JP2014137590A - Music content distribution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the music programs and cable broadcasting of a television or a radio, Internet music broadcasting and the purchase of CDs as means for listening to various music at present are insufficient for encountering unknown broad musical pieces, listening to the musical pieces with related image information and purchasing favorite musical pieces.SOLUTION: The music content distribution system is configured to respectively distribute music content and related image content (video content or still image content) and data content by independent channels by streaming by using Internet as transmission media, and to set initial channels in a priority order determined under the consideration of service providing configurations, the request of a recipient and line speed conditions, and then to lower the priority order of the respective channels in accordance with the number of loss packets. Thus, it is possible for a user to easily purchase favorite musical pieces from among musical pieces that the user has listened to by using the related data.

Description

  The present invention relates to a method for simultaneously distributing music-based content to a plurality of users by streaming.

  Basically, the potential needs for music are considered large. That's because people love music. However, there are few chances of encountering an unknown song at present. As the background, various factors are conceivable, such as a decrease in the number of music broadcast programs and a limited number of CDs (Compact Discs). On the other hand, a recent trend is that people's preference for music is dispersed. Therefore, for example, music broadcasting by genre is required by many channels. However, it is difficult to provide sufficient programs due to radio wave restrictions in music broadcasting on radio and television.

There are many channels, and cable broadcasting is an example of a music broadcasting service by genre. However, in general, this service is mainly intended for business use as BGM (Back Ground Music) of stores and the like, and since it is a paid service of several thousand yen per month, it is not suitable for general users.
On the other hand, with the spread of the Internet, Internet music broadcasts are rising. Internet music broadcasting has the advantage that it can be globally accessed from anywhere in the world. There are two types of Internet music broadcasting: streaming type / download type and live type / on-demand type. Among them, live Internet music broadcasting by streaming is popular as an effective form because it minimizes the burden on the transmission server. However, such Internet music broadcasting is currently only at the stage of broadcasting of music content, and there are many paid services, which are not enough to enjoy music, and cooperation for purchase of favorite music is possible Insufficient.

Sales of CDs, the main player in the music industry, are declining. It is thought that there are various factors as follows.
1) User preferences are diversified and hit songs are decreasing.
2) Singles are expensive, and albums have few favorite songs.
3) There is no screen (video, still image) when listening to CD on TV.
4) There are few choices for the same song, not only “Song Title” but also “Singer”, “Performer”, “Arrange”.

  On the other hand, Apple's iPod, which is thought to be a competitive product of portable music terminal Walkman, has exploded. Next time, you can purchase your favorite music through the iTunes Store service on the music provider site operated by Apple Inc., and load it on your iPod terminal for enjoyment. In this way, in this service form, you can purchase and enjoy your favorite music, and do not realize encounters with unknown music.

  Based on the above situation, it is desirable to have a service that provides many channels for music broadcasts using the Internet and provides not only music but also sub-contents such as video and still images, and related data content such as metadata and product information. . Thereby, a music service can be developed significantly.

  However, in that case, it is necessary to take into consideration the conditions of the Internet line speed. In fact, the NHK-On-Demand recommends 12 Mbps or more in the VoD (Video-on-Demand) service of typical line speed broadcast programs necessary for various services. Also, the required line speed of Youtube must be 500 kbps or higher. For music, the reproduction speed of MP3, which is a typical signal format, is 128 kbps. On the other hand, the actual line speed is mostly about 1 to several Mbps or less, and there are not many cases where a line speed capable of sufficiently receiving video content is obtained.

  Despite the great music in the world, there aren't enough opportunities to listen to them, and there aren't enough environments to purchase the great music you know. Specific issues are listed below.

  Currently, it is difficult to access a wide range of music content. In particular, there are few opportunities to learn about unknown and wonderful music for free.

  Although some databases related to music are provided, there is no information that can be directly linked to the purchased music. In particular, there is often no option for providing various variations, such as a singer, a performer, and an arrangement sound quality (including the number of channels). There is not enough metadata about the music in broadcasting, cable broadcasting or Internet music broadcasting.

  As a music medium, it is a CD other than music broadcasting. However, since the CD is not attached with an image, the music cannot be fully enjoyed. On the other hand, although music contents by DVD (Digital Versatile Disc) currently exist, both are live concerts. Therefore, general music cannot be enjoyed with images.

  Since music broadcasting uses limited radio wave resources, it is difficult to set a sufficient music channel, and reception is possible only in a specific area where radio waves can be received. On the other hand, cable broadcasting has many channels, but the subject is for business use and is charged, and can only be received in specific areas.

  From the above, music broadcasting using the Internet can set many music channels and can transmit and receive in almost all regions of the world. However, in order to cope with a wide range of users such as FTTH (Fiber-To-The-Home) and mobile terminals, it is often insufficient for bandwidth, and it is difficult to distribute large-band content such as TV (TeleVision) video. .

As a method for solving the above problems and distributing music of a wide variety of genres, an Internet broadcasting service by streaming is conceivable. In addition to music content, which is the main content, image content such as video content and still image content related to data content such as lyrics, metadata, and product information is distributed as sub-contents, greatly enhancing serviceability. Can be improved.
In other words, when listening to music, not only listening to music with your ears, you can not only raise the atmosphere by watching images such as environment images and live images, and still images such as environment images and live images with your eyes. It is possible to know related information such as a song name, lyrics, a singer, and a performer.
In addition, in order to be able to obtain various information necessary for purchasing a favorite song after viewing, it is possible to purchase high-quality song content using the information.

  As a distribution broadcast of various contents related to music as described above, a distribution form unique to each channel is achieved by distributing the music content, the data content, and the image content in a streaming form using independent channels. (Real-time type, non-real-time type), quality-compatible variations, digital rights management DRM (Digital Rights Management), and music content distribution system with priority set to content to cope with insufficient line speed It is what we propose.

Priorities are set in the order of channels corresponding to music contents, data contents, and image contents, respectively. In addition, priority is given to image contents in the order of video contents and still image contents, and the contents are distributed in accordance with the priorities.
In addition, for music content and image content, a plurality of options are prepared regarding sound quality and image size, priority is set for each, and content is selected and distributed in order of priority.

  In consideration of the priority of independent distribution channels corresponding to various signals, the distribution of each channel and channel options is controlled in response to fluctuations in the line speed.

  In the case of live concert distribution, the main content is not only music but also live video, regardless of whether it is relayed or relay-recorded. Therefore, in this case, both music content and video content are the most important content with the highest priority. This means that it is handled in the same way as general video content.

  With the above mechanism, it is possible to realize a system that simultaneously distributes music-based content to a plurality of users as effective content under realistic conditions taking serviceability and network capability into consideration.

According to the present invention, a user can enjoy contents such as music of a wide range of genres and can easily purchase favorite music contents.
As a result, it is currently expected to develop a poor music industry.

FIG. 4 is a diagram showing a channel configuration of a music broadcasting service including music content and related content Is a diagram showing the attributes of each channel Indicates channel priority (general theory) Shows channel priority example (free service) Shows channel priority example (paid service) Is a block diagram showing a transmission server Is a diagram showing the timing of the transmission signal Is a block diagram showing a receiving module Is a flowchart showing the priority control algorithm Is a conceptual diagram showing the form of service provision

  For music that is basically in high demand, there is a need to increase the opportunities for the general public to touch various music. For this purpose, music broadcasting that has many channels and can provide music of various genres is suitable. A form that specifically realizes this is Internet music broadcasting.

Traditional music broadcasts and CDs simply provide music, but to enjoy the music further, accompanying image information (video information, still image information) is also necessary, and in order to purchase favorite music It is necessary to complete metadata information and necessary product information regarding the music (music piece).
The contents of various contents necessary for music broadcasting for improving serviceability are collectively shown in FIG. In order to distribute such information, it is necessary to classify the distribution information from the viewpoint of distribution form. That is, it can be classified into real-time (AV (Audio Video) type) content such as music information and video information, and non-real-time type (data type) content such as still image information and various data.
Considering the position of the information to be distributed, it can be classified into main content (music information), sub-content (video information, still image information, lyrics), and related content (metadata, product information).

In the case of actual distribution, it is efficient because the processing for individual users is unnecessary in the streaming distribution form by the UDP / IP (User Datagram Protocol / Internet Protocol) protocol in the form of Internet broadcasting that is simultaneously distributed to a plurality of users. Economical.
On the other hand, all the related contents are digitally multiplexed and distributed on one channel is unique distribution form (real-time type, non-real-time type) for each channel, variation corresponding to quality, digital copyright management It is not effective because it is difficult to flexibly implement DRM and the information type correspondence such as setting for dealing with insufficient line speed of individual receivers. That is, it is effective to distribute different contents through independent channels.

  FIG. 2 shows the attributes of independent channels corresponding to various contents. That is, the attributes of each channel are different depending on the real-time property of various contents, DRM (copyability at the receiving terminal), audio / image parameters (sound quality, screen size), and the like.

In addition to the attributes of each channel, an important factor is the line speed and playback speed. In the case of content distribution in a streaming form, the line speed is equal to the reproduction speed, so it is important to look at both the line speed and the reproduction speed.
Regarding music, it is necessary to prepare low sound quality, medium sound quality, CD sound quality, and ultra sound quality (broadband sound, increased number of channels, increased number of encoded bits, etc.). A high-quality sound signal similar to a CD requires a high-speed line of about 1.5 Mbps, but Internet music broadcasting does not require such a high quality. For example, music content in MP3 (MPEG Audio Layer-3) format Then, a line speed of about 128 kbps is sufficient.
Also, for image content (video content, still image content), it corresponds to small screen (smartphone etc.), medium screen (ipad etc. tablet terminal) and large screen (TV receiver) according to the size of the receiving terminal display. You need to deliver image content.
Among these, for video signals that require real-time properties, the relationship between the screen size and the playback speed is generally strong. In the case of terrestrial digital broadcasting, a playback speed of 12 Mbps is required if the conditions of HDTV (High Definition TeleVision) are included. On the other hand, in the case of a medium screen size, a playback speed of 2 to 3 Mbps is required. Furthermore, terminals that support the Youtube service receive a lot on a small screen, and a speed of about 500 kbps is a condition on a small-sized screen.

  On the other hand, non-real-time content such as still image content and data content has no inherent transfer / playback speed due to its non-real-time nature. So what are the constraints on speed? That is, the transfer is completed during the transfer time of the music immediately before the corresponding music. The duration of the music is generally about 3 to 4 minutes except for classical music which takes a long time of about 1 hour. Of these, since the data information itself is not large, it is generally unnecessary to consider its capacity. On the other hand, there is generally a sufficiently large amount of information for still image information, and it is necessary to consider the capacity of information corresponding to pixels or compressed by JPEG (Joint Picture Expert Group) or the like. A quantitative description will be given later.

FIG. 3 shows general priorities of such various contents. Due to the nature of Internet music broadcasting, music content 1 is the highest priority, and data content 2 is the next priority. Since the image content (video content or still image content) 3 is a subsidiary content that is not an essential content, it has the third lowest priority. That is, in content distribution mainly composed of music, the priority order of the content that becomes the main subject is higher, and the priority order of the secondary content becomes lower.
In addition, it may be possible to prepare several options corresponding to sound quality and screen size for music content and image content, respectively. That is, one of the quality options for music content 1 is selected, and the highest quality is selected in order of priority. For the image content, either the still image content 3A or the video content B is selected, and the priority order is the order of the video content 3B and the still image content 3A. In addition, options are selected in the order of the large screen, the medium screen, and the small screen for the video content 3A or the still image content 3B in correspondence with the display screen.
That is, the priority order of options in the music content 1 and the image content 3 has higher priority as the information providing richer information or the higher the line speed / playback speed, and the line speed / playback speed with the least information. The lower the priority, the lower the priority.

Regarding the setting or control of the priority order, the aspect differs between the above contents and options. In FIG. 3, the direction of the arrow indicates the direction of control. Dotted arrows indicate the direction of control related to the content, from the lowest priority to the higher priority. In this case, the priority of addition / deletion is indicated. That is, in the content, additional priorities that are deleted from the lower priority are shown. Initially, the content of “music + data + image” is distributed. However, if the line is insufficient, reception of the content of “music + data” is received with the reception of the image content being excluded. In addition, if there is a shortage of lines, only the “music content” content distribution is received.
On the other hand, for the music content and image content options, the solid arrows are from the highest priority to the lowest. That is, a high-quality or large-screen content option with high priority is selected first, and an option with lower priority is selected when the speed is insufficient. In other words, these options are positioned in a selective priority order.

Assuming a specific service, the channel configuration including priority is shown as a specific example.
First, FIG. 4 shows a configuration example of free internet music broadcasting. In this case, by providing a free music service, it is possible to meet wonderful unknown music. Among these, since the music content 11 is free, the minimum necessary sound quality is appropriate, and for example, the MP3 format of 128 kbps is assumed. In addition, with this minimum level, most users will not run out of line speed, and even if copy-prohibited content is copied by illegal means, the product value will be of sufficient quality. The point is not to deserve. Furthermore, since it targets a wide range of users, it is difficult to expect a high-speed and wide-band line, and it is generally difficult to realize a wide-band line for the distribution of video content 13B compatible with a large screen (TV screen). And considering free content, it is hard to expect. On the other hand, with respect to the still image content 13A, since distribution of still image content on a large screen (TV screen) can be realized even on a low-speed line, it is appropriate to prepare this menu.

  Next, FIG. 5 shows an example of a configuration for pay Internet music broadcasting. In this case, it is intended for a user who enjoys a paid music broadcast, for example, at a fixed monthly fee. As a condition for realizing this, a high-speed / broadband line is required. Therefore, in this case, high-quality content is distributed with respect to music content and image content. Accordingly, for the music content 21, CD quality (1.5 Mbps) and ultra sound quality with a wider sound signal or an increased number of encoded bits are prepared, and the video content 23 B is also a large screen (TV screen) video content. Can be considered. However, the still image content 23A is also prepared in consideration of the user's preference range.

The channel control function in the transmission server is simple. That is, music content, image content (video content or still image content), and data content are all transmitted in parallel.
FIG. 6 shows a specific configuration of the transmission server 31. That is, music content, video content, still image content, and data content are selectively read from the music content bank 32, the related video content bank 33, the related still image content bank 34, and the related data content bank 35, respectively, and transmitted respectively. It is transferred to the units 36, 37, 38 and 39, and further distributed to the Internet.
Among these, several quality options are prepared for music and images, and content is transmitted in parallel for each option (quality). Therefore, it is not necessary to consider the conditions of individual recipients.
The content to be transmitted is classified into a real-time type and a non-real-time type according to the characteristics of the information. Real-time content is transmitted through a music channel and a video channel that are synchronized with each other, and a data channel and a still image channel are distributed as non-real-time content. Since the video channel and the still image channel are used for the same purpose, one of the channels is transmitted as the image channel. Therefore, these are in an exclusive relationship in which either one is used.

Next, the synchronization relationship between the contents will be described. In the music broadcasting service, the main content is only music content, and each piece of music is a unit of content. Therefore, music content is a reference for synchronization of various contents for synchronization between contents. FIG. 7 shows the timing of synchronization between various contents to be transmitted, that is, the creation and transmission of AV-type and data-type contents to be transmitted.
That is, since video content is real-time content, it is real-time content like general video content, and needs to be completely synchronized with music content. The video content 43 corresponding to the music is activated by the music start signal (synchronization trigger signal 42) of the music content 41. As a result, a complete synchronization relationship can be maintained for the video content.
On the other hand, the transfer of still image content and data information, which are non-real-time information, must be completed before each piece of music content starts. Therefore, the transfer of the non-real-time content 44 (still image content and data content) corresponding to the next song of the song is started by the synchronization trigger signal 42 of each song, and the transfer is completed within the duration of the song. There is a need to.

As shown in FIG. 8, various information distributed by the three channels of music channel, image channel (video channel or still image channel), and data channel corresponds to the speaker, display, and storage which are the final outputs at the receiving terminal. It is distributed. Typical examples are given for the various configurations.
With respect to music and video, which are real-time information, for the synchronization of music units, all information is synchronized with the music start signal. The synchronization circuit 52 adjusts the time lag between music and video to achieve synchronization.
On the other hand, various signals displayed on the display are synchronized with the synchronization signal 58 of the image frame of the video signal. In this case, when there is no video signal, the synchronizing circuit 51 generates a synchronizing signal 58 of the image frame. Buffer circuits 52 and 54 serve as buffers for the speaker 55 for music signals and the memory 57 for data signals, respectively. The buffer combining circuit BC53 combines various signals and serves as a buffer for the display 56. On the other hand, the channel selection circuit 59A performs the function of channel selection in the receiving terminal. This circuit is determined by the channel initialization signal 59C and the output signal of the packet loss counting circuit 59B that counts the total packet loss of each receiving channel.

The setting of each channel and channel option is performed by a channel selection circuit, and the control algorithm will be described below.
Since the Internet is not a guarantee type that guarantees the line speed but is a best effort type, the line speed varies depending on traffic conditions. Therefore, it is necessary to select a reception channel according to the effective line speed and according to the priority order. Accordingly, by temporarily selecting a certain channel (including parameters) and detecting packet loss within a certain time, it is determined whether or not the channel is selected. That is, if the number of lost packets in a certain time is less than a certain number, it is selected, and if it is more than a certain number, the priority is increased by one and the same operation is performed. Eventually, it falls within a certain number and the channel selection is completed.
Further, even once channel selection is performed, packet loss on the selected channel may increase due to, for example, an increase in traffic on the Internet. In such a case, the channel is shifted to a higher priority channel in the same procedure as described above.

FIG. 9 shows a flowchart of control related to specific channel and channel option priority control and switchback control.
After start 61, initial channel setting 62 is performed based on the service provision form and user's desired conditions. In this state, a loss packet count 63 for all channels within a unit time is performed. As a result, it is compared with a threshold value of a certain number of lost packets which is a service providing condition, and if it is less than that, the state is maintained. If it is equal to or greater than the threshold, the priority order down 64 is performed, and the number of lost packets within a predetermined time is counted again. By repeating such control, it converges to a certain state. As the threshold value, for example, one packet loss can be considered as a typical value within the duration of music of 3 to 4 minutes.

  In a steady state, a decrease in line speed can be detected by an increase in lost packets, in which case the priority can be lowered. On the other hand, the increase in the line speed cannot be detected by the above algorithm. Therefore, a fixed period count 65 is performed, and an initial channel comparison 66 is first performed every fixed period to determine whether or not they are the same. As a result, in the same case, it is not necessary to increase the priority order, so that the steady state is restored. On the other hand, when the comparison results are not the same, that is, when the priority is lowered from the initial channel setting, one priority order increase 67 is performed, and the lost packet count 68 is performed. In this case, if a packet loss of a certain level or more is detected, the original priority order is restored. If no packet loss of a certain level or more is detected, priority order increase 67 is further performed. Such an operation converges to the highest allowable priority level.

There is no real-time restriction for non-real-time content such as still image content and various data contents, but data errors due to packet loss are not acceptable.
In normal data information transfer, data type content that is misreceived by the TCP / IP protocol is reliably transferred by retransmission control. On the other hand, when the UDP / IP streaming protocol for transferring a common signal to a plurality of terminals is used, there is a problem that reliable reception is not guaranteed.
One solution to this problem is to repeatedly transmit the same data content multiple times. In this case, the receiving terminal compares a plurality of the same packets in units of packets, and receives only the packets with no false communication (signal error or packet drop). By this method, it can be received as a packet sequence having no error.

  As an alternative to the above method, a reliable signal is obtained by the TCP / IP protocol only for a packet received in error. This method is advantageous in that the amount of information to be transferred is not doubled or more, but it is necessary to add a server function corresponding to the TCP / VP protocol to the transmission server according to this function.

As the still image as the background image, an image representing the atmosphere of the song or an image of a scene where the song is sung or played is used. In particular, it is necessary to send in advance a still image corresponding to a large screen such as a TV screen within a period of 3 to 4 minutes. There is no problem in the case of a broadband line that can distribute the video content of the TV screen, but this still image transfer time becomes a problem in the case of sending through a lower speed line. The transfer rate when the main content is compressed in the MP3 format is typically 128 kbps. Therefore, it is necessary to assume a similar line speed as a line speed for transferring a still image.
Hereinafter, a typical calculation example is 16 Mb per screen in the HD quality standard, and assuming a low transfer rate of 128 kbps as the transfer rate of the still image transfer channel, the transfer time T is 2 minutes and 40 seconds. Therefore, although the transfer time in this case is within the continuation time (3 to 4 minutes) of the music, the bandwidth compression rate varies depending on the image, and in some cases, the continuation time may be exceeded.

  As can be seen from the above estimation example, when viewing with a TV receiver, it may be difficult to transfer a still image within the music time. In such a case, it is conceivable to display the same still image content for a plurality of music pieces. In this case, the transfer time restriction condition is cleared, but there is a restriction condition that the image needs to be a still image suitable for a plurality of music pieces.

On the other hand, in the case of classical music that lasts for several hours to over an hour, the situation is reversed. In other words, for music that continues for a long time, if the same still image, the situation becomes boring. Thus, it is conceivable to change the background still image at regular intervals or when the tune changes. In this case, it is considered that there is no constraint on the transfer time.
In this case, however, the required memory capacity of the receiving terminal increases.

  In the case of a business model free music broadcasting service based on the CM model, it is necessary to insert CM (Commercial Message) information into the transmitted content. Since music content is always transmitted, it is necessary to insert CM information immediately before or after each song. In addition, during the time when the CM information is transmitted on the music channel, the image content (video content or still image content) needs to be transmitted corresponding to the CM.

The form of the music content distribution system is related to the business model. Business models can be broadly divided into three types: free service linkage models, free CM models, and paid models.
FIG. 10 shows a typical form of providing a service using the music content distribution system of the present invention. That is, a music content distribution service provider receives various music contents and related information from a plurality of music content owner companies, creates data type contents related to AV type contents for each music genre, for example, Send content to the Internet for users.

The free, service-linked model establishes a business based on revenue from linked music content sales services.
As shown in FIG. 10, by linking a music content distribution service and a music content purchase service, a general user who enjoys this service listens to and enjoys the music content distributed, and purchases a favorite piece of music. It is possible to purchase a high-quality music content by making a purchase request to a related music content sales service.

  In the free CM model, a business is established by obtaining income from a CM sponsor, not from a user.

  Currently, paid Internet music broadcasting services are provided in Japan and overseas. A typical service is offered at a flat monthly fee.

  The music distribution system is intended to allow general users to easily access various kinds of music. That is, it provides general users with encounters with a wide range of wonderful music. Thereby, the purchase of the music or the viewing of the singer's concert will be further expanded. As a result, the general user's satisfaction with the music service is greatly improved, and consequently contributes to the development of the music industry.

1 Music content 2 Data content 3 Image content 3A Still image content 3B Video content 11 Music content 12 Data content 13 Image content 13A Still image content 13B Video content 21 Music content 22 Data content 23 Image content 23A Still image content 23B Video content 31 Transmission Server 32 Music content bank 33 Related video content bank 34 Related still image content bank 35 Related data content bank 36 Transmitter (music content)
37 Transmitter (Related video)
38 Transmitter (Related still image)
39 Transmitter (related data)
41 Music signal 42 Synchronization trigger signal 43 Video signal 44 Non-real time type (data type) signal 51 Synchronization circuit 52 Buffer circuit (to speaker)
53 Buffer coupling circuit (vs. display)
54 Buffer circuit (to memory)
55 Speaker 56 Display 57 Memory 58 Synchronization Trigger Signal 59A Channel Selection Circuit 59B Packet Loss Detection Circuit 59C Channel Initial Setting Signal 61 Start 62 Initial Channel Setting 63 Loss Packet Count 64 Priority Down 65 Fixed Period Count 66 Initial Channel Comparison 67 Priority Up 68 Loss Packet Count 71 Music Content Ownership Group 72 Music Content Distribution Service 73 Music Content Sales Service 74 Internet 75 User Group

Claims (10)

In addition to music content, a channel is provided for storing related data content and image content, each channel is prioritized, and distribution is performed in a streaming format according to the UDP / IP protocol corresponding to the priority. Music content distribution method 2. The music content distribution according to claim 1, wherein priority is provided in order of each channel accommodating music content, data content, and image content, and reception is stopped in descending order of priority corresponding to a decrease in line speed. Method 2. The video content and still image content options are provided for the channel that accommodates the image content, the priority is set in the order of the video content and the still image content, and the sound quality and the image content for the music content and the image content, respectively. A music content distribution method characterized by providing a plurality of options regarding size, providing priority in descending order of sound quality and image size, and selecting and distributing content in order of priority In claim 1, in setting the priority order of distribution channels that accommodate various contents, initial channel settings are made according to service provision conditions and receiver's desired conditions, and the total amount of packet loss in each next received channel is detected A music content distribution method characterized in that if the frequency of occurrence exceeds a threshold value, the priority level of each channel and its option is lowered by one, or if it cannot be lowered, reception of that channel is stopped. 2. The channel according to claim 1, wherein, for a channel for which reception has been canceled at a certain period of time, a channel that has recently been canceled or whose priority has been lowered is intentionally revived or received with a higher priority. A music content distribution method characterized in that if the loss is above a certain level, it is restored to its original state, and if no packet loss is detected above a certain level, the reception is restored or the priority level is increased by one. The start information of new music content is used as a trigger signal for the real-time content of music and video and the non-real-time content of still images and data, respectively, for streaming distribution, respectively, according to claim 1. The real-time video content corresponding to the content and the non-real-time content corresponding to the music content next to the music content are read out to synchronize both types of content, and then both types of music content are Music content distribution method characterized by transmitting 2. The non-real-time type content is repeatedly distributed, and the receiving side detects an error in units of packets, and if there is no error, captures it as it is, and if there is an error, replaces it with a subsequent error-free packet To obtain received information without error 2. The music content distribution system according to claim 1, wherein a packet of data content in which an error is detected is downloaded using a TCP / IP protocol. 2. The music content distribution method according to claim 1, wherein the same still image information is used for a plurality of music content units. 2. The music content distribution method according to claim 1, wherein a plurality of pieces of still image information are used for one music content unit.