JPH07107435A - Optical disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a high definition television signal by decoding each read encoded data by a standard television signal decoding means and a local decoding means used in an encoding means. CONSTITUTION:One read encoded data string is subjected to decoding processing in the same manner as conventional, and the other is inputted to the local decoding means surrounded with a long and short dash alternating line and is processed. An adder 107 in each decoding processing outputs decoded data X1 of odd numbered fields and decoded data Xr of even numbered fields to a frame synthesizing circuit 118. The circuit 118 transposes data X1 and data Xr with respect to time to output the picture data in one frame period of the high definition television signal to a second selector 111. At the time of reproducing the high detinition television signal, the selector 111 selects the signal in the high level and outputs it to an output terminal. Thus, the circuit scale is not extended or the cost is not raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording for reproducing a high-definition television signal or the like which has been encoded with high efficiency in an optical disc recording / reproducing apparatus for highly efficiently encoding and recording a standard television signal. Reproduction device

[0002]

2. Description of the Related Art Conventionally, an optical disk recording / reproducing apparatus has been proposed which performs data compression coding using a frame or field correlation of a digital image signal and records / reproduces on / from an optical disk. One example thereof is shown in FIGS. The ones shown are generally known. 3 is a block diagram of the recording device, and FIG. 4 is a block diagram of the reproducing device.

In FIGS. 3 and 4, 101 is a subtractor, 1
Reference numeral 02 is an orthogonal transformer represented by DCT, 103 is a quantizer, 104 is a variable length encoder represented by Huffman coding, 105 is an inverse quantizer, 106 is an inverse orthogonal transformer, 107 is an adder, 108 is a frame memory,
109 is a predictor, 112 is a variable length decoder, 113 is a recording system signal processing circuit, 114 is a recording head, 115 is an optical disk, 116 is a reproducing head, and 117 is a reproducing system signal processing circuit. The operation of the conventional example will be described below with reference to the drawings.

First, the operation of the recording apparatus shown in FIG. 3 will be described. In FIG. 3, a digital image signal that has been divided into blocks each including a plurality of pixels is input to an input terminal 100 after the time axis is rearranged. The rearrangement of the time axis is performed according to the prediction structure between frames.
For example, an example of a prediction structure between frames is schematically shown in FIG.

In FIG. 2, (1), (2), and (3) show one frame of the image signal. The arrow indicates that the frame of (1) is encoded within the frame and the frame of (2) is (1). ) And (3) frames are predicted and coded,
The frame (3) indicates that the frame is predicted and encoded from the frame (1). The same applies to decryption.
The temporal flow of the image signal is a flow of (1) → (2) → (3) frames, but at this time, the image signal is temporally (1) → (3) → ( 2) The data is rearranged and input in the order of frames. This rearrangement is performed using, for example, a frame memory.

The subtractor 101 is provided for each of the digital image signals X _o included in the above-described block.
From the image signal X _p predicted by the predictor 109 that performs motion compensation for each block, and the prediction error signal E =
X _o −X _p is output to the orthogonal transformer 102. Orthogonal transformer 1
02 orthogonally transforms the prediction error signal E for each block and outputs it to the quantizer 103. The quantizer 103 quantizes the orthogonally transformed signal and outputs the quantized signal Q to the variable-length encoder 104 and the inverse quantizer 105.

The variable length encoder 104 encodes the quantized signal Q and outputs the encoded data string to the recording system signal processing circuit 113.
Output to. The recording-system signal processing circuit 113 performs processing necessary for recording on the optical disk 115, such as buffering of a variable-length encoded data string, addition of error detection / correction code, digital modulation, signal amplification, and the like, via the recording head 114. A digital code string is recorded on the optical disc 115.

On the other hand, the inverse quantizer 105 outputs the quantized signal Q
The inversely quantized signal is output to the inverse orthogonal transformer 106.
The inverse orthogonal transformer 106 performs the inverse orthogonal transformation for each block.
And outputs it to the adder 107. The adder 107
The signal obtained by the orthogonal transformer 106 and one frame before
Prediction signal X_pAnd are added, and the locally decoded signal X_lThe frame
Output to Molly 108. This locally decoded signal X_lIs
After being stored in the frame memory 108 for a predetermined period, the predictor
It is input to 109. The predictor 109 is new for each block.
Motion-compensated prediction signal X_pSubtractor 101 and
Output to the adder 107. In fact, the predictor 109
Block using frame, current frame, and back frame
Each motion vector is detected, and this motion vector and local
Decoded signal X _lMotion compensation of the current frame based on
ing.

Next, the reproducing apparatus will be described with reference to FIG. In FIG. 4, from the optical disk 115 to the reproducing head 1
A digital code string is transmitted via 16 to a reproduction system signal processing circuit 1
17 is input. In terms of time, the frame numbers are input in the order of (1) → (3) → (2) shown in FIG. The digital code string is subjected to signal amplification, digital demodulation, error detection / correction processing, and other processing in the reproduction system signal processing circuit 117, is then decoded in the variable length decoder 112, and is inversed in the inverse quantizer 105. Quantized inverse orthogonal transformer 1
The inverse orthogonal transform is performed at 06.

The adder 107 adds the signal obtained by the inverse orthogonal transformer 106 and the prediction signal X _q one frame before, and outputs the decoded signal X _r to the output terminal 119 and the frame memory 108. The decoded signal X _r is input to the predictor 109 after being stored in the frame memory 108 for a predetermined period such as one frame period or two frame periods. The predictor 109 outputs the motion-compensated prediction signal X _q newly for each block to the adder 107. Basically the reproduction side structure is similar to the local decoding section on the recording side, X _p = X _q, is X _l = X _r.

[0011]

However, with the above-mentioned conventional structure, it is only possible to record and reproduce a high efficiency encoded standard television signal, and a standard television signal such as a high definition television signal. In order to handle a signal having a larger amount of data than that, a similar circuit having a larger circuit scale for that purpose is required, which has a drawback that the circuit scale or the cost is significantly increased.

In view of the above, the present invention provides a standard television such as a high-definition television signal in a device for highly efficiently encoding a standard television signal and recording / reproducing it on an optical disc without a significant increase in circuit scale or cost. It is an object of the present invention to provide an optical disc recording / reproducing apparatus which can reproduce a signal having a larger amount of data than a John signal.

[0013]

SUMMARY OF THE INVENTION The present invention is an optical disc recording / reproducing apparatus for highly efficiently encoding a standard television signal to record / reproduce it on an optical disc, as compared with a standard television signal such as a high definition television signal. An optical disc in which digital image data of one frame period of a signal having a large amount of data is divided into two, and each is subjected to high-efficiency encoding, and then the encoded data is recorded by a recording mechanism of two channels in total for each channel. From the two channels, the coded data is read for each division unit, and each coded data is decoded by the standard television signal decoding means and the local decoding means used in the coding means. .

[0014]

According to the present invention, when a signal having a data amount larger than that of a standard television signal such as a high definition television signal divided into 2-channel encoded data is decoded, the standard television signal is decoded. Since this is performed using the means and the local decoding means, it is possible to reproduce a signal having a larger amount of data than a standard television signal such as a high definition television signal without significantly increasing the circuit scale or the cost.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an optical disk recording / reproducing apparatus according to an embodiment of the present invention. In this embodiment, as a signal having a larger amount of data than the standard television signal,
A signal having a data amount twice as much as the standard television signal in the vertical direction will be referred to as a high definition television signal, and the unit of division of the digital image data in one frame period of the signal will be described as a field unit. Further, although the recording mechanism describes only one channel, it is configured to record the high-efficiency encoded data for each field on the front surface and the back surface of the optical disc by two channels.

In FIG. 1, reference numerals 110 and 111 select a case where a standard television signal is highly efficiently encoded and recorded on an optical disc, and a case where a high efficiency encoded signal is reproduced at a high definition television signal recorded on an optical disc. It is the first and second selectors that do. In the case of reproducing a high-definition television signal recorded on an optical disc by high-efficiency coding 118, the decoded data of each field is temporally converted into the decoded data of one frame period of the high-definition television signal. This is a frame synthesizing circuit that rearranges, and is configured using, for example, a field memory and a selector. The remaining blocks are the same as those in FIGS. 3 and 4.

A detailed description will be given with reference to FIG. When a standard television signal is highly efficiently encoded and recorded / reproduced on / from an optical disc, the S side shown in FIG. 1 is selected as the first selector 110 and the second selector 111, respectively, and the conventional example is performed according to FIGS. 3 and 4. The same operation as described above is performed.

In the case of reproducing a high-definition television signal recorded on an optical disc with high efficiency coding, the first
The selector 110 and the second selector 111 are selected on the H side shown in FIG. Optical disk 115
Is divided into two, a high-definition television signal in one frame period, into image data of an odd field composed of odd-numbered lines and image data of an even field composed of even-numbered lines. Encoded data sequences which are highly efficient encoded as image data corresponding to one frame of a standard television signal are recorded on the front surface and the rear surface, respectively, for each unit.

The encoded data string is read from each surface of the optical disk 115 via the reproducing head 116, and one (eg, even field) encoded data string is subjected to the decoding process in the same manner as the conventional one, and the other. One (for example, an odd field) encoded data string is a reproduction system signal processing circuit 1
17. After being processed by the variable length decoder 112, it is selected by the first selector 110, input to the local decoding means (the part indicated by the alternate long and short dash line in FIG. 1) used in the encoding means, and processed. .

Adder 10 in each decoding process
7 outputs the odd field decoded data X _l and the even field decoded data X _r to the frame synthesis circuit 118. The frame synthesizing circuit 118 temporally rearranges the decoded data X _l of the odd field and the decoded data X _r of the even field to transfer the image data of one frame period of the high definition television signal to the second selector 111. Output. When reproducing the high definition television signal, the second selector 111 selects the H-side signal shown in FIG. 1 and outputs it to the output terminal 119.

As described above, in this embodiment, in the optical disc recording / reproducing apparatus for recording and reproducing the standard television signal with high efficiency by using the local decoding means as the encoding means, the high definition television signal An optical disc in which image data of one frame period is divided into two for each field, the image data of each field is highly efficiently encoded as image data corresponding to one frame of a standard television signal, and then recorded by a two-channel recording mechanism. From 2
The encoded data is read by the channel reproduction mechanism, one encoded data is subjected to the decoding processing of the standard television signal, and the other encoded data is subjected to the decoding processing using the local decoding means. It is possible to reproduce the high definition television signal by rearranging the decoded data for each field, which has been subjected to the decoding process, in time so as to be image data of one frame period of the high definition television signal.

In this embodiment, as a signal having a larger data amount than that of the standard television signal, a signal having twice the data amount of the standard television signal in the vertical direction is defined as a high definition television signal, After dividing one frame period of a high definition television signal into two for each field,
The case has been described as an example where the high-efficiency coded data for each field is recorded on the front surface and the back surface of the optical disc by two channels, but the division unit can be set arbitrarily, for example, by subsampling. Good. Further, the recording area of the encoded data for each division unit on the optical disc may be divided into two.

A stereoscopic video signal composed of a video signal for the right eye and a video signal for the left eye may be used as the signal having a larger data amount than the standard television signal.

[0024]

As described above, according to the present invention, 2
When decoding a signal having a larger data amount than a standard television signal such as a high definition television signal divided into coded data of a channel, a decoding means and a local decoding means for the standard television signal are used. Therefore, by simply adding a reproducing head, a reproducing system signal processing circuit, a variable length decoder, and a selector to a conventional optical disk recording / reproducing apparatus, reproduction of a high definition television signal can be realized, and the circuit scale or the cost can be significantly increased. Does not occur.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing an example of a prediction structure between frames.

FIG. 3 is a block diagram of a conventional optical disk recording device.

FIG. 4 is a block diagram of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

 101 Subtractor 102 Orthogonal Transformer 103 Quantizer 104 Variable Length Encoder 105 Inverse Quantizer 106 Inverse Orthogonal Transformer 107 Adder 108 Frame Memory 109 Predictor 110 Selector 111 Selector 112 Variable Length Decoder 113 Recording System Signal Processing circuit 114 Recording head 115 Optical disc 116 Playback head 117 Playback system signal processing circuit 118 Frame synthesis circuit

Claims (3)

[Claims] 1. An optical disc recording / reproducing apparatus for highly efficiently encoding a standard television signal to record / reproduce on / from an optical disc, an encoding means for highly efficient encoding using a local decoding means, and an image more than the standard television signal. One of the signals with a lot of data
Divide the digital image data in the frame period into two,
Means for reading the coded data for each division unit from the optical disc recorded by the recording mechanism for two channels in total, that is, one channel for each division unit after high efficiency encoding. An optical disk recording / reproducing apparatus comprising: each of the coded data read by the two-channel reproducing mechanism, and a unit for decoding the standard television signal by a decoding unit and a local decoding unit used in the coding unit. 2. The optical disc recording / reproducing apparatus according to claim 1, wherein the signal having more image data than the standard television signal is a high definition television signal. 3. The optical disc recording / reproducing apparatus according to claim 1, wherein the signal having more image data than the standard television signal is a signal including a right-eye video signal and a left-eye video signal.