JP2003333533A - Video audio signal reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video audio signal reproducing apparatus wherein an AV decoder and a transport stream decoder can reproduce a video frame of a TS packet for particular reproduction without causing a defect to a ring buffer. <P>SOLUTION: The video audio signal reproducing apparatus is provided with: the ring buffer; a discrimination means for discriminating whether the TS packet is a packet for ordinary reproduction or a packet for particular reproduction; the AV decoder; a first packet supply means for supplying the TS packet outputted from the first address to the AV decoder; and a second packet supply means for supplying the TS packet outputted from a second address to the transport stream decoder according to TS timing information, and when the discrimination means discriminates that the TS packet is a packet for particular reproduction, the TS packet outputted from the first address is supplied to the AV decoder according to the TS timing information. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio signal reproducing device, and more particularly to a video / audio signal for decoding and reproducing a plurality of TS packets in which a plurality of encoded video frames are packetized according to the MPEG transport stream system. The present invention relates to a signal reproducing device.

[0002]

2. Description of the Related Art MPEG system standard (ISO / IEC
The MPEG transport stream system defined in 13818-1) is widely used in broadcasting as a system for multiplexing encoded video and audio streams.

FIG. 7 is a block diagram of a conventional video / audio signal reproducing apparatus 90 which decodes and reproduces a plurality of TS packets in which a plurality of encoded video frames are packetized according to the MPEG transport stream system.
The video / audio signal reproducing device 90 includes a ring buffer 8. The ring buffer 8 reads each TS read from the recording medium 7 in which a plurality of TS packets and TS timing information corresponding to each of the plurality of TS packets are recorded.
The packet and the TS timing information corresponding to each TS packet are stored respectively.

FIG. 8 is a diagram for explaining the relationship between the TS packet 3 and the TS timing information 4 respectively recorded on the recording medium 7 and the video elementary stream 41 constituted by the encoded video frame 6. Is. In the plurality of TS packets 3 recorded in the recording medium 7, a plurality of encoded video frames 6 are packetized according to the MPEG transport stream system. The TS timing information 4 corresponding to each TS packet 3 is information related to the timing for transmitting each TS packet 3 according to a virtual decoder model called a T-STD model.

The video elementary stream 41 is an MP
It is encoded in accordance with the EG video standard (ISO / IEC13818-2), and has a plurality of GOPs (Group O).
fPicture). Each GOP has a plurality of coded video frames 6. In the MPEG video standard, inter-frame coding is performed by using motion compensation, so that a plurality of video frames 6 are collectively coded into a group called GOP. At the beginning of each encoded video frame 6, a picture header 44 representing a unique code having a size of at least 32 bits.
Are provided respectively. Therefore, by detecting the picture header 44, the boundary between the plurality of video frames 6 can be detected.

A video elementary stream 41 composed of a plurality of GOPs having a plurality of coded video frames 6 is divided into arbitrary lengths, and each is divided into a packet data section 46 provided in each PES packet 42. Is stored. In front of each packet data section 46, PES
Headers 45 are provided respectively. PES header 4
A packet start code, PTS, and DTS are stored in 5. The packet start code is a unique code having a size of 32 bits. PTS indicates the display time of the video frame 6 stored in the packet data section 46, and DTS indicates its decoding time. PES
The header 45 is further provided with a DSM trick mode flag and a DSM trick mode field.
The DSM trick mode flag is set when the video elementary stream 41 is a stream for special reproduction. In the DSM trick mode field, information for designating special reproduction modes such as slow reproduction and high speed reproduction in forward / reverse direction is recorded.

The PES packet 42 is divided into TSs.
Each is stored in packet 3. Each TS packet 3
Has a TS header 55 and a payload section 56, respectively. Each TS packet 3 has a fixed length of 188 bytes. The TS header 55 provided in the TS packet 3 has a variable length. Each of the divided PES packets 42 is stored in the payload part 56 provided in each TS packet 3. Therefore, the PES packet 42 is
The total data length of the variable length TS headers 55 is divided into 188 bytes, which is the entire fixed length of the TS packet 3, and stored in the payload portion 56 provided in the TS packet 3. .

The TS header 55 provided in each TS packet 3 includes a 1-byte sync signal indicating the beginning of each TS packet 3 and the payload section 5 provided in each TS packet 3.
A PID that is a 13-bit stream identification signal indicating the type of the video elementary stream stored in 6 and a receiver that has received the transport stream composed of each TS packet 3 are transmitters that have transmitted the transport stream. And PCR, which is information for generating a clock synchronized with the system clock provided in.

A plurality of TS packets 3 and TS timing information 4 configured as described above are recorded on the recording medium 7, respectively.

The plurality of TS packets 3 recorded on the recording medium 7 may be normal reproduction TS packets or special reproduction TS packets. First, the TS packet for normal reproduction is recorded on the recording medium 7, and the operation of the conventional audiovisual signal reproducing apparatus 90 for normally reproducing the TS packet for normal reproduction recorded on the recording medium 7 will be described.

Referring again to FIG. 7, the ring buffer 8
In this area, the normal reproduction TS packet read from the recording medium 7 and the corresponding TS timing information are stored.
The ring buffer 8 is also provided with a first read pointer and a second read pointer that respectively indicate the addresses where the TS packets read from the recording medium 7 are stored. In response to the packet request signal 83 from the first packet supply circuit 91, the ring buffer 8 stores the normal reproduction TS packet stored at the first address designated by the first read pointer and the corresponding TS timing information as the first TS packet. Output to the packet supply circuit 91.
In response to the packet request signal 14 from the second packet supply circuit 9, the ring buffer 8 also outputs the normal reproduction TS packet and the corresponding TS timing information stored at the second address designated by the second read pointer. 2 Output to the packet supply circuit 9.

The second packet supply circuit 9 outputs the normal reproduction TS packet output from the second address to the DIF processing circuit 10 according to the TS timing information output from the second address designated by the second read pointer. To do. The DIF processing circuit 10 receives the normal reproduction TS packet output from the second address from the second packet supply circuit 9, and DI provided in the DIF processing circuit 10
DI based on IEEE 1394 connected to F terminal 15
The normal reproduction TS packet is transmitted in the synchronous transfer mode to the transport stream decoder 11 connected to the video / audio signal reproducing device 90 via the F cable 16.

Transport stream decoder 11
Is the TS header 5 provided in the normal reproduction TS packet.
On the basis of the PCR stored in 5, the clock for synchronizing with the system clock provided in the audio / video signal reproducing device 90 which has transmitted the TS packet for normal reproduction is generated, and based on the generated clock, the TS packet for normal reproduction is generated. The packetized video frame is extracted and decoded, and the decoded video frame is normally reproduced.

FIG. 9 is a diagram for explaining a video frame reproduced based on the normal reproduction TS packet recorded on the recording medium 7. The video frame group 45 shows a mode in which the video frames normally reproduced by the transport stream decoder 11 based on the TS packets for normal reproduction recorded in the recording medium 7 are arranged in the order of display. Reference numerals I, P, and B, which constitute the reference code attached to each video frame, indicate a method of encoding the video frame to which the reference code is attached. The code I indicates that the video frame is M
It indicates that the picture frame is an I picture in the PEG system, the code P indicates that the video frame is a P picture, and the code B indicates that the video frame is a B picture. The number following each code I, P and B indicates the order in which the video frame is displayed. For example, the video frame I2 indicates that the video frame is an I picture and is the second video frame to be displayed, and the video frame B3 is the B picture and the third video frame to be displayed third. The video frame P5 indicates that the video frame is a P picture and is the fifth video frame to be displayed.

In the video frame group 45 normally reproduced based on the TS packet for normal reproduction, one I picture (for example, video frame I2) is displayed and then 2
A number of B-pictures (eg video frames B3 and B
4) are continuously displayed, and then one P picture (for example, video frame P5) is displayed. 2 like this
After the display of one P picture after the display of one B picture is repeated four times, two B pictures (for example, video frames B15 and B16) are displayed. Then, the I picture (for example, the video frame I17) is displayed again. In this way, in the video frame group 45 normally reproduced based on the TS packet for normal reproduction, I pictures are displayed every 15 frames.

In accordance with the packet request signal 17 from the AV decoder 5, the first packet supply circuit 91 outputs the normal reproduction TS packet output from the first address designated by the first read pointer provided in the ring buffer 8. Output to the AV decoder 5. The AV decoder 5 extracts and decodes the video frame packetized in the TS packet for normal reproduction output from the first address, and, like the transport stream decoder 11, as shown in the video frame group 45 of FIG. The video frame is decoded and played normally.

Since the clock for the transport stream decoder 11 to decode the video frame is generated based on the PCR stored in the TS header 55 provided in the normal reproduction TS packet, the transport stream decoder 11 The clock used for decoding the video frame is synchronized with the clock used for decoding the video frame by the AV decoder 5. Therefore, the second address of the second read pointer for instructing the normal reproduction TS packet output from the ring buffer 8 to the second packet processing circuit 9 and the normal output from the ring buffer 8 to the first packet processing circuit 91. The first address of the first read pointer that indicates the reproduction TS packet changes while holding a predetermined offset width. Therefore,
The ring buffer 8 never breaks.

Next, the operation of the conventional video / audio signal reproducing apparatus 90 for high speed reproduction of the video frame packetized in the TS packet for normal reproduction recorded on the recording medium 7 will be described.

The second packet supply circuit 9 performs high speed reproduction according to the instructed high speed reproduction speed from the plurality of normal reproduction TS packets output from the second address specified by the second read pointer. The normal reproduction TS packet in which the video frame necessary for the packetization is extracted, and the PEs packetized in the payload parts 56 respectively provided in the extracted normal reproduction TS packets
By setting the DSM trick mode flags of the S header 45 respectively and storing the information for designating the high speed reproduction in the forward direction in the DSM trick mode field, a plurality of TSs for normal reproduction outputted from the second address can be obtained.
The packet is converted into a plurality of special reproduction TS packets set in the DSM trick mode.

The second packet supply circuit 9 also recalculates the timing for transmitting the special reproduction TS packet set in the DSM trick mode according to the T_STD model, and based on the result, the DSM trick mode is set. The set special reproduction TS packet is output to the DIF processing circuit 10. The DIF processing circuit 10 uses the DIF
A video / audio signal reproducing device 90 via a DIF cable 16 connected to a DIF terminal 15 provided in the processing circuit 10.
Transport stream decoder 11 connected to
To the special reproduction TS packet.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. When the transport stream decoder 11 identifies that the received TS packet is the special reproduction TS packet,
The video frame being displayed is repeatedly displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. When the transport stream decoder 11 further receives the special reproduction TS packet in which the next video frame is packetized, the transport stream decoder 11 decodes the next video frame and updates the currently displayed video frame to the next video frame. In this way, the transport stream decoder 11 reproduces the video frame at a high speed of, for example, 3 times based on the special reproduction TS packet.

In the video frame group 46 shown in FIG. 9, the video frames decoded by the transport stream decoder 11 based on the special reproduction TS packet converted from the normal reproduction TS packet 3 by the second packet supply circuit 9 are
It shows a mode in which they are arranged in the order in which they are displayed at triple speed. In the example of the video frame group 46, the second packet supply circuit 9 extracts a TS packet in which a video frame (video frame I2, I17, ...) That is an I picture is stored from the TS packet for normal playback and performs special playback. Output as a TS packet. The transport stream decoder 11 uses the I-pictures (video frames I2, I17, I32, I49, ...
.) Is repeatedly displayed and the number of times of repeated display is adjusted (5 times in the example of the video frame group 46 shown in FIG. 9), so that the video frame is tripled in speed with respect to the normally played video frame group 45. Play fast. Since there is no clear regulation on the function of the transport stream decoder 11 connected to the video / audio signal reproducing device 90 for special reproduction of the TS packet, the video frame group 46.
It is common to simply perform special playback using only I pictures, as in the example.

The AV decoder 5 generates a video frame required for high speed reproduction from the plurality of normal reproduction TS packets supplied from the first packet supply circuit 91 in accordance with the instructed high speed reproduction speed. The packetized TS packets are extracted, and the extracted TS packets are sequentially decoded and displayed.

The video frame group 47 shown in FIG. 9 shows a mode in which the video frames decoded by the AV decoder 5 based on the normal reproduction TS packet are arranged in the order of displaying at triple speed. In the example of the video frame group 47 shown in FIG.
The decoder 5 receives all I from the TS packet for normal reproduction.
Picture and all P-pictures (video frame I
2, P5, P8, P11, P14, I17, ...), and by decoding all the extracted I pictures and all P pictures and displaying them in order,
Similar to the video frame group 46 shown in FIG. 9, the video frames are reproduced at a speed three times that of the normally reproduced video frame group 45.

As described above, since the AV decoder 5 has the trick play function of extracting all I pictures and P pictures from the normal reproduction TS packet and displaying them in order, only the I pictures from the normal reproduction TS packet are displayed. By adjusting the number of times the extracted I-pictures are repeatedly displayed, it is possible to obtain a special reproduction image that is better than that of the transport stream decoder 11 that simply performs special reproduction.

[0026]

However, when the TS packet 3 recorded on the recording medium 7 is not the normal reproduction TS packet but the special reproduction TS packet, the audiovisual signal reproduction described above with reference to FIG. 7 is performed. The device 90 has the following problems.

The ring buffer 8 has a special reproduction TS packet read from the recording medium 7 and a corresponding TS.
Timing information is stored. In response to the packet request signal 83 from the first packet supply circuit 91, the ring buffer 8 also sends the special reproduction TS packet stored at the first address designated by the first read pointer to the first packet supply circuit 91. Output. Ring buffer 8
Further, in response to the packet request signal 14 from the second packet supply circuit 9, the special reproduction TS packet and the TS timing information stored at the second address designated by the second read pointer are provided to the second packet supply circuit 9 Output to.

The second packet supply circuit 9 outputs the TS output from the second address designated by the second read pointer, as in the case of the normal reproduction TS packet described above.
According to the timing information, the special reproduction TS packet output from the second address is output to the DIF processing circuit 10. The DIF processing circuit 10 receives the special reproduction TS packet output from the second address from the second packet supply circuit 9, and transmits the video via the DIF cable 16 connected to the DIF terminal 15 provided in the DIF processing circuit 10. The special reproduction TS packet is output to the transport stream decoder 11 connected to the audio signal reproduction device 90.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. The transport stream decoder 11 also repeatedly displays the video frame being displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. The transport stream decoder 11 further includes
When the reception of the special reproduction TS packet in which the next video frame is packetized is completed, the next video frame is decoded and the video frame being displayed is updated to the next video frame.

FIG. 10 is a diagram for explaining a video frame reproduced based on the special reproduction TS packet recorded on the recording medium 7. The video frame group 48 is the recording medium 7
2 shows a mode in which the video frames decoded by the transport stream decoder 11 are arranged in the order of being displayed at 3 × speed based on the special reproduction TS packet recorded in FIG. A special reproduction TS in which the normal reproduction TS packet output from the second address is set to the DSM trick mode
Similar to the case where the second packet supply circuit 9 converts the packet, the transport stream decoder 11
In this case, since a TS packet is transmitted based on the TS timing information, the transport stream decoder 11 displays the video frame decoded based on the special reproduction TS packet recorded on the recording medium 7 at triple speed. The video frame group 48 showing the mode displays the video frames decoded by the transport stream decoder 11 at triple speed based on the special reproduction TS packet converted from the normal reproduction TS packet by the second packet supply circuit 9. The result is similar to that of the video frame group 46 described above.

In accordance with the packet request signal 17 from the AV decoder 5, the first packet supply circuit 91 outputs the special reproduction TS packet output from the first address designated by the first read pointer provided in the ring buffer 8. Output to the AV decoder 5. The AV decoder 5 extracts and decodes the video frame packetized in the special reproduction TS packet output from the first address.

The video frame group 98 shown in FIG. 10 shows a mode in which the video frames decoded by the AV decoder 5 based on the special reproduction TS packets recorded on the recording medium 7 are arranged in the order of display. The AV decoder 5 attempts to extract all I-pictures and P-pictures from the special-playback TS packet by the special reproduction function described above, and sequentially decode and display all the extracted I-pictures and P-pictures. However, the trick play TS packet set in the DSM trick mode is configured by extracting only the TS packet in which the I picture is stored from the normal play TS packet and extracting the TS packet. Therefore, only the I picture is stored in the trick play TS packet, and the P picture is not stored. Therefore, the AV decoder 5 uses the special reproduction TS.
Since the video frame decoded from the packet is only the I picture, the video frame group 98 includes the I picture video frame I2 and the I picture video frame I17 as the video frame group 47 described with reference to FIG. Between P picture frames P5, P8, P11 and P
14 is not displayed at 3 × speed, but 15 × speed at which the I-picture video frame I2 is displayed immediately after the I-picture video frame I2 is displayed.

As described above, the video frame group 48 decoded by the transport stream decoder 11 is displayed at 3 × speed, whereas the video frame group 98 decoded by the AV decoder 5 is displayed at 15 × speed. As a result, the second address of the second read pointer indicating the TS packet for trick play output from the ring buffer 8 to the transport stream decoder 11 via the second packet processing circuit 9, and the first address from the ring buffer 8 Special reproduction T output to the AV decoder 5 via the processing circuit 91
Since the first address of the first read pointer that points to the S packet becomes farther away as the reproduction is continued,
There is a problem that the ring buffer 8 may be broken.

The present invention has been made to solve the above problems, and an object thereof is an AV decoder that does not break a ring buffer to break a video frame packetized into a TS packet for special reproduction recorded on a recording medium. Another object of the present invention is to provide a video / audio signal reproducing device which can be reproduced by a transport stream decoder.

Another object of the present invention is a video / audio capable of synchronizing the reproduction in the AV decoder and the reproduction in the transport stream decoder of the video frame packetized in the special reproduction TS packet recorded on the recording medium. It is to provide a signal reproducing device.

[0036]

A video / audio signal reproducing apparatus according to the present invention uses a plurality of coded video frames as an MP.
A plurality of TS packets packetized according to the EG transport stream method and each TS packet are T-STD
A ring buffer for storing each TS packet reproduced from a recording medium on which TS timing information related to the timing for transmitting according to the model is recorded and TS timing information corresponding to each TS packet, and the recording. Discriminating means for discriminating whether the TS packet reproduced from the medium is a normal reproduction packet or a special reproduction packet, and a first pointer designated by a first pointer provided in the ring buffer.
An AV decoder provided for decoding the video frame packetized into a TS packet output from an address, a TS packet and TS timing information output from the first address, and output from the first address A first packet supplying means for supplying the TS packet to the AV recorder and a TS packet and TS timing information output from a second address designated by a second pointer provided in the ring buffer, According to the TS timing information output from the two addresses, the TS packet output from the second address is transferred to the digital interface (DIF).
T output from the second address via the processing means
A second packet supply means for supplying to the transport stream decoder provided for decoding the video frame packetized into S packets,
When the determination unit determines that the TS packet is the normal reproduction packet, the first packet supply unit outputs the first packet according to the packet request signal from the AV decoder from the first address. When the TS packet is supplied to the AV decoder and the TS packet is determined to be the packet for special reproduction, the first TS packet is supplied according to the TS timing information output from the first address. The TS packet output from the address is supplied to the AV decoder.

For this reason, the special reproduction TS packet supplied to the AV decoder is supplied to the transport stream decoder when the determining unit determines that the TS packet is the special reproduction TS packet.
Like the S packet, it is supplied to the AV decoder according to the TS timing information. Therefore, the second address designated by the second pointer provided in the ring buffer is
As in the above-described conventional configuration, the TS packet for the special reproduction which changes in correlation with the first address designated by the first pointer and supplies the special reproduction TS packet in response to a request from the AV decoder is used. The address and the first address are not separated as the reproduction is continued.
As a result, reproduction can be continued without the ring buffer being broken.

Another video / audio signal reproducing apparatus according to the present invention transmits a plurality of TS packets obtained by packetizing a plurality of encoded video frames according to the MPEG transport stream system and each TS packet according to the T-STD model. Related to the timing for each
A ring buffer in which each TS packet read from a recording medium in which timing information is recorded and TS timing information corresponding to each TS packet are respectively stored, and the T buffer read from the recording medium.
Discriminating means for discriminating whether the S packet is a packet for normal reproduction or a packet for special reproduction, and a TS packet output from the first address designated by the first pointer provided in the ring buffer. A provided for decoding the packetized video frame
The V decoder and the TS packet output from the first address are received, and the T packet output from the first address is received.
A first packet supplying means for supplying an S packet to the AV decoder, and a T output from a second address designated by a second pointer provided in the ring buffer.
The S packet and the TS timing information are received, and the TS packet output from the second address is output according to the TS timing information output from the second address.
Second packet supply means for supplying via a DIF processing means to a transport stream decoder provided for decoding the video frame packetized into TS packets output from the second address, and the first address Based on at least one of the TS packet output from the first packet supply unit and the TS packet output from the second address, the TS packet supplied from the first packet supply unit to the AV decoder from the second packet supply unit. And a sync control circuit for generating a sync control signal for synchronizing with the TS packet supplied to the transport stream decoder, wherein the first packet supply means is the normal reproduction of the TS packet by the discrimination means. If it is determined that the packet is for
In response to a packet request signal from the AV decoder, the TS packet output from the first address is transferred to the AV
When the TS packet is supplied to a decoder and the TS packet is determined to be the special reproduction packet by the determining means, the TS packet is output from the first address based on the synchronization control signal generated by the synchronization control circuit. The T
The S packet is supplied to the AV decoder.

Therefore, when the discriminating means discriminates that the TS packet is a packet for special reproduction, the first packet supplying means outputs the AV signal from the first packet supplying means.
The TS packet output from the first address is AV based on the synchronization control signal for synchronizing the TS packet supplied to the decoder with the TS packet supplied from the second packet supply means to the transport stream decoder.
Supply to the decoder. Therefore, since the TS packet supplied from the first packet supply means to the AV decoder and the TS packet supplied from the second packet supply means to the transport stream decoder are synchronized, an instruction is given by the second pointer provided in the ring buffer. The second address to be reproduced fluctuates in correlation with the first address designated by the first pointer, so that the second address and the first address continue reproduction as in the above-described conventional configuration. It's never going away. As a result, reproduction can be continued without the ring buffer being broken.

The synchronization control circuit, when detecting a boundary between the plurality of video frames from the TS packet output from the first address, notifies the first video frame boundary for notifying that the boundary has been detected. A first video frame boundary detection means for generating a detection signal; and, when detecting a boundary between the plurality of video frames from the TS packet output from the second address, for notifying that the boundary has been detected. Second video frame boundary detection means for generating a second video frame boundary detection signal; and the first packet supply means based on the first video frame boundary detection signal and the second video frame boundary detection signal.
It may have a TS packet supply instruction means for outputting a signal for permitting or prohibiting the supply of the TS packet to the V decoder as the synchronization control signal to the first packet supply means.

When the TS packet supply instruction means receives the second video frame boundary detection signal, the TS packet supply indicating the TS packet supply indicating the permission to supply the TS packet output from the first address to the AV decoder. When the synchronization control signal is changed to the enable state and the first video frame boundary detection signal is received, TS packet supply indicating prohibition of supplying the TS packet output from the first address to the AV decoder The synchronization control signal is changed to the prohibition state, and the first packet supply means outputs the T output from the first address during the period when the synchronization control signal is in the TS packet supply permission state.
S packets may be supplied to the AV decoder.

The synchronization control circuit outputs a video frame boundary detection signal each time a boundary between the plurality of video frames is detected from the TS packet output from the second address, and video frame boundary detection means, and Based on a time interval between the video frame boundary detection signals output from the video frame boundary detection means and a predetermined display cycle for displaying the video frame, a signal indicating the number of times the video frame is repeatedly displayed is displayed. A display control unit that outputs a synchronization control signal to the first packet supply unit, wherein the first packet supply unit is represented by the synchronization control signal output from the display count determination unit. The TS packet output from the first address is supplied to the AV decoder for a period corresponding to the number of times of repeated display. The feeding may be stopped.

Still another video / audio signal reproducing apparatus according to the present invention transmits a plurality of TS packets obtained by packetizing a plurality of encoded video frames according to the MPEG transport stream system and each TS packet according to the T-STD model. A ring buffer for storing each TS packet read from a recording medium on which TS timing information related to each timing for recording and TS timing information corresponding to each TS packet are respectively stored; Discriminating means for discriminating whether the TS packet read from the medium is a normal reproduction packet or a special reproduction packet, and a first address designated by a first pointer provided in the ring buffer. The packetized TS packet output from The AV decoder provided for decoding the frame, output from the first address T
The T packet output from the first address is received in response to the packet request signal from the AV decoder.
A first packet supplying means for supplying an S packet to the AV decoder, and a T output from a second address designated by a second pointer provided in the ring buffer.
The S packet and the TS timing information are received, and the TS packet output from the second address is output according to the TS timing information output from the second address.
Second packet supply means for supplying via a DIF processing means to a transport stream decoder provided for decoding the video frame packetized into TS packets output from the second address, and the first address Based on at least one of the TS packet output from the first packet supply unit and the TS packet output from the second address, the TS packet supplied from the first packet supply unit to the AV decoder from the second packet supply unit. And a sync control circuit for generating a sync control signal for synchronizing with the TS packet supplied to the transport stream decoder, wherein the AV decoder determines that the TS packet is the special reproduction packet. If it is determined that the Based on the made the said synchronization control signal, and outputs the packet request signal requesting the TS packets outputted from the first address to the first packet supply means.

Therefore, if the discriminating means discriminates that the TS packet is a special reproduction packet, A
The V decoder supplies the first address based on a synchronization control signal for synchronizing the TS packet supplied from the first packet supply means to the AV decoder with the TS packet supplied from the second packet supply means to the transport stream decoder. A packet request signal for requesting the TS packet output from the first packet supply unit is output. As a result, the first packet supply circuit outputs the TS packet in accordance with only the packet request signal from the AV decoder.
Even when supplied to the decoder, the video frame packetized into TS packets can be reproduced by the AV decoder and the transport stream decoder without the ring buffer unlocking.

When the sync control circuit detects a boundary between the plurality of video frames from the TS packet output from the first address, the first video frame boundary for notifying that the boundary has been detected. A first video frame boundary detection means for generating a detection signal; and, when detecting a boundary between the plurality of video frames from the TS packet output from the second address, for notifying that the boundary has been detected. Second video frame boundary detection means for generating a second video frame boundary detection signal, and a TS output from the first address based on the first video frame boundary detection signal and the second video frame boundary detection signal
A TS packet supply instructing means for outputting a signal for permitting or prohibiting requesting a packet to the first packet supplying means to the AV decoder as the synchronization control signal may be included.

When the TS packet supply instruction means receives the second video frame boundary detection signal, the AV decoder requests the TS packet output from the first address from the first packet supply means. When the synchronization control signal is changed to the TS packet request permission state indicating permission to perform, and the first video frame boundary detection signal is received, the TS output from the first address
Packets to the first packet supply means by the AV
The synchronization control signal is changed to a TS packet request prohibition state indicating prohibition of request by the decoder, and the AV decoder is configured to change the synchronization control signal to the first address during the period in which the synchronization control signal is in the TS packet request permission state. The packet request signal for requesting the TS packet output from the first packet supply unit may be output.

The sync control circuit outputs a video frame boundary detection signal each time a boundary between the plurality of video frames is detected from the TS packet output from the second address, and video frame boundary detection means, and Based on a time interval between the video frame boundary detection signals output from the video frame boundary detection means and a predetermined display cycle for displaying the video frame, a signal indicating the number of repeated display of the video frame is synchronized. A display number discriminating means for outputting to the AV decoder as a control signal, and the AV decoder has a period corresponding to the repetitive display number represented by the synchronization control signal outputted from the display number discriminating means. During this period, the TS packet output from the first address is requested to the first packet supply means. It may be stopped.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION In the video / audio signal reproducing apparatus according to the first to third embodiments, a video frame packetized into a TS packet for special reproduction recorded on a recording medium,
In the AV decoder provided in the video / audio signal reproducing device and the transport stream decoder connected to the video / audio signal reproducing device, reproduction can be performed without breaking the ring buffer.

(First Embodiment) FIG. 1 is a block diagram of a video / audio signal reproducing apparatus 100 according to the first embodiment.
The video / audio signal reproducing apparatus 100 includes a ring buffer 8. The ring buffer 8 includes a plurality of TS packets read from the recording medium 7 in which the plurality of TS packets 3 and the TS timing information 4 corresponding to each of the plurality of TS packets 3 described above with reference to FIG. 8 are recorded. 3 and TS
The timing information 4 is stored respectively. The ring buffer 8 stores TS packets 3 read from the recording medium 7.
And a first read pointer and a second read pointer which respectively indicate an address in which the corresponding TS timing information 4 is stored.

As described above in the prior art, the plurality of TS packets 3 recorded on the recording medium 7 may be normal reproduction TS packets or special reproduction TS packets. In the video / audio signal reproducing circuit 100,
It is determined whether the TS packet read from the recording medium 7 is a normal reproduction TS packet or a special reproduction TS packet, and a determination signal 12 indicating the determination result is output to the first packet supply circuit 1. A circuit 2 is provided.

First, the operation of the video / audio signal reproducing apparatus 100 for high-speed reproduction of the video frame 6 packetized in the normal reproduction TS packet in which the normal reproduction TS packet is recorded in the recording medium 7 will be described. .

The ring buffer 8 stores the normal reproduction TS packet read from the recording medium 7 and the corresponding TS timing information. In response to the packet request signal 13 from the first packet supply circuit 1, the ring buffer 8 also stores the normal reproduction TS packet and the corresponding TS timing information stored at the first address designated by the first read pointer. 1 output to the packet supply circuit 1. In response to the packet request signal 14 from the second packet supply circuit 9, the ring buffer 8 further outputs the normal reproduction TS packet stored at the second address designated by the second read pointer and the corresponding TS timing information. 2 Output to the packet supply circuit 9.

The second packet supply circuit 9 performs high-speed reproduction according to the instructed high-speed reproduction speed from the plurality of normal reproduction TS packets output from the second address specified by the second read pointer. DSM of the PES header 45 packetized into a payload part 56 provided in each of the extracted TS packets for normal reproduction by extracting a plurality of TS packets for normal reproduction in which the video frames necessary for By setting the trick mode flags respectively and storing the information for designating the fast forward reproduction in the DSM trick mode field, the plurality of TS packets for normal reproduction outputted from the second address are set to the DSM trick mode. Converted into a plurality of special reproduction TS packets.

The second packet supply circuit 9 also recalculates the timing for transmitting the special reproduction TS packet set in the DSM trick mode according to the T_STD model, and based on the result, the normal reproduction TS packet.
Special playback TS packet converted from packet is DIF
Output to the processing circuit 10. The DIF processing circuit 10 uses the DI
A video / audio signal reproducing device 1 via a DIF cable 16 connected to a DIF terminal 15 provided in the F processing circuit 10.
Transport stream decoder 1 connected to 00
1 to the special reproduction TS packet.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. When the transport stream decoder 11 identifies that the received TS packet is the special reproduction TS packet,
The video frame being displayed is repeatedly displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. When the transport stream decoder 11 further receives the special reproduction TS packet in which the next video frame is packetized, the transport stream decoder 11 decodes the next video frame and updates the currently displayed video frame to the next video frame. In this way, the transport stream decoder 11 reproduces the video frames packetized in the special reproduction TS packets at a high speed of, for example, 3 times.

The video frame group 46 shown in FIG. 9 includes 3 video frames decoded by the transport stream decoder 11 based on the special reproduction TS packet converted from the normal reproduction TS packet by the second packet supply circuit 9.
It shows a mode in which they are arranged in the order of displaying at double speed.

In the example of the video frame group 46, the second packet supply circuit 9 outputs video frames (video frames I2, I17, ...
() Is extracted and is output to the transport stream decoder 11 via the DIF processing circuit 10 as a special reproduction TS packet. The transport stream decoder 11 receives each I picture (video frame I) packetized into TS packets for special reproduction.
, I17, I32, I49, ...) are repeatedly displayed, and the number of times of repeated display is adjusted (five times in the example of the video frame group 46 shown in FIG. 9) to display the normally reproduced video frame group 45. The video frame is reproduced at a high speed at a speed three times faster than that. Since there is no clear regulation regarding the function of the transport stream decoder 11 connected to the video / audio signal reproducing device for special reproduction of TS packets, it is easy to use only I pictures as in the example of the video frame group 46. It is common to perform special playback.

Since the TS packet read from the recording medium 7 is the normal reproduction TS packet, the discrimination circuit 2
A determination signal 12 indicating that the read TS packet is a normal reproduction TS packet is sent to the first packet supply circuit 1
Output to.

In the first packet supply circuit 1, since the discrimination signal 12 outputted from the discrimination circuit 2 indicates that the read TS packet is the normal reproduction TS packet, the packet request from the AV decoder 5 is issued. According to the signal 17, the TS packet for normal reproduction output from the first address designated by the first read pointer provided in the ring buffer 8 is supplied to the AV decoder 5.

The AV decoder 5 packetizes the video frames required for high speed reproduction from the plurality of normal reproduction TS packets supplied from the first packet supply circuit 1 in accordance with the instructed high speed reproduction speed. The extracted TS packets are extracted, and the extracted TS packets are sequentially decoded and displayed.

The video frame group 47 shown in FIG. 9 shows a mode in which the video frames decoded by the AV decoder 5 based on the normal reproduction TS packet are arranged in the order of displaying at triple speed. In the example of the video frame group 47 shown in FIG.
The decoder 5 receives all I from the TS packet for normal reproduction.
Picture and all P-pictures (video frame I
2, P5, P8, P11, P14, I17, ...), and by decoding all the extracted I pictures and all P pictures and displaying them in order,
FIG. 9 decoded by the transport stream decoder 11.
Similarly to the video frame group 46 shown in (1), the video frames are reproduced at high speed at a speed three times that of the normally reproduced video frame group 45.

As described above, since the AV decoder 5 has a high-speed reproduction function for extracting all I pictures and P pictures from the normal reproduction TS packet and displaying them in order, only the I picture is extracted from the normal reproduction TS packet. By adjusting the number of times the extracted I-pictures are repeatedly displayed, it is possible to obtain a high-speed playback image that is better than the transport stream decoder 11 that simply performs high-speed playback.

Next, the TS packet 3 recorded on the recording medium 7 is not the normal reproduction TS packet but the special reproduction TS.
The special reproduction T recorded on the recording medium 7 is a packet.
The operation of the video / audio signal reproducing apparatus 100 for high-speed reproduction of the video frame 6 packetized into S packets will be described.

The ring buffer 8 stores the special reproduction TS packet read from the recording medium 7 and the corresponding TS timing information. In response to the packet request signal 13 from the first packet supply circuit 1, the ring buffer 8 also outputs the special reproduction TS packet and the corresponding TS timing information stored at the first address designated by the first read pointer. 1 output to the packet supply circuit 1. In response to the packet request signal 14 from the second packet supply circuit 9, the ring buffer 8 further outputs the special reproduction TS packet and the corresponding TS timing information stored at the second address designated by the second read pointer. 2 Output to the packet supply circuit 9.

The discrimination circuit 2 discriminates whether the TS packet read from the recording medium 7 is a normal reproduction TS packet or a special reproduction TS packet. Since the TS packet read from the recording medium 7 is the special reproduction TS packet, the read TS packet is the special reproduction T packet.
The discriminating circuit 2 outputs the discriminating signal 12 indicating the S packet.
Is output to the first packet supply circuit 1.

The second packet supply circuit 9 outputs the special reproduction TS packet output from the second address to the DIF processing circuit 10 according to the TS timing information output from the second address designated by the second read pointer. To do. The DIF processing circuit 10 receives the special reproduction TS packet output from the second address from the second packet supply circuit 9, and transfers the special reproduction TS packet to the transport stream decoder 11 via the DIF cable 16 connected to the DIF terminal 15. Output a TS packet.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. The transport stream decoder 11 also repeatedly displays the video frame being displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. The transport stream decoder 11 further includes
When the reception of the special reproduction TS packet in which the next video frame is packetized is completed, the next video frame is decoded and the video frame being displayed is updated to the next video frame.

FIG. 2 is a diagram for explaining a video frame reproduced based on the special reproduction TS packet recorded on the recording medium 7. The video frame group 49 shows a mode in which the video frames decoded by the transport stream decoder 11 based on the special reproduction TS packets recorded on the recording medium 7 are arranged in the order of displaying at triple speed. The transport stream decoder 11 has a second
Since the packet supply circuit 9 converts the normal reproduction TS packet output from the second address into the special reproduction TS packet, as in the case described above, the TS packet is transmitted based on the TS timing information. The video frame group 49 showing a mode in which the video stream decoded by the port stream decoder 11 based on the special reproduction TS packet recorded on the recording medium 7 is displayed at triple speed is
The above-described video frame group 46 showing a mode in which the video frame decoded by the transport stream decoder 11 is displayed at 3 × speed based on the special reproduction TS packet converted from the normal reproduction TS packet by the second packet supply circuit 9. Similar results are obtained.

The first packet supply circuit 1 indicates that the discrimination signal 12 output from the discrimination circuit 2 indicates that the TS packet read from the recording medium 7 is a special reproduction TS packet. The special reproduction TS packet output from the first address is supplied to the AV decoder 5 according to the TS timing information output from the first address designated by the read pointer. AV decoder 5
Extracts the video frame packetized in the special reproduction TS packet output from the first address and decodes it.

The video frame group 50 shown in FIG. 2 is based on the special reproduction TS packet supplied from the first packet supply circuit 1 according to the TS timing information output from the first address designated by the first read pointer. , The mode in which the video frames decoded by the AV decoder 5 are arranged in the order of display. For the AV decoder 5, the special reproduction TS output from the first address according to the TS timing information output from the first address.
Since the packets are supplied, the decoding display result of the AV decoder 5 is the transport stream decoder 1 shown in the video frame group 49 as shown in the video frame group 50.
It is the same as the decoding display result of 1.

As described above, according to the first embodiment, the first
When the discriminating circuit 2 discriminates that the TS packet is a packet for normal reproduction, the packet supplying circuit 1
In response to the packet request signal 17 from the AV decoder 5,
When the TS packet output from the first address is supplied to the AV decoder 5 and the determination circuit 2 determines that the TS packet is a special reproduction packet, according to the TS timing information output from the first address, First
The AV packet is output from the TS packet output from the address.
Supply to.

Therefore, the trick play TS packet supplied to the AV decoder 5 is supplied in accordance with the TS timing information in the same manner as the TS packet supplied to the transport stream decoder 11. Therefore, the second address designated by the second pointer provided in the ring buffer 8 changes in correlation with the first address designated by the first pointer, and in response to a request from the AV decoder 5. As in the above-described conventional configuration for supplying the TS packet for special reproduction to the AV decoder 5, the second address and the first address are not separated as the reproduction is continued. As a result, the video frame packetized into the special reproduction TS packet recorded in the recording medium 7 can be reproduced in the AV decoder 5 and the transport stream decoder 11 without the ring buffer 8 being unlocked.

In the first embodiment, the discrimination circuit 2
Shows an example of determining whether the TS packet is a normal reproduction TS packet or a special reproduction TS packet based on the TS packet read from the recording medium 7, the present invention is not limited to this. Not limited. The determination circuit 2 may determine whether the TS packet is a normal reproduction TS packet or a special reproduction TS packet based on the TS packet output from the ring buffer 8.

(Second Embodiment) FIG. 3 is a block diagram of a video / audio signal reproducing apparatus 200 according to the second embodiment.
The same components as those of the audiovisual signal reproducing apparatus 100 according to the first embodiment described above with reference to FIG. 1 are designated by the same reference numerals. Therefore, detailed description of these components will be omitted. The difference from the configuration of the video / audio signal reproducing apparatus 100 according to the first embodiment described above is that a synchronization control circuit 21 is further provided, and that instead of the first packet supply circuit 1, a first packet supply circuit 1A is provided. That is the point. The synchronization control circuit 21 includes a first video frame boundary detection circuit 23 and a second video frame boundary detection circuit 2.
5 and TS packet supply instruction circuit 27.

The normal reproduction TS packet is recorded on the recording medium 7, and the normal reproduction TS recorded on the recording medium 7 is recorded.
A video / audio signal reproducing device 2 according to a second embodiment for high-speed reproduction of a video frame 6 packetized into packets.
The operation of 00 is the same as the operation of the audiovisual signal reproducing apparatus 100 according to the first embodiment described above, and thus the description thereof will be omitted. Hereinafter, the TS packet 3 recorded in the recording medium 7 is not the normal reproduction TS packet but the special reproduction TS packet, and the video frame 6 packetized in the special reproduction TS packet recorded in the recording medium 7 is transmitted at high speed. The operation of the video / audio signal reproducing device 200 for reproducing will be described.

The ring buffer 8 stores the special reproduction TS packet read from the recording medium 7 and the corresponding TS timing information. The ring buffer 8 also transfers the special reproduction TS packet stored at the first address designated by the first read pointer to the first packet supply circuit 1A in response to the packet request signal 13 from the first packet supply circuit 1A. First video frame boundary detection circuit 23
And output to.

The ring buffer 8 further receives the second packet in response to the packet request signal 14 from the second packet supply circuit 9.
The special reproduction TS packet stored at the second address designated by the read pointer and the corresponding TS timing information are output to the second packet supply circuit 9 and the second video frame boundary detection circuit 25.

The second packet supply circuit 9 outputs the special reproduction TS packet output from the second address to the DIF processing circuit 10 according to the TS timing information output from the second address designated by the second read pointer. To do. The DIF processing circuit 10 receives the special reproduction TS packet output from the second address from the second packet supply circuit 9, and transfers the special reproduction TS packet to the transport stream decoder 11 via the DIF cable 16 connected to the DIF terminal 15. Output a TS packet.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. The transport stream decoder 11 also repeatedly displays the video frame being displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. The transport stream decoder 11 further includes
When the reception of the special reproduction TS packet in which the next video frame is packetized is completed, the next video frame is decoded and the video frame being displayed is updated to the next video frame.

FIG. 4 is a diagram for explaining a video frame reproduced based on the special reproduction TS packet by the video / audio signal reproducing device 200 according to the second embodiment. The video frame group 51 shows a mode in which the video frames decoded by the transport stream decoder 11 based on the special reproduction TS packets recorded on the recording medium 7 are arranged in the order of displaying at triple speed. Since the trick play TS packet is transmitted to the transport stream decoder 11 based on the TS timing information, the transport stream decoder 11 decodes the trick play TS packet based on the trick play TS packet recorded on the recording medium 7. Similar to the video frame group 49 described in the first embodiment, the video frame group 51 showing a mode in which the video frames are displayed at triple speed is for special reproduction which is converted from the TS packets for normal reproduction by the second packet supply circuit 9. Transport stream decoder 1 based on TS packets
1 has the same result as the above-mentioned video frame group 46 showing the mode in which the decoded video frame is displayed at the triple speed.

At the time T1, the second video frame boundary detection circuit 25 detects the special reproduction TS packet output from the second address designated by the second read pointer and outputs the picture header provided at the beginning of the video frame I17. By detecting the boundary between the video frame I2 and the video frame I17, the pulse-shaped second video frame boundary detection signal 26 is output to the TS packet supply instruction circuit 27.

At time T2 after time T1, the first video frame boundary detection circuit 23 starts the video frame I17 from the special reproduction TS packet stored at the first address designated by the first read pointer. When the boundary between the video frame I2 and the video frame I17 is detected by detecting the picture header provided in the first picture frame boundary detection signal 24
To the TS packet supply instruction circuit 27.

The TS packet supply instructing circuit 27 outputs the time T
When the pulse-shaped second video frame boundary detection signal 26 is output from the second video frame boundary detection circuit 25 in 1, the TS indicating the permission to supply the TS packet output from the first address to the AV decoder 5 is output. The synchronization control signal 22 is changed to the high state, which is the packet supply permission state, and is output to the first packet supply circuit 1A.

The TS packet supply instruction circuit 27 also outputs the TS packet output from the first address when the pulse-shaped first video frame boundary detection signal 24 is output from the first video frame boundary detection circuit 23 at time T2. To A
The sync control signal 22 is changed to a low state, which is a TS packet supply prohibition state indicating prohibition of supply to the V decoder 5, and is output to the first packet supply circuit 1A.

The discrimination circuit 2 discriminates whether the TS packet read from the recording medium 7 is a normal reproduction TS packet or a special reproduction TS packet. Since the TS packet read from the recording medium 7 is the special reproduction TS packet, the read TS packet is the special reproduction T packet.
The discriminating circuit 2 outputs the discriminating signal 12 indicating the S packet.
Output to the first packet supply circuit 1A.

The first packet supply circuit 1A includes the discrimination circuit 2
Since the determination signal 12 output from the TS packet indicates that the read TS packet is a special reproduction TS packet, the synchronization control signal 22 output from the TS packet supply instruction circuit 27 indicates the TS packet supply enable state. The period from time T1 to time T2 in the high state is
In response to the packet request signal 17 from the AV decoder 5,
The TS packet output from the first address is supplied to the AV decoder 5, and the synchronization control signal 22 is output from the first address during a period after time T2 in which the TS packet supply is in a low state in which the TS packet supply is prohibited. AV of TS packet
The supply to the decoder 5 is stopped.

At time T3, the second video frame boundary detection circuit 25 detects the boundary between the video frame I17 and the video frame I32 by detecting the picture header provided at the beginning of the video frame I32. Again, the pulse-shaped second video frame boundary detection signal 26
To the TS packet supply instruction circuit 27. When the first video frame boundary detection circuit 23 detects the boundary between the video frame I17 and the video frame I32 by detecting the picture header provided at the beginning of the video frame I32 at time T4, the first video frame boundary detection circuit 23 again detects the pulse shape. And outputs the first video frame boundary detection signal 24 to the TS packet supply instruction circuit 27. TS packet supply instruction circuit 27
When the pulse-shaped second video frame boundary detection signal 26 is output at time T3, changes the synchronization control signal 22 to the high state, which is the TS packet supply permission state, again,
Output to the first packet supply circuit 1A. The TS packet supply instruction circuit 27 also outputs TS when the pulse-shaped first video frame boundary detection signal 24 is output at time T4.
Synchronous control signal 2 goes low when packet supply is disabled
2 is changed and output to the first packet supply circuit 1A.

The first packet supply circuit 1 operates at time T3 when the synchronization control signal 22 is in the TS packet supply enable state.
From the time T4 to the time T4, the TS packet is supplied to the AV decoder 5 in response to the packet request signal 17 from the AV decoder 5, and the synchronization control signal 22 is in the TS packet supply prohibited state. Stops the supply of TS packets to the AV decoder 5.

The video frame group 52 shown in FIG. 4 is based on the special reproduction TS packet recorded on the recording medium 7.
A mode in which the video frames decoded by the AV decoder 5 are arranged in the order in which they are displayed at triple speed is shown. Synchronous control circuit 2
By repeating the above-described processing by the first and first packet supply circuits 1A, the display result of the transport decoder 11 and the display result of the AV decoder 5 are as shown in FIG.
Video frame group 51 and video frame group 52 in
The synchronization is maintained as shown in.

As described above, according to the second embodiment, the first
Based on the TS packet output from the address and the TS packet output from the second address, the TS packet supplied from the first packet supply circuit 1A to the AV decoder 5 is transferred from the second packet supply circuit 9 to the transport stream decoder. A synchronization control circuit 2 for generating a synchronization control signal 22 for synchronizing with the TS packet supplied to 11.
1 is provided, the first packet supply circuit 1A responds to the packet request signal 17 from the AV decoder 5 in response to the packet request signal 17 from the AV decoder 5 when the determination circuit 2 determines that the TS packet is a normal reproduction packet. When the TS packet output from the address is supplied to the AV decoder 5 and the determination circuit 2 determines that the TS packet is the special reproduction packet, the synchronization control signal 22 generated by the synchronization control circuit 21 is used. , And supplies the TS packet output from the first address to the AV decoder 5.

Therefore, the second address designated by the second pointer provided in the ring buffer 8 is the first address.
It changes in correlation with the first address designated by the pointer. Therefore, as the reproduction of the second address and the first address is continued as in the above-described conventional configuration in which the TS packet for special reproduction is always supplied to the AV decoder 5 in response to the request from the AV decoder 5, the farther apart There is no going. As a result, the video frame packetized into the special reproduction TS packet can be reproduced in the AV decoder 5 and the transport stream decoder 11 without the ring buffer 8 being unlocked without using the TS timing information.

In the second embodiment, the first embodiment is used.
Similarly to the above, the discriminating circuit 2 determines that the TS packet is a T packet for normal reproduction based on the TS packet read from the recording medium 7.
An example of determining whether the packet is an S packet or a trick play packet is shown, but the present invention is not limited to this.
The determination circuit 2 may determine whether the TS packet is a normal reproduction TS packet or a special reproduction packet based on the TS packet output from the ring buffer 8.

Also, the first video frame boundary detection circuit 23
Detects a boundary between a plurality of video frames based on the TS packet output from the ring buffer 8.
The boundaries between a plurality of video frames may be detected based on the TS packets output from the first packet supply circuit 1A. Similarly, the second video frame boundary detection circuit 25
Although the boundaries between the plurality of video frames are detected based on the TS packets output from the ring buffer 8, the boundaries between the plurality of video frames are detected based on the TS packets output from the second packet supply circuit 9. May be detected.

Further, the first video frame boundary detection circuit 2
The third and second video frame boundary detection circuits 25 detect boundaries between a plurality of video frames based on the picture header, but the plurality of video frames are detected based on other 32-bit unique codes such as a sequence header and a GOP header. Boundaries between the video frames may be detected.

An example is shown in which the TS packet supply instruction circuit 27 outputs the synchronization control signal 22 to the first packet supply circuit 1A and the discrimination circuit 2 outputs the discrimination signal 12 to the first packet supply circuit 1A. Packet supply instruction circuit 27
And the discrimination circuit 2 sends the sync control signal 2 to the AV decoder 5.
2 and the discrimination signal 12 may be output respectively.

(Third Embodiment) FIG. 5 is a block diagram of a video / audio signal reproducing apparatus 300 according to the third embodiment.
The same components as those of the audiovisual signal reproducing apparatus 100 according to the first embodiment described above with reference to FIG. 1 are designated by the same reference numerals. Therefore, detailed description of these components will be omitted. The difference from the configuration of the video / audio signal reproducing apparatus 100 according to the first embodiment described above is that a synchronization control circuit 21A is further provided, and that instead of the first packet supply circuit 1, a first packet supply circuit 1B is provided. Point and an AV decoder 5A instead of the AV decoder 5
It is a point equipped with. The synchronization control circuit 21A has a video frame boundary detection circuit 31 and a display count determination circuit 33.

A video / audio signal reproducing apparatus 30 according to the third embodiment for high speed reproduction of the video frame 6 packetized in the TS packet for normal reproduction recorded on the recording medium 7.
The operation of 0 is the same as the operation of the audiovisual signal reproducing apparatus 100 according to the first embodiment described above, and thus the description thereof will be omitted. Hereinafter, the TS packet 3 recorded in the recording medium 7 is not the normal reproduction TS packet but the special reproduction TS packet, and the video frame 6 packetized in the special reproduction TS packet recorded in the recording medium 7 is transmitted at high speed. The operation of the video / audio signal reproducing device 300 for reproducing will be described.

The ring buffer 8 stores trick play TS packets read from the recording medium 7 and corresponding TS timing information. The ring buffer 8 also sends the special reproduction TS packet stored at the first address designated by the first read pointer to the first packet supply circuit 1B in response to the packet request signal 13 from the first packet supply circuit 1B. Output.

The ring buffer 8 further receives the second packet in response to the packet request signal 14 from the second packet supply circuit 9.
The special reproduction TS packet stored at the second address designated by the read pointer and the corresponding TS timing information are output to the second packet supply circuit 9 and the video frame boundary detection circuit 31.

The second packet supply circuit 9 outputs the special reproduction TS packet output from the second address to the DIF processing circuit 10 in accordance with the TS timing information output from the second address designated by the second read pointer. To do. The DIF processing circuit 10 receives the special reproduction TS packet output from the second address from the second packet supply circuit 9, and transfers the special reproduction TS packet to the transport stream decoder 11 via the DIF cable 16 connected to the DIF terminal 15. Output a TS packet.

Transport stream decoder 11
Is D of the PES header 45 packetized in the payload section 56 provided in the received special reproduction TS packet.
Based on the SM trick mode flag and the DSM trick mode field, it is identified that the received TS packet is a trick play TS packet. The transport stream decoder 11 also repeatedly displays the video frame being displayed until the reception of the special reproduction TS packet in which the next video frame is packetized is completed. The transport stream decoder 11 further includes
When the reception of the special reproduction TS packet in which the next video frame is packetized is completed, the next video frame is decoded and the video frame being displayed is updated to the next video frame.

FIG. 6 is a diagram for explaining a video frame reproduced based on the special reproduction TS packet by the video / audio signal reproducing device 300 according to the third embodiment. The video frame group 53 shows a mode in which the video frames decoded by the transport stream decoder 11 based on the special reproduction TS packets recorded on the recording medium 7 are arranged in the order of displaying at triple speed. Since the special reproduction TS packet is transmitted to the transport stream decoder 11 based on the TS timing information, based on the special reproduction TS packet converted from the normal reproduction TS packet by the second packet supply circuit 9. The same result as that of the video frame group 46 in FIG. 9 described above showing the mode in which the video frames decoded by the transport stream decoder 11 are displayed at the triple speed.

Each time the video frame boundary detection circuit 31 detects a picture header provided at the beginning of each video frame from the special reproduction TS packet output from the second address designated by the second read pointer, The pulse-shaped video frame boundary detection signal 32 is output to the display count determination circuit 33. The display count determination circuit 33 displays the video frame represented by the time interval between the video frame boundary detection signal 32 and the next video frame boundary detection signal 32 and a predetermined video frame display cycle signal 34. By comparing and, the signal indicating the number of times the video frame is repeatedly displayed is output to the AV decoder 5A as the synchronization control signal 22A. In the example shown in FIG. 6, the video frame boundary detection signal 32 output at time T5 when the picture header provided at the beginning of the video frame I2 is detected and the picture header provided at the beginning of the next video frame I17 are detected. By comparing the time interval between the video frame boundary detection signal 32 output at the time T6 and the display cycle of the video frame represented by the video frame display cycle signal 34, the number of times of repeated display of the video frame is 5 Is output to the AV decoder 5A as the synchronization control signal 22A.

The discrimination circuit 2 discriminates whether the TS packet read from the recording medium 7 is a normal reproduction TS packet or a special reproduction TS packet. Since the TS packet read from the recording medium 7 is the special reproduction TS packet, the read TS packet is the special reproduction T packet.
The discriminating circuit 2 outputs the discriminating signal 12 indicating the S packet.
Output to the AV decoder 5A.

Since the discrimination signal 12 outputted from the discrimination circuit 2 indicates that the read TS packet is the special reproduction TS packet, the AV decoder 5A displays the video represented by the sync control signal 22A. The video frame is repeatedly displayed for the number of times of repeated display of the frame, and the TS packet request to the first packet supply circuit 1B is stopped during that time. For example, as shown in the video frame group 54 of FIG. 6, the AV decoder 5A repeatedly displays the video frame I2 for the number of times of repeated display of the video frame represented by the synchronization control signal 22A. After that, the packet request signal 17 is output to the first packet supply circuit 1B, the TS packet is received from the first packet supply circuit 1B,
The next video frame I17 packetized in the received TS packet is decoded and displayed.

The display result of the transport decoder 11 and the display result of the AV decoder 5A become
The synchronization is maintained as shown in the video frame group 53 and the video frame group 54 in FIG.

As described above, according to the third embodiment, the video frame boundary detection circuit 31 detects a video frame boundary every time a boundary between a plurality of video frames is detected from the TS packet output from the second address. The signal 32 is output. The display number determination circuit 33 is a signal indicating the number of times the video frame is repeatedly displayed, based on the time interval between the video frame boundary detection signals 32 output from the video frame boundary detection circuit 31 and the display cycle for displaying the video frame. Is output to the AV decoder 5A as the synchronization control signal 22A. The AV decoder 5A requests the first packet supply circuit 1B for the TS packet output from the first address during a period corresponding to the number of times of repeated display represented by the synchronization control signal 22A output from the display number determination circuit 33. Stop doing

Therefore, the second address designated by the second pointer provided in the ring buffer 8 is the first address.
It changes in correlation with the first address designated by the pointer. Therefore, from the AV decoder, always TS
A packet is requested, and a TS packet for special reproduction is supplied to the AV decoder in response to a request from the AV decoder. Like the above-described conventional configuration, the second address and the first address are separated as the reproduction is continued. There is no going.
As a result, regardless of whether the TS packet recorded in the recording medium 7 is the normal reproduction TS packet or the special reproduction TS packet, the TS packet is the first packet in accordance with only the packet request signal 17 from the AV decoder 5A. Even when the supply circuit 1B supplies the AV decoder 5A, the video frame packetized into TS packets can be reproduced by the AV decoder 5A and the transport stream decoder 11 without the ring buffer 8 unlocking.

The third embodiment is different from the first embodiment.
Similarly to the above, the discriminating circuit 2 determines that the TS packet is a T packet for normal reproduction based on the TS packet read from the recording medium 7.
An example of determining whether the packet is an S packet or a trick play packet is shown, but the present invention is not limited to this.
The determination circuit 2 may determine whether the TS packet is a normal reproduction TS packet or a special reproduction packet based on the TS packet output from the ring buffer 8.

The video frame boundary detection circuit 31 detects boundaries between a plurality of video frames based on the TS packets output from the ring buffer 8.
A boundary between a plurality of video frames may be detected based on the TS packet output from the packet supply circuit 9.

Further, the video frame boundary detection circuit 31
Detects a boundary between a plurality of video frames based on a picture header, but detects a boundary between the plurality of video frames by detecting another 32-bit unique code such as a sequence header or a GOP header. It may be detected.

The display circuit discrimination circuit 33 is the AV decoder 5A.
An example is shown in which the sync control signal 22A is output to the AV decoder 5A and the decision circuit 2 outputs the decision signal 12 to the AV decoder 5A.
The display circuit discrimination circuit 33 and the discrimination circuit 2 send the synchronization control signal 22A and the discrimination signal 1 to the first packet supply circuit 1B.
2 may be output respectively.

[0113]

As described above, according to the present invention, the video frame packetized into the special reproduction TS packet recorded on the recording medium is reproduced in the AV decoder and the transport stream decoder without breaking the ring buffer. It is possible to provide a video / audio signal reproducing device capable of performing the same.

Further, according to the present invention, a video / audio signal capable of synchronizing the reproduction in the AV decoder and the reproduction in the transport stream decoder of the video frame packetized in the special reproduction TS packet recorded on the recording medium. A playback device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a video / audio signal reproducing device according to a first embodiment.

FIG. 2 is a special reproduction T in which a DSM trick mode is set by the video / audio signal reproduction device according to the first embodiment.
FIG. 6 is a diagram for explaining a video frame reproduced based on an S packet.

FIG. 3 is a block diagram of a video / audio signal reproducing device according to a second embodiment.

FIG. 4 is a special reproduction T in which a DSM trick mode is set by the video / audio signal reproduction device according to the second embodiment.
FIG. 6 is a diagram for explaining a video frame reproduced based on an S packet.

FIG. 5 is a block diagram of a video / audio signal reproducing device according to a third embodiment.

FIG. 6 is a special reproduction T in which a DSM trick mode is set by the video / audio signal reproducing device according to the third embodiment.
FIG. 6 is a diagram for explaining a video frame reproduced based on an S packet.

FIG. 7 is a block diagram of a conventional video / audio signal reproducing device.

FIG. 8 is a diagram for explaining the relationship between a video elementary stream composed of encoded video frames and TS packets.

FIG. 9 is a diagram for explaining a video frame reproduced based on a TS packet for normal reproduction by a conventional audio / video signal reproducing device.

FIG. 10 is a schematic diagram showing a conventional video / audio signal reproducing device for DS
FIG. 3 is a diagram for explaining a video frame reproduced based on a special reproduction TS packet in which the M trick mode is set.

[Explanation of symbols]

1 First packet supply circuit 2 discrimination circuit 3 TS packets 4 TS timing information 5 AV decoder 6 Packet request signal 7 recording media 8 ring buffer 9 Second packet supply circuit 10 DIF processing circuit 11 Transport stream decoder 12 Discrimination signal 13 Packet request signal 14 Packet request signal 21 Synchronous control circuit 22 Synchronous control signal 23 First video frame boundary detection circuit 24 First video frame boundary detection signal 25 Second video frame boundary detection circuit 26 Second video frame boundary detection signal 27 TS packet supply instruction circuit 31 Video frame boundary detection circuit 32 video frame boundary detection signal 33 Display count circuit 34 Video frame display synchronization signal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuya Mizushima             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C053 FA20 GB06 GB38 HA21 JA03                       JA22                 5D044 AB05 AB07 DE02 DE03 DE12                       FG10 FG23 GK08

Claims (9)

[Claims] 1. An MP for encoding a plurality of encoded video frames.
A plurality of transport stream packets (hereinafter referred to as “TS packets”) packetized according to the EG transport stream method and each TS packet are T-ST
D (transport stream system)
Corresponding to each TS packet and each TS packet read from a recording medium on which transport stream timing information (hereinafter referred to as “TS timing information”) associated with each timing for transmission according to a target decoder model is recorded. Do T
A ring buffer in which S timing information is stored respectively; a discriminating means for discriminating whether the TS packet read from the recording medium is a normal reproduction packet or a special reproduction packet; An AV decoder provided to decode the video frame packetized into a TS packet output from the first address designated by the first pointer provided in the buffer; and a TS output from the first address. Packet and T
First packet supply means for receiving the S timing information and supplying the TS packet outputted from the first address to the AV recorder, and outputted from the second address designated by the second pointer provided in the ring buffer. Received TS packet and TS timing information, and according to the TS timing information output from the second address, the second
Through a digital interface (DIF) processing means, a TS packet output from the address to a transport stream decoder provided to decode the video frame packetized into the TS packet output from the second address. And a second packet supply means for supplying, wherein the first packet supply means outputs from the AV decoder if the TS packet is determined to be the normal reproduction packet by the determination means. In response to the packet request signal, the TS packet output from the first address is supplied to the AV decoder, and when the determining unit determines that the TS packet is the special reproduction packet, According to the TS timing information output from one address, the first address A video / audio signal reproducing apparatus characterized in that the TS packet output from the AV decoder is supplied to the AV decoder. 2. MP encoding a plurality of encoded video frames
A plurality of TS packets packetized according to the EG transport stream method and each TS packet are T-STD
A ring buffer in which each TS packet read from a recording medium in which TS timing information related to the timing for transmitting according to the model is recorded and TS timing information corresponding to each TS packet are respectively stored. Instructed by a discriminating means for discriminating whether the TS packet read from the recording medium is a normal reproduction packet or a special reproduction packet, and a first pointer provided in the ring buffer. An AV decoder provided to decode the video frame packetized into a TS packet output from the first address, and a TS packet output from the first address, and output from the first address First packet supply for supplying TS packets to the AV decoder According stage and receiving said ring TS packet and TS timing information output from the second address indicated by the second pointer provided in the buffer, TS timing information output from the second address, the second
A second TS packet supplied from the address is supplied to a transport stream decoder provided for decoding the video frame packetized into the TS packet output from the second address, through a DIF processing means. The packet supply means, and based on at least one of the TS packet output from the first address and the TS packet output from the second address, the first packet supply means outputs the A packet.
And a synchronization control circuit for generating a synchronization control signal for synchronizing the TS packet supplied to the V decoder with the TS packet supplied from the second packet supply means to the transport stream decoder. The 1-packet supply means, when the TS packet is determined to be the normal reproduction packet by the determination means, outputs the TS output from the first address in response to the packet request signal from the AV decoder. When a packet is supplied to the AV decoder and the TS packet is determined to be the packet for special reproduction by the determination means, the first packet is transmitted based on the synchronization control signal generated by the synchronization control circuit. A TS packet output from one address is supplied to the AV decoder. Video and audio signal playback device. 3. The synchronization control circuit, when detecting a boundary between the plurality of video frames from the TS packet output from the first address, a first video for notifying that the boundary has been detected. First video frame boundary detection means for generating a frame boundary detection signal, and when detecting a boundary between the plurality of video frames from the TS packet output from the second address, the fact that the boundary has been detected is notified. Second video frame boundary detection means for generating a second video frame boundary detection signal, and from the first packet supply means based on the first video frame boundary detection signal and the second video frame boundary detection signal. The first packet supply unit uses the signal for permitting or prohibiting the supply of the TS packet to the AV decoder as the synchronization control signal. And a TS packet supply instruction means for outputting, video and audio signal reproducing apparatus according to claim 2, wherein. 4. The TS packet supply instruction means, when receiving the second video frame boundary detection signal, a TS indicating permission to supply the TS packet output from the first address to the AV decoder. When the synchronization control signal is changed to the packet supply permission state and the first video frame boundary detection signal is received, a TS indicating prohibition of supplying the TS packet output from the first address to the AV decoder The synchronization control signal is changed to a packet supply prohibited state, and the first packet supply means is configured to change the synchronization control signal to the first state during a period in which the synchronization control signal is in the TS packet supply permitted state.
The video / audio signal reproducing device according to claim 3, wherein the TS packet output from the address is supplied to the AV decoder. 5. The video frame boundary detection means for outputting a video frame boundary detection signal each time the synchronization control circuit detects a boundary between the plurality of video frames from the TS packet output from the second address. A signal indicating the number of times the video frame is repeatedly displayed based on a time interval between the video frame boundary detection signals output from the video frame boundary detection means and a predetermined display cycle for displaying the video frame. Is displayed as the synchronization control signal to the first packet supply unit, and the first packet supply unit is represented by the synchronization control signal output from the display count determination unit. The TS packet output from the first address to the AV decoder during a period corresponding to the number of times of repeated display. The video / audio signal reproducing device according to claim 2, wherein the supply is stopped. 6. MP encoding a plurality of encoded video frames
A plurality of TS packets packetized according to the EG transport stream method and each TS packet are T-STD
A ring buffer in which each TS packet read from a recording medium in which TS timing information related to the timing for transmitting according to the model is recorded and TS timing information corresponding to each TS packet are respectively stored. Instructed by a discriminating means for discriminating whether the TS packet read from the recording medium is a normal reproduction packet or a special reproduction packet, and a first pointer provided in the ring buffer. An AV decoder provided for decoding the video frame packetized into the TS packet output from the first address, and a packet request signal from the AV decoder that receives the TS packet output from the first address The TS packet output from the first address according to The A
The first packet supply means for supplying to the V decoder and the TS packet and the TS timing information outputted from the second address designated by the second pointer provided in the ring buffer are received and outputted from the second address. According to the TS timing information, the second
A second TS packet supplied from the address is supplied to a transport stream decoder provided for decoding the video frame packetized into the TS packet output from the second address, through a DIF processing means. The packet supply means, and based on at least one of the TS packet output from the first address and the TS packet output from the second address, the first packet supply means outputs the A packet.
And a synchronization control circuit for generating a synchronization control signal for synchronizing the TS packet supplied to the V decoder with the TS packet supplied from the second packet supply means to the transport stream decoder. When the determination unit determines that the TS packet is the special reproduction packet, the decoder outputs the first address based on the synchronization control signal generated by the synchronization control circuit. A video / audio signal reproducing apparatus which outputs the packet request signal for requesting a TS packet to the first packet supply means. 7. The first video for notifying that the boundary has been detected, when the synchronization control circuit detects a boundary between the plurality of video frames from the TS packet output from the first address. First video frame boundary detection means for generating a frame boundary detection signal, and when the boundary between the plurality of video frames is detected from the TS packet output from the second address, the fact that the boundary has been detected is notified. Output from the first address based on the first video frame boundary detection signal and the second video frame boundary detection signal; A signal for permitting or prohibiting the request of the TS packet from the first packet supplying means is used as the synchronization control signal. And a TS packet supply instruction means for outputting to Da, video and audio signal reproducing apparatus according to claim 6. 8. The TS packet supply instructing means, when receiving the second video frame boundary detection signal, outputs the TS packet output from the first address to the AV decoder to the first packet supplying means. When the synchronization control signal is changed to the TS packet request permission state indicating permission of the request and the first video frame boundary detection signal is received, the T output from the first address is received.
The S packet is sent to the first packet supply means as the A packet.
The V decoder changes the synchronization control signal to a TS packet request prohibition state indicating prohibition of the request, and the AV decoder is configured to change the synchronization control signal to the TS packet request permission state during the first period. 8. The video / audio signal reproducing device according to claim 7, which outputs the packet request signal for requesting the TS packet output from the address to the first packet supply means. 9. The video frame boundary detection means for outputting a video frame boundary detection signal each time the synchronization control circuit detects a boundary between the plurality of video frames from the TS packet output from the second address. A signal indicating the number of times the video frame is repeatedly displayed based on a time interval between the video frame boundary detection signals output from the video frame boundary detection means and a predetermined display cycle for displaying the video frame. A display number discriminating means for outputting the synchronization control signal to the AV decoder, wherein the AV decoder corresponds to the repeated display number represented by the synchronization control signal outputted from the display number discriminating means. Requesting the TS packet output from the first address to the first packet supply means during the period Stop Rukoto, video and audio signal reproducing apparatus according to claim 6.