JP2002369144A - Disk image signal recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk image signal recording method in which a broadcast program on a different channel is recordable simultaneously. SOLUTION: In an image signal recorder for encoding an image signal in units of frame to record it on a disk, the image signal recorder is constituted of N pieces of CH frame memories 251 to 25N, a frame memory 29 and an encoder 30. In the N pieces of CH frame memories 251 to 25N, when the image signal of N channels (CH) is simultaneously recorded, the signals obtained by A/D-converting the image signal of the NCH are stored, respectively, and a pixel relating to a frame image of a frame signal of each CH stored is subjected to thinning 1/m, and a line is subjected to thinning 1/n (m, n are a natural numeric in which N=m×n is 2 or more), and a decreased image decrease frame signal is generated to output it. In the frame memory 29, each image decrease frame signal output from the N pieces of CH frame memory is stored in a region divided for the image decrease frame signal. In the encoder 30, an output of the frame memory is encoded and the output is supplied to the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk video signal recording device, and more particularly to a disk video signal recording device capable of simultaneously recording a plurality of input video signals.

[0002]

2. Description of the Related Art In addition to video data (V) encoded in MPEG2 format and audio data encoded in MPEG or Dolby Digital or audio data (A) in linear PCM, digital video discs in DVD-Video format include: , Subtitle data (SP) for displaying captions, navigation data (NAVI) for controlling the playback order of the players, and the like are recorded.

In this format, only one sequence ID is allowed for video. Meanwhile, 2
According to the MPEG standard, a plurality of video sources can be handled theoretically if one video source is divided into sequence IDs. However, in practice, the maximum transfer rate of media cannot be exceeded.

MPEG-1 is 352 for NTSC.
× 240 / field pixel size, MPEG-
2 is a pixel size of 704 × 480 / frame. Therefore, since MPEG-2 is at a level four times as large as the field of MPEG-1, MPEG-2
If the image has a level of -1, it is possible to simultaneously input four types of image signals.

[0005] For example, it is easy to obtain two streams in non-real time, such as in the angle reproduction of DVD-Video, by the conventional technique. For simultaneous recording of a program, two or more encoders (encoders) must be prepared, and a plurality of streams must be appropriately multiplexed when writing to a disk.

[0006]

A digital video disk recorder using a recordable DVD disk basically has a single stream ID because it inherits the DVD-Video format. However, due to the nature of the recorder, even if the image quality is somewhat sacrificed as a product function, a simultaneous recording function for, for example, a counter program is required. In addition, since it is a consumer device, the appearance of a disk video signal recording device capable of simultaneously recording a back program or the like by using only one encoder has been desired from the viewpoint of cost. Therefore, the present invention has been made in view of the above-described problem, and in particular, the present invention provides N
A / D converted signals of the input video signals of the channels are respectively stored, and the pixels related to the frame images of the stored frame signals of the respective channels are thinned to 1 / m pixels, and the pixels related to the frame images are stored. Lines (scanning lines) are thinned out, and the original image information is 1 / N (where m and n are natural numbers satisfying N = m × n satisfying 2 or more) lines, and 1 / N of the image information for each frame image N channel frame memories that generate and output reduced image reduced frame signals, respectively, and convert each image reduced frame signal output from the N channel frame memories into each of the N image reduced frame signals. And a frame memory for storing the whole as one frame signal by taking in each of the divided sub-regions according to a plurality of video signals. Signal, and to provide a program and simultaneously record it disc video signal recording apparatus a video signal of a plurality of programs of the off-screen program such as, for example, want to record.

[0007]

In order to solve the above-mentioned problems, the invention described in claim 1 is a disk video signal recording apparatus that encodes an input video signal on a frame basis and records it on a disk. A / D-converted signals of the N-channel input video signals supplied through the input paths are stored, and the pixels related to the frame image of the stored frame signal of each channel are thinned out to 1 / m
And the original image information is defined as 1 / n (where m and n are natural numbers where N = m × n satisfies 2 or more) by thinning out lines (scanning lines) related to the frame image. N channel frame memories 251 to 25N for generating and outputting image reduced frame signals reduced to 1 / N image information for each frame image, and image reduced frame signals output from the N channel frame memories Into each partial area divided according to each of the N image reduced frame signals, and stores the whole as one frame signal, and encodes the output signal of the frame memory in frame signal units. Encoder 30 for supplying the output to the disk
And a disk video signal recording apparatus for encoding an input video signal in frame units and recording the encoded video signal on a disk. In the two-channel input video signal supplied through independent input paths,
One field video signal of the odd and even fields related to the input video signal of one channel and one field video signal of the odd and even fields related to the input video signal of the other channel are respectively assigned to the one field video signal. A frame memory 43 for storing in each of the field partial areas correspondingly divided, and an encoder 44 for encoding an output signal of the frame memory and supplying the encoded signal to the disk. According to a third aspect of the present invention, there is provided a disk video signal recording apparatus, wherein the channel frame memory and the frame memory are replaced with a channel field memory and a field memory in the disk video signal recording apparatus according to the first aspect. Provided is a disk video signal recording device characterized in that .

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of a disk video signal recording apparatus according to the present invention. The recording operation of the block configuration of one embodiment of the disk video signal recording apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a disk video signal recording apparatus according to an embodiment of the present invention. One embodiment of the disk video signal recording apparatus of the present invention shown in FIG. 1 includes A / D converters (Ch1 to Ch4) 211 to 214 and channel frame memories (Ch1 Frame Mem to Ch4 Frame Mem) 251 to 25.
4. Frame memory 29, and an encoder (Encode) for supplying its output to recording disk 31
r) 30.

A description will be given of a case of a simultaneous recording mode in which video signals of a plurality of channels respectively input through independent input paths are simultaneously recorded. The embodiment of the disc video signal recording apparatus shown in FIG. 1 is a case of four channels of video signal inputs (Input) 111-114.
Four-channel video signals (Input) 111 to 114 supplied through independent input paths are digitized by independent A / D converters 211 to 214, respectively. The digitized four-channel video signals are divided into respective channel frame memories 251 to 251 in frame signal units.
254.

The synchronization signal of the four-channel video signal does not need to be synchronized until it is supplied to the frame memory described below. The frame signals stored in these channel frame memories 251 to 254 respectively are:
The data is transferred to a predetermined partial area for each input channel (Ch1 to Ch4) in the next frame memory 29.

At this time, in order to reduce the frame size to 1/4 of the frame size at the time of normal recording in correspondence with the number of recording channels of the video signal, each channel frame memory 251 to 254 stores The extracted signal is thinned out and output. That is, the signals (pixels, pixels) of horizontal lines (scanning lines) related to the frame image of the frame signal extracted from each of the channel frame memories 251 to 254 are thinned every other pixel to reduce it to 、. The vertical signal lines (scanning lines) for the image are also reduced to 1/2 by thinning every other line, and the image reduced frame signal obtained by reducing the frame size of each channel to 1/4 is To the frame memory 29.

The transfer of each image reduction frame signal to the next frame memory 29 is driven by a synchronization signal inside the encoder 30. Although the accuracy of the television synchronization signal is fairly high, not all input video signals are synchronized.

One of the input video signals (Input) 111 to 114 may be used as the internal common reference synchronization signal, or another synchronization signal unrelated to them may be used.

As described above, in the frame memory 29 shown in FIG. 1, the frame memory is divided for four image reduced frame signals, and each of the divided partial areas is
The transferred four-channel image reduction frame signals are stored and stored as one combined frame signal. The image relating to the synthesized frame signal has a different pattern for each quarter of the screen, and consequently the range of the motion vector value is narrow, so that the code amount is not so affected or reduced. In the direction.

The video obtained by combining the four channels of video into one frame in the frame memory 29 is supplied to the encoder 30 and encoded.

The signal encoded by the encoder 30 is 1
Recording disk 31 that can be recorded as one stream
Is recorded via a recording circuit (not shown).

As shown in FIG. 5, in this embodiment,
The size of the frame in the simultaneous recording mode is set to the horizontal line (scanning line) related to the frame image of the frame signal stored in the channel frame memory in the normal recording mode.
Pixel signal is thinned out to 1/2, and the vertical line (scanning line) of the frame image is thinned out to 1/2.

In this embodiment of the case of four channels, the size of the frame of each input signal of the four channels is set to 1/4 frame size, and each input signal of the four channels is synthesized by a frame memory. The combined output signal of the frame memory is supplied to the encoder 30, and the encoded signal is recorded on the recordable recording disk 31 as one stream.

Next, a case where the number of input channels is N will be described with reference to FIG. However, the number N of input channels is a natural number of 2 or more. One embodiment of the disk video signal recording device shown in FIG. 6 is an A / D converter (Ch
1 to ChN) 211 to 21N, channel frame memory (Ch1 Frame Mem to ChN Frame Mem) 251 to 25N,
It comprises a frame memory (Frame Memory) 29 and an encoder (Encoder) 30 for supplying its output to a recording disk 31.

In the case of N channels, similarly to the case of four channels, N-channel video signals (Input) 111 to 111N supplied through independent input paths are respectively converted by independent A / D converters 211 to 21N. Digitized. The digitized N-channel video signals are taken into the respective channel frame memories 251 to 25N in frame signal units.

The pixels of the horizontal line (scanning line) of the frame image corresponding to each channel frame signal stored in each channel frame memory of N channels are thinned out to 1 / m pixels, and the vertical of the frame image is The lines in the direction are thinned to form 1 / n lines, and 1 / (m) of the size of the frame image of each channel frame signal stored in each of the channel frame memories 251 to 25N.
The image reduction frame signal of N channels reduced to the size of (× n) is transferred to the next frame memory 29.

The transfer of each image reduction frame signal to the next frame memory 29 is driven by a synchronization signal inside the encoder 30. Note that m and n are N = m × n
Is a natural number satisfying 2 or more. Frame memory 29
In this example, the frame memory is divided into N image reduced frame signals, and the transferred N channel image reduced frame signals are stored in each of the divided partial areas and synthesized.
Is stored as one frame signal.

An output signal from the frame memory 29 obtained by synthesizing the N-channel signal into one frame is supplied to the encoder 30 for encoding. Even if the input is a signal of a plurality of N channels, the signal encoded by one encoder 30 is converted into one stream, for example, DV
Recording is performed on a recording disk 31 such as a D disk via a recording circuit (not shown). In this embodiment, the channel frame memories 251 to 25N and the frame memory 29
Is constructed using a frame memory. However, instead of the frame memory, this can be replaced with a field memory. As a result, an inexpensive memory having half the memory capacity is used, which contributes to a reduction in the cost of the device.

Next, the case of the normal recording mode for recording an input video (video) signal of one channel will be described. In the apparatus using the embodiment of the disk video signal recording apparatus of the present invention shown in FIGS. 1 and 6, for example, a one-channel video signal is supplied from a video input Input 111 and digitized by an independent A / D converter 211. Is done. In this case, other channels Input112, Input11
3, ... are not used.

The digitized signal is stored in a channel frame memory (Ch1 Frame Mem) 251 for each frame. The frame signal stored in the channel frame memory 251 is directly used as a frame memory (Fram).
e Memory) 29, and is stored using the entire area of the frame memory 29 where the areas are not divided into, for example, Ch1 to Ch4.

The frame signal output from the frame memory 29 is encoded by an encoder (Encoder) 30. The output signal of the encoder 30 is output as a single stream through a recording circuit (not shown).
It is recorded on a recording disk 31 such as a D disk. The frame memory 29 used in the normal recording mode is a frame memory used in relation to the simultaneous recording mode described above. In the normal recording mode, the output of the channel frame memory 25 is directly supplied to the encoder 30. The configuration may be such that the frame memory 29 is not used.

Next, the reproduction operation of the block configuration of the disc video signal reproducing apparatus corresponding to the disc video signal recording apparatus of the present invention will be described with reference to the drawings. FIG. 2 shows a block configuration of a disk video signal reproducing device corresponding to the disk video signal recording device of the present invention. 2 includes a decoder (Decoder) 33 for decoding a reproduction signal from a reproduction disk 32, a zoom command processing circuit 34, and a digest command processing circuit 35. I have.

In the disk video signal reproducing apparatus of FIG. 2, a signal from a reproduction disk 32 on which video signals of a plurality of channels such as TV programs recorded by the disk video signal recording apparatus of the present invention are read, For example, streams of four channels (Ch1 to Ch4) are decoded by the decoder (Decoder) 33. Generally MPE
The G decoder has several commands for trick play. In the example shown in FIG. 2, two display devices are shown.

One method uses a zoom command processing circuit 34. In the simultaneous reproduction mode for reproducing a recording disk on which four channels are simultaneously recorded, one method is used.
A channel at any position is selected from arbitrary positions Ch1 to Ch4 in the frame, cut out, enlarged, and displayed on the TV display device 36. In the case of the example of FIG. 2, the zoom command processing circuit 34 selects and cuts out one channel of the １ ／ screen to be reproduced and enlarges it.

Another method is to reproduce using the digest command processing circuit 35. This method is originally a method of simultaneously displaying the time lapse of one stream on a single screen. If this method and the selective cutout of the screen position are used, it is possible to simultaneously display a plurality of channels, for example, two channels Ch2 and Ch3 out of four channels. Although the above description has been made on the case of a disk on which signals of four channels are recorded, the same apparatus can cut out and reproduce the same manner when reproducing a disk on which N channels are recorded.

The disc video signal recording apparatus shown in FIG. 1 and the reproducing apparatus shown in FIG. 2 are integrated.
In the case of a disk video signal recording / reproducing device incorporated in a V device, a game device, or the like, the recording disk 31 and the reproducing disk 32 may be the same recording / reproducing disk.

A block configuration of another embodiment of the disk video signal recording apparatus according to the present invention is shown in FIG. Another embodiment of the disk video signal recording apparatus of the present invention shown in FIG. 3 is the A / D converters 41 and 42 and the frame memory (E).
ven Field, Oven Field) 43 and an MPEG video encoder 44 which encodes the output of the frame memory 43 and supplies it to the recording disk 45.
This recording apparatus selects and encodes one of the two different input video (video) signals (Ch1, Ch2) Input1, 2 in the even field and the odd field of the NTSC signal.

A selected one of the odd and even fields of the input video signal Input1 (Ch1), for example, an even field (Even)
Field) is A / D converted by the A / D converter 41 to be digitized, and a selected one of the input video signals Input2 (Ch2), for example, an odd field (Odd Field) is A / D converted by the A / D converter 42. Digitize. Each A /
The digitized signal A / D converted by the D converters 41 and 42 is divided into two in a single frame memory 43 in advance, and the corresponding even field (Even Fie
ld) and an odd field (Odd Field).

An output signal from the frame memory 43 in which a frame signal is formed by one selected field signal of two different video signals Ch1 and Ch2 is transmitted to the encoder 4
4

The video signals Ch1 and Ch2 to be selected are composed of odd fields and even fields, so that there is no need for field conversion and the efficiency is high. Needs to convert one to an even field or an odd field.

The output signal of the frame memory 43 is encoded by an encoder 44 to form one stream, which is recorded on a recording disk 45 such as a DVD disk via a recording circuit (not shown).

This method differs from the above-described embodiment in that the channel frame memory does not need to be used even when two video signals are recorded, just like the case where one video signal is recorded. Two different video signals can be encoded by one encoder 44 and recorded as one stream on the recording disk 45.

However, when the MPEG encoder 44 that uses the correlation of the fields for motion detection is used,
Generally, the contents of the video signal Ch1 and the video signal Ch2 are irrelevant. In such a case, the change per field is large, the code amount increases, and the image quality deteriorates.

FIG. 4 shows a block diagram of a disk video signal reproducing apparatus corresponding to another embodiment of the disk video signal recording apparatus of the present invention. The disc video signal reproducing apparatus shown in FIG. 4 decodes a signal reproduced from the reproducing disc 46 by using an MPEG video decoder (MPEG Video Deck).
oder) 47 and a field selector 48 for outputting a signal to the TV image display device 49.

An MPEG decoder 47 decodes a reproduction signal from a reproduction disk 46 on which a plurality of video signals such as TV programs recorded by the disk video signal recording apparatus of the present invention are recorded. The signal decoded by the MPEG decoder 47 is supplied to a field selector 48, and the field selector 48 selects the desired one of the odd field and the even field.

The field selector 48 generates the other unrecorded field based on any one of the selected odd and even fields, and
Generate a playback frame signal. The generated reproduction frame signal is supplied to the TV display device 49 to display a desired video signal.

It should be noted that, in the case of a device which is integrated with the disk video signal recording device shown in FIG. 3 and the disk video signal reproducing device shown in FIG. And the reproduction disk 46 may be the same recording and reproduction disk.

[0044]

As described above, according to the first aspect of the present invention, the A / D-converted signals of the N-channel input video signals supplied through the independent input paths are stored, respectively. Pixels related to the frame image of the stored frame signal of each channel are thinned to 1 / m pixels, and lines related to the frame image are thinned to 1 / m.
the original image information as 1 line for each frame image
/ N image frame signals generated and output as image reduced frame signals reduced to / N image information, respectively, and each image reduced frame signal output from the N channel frame memories is converted into the N image reduced frame signals. It has a frame memory that takes in each partial area divided according to each of the frame signals and stores the whole as one frame signal, so that a single encoder can control a plurality of video signals, for example, a program to be recorded and its Video signals of a plurality of programs such as counter programs can be simultaneously recorded. Further, since a plurality of video signals can be recorded by one encoder, the image quality is deteriorated as compared with the case of recording by providing a plurality of encoders, but simultaneous recording can be realized at low cost.

According to a second aspect of the present invention, of the two-channel input video signals supplied through the independent input paths, one of the odd-even field fields related to the input video signal of one channel is used. A frame memory for storing a signal and one field video signal of an odd-even field related to the input video signal of the other channel in each field partial area divided corresponding to each of the one field video signal. Therefore, two video signals, for example, a program to be recorded and a video signal of a program behind it can be simultaneously recorded by one encoder. Further, it is not necessary to add a frame memory or the like, and simultaneous recording can be realized at a low cost with a simple configuration.

Further, the invention described in claim 3 is a disk video signal recording apparatus in which the frame memory portion of the invention described in claim 1 is replaced with a field memory, respectively, so that an inexpensive field memory is used. With this configuration, the cost of the disk video signal recording device can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a block configuration (in the case of simultaneous recording of four channels) of an embodiment of a disk video signal recording apparatus of the present invention.

FIG. 2 is a diagram showing a block configuration of a disk video signal reproducing device corresponding to one embodiment of the disk video signal recording device of the present invention.

FIG. 3 is a diagram showing a block configuration of another embodiment of the disk video signal recording device of the present invention.

FIG. 4 is a diagram showing a block configuration of a disc video signal reproducing apparatus corresponding to another embodiment of the disc video signal recording apparatus of the present invention.

FIG. 5 is a diagram schematically showing a frame size of a disc video signal recording apparatus according to the present invention in a case of normal recording and a case of simultaneous recording.

FIG. 6 is a diagram showing a block configuration (in the case of simultaneous recording of N channels) of an embodiment of the disk video signal recording apparatus of the present invention.

[Explanation of symbols]

111-11N Input video (channel) signal 211-21N A / D converter 251-25N Channel frame memory 29 Synthesized frame memory 30 MPEG video encoder (encoder) 31, 45 Recording disk 32, 46 Playback disk 33 Decoder (Decoder) 34) Zoom command processing circuit 35 Digest command processing circuit 36 TV image display device in case of zoom command 37 TV image display device in case of digest command 41 A / of video input signal Input1 (Ch1) D converter 42 A / D converter for video input signal Input1 (Ch2) 43 Frame memory with odd / even field configuration 44 MPEG video encoder 47 MPEG video decoder 48 field selector 49 TV image display device Number of channels of input video signal (N = m × n is a natural number satisfying 2 or more) m Number of horizontal divisions of frame (m × n is a natural number satisfying 2 or more) n Number of vertical divisions of frame (m × n) Is a natural number that satisfies 2 or more)

Claims (3)

[Claims] 1. A disk video signal recording apparatus which encodes an input video signal on a frame basis and records the encoded video signal on a disk, wherein a signal obtained by A / D converting N-channel input video signals supplied through independent input paths, respectively. Each of them is stored, the pixels related to the frame image of the stored frame signal of each channel are thinned out to 1 / m pixels, and the lines (scanning lines) related to the frame image are thinned out to 1 / n.
(Where m and n are natural numbers where N = m × n satisfies 2 or more) lines, and image reduced frame signals are generated by reducing the original image information to 1 / N image information for each frame image. N channel frame memories to be output, and the respective image reduced frame signals output from the N channel frame memories are fetched into respective partial areas divided according to each of the N image reduced frame signals, and Characterized by comprising: a frame memory that stores a frame signal as one frame signal; and an encoder that encodes an output signal of the frame memory in frame signal units and supplies the output to the disk. Signal recording device. 2. A disk video signal recording apparatus which encodes an input video signal on a frame basis and records the encoded video signal on a disk, wherein an input video of one of two channels of input video signals supplied through independent input paths. One field video signal of the odd-even field related to the signal and one field video signal of the odd-even field related to the input video signal of the other channel, each of which is divided corresponding to each of the one field video signal. A disk video signal recording device, comprising: a frame memory for storing in a field partial area; and an encoder for encoding an output signal of the frame memory and supplying the output to the disk. 3. The disk video signal recording apparatus according to claim 1, wherein the channel frame memory and the frame memory are replaced with a channel field memory and a field memory.