Video and audio reproducing apparatus and method of reproducing the same

1. Field of the Invention

The present invention relates to a video and audio reproducing apparatus that reproduces and outputs video data and audio data recorded on a recording medium, such as an optical disk or the like, at a fast speed in a forward direction or a backward direction, and a method thereof.

2. Description of the Related Art

Generally, a recording medium in which video or audio, and sub-video are encoded according to a DVD-Video standard and then compressed and recorded, and a reproducing apparatus thereof have been put into practical use. In this reproducing apparatus, not only common reproducing but also special reproducing, such as forward reproducing at a fast speed or backward reproducing at a fast speed, can be performed. According the DVD-Video standard, in a VOBU (Video Object Unit) that is a logical minimal reproducing unit, navigation data (NV_PCK) for controlling reproducing of the VOBU as shown in FIG. 2 is recorded, in addition to presentation data like video data (V_PCK) or audio data (A_PCK) or sub-picture data (SP_PCK).

As shown in FIG. 3 , PCI_GI (general information of PCI), NSML_AGLI (non-seamless angle information), HLI (highlight information), and RECI (recording information) are included in the navigation data (NV_PCK). Further, as shown in FIG. 5 , DSI_GI (general information of DSI), SML_PBI (seamless playback information), SML_AGLI (seamless angle information), VOBU_SRI (VOBU search information), and SYNCI (synchronization information) are included in the navigation data (NV_PCK). As shown in FIG. 6 , in the VOBU-SRI, start addresses of the VOBU that are reproduced before and after 0.5×N seconds (N indicates integers of from 1 to 15) including right before or right after reproducing the VOBU, 10 seconds, 30 seconds, 60 seconds, and 120 seconds, are described.

The forward reproducing at a fast speed and the backward reproducing at a fast speed can be achieved by intermittently reproducing the VOBU by the VOBU_SRI, and the fast reproducing speed can be adjusted by varying the referencing location in the VOBU_SRI. That is, if the reproducing time of the VOBU is 0.5 second, the interval of the VOBU_SRI is also a unit of the 0.5 second. When forward reproducing at double speed is performed, an address of the VOBU reproduced after 1 second if N=2 is acquired from the VOBU_SRI to reproduce it, and when forward reproducing at quadruple speed is performed, an address of the VOBU reproduced after 2 seconds if N=4 is acquired from the VOBU_SRI to reproduce it (for example, see JP-A-10-126743)

However, since the reproducing time of the VOBU determined according to the DVD-Video standard is within a range of 0.4 to 1.2 seconds, it is not constant. Since the time interval at which the description is made in the VOBU_SRI is 0.5 second, if the referencing location in the VOBU_SRI is fixed at a fast speed, the accurate speed cannot be obtained. For example, in a case in which 2× reproducing is performed, even when an address of the VOBU reproduced after one second as N=2 is acquired and reproducing is performed, if the reproducing time of the VOBU is one second, it may become actually common reproducing. Similar to it, in a case in which 4× reproducing is performed, even when an address of the VOBU reproduced after 2 second as N=4 is acquired and reproducing is performed, if the reproducing time of the VOBU is one second, it may become actually the reproducing at 2×.

Accordingly, it is an object of the invention to provide a method of reproducing video and audio and an apparatus thereof, in which in a case in which video data or audio data recorded on a recording medium according to a DVD-Video standard is reproduced and outputted at a fast speed in a forward or backward direction, even when a reproducing time of a VOBU is not constant, accurate reproducing speed can be obtained.

In order to achieve the above-mentioned object, according to a first aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. The video and audio reproducing apparatus includes a correcting unit that corrects the designated double speed number according to a ratio of a reproducing time of a VOBU (Video Object Unit) calculated from the difference between VOBU_E_PTM and VOBU_S_PTM included in the VOBU of the recorded data, and a standard reproducing time (0.5 second); and a VOBU acquiring unit that refers to an address of VOBU_SRI included in the VOBU of the recorded data by representing a correction value of the designated double speed number as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, the designated double speed number is corrected by the reproducing time of the VOBU calculated from the information included in the VOBU, the address of the VOBU_SRI is referred to by representing the corrected designated double speed number as the exponent, and the address of the VOBU to be subsequently reproduced can be obtained. Even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the correct reproducing speed can be obtained.

According to a second aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. The video and audio reproducing apparatus includes a correcting unit that corrects the designated double speed number according to a ratio of a fixed value given as a reproducing time of a VOBU (Video Object Unit) and a standard reproducing time (0.5 second), and a VOBU acquiring unit that refers to an address of VOBU_SRI included in the VOBU of the recorded data by representing a correction value of the designated double speed as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, the designated double speed number is corrected by a fixed value given as a reproducing time of VOBU, the address of the VOBU_SRI is referred to by representing the corrected designated double speed number as the exponent, and the address of the VOBU to be subsequently reproduced can be obtained. Even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the correct reproducing speed can be obtained.

According to a third aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. He video and audio reproducing apparatus includes an absolute time calculating unit that calculates an absolute time of a VOBU (Video Object Unit) to be subsequently reproduced from a value obtained by multiplexing a reproducing time of a VOBU calculated from the difference between VOBU_E_PTM and VOBU_S_PTM included in the VOBU of the recorded data by the designated double speed number, and a current passage time, and a VOBU acquiring unit that refers to an address of MAP_EN of MAP_ENT included in VTSI of the recorded data by representing a value obtained by dividing the absolute time of the VOBU by TMU included in the VTSI of the recorded data as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, the absolute time of the VOBU to be subsequently reproduced is calculated by multiplexing the reproducing time of the VOBU calculated from the information included in the VOBU by the designated double speed number, the address of the MAP_ENT is referred to by representing the value obtained by dividing the absolute time by the TMU as the exponent, and the address of the VOBU to be subsequently reproduced can be obtained from the MAP_EN. Even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the accurate reproducing speed can be obtained.

According to a fourth aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. The video and audio reproducing apparatus includes an absolute time calculating unit that calculates an absolute time of a VOBU (Video Object Unit) to be subsequently reproduced from a value obtained by multiplexing a fixed value given as a reproducing time of a VOBU by the designated double speed number, and a current passage time, and a VOBU acquiring unit that refers to MAP_EN of MAP_ENT included in VTSI of the recorded data by representing a value obtained by dividing the absolute time of the VOBU by TMU included in the VTSI of the recorded data as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, the absolute time of the VOBU to be subsequently reproduced is calculated by multiplexing a fixed value given as the reproducing time of the VOBU by the designated double speed number, the address of the MAP_ENT is referred by representing the value obtained by dividing the absolute time by the TMU as the exponent, and the address of the VOBU to be subsequently reproduced can be obtained from the MAP_EN. Even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the accurate reproducing speed can be obtained.

According to a fifth aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. The video and audio reproducing apparatus includes a correcting unit that corrects the designated double speed number according to a ratio of a reproducing time of a VOBU calculated by the difference between VOBU_E_PTM and VOBU_S_PTM included in the VOBU of the recorded data, and a standard reproducing time (0.5 second), a VOBU acquiring unit that refers to an address of VOBU_SRI included in the VOBU of the recorded data by representing a correction value of the designated double speed as an exponent, and acquires a VOBU to be subsequently reproduced, an absolute time calculating unit that calculates an absolute time of a VOBU to be subsequently reproduced from a value obtained by multiplexing a reproducing time of the VOBU calculated from the difference between VOBU_E_PTM and VOBU_S_PTM included in the VOBU of the recorded data by the designated double speed number, and a current passage time, when the designated double speed number is the predetermined double speed number or more, and a VOBU acquiring unit that refers to an address of MAP_EN of MAP_ENT included in the VTSI of the recorded data by representing a value obtained by dividing the absolute time of the VOBU by TMU included in the VTSI of the recorded data as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, when the designated double speed number is smaller than the predetermined double speed number, the designated double speed number is corrected by the reproducing time of the VOBU calculated from the information included in the VOBU, the address of the VOBU_SRI is referred to by representing the corrected double speed number as the exponent, and the address of the VOBU to be subsequently reproduced is obtained. When the designated double speed number is equal to or greater than the predetermined double speed number, the absolute value of the VOBU to be subsequently reproduced is calculated by multiplexing the reproducing time of the VOBU calculated from the information included in the VOBU by the designated double speed number, the address of the MAP_ENT is referred to by representing the value obtained by dividing the absolute time by the TMU as the exponent, and the address of the VOBU to be subsequently reproduced is obtained from the MAP_EN. Therefore, even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the accurate reproducing speed can be obtained.

According to a sixth aspect of the invention, there is provided a video and audio reproducing apparatus that performs double speed reproducing of video and audio on the basis of the designated double speed number of recorded data according to a DVD-Video standard. The video and audio reproducing apparatus includes a correcting unit that corrects the designated double speed number according to a ratio of a fixed value given as a reproducing time of a VOBU and a standard reproducing time (0.5 second), a VOBU acquiring unit that refers to an address of VOBU_SRI included in the VOBU of the recorded data by representing a correction value of the designated double speed number as an exponent, and acquires a VOBU to be subsequently reproduced, an absolute time calculating unit that calculates an absolute time of a VOBU to be subsequently reproduced from a value obtained by multiplexing a fixed value given as a reproducing time of the VOBU by the designated double speed number, and a current passage time, when the designated double speed number is equal to greater than the predetermined double speed number, and a VOBU acquiring unit that refers to MAP_EN of MAP_ENT included in VTSI of the recorded data by representing a value obtained by dividing the absolute time of the VOBU by TMU included in the VTSI of the recorded data as an exponent, and acquires a VOBU to be subsequently reproduced.

According to this configuration, when the designated double speed number is smaller than the predetermined double speed number, the designated double speed number is corrected by the fixed value given as the reproducing time of the VOBU, the VOBU_SRI is referred to by representing the corrected designated double speed number as the exponent, and the address of the VOBU to be subsequently reproduced is obtained. When the designated double speed number is equal to or greater than the predetermined double speed number, the absolute value of the VOBU to be subsequently reproduced is calculated by multiplexing the fixed value given as the reproducing time of the VOBU by the designated double speed number, the MAP_ENT is referred to by representing the value obtained by dividing the absolute time by the TMU as the exponent, and the address of the VOBU to be subsequently reproduced is obtained from the MAP_EN. Therefore, even when the reproducing time of the VOBU is not 0.5 second to be the standard reproducing time, the accurate reproducing speed can be obtained.

According to the aspects of the invention, when the video data or the audio data recorded in the recording medium according to the DVD-Video standard is reproduced and outputted at a fast speed in a forward or backward direction, the reproducing time of the VOBU is acquired from the management information, or the reproducing time of the VOBU is fixed, and thus the accurate exponent can be calculated for obtaining the address of the VOBU to be subsequently reproduced. Accordingly, even when the reproducing time of the VOBU is not constant, the accurate reproducing speed can be obtained.

FIG. 1 is a diagram illustrating a video reproducing apparatus according to an embodiment of the invention.

FIG. 2 is a diagram illustrating VOBU of a DVD-Video standard.

FIG. 3 is a diagram illustrating PCI included in NV_PCK of a header of VOBU.

FIG. 4 is a diagram illustrating PCI_GI included in PCI.

FIG. 5 is a diagram illustrating DSI included in NV_PCK of a header of VOBU.

FIG. 6 is a diagram illustrating VOBU_SRI included in DSI.

FIG. 7 is a diagram illustrating VTSI of a DVD-Video standard.

FIG. 8 is a diagram illustrating VTS_TMAPTI included in VTSI.

FIG. 9 is a diagram illustrating VTS_TMAPTI included in VTS_TMAPT.

FIG. 10 is a diagram illustrating VTS_TMAP_SRP included in VTS_TMAPT.

FIG. 11 is a diagram illustrating VTS_TMAP included in VTS_TMAPT.

FIG. 12 is a diagram illustrating a reproducing method according to a first embodiment of the invention.

FIG. 13 is a diagram illustrating a reproducing method according to a second embodiment of the invention.

FIG. 14 is a diagram illustrating a reproducing method according to a third embodiment of the invention.

FIG. 15 is a diagram illustrating a reproducing method according to a fourth embodiment of the invention.

FIG. 16 is a diagram illustrating a reproducing method according to a fifth embodiment of the invention.

FIG. 17 is a diagram illustrating a reproducing method according to a sixth embodiment of the invention.

FIG. 18 is a diagram illustrating a control unit of a video reproducing apparatus according to an embodiment of the invention.

First Embodiment

FIG. 1 is a block diagram illustrating a structure of a video reproducing apparatus according to an embodiment of the invention. In FIG. 1 , reference numeral 101 indicates an optical disk that serves as a recording medium, reference numeral 102 indicates a data acquiring unit, reference numeral 103 indicates a data holding unit, reference numeral 104 indicates a DVD decoding unit, reference numeral 105 indicates a control unit, reference numeral 106 indicates an input device, and reference numeral 107 indicates an image display unit.

In the optical disk 101 , presentation data including compressed video data or audio data, and navigation data including attribute data or reproducing control data of the presentation data are recorded. The data acquiring unit 102 acquires the presentation data and the navigation data from the recording medium 101 , and transmits them to the data holding unit 103 . The data holding unit 103 holds the transmitted presentation data and navigation data, and transmits them to the DVD decoder 104 . In accordance with the setting by the control unit 105 , the DVD decoder 104 decodes the transmitted presentation data, and outputs it to the image display unit 107 as a video signal and an audio signal. The image display unit 107 outputs the video signal and the audio signal outputted by the DVD decoder 104 through a display or a speaker. The input device 106 includes a remote controller or a plurality of keys, and a user inputs instruction to the control unit through the input device 106 . In accordance with the instruction inputted from the input device, the control unit 105 controls the data acquiring unit 102 , the data holding unit 103 , and the DVD decoder 104 .

Further, a functional block of each of the data acquiring unit 102 , the data holding unit 103 , the DVD decoder 104 , and the control unit 105 are typically implemented as an LSI to be an integrated circuit. Each of the functional blocks of the data acquiring unit 102 , the data holding unit 103 , the DVD decoder 104 , and the control unit 105 may be constructed as one chip, and a portion or all of them may be constructed as one chip.

In this case, each functional block is implemented as the LSI, but it may be implemented as an IC, a system LSI, a super LSI, and an ultra LSI according to the components per chip.

Further, a method of forming an integrated circuit is not limited to the LSI, but it may be achieved by a dedicated circuit or a general-purpose processor. Specifically, a FPGA (Field Programmable Gate Array) in which programming can be made after manufacturing the LSI, or a reconfigurable processor in which connection or setting of circuit cells in the LSI is reconfigurable may be used.

Furthermore, if a technology for replacing the integrated circuit with the LSI is developed by the progress of the semiconductor technology or a derivative technology from the semiconductor technology, the integration of the functional blocks may be performed by using the technology. A biological technology has been newly suggested and developed.

The data, which is acquired from the optical disk 101 by the data acquiring unit 102 and held in the data holding unit 103 , has a data structure VOBU shown in FIG. 2 . The VOBU has a header which includes management information called NV_PCK, and the control unit 105 refers to NV_PCK from the data holding unit 103 . Further, a compressed data portion of the VOBU is transmitted to the DVD decoder 104 , and the image display unit 107 outputs the video and the audio according to the setting of the control unit 105 .

The NV_PCK includes two pieces of information of DSI and PCI. Information related to the current VOBU is described in the PCI, and the PCI includes PCI_GI, NSML_AGLI, HLI, and RECI, as shown in FIG. 3 . The PCI_GI includes NV_PCK_LBN, VOBU_CAT, VOBU_UOP_CTL, VOBU_S_PTM, VOBU_E_PTM, VOBU_SE_E_PTM, and C_ELTM, as shown in FIG. 4 . Further, the DSI includes DSI_GI, SML_PBI, SML_AGLI, VOBU_SRI, and SYNCI, as shown in FIG. 5 .

The control unit 105 refers to VOBU_SRI from the data holding unit 103 , and outputs the acquiring request of a VOBU to be subsequently reproduced to the data acquiring unit 102 to perform continuous reproducing.

Further, the video reproducing apparatus can performs double speed reproducing of the video and audio in a forward or backward direction. The VOBU_SRI has a structure shown in FIG. 6 , and a start address of a next VOBU is described in the FWDI Next, a start address of a VOBU after 0.5 second is described in FWDI 1 , a start address of a VOBU after 1.0 second is described in FWDI 2 , and a start address of a VOBU is described for every 0.5 second. When the double speed reproducing is performed, the video and the audio are sequentially reproduced by using VOBU_SRI, and thus double speed reproducing can be performed.

FIG. 12 is a block diagram illustrating a method of reproducing video according to a first embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 . In FIG. 12 , if the data acquiring unit 102 holds a VOBU acquired from the optical disk 101 in the data holding unit, a series of processes start from the process S 101 .

In the process S 101 , the control unit 105 acquires NV_PCK from the data holding unit. In the process S 102 , it is determined whether the designated double speed number n is not less than 20. When it is determined that the double speed number n is not less than 20, the process proceeds to the process S 103 , and when it is determined that the double speed number n is less than 20, the process proceeds to the process S 104 . In the process S 103 , the designated double speed number n is set to i. In the process S 104 , the difference between VOBU_S_PTM and VOBU_E_PTM is calculated, and a total reproducing time TVOBU of one VOBU is calculated. In the process S 105 , the TVOBU calculated in the process S 104 is multiplied by the double speed number n to calculate a time TJUMP to the jump destination. In the process S 106 , the value of TJUMP is divided by 45000 indicating 0.5 second by the PTM, and the quotient of the obtained value is set to i. When the remainder exists, a value 1 is added to i. In the process S 107 , the value of i is determined. When the value of i is not less than 16, the process proceeds to the process S 108 , and when the value of i is less than 16, the process proceeds to the process S 109 . In the process S 108 , the originally designated double speed number n is substituted for i. In the process S 109 , the value of VOBU_SRI is referred to. In this case, when forward reproducing is performed, the process is completed by referring to the FWDI i, and when backward reproducing is performed, the process is completed by referring to BWDI i. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU obtained in the process S 109 . By repeating the above-described processes S 101 to S 109 , an intermittent reproducing process is performed, which achieves double speed reproducing.

Second Embodiment

In the first embodiment, a total reproducing time of one VOBU is calculated from the data of the VOBU, but in the second embodiment, the reproducing time of the VOBU is set to the fixed value of the image output time. FIG. 13 is a block diagram illustrating a method of reproducing video according to a second embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 .

In FIG. 13 , if the VOBU acquired from the optical disk 101 by the data acquiring unit 102 is held in the data holding unit, a series of processes start from the process S 201 . In the process S 201 , the control unit 105 acquires NV_PCK from the data holding unit. In the process S 202 , it is determined whether the designated double speed number n is not less than 20. When it is determined that the double speed number n is not less than 20, the process proceeds to the process S 203 , and when it is determined that the double speed number n is less than 20, the process proceeds to the process S 204 . In the process S 203 , the designated double speed number n is set to i. In the process S 204 , the fixed value T CONST of the image output time is multiplied by the double speed number n, and a time T JUMP to the jump destination is calculated. In the process S 205 , the value of T JUMP is divided by 45000 indicating 0.5 second by the PTM, and the quotient of the obtained value is set to i. When the remainder exists, a value 1 is added to i. In the process S 206 , the value of i is determined. When the value of i is not less than 16, the process proceeds to the process S 207 , and when the value of i is less than 16, the process proceeds to the process S 208 . In the process S 207 , the originally designated double speed number n is substituted for i. In the process S 208 , the value of VOBU_SRI is referred to. In this case, when forward reproducing is performed, the process is completed by referring to FWDI i, and when backward reproducing is performed, the process is completed by referring to BWDI i. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU acquired by the process S 208 . By repeating the above-described processes S 201 to S 208 , an intermittent reproducing process is performed, which achieves double speed reproducing.

Third Embodiment

In the third embodiment, in order to acquire the time information, the management information VTS_TMAP (video title set time map) is used. The VTS_TMAP exists in the management information VTSI (video title set information). As shown in FIG. 7 , the header of the VTSI has VTSI_MAT, and VTS_TMAPT used in the third embodiment. As shown in FIG. 8 , the header of the VTSI_TMAPT has VTS_TMAPTI. As shown in FIG. 9 , the VTS_TMAPTI is constructed by the number of the time map (VTS_TMAP_Ns) and the final address of VTS_TMAP (VTS_TMAPT_EA). Then, VTS_TMAP_SRP is subsequent. As shown in FIG. 10 , the start address of VTS_TMAP (VTS_TMAP_SA) is described. The necessary VTS_TMAP is selected from the VTS_TAMP_SRP. As shown in FIG. 11 , the VTS_TMAP includes a time unit TMU, the entry number of the map MAP_EN_Ns, and a table of the map entry MAP_ENT.

FIG. 14 is a block diagram illustrating a method of reproducing video according to a third embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 . In FIG. 14 , if the data acquiring unit 102 holds the VOBU obtained from the optical disk 101 in the data holding unit, a series of processes start from the process S 301 .

In the process S 301 , the control unit 105 acquires NV_PCK from the data holding unit. In the process S 302 , the difference between the VOBU_S_PTM and VOBU_E_PTM is calculated, and a total reproducing time TVOBU of one VOBU is calculated. In the process S 303 , the TVOBU calculated in the process S 302 is multiplied by the double speed number n, and a time T JUMP to the jump destination is calculated. In the process S 304 , a sum between the T JUMP and the current time T NOW (the difference at the time of backward reproducing) is calculated, and the reproduced absolute time T PLAY is calculated. In the process S 305 , the time of T PLAY is divided by TMU, and the quotient is set to i. In the process S 306 , the (i+1)th MAP_EN is acquired from the MAP_ENT, and the process is completed. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU obtained in the process S 306 . By repeating the above-described processes S 301 to S 306 , an intermittent reproducing process is performed, which achieves double speed reproducing.

Fourth Embodiment

In the third embodiment, a total reproducing time of one VOBU is calculated from the data of the VOBU, but in the fourth embodiment, the reproducing time of the VOBU is set to the fixed value of the image output time. FIG. 15 is a block diagram illustrating a method of reproducing an image according to a fourth embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 .

In FIG. 15 , if the VOBU acquired from the optical disk 101 by the data acquiring unit 102 is held in the data holding unit, a series of processes start from the process S 401 . In the process S 401 , the control unit 105 acquires NV_PCK from the data holding unit. In the process S 402 , the fixed value T CONST of the image output time is multiplied by the double speed number n, and a time T JUMP to the jump destination is calculated. In the process S 403 , a sum between the T JUMP and the current time T NOW (the difference at the time of backward reproducing) is calculated, and the reproduced absolute time T PLAY is calculated. In the process S 404 , the time of TPLAY is divided by TMU, and the quotient is set to i. In the process S 405 , the (i+1)th MAP_EN is acquired from the MAP_ENT, and the process is completed. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU obtained in the process S 405 . By repeating the above-described processes S 401 to S 405 , an intermittent reproducing process is performed, which achieves double speed reproducing.

Fifth Embodiment

FIG. 16 is a block diagram illustrating a method of reproducing video according to a fifth embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 . The fifth embodiment corresponds to a combination of the first embodiment and the third embodiment. In FIG. 16 , if the data acquiring unit 102 holds the VOBU obtained from the optical disk 101 in the data holding unit, a series of processes start from the process S 501 .

In the process S 501 , the control unit 105 acquires NV_PCK from the data holding unit. In the process S 502 , the difference between the VOBU_S_PTM and VOBU_E_PTM is calculated, and a total reproducing time T VOBU of one VOBU is calculated. In the process S 503 , the T VOBU calculated in the process S 502 is multiplied by the double speed number n, and a time T JUMP to the jump destination is calculated. In the process S 504 , the value of T JUMP is divided by a value 45000 obtained by converting 0.5 second into the PTM, and the quotient is set to i. When the remainder exists, a value 1 is added to i. In the process S 505 , the value of i is determined. When the value of i is not less than 16, the process proceeds to the process S 506 , and when the value of i is less than 16, the process proceeds to the process S 509 . In the process S 506 , the difference between the T JUMP obtained in the process S 503 and the current time T NOW is calculated, and the reproduced absolute time T PLAY is calculated. In the process S 507 , the time of the T PLAY is divided by the TMU, and the quotient is set to i. In the process S 508 , the (i+1)th MAP_EN is acquired from the MAP_ENT, and the process is completed. In the process S 509 , on the basis of the value of i calculated in the process S 504 , the value of VOBU_SRI is referred to. In this case, when forward reproducing is performed, the process is completed by referring to the FWDI i, and when backward reproducing is performed, the process is completed by referring to the BWDI i. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU obtained in the process S 508 or the process S 509 . By repeating the above-described processes S 501 to S 509 , an intermittent reproducing process is performed, which achieves double speed reproducing.

Sixth Embodiment

FIG. 17 is a block diagram illustrating a method of reproducing video according to a sixth embodiment of the invention, which schematically illustrates process contents executed in the control unit 105 of the video reproducing apparatus shown in FIG. 1 . The sixth embodiment corresponds to a combination of the second embodiment and the fourth embodiment. In FIG. 17 , if the data acquiring unit 102 holds the VOBU obtained from the optical disk 101 in the data holding unit, a series of processes start from the process S 601 . In the process S 601 , the control unit 105 acquires NV_PCK from the data holding unit.

In the process S 602 , the fixed value T CONST of the image output time is multiplied by the double speed number n, and a time T JUMP to the jump destination is calculated. In the process S 603 , the value of T JUMP is divided by a value 45000 obtained by converting 0.5 second into the PTM, and the quotient is set to i. When the remainder exists, a value 1 is added to i. In the process S 604 , the value of i is determined. When the value of i is not less than 16, the process proceeds to the process S 605 , and when the value of i is less than 16, the process proceeds to the process S 608 . In the process S 605 , the difference between the T JUMP obtained in the process S 602 and the current time T NOW is calculated, and the reproduced absolute time T PLAY is calculated. In the process S 606 , the time of the T PLAY is divided by the TMU, and the quotient is set to i. In the process S 607 , the (i+1)th MAP_EN is acquired from the MAP_ENT, and the process is completed. In the process S 608 , on the basis of the value of i calculated in the process S 603 , the value of VOBU_SRI is referred to. In this case, when forward reproducing is performed, the process is completed by referring to the FWDI i, and when backward reproducing is performed, the process is completed by referring to the BWDI i. The control unit 105 requires that the data acquiring unit 102 acquires the VOBU from the start address of the VOBU obtained in the process S 607 or the process S 608 . By repeating the above-described processes S 601 to S 608 , an intermittent reproducing process is performed, which achieves double speed reproducing.

FIG. 18 is a schematic diagram illustrating a physical structure of the control unit 105 in the above-described first to sixth embodiments. The function of the control unit 105 can be achieved by reading program codes stored in the recording medium 202 or the RAM 204 by the built CPU 201 . The I/F 203 performs data transmission and reception together with a DVD decoder 104 , the input device 106 , and the optical disk 101 .

The recording medium in which program codes of the software achieving the functions according to the embodiments of the invention are recorded is supplied to the system or the apparatus, and the program codes that are stored in the recording medium by the CPU of the supplied system or the apparatus are read out and executed, which results in achieving the functions according to the embodiments of the invention. In this case, the program codes read out from the recording medium achieve the functions according to the embodiments of the invention, and thus the recording medium in which the program codes are recorded achieves the functions according to the embodiments of the invention. As the recording medium 202 , for example, a non-volatile memory, a ROM, a hard disk, an optical disk, a CD-ROM, a CD-R, a floppy disk, or the like may be used.

In order to expand or modify the functions, a portion or all of the program codes may be rewritten. Instead of the optical disk 101 , an updating disk is frequently used in which the program codes for achieving the functions according to the embodiments of the invention are recorded. The program codes that are read out by the updating disk may be stored in the recording medium 202 . Therefore, the updating disk in which the program codes are recorded also can form the embodiment of the invention.

In the method of reproducing video and audio and the apparatus thereof according to the invention, when the video data and the audio data recorded in the recording medium according to the DVD-Video standard are reproduced and outputted at a fast speed in a forward or backward direction, the reproducing time of the VOBU is acquired from the management information, or the reproducing time of the VOBU is fixed, and thus the accurate exponent can be calculated for obtaining the address of the VOBU to be subsequently reproduced. Therefore, even when the reproducing time of the VOBU is not constant, the accurate reproducing speed can be obtained. Further, the method of reproducing video and audio and the apparatus thereof according to the invention can be used as a method of reproducing video and audio and an apparatus thereof in which video data or audio data recorded in a recording medium, such as an optical disk, is reproduced and outputted at a fast speed in a forward direction or a backward direction.