user-selected program on video tape in a general recording mode; recording an index input after the program is recorded in an index recording mode, succeeding the end of a final program; normally reproducing a program recorded on video tape in a general playback mode; and reproducing the user-selected program according to the index recorded on video tape in the index reproducing mode, and recording a modified index.

Index processor for digital VCR and method therefor

An apparatus for a digital video tape recorder for detecting a sync signal in digital data includes: a data restoring device for producing serial data and a serial clock signal received from a reproducing head of the digital video tape device; a servo device for producing a head switching pulse and a super-video home system (S-VHS)/video home system (VHS) discriminating signal; an identification detecting device for producing a signal indicative of an end of reading one segment of tracks; and a sync signal detecting device, responsive to each signal produced by the aforementioned devices, for determining correspondence in sync patterns even in a case where not all corresponding bits coincide with one another, for removing erroneously detected sync patterns using a window situated around a position at which a sync signal is produced, and for detecting a sync signal.

Apparatus in digital video tape recorder for detecting a sync signal in

A reproducing apparatus for a DVCR having a reverse operation function includes a data restoring portion for restoring a serial clock and reverse-serial data from an input signal; a servo portion for outputting a reverse-playback signal; an ID detector for detecting an ID to thereby output first and second segment end signals; and a sync signal detector for detecting a block sync signal and a signal indicative of an initial position of a track for reverse playback, using the serial clock and reverse-serial data from the data restoring portion and the first and second segment end signals from the ID detector. The reproducing apparatus enables reverse playback as well as reverse playback skip play.

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Kyungki-do, South Korea

Doo Hee Lee