JP2000113593A - Digital audio disk encode device and digital audio disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record plural audio data which is high sampling-processed by various algorithms into a DVD audio disk so as to select high sampling audio data desired by a user at the time of reproducing. SOLUTION: A PCM audio signal, which is high bit-processed from 16 bits to 24 bits with a high bit processing circuit 2, is high sampling-processed by respectively different algorithms with high sampling processing circuits 31 to 3n, is thereafter formatted with a DVD audio formatting processing part 4 into a form which the user can retrieve at the time of reproducing, is further modulated with a modulation circuit 5 and is supplied to a disk cutting machine not shown in the figure. The disk cutting machine records the high sampling audio data, in which plural preparation algorithms are different and the management data for retrieving these data into the DVD audio disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DVD audio disk encoding apparatus for recording a plurality of high-sampling audio data, which are high-sampled by various algorithms, on a DVD audio disk, and a DVD for reproducing the DVD audio disk recorded by the apparatus.
The present invention relates to an audio disc reproducing device.

[0002]

2. Description of the Related Art Conventionally, in a CD or the like, a music source has two
It is recorded as channel audio data, and it has been considered that this audio data is enjoyed by being high-sampled so that the sound quality is remarkably improved. Hitherto, audio data such as CDs recorded at a standard sampling frequency has been sampled at a high sampling rate and played back. However, the playback apparatus becomes complicated and expensive, and processing only on the playback side is performed. Therefore, there was a certain limit in sound quality improvement.

Therefore, it is conceivable to record high-sampling audio data on a disk such as a CD and reproduce it. However, if high-sampling is performed at a higher frequency than standard frequency sampling, the amount of data becomes enormous, and if the storage capacity is the same, the playing time is reduced.

[0004] By the way, DVD which has begun to spread in recent years,
It has an enormous data recording capacity due to technologies such as two-layered recording layers. There is already a DVD video, and there is an increasing expectation to store the above-mentioned high-sampling audio data in a DVD audio disc that respects it and requires compatibility with it.

[0005]

Under the above trend, music data already recorded at a sampling frequency of 44.1 kHz (referred to as a standard sampling frequency) of two channels at 88.2 kHz, 176.2 kHz or 9
High sampling at 6 kHz and 192 kHz has been attempted in the past, but there is no definitive version, and it is difficult to determine at which frequency high sampling is appropriate or there is a preference by human beings. is there. Further, it is difficult to realize a reproducing apparatus that can be converted by any of the methods because it is costly or the algorithm is open to the public.

On the other hand, in the case of DVD audio, the storage capacity can be increased by increasing the number of recording layers of the disk as described above, and there is a demand for the effective use of the increased capacity. Therefore, there is a demand for development of a DVD audio disk encoding device and a DVD audio disk reproducing device that allow a user to enjoy high-sampling audio with good operability and that the device is not complicated and expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to perform high-sampling by various algorithms so that a user can select desired high-sampling audio data during reproduction. With a DVD audio disk encoding device capable of recording a plurality of audio data on a DVD audio disk and a simple and inexpensive configuration, a DVD audio disk on which the high sampling audio data is recorded can be reproduced with high operability and high sound quality. It is to provide a DVD audio disc reproducing apparatus capable of performing the above.

[0008]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is characterized by processing means for high-sampling an input audio signal by various algorithms to create a plurality of high-sampling audio data. ,
Formatting means for formatting the plurality of audio data created by the processing means so that the plurality of audio data can be recorded on a DVD audio disc and retrieving the plurality of audio data during reproduction; and modulating the audio data formatted by the formatting means. Modulation means.

According to the first aspect, a PCM audio signal created by sampling at a standard sampling frequency is subjected to high sampling by various algorithms which are distinguished by a difference in a method of widening a band or a difference in a sampling frequency. Then, a plurality of high-sampling audio data is created, and the high-sampling audio data is formatted to be searchable at the time of reproduction and recorded on a large-capacity DVD audio disk. This allows the user to select and play the desired high-sampling audio data without complicating the apparatus on the playback side, and without deciding on a standard such as a high-sampling algorithm on the manufacturer side. High-sampling audio data can be easily played and enjoyed.

According to a second aspect of the present invention, in the DVD audio disk encoding device according to the first aspect,
High-bit converting means for increasing the number of bits of the input audio signal is provided, and the high-bit converting means converts the audio signal to high bits and then performs high-sampling by the processing means.

According to the second aspect, for example,
Before high sampling a bit audio signal,
If the bit is set to a high bit of 24 bits, the sound quality during reproduction can be further improved.

According to a third aspect of the present invention, in the DVD audio disk encoding device according to the second aspect,
There is provided bit conversion means for reducing the bits of the audio data which have been high-sampled by the processing means to bits before the high-bit conversion.

According to the third aspect of the present invention, the audio data that has been converted to high bits to 24 bits and then high-sampled is reduced to the original 16 bits without substantially changing the quality of the data. Can be greatly saved.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In the DVD audio disk encoding device according to any one of the above, the various algorithms may include a difference in sampling frequency at the time of high sampling, or whether or not intentionally widening the bandwidth of the high sampling audio data is performed. It is to be distinguished by the difference between the methods and the difference made by combining them.

According to the fourth aspect, a difference in sampling frequency at the time of high sampling or a difference in a method of adding a high frequency range to widen a band causes a difference in sound quality at the time of reproduction. The meaning that is selected by comes out.

According to a fifth aspect of the present invention, a reproducing means for reading audio data and management data from a DVD audio disk by an optical pickup device, a decoding means for decoding the audio data read by the reproducing means, and a decoding means To convert a PCM audio signal obtained by decoding into an analog signal
/ A conversion means, search and display means for searching recorded high-sampling audio data based on the management data read by the playback means, and displaying the search information, and display means for displaying the search information. A selection unit for allowing a user to select high-sampling audio data to be reproduced according to the search information; and a reproduction control unit for causing the reproduction unit to reproduce the high-sampling audio data selected by the selection unit.

According to the fifth aspect of the present invention, since a plurality of high-sampling audio data having different creation algorithms are recorded on the DVD audio disk, the retrieval information of the high-sampling audio data is displayed at the time of reproduction to provide the user with the information. A desired high sampling audio data is selected, and the selected high sampling audio data is reproduced. For this reason, since high-sampling is not performed on the reproducing side, the desired high-sampling audio data can be easily reproduced and enjoyed with a simple and inexpensive reproducing apparatus.

According to a sixth aspect of the present invention, there is provided a DV having an audio data pack including audio data and a management pack including management data for managing data in the pack.
In the D audio disk, the audio data is created by high sampling by a plurality of different creation methods and includes each of them, and the management data can select any one of a plurality of high sampled data having different creation methods. It consists in comprising.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the DVD audio disk encoding device of the present invention. The DVD audio disk encoding device converts input PCM audio signals of input channels 1 and 2 for inputting PCM audio signals of two channels to 24.
A high-bit processing circuit 2 for converting a 24-bit audio signal into an 8-bit audio signal;
High sampling processing circuits 31 to 3n for performing high sampling processing at 8.2 kHz, high sampling processing circuit 3
A DVD audio formatting processing unit 4 for formatting audio data sampled by 1 to 3n; a modulation circuit 5 for modulating the formatted audio data to output to an output terminal 6; It has an interface 7 for inputting, an interface 8 for inputting character copyright information and the like, and a system controller 9 for controlling the operation of the entire apparatus.

Next, the operation of this embodiment will be described. 2-channel 16-bit PCM audio signal input from input terminal 1 (sampled at standard frequency)
Is converted into a 24-bit audio signal by the high-bit processing circuit 2 and then input to a plurality of high-sampling processing circuits 31 to 3n.

Here, there are a plurality of algorithms for high sampling. First, the first algorithm converts the normal sampling frequency by a factor of two, three, or a predetermined rate using a plurality of different generation methods, and is disclosed in Japanese Patent Application Laid-Open No. 6-61789. In this method, the sampling frequency changes without adding a high frequency component.

In the second algorithm, oversampling is performed as in the first algorithm, nonlinear processing for intentionally generating harmonics is performed, and then the high-frequency component is extracted. To form wideband audio information (e.g., Japanese Patent Laid-Open No. 7-236).
193).

In the third algorithm, oversampling is performed as in the first algorithm, and furthermore, nonlinear processing is performed by arithmetic processing to form harmonics and directly form wideband audio information (Japanese Patent Laid-Open No. 7-1995). 175478, JP-A-7-66687, and Japanese Patent Application No. 9-290135).

In the fourth algorithm, oversampling is performed as in the first algorithm, and further, a nonlinear processing is partially performed using a conversion table to form harmonics, thereby forming wideband speech information ( JP-A-5-12
7672).

In the fifth algorithm, interpolation is performed using a spline function, sampling is performed again along this curve, and the sampling frequency is increased while restoring the lost high-frequency component (Japanese Patent Laid-Open Nos. 5-7130 and 5-5130). −2521
19).

When audio data is high-sampled by these algorithms, there is a difference in sound quality obtained between them. In this embodiment, a plurality of audio data high-sampled by various algorithms are recorded on a DVD audio disk.

Therefore, the high sampling processing circuits 31 to 31
3n performs high-sampling of the audio signal by the above-described various algorithms. For example,
The high-sampling processing circuit 31 performs high-sampling processing using the first algorithm, the high-sampling processing circuit 32 performs high-sampling processing using the second algorithm, and so on.

The high-sampling processing circuits 31 to 3n high-sample the high-bit audio signal at 88.2 KHz by the above-described various methods and output the high-bit audio signal to the DVD audio formatting processing unit 4. The DVD audio formatting processing unit 4 formats the input various high sampling audio data in a structure as shown in FIG. The various formatted high-sampling audio data are modulated by the modulation circuit 5, and then supplied from an output terminal 6 to a cutting machine (not shown), and recorded on a DVD audio disc in accordance with the format.

Further, the audio signal, the video signal, and the character copyright information sampled at the standard frequency are also formatted by the DVD audio formatting processing section 4 and then modulated by the modulation circuit 5, and then output from the output terminal 6 (not shown). It is supplied to a cutting machine and recorded on a DVD audio disc according to the format.

FIG. 2 is a diagram showing the structure of formatting by the DVD audio formatting unit 4.
In this example, a TOC file having an audio title set (ATS) of DVD audio and a TOC is shown. ATS is n from ATS <1> to ATS <n>
Stores various types of audio data (songs) and stores them in A
It is configured to be managed by MG (Audio Manager).

That is, AMG,
AMGM (menu), A for storing audio data
TS <1>, ATS <2>... ATS <n>. Accordingly, the audio data sampled by the above-mentioned various methods are ATS <1>, ATS <2>, AT
<I>,... The AMG manages the plurality of audio data, and the AMGM manages a menu related to the plurality of audio data. Also, TO
The file C manages the number of pieces of music corresponding to the audio data stored on the disk, the playing time, and the like.

As a result, the management data of AMGM and TOC and the audio data stored in ATS <1>, ATS <2>... ATS <n> are recorded on the DVD audio disk. Any one of the audio data sampled by the algorithm can be easily searched and selected.

According to the present embodiment, audio data that has been sampled by a plurality of methods can be recorded on a DVD audio disc in a format that can be searched during reproduction. Moreover, since the configuration of the apparatus is simple as shown in the figure, the apparatus can be configured at a low cost, and high-sampled music and the like can be recorded at low cost on a DVD audio disk. Further, it is possible to provide a user with a DVD audio disc capable of performing various high-sampling reproduction during reproduction.

As will be described later, since a plurality of high-sampled audio data are recorded on a DVD audio disk in the above-described format, the reproducing side can select from the plurality of high-sampled audio data according to preference. It is sufficient to select and play any one, and it is possible to easily enjoy high-sampled music and the like without adding a complicated circuit or the like to the apparatus on the playback side.

FIG. 3 is a block diagram showing a second embodiment of the DVD audio disk encoding device of the present invention. However, portions corresponding to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. This example has substantially the same configuration as that of the first embodiment shown in FIG. 1, except that audio signals that have been converted to high bits by the high sampling processing circuits 31 to 3n are input to the bit conversion circuit 10 and the original bit signals are output. After the audio data is returned to 16-bit audio data, the DVD audio formatting unit 4 performs formatting.

The two-channel audio signal, which has been converted into a 24-bit high bit by the high-bit conversion circuit 2, is directly input to the bit conversion circuit 10 to restore the original 16-bit audio signal. By inputting the signal to the section 4, the original audio signal which is not subjected to high sampling can be recorded on the DVD audio disk.

The bit conversion by the bit conversion circuit 10 is performed by energy equivalent conversion (described in detail in Japanese Patent Application Laid-Open No. Hei 6-237182), and is converted into 16-bit audio data while maintaining almost the same quality as in the case of 24 bits. Can be converted.

Thus, in the present embodiment, since the DVD audio format processing section 4 and thereafter need only handle 16-bit audio data, the size of the subsequent circuit can be reduced, and the audio data of the DVD audio disc can be reduced. The storage capacity can be greatly reduced. Other effects are the same as those of the first embodiment shown in FIG.

FIG. 4 is a block diagram showing a third embodiment of the DVD audio disk encoding device of the present invention. However, portions corresponding to the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. This example is different from the first embodiment in that the sampling frequency at the time of high sampling of the high sampling processing circuits 41 to 4n differs depending on each circuit, and the other configuration is the same.

The high sampling processing circuit 41 is 88.2.
KHz, high sampling processing circuit 42 is 176.2K
Hz, high sampling processing circuit 4n is 192 KHz
Then, a process for converting audio data to high sampling is performed. At this time, it is assumed that any of the high sampling processing circuits employs the third algorithm described in the first embodiment. That is, the input audio signal is over-sampled, and further subjected to non-linear processing in arithmetic processing to form harmonics, thereby directly forming wideband audio information.

By inputting the two-channel audio signal, which has been converted into a 24-bit high bit by the high-bit conversion circuit 2, directly into the DVD audio format processing section 4, the high-bit converted audio signal is also recorded on the DVD audio disk. I can do it.

According to this embodiment, a plurality of high-sampling audio data can be created by changing the sampling frequency at the time of high-sampling processing, and can be formatted and recorded on a DVD audio disc. Even if the sampling frequency is changed,
The texture of the reproduced audio signal is different, and the user can select and enjoy music having a desired sampling frequency.
Other operations are the same as those of the first embodiment shown in FIG. 1, and have the same effects.

In the above embodiment, the high sampling method is fixed to the third algorithm in each of the high sampling processing circuits. However, by combining the sampling frequency at the time of the high sampling processing and the high sampling method, the number of the high sampling methods can be increased. High-sampling audio data having different textures can be created and recorded with the same configuration.

FIG. 5 is a block diagram showing one embodiment of the DVD audio disk reproducing apparatus of the present invention. D
The VD audio disc reproducing apparatus scans a DVD audio disc with an optical pickup and reads audio data and various data. A DVD reproducing section 51, a decoder section 52 for decoding reproduced audio data and converting it into a PCM audio signal, a PCM audio A channel separation circuit 53 for separating a channel from a signal; a D / A conversion circuit 54 for converting a PCM audio signal into an analog audio signal; a control unit 55 for performing various settings for reproducing an audio signal and controlling the above-described units; A display operation unit 56 for displaying data and inputting an instruction from a user is provided.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. DVD playback unit 51
When a DVD audio disk on which high-bit audio data is recorded by the DVD audio disk encoding device described above is set, the management data (TOC) portion is read out at step 601 in FIG. Is displayed on the LCD or the like of the display operation unit 56 by the control unit 55.

The display section displays a menu of title sets including information such as the titles and playing times of the set DVD audio discs, the type of high sampling and the sampling frequency. The user looks at this display, selects a desired music piece, the type of high sampling, and the like, and inputs them to the control unit 55 from the display operation unit 56.

The control unit 55 receives this, and proceeds to step 60.
, 60n, it is determined which high-sampling program is selected, and the process proceeds to any of the corresponding steps 703, 704,..., 70n, and proceeds to steps 603, 604,. Playing the selected audio data from the DVD audio disc;
This is decoded by the decoder 52.

Next, at step 800, the audio data decoded as described above is
After the channel separation in step 3, the data is converted into analog data by the D / A converter 54 and reproduced.

At the time of reproduction at step 800, the control unit 55 sets the sampling frequency of the reproduced audio data to D.
By setting the number of channels of the reproduced audio data in the channel separator 53 while setting the number of channels of the reproduced audio data in the D / A converter 54, the D / A converter 54 performs a D / A conversion operation corresponding to the sampling frequency of the reproduced audio data. Is controlled to be performed smoothly.

According to the present embodiment, since the DVD audio disc is recorded with audio data that has been sampled and recorded by a plurality of types of algorithms, the user simply selects a desired one among them.
You can enjoy high sampling audio data. In addition, since high sampling is not performed on the reproducing apparatus side, the reproducing apparatus may have a simple configuration, and the above effects can be obtained at low cost.

Also, since the audio data recorded on the DVD audio disc by being sampled by various algorithms at high sampling rate is reproduced, the difference in sound quality due to the difference between the algorithms can be enjoyed. Can be expected to significantly improve the sound quality.

In the DVD audio system composed of the DVD audio disk encoding device, the DVD audio disk and the DVD audio disk reproducing device, a plurality of audio data, which are high-sampled by various algorithms, are recorded on the DVD audio disk. Because it is a method of selecting and playing the favorite high-sampling audio data, there is no need to uniformly determine which high-sampling algorithm to use. You can enjoy. In this case, the amount of audio data is considerably large, but since the DVD audio disk has a large capacity, it can be realized without any problem.

In the above embodiment, the high-bit processing circuit has been described with the number of bits being 24 bits. However, the number of bits is not limited to 24 bits. It is needless to say that two channels may be created differently depending on the channel group, such as 20 bits.

[0054]

As described in detail above, the D of the present invention
According to the VD audio disk encoding device, a plurality of audio data that has been high-sampled by various algorithms can be recorded on a DVD audio disk so that a user can select desired high-sampling audio data during reproduction.

According to the DVD audio disk reproducing apparatus of the present invention, the DVD audio disk on which the high-sampling audio data is recorded can be reproduced with high operability and high sound quality with a simple and inexpensive configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a DVD audio disk encoding device of the present invention.

FIG. 2 is a diagram showing a structure of formatting by a DVD audio formatting processing circuit shown in FIG. 1;

FIG. 3 is a block diagram showing a second embodiment of the DVD audio disk encoding device of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the DVD audio disk encoding device of the present invention.

FIG. 5 is a block diagram showing one embodiment of a DVD audio disc reproducing apparatus of the present invention.

FIG. 6 is a flowchart showing a flow of the operation of the device shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input terminal 2 High-bit processing circuit 4 DVD audio formatting processing unit 5 Modulation circuit 6 Output terminal 7, 8 interface 9 System controller 10 Bit conversion circuit 31-3n, 41-4n High sampling processing circuit 51 DVD playback unit 52 Decoder unit 53 Channel separation circuit 54 D / A conversion circuit 55 Control unit 56 Display operation unit

Claims (3)

[Claims] 1. A processing means for high-sampling an input audio signal by various algorithms to create a plurality of high-sampling audio data, and a plurality of audio data created by the processing means can be recorded on a digital audio disk. A digital audio disc encoding device comprising: a formatter for formatting the plurality of audio data so that the plurality of audio data can be searched at the time of reproduction; and a modulator for modulating the audio data formatted by the formatter. 2. A digital audio disc having an audio data pack including audio data and a management pack including management data for managing data in the pack, wherein the audio data is created by high sampling by a plurality of different creation methods. A digital audio disc comprising: a plurality of high-sampled data, wherein the management data is different from the plurality of high-sampled data; 3. A digital audio disc having an audio data pack including audio data and a management pack including management data for managing data in the pack, wherein the audio data increases the number of bits of an input audio signal. A digital audio disc, wherein each of the digital audio discs is formed by a high bit, and the high bit data is formatted into a predetermined data array, and the formatted audio data is modulated.