KR100299985B1 - Dvd, audio signal encoding device and dvd reproducing device - Google Patents

Abstract

PURPOSE: A DVD, an audio signal encoding device and a DVD reproducing device are provided to overcome the limit of a recording capacity, and simultaneously record and reproduce different audio signals with high quality. CONSTITUTION: A DVD stores basic audio data and extended audio data corresponding to the basic audio data in at least one or more audio streams corresponding to certain titles separately, wherein additional data relating to the extended audio data is stored in the audio stream descriptor, and the expanded audio data is data obtained by compressing and encoding differential signals between the basic audio data and audio data providing improved audio quality better than the basic audio data. An audio signal encoding device includes an audio compression encoding unit and a multiplexing unit for encoding audio signals of different quality into proper signals to record to the DVD.

Description

Digital multi-function disc (DVD), audio signal encoding device and DVD player

The present invention relates to a digital multi-functional disc (DVD), an audio signal encoding apparatus, and a DVD playback apparatus. More particularly, the present invention relates to a DVD which simultaneously provides high quality audio signals with high efficiency to at least one audio stream region of a DVD, An audio signal encoding apparatus for receiving audio signals of different qualities and encoding them into a signal suitable for recording on the DVD described above, and a DVD player for selectively and selectively playing back the audio signals recorded on the DVD described above.

The compact disc (CD) is widely used as an audio recording medium for the general public, and a digital versatile disc (DVD) audio format is being discussed. DVD-Audio, which is currently discussed, is intended to provide high quality audio signals by high sampling, high bit, and multichannel. However, the technology for providing a high quality audio signal in a portable DVD audio device has not been greatly improved.

Conventional CDs record uncompressed audio signals in 44.1 KHz 16 bit 2 channels, and recording time is about 74 minutes. DVD, a new recording medium since the mid-1990s, can record up to 8 audio streams, and records about 300 minutes at 48KHz 16-bit and 120 minutes at 96KHz 24-bit on a 12cm disc. Have In addition, a DVD has a recording time of about 2/5 of the recording time of a 12cm disc on an 8cm disc.

Meanwhile, the conventional audio signal encoding apparatus of a CD can encode only one audio signal among audio signals having different qualities received into a signal suitable for recording on a CD. In addition, a CD cannot record two different quality audio signals in one disc with sufficient recording time due to the limitation of the CD recording method and recording capacity. In the conventional CD player, a single audio signal recorded on a disc is read as it is and reproduced.

According to the conventional DVD-video format, 'DVD-Video' is divided into a video data area, a sub-picture data area, a navigation data area and an audio data area, and has a total data capacity of 4.7 / 8.5G bytes and Video, sub-picture and audio are split between 10.08Mbps and up to 6Mbps. The video data area of this DVD-Video stores compressed data by MPEG-1 / MPEG-2 video encoding method. The audio data area includes linear pulse code modulation (LPCM), AC-3, MPEG- 2, up to eight audio data streams are stored according to methods such as digital theater system (DTS) and sony digital dynamic sound (SDDS).

A conventional DVD audio signal encoding apparatus encodes a plurality of received audio signals into a signal suitable for a plurality of audio streams supported by the DVD-Video standard, and the plurality of audio streams exist independently of each other. Therefore, the DVD player according to the conventional DVD-Video standard decodes the video data recorded on the DVD-Video, restores it to a moving picture, converts it to be displayed, and decodes the audio data to convert it into an analog audio signal. . When the audio data processed by the linear PCM method is used for such DVD-Video, the best sound quality can be provided. However, when the linear PCM method is used, DVD-Video can service two channels of quantized audio data at 96KHz sampling frequency and 24bit quantization bits, 48KHz sampling frequency and 16bit quantization bits 8 channels can be provided for the quantized audio data, but no sampling frequency or number of channels can be used.

In addition, a pack structure of a linear PCM for a conventional audio signal is composed of a pack header added at the start of the pack, a packet header following the pack header, and a frame unit following the packet header. It consists of real audio data of linear PCM method. This pack stores only the audio data encoded by linear PCM method, and each frame is divided by the number of data only because each frame of the real audio data area does not have a separate frame header and stores a certain sample number of linear PCM data. This is possible.

However, the recording and reproducing apparatus of the conventional CD has a problem in that it is impossible to simultaneously provide different high quality audio signals due to limitations such as the recording / reproducing method and recording capacity of the CD.

In addition, since a plurality of audio streams according to the conventional DVD-video standard are encoded and recorded independently of each other, it is difficult to efficiently combine the plurality of audio streams with each other to simultaneously provide better quality audio signals. In particular, portable 8cm discs on DVD have insufficient recording capacity to simultaneously record / play back audio signals with different high quality, and still record capacity to simultaneously record / play 96KHz / 192KHz high-quality audio signals even on a typical 12cm disc. This lacks the problem.

On the other hand, the DVD-audio recording and reproducing system employing the DVD-video format requiring frame-by-frame access has been processed in the conventional linear PCM method which can distinguish each frame only by the number of data as described above. There is a problem that it is difficult to process the signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital multifunctional disc (DVD) having a data format capable of simultaneously recording and playing back a plurality of audio signals having different audio qualities with sufficient recording time while maintaining high quality. have.

Another object of the present invention for solving the above problems is to simultaneously record and play back a plurality of audio signals having different audio quality with sufficient recording time while maintaining high quality, and to process the above-mentioned audio signals by frame The present invention provides a digital multifunctional disc having an efficient data format.

Another object of the present invention for solving the above problems is to provide an audio signal encoding apparatus for encoding a plurality of audio signals having different qualities received into signals suitable for recording on the aforementioned digital multifunctional disc.

Another object of the present invention for solving the above problems is to provide a DVD playback apparatus capable of selectively and simultaneously playing back the audio signals contained in the above-mentioned digital multifunctional disc.

1 is a diagram showing the structure of an audio stream attribute table corresponding to an arbitrary title according to an embodiment of the present invention;

2 is a diagram illustrating a structure of an extended audio stream for recording extended audio data, according to an embodiment of the present invention;

3 illustrates a structure of an audio stream including basic audio data and extended audio data according to another embodiment of the present invention;

4 is a block diagram showing each configuration of an audio signal encoding apparatus according to the present invention;

FIG. 5 is a detailed configuration diagram showing an embodiment of the multiplexer shown in FIG. 4;

6 is a block diagram showing each configuration of a DVD player according to the present invention;

FIG. 7 is a detailed configuration diagram showing an embodiment of the demultiplexer shown in FIG.

<Description of the symbols for the main parts of the drawings>

40: audio compression encoding means 40a: digital filter

40b: Subtractor 40c: Extended Audio Encoder

41: basic audio encoder 42: multiplexer

42a: first packet header addition portion 42b: second packet header addition portion

42c: pack header addition portion 61: reading means

62: demultiplexer 62a: pack separation unit

62b: packet separator 62c: basic audio data buffer

62d: Extended Audio Data Buffer 63: Basic Audio Encoder

64: audio quality enhancer 64a: digital filter

64b: Extended Audio Encoder 64c: Adder

65: selective output means 65a: selective control unit

65b: selector

Digital multi-functional disc (DVD) for achieving the object of the present invention described above, the extended audio data corresponding to the basic audio data and the basic audio data to at least one or more audio streams among a plurality of audio streams corresponding to any title Are stored separately from each other, and additional data related to the extended audio data is stored in an audio stream attribute of a title set. Here, the extended audio data may be data obtained by compressing and encoding difference data between the aforementioned basic audio data and audio data providing an improved audio quality than the basic audio data.

According to another aspect of the present invention, an audio signal encoding apparatus obtains a differential signal between a received first audio signal and a second audio signal exceeding audio quality of the first audio signal, and compresses and encodes the obtained differential signal. Audio compression encoding means for outputting; And define the received first audio signal as basic audio data, and define the compressed coded differential signal from the audio compression encoding means as the extended audio data, and multiplex the basic audio data and the extended audio data into a preset format. And multiplexing means for outputting.

According to another aspect of the present invention, a DVD playback apparatus distinguishes basic audio data and extended audio data corresponding to basic audio data from at least one audio stream among a plurality of audio streams corresponding to an arbitrary title. And additional data related to the extended audio data are stored in the audio stream attribute of the title set, and the above-mentioned extended audio data is differential data between the aforementioned basic audio data and audio data providing improved audio quality than the basic audio data. Digital multi-function disk (DVD) characterized in that the compressed and encoded data; Reading means for reading data recorded from the above-described DVD; Demultiplexing means for receiving the data stream read by the above-described reading means to detect additional data, and separately outputting the basic audio data and the extended audio data based on the detected additional data; An audio quality enhancer for receiving and signal-processing the basic audio data and the extended audio data from the demultiplexing means and restoring the audio signal having an improved audio quality than the audio signal by the basic audio data; And selective output means for selectively outputting one of a basic audio signal by basic audio data from the aforementioned demultiplexing means, and an audio signal having an improved audio quality than the basic audio signal from the aforementioned audio quality enhancing device. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First of all, the present invention provides a digital multi-function having " extended audio data " for improving audio quality by basic audio data of a DVD-video format in a plurality of audio stream regions used for supporting multiple languages in a DVD-video format. Suggest a disk. The extended audio data is data obtained by compressing and encoding difference data between the basic audio data described above and the audio data providing an improved audio quality than the basic audio data.

In a preferred embodiment of the digital multi-functional disc proposed by the present invention, the above-described basic audio data is stored in a specific audio stream among a plurality of audio streams corresponding to an arbitrary title, and the above-mentioned extended audio data is stored in the remaining audio stream. And additional data stored in at least one of the audio streams, which makes it possible to identify the extended audio data.

The aforementioned basic audio data is generally recorded by one-point stereo recording or multi-point stero recording, and is a stereo recorded audio signal suitable for speaker reproduction. The basic audio data is encoded and recorded in a linear PCM (Linear PCM) method that provides high sound quality, and may be encoded and recorded in various coding methods as shown in Table 1 below. The extended audio data described above is audio data obtained by compressing and encoding a differential signal between a stereo recorded audio signal and a binaural recorded audio signal contained in the basic audio data. Here, the binaural recorded audio signal is an audio signal suitable for headphone playback and provides a very good sound quality and sound field compared to the stereo recorded audio signal by being recorded at the position of two ears of a person. This extended audio data is a modified audio signal for a binaural recorded audio signal. As a result, the basic audio data can be played by itself. However, the extended audio data can be played by itself and must be played in combination with the basic audio data. Therefore, it should be specified that this extended audio data is extended audio data that is dependent on the basic audio data contained in the specific audio stream. As a method for this, an audio stream attribute table corresponding to each of a plurality of audio streams corresponding to an arbitrary title is used.

The first method defines a new "extension audio stream" in the audio coding mode of the audio stream attribute table to indicate that the audio stream is an extension audio stream, and the DVD player detects this information and It is determined that the extended audio stream of is an extended audio stream that is dependent on the previously located primary audio stream. The second method is to define a new "audio extension" in the "modified audio type" of the audio stream attribute table to be described later to specify that the audio stream is an extended audio stream, and to specify a special code ( In the first 3 bits of the specific code, specify the number of the base audio stream corresponding to the current extended audio stream. If "audio extension" is specified for the audio type, the audio coding mode is ignored. The third method designates additional data related to the extended audio stream as the second method in the audio application mode and special code of the audio stream attribute.

Referring to FIG. 1, an audio stream attribute (AST_ATR) table corresponding to each of a plurality of audio streams corresponding to an arbitrary title includes audio coding mode, multichannel extension, audio type, audio application mode, quantization / DRC, and sampling frequency ( f _s ), spare area, number of channels, special code and so on.

In more detail, first, information related to an audio coding mode recorded in b23 to b21 is shown in Table 1 below.

b23 to b21 Audio coding mode 000b Dolby AC-3 010b MPEG-1 or MPEG-2 without Extended Bitstream 011b MPEG-2 with Extended Bitstream 100b Linear PCM audio 110b DTS (optional) 111b SDDS (optional) others Spare

b20 is an area in which information related to multichannel extension is recorded. When 0b is recorded, b20 means that the multichannel extension function is not selected. When bb is recorded, b20 means that the multichannel extension function is performed.

Audio types of b19 to b18 are shown in Table 2 below.

b19 to b18 Modified audio type 00b Not specified 01b With language 10b Audio extension others Spare

When 10b is recorded in the audio type in Table 2, it can be seen that the current audio stream attribute and the corresponding audio stream are extended audio streams.

Information related to the audio application mode recorded in b17 to 16 is shown in Table 3 below.

b17 to b16 Audio application mode 00b Not specified 01b Karaoke Mode 10b Surround 11b Spare

b15 to b14 are areas in which information related to quantization (dynamic range control) is recorded. If the audio coding mode is "000b", "110b", or "111b", "11b" is recorded. If the audio coding mode is "010b" or "011b", quantization information is defined as follows.

00b: Dynamic range control data does not exist in MPEG audio stream

01b: Dynamic range control data exists in MPEG audio stream

10b, 11b: spare

If the audio coding mode is 100b, the quantization information is stored as shown in Table 4 below.

b15-b14 Quantization / DRC 00b 16 bit 01b 20 bit 10b 24-bit 11b Spare

B13 to b12 representing the sampling frequency fs are shown in Table 5 below.

b13-b12 fs 00b 48KHz 01b 96KHz 10b Spare 11b Spare

B10 to b8 representing the number of audio channels are shown in Table 6 below.

b10-b8 Number of audio channels 000b 1ch (mono) 001b 2ch (stereo) 010b 3ch (multi channel) 011b 4ch (multi channel) 100b 5ch (multi channel) 101b 6ch (multi channel) 110b 7ch (multi channel) 111b 8ch (multi channel)

B7 to b0 representing the special code are language codes if the above-described audio type is 01b, and if the audio type is 10b, the address of the basic audio stream to which the current extended audio stream attribute and the corresponding extended audio stream are combined is 3 of b7 to b5. Stored in bits.

Meanwhile, the attributes of the audio stream are defined by the above-described audio stream property table of FIG. 1 and the structure and contents of the extended audio stream containing extended audio data for an audio signal of improved quality than the basic audio data will be described with reference to FIG. 2. Explain.

Referring to FIG. 2, an extended audio stream for extended audio data according to a preferred embodiment of the digital multifunctional disc proposed by the present invention includes one extended audio stream header, a common audio data area, and an actual data area. It has N frames that contain extended audio data.

This extended audio stream header has information indicating the number of channels and channel headers as many as the number of channels. Each channel header includes information such as channel number, coding mode, usage, number of quantization bits, and sampling frequency of the corresponding channel. Each channel number is composed of 4 bits and may represent up to 16 channels of " 0000b to 1111b. &Quot; The coding mode contains coding mode information of 4 bits for extended audio data, and coding modes shown in Table 7 below can be used.

Extended Audio Coding Mode 0000 LPCM 0001 DTS 0010 Bitstream coding 0011 Lossless coding 0100 ADPCM 0101 8 bit 8fs others Spare

The usage area has a value of 3 bits, and when extended audio data is used, it indicates the use of extended audio data recorded in a frame of a corresponding channel. A value of "0" indicates that the extended audio data is a bit extension of the basic audio data. If the value of the usage is "1", it indicates that the data is for band extension in which the sampling frequency of the extended audio data is different from that of the basic audio data. If the value of use is "10", it means that the data for band extension in which the sampling frequency of the extended audio data and the sampling frequency of the basic audio data are the same. If the value of the use is "11", the extended audio data is a channel extension of the basic audio data, and indicates that cross-correlation processing with the basic audio channel is required for reproduction. If the usage value is "100", the basic audio channel and the extended audio channel are simply added and played. If the value of the usage is "101" newly added according to one embodiment of the digital multi-function disc of the present invention, this extended audio stream is decoded to simply add to the basic audio data. Table 8 below summarizes the values of these usage areas.

Modified usage 000b Bit extension 001b Simple bandwidth extension 010b Frequency Shifted Bandwidth Expansion 011b Channel Expansion Using Cross-Correlation 100b Simple channel extension 101b Simple addition others Spare

The number of quantization bits of the channel header of the extended audio stream is 5 bits, and the meanings of the values are shown in Table 9 below.

Quantization bits 00000 Meaningless (if data compression encoding is used) 00001 to 01000 1 to 8 bits 10000-11000 16 to 24 bits others Spare

The sampling frequency of the extended audio channel header is represented by 4 bits, and the meanings of the values are shown in Table 10 below.

Sampling frequency 0000 48KHz 0001 96KHz 0010 192KHz 0011 384KHz (8 fs) 0100 3.072 MHz (64 fs) 0101 44.1KHz 0110 88.2KHz 0111 176.4KHz 1000 2.8224 MHz others Spare

The common data area is an area for recording common data, and stores digital filter coefficients when digitally filtering basic audio data received when encoding an audio signal. In addition, the extended audio stream shown in FIG. 2 has a plurality of frames, which are areas for storing actual extended audio data for an audio signal beyond the audio quality provided by the basic audio data. Each of the frames has a channel number, a data length expressed in bytes, and areas for storing actual data corresponding to each channel number.

An example of recording extended audio data, which is data obtained by compressing and encoding a differential signal between a binaural recorded audio signal and a stereo recorded audio signal, as an extended audio stream shown in FIG. The difference signal between the stereo audio signal recorded by LPCM in two channels and the sampling frequency of 88.2KHz and the binaural recorded audio signal in two channels is compressed and stored as extended audio data by lossless coding. If so, the value of each channel header is recorded as shown in Table 11 below.

Channel number Coding mode purpose of use Number of bits Sampling frequency (fs) 0000 0011 101 00000 0110 0001 0011 101 00000 0110

In Table 11, the extended audio data corresponding to the channel numbers 1 and 2 are decoded by the lossless encoding method according to the coding mode and additional data related to the usage purpose detected at the time of reproduction, and the decoded extended audio data is decoded by the aforementioned basic audio data. By simple addition to the original binaural recorded audio signal is restored.

According to another preferred embodiment of the digital multi-functional disc proposed by the present invention, among a plurality of audio streams corresponding to an arbitrary title, a specific audio stream separately stores basic audio data and extended audio data corresponding to the basic audio data. And additional data for identifying the specific audio stream as an audio stream including basic audio data and extended audio data is stored in the audio stream attribute.

The value of this additional data can be stored as " 101b " in the audio coding mode of the audio stream attribute table having the structure shown in Fig. 1 when the basic audio data is an audio signal encoded by the linear PCM method. The value "101b" of the additional data is defined as "Linear PCM Audio with Extension". Therefore, when the DVD playback apparatus detects the aforementioned additional data "101b" in the audio stream attribute table in the input audio stream, the audio stream corresponding to this audio stream attribute has basic audio data and extended audio data of the linear PCM method. It is determined that the audio stream is v.

Referring to FIG. 3, an audio stream including the aforementioned basic audio data and extended audio data includes an audio stream header pack, N common data packs, and M audio data packs. This audio stream header pack has information relating to the entire audio stream and includes coding modes of extended audio data, bit rates, number of taps of digital filters, precision, coefficients of packs storing coefficients of digital filters, and the like. The common data pack stores information including a digital filter coefficient when the basic audio data is digitally filtered during encoding. Accordingly, the DVD-audio reproducing apparatus analyzes the audio stream header pack and the common data packs in the above-mentioned audio stream and initializes the audio decoder according to the detected information.

The audio data pack in which the basic audio data and the extended audio data are stored separately from each other includes at least one pack header and two packets in which the basic audio data and the extended audio data corresponding to the basic audio data are stored separately from each other. It has one or more packet pairs. Each packet pair has a first packet for basic audio data and a second packet for extended audio data described above. The first packet includes at least one frame in which a packet header including additional data (for example, stream ID) for identifying a packet for basic audio data and actual basic audio data are divided and stored in units of frames. It has a real basic audio data area with The second packet includes a packet header including additional data for identifying the packet for extended audio data corresponding to the first packet, and the actual extended audio data corresponding to the basic audio data of the first packet is framed. It is divided and stored as and has an actual extended audio data area having the same number of frames as the number of frames of the first packet.

According to a preferred embodiment of the present invention, the stereo packet is recorded in frame units in the first packet, and the stereo packet and binaural recorded audio signal correspond to the first packet in the second packet. Audio data obtained by compressing and encoding the difference signal is recorded in units of frames. Therefore, the DVD-audio reproducing apparatus detects the additional audio data which makes it possible to identify the basic audio data and the extended audio data contained in each packet header and reproduces only the first packet to obtain a stereo recorded audio signal. Decode and add to the first packet to obtain a binaural recorded audio signal. In the DVD-audio reproducing apparatus, since each packet described above is constituted in units of frames, the frame unit can be easily accessed, and the first and second packets can be easily synchronized. In other words, accessing only the first packet containing the linearly recorded audio signal of the linear PCM method ensures that a second packet containing the encoded differential data for the binaurally recorded audio signal is followed by the DVD-audio playback. The device only needs to access basic audio data, and no separate synchronization processing for extended audio data is required.

4 to 5, an audio signal encoding apparatus for recording audio signals of different qualities received on a DVD having the format method shown in FIGS. 1 to 3 will be described. FIG. 4 shows basic audio data and basic audio data having two different audio signals having different audio qualities. The difference signals of the two audio signals are converted into compressed audio data into a preset DVD-format. Each configuration of the multiplexed audio signal encoding apparatus is shown. The audio signal encoding apparatus of FIG. 4 receives a stereo recorded first audio signal input in synchronization with each other and a binaural recorded second audio signal exceeding the quality of the stereo recorded audio signal. Here, the received two audio signals are audio signals encoded in the same manner, and the encoding scheme is mainly a linear PCM scheme that provides high quality audio quality. The audio compression encoding means 40 of FIG. 4 obtains a difference signal between two audio signals received, and compresses the obtained difference signal in a predetermined manner.

More specifically, the audio compression encoding means 40 has a subtractor 40b and an extended audio encoder 40c connected to the output end of the subtractor 40b. The subtractor 40b subtracts the first audio signal from the received second audio signal and outputs the obtained differential audio signal. The extended audio encoder 40c compresses and encodes the difference signal from the subtractor 40b according to a predetermined coding scheme. Here, the extended audio encoder 40c compresses and encodes the received differential signal using a digital theater system (DTS) of a psychoacoustic coding method that provides high sound quality, and a lossless coding method.

On the other hand, the audio compression encoding means 40 may further include a digital filter 40a as an option. The digital filter 40a converts the frequency and phase of the received first audio signal into a signal similar to the frequency and phase of the second audio signal, and outputs the same to the subtractor 40b. In this case, the digital filter 40a preferably uses a head related transfer function (HRTF) filter, and the frequency and phase of the first audio signal are similar to the frequency and phase of the second audio signal using a predetermined filter coefficient. In this way, higher compression efficiency can be achieved. When the digital filter 40a is used, the filter coefficient is stored in the common data area of the audio stream shown in Figs. 2 and 3 described above.

The multiplexer 42 of FIG. 4 defines the received first audio signal as basic audio data and defines the encoded differential audio signal from the audio compression encoding means 40 as extended audio data. And extended audio data are multiplexed into a predetermined format and output as an audio stream. In this case, the audio stream includes additional data defining the attributes of the audio stream, and additional data for reproducing the basic audio data and the extended audio data. In addition, a time stamp TS for synchronizing two audio data may be recorded in the data pack. Meanwhile, the audio signal encoding apparatus of FIG. 4 may further include a basic audio encoder 41 for encoding the first audio signal received by a predetermined encoding method and supplying the same to the multiplexer 42.

FIG. 5 is a detailed configuration diagram of the multiplexer 42 shown in FIG. 4, and multiplexes the received basic audio data and extended audio data into the audio stream corresponding to FIG. The first packet header adding unit 42a of the multiplexer 42 shown in FIG. 5 receives basic audio data in frame units and adds a first packet header to each start position of the basic audio data composed of at least one frame. Output as a first packet for basic audio data. The second packet header adder 42b receives extended audio data in units of frames and adds a second packet header to each start position of the extended audio data composed of at least one or more frames, thereby serving as a second packet for the extended audio data. Output The pack header adding portion 42c constitutes a packet pair configured such that the first packet from the first packet header adding portion 42a precedes the second packet from the second packet header adding portion 42b, and includes at least one or more packets. A pack header is added to each start position of a data sequence composed of packet pairs to output a multiplexed pack audio stream.

FIG. 6 is a block diagram showing each structure of a DVD player for reproducing audio signals recorded according to embodiments of the digital multifunctional disc (DVD) proposed in the present invention. And one of the binaurally recorded audio signals in which the basic audio data and the extended audio data are combined.

Referring to Fig. 6, the reading means 61 reads out the data recorded on the above-mentioned DVD. The reading means 61 includes a mechanism and pickup unit (not shown) and a servo and RF / ECC unit (not shown). The mechanism and pickup unit (not shown) performs a function of reading data recorded on the DVD. The servo and RF / ECC unit (not shown) performs various servo functions for controlling the driving of the mechanism and pickup unit (not shown) under the control of the system controller (not shown), and also from the mechanism and pickup unit (not shown). Performs error analysis and error correction of the output data. The servo and RF / ECC unit (not shown) includes an error correction circuit (ECC) for error analysis and correction.

The demultiplexer 62 detects additional data in the data stream read by the reading means 61, and outputs the basic audio data and the extended audio data separately based on the detected additional data.

Referring to FIG. 7, which shows a detailed configuration diagram of a demultiplexer 62 for demultiplexing a specific audio stream including basic audio data and extended audio data, the demultiplexer 62 is added to the audio stream header and the common data area. The audio decoder can be initialized by detecting the received information and supplying it to an audio decoding controller not shown. In addition, the pack separator 62a shown in FIG. 6 detects a pack header added for each start position of a pack in which the basic audio data and the extended audio data are divided and stored in the audio stream divided by the pack unit. Outputs the remaining pack unit data. The packet separator 62b detects the packet header from the remaining pack unit data from which the pack header from the pack separator 62a is removed, and adds to the additional data for identifying the basic audio data and the extended audio data included in the packet header. Therefore, basic audio data and extended audio data are divided and output in packet units. The basic audio data buffer 62c stores the basic audio data of the packet unit from the packet separator 62b and outputs the basic audio data of the frame unit. The extended audio data buffer 62d stores the extended audio data in units of packets from the packet separation unit 62b and outputs the extended audio data in units of frames.

The audio quality enhancer 64 processes the basic audio data and the extended audio data from the demultiplexer 62 according to the additional data for the detected reproduction to improve the audio quality than the audio signal by the basic audio data. Restore to the signal. The extended audio decoder 64b provided in the audio quality enhancer 64 decodes the extended audio data from the demultiplexer 62 described above according to the detected coding mode to expand the encoded extended audio data. The adder 64c adds the extended extended audio data from the extended audio decoder 64b to the basic audio data from the demultiplexer 62 described above to restore the enhanced audio signal beyond the audio quality by the basic audio data. In addition, the digital filter 64a, which is further provided as an option in the audio quality enhancer 64, digitally filters the basic audio data from the demultiplexer 62 according to the detected digital filter coefficient and outputs it to the adder 64c.

The selective output means 65 is provided in the audio signal from the audio quality enhancer 64, which has an improved audio quality than the basic audio signal by the basic audio data from the demultiplexer 62 and the audio signal by the basic audio data. Optionally print one out. The selection control unit 65a provided in the selection output means 65 selectively outputs one of two audio signals received by the selection output means 65 according to a user's selection command through a user interface (not shown). Control signal is supplied to the selector 65b. The selector 65a selects and outputs one of the two audio signals described above according to the selection control signal supplied from the selection control unit 65a. In addition, the basic audio decoder 63 further provided as an option in the DVD player of FIG. 6 decodes the basic audio data from the demultiplexer 62 according to the detected coding mode to improve the audio quality enhancer 64 and the selective output. Supply to means (65).

Meanwhile, the headphone / speaker detector (not shown) further included in the DVD player of FIG. 6 includes a headphone sensor installed in the headphone terminal and a speaker sensor installed in the speaker terminal to automatically detect whether the headphone / speaker is used and detect the same. According to the signal, the selection control unit 65a may supply the above-described selection control signal to the selector 65b, or only one of the headphone sensor and the speaker sensor may be provided to generate the above-mentioned selection control signal.

As described above, a DVD according to the present invention corresponds to basic audio data for an audio signal stereo recorded in at least one or more audio streams among a plurality of audio streams corresponding to an arbitrary title, and corresponding stereo audio data. By separately recording the compressed audio signal and the differential audio signal of the binaural recorded audio signal, the compressed and expanded audio data are distinguished from each other, thereby overcoming the limitation of the recording capacity and efficiently providing high quality audio signals simultaneously.

In addition, the DVD according to the present invention stores the aforementioned basic audio data and extended audio data separately in a specific audio stream among a plurality of audio streams, and configures the actual audio data into packets separated by frame units. By enabling unit access, and having respective packet pairs for basic audio data and extended audio data, it has the effect of facilitating synchronization and access between the two audio data.

In addition, the audio signal encoding apparatus according to the present invention encodes the received stereo recorded audio signal and the binaural recorded audio signal into a signal suitable for recording on the above-mentioned DVD, thereby efficiently converting high quality audio signals to the DVD simultaneously. Can record The DVD player according to the present invention selectively reproduces the basic audio data and the extended audio data recorded on the DVD according to a predetermined method, and selects one of a stereo recorded audio signal and a binaural recorded audio signal. Provides the effect of making it admirable.

Claims (26)

Among the plurality of audio streams corresponding to an arbitrary title, basic audio data and extended audio data corresponding to the basic audio data are separately stored in at least one audio stream, and additional data related to the extended audio data is stored in the title set. Stored in the audio stream properties, And the extended audio data is data obtained by compressing and encoding difference data between the basic audio data and audio data providing an improved audio quality than the basic audio data. The digital multifunctional disc of claim 1, wherein the basic audio data is stereo recorded audio data, and the audio data providing an improved audio quality than the basic audio data is binaural recorded audio data. The method of claim 1, wherein the basic audio data is stored in a specific audio stream of the audio streams, the extended audio data is stored in at least one or more audio streams of the remaining audio streams, and the additional data is extended. Digital multifunction disc, additional data that allows audio data to be identified. The method of claim 3, wherein the identification information of the primary audio stream corresponding to the extended audio stream is further stored in the audio stream property, And said extended audio stream is an audio stream for extended audio data, and said basic audio stream is an audio stream for basic audio data. The method of claim 3, wherein the extended audio stream for the extended audio data is A digital multifunctional disc containing actual audio data of extended audio data corresponding to basic audio data and additional data for reproduction of the actual audio data. The method of claim 3, wherein the extended audio stream for the extended audio data is It has an extended audio stream header, a common data area, and an actual audio data area consisting of a plurality of frames containing extended audio data. The extended audio stream header includes a number of channels, a sampling frequency of actual audio data, and a plurality of channel headers. Each channel header is a region including a channel number, a coding mode, a usage, a number of quantization bits, and a sampling frequency. The common data area includes a digital filter coefficient when the basic audio data is digitally filtered during encoding, and the actual audio data area includes a plurality of channel numbers, a data length corresponding to each of the plurality of channel numbers, and a specified length thereof. This area contains audio data of And the usage area is an area including additional data for adding the extended audio data contained in the extended audio stream to the basic audio data contained in the basic audio stream. The method of claim 1, wherein a particular audio stream of the audio streams is Basic audio data and extended audio data corresponding to the basic audio data are stored separately from each other, and the additional data is additional data for identifying the specific audio stream as an audio stream including basic audio data and extended audio data. Digital multifunctional disc. 8. The method of claim 7, wherein the specific audio stream for the basic audio data and extended audio data is And digital audio data comprising actual audio data of basic audio data, actual audio data of extended audio data corresponding to the basic audio data, and additional data for reproducing the actual audio data. 8. The method of claim 7, wherein the specific audio stream for the basic audio data and extended audio data is An audio stream header area containing information related to the entire audio stream, at least one common data area storing digital filter coefficients, and real audio data of basic audio data and extended audio data corresponding to the basic audio data are distinguished from each other. And a digital multifunction disc comprising at least one audio data area to be stored. The method of claim 9, wherein the audio stream header area, each common data area, and each audio data area included in the specific audio stream are divided into pack units. Each pack for the audio data region includes a pack header and at least one packet pair for basic audio data and extended audio data, Wherein each packet pair includes a first packet for basic audio data and a second packet for extended audio data adjacent to the first packet and corresponding to the basic audio data of the first packet. 11. The apparatus of claim 10, wherein the first packet and the second packet each have a packet header and an actual audio data area which are distinguished from each other. The packet header corresponding to the first packet includes additional data for identifying basic audio data, and the actual audio data area corresponding to the packet header stores actual basic audio data for at least one frame unit, The packet header corresponding to the second packet includes additional data for identifying the extended audio data, and the actual audio data area corresponding to the packet header stores actual extended audio data for at least one frame unit. Digital multifunctional disc. An apparatus for receiving audio signals of different qualities and encoding them into signals suitable for recording on a digital multi-functional disc (DVD), Audio compression encoding means for obtaining a differential signal between the received first audio signal and the second audio signal exceeding audio quality of the first audio signal, and compressing and encoding the obtained differential signal; And The received first audio signal is defined as basic audio data, and the compressed encoded differential signal from the audio compression encoding means is defined as extended audio data, and the basic audio data and the extended audio data are multiplexed in a predetermined format and output. An audio signal encoding apparatus comprising multiplexing means. The apparatus of claim 12, wherein the first audio signal is a stereo recorded audio signal, and the second audio signal is a binaural recorded audio signal. 13. The audio compression encoding means according to claim 12, A subtractor for subtracting the first audio signal from each of the second audio signals received; And And an extended audio encoder for compressing and encoding the difference signal from the subtractor. 15. The audio signal encoding apparatus of claim 14, wherein the audio compression encoding unit further comprises a digital filter converting the received first audio signal into a signal similar to the second audio signal and outputting the same to a subtractor. The method of claim 12, wherein the multiplexing means A first packet header adder configured to add a first packet header to a start position of a first audio signal including at least one received frame and output the first packet header as a first packet; A second packet header adder configured to add a second packet header for each start position of the compressed encoded differential signal from the audio compression encoding means, the second packet header adder comprising at least one frame and outputting the second packet header; And Forming a packet pair so that a first packet from the first packet header portion is preceded by a second packet from the second packet header portion, and for each start position of a data sequence consisting of at least one or more of the packet pairs A pack header adder which adds a pack header and outputs it as an audio stream, And the first packet is defined as a packet for basic audio data, and the second packet is defined as a packet for extended audio data corresponding to the basic audio data. In the playback apparatus for playing a digital multi-functional disc (DVD), Among the plurality of audio streams corresponding to an arbitrary title, basic audio data and extended audio data corresponding to the basic audio data are separately stored in at least one audio stream, and additional data related to the extended audio data is stored in the title set. Stored in the audio stream properties, The extended audio data is a digital multifunctional disc (DVD) which is data obtained by compressing and encoding difference data between the basic audio data and audio data providing an improved audio quality than the basic audio data; Reading means for reading data recorded from the DVD; Demultiplexing means for receiving the data stream read by the reading means to detect additional data, and separately outputting the basic audio data and the extended audio data based on the detected additional data; An audio quality enhancer for receiving and signal-processing basic audio data and extended audio data from the demultiplexing means and restoring an audio signal having an improved audio quality than the audio signal by the basic audio data; And And a selective output means for selectively outputting one of a basic audio signal based on basic audio data from said demultiplexing means and an audio signal having an improved audio quality than the basic audio signal from said audio quality enhancing device. . 18. The apparatus of claim 17, wherein the demultiplexing means If the additional data related to the extended audio data included in the audio stream attribute in the data stream from the data reading means is detected and the detected additional data is the additional data for identifying the extended audio data, the basic audio data is based on this. DVD playback apparatus for distinguishing the basic audio stream and the extended audio stream for extended audio data for. 19. The apparatus of claim 18, wherein the demultiplexing means And identification information of the basic audio stream corresponding to the extended audio stream included in the audio stream attribute, and discriminating the basic audio stream corresponding to the current extended audio stream based on the detected identification information. 18. The apparatus of claim 17, wherein the demultiplexing means Detecting additional data included in the audio stream attribute in the data stream from the data reading means, and identifying that the detected additional data is the audio stream corresponding to the audio stream attribute is an audio stream including basic audio data and extended audio data. If the additional data to enable the additional audio data and the additional audio data to make it possible to identify each of the additional audio data, DVD playback apparatus for detecting the additional audio data and the extended audio data based on this. 21. The apparatus of claim 20, wherein the demultiplexing means A pack separator for detecting a pack header from among input data streams divided by pack units from the reading unit and outputting the remaining pack unit data from which the pack header is removed; Packet headers are detected among the remaining pack unit data from which the pack header is removed from the pack separator, and each packet is classified according to additional data included in the detected packet header and identifying basic audio data and extended audio data. A packet separator for outputting the separated audio data for each packet as basic audio data and extended audio data, respectively; And A first buffer which stores basic audio data for each packet from the packet separator and outputs basic audio data for each frame unit, and expands audio data for each packet from the packet separator and outputs extended audio data for each frame unit DVD player comprising an output unit having a second buffer. 18. The method of claim 17, wherein the audio quality enhancer is An extended audio decoder for decoding the extended audio data from the demultiplexing means and outputting the extended extended audio data; And And an adder for adding extended audio data extended from said extended audio decoder to basic audio data from said demultiplexing means. 23. The DVD player according to claim 22, wherein said audio quality enhancer further comprises a digital filter for digitally filtering basic audio data from the demultiplexing means and supplying it to an adder. 18. The DVD player according to claim 17, wherein the basic audio data stored in the digital multifunctional disc is stereo recorded audio data, and the audio data providing an improved audio quality than the basic audio data is binaural recorded audio data. 18. The apparatus of claim 17, wherein the basic audio data stored in the digital multifunctional disc is stored in a specific audio stream of the audio streams, and the extended audio data is stored in at least one or more audio streams of the remaining audio streams. And the additional data is additional data for identifying extended audio data. 18. The method of claim 17, wherein the particular audio stream of the audio streams stored on the digital multifunction disc is Basic audio data and extended audio data corresponding to the basic audio data are stored separately from each other, and the additional data is additional data for identifying the specific audio stream as an audio stream including the basic audio data and the extended audio data. DVD player.