JP2003125355A - Automatic reproduction adjusting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide automatic AV reproduction adjusting equipment which restrains MPEG data to a minimum which are abolished on a TV receiver side and enables smooth reproduction when reference time and reproduction time information of the MPEG data sent by digital TV broadcast have many errors. SOLUTION: An AV decoding part 12 of a TV receiving terminal 10 which receives the MPEG data transmitted from a broadcast station and performs reproduction processing is equipped with a difference information storing part 23 which stores difference information calculated on the basis of reproduction time contained in the received MPEG data, a difference analyzing part 22 which refers the difference information stored in the difference information storing part 23, analyzes the state of distribution and calculates difference upper limit and lower limit values optimum to difference comparison, and a difference comparing part 21 which adjusts reproduction timing on the basis of the difference upper limit and lower limit values calculated by the difference analyzing part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction automatic adjusting device for performing AV reproduction control or the like on the receiving device side in digital TV broadcasting based on reproduction time information attached to MPEG data of image and sound. is there.

[0002]

2. Description of the Related Art In recent years, with the advancement of advanced information technology, digitalization has progressed also in the field of TV broadcasting, BS digital TV broadcasting has been started in 2000, and terrestrial digital TV broadcasting has been started in 2003.
It is scheduled to start in the year.

Image and audio data in digital TV broadcasting are transmitted from the broadcasting station side together with a reference time as MPEG packet data to which reproduction time information is added.
On the receiving TV terminal side, the image (VIDEO) and the audio (AUD) are recorded based on the scheduled reproduction time information based on this reference time.
(IO) is being played.

However, in the digital TV broadcasting that is actually used, the reference time and the scheduled reproduction time include an error, which is a cause of hindering the smooth synchronous reproduction of the image and the sound on the receiving TV terminal side.

As an example of solving the problem, Japanese Patent Laid-Open No. 09-2
Japanese Patent No. 84759 discloses a technique in which a reference time counter independent of the transmission side is used and synchronous reproduction is enabled by utilizing the difference from the scheduled reproduction time.

In the digital TV broadcasting, on the receiving TV terminal side, when the scheduled reproduction time added to the transmitted MPEG data is behind the reference time, the MPEG data is temporarily stored in the memory for the difference time. The playback timing is set, but due to the limited amount of storage memory,
MPEG data having a certain difference or more is discarded.

On the contrary, when the scheduled playback time is ahead of the reference time, control is performed to discard the playback of the MPEG data having a certain difference or more.

[0008]

However, when the reference time itself is transmitted with a certain error, the scheduled playback time is always delayed or advanced, and the difference exceeds the upper limit value. There is a problem that smooth synchronous reproduction cannot be performed because the amount of MPEG data to be discarded increases and the width for adjusting the reproduction timing becomes narrow.

The present invention has been made to solve the above-mentioned problems, and has a mechanism for collecting and analyzing reproduction time information included in MPEG data, and automatically determines the optimum upper and lower limit values of the difference. MPEG discarded by doing
It is an object of the present invention to provide a reproduction automatic adjustment device that minimizes data and enables smooth reproduction even for MPEG data transmitted with a reference time including an error.

[0010]

According to a first aspect of the present invention, there is provided a reproduction automatic adjusting device for performing a reproduction process by receiving information data having reproduction time information to be transmitted. Difference information storage means for storing the difference information calculated based on the reproduction time included in, and the difference information stored in the difference information storage means are analyzed to analyze the distribution status, and the difference upper limit optimum for difference comparison The difference analysis unit that calculates the lower limit value and the difference upper limit that the difference analysis unit calculates
And a difference comparison means for adjusting the reproduction timing based on the lower limit value.

According to the automatic reproduction adjustment device of the first aspect, even if there is an error between the reproduction time of MPEG data received as a digital TV broadcast and the reference time, the automatic analysis and control can be performed within the device. VIDE to be destroyed
It is possible to provide a digital TV receiving terminal that can minimize O data and AUDIO data and that can smoothly reproduce images and sounds.

An automatic reproduction adjusting apparatus according to a second aspect further comprises channel information storage means for storing channel information indicating a reception state of each channel, and the difference information storage means comprises:
The difference information is stored for each channel, and the difference analysis means
By referring to the channel management information stored in the channel information storage means, the difference information of the specific channel stored in the difference information storage means is determined to be overwritten, and the difference information of the new channel is registered. Upper limit of difference for each
It determines the lower limit.

According to the automatic reproduction adjusting device of the second aspect, the same effect as that of the first aspect can be obtained.

According to a third aspect of the present invention, there is provided the automatic reproduction adjusting apparatus according to the second aspect, wherein the channel management information is a set of a cumulative reception time and a reception count.

According to the automatic reproduction adjusting device of the third aspect, the same effect as that of the second aspect can be obtained.

According to a fourth aspect of the present invention, there is provided the automatic reproduction adjusting apparatus according to the first aspect, further comprising timer processing means for determining a timer value for holding and managing the difference information based on the bit rate information, and the difference analysis means, According to the timer value determined by the timer processing means, unnecessary difference information is deleted from the difference information stored in the difference information storage means.

According to the automatic reproduction adjusting device of the fourth aspect, the same effect as that of the first aspect can be obtained.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a block diagram showing the arrangement of an AV reproduction automatic adjustment apparatus according to the first embodiment.

The AV reproduction automatic adjusting apparatus of the first embodiment, that is, the TV receiving device and the digital TV receiving terminal 10 are D
It is composed of an EMUX unit 11, an AV decoding unit 12, and a reproducing unit 13.

The DEMUX unit 11 receives information data including reproduction time information received from a broadcasting station, for example, an MPEG transport stream notified from the broadcasting station, and uses the received MPEG transport stream as a reference time and MPEG VIDEO data ( Hereinafter referred to as VIDEO data) and MPEG AUDIO data (hereinafter referred to as AUD)
I / O data and description)
Notify the decoding unit 12.

The AV decoding unit 12 includes a difference comparing unit 21.
, Difference analysis unit 22, difference information storage unit 23, VID
EO decoder unit 24, AUDIO decoder 25, delay memories 26 and 27, VIDEO output unit 28, AU
And a DIO output unit 29.

The difference comparison unit 21 receives each data notified from the DEMUX unit 11, and calculates difference information from the reference time and the reproduction time of the AUDIO data or VIDEO data. When the power is turned on, a fixed number of reference times, reproduction times, and difference information are notified to the difference analysis unit 22, and the difference upper and lower limits are acquired only once after the power is turned on. Unnecessary AUDIO data and VIDEO data are discarded by using the difference upper and lower limits acquired from the difference analysis unit 22, and only valid data is VIDEO.
The O decoder unit 24 and the AUDIO decoder unit 25 are notified.

The difference analysis unit 22 registers the difference information notified from the difference comparison unit 21 in the difference information storage unit 23, and based on the plurality of difference information stored in the difference information storage unit 23, the difference upper and lower limit values. Is calculated.

The difference information storage unit 23 stores difference management information for managing the difference information notified from the difference analysis unit 22.

FIG. 2 is a diagram showing an example of contents stored in the difference information storage unit 23. The difference management information is stored as a set of reference time, reproduction time, and difference information for each data.

The VIDEO decoder section 24 decodes the VIDEO data notified from the difference comparison section 21 and sends it to the delay memory section 26.

The AUDIO decoder unit 25 decodes the AUDIO data notified from the difference comparison unit 21 and sends it to the delay memory 27.

The delay memories 26 and 27 receive the received VID.
Temporarily stores and holds EO data and AUDIO data,
The target data is sent to the VIDEO output unit 28 or the AUDIO output unit 29 at the reproduction timing of each data.

The VIDEO output section 28 has a delay memory 26.
The VIDEO data notified by
It is converted into an O signal and transmitted to the reproducing unit 13.

The AUDIO output section 29 is used for the delay memory 27.
VIDEO data notified from the analog AUDI
It is converted into an O signal and transmitted to the reproducing unit 13.

The reproducing section 13 reproduces by outputting the VIDEO signal and the AUDIO signal notified from the AV decoding section 12 to a monitor or a speaker.

FIG. 3 is a flow chart showing the operation of the difference analysis section 22 in the first embodiment. The operation of calculating the difference upper limit / lower limit values when the difference information is received from the difference comparison unit 21 will be described with reference to FIG.

First, the power of the digital TV receiving terminal is turned on.
Then, the held difference upper and lower limits are initialized (step S41).

Next, the difference information notified from the difference comparison unit 21 is received (step S42), and it is determined whether or not the number of samples of the received difference information has reached the determined amount (step S43).

When it is determined that the number of decisions is reached (the number of decisions is reached in step S43), the average value (step S44), the allowable width (step S45), and the difference upper and lower limit values are obtained based on the plurality of sampled difference information. The calculation of (step S46) is performed.

On the other hand, when it is determined that the time has not been reached (step S4
3 has not been reached), the process proceeds to step S42.

Finally, the difference upper limit
The lower limit value is updated (step S47), and step S4
Transition to 2.

FIG. 4 is a flow chart showing the operation of the difference comparison section 21 in the first embodiment. Referring to FIG. 4, reference time and VIDEO from the DEMUX unit 11
The operation when receiving data and AUDIO data will be described.

First, the power of the digital TV receiving terminal 10 is turned on, and the DEMUX unit 11 outputs the reference time and VIDEO.
Data and AUDIO data are received (step S5
1).

Next, the reference time and VIDEO data and AU
Difference information is extracted based on the reproduction time included in the DIO data (step S52), and it is determined whether or not the number of samples of the extracted difference information has reached a certain number (step S53).

When it is determined that the difference has not been reached (step S53 has not been reached), the difference information is notified to the difference analysis unit 22 (step S53).
54), the difference upper limit / lower limit values are read from the difference analysis unit 22 (step S55).

On the other hand, when it is determined that the number has reached the fixed number (step S53 is the fixed number), the process proceeds to step S56.

Difference information between VIDEO data and AUDIO data and the difference upper limit read from the difference analysis unit 22
When it is compared with the lower limit value (step S56) and it is determined that it is within the range (step S56 is within the range), the VIDEO data is sent to the VIDEO decoder section 24 and the AUDIO data is sent to the AUDIO decoder section 25 (step S5).
7). On the other hand, when it is determined to be out of the range (step S56 is out of range), the VIDEO data or the AUDIO data is discarded, and the process proceeds to step S51.

By the above processing, the reproduction timing adjusting operation is performed, and the optimum upper limit value of the difference is automatically determined to minimize the discarded VIDEO data and AUDIO data, and transmit with the reference time including an error. It is possible to smoothly reproduce the created VIDEO data and AUDIO data.

(Specific Flow in First Embodiment) Here, a flow in which each unit of the first embodiment processes data when the AV decoder 12 receives actual AUDIO data will be described.

When the reference time is 09:45:59, the reproduction time from the DEMUX unit 11 is 09:45:56.
When the difference comparison unit 21 receives the AUDIO data with the difference, the difference information is calculated as -3. The difference comparison unit 21
The difference analysis unit 22 calculates the reference time, the reproduction time, and the difference information.
Send to. The difference comparison unit 21 sends the AUDIO data to the DEMU.
The same operation is performed each time it is received from the X unit 11.

Upon receiving the reference time, the reproduction time, and the difference information, the difference analysis unit 22 newly adds and holds them as one item in the management table of the difference information storage unit 23 (FIG. 2).

If the total number of items has reached 1000, the average value of the AUDIO differences is calculated by simple addition averaging (FIG. 12). It is assumed here that the average value m is −2.5. Furthermore, if the standard deviation of the AUDIO difference is calculated to be 4.4, the triple of 13.2 is regarded as the allowable width δ. As a result, the upper limit difference value M2 = + 10.
6, the lower limit difference value M1 = −15.6 is calculated,
Will be updated.

When the difference comparison unit 21 receives, for example, data of difference = + 8 as new AUDIO data,
Assuming that it is within the range of the upper and lower limit difference value, AUD
Data is passed to the IO decoder 25. But for example, the difference =
When the data of +12 is received, the data is discarded because it is out of the range.

(Embodiment 2) A second embodiment of the present invention will be described with reference to FIGS.

FIG. 5 is a block diagram showing the arrangement of an AV reproduction automatic adjusting apparatus according to the second embodiment.

The AV reproduction automatic adjusting apparatus of the second embodiment, that is, the receiving terminal 10 is composed of a DEMUX section 11, an AV decoding section 12 and a reproducing section 13. Furthermore, the AV decoding section 12 is a difference information storage section. 23, a VIDEO decoder section 24, an AUDIO decoder 25, delay memories 26 and 27, a VIDEO output section 28, and an AUDIO.
An output unit 29 is provided in the same manner as in the first embodiment, but in the second embodiment, the difference comparison unit 21 and the difference analysis unit 22 are deleted and a dynamic difference comparison unit is used instead. 31, a difference analysis unit with channel 32, and a channel information storage unit 33 are added.

The components newly added in the second embodiment will be described.

The dynamic difference comparison unit 31 is included in the DEMUX unit 11
Receiving each data notified from, the reference time and AUDI
The difference information is calculated from the reproduction time of the O data or the VIDEO data. The channel information, the reference time, and the difference information are notified to the channel-equipped difference analysis unit 32, the difference upper limit / lower limit values are acquired from the channel-equipped difference analysis unit 32 each time, and unnecessary AUDIO is used by using the acquired difference upper limit / lower limit values. Data and VID
The EO data is discarded, and only valid data is notified to the VIDEO decoder unit 24 and the AUDIO decoder unit 25.

The channel information storage unit 33 stores the channel management information notified from the channel-attached difference analysis unit 32. The channel management information is information in which the cumulative reception time and the number of times of reception are paired for each channel.

FIG. 6 shows the difference information storage unit 23 with channels.
3 is a diagram showing an example of stored contents of a channel information storage unit 33. FIG.

The difference management information with a channel is stored as a set of the reference time, reproduction time, and difference information of each data for each channel. Of the hundreds of channels used in digital TV broadcasting, the storage capacity that can be held in the digital TV receiving terminal 10 is limited, and only about 10 to 20 channels can be held. The difference information storage unit 23 in FIG. 6 shows the number of channels that can be held as 3, but it is obvious that the number is not limited to this. Channel information storage unit 3
3 stores channel management information in which a cumulative reception time and the number of times of reception for each channel are paired.

The channel-attached difference analysis unit 32 receives the channel information and the difference information from the dynamic difference comparison unit 31, and determines whether the channel currently undergoing the reception process has been changed. If it is determined that the channel has been changed, the cumulative reception time and the number of receptions in the old channel of the channel information storage unit 33 are updated. The difference information of the channel to be deleted is determined from the difference information storage unit 23, and the difference information of the newly received channel is overwritten and registered.

An example of the method of determining the channel to be deleted is shown below.

First, the information stored in the channel information storage unit 33 is referred to retrieve and acquire the minimum cumulative reception time in all the channels, and then the acquired minimum cumulative reception time is equal to or less than 60 seconds. Of all the channels having the cumulative reception time, the channel having the smallest number of receptions is determined as the deletion target channel.

FIG. 7 is a flow chart showing the operation of the difference analysis unit with channel 32 in the second embodiment.
An operation of calculating the difference upper limit / lower limit values when the difference information is received from the dynamic difference comparison unit 31 will be described with reference to FIG. 7.

First, when the power of the digital TV receiving terminal 10 is turned on, the information held in the difference information storage unit 23 and the channel information storage unit 33 is initialized (step S71).

Next, the channel information and the difference information notified from the dynamic difference comparison unit 31 are received (step S7).
2) Based on the received channel information, it is determined whether the channel currently undergoing the reception process has been changed (step S73).

When it is determined that there is a change (step S73)
Is changed), and the cumulative reception time and the number of receptions in the old channel of the channel information storage unit 33 are updated (step S7).
4) The difference information of the channel to be deleted is determined from the difference information storage unit 23, and the difference information of the newly received channel is overwritten and registered (step S75).

On the other hand, when it is determined that there is no change (no change in step S73), the process proceeds to step S76.

Next, based on the plurality of pieces of difference information stored in the difference information storage unit 23, the average value (step S76), the allowable width (step S77), and the difference upper limit / lower limit values (step S7).
8) is calculated.

Finally, the difference upper limit /
The lower limit value is updated (step S79), and step S7
Transition to 2.

FIG. 8 is a flow chart showing the operation of the dynamic difference comparison unit 31 in the second embodiment. Referring to FIG. 8, reference time, VID from the DEMUX unit 11
An operation when receiving EO data and AUDIO data will be described.

First, the power of the digital TV receiving terminal 10 is turned on, and the DEMUX unit 11 outputs the reference time and VIDEO.
Data and AUDIO data are received (step S8)
1).

Next, the reference time and VIDEO data and AU
The difference information is extracted based on the reproduction time included in the DIO data (step S82).

The difference information is notified to the difference analysis unit 32 (step S83), and the difference upper limit / lower limit values are read from the difference analysis unit 32 (step S84).

Difference information between VIDEO data and AUDIO data and the difference upper limit read from the difference analysis unit 32.
When it is compared with the lower limit value (step S85) and it is determined that it is within the range (step S85 is within the range), the VIDEO data is sent to the VIDEO decoder section 24 and the AUDIO data is sent to the AUDIO decoder section 25 (step S8).
6). On the other hand, if it is determined to be out of the range (step S85 is out of range), the VIDEO data or AUDIO data is discarded, and the process proceeds to step S81.

By the above processing, the reproduction timing adjusting operation is performed, and the optimum upper limit value of the difference is automatically determined to minimize the discarded VIDEO data and AUDIO data, and the VIDEO data and AUDIO data are transmitted together with the reference time including an error. It is possible to smoothly reproduce the created VIDEO data and AUDIO data.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIGS. 9 to 11.

FIG. 9 is a block diagram showing the arrangement of an AV reproduction automatic adjusting apparatus according to the third embodiment.

The AV reproduction automatic adjusting apparatus (TV receiving terminal 10) of the third embodiment is composed of a DEMUX section 11, an AV decoding section 12 and a reproducing section 13, and further includes an AV section.
The decoding unit 12 includes a difference information storage unit 23 and a VIDEO.
The decoder unit 24, the AUDIO decoder 25, the delay memories 26 and 27, the VIDEO output unit 28, and the AUDI
The O output unit 29 and the dynamic difference comparison unit 31 are the same as those in the second embodiment, but in the second embodiment, the difference comparison unit with channel 32 and the channel information storage unit 33 are provided. Is deleted and a timer processing unit 41 and a difference analysis unit with timer 42 are added instead.

The components newly added in the third embodiment will be described.

The timer processing unit 41 has one internal timer and notifies the timer-equipped difference analysis unit 42 when a timeout occurs.

The initial value of this internal timer is determined based on the bit rate information of the MPEG transport stream from the DEMUX unit 11. Since the higher the bit rate is, the more data is received in a certain time, the initial value of the internal timer is inversely proportional to the bit rate.

When the timer processing unit 41 notifies the timer processing unit 41 of the time-out, the timer-equipped difference analysis unit 42 deletes the old difference information stored in the difference information storage unit 23. Further, the difference information notified from the dynamic difference comparison unit 31 is registered in the difference information storage unit 23, and the difference upper limit / lower limit value is calculated based on the plurality of difference information stored in the difference information storage unit 23.

FIG. 10 is a flow chart showing the operation of the timer processing unit 41 in the third embodiment. Figure 10
The timer count processing operation will be described with reference to FIG.

First, when the power of the digital TV receiving terminal 10 is turned on, the timer counter is initialized (step S101).

Next, it is determined whether or not the timer counter is zero (step S102).

If it is determined to be zero (step S1)
02 is zero), the difference analysis unit 42 is notified of the timeout (step S103), and the bit rate information is received from the DEMUX unit 11 (step S104). On the other hand, when it is determined that the value is not zero (step S102 is not zero), the process proceeds to step S102.

Next, the initial value of the timer is calculated from the received bit rate information (step S105).

Finally, the timer counter is set to the timer value, the timer is started (step S106), and the process proceeds to step S102.

FIG. 11 is a flow chart showing the operation of the timer-equipped difference analysis unit 42 in the third embodiment. The calculation operation of the difference upper limit / lower limit values when the difference information is received from the dynamic difference comparison unit 31 will be described with reference to FIG. 11.

First, when the power of the digital TV receiving terminal 10 is turned on, the difference upper limit and lower limit values are initialized (step S111).

Next, it is determined whether or not a time-out notification has been received from the timer processing section 41 (step S11).
2).

If it is determined that there is a timeout notification (there is step S112), the difference information that is older than the difference information storage unit is deleted (step S113). On the other hand, when it is determined that there is no timeout notification (No in step S112), the process proceeds to step S114.

Next, the difference information notified from the dynamic difference comparison unit 31 is received (step S114), and it is determined whether or not the number of samples of the received difference information has reached the determined amount (step S115). .

When it is determined that the number of decisions is reached (the number of decisions is reached in step S115), the average value (step S116), the allowable width (step S117), and the difference upper and lower limit values based on the plurality of sampled difference information. (Step S
118) is calculated.

On the other hand, if it is determined that the time has not been reached (step S1)
15 has not been reached), the process proceeds to step S112.

Finally, the difference upper limit
The lower limit value is updated (step S119), and step S
Transition to 112.

By the above processing, the reproduction timing adjustment operation is performed, and the optimum upper limit value of the difference is automatically determined to minimize the discarded VIDEO data and AUDIO data, and the VIDEO data and AUDIO data are transmitted together with the reference time including an error. It is possible to smoothly reproduce the created VIDEO data and AUDIO data.

Although some embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the technical contents of the above embodiments. That is, the following is also included in the present invention.

First, in the first and second embodiments, the difference upper limit and lower limit values are calculated using a fixed number of samples, but analysis may be performed using data sampled within a fixed time. , But not limited to this.

Further, although the difference upper limit and lower limit values are calculated using the average value and the allowable width, it is obvious that the difference is not limited to this.

[0101]

According to the automatic reproduction adjustment device of the first aspect, even if there is an error between the reproduction time and the reference time of the MPEG data received as a digital TV broadcast, the analysis and control are automatically performed in the device. VIDE to be destroyed by
It is possible to provide a digital TV receiving terminal that can minimize O data and AUDIO data and that can smoothly reproduce images and sounds.

According to the reproduction automatic adjusting device of the second aspect, the same effect as that of the first aspect can be obtained.

According to the automatic reproduction adjusting device of the third aspect, the same effect as that of the second aspect can be obtained.

According to the automatic reproduction adjusting device of the fourth aspect, the same effect as that of the first aspect can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an AV reproduction automatic adjustment device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a data configuration of difference management information stored in a difference information storage unit according to the present invention.

FIG. 3 is a flowchart showing a specific procedure of a difference analysis unit according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a specific procedure of a difference comparison unit in the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an AV reproduction automatic adjustment device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing an example of a data configuration stored in a channel-equipped difference information storage unit (a) and a channel information storage unit (b) according to the present invention.

FIG. 7 is a flowchart showing a specific procedure of a difference analysis unit with a channel according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing a specific procedure of a dynamic difference comparison unit according to the second embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of an AV reproduction automatic adjustment device according to a third embodiment of the present invention.

FIG. 10 is a flowchart showing a specific procedure of a timer processing unit according to the third embodiment of the present invention.

FIG. 11 is a flowchart showing a specific procedure of a difference analysis unit with a timer according to the third embodiment of the present invention.

12A is a distribution status of difference information in the difference information analysis unit of the present invention, FIG. 12B is a Video distribution analysis chart, and FIG. 12C is an Audio distribution analysis chart.

[Explanation of symbols]

10 Digital TV receiving terminal 11 DEMUX section 12 AV decoding section 13 Playback section 21 Difference Comparison Unit 22 Difference analysis unit 23 Difference Information Storage Unit 24 VIDEO decoder 25 AUDIO decoder 26 delay memory 27 delay memory 28 VIDEO output section 29 AUDIO output section 31 Dynamic Difference Comparison Unit Difference analysis unit with 32 channels 33 channel information storage 41 Timer processing unit 42 Difference analysis unit with timer

Claims (4)

[Claims] 1. A reproduction automatic adjustment device for receiving information data having reproduction time information to be transmitted and performing reproduction processing, wherein difference information calculated based on the reproduction time included in the received information data is used. Difference information storage means for storing, difference analysis means for analyzing the distribution status by referring to the difference information stored in the difference information storage means, and calculating difference upper and lower limit values optimal for difference comparison, An automatic reproduction adjustment device, comprising: a difference comparison unit that adjusts the reproduction timing based on the difference upper limit and lower limit values calculated by the difference analysis unit. 2. Further, a channel information storage means for storing channel information indicating a reception state of each channel is provided, the difference information storage means stores difference information for each channel, and the difference analysis means is for the channel information. By referring to the channel management information stored in the storage means, the difference information of the specific channel stored in the difference information storage means is determined to be overwritten, and the difference information of the new channel is registered. The upper limit and the lower limit of the difference are determined according to claim 1.
The automatic reproduction adjustment device described. 3. The reproduction automatic adjustment device according to claim 2, wherein the channel management information is a set of a cumulative reception time and a reception count. 4. Further comprising timer processing means for determining a timer value for holding and managing the difference information based on the bit rate information, and the difference analysis means according to the timer value decided by the timer processing means. The automatic reproduction adjustment device according to claim 1, wherein unnecessary difference information is deleted from the difference information stored in the storage means.