JP2002084500A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder that can perform long time recording by converting a received digital signal into other format needing less data amount and recording the converted signal. SOLUTION: The recorder that records a digitized video signal, is provided with a 1st conversion means 102 that converts the digital video signal received from an input terminal into video data with a 1st format, a 2nd conversion means 107 that converts the video data obtained by the 1st conversion means into video data with a 2nd format, a 3rd conversion means 110 that converts the video data obtained by the 2nd conversion means into video data with a 3rd format requiring less data quantity than the quantity of the video data with the 1st format, and a recording medium that selects the video data obtained by the 1st conversion means or the video data obtained by the 3rd conversion means and records the selected video data onto a recording medium 106.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal input device and a recording device, and more particularly to a device for handling digital signals conforming to the digital VCR standard capable of recording and reproducing on a recording medium such as a magnetic tape. The present invention relates to a recording apparatus that enables long-time recording when a DIF stream is received via a digital interface.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a configuration diagram of a conventional digital VCR. Digital VCRs include an SD format in which video data can be recorded in a standard length on a recording medium such as a magnetic tape, and an SDL format in which video data can be recorded for a long time. A recording apparatus for recording a digital image signal on a magnetic tape in the SD or SDL format will be described below.

In FIG. 2, reference numeral 201 denotes an input terminal of a digital image signal, 202 denotes a digital interface circuit conforming to IEEE 1394, 203 denotes an error correction coding processing circuit, 204 denotes a recording modulation processing circuit, 205 denotes a magnetic tape, and 206 denotes an image expansion. A processing circuit, 207 is an image output processing circuit, and 208 is an output terminal for outputting video data to a monitor. The operation will be described below.

In the digital VCR shown in FIG. 2, a digital image signal input to an input terminal 201 is sent to a digital interface circuit 202. The digital interface circuit 202 performs a deshuffling process to convert the data into video data of a predetermined image format.
Error correction coding processing circuit 203 and image decompression processing circuit 2
06. When the video data input to the image decompression processing circuit 206 is transferred in the SD format, the video data is decompressed in accordance with the SD format.
When the data is transferred in the format, the image is expanded in accordance with the SDL format and sent to the image output processing circuit 207. The video data input to the image output processing circuit 207 is converted into video data in an image format that can be output to a monitor, and output from the output terminal 208 to the monitor.

[0005] When the video data input to the error correction encoding processing circuit 203 is transferred in the SD format, an error correction code is added, and then the video data is input to the recording modulation processing circuit 204 for recording. After performing the modulation processing for the data, the data is recorded on the magnetic tape 205 as it is, and when the data is transferred in the SDL format, an error correction code is added.
After performing a modulation process for recording, the data is recorded on the magnetic tape 205 as it is.

FIG. 3 shows an example in which a magnetic tape serving as a recording medium is
FIG. 4 is an image diagram of a recording pattern recorded in a format. As shown in FIG. 3, in the SD format, one frame is composed of ten tracks.

FIG. 4 shows an example in which a magnetic tape as a recording medium is
FIG. 4 is an image diagram of a recording pattern recorded in the L format. As shown in FIG. 4, in the SDL format, one frame is composed of five tracks.

FIG. 5 is a diagram showing a data format of a digital interface standardized by the Consumer Digital VCR Council. FIG. 5 shows a transmission format for transmitting data of one DIF sequence in SD and SDL formats corresponding to the NTSC system through a digital interface. FIG. 5 shows 1DI
This is block data of a digital interface (DIF) corresponding to the F sequence. As shown in FIG. 5, one DIF sequence is composed of 150 DIF blocks. The 150 DIF block includes a header block H0, sub-code blocks SC0 and SCl, and VAUX blocks VA0 and V, which are auxiliary data.
Al, 3 blocks of VA2, 9 blocks of audio blocks A0 to A8, and video blocks V0 to V134
135 blocks. FIG. 6 shows the data structure of one frame input from the input terminal 201 of the digital signal. As shown in FIG. 6, one frame is composed of nDIF sequence data. In the SD format of the NTSC system, n = 10, and in the SDL format, n = 5. The 1DIF block is composed of a 3-byte ID and 77-height data, and data is input in the transmission order shown in FIG.

FIG. 7 shows a packet structure of SD format data input to the digital interface. In the digital interface, data is transmitted in packet units. In the SD format, one packet is composed of 6 DIF blocks. As shown in FIG. 7, the header block H0, subcode block SC0, SC1, VAUX block VA from the beginning of the data
The first packet is composed of 6 DIF blocks of 0, VA1, and VA2, and the next packet is an audio block A.
5 and 6 DIF blocks of video blocks V0 to V4. Hereinafter, one packet is composed of 6 DIF blocks in the transmission order shown in FIG. 5, and data of 25 packets is transmitted in one DIF sequence and 250 packets are transmitted in one frame.

FIG. 8 shows a packet structure of SDL format data input to the digital interface. In SDL format, one packet is 3DI
It is composed of F blocks. As shown in FIG. 8, the first packet is composed of a header block H0, a subcode block SC0, and a 3DIF block of SC1 from the beginning of the data, and the next packet is a VAUX block VA.
0, VA1, and VA2, and the next packet is composed of an audio block A0, a video block V0, and a 3DIF block, and a packet is composed of 3DIF blocks in the order of transmission shown in FIG. Data of 50 packets is transmitted in a sequence and 250 packets are transmitted in one frame.

As shown in FIGS. 3 to 8, the digital V
In CR, 1 in SD format and 1 in SDL format
The number of frames is different, and the SDL format has half the data amount of the SD format.

[0012]

As described above, in recording a DIF stream via a digital interface in a digital VCR, the input SD format DIF stream is subjected to a deshuffling process to add and record an error correction code. After performing a modulation process for recording, the data is recorded on a magnetic tape as it is.

For this reason, when a normal magnetic tape for a digital VCR is used, a tape for the same time as the input DIF stream is required, so that long-time recording cannot be performed.

The present invention has been made in view of such circumstances, and converts an input digital signal into a format having a smaller amount of data than the input format before recording. It is another object of the present invention to provide a recording apparatus capable of recording for a long time.

[0015]

In order to solve the above problems, the present invention mainly employs the following configuration.

In a recording apparatus for recording a digitized video signal, a first conversion means for converting a digital image signal input from an input terminal into video data of a first format, Second converting means for converting the obtained video data into video data of a second format, and converting the video data obtained by the second converting means into a data having a smaller data amount than the video data of the first format. A third conversion unit for converting the video data into a video data of a third format; and selecting one of the video data obtained by the first conversion unit and the video data obtained by the third conversion unit. Recording means for performing recording on a recording medium.

Further, in the recording apparatus, the first conversion means performs a deshuffling process on the DIF stream in SD format from an input terminal conforming to IEEE 1394 to convert the DIF stream into video data in SD format of a digital VCR. Recording device.

In the recording apparatus, the second converting means performs image decompression processing of the video data of the first format in the SD format of the digital VCR and converts the video data into a video component signal of the SD format. apparatus.

Further, in the recording device, the third conversion means performs an image compression process on the digital VCR in the SDL format of the digital VCR to convert the video component signal into video data in the SDL format.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording apparatus according to an embodiment of the present invention will be described below with reference to FIG. In the present embodiment, a case where a DIF stream in the SD format of a digital VCR is recorded will be described as an example.

First, the configuration and operation of the recording apparatus will be described with reference to FIG. 101 is a digital signal input terminal,
102, a digital interface circuit conforming to IEEE 1394; 103, a video data selection switch;
4 is an error correction coding processing circuit, 105 is a recording modulation processing circuit, 106 is a magnetic tape, 107 is an image expansion processing circuit that expands an image according to the SD format of a digital VCR, and 108 is output video data with an expanded image to a monitor. Image output processing circuit for converting to an image format that can be
9 is an output terminal for outputting video data to a monitor, 110
Is an image conversion circuit for performing image compression according to the SDL format of the digital VCR.

Next, the operation will be described. Input terminal 10
1 is inputted to a digital interface circuit 102 conforming to IEEE 1394, and the inputted digital signal is converted into a D signal of SD format.
In the case of an IF stream, the data is converted into SD format video data by performing a deshuffling process. The converted video data is supplied to a video data selection switch 103.
And input to the image decompression processing circuit 107.

The video data input to the image decompression processing circuit 107 is subjected to image decompression according to the SD format, and is converted into a video component signal in the SD format. The converted video component signal is sent to the image output processing circuit 108 and the image conversion circuit 110.

The video component signal input to the image output processing circuit 108 is converted into video data in an image format that can be output to a monitor, and is output from an output terminal 109 to the monitor. By outputting the video data to the monitor, the recording process can be performed while checking the image of the input DIF stream.

The video component signal input to the image conversion circuit 110 is subjected to image compression according to the SDL format, and is converted into video data of a predetermined image format. The data amount is reduced to half by performing image compression in the SDL format. The converted video data is input to the video data selection switch 103.

In the video data selection switch 103, the video data converted by the digital interface circuit 102 is sent to the error correction coding processing circuit 104 when performing high-quality recording. The video data image-compressed by the image conversion circuit 110 is sent to the error correction coding processing circuit 104.

The error correction code processing circuit 104 adds an error correction code, and then the recording modulation processing circuit 10
5, and after the modulation processing for recording is performed,
It is recorded on a magnetic tape 106 for a digital VCR.

As described above, according to the embodiment of the present invention, the input digital signal is converted into a format having a smaller amount of data than the input format and then recorded, so that recording is performed for a long time. Becomes possible.

In a digital VCR, SD
The DIF stream of the format is output to the monitor after performing the image expansion of the SD format, and the video data after the image expansion is subjected to the image compression of the SDL format and then recorded, thereby enabling long-time recording. Further, the digital VCR uses a recording / reproducing system of the SD format and a recording / reproducing system of the SDL format of a normal digital VCR, and can record for a long time with a simple configuration simply by adding a selection switch.

As described above, according to the embodiment of the present invention, the digital image signal of the SD format input to the input terminal of the recording apparatus is subjected to various data conversions, and the SD format of the digital VCR is converted. In addition to the recording, the video data can be recorded as video data in the SDL format, and is also converted into a video component signal in the SD format for monitoring.

[0031]

As described above, according to the recording apparatus of the present invention, the input digital signal is converted into a format having a smaller amount of data than the input format, and then recorded, whereby the recording is performed. Time recording becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a recording apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a system configuration of a conventional recording apparatus.

FIG. 3 is an image diagram of a recording pattern on an SD format magnetic tape.

FIG. 4 is an image diagram of a recording pattern on an SDL format magnetic tape.

FIG. 5 is a diagram showing a format of an NTSC digital interface.

FIG. 6 is a diagram showing a transmission format of a digital interface.

FIG. 7 is a diagram showing a DIF packet in SD format.

FIG. 8 is a diagram illustrating a DIF packet in the SDL format.

[Explanation of symbols]

Reference Signs List 101 input terminal 102 IEEE 1394 digital interface circuit 103 switch 104 error correction coding processing circuit 105 recording modulation processing circuit 106 magnetic tape 107 image decompression processing circuit 108 image output processing circuit 109 output terminal 110 image conversion circuit 201 input terminal 202 IEEE 1394 compliant Digital interface circuit 203 Error correction coding processing circuit 204 Recording modulation processing circuit 205 Magnetic tape 206 Image decompression processing circuit 207 Image output processing circuit 208 Output terminal

Claims (5)

[Claims] 1. A recording apparatus for recording a digitized video signal, comprising: first conversion means for converting a digital image signal input from an input terminal into video data of a first format; A second converting means for converting the video data obtained in the above into video data in a second format; and converting the video data obtained in the second converting means into the first format.
A third converting means for converting the video data into a third format of video data having a smaller data amount than the video data of the third format; and the video data obtained by the first converting means and the third
Recording means for selecting any one of the video data obtained by the converting means and recording the selected video data on a recording medium. 2. The recording apparatus according to claim 1, wherein the first conversion unit is configured to output a standard definition (SD) signal from an input terminal conforming to IEEE1394.
Ion) format DIF (Digital In)
A recording apparatus for performing a deshuffling process on a stream to convert the stream into video data in a digital VCR SD format. 3. The recording apparatus according to claim 1, wherein said second conversion means performs image decompression processing on the video data of the first format in an SD format of a digital VCR to convert the video data in an SD format. A recording device for converting into a video component signal. 4. The recording apparatus according to claim 1, wherein the third conversion means converts the video component signal into an SDL (Standard D) of a digital VCR.
definition High Compression
n) Perform image compression processing in the format, and
A recording device for converting into video data of a format. 5. The recording apparatus according to claim 1, wherein said recording means is capable of recording video data in a digital VCR SD format or SDL format.