JPH10334589A - Recording medium reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the read-out of data without exceeding a transmission band of a transmission line at the time of variable speed reproduction. SOLUTION: A presentation data reproduced from a DVD(digital video disk) and stored in a memory 44 is read out in accordance with a timing signal from a read timing generating circuit 41, and is supplied to an SCR(system clock reference)/PTS(presentation time stamp)/DTS(decoding time stamp) inserting part 45 by a read/write controller 43. Variable speed reproducing PTS and DTS are generated by a PTS/DTS calculation circuit 47 based on the SCR generated by an SCR generating circuit 49 based on an STC(system time clock) of an STC generating circuit 48. The SCR of a pack header and the PTS and DTS in a PES header of the presentation data supplied from the memory 44 are replaced with the presently generated ones and sent to the transmission line by the SCR/PTS/DTS inserting part 45. The read-out of the data from the DVD is paused by the read/write controller 43 via a drive controller 42 when the read-out is likely to exceed the transmission band of the transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproducing apparatus and method, and more particularly, to transmitting a data reproduced in a variable speed reproduction mode through a transmission path, by setting a transmission rate to a predetermined value so that the transmission path is not broken. The present invention relates to a recording medium reproducing apparatus and a method for controlling a recording rate at or below a maximum rate.

[0002]

[Prior Art] Recently, DVD (Digital Versatile Disc)-
Video (hereinafter simply referred to as DVD) has been standardized, and its spread is expected. In this DVD, video data is compressed and recorded by MPEG (Moving Picture Experts Group). The DVD player reproduces the DVD in the drive unit, decodes the data reproduced from the DVD in the decoding unit, outputs the data to a television receiver or the like, and displays the data.

By the way, there is a possibility that a television receiver having a function of decoding data encoded by the MPEG system will be developed in the future. In such a case, a DVD player and a television receiver having a decoding function are connected via an AV bus, and a bit stream as encoded is output from the DVD player,
It is conceivable that the data is supplied to a television receiver having a decoding function via the AV bus, and is decoded on the television receiver side.

In the conventional real-time transmission model of DVD-VIDEO, it is assumed that VBR (Variable Bit Rate: variable rate) control is performed for rate control during transmission during normal reproduction. The VBR control is to restore the timing at the time of encoding and transmit data at that timing. Therefore, the decoding side (in this case,
In the television receiver having the decoding function, even if the data is sequentially decoded as soon as the data is supplied, the decoding buffer for temporarily storing the data does not underflow or overflow.

In trick play modes such as fast-forward playback, reverse playback, and double-speed playback, only I-pictures and P-pictures are read from a DVD player, and the SCR (System Cloc)
k Reference), PTS (Presentation Time Stamp), DTS
(Decoding Time Stamp) is ignored, and is decoded as soon as data arrives in the decode buffer. For this reason, underflow and overflow of the decode buffer can be eliminated.

[0006]

However, in the trick play mode, the transmission path (in this case, the AV bus)
Data is read from DVD at a rate exceeding the bandwidth of
There is a possibility that it will be sent to the transmission path. IEEE as an AV bus
(Institute of Electrical and Electronics Engineer
s) When using the 1394, isochronous channel of the High Performance Serial Bus standard (hereinafter simply referred to as 1394), there is a possibility that data is read from the DVD beyond the reserved band in order to secure a predetermined fixed band in advance. There was a challenge.

In the VBR control, the transmission timing is measured based on the SCR. However, in the trick play mode, the SCR is ignored and the data is transmitted via the transmission path to the decoding side (in this case, decoding is performed). (A television receiver having a function), there is a problem that VBR control cannot be performed.

The present invention has been made in view of such a situation, and it is an object of the present invention to control a maximum rate at which data is transmitted to a transmission path in a trick play mode.

[0009]

According to a first aspect of the present invention, there is provided a recording medium reproducing apparatus for reproducing data recorded on a recording medium in a normal reproduction mode and a variable speed reproduction mode, and reproducing data from the recording medium. A first transmission unit for temporarily storing data before transmitting it to the transmission path and transmitting the data to the transmission path in accordance with a timing at the time of encoding the data, and transmitting the data reproduced from the recording medium to the transmission path. A second transmission unit that temporarily holds the data before transmission and restricts the data to a predetermined transmission rate or less and transmits the data to a transmission path; Switching means for switching the data to be processed by either one of the transmission means. Data reproduced from the medium second
Is switched so as to be processed by the transmission means.

According to a third aspect of the present invention, there is provided a recording medium reproducing method for reproducing data recorded on a recording medium in a normal reproduction mode and a variable speed reproduction mode, and transmitting data reproduced from the recording medium to a transmission path. A first transmission step of transmitting data to a transmission path in accordance with a timing at the time of encoding data, and temporarily storing data reproduced from a recording medium before transmission to the transmission path. A second transmission step of restricting data to a predetermined transmission rate or less and transmitting the data to a transmission path, and when data recorded on a recording medium is reproduced in a variable-speed reproduction mode,
A switching step of switching data reproduced from the recording medium to be processed by the second transmission step.

According to a fourth aspect of the present invention, there is provided a recording medium reproducing apparatus for reproducing data recorded on a recording medium in a normal reproduction mode and a variable speed reproduction mode, and for reproducing the data recorded on the recording medium. When reproducing in the variable speed reproduction mode, the reproducing device includes a changing unit that temporarily holds data reproduced from the recording medium before transmitting the data to the transmission path, and changes a time stamp of the data according to the variable speed reproduction mode. And

According to a sixth aspect of the present invention, there is provided a recording medium reproducing method for reproducing data recorded on a recording medium in a normal reproduction mode and a variable speed reproduction mode, and reproducing data recorded on the recording medium in a variable speed reproduction mode. And a step of temporarily holding data reproduced from the recording medium before transmitting the data to the transmission path, and changing a time stamp of the data in accordance with the variable speed reproduction mode.

In the recording medium reproducing apparatus according to the first aspect, the reproducing means reproduces the data recorded on the recording medium in the normal reproduction mode and the variable speed reproduction mode, and the first transmission means reproduces the data from the recording medium. The reproduced data is temporarily held before being transmitted to the transmission path, and the data is transmitted to the transmission path in accordance with the timing at the time of encoding the data. Is temporarily stored before being transmitted to the transmission path, and the data is transmitted to the transmission path while limiting the data to a predetermined transmission rate or less. The switching means outputs the data transmitted from the recording medium to the first transmission means and Switching is performed so as to be processed by one of the second transmission means. Then, the switching means switches the data reproduced from the recording medium to be processed by the second transmission means when the reproducing means reproduces the data recorded on the recording medium in the variable speed reproduction mode.

According to a third aspect of the present invention, the data recorded on the recording medium is reproduced in the normal reproduction mode and the variable-speed reproduction mode, and the data reproduced from the recording medium is transmitted to the transmission path. Data is transmitted to a transmission line, or data reproduced from a recording medium is temporarily stored before being transmitted to the transmission line, and the data is temporarily stored. When the data recorded on the recording medium is reproduced in the variable speed reproduction mode, the data reproduced from the recording medium is transmitted with the transmission rate restricted to a predetermined transmission rate or less. The processing is switched so as to be transmitted to the path.

According to a fourth aspect of the present invention, the reproducing means reproduces the data recorded on the recording medium in the normal reproduction mode and the variable speed reproduction mode, and the changing means reproduces the data recorded on the recording medium. When reproducing recorded data in the variable speed reproduction mode, the data reproduced from the recording medium is temporarily held before being transmitted to the transmission path, and the time stamp of the data is changed according to the variable speed reproduction mode.

According to a sixth aspect of the present invention, data recorded on a recording medium is reproduced in a normal reproduction mode and a variable speed reproduction mode, and data recorded on the recording medium is reproduced in a variable speed reproduction mode. In this case, the data reproduced from the recording medium is temporarily held before being transmitted to the transmission path, and the time stamp of the data is changed according to the variable speed reproduction mode.

[0017]

FIG. 1 shows a configuration example of an AV system to which a recording medium reproducing apparatus of the present invention is applied. The DVD player 1 has a drive unit 2 and a decoding unit 3 as described later with reference to FIG. In this configuration example, a plurality of (two in this embodiment) digital television receivers 5-1 and 5-2 are connected to the DVD player 1 via the AV bus 4. Each digital television receiver (digital TV) 5-1 and 5
-2 decodes the encoded data transmitted from the DVD player 1 via the AV bus 4 to each of the digital television receivers. 5-1 and 5-2 are displayed.

As the AV bus 4, for example, IEEE (Instit)
ute of Electrical and Electronics Engineers) 13
94, a digital interface of the High Performance Serial Bus standard (hereinafter simply referred to as 1394) is used.

FIG. 2 shows an example of the internal configuration of the DVD player 1 and the decoding section 6-1. Since the configuration and operation of the decoding unit 6-2 are the same as those of the decoding unit 6-1, the description of the decoding unit 6-2 will be omitted as appropriate. As shown in FIG. 1, the DVD player 1 includes a drive unit 2 and a decoding unit 3, and outputs data reproduced and output from the DVD 21 by the drive unit 2 to the decoding unit 3. To the digital television receivers 5-1 and 5-2 connected to the digital television receiver 5-1.

The demultiplexer 11 constituting the decoding section 3 separates the data supplied from the drive section 2 into sub-picture data such as audio data, video data and subtitles. AV decoder 12
Has three built-in decoders for independently decoding these audio data, video data, and sub-picture data, and performs decoding processing of the corresponding data. The buffer 13 is a working buffer when the AV decoder 12 performs a decoding process. The data decoded by the decoding unit 3 is D / A-converted by an AD converter (not shown), and then output to an analog television receiver or the like, and an image corresponding to the data is displayed and a corresponding audio signal is displayed. Is output.

Pickup 22 constituting drive unit 2
(Reproducing means) irradiates the DVD 21 with laser light,
The data recorded there is reproduced. FIG. 3 shows a format of data recorded on the DVD 21. That is, as shown in FIG.
The DVD 21 contains the video manager information (V
ideo Manager Information (VMGI)) is recorded as navigation data, followed by VMGM_VOBS (Video Object Set fo
r VMG Menu), followed by a VM
GI backup data is recorded.

Next, a video title set information (VT) is displayed.
SI)) is recorded as navigation data, followed by VTSM_V as presentation data.
OBS (Video Object Set for VTS Menu) is recorded.

VMGM_VOBS is a plurality of VOBs (Video Objects)
Each VOB is composed of a plurality of cells, and each cell is composed of a plurality of VOBUs (Video Object Units).
It consists of.

Further, each VOBU includes NV_PCK (Navi Pack),
V_PCK (Video Pack), A_PCK (AudioPack) and SP_PCK
(Sub-picture Pack). Each of these packs is composed of 2048 bytes.

The NV_PCK further includes PCI (Presentat
ion Control Information) and DSI (Data Search Inform)
ation).

V_PCK is the pack ID, SCR (System
Clock Reference) and video data.

As will be described later, the system controller 2
4 (switching means) navigation data (navigation information) captured by the navigation manager 25
Means VMGI, VTSI and NV_PCK described above.

The output of the pickup 22 is ECC & Seamless
The data is input to the control circuit 23, error processing is performed, and the reproduction data is divided into presentation data and navigation information.

The presentation data output from the ECC & Seamless control circuit 23 is transmitted to the VBR control circuit 27 via the switch 30 controlled by the system controller 24.
(First transmission means) and the maximum rate control unit 28 (second
Transmission means). Also, ECC & Seam
Of the output of the less control circuit 23, the navigation data is supplied to the navigation manager 25 of the system controller 24. Then, the digital television receivers 5-1 and 5 are connected via the AV bus 4.
-2 decoders 6-1 and 6-2.

The VBR control circuit 27 restores the timing at the time of encoding and transmits data. The maximum rate control unit 28 controls reading of data from the DVD 21 by the system controller 24 based on the transmission rate of data to be transmitted to the AV bus 4, as described later with reference to FIG. .

The system controller 24 responds to a control signal from the maximum rate controller 28 to
And the access to the DVD 21 is controlled. When trick play such as fast forward playback, reverse playback, and double speed playback is designated by a user operation, a signal corresponding to the operation is input via a user I / F control circuit 26 constituting the system controller 24. It has been made to be. System controller 24
When detecting that a trick play mode has been entered, based on a signal input via the user I / F control circuit 26, the switch is set so that the output of the ECC & seamless control circuit 23 is supplied to the maximum rate control unit 28. 30 is switched. Also, data (system parameters) corresponding to the user operation is transmitted to the Asynch via the AV bus 4.
The data is transmitted to the decoding units 6-1 and 6-2 by ronous communication.

The maximum rate control unit 28 checks the transmission rate so as not to exceed the maximum transmission rate secured in advance on the AV bus 4, and if it determines that the maximum rate is about to be exceeded, the system controller 24 sends a signal from the DVD 21 to the system controller 24. By transmitting a signal instructing to suspend reading of data and transmitting a signal instructing to resume reading of data from the DVD 21 when transmission becomes possible,
The rate control is performed so that the AV bus 4 does not fail.

[0033] The data subjected to the rate control is directly transmitted to the MP.
Isochron via AV bus 4 with EG2-PS (Program Stream)
digital television receiver 5-
1, 5-2, and after being converted to MPEG2-TS (Transport Stream) in the PS / TS conversion circuit 29, the digital television receiver 5-1 is transmitted via the AV bus 4 on the Isochronous channel. , 5-2.

These data are output to the digital television receivers 5-1 and 5-2 via the AV bus 4 before being demultiplexed. Then, the digital television receivers 5-1 and 5
The decoding units 6-1 and 6-2 included in the decoding unit 2 are respectively decoded.

A demultiplexer (DEMUX) 31 constituting the decoding unit 6-1 converts the data transmitted via the AV bus 4 into audio data, video data, sub-picture data, and navigation data (NV_PCK).
It is made to separate. Then, the audio data, the video data, and the sub-picture data are supplied to the AV decoder 32, and the SCR of the V_PCK is decoded.
The PCI and DSI of _PCK are decoded and supplied to the presentation control circuit 34. The AV decoder 32 has three built-in decoders for independently decoding the audio data, video data, and sub-picture data supplied from the demultiplexer 31, respectively, and performs decoding processing of the corresponding data. . At this time, the buffer 33 is used as a working buffer.

The presentation control circuit 34 provides navigation data supplied from the system controller 24 and data (system parameters) corresponding to user operations by the Asynchronous communication via the AV bus 4.
The demultiplexer 31 and the AV decoder 32 are controlled based on the SCR and the like supplied from the demultiplexer 31. Further, when an operation in a trick play mode such as fast-forward playback, reverse playback, or double-speed playback is designated by a user operation, the decoding unit 6-1.
It is detected that the trick play mode has been designated by the user I / F sub-unit 35 constituting. The user I / F subunit 35 transmits a signal corresponding to a user operation to the user I / F control circuit 26 of the DVD player 1 via the AV bus 4 by asynchronous communication. Thus, the DVD player 1 can be controlled from the digital television receivers 5-1 and 5-2.

FIG. 4 is a block diagram showing a configuration example of the maximum rate control unit 28. Read timing generation circuit 41
(Detection means, comparison means) calculates the current transmission rate and, based on the calculation result, the drive controller 42
The system controller 24 is controlled via (control means), and the transmission of commands to the read / write controller 43 is controlled.

The drive controller 42 supplies a control signal to the system controller 24 based on a command from the read timing generation circuit 41. The read / write controller 43 controls reading of data from the memory 44 based on a command from the read timing generation circuit 41.
The memory 44 temporarily stores presentation data supplied via the switch 30.

The PES header analysis unit 46 analyzes the PES header in the presentation data and performs PTS (Presentati
on Time Stamp) and DTS (Decoding Time Stamp)
The data is supplied to the TS / DTS calculation circuit 47. SC
The R (System Clock Reference) generation circuit 49 generates the STC (Sy
An SCR is generated based on the STC generated by the stem time clock (generating circuit 48).

The PTS / DTS calculation circuit 47 includes an SCR generation circuit 49
A predetermined fixed amount is added to the SCR generated by
A TS is newly generated. In addition, PTS / DTS is calculated for each picture.

The SCR / PTS / DTS insertion unit 45 (change means)
The SCR of the pack header is replaced with the SC generated by the SCR generation circuit 49.
R and replace PTS / DTS in the PES header with PTS / D
After being replaced with the PTS / DTS generated by the TS calculation circuit 47, the PTS / DTS is output.

Next, the operation will be described. In the DVD player 1, the DVD 21 is
When the regeneration of the motor is commanded, the spindle motor (not shown)
D21 is rotated at a predetermined speed. At this time, the pickup 22 accesses a predetermined track of the DVD 21 and
The data recorded there is reproduced. The reproduced data is sent from the pickup 22 to the ECC & Seamless control circuit 2
3 is supplied to the switch 30 and subjected to error processing.
, Is supplied to the VBR control circuit 27. On the other hand, of the reproduced data, the navigation data is supplied to the system controller 24.

The VBR control circuit 27 performs variable rate control on the presentation data. That is, the timing at the time of encoding is restored, and the data is supplied to the decoding unit 3 of the DVD player 1 according to the timing, and transmitted to the digital television receivers 5-1 and 5-2 via the AV bus 4. Therefore, the decoding unit 3 of the DVD player 1 can decode the data immediately after the data is supplied, and can suppress underflow and overflow of the buffer 13. Similarly, digital television receivers 5-1 and 5
The -2 decoding units 6-1 and 6-2 can also decode the data immediately after the data arrives via the AV bus 4, and can suppress underflow and overflow of the buffer 33.

When the data whose rate is controlled by the VBR control circuit 27 is transmitted via the AV bus 4, the data is transmitted as it is on an isochronous channel using MPEG2-PS, and the PS / TS conversion circuit 29 outputs After converting to TS, the data may be transmitted via the AV bus 4 on an isochronous channel.

The data supplied from the VBR control circuit 27 to the decoding unit 3 is separated into audio data, video data and sub-picture data,
Respectively. The audio data, video data, and sub-picture data supplied to the AV decoder 12 are independently decoded by decoders corresponding to each data contained in the AV decoder 12, and output. At that time, the buffer 13 is used as a working buffer.

The data supplied from the VBR control circuit 27 to the decoding section 6-1 of the digital television receiver 5-1 via the AV bus 4 is supplied to the demultiplexer 31, where audio data, video data and After being separated into sub-picture data, it is supplied to the AV decoder 32. Audio data supplied to the AV decoder 32,
The video data and the sub-picture data are each independently decoded by a decoder corresponding to each data contained in the AV decoder 32 and output. then,
The buffer 33 is used as a working buffer. Also, as described later, the presentation control circuit 34
Thereby, the operation timing of the demultiplexer 31 and the AV decoder 32 is controlled.

That is, the navigation data supplied to the system controller 24 from the ECC & Seamless control circuit 23 is transmitted to the AV controller 25 under the control of the navigation manager 25.
The signal is supplied to the decoding unit 6-1 of the digital television receiver 5-1 via the bus 4 by asynchronous communication. Presentation control circuit 3 of decoding section 6-1
Reference numeral 4 denotes a demultiplexer 3 based on navigation data supplied via the AV bus 4 and presentation data supplied from the demultiplexer 31.
1 and the AV decoder 32.

The digital television receiver 5-
2 decoding unit 6-2, as in the case of the decoding unit 6-1 of the digital television receiver 5-1.
The data supplied from the VBR control circuit 27 via the AV bus 4 is subjected to decoding processing and output.

Next, the operation when a trick play mode such as fast forward reproduction, reverse reproduction, and double speed reproduction is instructed by the user will be described. When the user instructs, for example, double-speed playback, a signal corresponding to this operation is supplied to the navigation manager 25 via the user I / F control circuit 26 of the system controller 24. Then, the system controller 24 operates the switch 30 so that the presentation data output from the ECC & Seamless control circuit 23 is supplied to the maximum rate control unit 28.
Switch connection.

In the maximum rate control unit 28, processing as shown in the flowchart of FIG. 5 is executed. First, in step S1, the read timing generation circuit 41 calculates the transmission rate of each pack based on the frequency with which each pack is read from the memory 44. Next, in step S2, based on the transmission rate calculated in step S1, the transmission rate of the data transmitted to the AV bus 4 is the maximum rate (10.08 Mbit / sec (Mbps)) that the AV bus 4 can transmit. It is determined whether it is about to exceed. This is performed, for example, by comparing the calculated transmission rate with a result obtained by subtracting a predetermined value from the maximum rate. When it is determined that the calculated transmission rate is going to exceed the maximum rate, the drive controller 42 is notified of the fact.

In step S3, the drive controller 42 instructs the system controller 24 to stop reading data from the DVD 21. The system controller 24 that has received this instruction controls the pickup 22 to stop reading data from the DVD 21.

In step S4, the read timing generation circuit 41
3 so that a read / write command is not supplied to the memory 44. Thereafter, the process returns to step S1, and the processes after step S1 are repeatedly executed.

On the other hand, in step S2, step S
If it is determined from the transmission rate calculated in step 1 that the transmission rate of the data transmitted to the AV bus 4 is not likely to exceed the maximum rate that the AV bus 4 can transmit, the process proceeds to step S5, and the read timing generation circuit 41 notifies the drive controller 42 of the fact. Upon receiving this notification, the drive controller 42 instructs the system controller 24 to restart reading data from the DVD 21. The system controller 24 that has received this instruction controls the pickup 22 and restarts reading data from the DVD 21.

Next, proceeding to step S6, the read timing generation circuit 41
To output a read timing signal. In step S7, the read / write controller 43
The data read from 1 is written into the memory 44, and the data is read from the memory 44 in accordance with the read timing signal generated by the read timing generation circuit 41 and supplied to the SCR / PTS / DTS insertion unit 45. In trick play modes such as fast-forward playback, reverse playback, and double-speed playback, only I-pictures and P-pictures are stored in the memory 4.
4 is read.

Next, in step S8, based on the clock signal generated by the STC (System Time Clock) generation circuit 48 on the drive side, an SCR (System Clock Reference) is generated.
nce: system reference time reference value)
CR is generated. Next, the process proceeds to step S9, where the PTS (Pre
sentation Time Stamp: playback output time management information) / DTS
(Decoding Time Stamp: Decoding time management information) The calculation circuit 47 adds a predetermined fixed amount to the SCR generated in step S8, and generates PTS / DTS. Further, in step S10, PTS / DT is
S is generated.

In step S11, SCR / PTS / DTS
The insertion unit 45 replaces the SCR of the pack header with the SCR generated by the SCR generation circuit 49. Next, in step S12, the PTS / DTS of the PES header is replaced with the PTS and DTS generated by the PTS / DTS calculation circuit 47 by the SCR / PTS / DTS insertion unit 45.

Then, in step S13, SCR, PT
Presentation data in which S and DTS are replaced with those for double-speed playback is output. Thereafter, the process returns to step S1, and the processes after step S1 are repeatedly executed.

As described above, the maximum rate control unit 28
Sends a control signal to the system controller 24 to instruct the system controller 24 to temporarily stop reading the DVD 21 when it determines that the transmission rate of the output data is going to exceed the transmission band secured in advance on the AV bus 4. On the other hand, when it is determined that the transmission rate of the output data does not exceed the transmission band previously secured in the AV bus 4, the control signal is supplied to the system controller 24 to instruct the system controller 24 to resume reading data from the DVD 21. As a result, rate control can be performed so that the transmission path does not fail.

The presentation data output from the maximum rate control unit 28 is transmitted via the AV bus 4 to the Is data.
The signals are transmitted to the decoders 6-1 and 6-2 of the digital television receivers 5-1 and 5-2 via the ochronous channel and decoded. Decoder 6-1 and 6-2
Is the same as in the case described above, and the description is omitted here.

Here, the instruction to switch from the normal reproduction mode to the trick play mode is made via the user I / F control circuit 26 of the DVD player 1, but the decoding of the digital television receiver 5-1 is performed. It is also possible to perform the processing via one user I / F subunit 35.

For example, when the user instructs double-speed reproduction by an operation unit (not shown) on the decoding unit 6-1 side of the digital television receiver, control data corresponding to the operation by the user is transmitted to the user I / F subunit 35. More AV bus 4
Is transmitted to the system controller 24 of the DVD player 1 by Asynchronous communication via the. The system controller 24 determines the switch 30 based on the control data.
Is controlled so that reproduction data is supplied to the maximum rate control unit 28, and the rotation speed of the DVD 21 is controlled so that the pickup 22 reads out data necessary for double-speed reproduction.

The subsequent operation is the same as in the case described above, and a description thereof will be omitted.

As described above, in the trick play mode,
By performing the maximum rate control, it is possible to prevent the transmission path from breaking down when the reproduction data is transmitted via the transmission path. Thus, data can be transmitted in real time while performing rate control so as not to break down the transmission path.

In the above embodiment, the operation in double-speed reproduction has been described. However, the present invention can be applied to other trick play modes.

In the above embodiment, the case where IEEE 1394 is used as the AV bus 4 has been described. However, IDE (integrated device electronics) and ATAPI (A
T Attachment Packet Interface) or other transmission paths may be used.

Further, in the above embodiment, the DVD
Although the description has been given of the case where data is read from the storage medium, the present invention can be applied to the case where data is read from another recording medium.

[0067]

As described above, according to the recording medium reproducing apparatus according to the first aspect and the recording medium reproducing method according to the third aspect, the data recorded on the recording medium can be read in the normal reproduction mode and the variable speed reproduction mode. When the data recorded on the recording medium is reproduced in the variable speed reproduction mode, the processing is switched so that the data reproduced from the recording medium is transmitted to the transmission path with the transmission rate being limited to a predetermined transmission rate or less. With this configuration, it is possible to prevent the transmission path from being broken during variable speed reproduction.

According to the recording medium reproducing apparatus according to the fourth aspect and the recording medium reproducing method according to the sixth aspect, the data recorded on the recording medium is reproduced in the normal reproduction mode and the variable speed reproduction mode. When reproducing data recorded on a medium in a variable speed reproduction mode, the data reproduced from the recording medium is temporarily held before being transmitted to a transmission path, and a time stamp of the data is changed according to the variable speed reproduction mode. As a result, decoding can be performed in accordance with the time stamp even during variable speed reproduction.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an AV system to which a recording medium reproducing device of the present invention is applied.

FIG. 2 is a block diagram illustrating an example of the internal configuration of a DVD player 1 and a decoding unit 6-1.

FIG. 3 is a diagram for explaining recorded contents of a DVD 21;

4 is a block diagram illustrating a configuration example of a maximum rate control unit 28. FIG.

FIG. 5 is a flowchart illustrating an operation of a maximum rate control unit 28;

[Explanation of symbols]

1 DVD player, 2 drive unit, 3 decoding unit, 4 AV bus, 5-1 and 5-2 digital television receiver, 6-1 and 6-2 decoding unit, 21
DVD, 22 pickup, 24 system controller, 25 navigation manager, 26 user I / F control circuit, 27 VBR control circuit, 28 maximum rate control unit, 29 PS / TS conversion circuit, 30 switch, 41 read timing generation circuit, 42 drive Controller, 43 read / write controller,
44 memory, 45 SCR / PTS / DTS insertion part, 46 P
ES header analysis unit, 47 PTS / DTS calculation circuit, 48 S
TC generation circuit, 49 SCR generation circuit

Claims (6)

[Claims] 1. A recording medium reproducing apparatus for reproducing encoded data from a recording medium and transmitting the encoded data to a decoding apparatus for decoding data transmitted via a transmission path, wherein the data is recorded on the recording medium. Reproducing means for reproducing data in a normal reproduction mode and a variable speed reproduction mode, temporarily holding data reproduced from the recording medium before transmitting the data to the transmission path, and according to a timing at the time of encoding the data, First transmission means for transmitting the data to the transmission line, temporarily storing data reproduced from the recording medium before transmitting the data to the transmission line, and limiting the data to a predetermined transmission rate or less. A second transmission means for transmitting the data reproduced from the recording medium to the transmission path by using any one of the first transmission means and the second transmission means. And a switching means for switching to be handled by people, the switching means, when reproducing the data which the reproduction means is recorded on the recording medium in variable speed reproduction mode,
A recording medium reproducing apparatus, wherein switching is performed so that data reproduced from the recording medium is processed by the second transmission unit. 2. A detecting means for detecting a transmission rate of the data transmitted to the transmission line, a comparing means for comparing the transmission rate detected by the detecting means with a predetermined reference value, 2. The recording medium reproducing apparatus according to claim 1, further comprising control means for controlling reproduction of the data from the recording medium by the reproducing means based on the comparison result. 3. A recording medium reproducing method for reproducing encoded data from a recording medium and transmitting the encoded data to a decoding device for decoding data transmitted through a transmission path, wherein the data is recorded on the recording medium. A reproduction step of reproducing data in a normal reproduction mode and a variable-speed reproduction mode, and temporarily holding data reproduced from the recording medium before transmitting the data to the transmission path, and in accordance with a timing at the time of encoding the data, A first transmission step of transmitting the data to the transmission line, and temporarily holding data reproduced from the recording medium before transmitting the data to the transmission line, limiting the data to a predetermined transmission rate or less. A second transmission step of transmitting the data recorded on the recording medium in the variable speed reproduction mode. Recording medium reproducing method in which data reproduced from the body, characterized in that it comprises a switching step of switching to be processed by the second transmission step. 4. A recording medium reproducing apparatus for reproducing encoded data from a recording medium and transmitting the encoded data to a decoding apparatus for decoding data transmitted via a transmission path, wherein the data is recorded on the recording medium. Reproducing means for reproducing data in a normal reproduction mode and a variable speed reproduction mode; and when the reproducing means reproduces data recorded on the recording medium in a variable speed reproduction mode, the reproduction means reproduces the data reproduced from the recording medium through the transmission path Recording means for temporarily storing the data before transmission to the recording medium, and changing the time stamp of the data in accordance with the variable speed reproduction mode. 5. A detecting means for detecting a transmission rate of the data transmitted to the transmission path, a comparing means for comparing the transmission rate detected by the detecting means with a predetermined reference value, and 5. The recording medium reproducing apparatus according to claim 4, further comprising control means for controlling reproduction of said data from said recording medium by said reproducing means based on the comparison result. 6. A recording medium reproducing method for reproducing encoded data from a recording medium and transmitting the encoded data to a decoding device for decoding data transmitted through a transmission path, wherein the data is recorded on the recording medium. A reproducing step of reproducing data in a normal reproducing mode and a variable speed reproducing mode; and when reproducing data recorded on the recording medium in a variable speed reproducing mode, before transmitting the data reproduced from the recording medium to the transmission path. Changing the time stamp of the data in accordance with the variable speed reproduction mode.