JP2003174620A - Digital video signal recording and reproducing device, recording device, reproducing device, digital video signal recording and reproducing method, recording method, and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method that can record video data in a way capable of accurate reproduction speed control and can apply accurate reproduction speed control to the video data. <P>SOLUTION: The recording device includes: a reception time display timer 10; a time stamp attachment section 11 that attaches reception time information to a TS packet; a picture type analysis/flag attachment section 12; and a data recording section 13 that records the TS packet, to which the reception time information and picture type information are attached, to a recording medium 14. The reproducing device includes: a data read section 15 that reads data from the recording medium 14; a picture extract section 16 that selects a TS packet to be reproduced on the basis of the picture type information; a time stamp extract section 17 that analyzes the reception time information; a buffer 19; and a reproduction speed control section 18 that allows the buffer 16 to output the TS packet at a time in response to the reception time information to control a reproduction time. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for recording or reproducing digitally encoded video data on a recording medium.

[0002]

2. Description of the Related Art In digital broadcasting, MPEG2 (Moving Picture E), which is a high-efficiency coding method as an image compression method, is used.
xperts Group Phase2) is used. In addition, a transport stream method used for real-time transmission such as broadcasting is used as a multiplex method for transmitting the image-compressed digital signal. The digital broadcast receiver extracts the compressed image data from the received transport stream (TS), and then the video decoder performs a decoding process. The video signal obtained by this decoding process is displayed as a moving image on the display.

Fast-forward reproduction, which is one of special reproductions in a digital broadcast recording / reproducing apparatus, is realized by reproducing only I pictures or only I and P pictures from a recording medium. The playback speed during fast-forward playback is controlled by outputting every m (m is a positive integer) pictures to be output.

[0004]

However, when outputting every m pictures to be output, the reproduction speed depends on the structure of the digital video stream. For this reason, in fast-forward reproduction in which only I pictures are output, if the number of pictures between I pictures in the digital video stream is not constant, the reproduction speed will not be constant. In particular, in fast-forward viewing at a relatively low speed with audio for which I and P pictures are output, uneven playback speed is noticeable, and the viewer tends to feel a sense of discomfort.

Therefore, the present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a digital video signal recording apparatus and a digital video signal recording apparatus which enable accurate reproduction speed control. Recording method, digital video signal reproducing apparatus and reproducing method capable of accurate reproduction speed control,
Another object of the present invention is to provide a digital video signal recording / reproducing apparatus and a recording / reproducing method capable of performing accurate reproduction speed control.

[0006]

According to a first aspect of the present invention, there is provided a digital video signal recording / reproducing apparatus comprising: a reception time measuring means for measuring the arrival time of a received transport packet; and an arrival time measured by the reception time measuring means. The time information adding means for adding arrival time information indicating the time to the transport packet, the picture type analyzing means for analyzing the picture type from the transport packet, and the picture type analyzed by the picture type analyzing means are shown. Type information adding means for adding picture type information to the transport packet, recording means for recording the transport packet with arrival time information and picture type information added to a recording medium, arrival time information and picture from the recording medium Read transport packet with type information added Reading means, selecting means for selecting and outputting only the transport packet to be reproduced based on the picture type information added to the transport packet read by the reading means, and the transport selected by the selecting means. Time information analyzing means for analyzing and outputting arrival time information added to the port packet, buffer means for temporarily holding the transport packet output from the selecting means, and output from the time information analyzing means And a reproduction speed control means for controlling the reproduction time of the transport packet by outputting the transport packet to which the arrival time information is added from the buffer means at a time corresponding to the arrived arrival time information. It has a feature.

In the digital video signal recording / reproducing apparatus according to a second aspect of the present invention, the reproducing speed control means includes a present time measuring means for measuring a present time at which measurement is started from an initialized time, and the selecting means. The picture of the f-th frame (f is an integer of 0 or more) output from the
Number p (where p is an integer between 0 and M inclusive) that forms a part of the picture of the f-th frame when transmitted as transport packets up to the number (M is a positive integer) The time is expressed as T (If_Ap), and at the same time as the start of reproduction, the present time measuring means receives the measured value of the first transport packet forming a part of the picture of the first frame to be received first. After the initialization at time T (I0_A0), the measurement of the current time is started, and at the time of normal reproduction, the reproduction speed control means <2-1> the current time measured by the current time measurement means is the transport time. It is determined whether the time T (If_Ap) based on the arrival time information added to the packet is matched, and <2-2> the current time measured by the current time measuring means is When it coincides with the time T (If_Ap) based on the arrival time information added to the transport packet, the p-th transport packet forming a part of the picture of the f-th frame is output from the buffer means <2. -3> The processing <2-1> and <2
-2> is sequentially executed from the first transport packet forming a part of the picture of the first frame.

In the digital video signal recording / reproducing apparatus according to a third aspect of the present invention, the reproducing speed control means includes a present time measuring means for measuring a present time at which measurement is started from an initialized time, and the selecting means. The picture of the f-th frame (f is an integer of 0 or more) output from the
Number p (where p is an integer between 0 and M inclusive) that forms a part of the picture of the f-th frame when transmitted as transport packets up to the number (M is a positive integer) The time is expressed as T (If_Ap), and at the same time as the start of reproduction, the present time measuring means receives the measured value of the first transport packet forming a part of the picture of the first frame to be received first. After initialization at time T (I0_A0), measurement of the current time is started, and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means <3-1> of the transport packet to be reproduced. the time _{t d1} obtained by subtracting the arrival time T of the No.1 transport packets constituting a part of a picture of the first numbered frame from the arrival time T (If_Ap) (I0_A0), following t _d1 = determined by T (If_Ap) -T (I0_A0) , <3-2> time _{t d1} to the value _{t d1} / N that one factor of N, the constituting part of a picture of the first numbered frame Arrival time T (I
The time _{T a} which adds 0_A0), calculated from: _{T a = (t d1 / N} ) + T (I0_A0), current time measuring said current time measuring means <3-3> time _{T a} match To determine whether
<3-4> When time T _a to the current time measuring means matches the current time to be measured, to output a first p-th transport packet constituting a part of the picture of the f-th frame from the buffer means , <3-5> Processing <
It is characterized in that steps 3-1> to <3-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame.

Further, in the digital video signal recording / reproducing apparatus according to a fourth aspect, the reproducing speed control means includes a present time measuring means for measuring a present time at which the measurement is started from an initialized time, and the selecting means. The picture of the f-th frame (f is an integer of 0 or more) output from the
Number p (where M is a positive integer), the arrival of the p-th (p is an integer from 0 to M) transport packet that forms part of the picture of the f-th frame The time is expressed as T (If_Ap), and the current time measuring means receives the measured value at the same time when the first transport packet forming a part of the picture of the first frame that is received first arrives. After initialization at time T (I0_A0), measurement of the current time is started, and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means stores the <4A> picture head data at the f-th position. First part of a picture of a frame
<4A- when outputting the No. transport packet
1> Arrival time T of the transport packet to be reproduced
Time t obtained by subtracting the arrival time T (I0_A0) of the first transport packet from (If_A0)
The _d2, obtained by the following equation _{t d2 = T (If_A0) -T} (I0_A0), <4A-2> time _{t d2} with one to the value _{t d2} / N divided by N, the picture of the first numbered frame one Arrival time T of the first transport packet forming part
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), current time measuring said current time measuring means <4A-3> time _{T b} matches determining whether the, <4A-4> when time T _b to the current time measuring means matches the current time to be measured, No. 1 transport packets constituting a part of a picture of the f-th frame Is output from the buffer means and <4B> the second and subsequent transport packets forming a part of the picture of each frame in which the picture start data is not stored are output as <4B-1> It is obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from the arrival time T (If_Au) of the port packet (u is an integer of 1 or more). Time t
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), a time _{T c} which over time _{t d3} from <4B-2> time _{T b,} the following equation _T c _{= T} b _{+ t d3} Then, it is determined whether or not the current time measured by the current time measuring means matches <4B-3> time T _c, and the current time measured by the current time measuring means is <4B-4> time T _c. When they match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <4C> the processes <4A-1> to <4A-4> are performed. For the first transport packet forming part of the picture of the frame, the processes <4B-1> to <4B-4> are performed by the second and subsequent transport packets forming part of the picture of each frame. Pa It is characterized in that to run for Tsu door.

According to a fifth aspect of the present invention, there is provided a digital video signal recording apparatus, which comprises a reception time measuring means for measuring the arrival time of a received transport packet and arrival time information indicating the arrival time measured by the reception time measuring means. , Time information adding means for adding to the transport packet,
Picture type analyzing means for analyzing a picture type from the transport packet, type information adding means for adding picture type information indicating the picture type analyzed by the picture type analyzing means to the transport packet, arrival time information, and And a recording unit for recording the transport packet to which the picture type information is added on a recording medium.

According to another aspect of the present invention, a digital video signal reproducing apparatus records a transport packet to which arrival time information indicating arrival time of a received transport packet and picture type information indicating a picture type of a transport stream are added. Reading means for reading from the medium;
Selecting means for selecting and outputting only the transport packet to be reproduced based on the picture type information added to the transport packet read by the reading means, and adding to the transport packet selected by the selecting means Time information analyzing means for analyzing and outputting the reached time information, buffer means for temporarily holding the transport packet output from the selecting means, and arrival time output from the time information analyzing means The present invention is characterized by having a reproduction speed control means for controlling the reproduction time of the transport packet by outputting the transport packet to which the arrival time information is added from the buffer means at the time corresponding to the information.

According to a seventh aspect of the present invention, there is provided a digital video signal reproducing apparatus, wherein the reproduction speed control means includes a present time measuring means for measuring a present time at which measurement is started from an initialized time, When the output picture of the f-th frame (f is an integer of 0 or more) is transmitted as a transport packet from the 0-th to the M-th (M is a positive integer), the picture of the f-th frame The arrival time of the p-th transport packet (p is an integer of 0 or more and M or less) that constitutes a part of is expressed as T (If_Ap),
At the same time as the reproduction is started, the current time measuring means uses the measured value to arrive at the arrival time T of the first transport packet which constitutes a part of the picture of the first frame to be received first.
The measurement of the current time is started after initialization with (I0_A0), and during normal reproduction, the reproduction speed control means
7-1> It is determined whether or not the current time measured by the current time measuring means matches the time T (If_Ap) based on the arrival time information added to the transport packet. <7-2> The current time When the current time measured by the time measuring means coincides with the time T (If_Ap) based on the arrival time information added to the transport packet, the p-th trans forming a part of the picture of the f-th frame. Outputting port packets from the buffer means <7-3> The processes <7-1> and <7-2
> Represents the first part of the picture of the first frame
It is characterized in that it is executed sequentially from the transport packet.

Further, in the digital video signal reproducing apparatus according to the present invention, the reproducing speed control means includes a current time measuring means for measuring a current time when the measurement is started from the initialized time, and the reproducing means controls the selecting means. When the output picture of the f-th frame (f is an integer of 0 or more) is transmitted as a transport packet from the 0-th to the M-th (M is a positive integer), the picture of the f-th frame The arrival time of the p-th transport packet (p is an integer of 0 or more and M or less) that constitutes a part of is expressed as T (If_Ap),
At the same time as the reproduction is started, the current time measuring means uses the measured value to arrive at the arrival time T of the first transport packet which constitutes a part of the picture of the first frame to be received first.
The measurement of the current time is started after initialization with (I0_A0), and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means <8-1> arrival time of the transport packet to be reproduced. The time t _d1 obtained by subtracting the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame from T (If_Ap) is given by the following equation t _d1 = T (If_Ap) − determined by T (I0_A0), <8-2> time _{t d1} to one to the value _{t d1} / N of N min, arrival time of the No.1 transport packets constituting a part of a picture of the first numbered frame T (I
The time _{T a} which adds 0_A0), calculated from: _{T a = (t d1 / N} ) + T (I0_A0), current time measuring said current time measuring means <8-3> time _{T a} match To determine whether
<8-4> When time T _a to the current time measuring means matches the current time to be measured, to output a first p-th transport packet constituting a part of the picture of the f-th frame from the buffer means , <8-5> The process <
8-1> to <8-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame.

According to a ninth aspect of the present invention, there is provided a digital video signal reproducing apparatus including the present time measuring means for measuring the present time when the reproducing speed control means starts measurement from the initialized time, When the output picture of the f-th frame (f is an integer greater than or equal to 0) is transmitted as a transport packet from the 0-th to the M-th (M is a positive integer), the picture of the f-th frame The arrival time of the p-th transport packet (p is an integer of 0 or more and M or less) that constitutes a part of is expressed as T (If_Ap),
At the same time as the reproduction is started, the current time measuring means uses the measured value to arrive at the arrival time T of the first transport packet which constitutes a part of the picture of the first frame to be received first.
The measurement of the current time is started after initialization with (I0_A0), and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means sets the <9A> picture head data of the f-th frame. <9A-1> when outputting the first transport packet forming part of a picture
Arrival time T (I
The first time _{t d2} obtained by subtracting the arrival time T (I0_A0) of the transport packet from f_A0), calculated from: _{t d2 = T (If_A0) -T} (I0_A0), <9A-2> time _{t d2} To the value t _d2 / N obtained by _dividing N by N, the arrival time T of the first transport packet forming a part of the picture of the first frame.
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), current time measuring said current time measuring means <9A-3> time _{T b} matches determining whether the, <9A-4> when time T _b to the current time measuring means matches the current time to be measured, No. 1 transport packets constituting a part of a picture of the f-th frame <9B-1> to be reproduced from the buffer means and the second and subsequent transport packets forming a part of the picture of each frame in which the picture start data is not stored are output. It is obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from the arrival time T (If_Au) of the port packet (u is an integer of 1 or more). Time t
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), a time _{T c} which over time _{t d3} from <9B-2> time _{T b,} the following equation _T c _{= T} b _{+ t d3} Then, it is determined whether or not the current time measured by the current time measuring means matches <9B-3> time _Tc, and the current time measured by the current time measuring means is measured at <9B-4> time _Tc. When they match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <9C> the processes <9A-1> to <9A-4> are performed. For the first transport packet forming a part of the picture of the frame, the processes <9B-1> to <9B-4> are performed by the second and subsequent transport packets forming a part of the picture of each frame. Pa It is characterized in that to run for Tsu door.

According to a tenth aspect of the present invention, there is provided a digital video signal recording / reproducing method for measuring the arrival time of a received transport packet, adding arrival time information indicating the measured arrival time to the transport packet, A picture type is analyzed from the transport packet, picture type information indicating the analyzed picture type is added to the transport packet, and a transport packet with arrival time information and picture type information is recorded on a recording medium. Then, the transport packet to which the arrival time information and the picture type information are added is read from the recording medium, and only the transport packet to be reproduced is selected based on the picture type information added to the read transport packet. The selected transport package The arrival time information added to the packet is analyzed, the selected transport packet is temporarily held in the buffer means, and the arrival time information is added to the time according to the analyzed arrival time information. The present invention is characterized in that the transport packet is output from the buffer means to control the reproduction time of the transport packet.

In the digital video signal recording / reproducing method according to the eleventh aspect, the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are numbered from 0 to. When transmitted as transport packets up to the M-th (M is a positive integer), the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame Arrival time is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, the measurement of the current time is started, and during normal reproduction, <11-1> whether the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet. <11-2> When the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet, a part of the picture of the f-th frame is displayed. Output the constituent p-th transport packet from the buffer means <11-3> Processes <11-1> and <11-2>
> Represents the first part of the picture of the first frame
11. The digital video signal recording / reproducing method according to claim 10, wherein the steps are sequentially performed from the transport packet number.

Further, in the digital video signal recording / reproducing method according to the twelfth aspect, the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are numbered from 0 to. When transmitted as transport packets up to the M-th (M is a positive integer), the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame Arrival time is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, the current time measurement is started, and <1 is displayed during N (N is a positive value) double speed playback.
2-1> Time t obtained by subtracting the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame from the arrival time T (If_Ap) of the transport packet to be reproduced. the _d1, calculated from: _{t d1 = T (If_Ap) -T} (I0_A0), <12-2> time _{t d1} to one to the value _{t d1} / N divided by N, the picture of the first numbered frame one Arrival time T of the first transport packet forming part
The time _{T a} which is obtained by adding the (I0_A0), calculated by the following equation: _{T a = (t d1 / N} ) + T (I0_A0), to determine whether or not match the current time in the <12-3> time _{T a,} <12-4> at time T _a when the current time matches, the first p-th transport packet constituting a part of the picture of the f-th frame is output from said buffer means, <12-5> the process < 12
-1> to <12-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame.

In the digital video signal recording / reproducing method according to a thirteenth aspect, the pictures of the f-th frame (f is an integer of 0 or more) selected and output based on the picture type information are numbered from the 0-th. When transmitted as transport packets up to the M-th (M is a positive integer), the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame Arrival time is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, the current time measurement is started, and <1 is displayed during N (N is a positive value) double speed playback.
3A><13A-1> when the first transport packet forming part of the picture of the f-th frame storing the picture start data is output, <13A-1> arrival time T (If_A0) of the transport packet to be reproduced Arrival time T (I0_A of the first transport packet from
The time _{t d2} obtained by subtracting 0), calculated from: _{t d2 = T (If_A0) -T} (I0_A0), <13A-2> time _{t d2} to the value _{t d2} / N that one factor of N , The arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), determines whether the match is the current time in the <13A-3> time _{T b,} < to 13A-4> time T _b when the current time matches, the No.1 transport packets constituting a part of a picture of the f-th frame is output from said buffer means, storing the <13B> picture header data <13B-1> Arrival time T (If_Au) of the transport packet to be reproduced (u is an integer of 1 or more) when outputting the second and subsequent transport packets that form part of the picture of each frame )
Time t obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), time from <13B-2> time _{T b t d3}
Is _calculated by the following equation T _c = T _b + t _d3 , it is determined whether or not the current time matches <13B-3> time T _c, and the current time at <13B-4> time T _c is determined. When the times match, the u-th transport packet forming part of the picture of the f-th frame is output from the buffer means, and <13C> the process <1.
3A-1> to <13A-4> for the first transport packet forming a part of the picture of each frame, the processes <13B-1> to <13B-4> are performed for the picture of each frame. It is characterized in that it is executed for the second and subsequent transport packets forming a part of the above.

According to a fourteenth aspect of the present invention, in the digital video signal recording method, arrival time of a received transport packet is measured, arrival time information indicating the measured arrival time is added to the transport packet, and The picture type is analyzed from the transport packet, the picture type information indicating the analyzed picture type is added to the transport packet, and the transport packet with the arrival time information and the picture type information is recorded on the recording medium. It is characterized by that.

According to a fifteenth aspect of the present invention, a digital video signal reproducing method records a transport packet to which arrival time information indicating arrival time of a received transport packet and picture type information indicating a picture type of a transport stream are added. Only the transport packet read from the medium and reproduced based on the picture type information added to the read transport packet is selected, and the arrival time information added to the selected transport packet is analyzed. Then, the selected transport packet is temporarily stored in the buffer means, and at the time corresponding to the arrival time information, the transport packet to which the arrival time information is added is output from the buffer means, You can control the playback time of transport packets. It is characterized in.

In the digital video signal reproducing method according to the sixteenth aspect, the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are numbered from 0 to M. Number p (where p is an integer between 0 and M inclusive) that forms a part of the picture of the f-th frame when transmitted as transport packets up to the number (M is a positive integer) Set the time to T (I
f_Ap), the measurement value of the current time is initialized at the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame to be received at the same time as the reproduction is started. The measurement of the current time is started from <16-1>, and during the normal reproduction, whether the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet. <16-2> When the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet,
The p-th transport packet forming a part of the picture of the f-th frame is output from the buffer means.
16-3> Processing <16-1> and <16-2>
Is sequentially executed from the first transport packet forming a part of the picture of the first frame.

Further, in the digital video signal reproducing method according to the seventeenth aspect, the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are numbered from 0 to M. Number p (where p is an integer between 0 and M inclusive) that forms a part of the picture of the f-th frame when transmitted as transport packets up to the number (M is a positive integer) Set the time to T (I
f_Ap), the measurement value of the current time is initialized at the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame to be received at the same time as the reproduction is started. The measurement of the current time is started from, and at the time of N (N is a positive value) double speed reproduction, <17-
1> Arrival time T of the transport packet to be reproduced
Arrival time T of the first transport packet forming part of the picture of the first frame from (If_Ap)
The time _{t d1} obtained by subtracting (I0_A0), the following equation _t d1 = _T (If_Ap) determined by -T (I0_A0), the value was <17-2> time _{t d1} in one N-th _t d1 / N At the arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T a} which is obtained by adding the (I0_A0), calculated by the following equation: _{T a = (t d1 / N} ) + T (I0_A0), to determine whether or not match the current time in the <17-3> time _{T a,} <17-4> at time T _a when the current time matches, the first p-th transport packet constituting a part of the picture of the f-th frame is output from said buffer means, <17-5> the process < 17
It is characterized in that -1> to <17-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame.

Further, in the digital video signal reproducing method according to the eighteenth aspect, the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are numbered from 0 to M. Number p (where p is an integer between 0 and M inclusive) that forms a part of the picture of the f-th frame when transmitted as transport packets up to the number (M is a positive integer) Set the time to T (I
f_Ap), the measurement value of the current time is initialized at the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame to be received at the same time as the reproduction is started. The measurement of the current time is started from, and at the time of N (N is a positive value) double speed reproduction, <18A
> When outputting the first transport packet forming a part of the picture of the f-th frame storing the picture start data, <18A-1> From the arrival time T (If_A0) of the transport packet to be reproduced Arrival time T (I0_A0) of the first transport packet
The time _{t d2} obtained by subtracting, calculated from: _{t d2 = T (If_A0) -T} (I0_A0), the <18A-2> time _{t d2} values were one factor of N _{t d2} / N, the Arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), determines whether the match is the current time in the <18A-3> time _{T b,} < to 18A-4> time T _b when the current time matches, the No.1 transport packets constituting a part of a picture of the f-th frame is output from said buffer means, storing the <18B> picture header data <18B-1> Arrival time T (If_Au) of the transport packet to be reproduced (u is an integer of 1 or more) when outputting the second and subsequent transport packets that form part of the picture of each frame )
Time t obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from
The _d3, calculated by the following equation _{t d3 = T (If_Au) -T} (If_A0), time from <18B-2> time _{T b t d3}
Is _calculated by the following expression T _c = T _b + t _d3 , it is determined whether or not the current time matches <18B-3> time T _c , and <18B-4> current time T _c is determined. When the times match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <18C> the process <1.
8A-1> to <18A-4> for the first transport packet forming a part of the picture of each frame, the processes <18B-1> to <18B-4> are performed for the picture of each frame. It is characterized in that it is executed for the second and subsequent transport packets forming a part of the above.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION First, an MPEG2 transport stream (TS) which is a digital encoded signal received by the digital video signal recording / reproducing apparatus according to the first to third embodiments will be described. FIG. 2 shows MPEG2.
3 is a configuration diagram of a transport stream in FIG. In FIG. 2, 20 is a transport stream, 21 is a transport packet (TS packet), 22 is a transport header (TS header), 23 is a payload,
24 is a PES (Packetized Elementary Stream) packet stream, 25 is a PES packet, 26 is a PES header, 27 is a PES data area, and 28 is an elementary stream.

The transport stream 20 used in digital broadcasting is composed of TS packets 21 of 188 bytes. Each TS packet 21 has a TS
It is composed of a header 22 and a payload 23. The transport stream 20 can multiplex and transmit a plurality of data. In the TS header 22, the T
A field called a PID (packet identifier) for identifying the data of the payload 23 of the S packet 21 is included. Desired data can be extracted by combining the payloads having the same PID.

A PES packet 25 is obtained by combining the payloads 23 of the TS packets 21 having the same PID in the TS header 22. Each PES packet 25 of the PES packet stream 24 is composed of a PES header 26 and a PES packet data area 27. The length of the PES packet 25 is arbitrary. In the PES packet 25, the PES header 26 is removed and the PES
An elementary stream 28 is formed by combining the data areas 27 of the packets. The elementary stream 28 is video and audio data highly efficient coded by the MPEG2 system.

An image in MPEG2 is an I picture (intra-coded image (Intra-Pictur) for each frame.
e)), P picture (inter-frame forward predictive coded image (Predictive-Picture)), and B picture (bidirectionally predictive coded picture (Bidirectionally Predictive-Picture)). Of these, the pictures that can be decoded with the data that
Only I-pictures. Therefore, decoding an I picture is
It can be done without other P or B pictures. In addition,
Playback of P pictures and B pictures requires I pictures or other P pictures. A reproduction operation such as random access in which the context of the motion prediction of an image is broken is realized by accessing an I picture and reproducing it. Therefore, when special playback such as fast-forwarding is performed, random access occurs, so that I picture is always accessed.

FIG. 1 shows the configuration of a digital video signal recording / reproducing apparatus according to the first to third embodiments of the present invention (apparatus for implementing the digital video signal recording / reproducing method according to the first to third embodiments). It is a block diagram.

As shown in FIG. 1, the digital video signal recording / reproducing apparatus according to the first to third embodiments includes a reception time display timer 10 for measuring the arrival time of the received transport packet, and a reception time display timer. A time stamp adding unit 11 for adding a time stamp, which is arrival time information indicating the arrival time measured by the timer 10, to a transport packet, and a picture type is analyzed from the transport packet to indicate the analyzed picture type. It has a picture type analysis / flag addition unit 12 for adding a picture type flag to a transport packet, and a data recording unit 13 for recording a transport packet with a time stamp and a picture type flag on a recording medium 14.

Further, the digital video signal recording / reproducing apparatus according to the first to third embodiments includes a data reading section 15 for reading a transport packet to which a time stamp and a picture type flag are added from the recording medium 14, and a data reading section. The picture extraction unit 16 that selectively outputs only the transport packet to be reproduced based on the picture type flag added to the transport packet read by the frame 15, and the transport packet selected by the picture extraction unit 16. The time stamp extraction unit 17 that analyzes and outputs the added time stamp and the T output from the time stamp extraction unit 17
The output buffer 19 that temporarily holds the S packet and the time T that adds this time stamp to the time corresponding to the time stamp output from the time stamp extraction unit 17
The output buffer 19 outputs S packets, and the reproduction speed control unit 18 controls the reproduction time for each TS packet.

The recording medium 14 is a storage device (eg, a storage device) provided as a part of the digital video signal recording / reproducing apparatus.
Hard disk device, etc.) and a recording medium (eg, optical disk, magnetic disk, etc.) that can be inserted into and taken out from the digital video signal recording / reproducing apparatus.

The transport stream 20 received by a digital broadcasting tuner or the like (not shown) is recorded on the recording medium 1.
The process of recording in 4 is performed as follows. First, the received transport stream 20 is input to the time stamp adding unit 11. Time stamp adding unit 11
When detecting a TS packet, adds a time stamp indicating the arrival time to the TS packet. The value of this time stamp is equal to the value when the reception time display timer 10 counted up by the system clock is referred to by the reception of the TS packet as a trigger.

FIG. 3 is a diagram showing a time stamp insertion position in the digital video signal recording / reproducing apparatus according to the first to third embodiments. As shown in FIG. 3, the time stamp 31 can be inserted immediately after the sync byte 30 in the first byte of the header of the TS packet. In addition,
In the figure, 32 indicates the header (the part excluding the sync byte 30) after the time stamp 31 is inserted, and 33 indicates the payload. Further, the insertion position of the time stamp 31 is not limited to the position shown in FIG.

The TS packet (reference numeral 34 in FIG. 3) output from the time stamp adding section 11 is transferred to the picture type analyzing / flag adding section 12. Here, it is analyzed whether or not image data is present in the payload. If image data is present, the picture type, that is, I frame, P frame, or B frame is analyzed. Is inserted into the TS packet 34 as a picture type flag.

FIG. 4 is a diagram showing a picture type flag insertion position in the digital video signal recording / reproducing apparatus according to the first to third embodiments. As shown in FIG. 4, the insertion position of the picture type flag 40 can be between the synchronization byte 30 and the time stamp field 31.
However, the insertion position of the picture type flag 40 is not limited to the position shown in FIG.

The TS packet 41 to which the time stamp and the picture type are added in this way is sent to the data recording unit 13 and recorded on the recording medium 14.

Next, the reproducing process of the data recorded on the recording medium 14 will be described. The data recorded on the recording medium 14 is read by the data reading unit 15 in TS packet units. The read data is sent to the picture extraction unit 16. At the time of fast-forward reproduction, the picture extraction unit 16 uses the TS packet 41 of the read data.
The picture type flag 40 added to is analyzed. As a method of fast-forward reproduction, there are cases where only I pictures are outputted and cases where I pictures and P pictures are outputted. In either case, only when the analyzed picture type flag 40 represents a picture to be outputted, The TS packet is transferred to the time stamp extraction unit 17. At the time of this transfer, the added picture type flag is removed.

The T transferred to the time stamp extraction unit 17
The S packet 34 extracts the time stamp 31 added to the TS packet 34 and sends it to the reproduction speed control unit 18. The time stamp extraction unit 17 removes the time stamp 31 from the transport stream and transfers the transport stream to the output buffer 19. The transport stream 20 accumulated in the output buffer 19 is buffered until output permission from the reproduction speed control unit 18 is notified.

FIG. 5 is a diagram showing a reproduction speed control section in the digital video signal recording / reproducing apparatus according to the first to third embodiments. As shown in FIG. 5, the reproduction speed control unit 1
8 is composed of an output time timer 50 and a comparison unit 51.

In the reproduction speed control section 18, the comparison section 51 compares the value of the output time timer 50 counted by the system clock with the extracted time stamp value. The output time timer 50, when outputting the first TS packet,
It is initialized with the time stamp added to the TS packet.

Assuming that the value of the output time timer 50 is T and the value of the time stamp is TMS, at the time of reproduction at the normal speed, when T = TMS, the reproduction speed control unit 18
Notifies the output buffer 19 of output permission. Upon receiving the output permission, the output buffer 19 outputs the TS packet 20 stored in the buffer 19 to a demultiplexer (not shown) in the subsequent stage. The TS packet 20 transferred to the demultiplexer is separated into data corresponding to video and audio, and decoded by an audio / video decoder (not shown) to reproduce video and audio.

The configuration for data recording in the configuration of the digital video signal recording / reproducing apparatus according to the first to third embodiments (reception time display timer 10, time stamp adding section 11, picture type analysis / flag addition). The digital video signal recording device (the device that implements the digital video signal recording method according to the first to third embodiments) can be configured as an independent device from the unit 12 and the data recording unit 13).

Further, the structure for data reproduction in the structure of the digital video signal recording / reproducing apparatus according to the first to third embodiments (data reading section 15, picture extracting section 1)
6, a time stamp extraction unit 17, a reproduction speed control unit 18,
Also, from the output buffer 19), the digital video recording / reproducing apparatus (the apparatus that implements the digital video signal reproducing method according to the first to third embodiments) can be configured as an independent apparatus.

First Embodiment FIG. 6 is a diagram showing an operation during normal reproduction in the digital video signal recording / reproducing apparatus according to the first embodiment of the present invention.

As shown in FIG. 6, the TS packets read from the recording medium 14 are I_A0, I_A1, ..., I_Ai, B_A0, B_A1, ..., B_Aj, P_A0, P_A1 ,. ..., P_Ak. Here, I_Ai is i of I picture I_A.
It indicates that the packet is the TS packet including the second data. Similarly, B_Aj is a TS packet including the j-th data of B picture B_A. Similarly, P_Ak
Indicates that the TS packet includes the k-th data of the P picture P_A.

Further, as shown in FIG. 6, each of the time stamps added to each TS packet is T (I_A0), T (I_A1), ..., T (I_Ai), T (B_A0). , T (B_A1), ..., T (B_Aj), T (P_A0), T (P_A1), ..., T (P_Ak).

The time stamp T (I_A0) of the first TS packet I_A0 is extracted by the time stamp extraction unit 17, and the output time timer 50 is initialized with this value, and at the same time, the reproduction speed control unit 18 outputs the output buffer 19. Output permission has been notified to the TS and the time stamp has been removed
The packet I_A0 is output from the output buffer 19 to a demultiplexer (not shown).

The next TS packet I_A1 is similarly time stamp T (I_A1) by the time stamp extraction unit 17.
Is extracted, the value of the time stamp T (I_A1) is sent to the reproduction speed control unit 18, and the time stamp T (I_A1) is extracted.
The TS packet I_A1 from which 1) has been removed is held in the output buffer 19. The comparison unit 51 outputs the output time timer 50.
When it is detected that the value of is equal to the time stamp T (I_A1), the comparison unit 51 notifies the output buffer 19 of output permission, and the TS packet I_A1 from which the time stamp is removed is output from the output buffer 19 to the demultiplexer. To be done. Thereafter, similarly, TS packets are sequentially sent to the demultiplexer.

The digital video signal recording / reproducing apparatus according to the first embodiment controls the output timing of the TS packets temporarily stored in the output buffer 19 by the time stamp as described above. In this way, during normal reproduction, the intervals of the received TS packets are reproduced by time stamps and output to the demultiplexer, so that the rate of the transport stream can be accurately reproduced even during reproduction of the recorded transport stream. Therefore, the demultiplexer in the subsequent stage can accurately reproduce the system clock.

Further, since the rate of the transport stream can be accurately reproduced at the time of reproducing the recorded transport stream, it is not necessary to perform flow control in transferring the TS packet to the input buffer of the demultiplexer. In a general demultiplexer LSI, since the transport stream input port does not adopt the input format of the flow control method, the apparatus and method of the first embodiment has a high affinity for the demultiplexer LSI input port. .

Second Embodiment The configuration of the digital video signal recording / reproducing apparatus according to the second embodiment is the same as the configuration of the first embodiment except for the control contents of the picture extracting unit 16 and the reproduction speed control unit 18. .

The N-fold speed fast-forward playback operation in the digital video signal recording / playback apparatus according to the second embodiment is as follows.

In N (N is a positive value) double speed fast-forward reproduction, for example, only the I picture and P picture TS packets are output from the picture extraction unit 16, and the B picture TS packets are deleted. The pictures (here, I picture or P picture) of the f-th frame (f is an integer of 0 or more) output from the picture extracting unit 16 are TSs from the 0-th to the M-th (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) TS packet forming a part of the picture of the f-th frame is represented as T (If_Ap).

The output time timer 50 initializes the measured value at the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame to be received at the same time when the reproduction is started. And then start measuring the current time.

The comparison unit 51 of the reproduction speed control unit 18 <process 2-1> arrival time T of the TS packet to be reproduced.
The arrival time T (I0_A) of the first TS packet forming a part of the picture of the first frame from (If_Ap)
The time _{t d1} obtained by subtracting the 0), the following equation _t d1 = T (determined by If_Ap) -T (I0_A0), <processing 2-2> time _{t d1} was one of N frequency value _{t d1}
/ In N, the time _{T a} which adds the arrival time T (I0_A0) of No.1 TS packets constituting a part of a picture of the first numbered frame, the following equation _{T a = (t d1 / N} ) + T (I0_A0 determined by), <processing 2-3> time _T current time output time timer 50 is measured _a is determined whether a match, <processing 2-4> time _{T a} to the output time now the timer 50 to measure When the times match, the output buffer 19 outputs the p-th TS packet forming a part of the picture of the f-th frame to the demultiplexer, and <Process 2-5> from <Process 2-1> to <Process 2-1> above. Process 2-4
> Are sequentially executed from the first TS packet forming a part of the picture of the first frame.

The TS packet 21 transferred to the demultiplexer is separated into data corresponding to video and audio, and the video and audio are reproduced by decoding by the audio / video decoder.

FIG. 7 is a diagram showing an operation at double speed reproduction in the digital video signal recording / reproducing apparatus according to the second embodiment of the present invention. Here, the operation when the picture extracting unit 16 outputs only the I picture and the P picture to the subsequent stage will be described. Note that in FIG. 7, I_Ai
Is a TS packet including the i-th data of the I picture I_A, B_Aj is a TS packet including the j-th data of the B picture B_A, and P_Ak is a TS packet including the k-th data of the P picture P_A. . Further, in FIG. 7, the time stamps added to each TS packet are represented by T (I_A0), T (I_A1), ..., T (I_Ai), T (B_A0), T (B_A1) ,. ..., T (B_Aj), T (P_A0), T (P_A1), ..., T (P_Ak).

After receiving the double speed reproduction instruction, the first TS
The time stamp extraction unit 17 extracts the time stamp T (I_A0) from the packet I_A0, and the output time timer 50 is initialized with this value. At the same time, the reproduction speed control unit 18 notifies the output buffer 19 of output permission, and the TS packet I_A0 from which the time stamp has been removed.
Is output to the demultiplexer.

Similarly, the time stamp T (I_A1) of the next TS packet I_A1 is extracted by the time stamp extracting section. This value is sent to the reproduction speed control unit 18, and the value of the output time timer 50 is {T (I_A1) -T (I_A0)} / 2 + T (I_A
When the comparison unit 51 detects that it is equal to 0), output permission is notified to the output buffer 19, and the TS packet I_A1 from which the time stamp has been removed is output from the output buffer 19 to the demultiplexer.

Thereafter, similarly, the TS packets I_A2 to TS packets I_Ai (i is a positive integer) are sent to the demultiplexer. With the data thus far, one I picture I_A is decoded and displayed.

The next TS packet B_A0 read from the recording medium 14 is detected by the picture extraction unit 16 as a B picture and is deleted. Similarly, the TS packets B_A1, ..., B_Aj (j is a positive integer) are also deleted.

Since the next TS packet P_A0 read from the recording medium 14 is detected as a P picture by the picture extracting unit 16, the picture type flag is deleted and sent to the time stamp extracting unit 17 in the subsequent stage.

In the TS packet P_A0, the time stamp T (P_A0) is extracted by the time stamp extraction unit 17, this value is sent to the reproduction speed control unit 19, and the value of the output time timer 50 is {T (P_A1) -T. (I_A0)} / 2 + T (I_A
When the comparison unit 51 detects that it is equal to 0), the output buffer 19 is notified of the output permission, and the TS packet P_A1 from which the time stamp is removed is output from the output buffer 19 to the demultiplexer.

Thereafter, similarly, the TS packets P_A2 to TS packets P_Ai are sent to the demultiplexer. With the data so far, one P picture P_
A is decrypted and displayed.

As described above, the digital video signal recording / reproducing apparatus according to the second embodiment controls the output timing so that the desired reproduction speed can be achieved by the time stamp even during the M-fold fast-forward reproduction. Double-speed special playback can be achieved with accurate playback speed.

The second embodiment is the same as the first embodiment except for the points described above.

Third Embodiment The configuration of the digital video signal recording / reproducing apparatus according to the second embodiment is the same as the configuration of the second embodiment except for the control content of the reproduction speed control section 18. Second Embodiment
In the above, the same speed control is performed for all TS packets when performing fast forward reproduction at M times speed.
In the third embodiment, the same control as the speed control in the second embodiment (that is, the speed control in the fast forward reproduction at M speed) is performed only for the TS packet including the picture head, and for the other TS packets. The same control as the speed control in the first embodiment (that is, the speed control during normal reproduction) is performed.

In N (N is a positive value) double-speed fast-forward reproduction, for example, only the I picture and P picture TS packets are output from the picture extraction unit 16, and the B picture TS packets are deleted. The pictures (here, I picture or P picture) of the f-th frame (f is an integer of 0 or more) output from the picture extracting unit 16 are TSs from the 0-th to the M-th (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) TS packet forming part of the picture of the f-th frame is represented as T (If_Ap).

The output time timer 50 initializes the measured value at the arrival time T (I0_A0) of the first TS packet forming a part of the picture of the first frame to be received at the same time when the reproduction is started. And then start measuring the current time.

When outputting the 1st TS packet forming a part of the picture of the f-th frame storing the picture head data, the comparing section 51 of the reproduction speed control section 18 <Process 3A-1> reproduction Arrival time T of the first TS packet from the arrival time T (If_A0) of the target TS packet
The time _{t d2} obtained by subtracting (I0_A0), calculated from: _{t d2 = T (If_A0) -T} (I0_A0), < treatment 3A-2> time _{t d2} value was one factor of N t
the _d2 / N, the time _{T b} which is obtained by adding the arrival time T (I0_A0) of No.1 TS packets constituting a part of a picture of the first numbered frame, the following equation _{T b = (t d2 / N} ) + T ( determined by I0_A0), to determine whether a match is the current time of measuring the output time timer 50 in <process 3A-3> time _{T b,} measures the output time timer 50 in <process 3A-4> time _{T b} When the current times match, the first TS packet forming part of the picture of the fth frame is output from the output buffer 19 to the demultiplexer.

Also, the comparison unit 51 of the reproduction speed control unit 18
When outputting the second and subsequent TS packets forming a part of the picture of each frame that does not store the picture start data, <Process 3B-1> Arrival time T (If_Au) (of the TS packet to be reproduced) u is 1 or more time _{t d3} obtained from an integer) by subtracting the first TS packet arrival time T (If_A0) of the same frame, calculated by the following equation _{t d3 = T (If_Au) -T} (If_A0), < Process 3B-2> The time T _c when the time t _d3 has elapsed from the time T _b is _calculated by the following expression T _c = T _b + t _d3 = (t _d2 / N) + T (I0_A0) + T (If_Au) −T (If_A0) = {T (If_A0) -T (I0_A0)} / N + T (I0_A0) + T (If_Au) -T (If_A0), <Process 3B-3> Output time timer at time _Tc It is determined whether the current time measured by 50 matches, and <Process 3B-4> When the current time measured by the output time timer 50 matches at time T _c , a part of the picture of the f-th frame is displayed. The u-th TS packet to be formed is output from the output buffer 19 to the demultiplexer.

[Process 3A-1] to <Process 3A
-4> to <Process 3B-1> to <Process 3B-4> for the first TS packet forming a part of the picture of each frame, the second TS packet forming a part of the picture of each frame Execute for the TS packets after the number

FIG. 8 is a diagram showing an operation during double speed reproduction in the digital video signal recording / reproducing apparatus according to the third embodiment of the present invention. Here, the operation when the picture extracting unit 16 outputs only the I-picture and P-picture TS packets to the subsequent stage will be described. In FIG. 7, I_Ai is a TS packet including the i-th data of the I picture I_A, and B_Aj is j of the B picture B_A.
The TS packet including the th data, P_Ak, is a TS packet including the kth data of the P picture P_A. Further, in FIG. 7, the time stamps added to each TS packet are represented by T (I_A0), T (I_A1), ..., T (I_Ai), T (B_A0), T (B_A1) ,. ..., T (B_Aj), T (P_A0), T (P_A1), ..., T (P_Ak).

The first TS after receiving the double speed reproduction instruction
The time stamp extraction unit 17 extracts the time stamp T (I_A0) from the packet I_A0, and the output time timer 50 is initialized with this value. At the same time, the reproduction speed control unit 18 notifies the output buffer 19 of output permission, and the TS packet I_A0 from which the time stamp has been removed.
Is output to the demultiplexer.

The next TS packet I_A1 is similarly time stamp T (I_A1) by the time stamp extraction unit 17.
Is extracted. This value is sent to the reproduction speed control unit 18 and the value of the output time timer 50 is extracted as the time stamp T.
When the comparison unit 51 detects that it becomes equal to (I_A1), the output buffer 19 is notified of output permission, and the TS packet I_A1 from which the time stamp has been removed is output from the output buffer 19 to the demultiplexer.

Thereafter, similarly, TS packets I_A2 to TS packets I_Ai (i is a positive integer) are sent to the demultiplexer. With the data thus far, one I picture I_A is decoded and displayed.

The next TS packet B_A0 read from the recording medium 14 is detected by the picture extraction unit 16 as a B picture and deleted. Similarly, the TS packets B_A1, ..., B_Aj (j is a positive integer) are also deleted.

The next TS packet P_A0 read from the recording medium 14 is detected by the picture extraction unit 16 as a P picture, so the picture type flag is deleted and sent to the time stamp extraction unit 17 in the subsequent stage.

The time stamp T (P_A0) of the TS packet P_A0 is extracted by the time stamp extraction unit 17, and this value is sent to the reproduction speed control unit 18. This TS
Since the head data of the P picture is stored in the payload of the packet, the output timing control is changed as follows. That is, the value of the output time timer 50 is {T (P_
When the comparing unit 51 detects that A0) −T (I_A0)} / 2 + T (I_A0) has become equal, the output buffer 19 is notified of output permission, and the TS packet P_A0 from which the time stamp has been removed is output to the output buffer 19. To the demultiplexer.

The next TS packet P_A1 is similarly time stamp T (P_A1) by the time stamp extraction unit 17.
Is extracted. This value is sent to the reproduction speed control unit 18, but since the data other than the picture head is stored in the payload of this TS packet, the output timing is changed as follows. That is, the value of the output time timer 50 is T (P_A1) -T (P_A0) + {T (P_A0)-
When the comparison unit 51 detects that T (I_A0)} / 2 + T (I_A0), the output buffer 19 is notified of output permission, and the TS packet P_A1 from which the time stamp has been removed is output to the output buffer 19
To the demultiplexer.

Thereafter, similarly, TS packets P_A2 to TS packets P_Ai are sent to the demultiplexer. With the data so far, one P picture P_
A is decrypted and displayed.

In the digital video signal recording / reproducing apparatus according to the third embodiment, the output timing is controlled so that the desired reproduction speed can be obtained by the time stamp even during the M-speed fast-forward reproduction. It can be realized at playback speed.

In the M-speed reproduction, the second embodiment described above is used.
However, since one picture is entirely output at a transfer rate of M times, there is a possibility that the input buffer of the subsequent demultiplexer may overflow. In the third embodiment, since the second and subsequent TS packets forming a picture are output at the normal reproduction rate, the demultiplexer input buffer at the subsequent stage does not overflow.

The third embodiment is the same as the first or second embodiment except for the points described above.

[0085]

As described above, according to the digital video signal recording / reproducing apparatus of the first aspect, the arrival time information is added to the time according to the arrival time information output from the time information analyzing means. Since the TS packet being output is output from the buffer means and the reproduction time of the TS packet is controlled,
The reproduction rate of the original transport stream can be reproduced during normal reproduction, and the transport stream can be accurately output at a desired reproduction speed during special reproduction.

According to the digital video signal recording / reproducing apparatus of the second aspect, when the current time measured by the current time measuring means coincides with the time based on the arrival time information added to the TS packet, the TS packet Is output from the buffer means, the original reproduction rate of the transport stream can be reproduced during normal reproduction.

According to the digital video signal recording / reproducing apparatus of the third aspect, the time information analyzing means initializes the current time measuring means with the time information of the first TS packet at the start of the N-speed reproduction. Furthermore, at the time of N-fold speed reproduction, the time difference between the time information added to the TS packet by the reproduction speed control means and the current time information indicated by the current time measuring means is divided by N, and the time at the start of the N-speed reproduction is added. A new packet output time is obtained, and the TS packet is output from the buffer means when the current time information indicated by the current time measurement means matches this value. Therefore, the transport stream should be output at an accurate N-times playback speed. You can

According to another aspect of the digital video signal recording / reproducing apparatus of the present invention, the current time measuring means is initialized with the time information of the first TS packet at the time of starting the N-times speed reproduction, and at the time of the N-times speed reproduction. Only when the TS packet storing the picture head data of is output, the time difference between the time information added to the TS packet by the reproduction speed control means and the current time information indicated by the current time measurement means is divided by N, and A new packet output time obtained by adding the time at the start of N-speed playback is obtained, and when the current time information indicated by the current time measurement means matches this value, the TS packet output is permitted, and the data not at the beginning of the picture is payload. Let T
Since the S packet is controlled so that the TS packet interval is equal to the TS packet interval at the time of reception, the transport stream can be output at an accurate N-times playback speed, and a demultiplexer input connected to the subsequent stage can be used. You can avoid buffer overflow.

According to the digital video signal recording apparatus of the fifth aspect, arrival time information indicating the arrival time measured by the reception time measuring means is added to the TS packet, and the picture type analyzed by the picture type analyzing means is added. The picture type information shown is added to the TS packet, and the TS packet to which the arrival time information and the picture type information are added is recorded on the recording medium. Therefore, at the time corresponding to the arrival time information output from the time information analysis unit, Since the TS packet to which the arrival time information is added is output from the buffer means, the reproduction time of each TS packet can be controlled, the original reproduction rate of the transport stream can be reproduced during the normal reproduction, and the special reproduction can be performed. Sometimes the transport stream can be output accurately at the desired playback speed.

According to the digital video signal reproducing apparatus of the sixth aspect, the buffer means outputs the TS packet to which the arrival time information is added at the time corresponding to the arrival time information output from the time information analyzing means. Since the reproduction time of the TS packet is controlled, the original reproduction rate of the transport stream can be reproduced during normal reproduction, and the transport stream can be accurately output at a desired reproduction speed during special reproduction.

According to the digital video signal reproducing apparatus of the present invention, the current time measured by the current time measuring means is
When the time based on the arrival time information added to the TS packet matches, the TS packet is output from the buffer means, so that the normal reproduction rate of the transport stream can be reproduced during normal reproduction.

Further, according to the digital video signal reproducing apparatus of the present invention, the time information analyzing means initializes the present time measuring means with the time information of the first TS packet at the start of the N-speed reproduction, and At the time of N speed reproduction, the time difference between the time information added to the TS packet by the reproduction speed control means and the current time information indicated by the current time measurement means is divided by N.
A new packet output time is calculated by adding the time at the start of N-speed reproduction to this, and when the current time information indicated by the current time measurement means matches this value, the TS packet is output from the buffer means. Can be output at an accurate N times faster playback speed.

According to another aspect of the digital video signal reproducing apparatus of the present invention, the current time measuring means is initialized with the time information of the first TS packet at the start of the N-times speed reproduction, and the N-times speed reproduction is performed. Only when the TS packet storing the picture head data is output, the time difference between the time information added to the TS packet by the reproduction speed control means and the current time information indicated by the current time measurement means is divided by N, and N is added to this. A new packet output time obtained by adding the time at the start of double speed reproduction is obtained, and when this value matches the current time information indicated by the current time measuring means, the TS packet output is permitted,
For TS packets whose payload is data not at the beginning of the picture, the TS packet interval is controlled to be equal to the TS packet interval at the time of reception, so that the transport stream can be output at an accurate N-times playback speed. In addition, the overflow of the demultiplexer input buffer connected to the subsequent stage can be avoided.

According to the digital video signal recording / reproducing method of the tenth aspect, at the time corresponding to the arrival time information, the TS packet to which the arrival time information is added is output from the buffer means, and the TS packet of the TS packet is reproduced. Since the reproduction time is controlled, the reproduction rate of the original transport stream can be reproduced during normal reproduction, and the transport stream can be accurately output at the desired reproduction speed during special reproduction.

According to the digital video signal recording / reproducing method of claim 11, the TS packet is output from the buffer means when the current time to be measured coincides with the time based on the arrival time information added to the TS packet. So let's
The normal transport stream playback rate can be reproduced during normal playback.

According to the digital video signal recording / reproducing method of the twelfth aspect, the time information analyzing means initializes the current time measuring means with the time information of the first TS packet at the start of the N-speed reproduction. Furthermore, when playing back at N times speed, T
The time difference between the time information added to the S packet and the current time information indicated by the current time measurement means is divided by N, and a new packet output time is calculated by adding the time at the start of N-times speed reproduction to this value. Since the TS packet is output from the buffer means when the current time information indicated by the current time measuring means matches, the transport stream can be output at an accurate N-fold speed.

According to the digital video signal recording / reproducing method of the thirteenth aspect, at the start of N-times speed reproduction, the first TS
Initialization is performed with the time information of the packet, and the time difference between the time information added to the TS packet and the current time information is N minutes only when the TS packet storing the picture start data at the time of N-speed reproduction is output. Then, a new packet output time is calculated by adding the time at the start of N-speed playback to this, and when the current time information matches this value, output of the TS packet is permitted, and the data not at the beginning of the picture is used as the payload. As for the TS packets to be used, the TS packet interval is made equal to the TS packet interval at the time of reception, so that the transport stream can be output at an accurate N-times playback speed, and a demultiplexer connected to the subsequent stage can be used. The input buffer overflow can be avoided.

According to the digital video signal recording method of claim 14, the arrival time information indicating the measured arrival time is T
Since the picture type information indicating the analyzed picture type is added to the S packet and the TS packet is added to the TS packet and the arrival time information and the picture type information are recorded in the recording medium, the arrival time information is satisfied. It becomes possible to control the reproduction time of each TS packet by outputting the TS packet to which this arrival time information is added from the buffer means at the time, and to reproduce the original reproduction rate of the transport stream during normal reproduction. , The transport stream can be accurately output at the desired reproduction speed during special reproduction.

According to the digital video signal reproducing method of the fifteenth aspect, the TS packet to which the arrival time information is added is output from the buffer means at the time corresponding to the output arrival time information, and the TS packet Since the reproduction time is controlled, the original reproduction rate of the transport stream can be reproduced during normal reproduction, and the transport stream can be accurately output at a desired reproduction speed during special reproduction.

Further, according to the digital video signal reproducing apparatus of the sixteenth aspect, when the current time to be measured matches the time based on the arrival time information added to the TS packet,
Since the TS packet is output from the buffer means, the original reproduction rate of the transport stream can be reproduced during normal reproduction.

Further, according to the digital video signal reproducing method of the seventeenth aspect, at the time of starting the N-times speed reproduction, the time information of the first TS packet is initialized and further added to the TS packet at the N-times speed reproduction. The time difference between the time information and the current time information is divided by N, and the new packet output time is calculated by adding the time at the start of N-times speed reproduction to this, and when the current time information matches this value, the TS packet is extracted. Since it is output from the buffer means, the transport stream can be output at an accurate N-times playback speed.

According to the digital video signal reproducing method of the eighteenth aspect, at the start of the N-times speed reproduction, the initialization is performed by the time information of the first TS packet, and the picture head data at the N-times speed reproduction is stored. Only when outputting a TS packet, the time difference between the time information added to the TS packet and the current time information is divided by N, and a new packet output time obtained by adding the time at the start of N-times speed reproduction to this When the current time information indicated by the current time measuring means matches this value, output of the TS packet is permitted, and a TS packet having data other than the beginning of the picture as a payload has a TS packet interval at the time of reception. Since it is controlled to be equal to the interval, the transport stream can be output at an accurate N-times playback speed, and it can be connected to the subsequent stage. It is possible to avoid the overflow of the demultiplexer input buffer.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital video signal recording / reproducing apparatus according to Embodiments 1 to 3 of the present invention (apparatus for implementing a digital video signal recording / reproducing method according to Embodiments 1 to 3). .

FIG. 2 is a configuration diagram of a transport stream in MPEG2.

FIG. 3 is a diagram showing a time stamp insertion position in the digital video signal recording / reproducing apparatus according to the first to third embodiments of the present invention.

FIG. 4 is a diagram showing a picture type flag insertion position in the digital video signal recording / reproducing apparatus according to the first to third embodiments of the present invention.

FIG. 5 is a diagram showing a reproduction speed control unit in the digital video signal recording / reproducing apparatus according to the first to third embodiments of the present invention.

FIG. 6 is a diagram showing an operation during normal reproduction in the digital video signal recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 7 is a diagram showing an operation during double speed reproduction in the digital video signal recording / reproducing apparatus according to the second embodiment of the present invention.

FIG. 8 is a diagram showing an operation during double-speed reproduction in the digital video signal recording / reproducing apparatus according to the third embodiment of the present invention.

[Explanation of symbols]

10 reception time display timer, 11 time stamp addition unit, 12 picture type analysis / flag addition unit,
13 data recording unit, 14 recording medium, 15 data reading unit, 16 picture extracting unit, 17 time stamp extracting unit, 18 reproduction speed control unit, 19
Output buffer, 20 transport streams (T
S), 21 transport packet (TS packet), 22 transport header (TS header),
23 payload, 24 PES packet stream, 25 PES packet, 26 PES header,
27 PES data area, 28 elementary stream, 30 synchronization byte, 31 time stamp, 32 header, 33 payload, 40 picture type, 41 transport packet with picture type flag added, 50 output timer, 51
Comparison section.

Claims (18)

[Claims] 1. A reception time measuring means for measuring the arrival time of a received transport packet, and time information for adding arrival time information indicating the arrival time measured by the reception time measuring means to the transport packet. Adding means, picture type analyzing means for analyzing a picture type from the transport packet, and type information adding means for adding picture type information indicating the picture type analyzed by the picture type analyzing means to the transport packet, Recording means for recording a transport packet with arrival time information and picture type information added to a recording medium; reading means for reading the transport packet with arrival time information and picture type information added from the recording medium; Tran read by means Selecting means for selecting and outputting only the transport packet to be reproduced based on the picture type information added to the transport packet; and analyzing the arrival time information added to the transport packet selected by the selecting means. The time information analyzing means for outputting, the buffer means for temporarily holding the transport packet output from the selecting means, and the arrival time at the time corresponding to the arrival time information output from the time information analyzing means. A digital video signal recording / reproducing apparatus comprising: a reproduction speed control means for outputting a transport packet to which time information is added from the buffer means to control a reproduction time of the transport packet. 2. The reproduction speed control means includes a current time measuring means for measuring a current time when the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selecting means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
The measurement of the current time is started after initialization with (I0_A0), and during normal reproduction, the reproduction speed control means <2-
1> It is determined whether or not the current time measured by the current time measuring means matches the time T (If_Ap) based on the arrival time information added to the transport packet, and <2-2> the current time measurement. When the current time measured by the means matches the time T (If_Ap) based on the arrival time information added to the transport packet, the p-th transport packet forming a part of the picture of the f-th frame Is output from the buffer means <2-3>, and the processes <2-1> and <2-2> are
The digital video signal recording / reproducing apparatus according to claim 1, wherein the first transport packet forming part of the picture of the first frame is sequentially executed. 3. The reproduction speed control means includes a current time measurement means for measuring the current time when the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selection means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
The measurement of the current time is started after initializing with (I0_A0), and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means <3-1> arrival time of the transport packet to be reproduced. The time t obtained by subtracting the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame from T (If_Ap)
The _d1, calculated from: _{t d1 = T (If_Ap) -T} (I0_A0), <3-2> time _{t d1} to one to the value _{t d1} / N divided by N, the picture of the first numbered frame one Arrival time T (I
The time _{T a} which adds 0_A0), calculated from: _{T a = (t d1 / N} ) + T (I0_A0), current time measuring said current time measuring means <3-3> time _{T a} match To determine whether
<3-4> When time T _a to the current time measuring means matches the current time to be measured, to output a first p-th transport packet constituting a part of the picture of the f-th frame from the buffer means , <3-5> Processing <
2. The digital video signal recording / reproducing according to claim 1, wherein steps 3-1> to <3-4> are executed in order from the first transport packet forming a part of the picture of the first frame. apparatus. 4. The reproduction speed control means includes a current time measurement means for measuring the current time when the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selection means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
The measurement of the current time is started after the initialization at (I0_A0), and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means <4A> of the f-th frame storing the picture start data. <4A-1> When outputting the first transport packet forming part of a picture, <4A-1> arrival time T (If_) of the transport packet to be reproduced
Arrival time T of the first transport packet from A0)
The time _{t d2} obtained by subtracting (I0_A0), calculated from: _{t d2 = T (If_A0) -T} (I0_A0), <4A-2> time _{t d2} values were one factor of N _t d2 / N At the arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), current time measuring said current time measuring means <4A-3> time _{T b} matches determining whether the, <4A-4> when time T _b to the current time measuring means matches the current time to be measured, No. 1 transport packets constituting a part of a picture of the f-th frame Is output from the buffer means and <4B> the second and subsequent transport packets forming a part of the picture of each frame in which the picture start data is not stored are output as <4B-1> It is obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from the arrival time T (If_Au) of the port packet (u is an integer of 1 or more). Time t
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), a time _{T c} which over time _{t d3} from <4B-2> time _{T b,} the following equation _T c _{= T} b _{+ t d3} Then, it is determined whether or not the current time measured by the current time measuring means matches <4B-3> time T _c, and the current time measured by the current time measuring means is <4B-4> time T _c. When they match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <4C> the processes <4A-1> to <4A-4> are performed. For the first transport packet forming part of the picture of the frame, the processes <4B-1> to <4B-4> are performed by the second and subsequent transport packets forming part of the picture of each frame. Pa Digital video signal recording and reproducing apparatus according to claim 1, wherein the executing the Tsu and. 5. A reception time measuring means for measuring the arrival time of a received transport packet, and time information for adding arrival time information indicating the arrival time measured by the reception time measuring means to the transport packet. Adding means, picture type analyzing means for analyzing a picture type from the transport packet, type information adding means for adding picture type information indicating the picture type analyzed by the picture type analyzing means to the transport packet, A digital video signal recording device, comprising: a recording unit that records a transport packet to which arrival time information and picture type information are added on a recording medium. 6. Read means for reading from the recording medium a transport packet to which arrival time information indicating the arrival time of the received transport packet and picture type information indicating the picture type of the transport stream are added, and the reading means. Selecting means for selecting and outputting only the transport packet to be reproduced based on the picture type information added to the transport packet read by the, and added to the transport packet selected by the selecting means. According to the arrival time information output from the time information analysis unit, the time information analysis unit that analyzes and outputs the arrival time information, the buffer unit that temporarily holds the transport packet output from the selection unit, This arrival time information is added to the And a transport packet is output from said buffer means, the digital video signal reproducing apparatus characterized by comprising a playback speed control means for controlling the reproduction time of the transport packet. 7. The reproduction speed control means includes a current time measurement means for measuring a current time at which the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selection means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
After the initialization with (I0_A0), the measurement of the current time is started, and at the time of normal reproduction, the reproduction speed control means <7-
1> It is determined whether or not the current time measured by the current time measuring means matches the time T (If_Ap) based on the arrival time information added to the transport packet, and <7-2> the current time measurement. When the current time measured by the means matches the time T (If_Ap) based on the arrival time information added to the transport packet, the p-th transport packet forming a part of the picture of the f-th frame Is output from the buffer means, <7-3> and the processes <7-1> and <7-2> are
7. The digital video signal reproducing apparatus according to claim 6, wherein the first transport packet forming a part of the picture of the first frame is sequentially executed. 8. The reproduction speed control means includes a current time measurement means for measuring the current time at which the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selection means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
The measurement of the current time is started after initialization with (I0_A0), and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means <8-1> arrival time of the transport packet to be reproduced. Time t obtained by subtracting arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame from T (If_Ap)
_{d1 is obtained} by the following equation t _d1 = T (If_Ap) −T (I0_A0), and <8-2> is set to a value t _d1 / N obtained by dividing the time t _d1 by ₁ / N, and the _d Arrival time T (I
The time _{T a} which adds 0_A0), calculated from: _{T a = (t d1 / N} ) + T (I0_A0), current time measuring said current time measuring means <8-3> time _{T a} match To determine whether
<8-4> When time T _a to the current time measuring means matches the current time to be measured, to output a first p-th transport packet constituting a part of the picture of the f-th frame from the buffer means , <8-5> The process <
7. The digital video signal reproducing apparatus according to claim 6, wherein 8-1> to <8-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame. . 9. The reproduction speed control means includes a current time measurement means for measuring the current time when the measurement is started from the initialized time, and the f-th (f is an integer of 0 or more) output from the selection means. )
When the picture of the frame No. 0 is transmitted as a transport packet from the number 0 to the number M (M is a positive integer), the p-th frame forming part of the picture of the frame No. f.
The arrival time of the transport packet of No. (p is an integer of 0 or more and M or less) is represented as T (If_Ap), and the current time measurement means receives the measurement value at the same time as the start of reproduction, and is the first frame to receive first Arrival time T of the first transport packet forming part of the picture of
After the initialization of (I0_A0), the measurement of the current time is started, and at the time of N (N is a positive value) double speed reproduction, the reproduction speed control means sets <9A> picture head data of the f-th frame. <9A-1> When outputting the first transport packet forming a part of a picture, <9A-1> arrival time T (If_) of the transport packet to be reproduced
Arrival time T of the first transport packet from A0)
The time _{t d2} obtained by subtracting (I0_A0), calculated from: _{t d2 = T (If_A0) -T} (I0_A0), <9A-2> time _{t d2} values were one factor of N _t d2 / N At the arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), current time measuring said current time measuring means <9A-3> time _{T b} matches determining whether the, <9A-4> when time T _b to the current time measuring means matches the current time to be measured, No. 1 transport packets constituting a part of a picture of the f-th frame <9B-1> to be reproduced from the buffer means and the second and subsequent transport packets forming a part of the picture of each frame in which the picture start data is not stored are output. It is obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from the arrival time T (If_Au) of the port packet (u is an integer of 1 or more). Time t
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), a time _{T c} which over time _{t d3} from <9B-2> time _{T b,} the following equation _T c _{= T} b _{+ t d3} Then, it is determined whether or not the current time measured by the current time measuring means matches <9B-3> time _Tc, and the current time measured by the current time measuring means is measured at <9B-4> time _Tc. When they match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <9C> the processes <9A-1> to <9A-4> are performed. For the first transport packet forming a part of the picture of the frame, the processes <9B-1> to <9B-4> are performed by the second and subsequent transport packets forming a part of the picture of each frame. Pa Digital video signal reproducing apparatus according to claim 6, wherein the executing the Tsu and. 10. The arrival time of a received transport packet is measured, arrival time information indicating the measured arrival time is added to the transport packet, and a picture type is analyzed from the transport packet, The picture type information indicating the analyzed picture type is added to the transport packet, the transport packet with the arrival time information and the picture type information is recorded in a recording medium, and the arrival time information and the picture are recorded from the recording medium. The transport packet to which the type information is added is read, and only the transport packet to be reproduced is selected based on the picture type information added to the read transport packet, and is added to the selected transport packet. The arrival time information The selected transport packet is temporarily held in the buffer means, and the transport packet to which the arrival time information is added is output from the buffer means at a time corresponding to the analyzed arrival time information. , A method of recording and reproducing a digital video signal, characterized in that the reproduction time of a transport packet is controlled. 11. The pictures of the f-th (f is an integer of 0 or more) frames selected and output based on the picture type information are transport from the 0-th to the M-th frames (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, at the time of normal reproduction, <11-1> whether the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet. <11-2> When the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet, a part of the picture of the f-th frame is displayed. Output the constituent p-th transport packet from the buffer means <11-
3> The above processes <11-1> and <11-2> are first performed.
11. The digital video signal recording / reproducing method according to claim 10, wherein the first transport packet forming a part of the picture of the No. frame is sequentially executed. 12. The pictures of the f-th (f is an integer of 0 or more) frames selected and output based on the picture type information are transport from the 0-th to the M-th (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, the current time measurement is started, and during N (N is a positive value) double speed reproduction, <12-1>
Arrival time T (If of the transport packet to be reproduced)
_Ap) from the arrival time T (I0_) of the first transport packet that forms part of the picture of the first frame.
The time _{t d1} obtained by subtracting the A0), calculated from: _{t d1 = T (If_Ap) -T} (I0_A0), the value _{t d1} / N was <12-2> time _{t d1} in one N minutes , The arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T a} which is obtained by adding the (I0_A0), calculated by the following equation: _{T a = (t d1 / N} ) + T (I0_A0), to determine whether or not match the current time in the <12-3> time _{T a,} <12-4> at time T _a when the current time matches, the first p-th transport packet constituting a part of the picture of the f-th frame is output from said buffer means, <12-5> the process < 12
11. The digital video signal recording / reproducing method according to claim 10, wherein steps -1> to <12-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame. . 13. The pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are transport from the 0-th to the M-th (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. The measurement of the current time is started after that, and <13A> is the first transport packet that forms part of the picture of the f-th frame that stores the picture start data during N (N is a positive value) double-speed playback. <13A-1>, the time t _d2 obtained by subtracting the arrival time T (I0_A0) of the first transport packet from the arrival time T (If_A0) of the transport packet to be reproduced is expressed by the following formula t. _d2 = determined by T (If_A0) -T (I0_A0) , the <13A-2> time _{t d2} values were one factor of N _{t d2} / N, first numbered frame Arrival time T of the No.1 transport packet constituting a part of the picture
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), determines whether the match is the current time in the <13A-3> time _{T b,} < to 13A-4> time T _b when the current time matches, the No.1 transport packets constituting a part of a picture of the f-th frame is output from said buffer means, storing the <13B> picture header data <13B-1> Arrival time T (If_Au) of the transport packet to be reproduced (u is an integer of 1 or more) when outputting the second and subsequent transport packets that form part of the picture of each frame )
Time t obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from
The _d3, determined by the following equation _{t d3 = T (If_Au) -T} (If_A0), time from <13B-2> time _{T b t d3}
Is _calculated by the following equation T _c = T _b + t _d3 , it is determined whether or not the current time matches <13B-3> time T _c, and the current time at <13B-4> time T _c is determined. When the times match, the u-th transport packet forming part of the picture of the f-th frame is output from the buffer means, and <13C> the process <1.
3A-1> to <13A-4> for the first transport packet forming a part of the picture of each frame, the processes <13B-1> to <13B-4> are performed to the picture of each frame. 11. The digital video signal recording / reproducing method according to claim 10, wherein the second and subsequent transport packets forming a part of the above are executed. 14. An arrival time of a received transport packet is measured, arrival time information indicating the measured arrival time is added to the transport packet, and a picture type is analyzed from the transport packet, A digital video signal recording method, characterized in that picture type information indicating the analyzed picture type is added to the transport packet, and the transport packet added with arrival time information and picture type information is recorded on a recording medium. .. 15. A transport packet to which arrival time information indicating the arrival time of the received transport packet and picture type information indicating the picture type of the transport stream is added is read from a recording medium, and the read transport is read. Only the transport packet to be reproduced is selected based on the picture type information added to the port packet, the arrival time information added to the selected transport packet is analyzed, and the selected transport packet is analyzed. Controlling the reproduction time of the transport packet by temporarily storing in a buffer means, outputting a transport packet to which the arrival time information is added at a time corresponding to the arrival time information, from the buffer means. Video signal reproduction method characterized by 16. The transport of the pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information from the 0-th to the M-th (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Then, the measurement of the current time is started, and during normal reproduction, <16-1> whether the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet. <16-2> When the measured current time matches the time T (If_Ap) based on the arrival time information added to the transport packet, a part of the picture of the f-th frame The p-th transport packet to be configured is output from the buffer means <16-
3> The above processes <16-1> and <16-2>
16. The digital video signal reproducing method according to claim 15, wherein the first transport packet forming a part of the picture of the No. frame is sequentially executed. 17. The pictures of the f-th (f is an integer of 0 or more) frame selected and output based on the picture type information are transport from the 0-th to the M-th (M is a positive integer) When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. Measurement of the current time is started, and at the time of N (N is a positive value) double speed reproduction, <17-1>
Arrival time T (If of the transport packet to be reproduced)
_Ap) from the arrival time T (I0_) of the first transport packet that forms part of the picture of the first frame.
The time _{t d1} obtained by subtracting the A0), calculated from: _{t d1 = T (If_Ap) -T} (I0_A0), the value _{t d1} / N was <17-2> time _{t d1} in one N minutes , The arrival time T of the first transport packet forming part of the picture of the first frame
The time _{T a} which is obtained by adding the (I0_A0), calculated by the following equation: _{T a = (t d1 / N} ) + T (I0_A0), to determine whether or not match the current time in the <17-3> time _{T a,} <17-4> at time T _a when the current time matches, the first p-th transport packet constituting a part of the picture of the f-th frame is output from said buffer means, <17-5> the process < 17
16. The digital video signal reproducing apparatus according to claim 15, wherein -1> to <17-4> are sequentially executed from the first transport packet forming a part of the picture of the first frame. 18. The pictures of the f-th (f is an integer of 0 or more) frames selected and output based on the picture type information are from the 0-th to the M-th pictures (M is a positive integer). When transmitted as a packet, the arrival time of the p-th (p is an integer of 0 or more and M or less) transport packet forming part of the picture of the f-th frame is T
Simultaneously with the start of reproduction, the measurement value of the current time is initialized with the arrival time T (I0_A0) of the first transport packet forming a part of the picture of the first frame received first. The measurement of the current time is started after that, and <18A> is the first transport packet that forms part of the picture of the f-th frame that stores the picture start data during N (N is a positive value) double-speed playback. <18A-1>, the time t _d2 obtained by subtracting the arrival time T (I0_A0) of the first transport packet from the arrival time T (If_A0) of the transport packet to be reproduced is expressed by the following equation t. _d2 = determined by T (If_A0) -T (I0_A0) , the <18A-2> time _{t d2} values were one factor of N _{t d2} / N, first numbered frame Arrival time T of the No.1 transport packet constituting a part of the picture
The time _{T b} which is obtained by adding the (I0_A0), calculated from: _{T b = (t d2 / N} ) + T (I0_A0), determines whether the match is the current time in the <18A-3> time _{T b,} < to 18A-4> time T _b when the current time matches, the No.1 transport packets constituting a part of a picture of the f-th frame is output from said buffer means, storing the <18B> picture header data <18B-1> Arrival time T (If_Au) of the transport packet to be reproduced (u is an integer of 1 or more) when outputting the second and subsequent transport packets that form part of the picture of each frame )
Time t obtained by subtracting the arrival time T (If_A0) of the first transport packet of the same frame from
The _d3, calculated by the following equation _{t d3 = T (If_Au) -T} (If_A0), time from <18B-2> time _{T b t d3}
Is _calculated by the following expression T _c = T _b + t _d3 , it is determined whether or not the current time matches <18B-3> time T _c , and <18B-4> current time T _c is determined. When the times match, the u-th transport packet forming a part of the picture of the f-th frame is output from the buffer means, and <18C> the process <1.
8A-1> to <18A-4> for the first transport packet forming a part of the picture of each frame, the processes <18B-1> to <18B-4> are performed for the picture of each frame. 16. The digital video signal reproducing method according to claim 15, wherein the second and subsequent transport packets forming a part of the above are executed.