JP3648829B2 - COMMUNICATION DEVICE AND METHOD, RECORDING DEVICE AND METHOD, AND RECORDING MEDIUM - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication device and method for transferring, for example, variable speed encoded data in which the amount of information per fixed time changes, a recording apparatus and method for recording variable speed encoded data, and variable speed encoding. The present invention relates to a recording medium on which recorded data is recorded.
[0002]
[Prior art]
Conventionally, for example, as shown in FIG. 8, a communication method for transmitting data after setting a transmission band using call setting, for example, a type in which a band such as so-called ATM (Asynchronous Transfer Mode) is declared and secured in advance. In the communication system using this communication network, data transfer is performed according to the procedure shown in FIG.
[0003]
That is, in FIG. 8, the terminal 201 and the terminal 203 are connected by a network (communication network) 202. In the system of FIG. 8, as shown in FIG. 9, first, for example, the terminal 201 performs call setting S1. When call setting S1 is made from the terminal 201, the communication network 202 performs in-network processing S2 and transmits call setting S3 to the terminal 203. When the terminal 203 receives the call setting S3, it returns a call setting acceptance S4 to the communication network 202. Next, when the terminal 203 performs a connection response S5, the communication network 202 returns a connection response confirmation S6, and further performs in-network processing S7 to transmit a connection response S8 to the terminal 201. As a result, the terminal 201 performs the data transfer start S10 after performing the connection response confirmation S9. As described above, in the communication system using the ATM (asynchronous transfer mode) technique shown in FIG. 8, the terminal 201 performs call setting with the terminal 203, and declares the maximum value of the transmission band to the communication network 202. Only the necessary bandwidth is used to increase multiplexing efficiency.
[0004]
[Problems to be solved by the invention]
By the way, in communication using ATM (asynchronous transfer mode) technology as described above, for example, when transmitting variable-speed encoded data, transmission at a variable rate in accordance with the amount of information may be This is desirable for effectively using a limited transmission band.
[0005]
However, in order for the transmission / reception side device to support the variable rate, a complicated function and configuration are required. For this reason, in many cases, transmission is actually performed at a fixed rate. Thus, when a variable rate signal is transmitted at a fixed rate, such as the variable speed encoded data, for example, an invalid packet is stuffed into the variable speed encoded data to obtain a fixed rate. Sending is done.
[0006]
Here, when transmitting the variable-speed encoded data as a fixed rate (fixed rate) as described above, the maximum value of the transmission band to be reported to the communication network (hereinafter referred to as the transmission band peak rate value) is: It is sufficient to take the maximum rate value (hereinafter referred to as the data peak rate value) of the variable speed encoded data.
[0007]
However, a parameter that is set in a variable rate encoder (encoder) that performs variable rate encoding, that is, a call setting parameter that the encoder declares to the communication network is, for example, a value indicating that the entire data has a certain rate value on average. And an upper limit value or a lower limit value of the rate handled by the encoder (that is, a maximum value and a minimum value of the output fluctuation amount of the encoder). In other words, among the call setting parameters set in the variable speed encoder, the value indicating the upper limit value or the lower limit value is a value resulting from the hardware limitation of the encoder itself, and is output by the encoder itself. Is the maximum rate.
[0008]
This will be specifically described with reference to FIG. 10 showing temporal changes in encoder output data. In FIG. 10, it is assumed that the encoder output data fluctuates as indicated by a curve O in the figure, and the output fluctuation amount of the encoder is an amount indicated by W in the figure, and the maximum value of the output fluctuation amount W of the encoder. Is a value indicated by a dotted line Dmax in the figure, and a minimum value is a value indicated by a dotted line Dmin in the figure. The average value of the encoder output data amount is a value indicated by a dotted line A in the figure, and the peak value of the encoder output data O is a value indicated by a dotted line P in the figure. Here, the peak rate value of the actual encoder output data O (the above data peak rate value) varies greatly depending on the nature of the original image or audio encoded by the encoder. The fluctuation amount of the encoder output data O takes a value between the maximum value Dmax and the minimum value Dmin, and is usually not more than the upper limit value (maximum value Dmax) of the call setting parameter set by the encoder. is there.
[0009]
As described above, the maximum value of the transmission band declared from the encoder to the communication network (the transmission band peak rate) is different from the actual peak rate value of the encoder output data (the data peak rate value). It may occur that the peak rate is set higher than the required peak rate (that is, the data peak rate value).
[0010]
Therefore, in the conventional communication system, an extra band is often used more than that actually required for data transmission, and there is a problem that data multiplexing efficiency is deteriorated.
[0011]
Therefore, the present invention has been made in view of such a situation, and a communication apparatus and method capable of effectively using a transmission band and improving data multiplexing efficiency, and variable-speed encoding. An object of the present invention is to provide a recording apparatus and method for recording data, and a recording medium on which variable-speed encoded data is recorded.
[0012]
[Means for Solving the Problems]
The communication apparatus and method of the present invention, when transmitting data in which the amount of information per fixed time changes, transmits after declaring the transmission band using call setting, and the amount of information per fixed time The data is changed, the peak rate value of this data is scanned, the call setup parameter is generated from the obtained peak rate value, the transmission request is generated and declared, and then the transmission request is received and recorded. The above-mentioned problem is solved by outputting the data read from the communication line to the communication line.
[0013]
The recording apparatus and method according to the present invention accumulates the peak rate value and data obtained by scanning each segment of the data when recording data whose information amount per certain time changes. By doing so, the above-mentioned problems are solved.
[0014]
In addition, the recording medium of the present invention records the above-described data by recording the data whose amount of information changes per fixed time and the peak rate value obtained by scanning each segment of the data. Solve the problem.
[0015]
Furthermore, the communication apparatus and method of the present invention sets the transmission band based on the call setting that has been declared when receiving data whose amount of information changes per fixed time, and includes a data peak rate. The above-mentioned problem is solved by receiving a call setting parameter generated from the peak rate value obtained by scanning and setting the transmission band according to the peak rate value of the received call setting parameter.
[0016]
That is, the present invention makes it possible to effectively use a limited band by setting a value obtained by scanning transmission data in advance as a peak rate value to be declared in call setting before transmission.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a configuration example of a communication apparatus including the recording apparatus of the present invention to which the communication method and the recording method of the present invention are applied.
[0019]
The communication apparatus of the configuration example of the present invention shown in FIG. 1 declares a transmission band using call setting and transmits a data by setting a peak rate when transmitting data, for example, so-called ATM (asynchronous transfer), for example. Mode) communication method using technology. The data is, for example, variable-speed compression encoded data in which the amount of information per unit time of original information changes after compression, and the communication apparatus in FIG. 1 transmits the data at a fixed rate. As the variable speed compression coding, for example, compression coding by the so-called MPEG method can be cited as an example. This Moving Picture Image Coding Experts Group (MPEG) is a study organization for video coding for storage, and was established in 1988 under the umbrella of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It is used as an abbreviation for a working group of experts who are considering standardization of compression technology, or as a name for data compression methods such as moving images and audio standardized by this group.
[0020]
Here, the communication apparatus according to the configuration example of the present invention includes a recording apparatus 3 including a recording medium that stores variable-speed encoded data, and a recording medium of the recording apparatus 3 that receives a transmission request from the call setting unit 4. The address notification circuit 1 for informing the position (address on the recording medium) of the data stored in the memory, the address obtained from the address notification circuit 1, and the peak rate of the data stored in the recording device 3 are scanned. The peak scan circuit 2 that stores the peak rate value (data peak rate value), the call setting unit 4 that receives the obtained peak rate value (data peak rate value) and declares call setting parameters, and the recording And an output device 5 that outputs data read from the device 3 from a terminal 6 to a communication line (communication network).
[0021]
That is, in the communication apparatus of the configuration example of the present invention shown in FIG. 1, when the address notification circuit 1 receives a transmission request signal for data to be transmitted from the call setting unit 4, the recording medium provided in the recording apparatus 3 The peak position of the data corresponding to the transmission request signal (address on the recording medium) is notified to the peak scan circuit 2 among the variable speed encoded data stored in the peak scan circuit 2.
[0022]
The peak scan circuit 2 scans the peak rate of the data corresponding to the address among the data accumulated on the recording medium of the recording device 3, and obtains the obtained peak rate value (data peak rate value). save.
[0023]
The call setting unit 4 receives a peak rate value (data peak rate value) stored in the peak scan circuit 2, sets it as one value of a call setting parameter, and is connected via an output device 5 The call setting parameters are reported to
[0024]
The output device 5 outputs the data read from the recording medium of the recording device 3 in response to the transmission request signal to the connected communication network at the rate declared by the call setting unit 4.
[0025]
Therefore, in the communication network, when the transmission rate is set based on the declared call setting parameter when receiving the variable-speed encoded data, the peak rate of the data is obtained by scanning. A transmission band corresponding to the call setting parameter generated from the peak rate value can be set. That is, the maximum value of the transmission band (transmission band peak rate value) reported to the communication network at this time coincides with the peak rate value (data peak rate value) of the data output from the output device 5 to the communication network. ing.
[0026]
As described above, according to the communication apparatus of the configuration example of the present invention, before transmitting requested data, a peak rate value obtained by scanning previously transmitted data is set, and this peak rate value (data Call setting parameters including the peak rate value) are reported to the communication network, and the transmission band peak rate value (transmission band peak rate value) matches the peak rate value (data peak rate value) of the transmitted data. By doing so, a limited transmission band can be used effectively, and the data multiplexing efficiency can be improved.
[0027]
In the above example, the peak rate of the data requested to be transmitted is scanned each time, and the peak rate value is reported as the call setting parameter. For example, it is stored in the recording medium in the recording device 3. For example, the peak rate value (data peak rate value) at the variable speed coding rate of each data is scanned in advance (for example, scanned by the peak scan circuit 2), and each obtained data peak rate value is It is also possible to add to the header or trailer (rear part) of each corresponding data and record it on a recording medium. FIG. 2 shows an example in which the peak rate value of the data is added to the data trailer. That is, in the example of FIG. 2, recording is performed on the recording medium in a recording format in which a peak rate display unit 42 is added as a peak rate value to the data unit 41 and its trailer. When recording is performed on a recording medium in the recording format as shown in FIG. 2, when setting the peak rate value of the data requested to be transmitted, the peak scan circuit 2 in FIG. Based on the address of the data, the trailer of the data is detected from the recording medium of the recording apparatus 3, and the peak rate display unit 42 of the trailer is extracted, and the peak rate value of the peak rate display unit 42 is set as the call setting unit. 4 is output. FIG. 3 shows an example in which the peak rate value of the data is added to the data header. That is, in the example of FIG. 3, recording is performed on the recording medium in a recording format in which a peak rate display unit 51 is added as a peak rate value to the header of the data unit 52. When recording is performed on the recording medium in the recording format as shown in FIG. 3, when setting the peak rate value of the data requested to be transmitted, the peak scan circuit 2 in FIG. Based on the address of the data, the head of the data is detected from the recording medium of the recording device 3, and the peak rate display unit 51 of the head is extracted, and the peak rate value of the peak rate display unit 51 is set as the call setting unit. 4 is output.
[0028]
Further, for example, the peak rate value at the variable speed coding rate of all data stored in the recording medium in the recording device 3 is scanned in advance (for example, scanned by the peak scan circuit 2), and obtained. It is also possible to record each data peak rate value of all the data on a recording medium as a separate file associated with each data. FIG. 4 shows an example of recording each data peak rate value as the separate file. That is, in the example of FIG. 4, each data part 61 is recorded on the recording medium as shown in FIG. 4A, and further, a file different from each data part 61 is shown in FIG. As described above, the data ID 62 indicating the correspondence with the data portion 61 and the peak rate value 63 are recorded on the recording medium. When the peak rate value is recorded on the recording medium as a separate file as shown in FIG. 4, when setting the peak rate value of the data requested to be transmitted, the peak scan circuit 2 in FIG. The data ID 62 of the separate file corresponding to the data is obtained from the address of the data requested to be transmitted, the separate file is detected from the recording medium of the recording device 3 based on the data ID 62, and the detected another file The peak rate value 63 is extracted, and this peak rate value 63 is output to the call setting unit 4. Thus, by scanning each data peak rate value in advance, it is possible to shorten the setup time until the transmission of the data requested to be transmitted.
[0029]
In the example of FIG. 2, FIG. 3, and FIG. 4 described above, the peak rate value of each data already recorded on the recording medium in the recording device 3 is scanned by the peak scan circuit 2, and each peak rate value obtained is obtained. Are recorded on a recording medium, and when each data is input to the recording device 3 from a variable speed encoder (encoder), the peak rate of each data is scanned in advance. It is also possible to record or update the peak rate value together with the recording of each data input from the variable speed encoder as in the examples of FIGS. Also in this case, since each data peak rate value is scanned in advance, it is possible to shorten the setup time until transmission of data requested for transmission is started.
[0030]
By the way, in the above-described example, one peak rate value (data peak rate value) is set for each data. For example, as shown in FIG. Are subdivided as F6,..., Peak rate values are obtained for each subdivided section F1-F6,..., And peak rate values P1-P6,.・ It is also possible to declare each of them. That is, in this case, a plurality of peak values in each section are reported per data. In this way, when one data is transmitted, the transmission is performed while changing the transmission band in each section, and the configuration is similar to a pseudo variable rate transmission.
[0031]
As described above, a communication apparatus that obtains a peak rate value for each section and declares the peak rate value for each section can be realized with the configuration shown in FIG. 6, for example.
[0032]
In FIG. 6, when the address notification circuit 11 receives a transmission request signal for data to be transmitted from the call setting unit 14, the address notification circuit 11 stores the variable speed encoded data stored in the recording medium provided in the recording device 13. Among these, the peak scan circuit 12 is notified of the data position (address on the recording medium) according to the transmission request signal. At this time, the scan interval timer 17 counts the time interval for measuring the peak rate value (that is, the above interval), and when this measurement time interval comes, a timing signal indicating that is sent to the peak scan circuit 12 and the call setting unit 14. Output.
[0033]
The peak scan circuit 12 scans the data corresponding to the address with a peak rate value at every measurement time interval (ie, interval) corresponding to the timing signal, and the current interval (measurement) obtained by the scan. The peak rate value of (time interval) is output to the call setting unit 14. The peak scan circuit 12 clears the peak rate value after outputting the peak rate value of the current section.
[0034]
The call setting unit 14 newly sets the peak rate value of the section from the peak scan circuit 12 as a call setting parameter at the interval at which the timing signal from the scan interval timer 17 is received, and is connected to the output terminal 18. Apply for a call setup parameter in which the peak rate value of the section is set to the communication network.
[0035]
The output device 15 outputs the data read from the recording medium of the recording device 13 in response to the request signal to the connected communication network at a rate for each section declared by the call setting unit 14.
[0036]
That is, the maximum value (transmission band peak rate value) of the transmission band for each of the measurement time intervals (sections) reported to the communication network at this time is for each section of the data output from the output device 15 to the communication network. This corresponds to the peak rate value (data peak rate value).
[0037]
As described above, according to the communication apparatus of the configuration example of FIG. 6, when transmitting the requested data, the maximum peak rate of the data is reported by declaring the peak rate obtained for each segment into which the data is subdivided. Since the peak rate value can be set with a smaller value close to the variable rate encoded data, pseudo variable rate transmission can be performed, and the transmission band can be used more effectively, enabling effective utilization of communication network resources.
[0038]
In the examples of FIGS. 5 and 6 described above, as in FIGS. 2 and 3, for example, the peak rate value of each section of the data stored in the recording medium in the recording device 13, for example, is set in advance. Scanning (for example, scanning with the peak scanning circuit 12), and the obtained peak rate value of each section is added to the header or trailer (rear part) of each corresponding data and recorded on the recording medium. It is also possible. In this way, when the peak rate value of each section is added to the header or trailer of each data, when setting the peak rate value of each section of the data requested to be transmitted, the peak scan circuit of FIG. 12 detects the header or trailer of the data from the recording medium of the recording device 13 based on the address of the data requested to be transmitted, further extracts the peak rate display part of the header or trailer, and this peak rate display part The peak rate value of each section stored in is output to the call setting unit 14.
[0039]
Also in the above-described examples of FIGS. 5 and 6, similarly to the above-described FIG. 4, for example, the peak rate value of each section of all data stored in the recording medium in the recording device 13 is scanned in advance ( For example, the peak scan circuit 12 scans), and the peak rate value of each section of all obtained data can be recorded on the recording medium as a separate file associated with each data. As described above, when the peak rate value for each section is recorded on the recording medium as a separate file, when setting the peak rate value for each section of the data requested to be transmitted, the peak shown in FIG. The scan circuit 12 obtains the data ID of the separate file corresponding to the data from the address of the data requested to be transmitted, detects the separate file from the recording medium of the recording device 13 based on the data ID, The peak rate value of each section of the detected other file is extracted, and the peak rate value of each section is output to the call setting unit 14. As described above, by scanning the peak rate value of each section in advance, it is possible to shorten the setup time until the transmission of data requested for transmission is started.
[0040]
Further, when setting the peak rate value for each section as described above, when each data is input from the variable speed encoder (encoder) to the recording apparatus 13, the peak of each section of each data is previously stored. Scan the rate and record or update the obtained peak rate value of each section together with the recording of each data input from the variable speed encoder as in the examples of FIGS. It is also possible to do so. Also in this case, since the peak rate value of each section is scanned in advance, it is possible to shorten the setup time until the transmission of the data requested to be transmitted.
[0041]
As described above, when the peak rate value of the scan result for each section is written on the recording medium of the recording apparatus 13, each peak in the section (measurement time interval) obtained by the peak scan circuit 12 is used. The rate value is supplied not only to the call setting unit 14 but also to the recording device 13. Therefore, in this case, the recording device 13 performs writing based on the timing signal from the scan interval timer 17.
[0042]
As described above, according to the configuration example of the present invention, the transmission band to be used is transmitted by setting the peak rate value obtained by scanning the transmission data in advance as the call setting parameter to be declared in the call setting before transmission. Therefore, it is possible to set a bandwidth that matches the peak rate value of the data to be transmitted. Therefore, it is possible to effectively use the transmission bandwidth and increase communication efficiency.
[0043]
Furthermore, if the peak rate value obtained for each segment of the data to be transmitted is declared, the peak rate value can be set at a value close to the variable speed encoded data, which makes it possible to make a pseudo variable Speed transmission is possible and communication network resources can be used more effectively.
[0044]
Next, FIG. 7 shows a configuration example of a communication system to which the communication apparatus (including the recording apparatus) of the above-described configuration example of the present invention is applied.
[0045]
In FIG. 7, a communication device (server) 100 according to the configuration example of the present invention includes a call setting unit 104 including the address notification circuits 1 and 11, peak scan circuits 2 and 12, and the call setting units 4 and 14. A recording device control unit 101 that is the recording devices 3 and 13, a recording medium 103, and a network interface unit 102 that is the output devices 5 and 15. The communication device 100 is connected to a plurality of terminals 120 via a network 110 that is the communication network. Each of these terminals 120 displays a network interface unit 121, a decoding unit 122 that decodes the variable-speed encoded data, and the data on the monitor device if the decoded data is displayable data, for example. Display control unit 123.
[0046]
【The invention's effect】
As is clear from the above description, in the present invention, the transmission rate is effectively used by setting a value obtained by scanning transmission data in advance as the peak rate value to be declared in the call setting before transmission. It is possible to improve the data multiplexing efficiency.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing a configuration example of a communication apparatus according to the present invention.
FIG. 2 is a diagram illustrating a recording format when a peak rate value is added to a trailer.
FIG. 3 is a diagram showing a recording format when a peak rate value is added to a header.
FIG. 4 is a diagram used for explaining an example of recording a peak rate value as a separate file.
FIG. 5 is a diagram used for explaining an example in which a peak rate value is set for each section obtained by subdividing data.
FIG. 6 is a block circuit diagram showing a configuration of a communication apparatus when a peak rate value is set for each section obtained by subdividing data.
FIG. 7 is a diagram illustrating an overall configuration of a communication system to which a communication apparatus according to an exemplary configuration of the present invention is applied.
FIG. 8 is a diagram used for explaining the concept of a communication system;
FIG. 9 is a diagram used for explaining the procedure of data communication.
FIG. 10 is a diagram used for explaining a relationship between a peak rate value of conventional data and a peak rate value of a communication network set based on an encoder output fluctuation amount.
[Explanation of symbols]
1,11 address notification circuit, 2,12 peak scan circuit, 3,13 recording device, 4,14 call setting unit, 5,15 output device, 17 scan interval timer

Claims (30)

A communication device that transmits data after declaring a transmission band using call setting when transmitting data whose amount of information changes per fixed time,
Recording means for accumulating data in which the amount of information per certain time changes;
A peak rate scanning means for scanning a peak rate value of data in which the amount of information per certain time changes;
A call setting unit that generates a call setting parameter from the peak rate value scanned by the peak rate scanning unit, generates and declares a transmission request;
Data address information notifying means for notifying the data address information indicating the corresponding data position stored in the recording means in response to the transmission request from the call setting means;
An output means for outputting data read from the recording means to a communication line based on the data address information from the data address information notifying means.   2. The communication apparatus according to claim 1, wherein the peak rate scanning means scans the peak rate value for each section obtained by subdividing data in which the amount of information per certain time changes.   The communication apparatus according to claim 2, wherein the call setting means generates a call setting parameter for each section from the peak rate value for each section, generates a transmission request, and declares it.   3. The communication apparatus according to claim 2, further comprising adding means for adding a peak rate value for each of the scanned sections to a header of corresponding data.   5. The communication apparatus according to claim 4, wherein the recording unit accumulates data in which a peak rate value for each section is added to the header.   3. The communication apparatus according to claim 2, further comprising an adding means for adding a peak rate value for each of the scanned sections to a trailer of the corresponding data.   7. The communication apparatus according to claim 6, wherein the recording unit accumulates data in which a peak rate value for each section is added to the trailer.   3. The communication apparatus according to claim 2, further comprising a file generation unit configured to generate another file in which the peak rate value for each scanned section is associated with corresponding data.   9. The communication apparatus according to claim 8, wherein the recording unit stores the separate file. A communication method for transmitting data after declaring a transmission band using call setting when transmitting data whose amount of information changes per fixed time,
A recording step of storing in the recording means data in which the amount of information per unit time changes;
A peak rate scanning step of scanning a peak rate value of data in which the amount of information per certain time changes;
A call setup step for generating a call setup parameter from the peak rate value scanned in the peak rate scan step, and generating and reporting a transmission request;
A data address information notifying step of notifying the data address information indicating the corresponding data position stored in the recording means in response to the transmission request generated in the call setting step;
An output step of outputting data read from the recording means to a communication line based on the data address information notified in the data address information notification step.   11. The communication method according to claim 10, wherein, in the peak rate scanning step, the peak rate value is scanned for each section obtained by subdividing data in which the amount of information per certain time changes.   12. The communication method according to claim 11, wherein, in the call setting step, a call setting parameter for each section is generated from a peak rate value for each section, and a transmission request is generated and declared.   12. The communication method according to claim 11, further comprising an additional step of adding a peak rate value for each of the scanned sections to a header of corresponding data.   14. The communication method according to claim 13, wherein in the recording step, data in which a peak rate value for each section is added to the header is stored in the recording means.   12. The communication method according to claim 11, further comprising an additional step of adding a peak rate value for each of the scanned sections to a trailer of corresponding data.   16. The communication method according to claim 15, wherein in the recording step, data in which a peak rate value for each section is added to the trailer is accumulated in the recording means.   12. The communication method according to claim 11, further comprising a file generation step of generating another file in which the peak rate value for each scanned section is associated with corresponding data.   18. The communication method according to claim 17, wherein in the recording step, the separate file is stored in the recording means. A recording device for recording data in which the amount of information per fixed time changes,
A peak rate scanning means for scanning a peak rate value of data in which the amount of information per certain time changes;
Have a recording means for storing a scanned the peak rate value by the data and the peak rate scan means the amount of information per the predetermined time is changed,
The recording apparatus according to claim 1, wherein the peak rate scanning means scans the peak rate value for each section obtained by subdividing data in which the amount of information per certain time changes . An adding means for adding the peak rate value for each scanned section to the header of the corresponding data is provided,
20. The recording apparatus according to claim 19 , wherein the recording means accumulates data in which a peak rate value for each section is added to the header. An adding means for adding the peak rate value for each scanned section to the trailer of the corresponding data is provided,
20. The recording apparatus according to claim 19 , wherein the recording means accumulates data in which a peak rate value for each section is added to the trailer. Providing a file generating means for generating another file in which the peak rate value for each scanned section is associated with the corresponding data;
20. The recording apparatus according to claim 19 , wherein the recording unit stores the separate file. A recording method for recording data in which the amount of information per certain time changes,
A peak rate scanning step of scanning a peak rate value of data in which the amount of information per certain time changes;
Have a recording step of storing the said peak rate value scanned by the data and the peak rate scanning process the information amount per the predetermined time is changed in the recording means,
In the peak rate scanning step, the peak rate value is scanned for each section obtained by subdividing data in which the information amount per certain time changes . An additional step of adding a peak rate value for each scanned section to the header of the corresponding data is provided,
The recording method according to claim 23 , wherein in the recording step, data in which a peak rate value for each section is added to the header is stored in the recording means. An additional step of adding a peak rate value for each scanned section to the trailer of the corresponding data is provided,
24. The recording method according to claim 23 , wherein in the recording step, data in which a peak rate value for each section is added to the trailer is accumulated in the recording means. Providing a file generation step for generating another file in which the peak rate value for each scanned section is associated with the corresponding data;
24. The recording method according to claim 23 , wherein said separate file is stored in said recording means in said recording step. It is characterized by recording data in which the amount of information per fixed time changes and a peak rate value obtained by scanning each segment of the data in which the information amount per fixed time changes. recoding media. 28. The recording medium according to claim 27 , wherein data obtained by adding a peak rate value for each section to a header is accumulated. A communication device that sets a transmission band based on a call setting that has been declared when receiving data in which the amount of information per fixed time changes,
Receiving means for receiving a call setting parameter generated from a peak rate value obtained by scanning a peak rate of data in which the amount of information per unit time changes;
And a transmission band setting means for setting a transmission band according to the peak rate value of the received call setting parameter. A communication method for setting a transmission band based on a call setting that has been declared when receiving data in which the amount of information per certain time changes,
A receiving step of receiving a call setting parameter generated from a peak rate value obtained by scanning a peak rate of data in which the amount of information per unit time changes;
And a transmission band setting step of setting a transmission band according to the peak rate value of the received call setting parameter.

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