Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1996-11-21
2001-12-25
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C386S349000
Reexamination Certificate
active
06334024
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a helical scan data recording apparatus and a helical scan data reproducing apparatus.
2. Description of the Prior Art
A helical scan data recording apparatus for recording digital data and recording error check code data in relation to the digital data is known.
FIG. 11
is an illustration of the prior art error check code data generation method. (n
2
−k
2
)×n
1
bits of inner parity code and (n
1
−k
1
)×n
2
bits of outer parity codes are generated to the k
1
×k
2
digital data. Therefore, if there is data defected by a random error (data defection without a correlation) or a burst error (data defection with a correlation) it can be restored using the combination of the inner and outer parity codes. A combination of the inner and outer parity codes is referred to as a production code.
A first prior art data recording apparatus records the digital data and records the inner and outer parity codes and a prior art data reproducing apparatus reproduces the digital data with the defected data restored by using the inner and outer parity codes.
A second prior art data recording apparatus records data with data interleaved (changing an order of data on recording) to prevent defection of successive data due to a drop out during recording or reproducing data or during transmission of data. As the result, the defected data is diffused if there is a drop out. It is easy to restore the defected data which are diffused using the error check code.
Moreover, a prior art digital video tape recorder for recording data on a magnetic tape through helical scanning records video data and sound data on each track having a video data region and a sound data region.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide an improved helical scan data recording apparatus and an improved helical scan data reproducing apparatus.
According to the present invention, a first helical scan data recording apparatus is provided, which comprises: a receiving portion for receiving data; memory circuits for storing the data from the receiving portion and check code data; an error check code generation circuit for reading the data in data blocks of a predetermined amount of data from the memory circuits, generating check codes in accordance with the read data, storing the check code data in the memory circuits to form a data block including the read data and the check code data generated in accordance with the read data; an interleaving portion for reading the data and check code data for every data block from the storing means and interleaving a predetermined number of the data blocks, which provide an editing unit; and a recording portion for recording the interleaved data blocks on a magnetic tape through helical scanning of every editing unit, wherein the data blocks in the editing unit are recorded on consecutive t tracks on the magnetic tape. The data includes video data and corresponding sound data. The video data is recorded on the magnetic tape on consecutive (t−p) tracks and the sound data is recorded on the magnetic tape on consecutive p tracks, t and p being natural numbers, p<t.
According to this invention, a second helical scan data recording apparatus is provided, which comprises: a receiving portion for receiving data; memory circuits for storing the data from the receiving portion and check code data; an error check code generation circuit for reading the data in data blocks of a predetermined amount of data from the memory circuits, generating check codes in accordance with the read data, storing the check code data in the memory circuits to form a data block including the read data and the check code data generated in accordance with the read data; an interleaving portion for reading the data and check code data for every data block from the storing means and interleaving a predetermined number of the data blocks in accordance with interleaving type data, the predetermined number of the data blocks providing an editing unit; and a recording portion for recording the interleaved data blocks on a magnetic tape through helical scanning of every editing unit, wherein the data blocks in the editing unit are recorded on consecutive t tracks on the magnetic tape. The data includes video data and corresponding sound data. The video data is recorded on the magnetic tape on consecutive (t−p) tracks and the sound data is recorded on the magnetic tape on consecutive p tracks, t and p being natural numbers, p<t, and the recording portion further records the interleaving type data on the magnetic tape as a sub-code data on the t tracks.
In the second helical scan data recording apparatus, the video data is recorded on consecutive (t−p) tracks to have V sectors on each of the (t−p) tracks, the sound data is recorded on consecutive p tracks to have U sectors on each of the p tracks, the sector corresponds to the data block, the interleaving means interleaves the data with a unit of k sectors, and V and U are natural numbers, and k is a common divisor of U and V.
According to this invention, a third helical scan data recording apparatus is provided, which comprises: a receiving portion for receiving data; memory circuits for storing the data from the receiving portion and check code data; an error check code generation circuit for reading the data in data blocks of a predetermined amount of data from the storing means, generating check codes in accordance with the read data, storing the check code data in the memory circuits to form a data block including the read data and the check code data generated in accordance with the read data; an interleaving portion for reading the data and check code data for every data block from the memory circuits and interleaving a predetermined number of the data blocks in accordance with interleaving type data, the predetermined number of the data blocks providing an editing unit; and a recording portion for recording the interleaved data blocks on a magnetic tape through helical scanning with a predetermined number of tracks formed for every editing unit and recording the interleaving type data on the magnetic tape as a sub-code data on every track.
According to this invention, a fourth helical scan data recording apparatus is provided, which comprises: a receiving portion for receiving data; memory circuits for storing the data from the receiving portion and check code data; an error check code generation circuit for reading the data in data blocks of a predetermined amount of the data from the memory circuits, generating check codes in accordance with the read data, storing the check code data in the memory circuits to form a data block including the read data and the check code data generated in accordance with the read data; an interleaving selection portion for selecting one from predetermined interleaving patterns in accordance with the editing unit and generating interleaving type data in accordance with the selected interleaving pattern; an interleaving portion for reading the data and check code data for every data block from the memory circuits and interleaving a predetermined number of the data blocks in accordance with the selected interleaving pattern, the predetermined number of the data blocks providing an editing unit; and a recording portion for recording the interleaved data blocks on a magnetic tape through helical scanning with a predetermined number of tracks formed for every editing unit and recording the interleaving type data on the magnetic tape as sub-code data on every track.
According to this invention, a helical scan data reproducing apparatus for reproducing data including error correction data on a magnetic tape and interleaving type data indicative of an interleaving pattern on a sub-code area on every track through a helical scanning is provided, it comprises a data reproducing portion for reproducing the data and interleaving type data from the magnetic tape; memory circuits for storing t
Harumatsu Mitsuo
Higurashi Seiji
Ohishi Takeo
Connolly Bove & Lodge & Hutz LLP
Nguyen Huy
Victor Company of Japan Ltd.
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