JP2000324171A - Device and method for data transfer and method for data distribution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transfer device and a data transfer method in which game proceedings are never prevented even when the data transfer speed of a digital circuit and the quantity of data to be transferred fluctuate. SOLUTION: A CPU 24 reduces the data quantity of voice data by a prescribed method. A communication module 26 monitors the transfer speed of a digital line 300 all the time and detects the transfer speed. The whole voice data are transferred in real time while there is sufficient margin in the transfer speed. However, in the case the module 26 detects that the whole data can not be transferred in real time, the purport is notified the CPU 24. When the CPU 24 receives this signal from the module 26, it executes processing reducing data quantity and sends the voice data whose data quantity is reduced together with information to the effect that the data quantity is reduced to the module 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device and a data transfer method suitable for, for example, transferring game contents data by connecting a plurality of game machines via a line, and a digital data distribution method.

[0002]

2. Description of the Related Art The functions of home-use game machines and arcade game machines installed in so-called game arcades have been dramatically improved. Has been realized. Furthermore, in recent years, a competitive game in which a plurality of game machines are connected and a player operating each game machine competes in a martial arts or sports game on a screen of the game machine has been realized.

[0003]

[0005] In the case of conventional competitive game machines, the information exchanged between the game machines connected via a line is mainly the operation information of the game machine, which was sufficient until now. . However, as the functions of the game machines further improve in the future and the content of the games becomes more sophisticated, image data and audio data will be transferred between the game machines in real time, or they will be at a distance It is anticipated that a function such as interaction between players will be required.

When game machines are connected to each other via a digital line, it is not always possible to use a digital line having a sufficient data transfer rate due to cost and functional limitations. In such a situation, if the amount of data to be transferred temporarily increases for some reason, data transfer is delayed. Also, when transferring data between game machines using an existing public line, the transfer speed of the public line may fluctuate according to the situation at each time. It is conceivable that the transfer speed of the public line may be temporarily reduced while the data is being transmitted, and the data transfer may be delayed.

[0005] However, especially in the case of a competitive game machine, real-time performance is important, and if the transfer of data is delayed due to the above reasons, the progress of the game is hindered.
It is also conceivable that the fun of the game is reduced or the game itself is not feasible.

[0006] The background of the present invention has the above technical problems. That is, an object of the present invention is to provide a data transfer device and a data transfer method that do not hinder the progress of a game even if the data transfer speed of a digital line or the amount of data to be transferred fluctuates.

[0007]

In order to achieve the above-mentioned object, the present invention relates to a method in which a transmitting side and a receiving side are connected by a digital line, and voice data is transferred from the transmitting side to the receiving side via the digital line. A transfer rate monitoring means for monitoring a transfer rate of the digital line, and a data transmission apparatus for receiving a signal from the transfer rate monitoring means and transferring the voice data according to the transfer rate. Data amount control means for changing the amount, and a data processing means on the receiving side for performing predetermined processing on the transferred audio data based on the control content of the data amount control means. I do.

[0008] To achieve the above object, the present invention provides:
In a data transfer method for connecting a transmitting side and a receiving side by a digital line and transferring voice data from the transmitting side to the receiving side via the digital line, a transfer speed monitoring step of monitoring a transfer speed of the digital line. A data amount control step of receiving a signal from the transfer rate monitoring unit and changing an amount of data to be transferred in accordance with the transfer rate; and And a data processing step of performing a predetermined process.

Furthermore, the digital data distribution method of the present invention combines primary distribution for distributing digital data obtained by deteriorating original digital data, and means for restoring original digital data from the degraded digital data. And secondary distribution to be distributed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] Before describing the configuration and transfer method of the apparatus according to the present embodiment, first, how real-time data transfer is important in a game machine will be described. FIG. 1 shows how this audio data is expressed when a player playing at one of two (or more) game machines connected by a digital line says "Hello". FIG. 4 is a schematic diagram showing whether or not transfer is possible.

Here, in order to simplify the story, FIG.
2 seconds for the player to pronounce “Hello” (1 second for the first half “He”,
It takes 1 second to produce the second half of "llow", and the first half voice and the second half voice are each transferred in one packet. Also, if the number of quantization bits is 16
The bit and sampling frequency are 44.1 kHz (the same as for a compact disc (CD)). In this case, the total data amount to be transmitted in two seconds is about 1400 kbits, and the data amount for one packet is about 700 kbits. Here, if the transfer speed of the digital line is 500
If k bits / sec (= 500 kbps), all data cannot be transferred in real time.

If there is not a sufficient transfer rate to transfer audio data in real time, a phenomenon as shown in FIG. 1B may occur in a game machine that receives and reproduces data. First, when the receiving side is waiting for data to arrive for each packet, the first half of "H
A gap is left between "e" and "llow" in the latter half.
Also, if the data of all the packets is waiting, the start of the first sound is delayed as shown in the figure, and the sound is reproduced on the receiving side after a while after the transmitting side sends the sound. Is done. Alternatively, if only the simple real-time property is emphasized and the data is received and immediately reproduced, a part of the voice is lost as shown in FIG.

[0014] When such a phenomenon occurs, the real-time property is impaired, the sound is interrupted on the way, the sound becomes meaningless, etc. It may happen that the player feels or the game itself does not hold. Therefore, the data transfer device according to the present embodiment can be used even when the data transfer speed is limited and all data cannot be transferred in real time when the real-time property is strongly required like a game device. Priority is given to reproducing audio in real time, and audio data is transferred with the data amount reduced.

If the amount of data is reduced, there is a problem that the sound quality is reduced as a reflection effect. However, when actually playing a game on a game console, there is a case where the priority is given to transferring audio data in real time even if the sound quality is dropped, and a case where the sound quality is maintained even if the real-time and continuity of data transfer is impaired It can be seen from the comparison that the real-time performance of the data transfer has a great effect on the progress of the game, while the deterioration of the sound quality is not so noticeable. This is particularly noticeable in competitive games.

FIG. 2 is a block diagram showing the data transfer device according to the present embodiment collectively for each main function. The game machine 1 on the transmitting side and the game machine 10 on the receiving side are connected by a digital line 7. I have. The sound source 2 may be a voice generated by a player digitized in real time, or may be voice data such as BGM or various sound effects prepared in advance.

The audio data from the sound source 2 is temporarily stored in the storage unit 3. The transfer rate monitoring unit 6 constantly monitors the transfer rate of the digital line 7 via the communication unit 4 and sends the result to the data amount control unit 5. The data amount control unit 5 obtains the amount of data that can be transferred at that time based on the transfer speed of the digital line 7 received from the transfer speed monitoring unit 6, and based on the result, the data of the audio data stored in the storage unit 3. Perform processing to reduce the amount. A specific method of this processing will be described later.

From the storage unit 3, audio data whose data amount has been reduced is read out and sent to the game machine 10 on the receiving side via the digital line 7. Game machine 10 on the receiving side
Is for the audio data received via the communication unit 11,
Based on the content of the data reduction process performed by the data amount control unit 5, a predetermined process is performed so that the data processing unit 12 can reproduce the voice. And this digital data is D
The signal is converted into an analog audio signal by the / A conversion unit 13 and is sent from the speaker 14.

FIG. 3 is a block diagram more specifically showing the data transfer device shown in FIG. In FIG. 3, the left game machine 100 and the right game machine 200 are connected by a digital line 300, and the voice of the player who is playing the battle game on the game machine 100 is changed to the game of the remote opponent. To the device 200 in real time. Although FIG. 3 shows only components necessary for transferring audio data from the game machine 100 to the game machine 200, similar components (some of which can be used for both transmission and reception) are shown. By providing, the game machine 2
Needless to say, the transfer from 00 to the game machine 100 is also possible.

The game machine 100 is provided with a microphone 20 for converting a voice uttered by a player into an audio signal. The analog audio signal output from the microphone 20 is
After being amplified to an appropriate level by the amplifier 21 and unnecessary high-frequency components are removed by the low-pass filter (LPT) 22,
The data is converted into digital data by the A / D converter 23.

The CPU 24 manages general communication and data transfer. The audio data digitized by the A / D converter 23 is read by the CPU 24. The CPU 24 performs a predetermined process as necessary to reduce the data amount of the audio data by a method described later.
In this process, the audio data is temporarily stored in the RAM 25 as necessary. The CPU 24 sends this data to the communication module 26. At this time, first, the data is temporarily stored in a communication buffer (RAM) 27. As soon as a certain amount of data (for example, one packet) is accumulated in the buffer 27, the game machine 200
Transfer to

The communication module 26 constantly monitors the transfer speed (traffic) of the digital line 300 and detects the transfer speed. That is, in addition to the role of the communication unit 4 described above, it also plays the role of the transfer speed monitoring unit 6. When there is sufficient transfer speed, all audio data is transferred in real time. However, when the communication module 26 detects that all data cannot be transferred in real time, it notifies the CPU 24 to that effect. When receiving this signal from the communication module 26, the CPU 24 executes a process for reducing the data amount described later, and sends the audio data with the reduced data amount to the communication module 26 together with information indicating that the data amount has been reduced.

In the game machine 200, the sent audio data is first temporarily stored in a communication buffer (RAM) 31. When a certain amount of data (for example, one packet) is accumulated in the buffer 31, the data is transferred to the communication module 30, and a predetermined process is performed under the control of the CPU 32. First, the communication module 30 determines whether or not the received data has been subjected to a process of reducing the data amount based on predetermined information included in the data. If the data has been reduced in data amount, a predetermined process is performed according to the reduction method so that the data can be reproduced as audio. The data subjected to such processing is sent to the memory 33 by the CPU 32.

When a certain amount of data is stored in the memory 33, the CPU 32 instructs the PCM sound source 34 to emit a voice based on the stored voice data. P
The audio data output from the CM sound source 34 is converted into an analog audio signal by a D / A
After passing through F36, it is supplied to the speaker 37 and played as sound.

Next, a specific method of the data amount reduction processing of the audio data performed by the CPU 24 of FIG. 3 will be described.
In the apparatus shown in FIG. 3, when the transfer speed of the digital line 300 is not sufficient, the C
The PU 24 transfers only a predetermined number of high-order bits of the number of quantization bits in the sampled audio data, and the CPU 32 of the game machine 200 on the receiving side determines the number of digits not transferred for each of the transferred data. Same data as
(E.g., data in which all digits are 0) are added to the lower order to generate audio data having the same quantization bit number as the original. In addition,
Hereinafter, a method of transferring only a predetermined number of higher-order bits of the number of quantization bits is referred to as a “first data amount reduction method”.

Specifically, when the initial quantization bit number is 16
When it is a bit, the audio data actually sent only the upper 8 bits of the audio data. Game machine 200 on the receiving side
Then, the communication module 30 recognizes whether the currently transmitted audio data is 16 bits or 8 bits. If the audio data is 16 bits, it is reproduced as it is. 0 data is added to the lower 8 bits to form 16-bit data. However,
If the game machine 200 on the receiving side has a function that can also reproduce 8-bit audio data, it reproduces the 8-bit data as it is.

When the audio data thus transferred is reproduced, the sound becomes a sound with some noise when heard on the reproducing side. However, if all the data can be transferred in real time by reducing the data amount, the sound is not interrupted or the reproduction is not delayed, and the real-time property is maintained. In the case where the same sound is repeatedly reproduced on the reproducing side instead of the voice uttered by the player, the lower 8 bits of the data may be transferred in the second and subsequent transfers. Accordingly, it is possible to repeatedly reproduce high-quality sound with little noise in the second and subsequent reproductions.

It goes without saying that the number of quantization bits of the audio data to be transferred is not limited to 16 bits. Also, the number of high-order bits of audio data to be actually transferred is not always fixed to 8 bits as in the above example, but is changed in accordance with the transfer speed of the digital line and the transfer speed at that time. The number of upper bits to be transferred may be changed.

As a method of reducing the data amount of audio data, in addition to the above-mentioned "first data amount reducing method", the following "second data amount reducing method" and "third data amount reducing method" Can also be adopted.

The "second data amount reduction method" does not transfer all digital data obtained by sampling an audio signal at a fixed time interval, but instead transfers data once every several samplings. And the data not transferred are discarded. Here, for example, a case where the audio data is transferred once for every two samplings, that is, a case where the sampled audio data is transferred every other one is considered. In this case, assuming that the original sampling frequency is 44.1 kHz, the reproducing side receives the audio data substantially sampled at 22.05 kHz. Therefore, when such data is reproduced on the receiving side, the sound has a feeling that a high frequency part is missing. However, also in this case, if all the data can be transferred in real time as a result of reducing the data amount, there is no interruption in the sound and no delay in the reproduction.

The "third data amount reduction method" is a data amount reduction method in the case where the sound is of a stereo system. If the audio is sampled separately for the left channel audio (L) and the right channel audio (R), the total data amount is twice as large as when only one of them is used. When it becomes impossible to transfer such data in real time, data obtained by digitally adding data sampled at the same time of both channels is transferred as audio data at each time. If necessary, the level of the added data may be halved or multiplied by a predetermined constant. Hereinafter, the data thus obtained is collectively referred to as “addition data”. By doing so, the sound played back on the playback side will be monaural, but the data amount will be halved, so if all data can be transferred in real time as a result of reducing the data amount,
There will be no interruptions or delays in playback.

In the "third data amount reduction method", transfer may be performed by obtaining additional data only when the transfer speed of the line is reduced. L channel and R obtained separately from addition data
The difference data of the channel may be transferred.
By doing so, it is possible to return to the L-channel data and the R-channel data from the added data and the difference data by a simple operation on the receiving side, and in the case of a normal transfer speed, the data is reproduced as stereo sound. You. In addition, there is an advantage that the same process is always performed on the transmitting side irrespective of the change of the transfer speed except for switching the data to be transferred.

As described above, when audio data is transferred using any of the first to third audio data reduction methods,
Even if the transfer speed is reduced to such an extent that all the audio data cannot be transferred, the possibility that inconveniences such as interruption of the audio on the way or delay of the start of the audio data are reduced, and the audio can be transmitted to the other party in real time. At this time, the sound quality is slightly reduced, such as noise mixing, lack of high frequency, stereo sound becomes monaural sound, but in the case of game machines, players are seriously focusing on the contents of the game, so Such a decrease in sound quality is not so noticeable to the player. In the case where the sound transferred on the playback side is repeatedly played back, it is possible to have the remaining data transferred in the second and subsequent transfers. In that case, it is possible to repeat the second and subsequent times. Sometimes it is played back as the original complete sound.

Next, the communication module 26 of FIG.
A method of detecting the transfer speed of a digital line will be described. As described above, the voice data transfer apparatus shown in FIG. 3 uses the transfer rate of the digital line 300 or the amount of data to be transferred in accordance with a change in the capacity of the digital line 300 that can be used for transmitting voice data. Therefore, it is necessary to constantly monitor the transfer speed of the communication line.

In the voice data transfer device of this embodiment, C
A method in which the PU 24 receives information on the data amount from the communication module 26 (hereinafter, referred to as a “first transfer rate monitoring method”) is employed. Since the communication module 26 has the same function as an exchange in general communication, it always keeps track of the current transfer speed of the communication line. Therefore, the information on the transfer speed of the communication line is sent from here to the CPU.
24, and determines whether to reduce the data amount based on the information.

However, the first transfer rate monitoring method can be adopted because a dedicated digital line 300 is laid between the game machine 100 and the game machine 200, and an existing public line is used. If you can not adopt this method. When a public line is used as the digital line 300, the following method ("second transfer rate monitoring method") is adopted. That is, first, a method of transmitting a predetermined number of packets, and the receiving side seeing how often the data arrives. For example, if the sender decides to send 10 packets of data per second on a trial basis, and actually sends the data, only 5 packets arrive at the receiver per second. Is detected, and it is detected that the transfer speed is reduced. The receiving side replies to that effect to the transmitting side, and the transmitting side determines whether to transfer the audio data as it is or to reduce the data amount before transferring based on the returned data. The transmitting side and the receiving side perform such exchanges periodically to keep track of the transfer rate at all times. Although this method is primitive,
This is very effective when a telecommunications company has to use an existing public line that does not provide a traffic notification service.

When a plurality of game machines are connected to play a competitive game, not only the transfer speed of the digital line fluctuates, but also the amount of data to be transferred may fluctuate. For example, when image data, game operation data, and the like are transferred in addition to audio data, the amount of operation data and image data may temporarily increase according to the progress of the game. . As described above, it is possible to reduce the data amount for audio data by giving priority to real-time performance, but for operation data, even if the data amount increases, all of it must be transferred, and for image data, It is also desirable to transfer all of them.

In such a case, the following method is used.
The data amount of audio data among the data to be transferred is controlled. FIG. 4 is a schematic block diagram for explaining this method, and shows a part of the game machine on the transmitting side. 4, digital data sent from the game machine 40 on the transmission side includes, in addition to the audio data 41, image data 42 and operation data 43 obtained by operating an operation means such as a joystick as shown in FIG. It is.

In the game machine 40 on the transmission side, these data are temporarily stored in a dedicated buffer memory 44 and then transferred to the digital line via the communication module 45. The buffer memory 44 includes a memory area 44a for audio data, a memory area 44b for image data, and a memory area 44c for operation data. Communication module 45
, Like the communication module 26 described above, constantly monitors the transfer speed of the digital line and detects the transfer speed.
The detection data is provided to the select CPU 46. The select CPU 46 selects the data to be transferred by looking at the detected data and the data amount of the data stored in the buffer memory 44.

The select CPU 46 checks the transfer speed and the amount of data in the buffer memory 44, and if it becomes impossible to send all the data in real time, the first to third data amount reduction methods described above. Either of them is used to reduce the data amount of audio data stored in the audio data memory area 44a, and at least in the first transfer, only audio data that can reproduce audio in real time on the reproducing side is transferred.

FIG. 5 is a diagram showing an example of an actual game machine in which the data amount of audio data to be transferred is variable as described above. The game machine in FIG. 5 is an example of a car racing game, and a screen 50 displays a selection screen for a plurality of courses A, B, and C. The player can select a course to play from among them. At a location different from the game machine, a storage unit 51 in which audio data is stored is installed. From the storage unit 51, the game machine displaying the course selection screen 50 is displayed via a digital line. Voice data is transferred. Storage unit 5
1 may be installed in another game machine or a dedicated data storage unit for supplying audio data to a plurality of game machines.

The player sequentially switches the courses of A, B, and C displayed on the screen 50 using an operation lever or the like. On the screen 50, each time the player operates the operation lever once, the selectable courses are sequentially switched, and the currently selected course (although the selection has not yet been determined) is highlighted so that the player can be selected. Inform the person to that effect. At this time, at the same time as the selected course is highlighted, predetermined voice data is transferred from the storage unit 51, and a voice unique to each course is played. For example, characteristic sound effects such as "Zuncha, Zuncha" in the case of Course A, "Statin, Statin" in Course B, and "Parappa, Palapa" in Course C are repeatedly played. While the sound is being played, it can be understood that the selection of the course can be finally determined.

For example, when the player operates the operation lever to select the course A, the sound "ZUNCHA, ZUNCHA" is repeatedly played from that point. At this time, it is assumed that at the time of the first audio reproduction, the transfer speed has decreased to such an extent that all the audio data cannot be transferred. In this case, the audio data is reduced by using any of the first to third data amount reduction methods described above, and first, the data whose data amount is reduced is transferred. For example, if only the upper 8 bits of the 16-bit quantization bits are transferred by the first method and reproduced on the receiving side, the first sound of "Zuncha, Zuncha" has a sound mixed with noise. become. However, if the lower 8 bits are transferred the next time the data is transferred, and the upper 8 bits of the data that have already been transferred are reproduced, the second and subsequent times of the repeated reproduction can be performed. Playback is performed with 16-bit original sound. In such a case,
Even if a little noise is heard in the first playback sound, there is almost no problem in the progress of the game.

At this time, if the reproduction of all the audio data is to be started after the arrival thereof, the start of the first audio is delayed. Such a delay in starting,
This is not preferable for a game machine in which a sense of speed is important. On the other hand, as in the present embodiment, even if the sound quality is slightly deteriorated, if the sound reproduction is started at the same time as the course A is selected, an important sense of speed for the game machine is realized. Can be maintained.

[Second Embodiment] Next, a second embodiment will be described. This embodiment relates to a digital data distribution method. As mentioned above, the digitized audio data can also be transferred partially, so that at the receiving end, although imperfect,
It is possible to reproduce the sound for the time being. Therefore, for example, if a part of the audio data of the digitized music content is distributed, the receiving side can understand the general content of the music content by reproducing it. However, on the other hand, many people feel dissatisfied with incomplete audio due to the characteristics of music content.

In consideration of this point, a new distribution or distribution form of music contents and video contents is proposed. For example, it is assumed that the content to be distributed is music, and the complete data has a quantization bit number of 16 bits and is digitized at the same sampling frequency as a compact disk (CD). For example, the top 8
Distribute only the bits as a sample to consumers in some way, free or at a very low price. This is referred to herein as "primary distribution." As a specific method of the primary distribution, the one recorded on a CD or the like may be sent by mail or the like, or may be actually distributed by hand at a store. Alternatively, it may be distributed online via a digital line such as the Internet.

The consumer reproduces this and listens to it. In this case, if software for playback is required, the software is attached to a sample version of the disk, or if it is distributed online, along with the sample version. The consumer can play back the audio data, but it is incomplete data and unsatisfactory in sound quality. And
If the consumer who listens wants the complete data (full version), he / she will receive the distribution of the remaining lower 8 bits of data for a fee. This is referred to herein as "secondary distribution." As a specific method of the secondary distribution, online distribution is also possible in addition to direct distribution. At this time, if any software is required to combine the previously distributed upper 8-bit data with the newly distributed lower 8-bit data, the software is also distributed.

[0048] In this way, the consumer can purchase the full version in the secondary distribution after knowing the content of the music content to some extent by the primary distribution sample version. You don't have to regret not buying it. In addition, since consumers can purchase with confidence, it is possible to expect an increase in overall sales, and the merits as a distributor are great. In particular, since online sales are possible, it is very suitable for online sales via the Internet, which is expected to have more and more use environments in the future.

In the above, in the primary distribution, the “first data amount reduction method” described in the first embodiment is used. However, besides this, a “second data amount reduction method” for transferring data once every several samplings and a “third data amount reduction method” for distributing stereo sound in monaural form It is also possible to adopt it at the time of primary distribution. In addition, as another method, it is also possible to distribute the noise component artificially on the audio data as a sample version in the primary distribution, and to distribute the data to remove this noise in the secondary distribution full version It is. In this case, if the noise is generated by software based on some mathematical formula,
The amount of data required other than the voice data is extremely small, and it is easy to reproduce the full version data from the sample version data. The first to third data amount reduction methods in the primary distribution and the method of primary distribution with a noise component are all degraded to the original data, in other words, the quality is degraded, They are common in that they are distributed.

Further, the case where the content is music data has been described above, but the same distribution method can be easily applied to digitized image data such as a movie.

[0051]

As described above, according to the present invention,
Data rate control means for monitoring the transfer rate of the digital line by the transfer rate monitoring means and changing the amount of data to be transferred according to the transfer rate based on the result is provided. Even if the data amount is reduced and the quality of the transferred audio data temporarily decreases as a result, the data is transferred in real time, so it is particularly applicable to competitive game machines. In this case, the real-time property, which is important for the progress of the game, is maintained, and the progress of the game is not hindered. Data can be returned.

[Brief description of the drawings]

FIG. 1 When a player playing on one of two (or more) game machines connected by a digital line says “Hello”,
FIG. 4 is a schematic diagram showing how the audio data can be transferred.

FIG. 2 is a block diagram illustrating the data transfer device according to the first embodiment collectively for each main function.

FIG. 3 is a more detailed block diagram of the data transfer device of the first embodiment.

FIG. 4 is a block diagram for explaining a method of reducing audio data when image data and operation data are transferred in addition to audio data.

FIG. 5 is a diagram showing an example of a game machine in which the amount of audio data to be transferred is variable.

[Explanation of symbols]

 1, 10, 40, 100, 200 Game machine 2 Sound source 3 Storage unit 4, 11 Communication unit 5 Data amount control unit 6 Transfer speed monitoring unit 12 Data processing unit 13 D / A conversion unit 23 A / D converter 24, 32 CPU 25 RAM 26, 30 Communication module 27, 31 Communication buffer 33 Memory 34 PCM sound source 37 Speaker 41 Audio data 42 Operation data 43 Image data 44 Communication buffer 46 Select CPU 51 Storage unit 50 Course selection screen

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C001 AA09 BA00 BA07 BC00 BC09 BC10 CA07 CB01 CB08 CC08 5K030 GA13 GA16 HA08 HB01 HC01 JT00 LA03 MB00 9A001 BB04 EE04 EE05 HH15 JJ72 JJ76 KK43 KK45

Claims (9)

[Claims] 1. A data transfer device for connecting a transmitting side and a receiving side by a digital line and transferring voice data from the transmitting side to the receiving side via the digital line, wherein a transfer speed for monitoring a transfer speed of the digital line is provided. Monitoring means, on the transmission side, a data amount control means for receiving a signal from the transfer rate monitoring means and changing the data amount of audio data to be transferred according to the transfer rate; and A data transfer device, comprising: a data processing unit that performs a predetermined process on the transferred audio data based on the control content of the data amount control unit. 2. The data transfer apparatus according to claim 1, wherein said data amount control means transfers the original audio data as digital data having a smaller number of bits than the number of quantization bits at the time of quantization. 3. The data transfer device according to claim 1, wherein the data amount control unit transfers the data as audio data having a sampling frequency lower than a sampling frequency when the original audio data is sampled. 4. The data amount control means according to claim 1, wherein when the audio data is audio data acquired in a stereo system, the added data obtained by digitally adding data sampled at the same time of both channels is obtained. The data transfer device according to claim 1, wherein the data is transferred as audio data at each time. 5. A data transfer method in which a transmitting side and a receiving side are connected by a digital line, and voice data is transferred from the transmitting side to the receiving side via the digital line. A monitoring step; a data amount control step of receiving a signal from the transfer rate monitoring means and changing the amount of data to be transferred in accordance with the transfer rate; and A data processing step of performing a predetermined process on the audio data. 6. The data transfer method according to claim 5, wherein in the data amount control step, the original audio data is transferred as digital data having a smaller number of bits than the number of quantization bits at the time of quantization. 7. The data transfer method according to claim 5, wherein, in the data amount control step, the data is transferred as audio data having a sampling frequency lower than a sampling frequency at which the original data was sampled. 8. In the data amount control step, when the audio data is audio data acquired in a stereo system,
6. The data transfer method according to claim 5, wherein added data obtained by digitally adding data sampled at the same time on both channels is transferred as audio data at each time. 9. A primary distribution for distributing digital data in which the original digital data has been degraded, and a secondary distribution for distributing together means for restoring the original digital data from the degraded digital data. A method for distributing digital data, characterized in that: