JP2008206172A - Music content file and music content distribution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a music content file and a music content distribution method in which trouble to implement setting for enabling a user to obtain a best stereophonic (three-dimensional) acoustic effect can be eliminated and the best stereophonic (three-dimensional) acoustic effect can be easily obtained at all the time. <P>SOLUTION: The present invention relates to a file structure for music contents including music data for playing out at least a piece of music, including the music data, parameter data for playing the music data under stereophonic acoustics, and a preamble that is an identification information header indicating that the parameter data are contained within the file. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a music content file including music data for reproducing and outputting at least music and a music content distribution method.

  Conventionally, the music content data is provided as digital data in a predetermined format that can be played back by hardware or software at a user terminal that plays back the music content.

  In recent years, with the advancement of three-dimensional (three-dimensional) acoustic technology, a technology that allows a listener to listen to three-dimensional music using at least two speakers has been put into practical use. Attempts have been made to play back three-dimensional sound such as incoming melody with two speakers.

  However, in order to reproduce music such as incoming melody (ringtone), which is music content, with three-dimensional (three-dimensional) sound, the characteristics of the reproduced music and the characteristics of the reproducing device (position of the speaker) For example, in the case of a song such as the above-mentioned ringing melody (ringtone), the ringing melody (ringing ringtone) can be changed quite frequently, When downloading and listening to music content of various other music from the server, it is necessary to change these settings sequentially according to the characteristics of the music and the characteristics of the playback device. Not only is it very troublesome, such as finding and setting the settings that match the incoming melody or music to be played, for example, from within the site to download, If not carried out these settings favorable steric (three-dimensional) sound effect is not be obtained.

  The present invention has been made paying attention to such a problem, and can eliminate the trouble of setting these users to obtain the best three-dimensional (three-dimensional) sound effect, so that the best three-dimensional object can be easily obtained. An object of the present invention is to provide a music content file and a music content distribution method capable of obtaining a (three-dimensional) sound effect.

In order to solve the above-described object, a music content file according to claim 1 of the present invention is a music content file including at least music data for reproducing and outputting a music, and the music data is represented by three-dimensional sound. A reproduction program as a player for reproduction, a signal processing program including a virtual sound source generation program, a channel conversion plug-in program, parameter data for reproducing the music data in stereophonic sound, and the parameter data An identification information header indicating that the file is included in the file.
According to this aspect, since the music content includes the parameter data for reproducing the music data included in the music content with stereophonic sound, the user matches the characteristics of the music data to be reproduced. The trouble of finding and setting the setting contents can be eliminated, and the best three-dimensional (three-dimensional) sound effect can be obtained easily and always.

  Further, in the case where hardware or software for reproducing music content with three-dimensional (three-dimensional) sound is not installed on the playback device side, music data included in the music content is reproduced with three-dimensional (three-dimensional) sound. By including the optimal signal processing program for music content in the music content, the user needs to find the signal processing program that matches the characteristics of the music data to be played, for example, from the site where the music content is downloaded, and download it individually The trouble of these users can be eliminated.

The music content file according to claim 2 of the present invention is the music content file according to claim 1, wherein the parameter data is data corresponding to a model of a mobile phone terminal that reproduces music data in three-dimensional sound, It is characterized in that the data is the same in the same music content.
According to this aspect, since the type of speaker for reproducing music and the position of the speaker are different depending on the model of the mobile phone terminal, these parameter data are managed for each model, and these parameter data correspond to these models. By using the parameter data, it is possible to generate music content that can be used by a plurality of mobile phone terminals from the same music data, and it is not necessary to prepare enormous music content in advance, and storage of such enormous music content Not only can the load in capacity and management be greatly reduced, but also the management of these parameter data itself becomes easy, and a higher-quality three-dimensional (three-dimensional) sound effect can be provided to the user.

According to a third aspect of the present invention, there is provided the music content file according to the first or second aspect, wherein the parameter data is obtained by dividing the music data into a plurality of portions in terms of time, and each portion of the music data. In the present invention, different parameter data for reproducing music data in an optimal stereophonic state is included.
According to this aspect, since the music is reproduced in a stereophonic state that matches the characteristics of each part of the music data, a higher-quality three-dimensional (three-dimensional) sound effect can be provided to the user. .

According to a fourth aspect of the present invention, there is provided a music content distribution method using a server computer connected to a computer network (hereinafter referred to as an open computer network) in which a plurality of computers are connected so that data communication is possible. A music content distribution method for distributing a music content file to a user terminal device connected to a computer, wherein at least music data for reproducing and outputting music and reproduction of the music data in three-dimensional sound Parameter data, an identification information header indicating that the parameter data is included, a reproduction program as a player for reproducing the music data in stereophonic sound, a virtual sound source generation program, and a channel conversion plug-in program Including signal processing pros Characterized by distributing music content file that includes a ram, a.
According to this aspect, since the music content includes the parameter data for reproducing the music data included in the music content with stereophonic sound, the user matches the characteristics of the music data to be reproduced. The trouble of finding and setting the setting contents can be eliminated, and the best three-dimensional (three-dimensional) sound effect can be obtained easily and always.

  Further, in the case where hardware or software for reproducing music content with three-dimensional (three-dimensional) sound is not installed on the playback device side, music data included in the music content is reproduced with three-dimensional (three-dimensional) sound. By including the optimal signal processing program for music content in the music content, the user needs to find the signal processing program that matches the characteristics of the music data to be played, for example, from the site where the music content is downloaded, and download it individually The trouble of these users can be eliminated.

The music content distribution method according to claim 5 of the present invention is the music content distribution method according to claim 4, wherein the server computer responds to a distribution request of music content from a mobile phone terminal which is a user terminal. Accordingly, a music content file including the parameter data corresponding to the model specified from the information that can specify the model of the mobile phone terminal included in the distribution request and including the same music data is generated for the same music content. The generated music content file is distributed.
According to this aspect, since the type of speaker for reproducing music and the position of the speaker are different depending on the model of the mobile phone terminal, these parameter data are managed for each model, and these parameter data correspond to these models. By using the parameter data, it is possible to generate music content that can be used by a plurality of mobile phone terminals from the same music data, and it is not necessary to prepare enormous music content in advance, and storage of such enormous music content Not only can the load in capacity and management be greatly reduced, but also the management of these parameter data itself becomes easy, and a higher-quality three-dimensional (three-dimensional) sound effect can be provided to the user.

The music content distribution method according to claim 6 of the present invention is the music content distribution method according to claim 4 or 5, wherein the parameter data is obtained by dividing the music data into a plurality of portions in time. Each piece of the music data includes different parameter data for reproducing the music data in an optimal stereophonic state.
According to this aspect, since the music is reproduced in a stereophonic state that matches the characteristics of each part of the music data, a higher-quality three-dimensional (three-dimensional) sound effect can be provided to the user. .

  According to the present invention, since the music content includes parameter data for reproducing the music data included in the music content with stereophonic sound, the user matches the characteristics of the music data to be reproduced. The trouble of finding and setting the setting contents can be eliminated, and the best three-dimensional (three-dimensional) sound effect can be obtained easily and always.

  Examples of the present invention will be described below.

  FIG. 1 is a diagram showing a configuration of a music content distribution system (hereinafter abbreviated as a distribution system) of the present embodiment to which the present invention is applied.

  As shown in FIG. 1, the distribution system of the present embodiment is given a model name as model identification information, is connected to the Internet network, and has at least two speakers to perform three-dimensional surround reproduction of music data. The mobile phone terminals 2a, 2b... As the user terminals enabled, and the music data are stored, and the mobile phone terminals 2a, 2b... Operated by the access users a, b. In response to receiving the request, the music data, an execution program for reproducing the music data with a predetermined reproduction effect in the mobile phone terminals 2a, 2b, and the adjustment parameters of the execution program are included. A content file having the file structure of the present invention is generated, and the generated content file is stored in the mobile phone terminal 2a. 2b... Mainly composed of a server computer 1 as a server computer that transmits to 2b.

  The server computer 1 in this embodiment includes a ROM for storing a CPU control program (not shown), processing for receiving a content request from the mobile phone terminals 2a, 2b, etc., music data requested by the content request, and the music data. For the mobile phone terminals 2a, 2b,... To generate a content file in which the execution program and the adjustment parameters of the execution program are mixed, and the content file to the mobile phone terminal 2a, 2b... A CPU (not shown) that executes a processing program for performing various processes such as a process to be transmitted to 2b, a control unit (not shown) that includes a RAM that writes and reads necessary data, and the above-described various processing programs and data. And various databases shown in Figure 2 As shown in FIG. 1, a stored storage unit (not shown), a transmission unit 16 and a reception unit 17 for transmitting / receiving data to / from the mobile phone terminals 2a, 2b... Via the Internet network, and a client in the control unit The client request analyzing unit 15 and the data encoding unit 14 formed by request analysis processing and data encoding processing are configured as a normal server computer capable of relatively high-speed arithmetic processing.

  Further, as shown in FIG. 2, the storage portion of the server computer 1 stores music data that can be played back by the mobile phone terminals 2a, 2b, etc., for example, music data in WAV format such as PCM data, musical notes, etc. A digital content database 11 in which digital content data (digital content A, digital content B,...) Consisting of score data or the like is stored in association with a content ID uniquely assigned to the content, and the digital content database 11 Profile data corresponding to the digital data A, digital content B,..., Which is profile data corresponding to each digital content stored in the mobile phone, and the profile data corresponding to the mobile phone model (model). The terminal A profile, the terminal B profile, and so on correspond to the terminal ID / effect profile database 12 stored for each model (model) name and the profile ID uniquely assigned to each profile, and the corresponding profile ID. And an execution program database 13 storing a player, an effect, and a plug-in specified from the stored profile, and a content request is received based on the data stored in each database. Sometimes, an execution program for reproducing digital content data to which a content ID is assigned with a designated reproduction effect and adjustment parameters of the execution program are specified, and a content file having the file structure of the present invention is formed. Like .

  The mobile phone terminals 2a, 2b,... In this embodiment execute a processing program for executing various processes such as a ROM for storing a CPU control program and the like and a process for reproducing a content file transmitted from the server computer 1. A control unit (not shown) having a CPU, a RAM for writing and reading necessary data, and various processing programs, model names as model identification information of the mobile phone terminals 2a, 2b, etc., as shown in FIG. A digital content data contained in a content file transmitted from the computer 1, an execution program, various information such as parameters, and the like are stored, and a data decoding means 24 formed by a data decoding process performed by the CPU. And server via the Internet network by wireless communication A receiving unit 22 and a transmitting unit 23 for transmitting and receiving data to and from the computer 1, an operating unit (not shown) for receiving operations from the access users a, b..., And speakers 31 and 32 for outputting sound. From the playback unit 25 for playing back the digital content data (music data) stored in the storage unit 21 as a three-dimensional (three-dimensional) sound based on the execution program and parameters and outputting from the speakers 31 and 32 The mobile phone is configured to be capable of reproducing music data with a three-dimensional (three-dimensional) sound using an Internet connection, content file reception, and two speakers.

  Further, as shown in FIG. 7, the data decoding means 24 of the present embodiment includes a signal decoding processing unit for decoding a content file signal received from the server computer 1 received by the receiving unit 22, and the signal decoding processing unit. In the received data decoded in step (b), a preamble detection processing unit for detecting a preamble part serving as identification information indicating that the parameter data in the present invention is included in the file, and when the preamble part is detected, the preamble part is analyzed. And having a preamble analysis / data separation processing unit that separates the digital content unit, the execution program unit, and the parameter unit from the received data including the preamble unit and stores them in the storage unit 21, so that the received data includes the preamble unit. In the case of a content file having the file structure of the present invention including From content files and digital content portion and executing the program unit and the parameter section is adapted to be stored separately.

  Here, the flow in which the content file is generated in the server computer 1 of the present invention will be described with reference to FIG. 3. First, the access user a As shown in FIG. 3, the access user “a” selects a song name of various sound effects to be downloaded.

  By selecting the song name of the various sound effects, the mobile phone terminal 2a includes a content ID corresponding to the selected song name and a profile ID indicating the contents of the various sound effects, and the mobile phone terminal 2a includes a header ID at the head thereof. By transmitting a content request including model information (model name) to the server computer 1, the server computer 1 allows each digital content stored in the digital content database 11 as shown in FIG. The digital content stored in correspondence with the content ID included in the received content request, for example, the digital content A is specified.

  Then, the profile data stored in the terminal / effect profile database 12 is extracted in association with the model name received together with the content ID and the profile ID included in the content request received together with the content ID (see FIG. 3). The player name, effect name, plug-in name, parameter, playback time, and control information included in the extracted profile data are specified.

  Then, a preamble portion including the specified playback time and control information is generated and used as the head (header) of the content file to be transmitted to the mobile phone terminal 2a. In this embodiment, the data format of these preamble parts is a data arrangement that is not actually possible as music data, specifically, as shown in FIG. The music data content file and the content file of the present invention can be identified.

  In addition, the preamble portion includes data corresponding to the specified player name, effect name, and plug-in name, such as player data for player A, effect data for effect B, and plug-in data for plug-in C. Are extracted from the execution program database 13 as execution program parts.

  Further, parameters specified from the profile data, for example, a parameter for terminal B and a parameter for effect A are used as a parameter part, and data of digital content A that is the specified digital content is used as a digital content part as shown in FIG. Generate a content file for the configuration.

  The content file of the present invention generated in this way is distributed to the mobile phone terminal 2a that is the transmission source of the content request. At the time of this distribution, as shown in FIG. 5, since these content files include data of digital content A having a relatively large capacity, music data other than the content management information included in the digital content A constituting the digital content portion. The portion is compressed into data to be compressed information (data), and the other portion is uncompressed information (data), for example, compressed into a packet as a compressed data format by a content distribution compression algorithm (for example, AAC). be delivered. At this time, since the header information determined by the compression algorithm is sent to the head packet, the preamble portion embedded in this portion is transmitted as uncompressed data, and after all the preamble portions are transmitted, The execution program part and the parameter part are sequentially transmitted, and then the digital content part having the preamble detection signal at the head is transmitted as compressed information.

  In this embodiment, the player A is specifically an AAC data reproduction program, the effector B is specifically a virtual sound source generation program B, and the plug-in C is specifically 2ch-5ch. In the conversion plug-in program, the terminal B parameter is specifically a terminal (model A) inverse filter coefficient, and the effect A parameter is specifically a virtual sound source arrangement A filter coefficient. Note that the inverse filter coefficient for the terminal (model A) and the filter coefficient for the virtual sound source arrangement A are subjected to the optimum digital filter coefficient synthesis processing shown in FIG. Used as various required digital filter coefficients and delay constants.

  The content file of the present invention thus generated is distributed to the mobile phone terminal 2a that is the transmission source of the content request, and as described above, the preamble portion is detected by the data decoding means 24. The digital content data A, the execution program (player A data, effect B data, plug-in C data) and parameter data (terminal B parameters and effect A parameters) are separated and stored in the storage unit 21. Each piece of data is stored in association with each other.

  Based on the digital content portion (digital content data A), the execution program portion (player A data, effect B data, plug-in C data) and parameter portion thus stored in the storage portion 21 in this way. Referring to FIG. 8, the flow of reproduction with three-dimensional (three-dimensional) sound will be described. First, digital content is input as stereo data having Lch and Rch data into a 2ch-5ch conversion program that is a plug-in (software). Then, the sL and sR signals and the center signal C, which are surround signals, are generated by adaptive signal processing using the ADF (Adaptive Digital Filter) of FIG. As a result, the plug-in (software) generates a total of 5ch data of C, sL, and sR signals in addition to the input signals L and R by real-time processing, and performs filter processing and delay for appropriate band limitation etc. The digital output is obtained through a delay circuit for adjustment. The 5ch surround data output by the plug-in (software) is continuously processed by the virtual sound source processing software so that the access user a can perceive it as five independent virtual sound sources. The virtual sound source processing software is composed of nine FIR digital filters as shown in FIG. 8, and the digital filter coefficients are converted to be directly used as the digital filter coefficients by the optimum digital filter coefficient synthesis processing shown in FIG. Therefore, it is only necessary to store the corresponding data from the parameter data of FIG. The 2ch output of the virtual sound source processing software is appropriately sized and then played back by the player (software) and listened to by the two speakers 31 and 32 (or the two speakers 31 and 32 of the headphones) indicated by the playback unit. The access user a who has requested the digital content can listen to the received digital content as an optimized surround sound without being restricted by the physical characteristics and dimensions of the mobile phone terminal 2a. can do.

  As described above, according to the present embodiment, since the music content includes the parameter data for reproducing the music data included in the music content with stereophonic sound, the user can select the characteristics of the music data to be reproduced. Therefore, it is possible to eliminate the trouble of finding and setting the setting content that matches the condition, and to always obtain the best three-dimensional (three-dimensional) sound effect easily.

  Further, according to the present embodiment, in the case where hardware or software for reproducing music content with three-dimensional (three-dimensional) sound is not installed on the playback device side, the music data included in the music content is three-dimensional (3 Dimension) By including an optimal signal processing program for audio playback in the music content, the user can find a signal processing program that matches the characteristics of the music data to be played from, for example, a site where the music content is downloaded. Thus, there is no need to download them individually, and the trouble of these users can be eliminated.

  In addition, according to the present embodiment, the type of speaker for reproducing music and the position of the speaker are different depending on the model of the mobile phone terminal. Therefore, these parameter data are managed for each model, and these parameter data are By using parameter data corresponding to the model, it is possible to generate music content that can be used by a plurality of mobile phone terminals from the same music data, and it is not necessary to prepare enormous music content in advance. Not only can the storage capacity and management load of content be greatly reduced, but also the management of these parameter data itself is facilitated, and higher quality three-dimensional (three-dimensional) sound effects can be provided to the user.

  The content in the present invention is information that incorporates a sound field design such as sound effects, spatial development, etc. intended by creators or mixers as producers, as well as musical sounds, and is supplied as a signal sequence.

  The signal processing program is realized as hardware or software. The content is input, and the input is subjected to virtual sound source generation processing and sound effects (compression, reverberation, etc.). An entity realized for the purpose of outputting a signal for driving a playback device (loudspeaker, earphone, etc.), and is supplied as a digital information sequence.

  Also, the parameter is the purpose of adjusting to reflect the acoustic characteristics of the playback device (including electroacoustic characteristics such as playback device characteristics and acoustic characteristics such as acoustic cavities) so that optimal playback is possible, or playback. It is a set of constants introduced for the purpose of determining characteristics such as sound effects of the program.

  It is self-evident that the creator's intention as the creator of the content does not reach the listener accurately if a break occurs in the digital chain (information chain) of these contents, signal processing programs, and parameters. However, in the prior art, this has been given up in a sense, and although there is a contact such as matching the playback format with the playback player and content, for example, optimization for playback environment (playback device characteristics, etc.) In addition, the selection of the optimal virtual sound source generation process for the content has not been performed at all, and furthermore, since the playback program and its characteristics are independent of the content, an advanced effect such as selecting an acoustic effect for each content Playback was not possible. For example, in the reproduction of a musical sound, the first movement uses a program method P-1 and a parameter A to obtain an intended sound effect, and the second movement uses a program method P- to produce a different sound effect. However, according to the present invention, the content, the signal processing program, and the parameters are linked to each other, whereas the concept of time or piecewise optimization of content such as using 2 and parameter B cannot be realized. It is characterized by being embedded in the content itself without the user having to be aware of it, so that not only the above-mentioned more advanced and flexible content playback is possible but also a listener from the content creator. It is possible to optimize a series of digital chains leading to the ears.

  The purpose of the user is to enjoy the contents, and it is usually troublesome to manage the parameters for making the best use of the playback program and its effects, and it is not intended to manage these parameters It is common. On the other hand, in the case of a system capable of selecting (setting) the reproduction status of the stereophonic sound effect, some users may select (set) possible effects depending on the user's preference and knowledge possessed. Even in such a case, since the intention of the creator side is transmitted by the present invention, it is possible to reproduce content with higher flexibility and higher quality.

  Furthermore, for example, in the case of content playback on a mobile phone terminal, the acoustic characteristics of the mobile phone terminal (including electroacoustic characteristics such as playback device characteristics and acoustic characteristics such as acoustic cavities) differ from model to model. When trying to play back high-quality content, even if there is only one original content, digital content data adjusted for each model (for each model to be serviced) is prepared independently. Therefore, a huge amount of storage capacity is required on the server side. However, according to the present invention, when the user downloads the content, the parameter and program optimized for the model are obtained from the model information. Can be encapsulated and transmitted, so only one original content is required.

  Furthermore, even if the user wants to select various effects, it is possible to prepare and encapsulate the effects recommended by the creator of the content and the model characteristics as a set of programs and parameters. Users can select various effects simply by downloading the content they want to hear.

  In recent years, the functions of mobile phone terminals have been diversified and advanced, and as a result, complicated functions have to be realized, and it has become difficult to ship all of them in a complete state. Therefore, the program update function is essential. At that time, when a problem occurs in the program, forcing the user to update only for the purpose of eliminating the problem is a waste of cost (packet cost, etc.) and time from the user side. According to the file structure of the present invention, the program can be updated without any special user effort. This brings about a great advantage not only for the user side but also for the program development side that the development can be performed on the premise that the program can be concentrated on the framework for operating the program or the program is constantly evolved.

  Further, according to the file structure of the present invention, in the case of a processing system (for example, an effector in a studio, etc.) in which a signal processing program is implemented in software, for example, a stand-alone operation having a digital input, the program is updated. In addition, there is no need to bother to connect a computer to the system. This is because the program can be updated not only via a computer, but also using acoustic data input means. For example, a program CD can be updated by preparing a music CD or the like for program update and then performing normal music playback. This is because the content according to the present invention and the program to be updated need only be encapsulated and reproduced as a music CD, so that no special program updating PC or communication means is required.

  Further, according to the present invention, it is possible to extend the programs and parameters required for the content so that they can be started even from the passage of the content. For this reason, it is possible to link and update the effects and optimum parameters over time. As in the prior art, this content can be produced using a new time axis concept that is not fixed and uniform, such as using this playback program.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, as shown in FIG. 3 and FIG. 4A, the configuration of the content file to be distributed is composed of four parts: a preamble part, an execution program part, a parameter part, and a digital content part. The present invention is not limited to this. For example, the mobile phone terminals 2a, 2b... That are user terminals to which content files are distributed are reproduced in advance by AAC data serving as the player A included in these execution program units. If the program, the virtual sound source generation program that becomes the effector B, the 2ch-5ch conversion plug-in program that becomes the plug-in C, etc. are already installed in software or hardware, these execution program parts are not included. It may be a content file.

  Furthermore, for example, when it is desired to reproduce content with different effects characterized by effects A or B in terms of time or section, a plurality of parameter portions are included as shown in FIG. In addition, playback is performed with two effects of effect A and effect D. In the playback of effect D, when an execution program using effector B and plug-in D different from effect A is optimal, As shown in FIG. 4C, a configuration including a plurality of execution program parts and parameter parts may be adopted.

It is a figure which shows the structure of the music content delivery system in the Example of this invention. It is a figure which shows the structure of each database in the Example of this invention. It is a figure which shows the flow in which the content file is produced | generated in the server computer 1 of the Example of this invention. (A) is a figure which shows the structure of the content file in this invention, (b), (c) is a figure which shows the structure of the content file of another form. It is a figure which shows the flow by which the content file is delivered in the server computer 1 of the Example of this invention. It is a figure which shows the preamble part used for this invention. FIG. 3 is a functional block diagram showing a configuration of data code means 24 in the mobile phone terminal used in the present invention. It is a figure which shows the process condition for implement | achieving the three-dimensional (three-dimensional) sound in the mobile telephone terminal used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Server computer 2a, 2b ... Mobile telephone terminal 11 ... Digital content database 12 ... Terminal and effect profile database 13 ... Execution program database 14 ... Data encoding means 15 ... Client request means 16 ... Transmission part 17 ... Reception part 21 ... Storage part 22 ... receiving unit 23 ... transmitting unit 24 ... data decoding means 25 ... reproducing unit 31 ... speaker 32 ... speaker

Claims (6)

A music content file including at least music data for reproducing and outputting music,
A signal processing program including a reproduction program as a player for reproducing the music data in stereophonic sound, a virtual sound source generation program, and a channel conversion plug-in program;
Parameter data for reproducing the music data in stereophonic sound;
An identification information header indicating that the parameter data is included in the file, and
A music content file characterized by including:   2. The parameter data according to claim 1, wherein the parameter data is data corresponding to a model of a mobile phone terminal that reproduces music data with stereophonic sound, and the music data is the same in the same music content. Music content files.   The parameter data includes different parameter data for dividing the music data into a plurality of portions in time and reproducing the music data in an optimal stereophonic state in each portion of the music data. The music content file according to claim 1 or 2. Using a server computer connected to a computer network (hereinafter referred to as an open computer network) in which a plurality of computers are connected so that data communication is possible, a music content file is sent to a user terminal device connected to the open computer network. A music content distribution method for distribution,
Music data to play and output at least music,
Parameter data for reproducing the music data in stereophonic sound;
An identification information header indicating that the parameter data is included;
A signal processing program including a reproduction program as a player for reproducing the music data in stereophonic sound, a virtual sound source generation program, and a channel conversion plug-in program;
A music content distribution method comprising: distributing a music content file having a structure including:   The server computer, in response to a music content distribution request from a mobile phone terminal that is a user terminal, parameter data corresponding to a model specified from information that can specify a model of the mobile phone terminal included in the distribution request The music content distribution method according to claim 4, further comprising: generating a music content file including the same music data for the same music content, and distributing the generated music content file.   The parameter data includes different parameter data for dividing the music data into a plurality of portions in time and reproducing the music data in an optimal stereophonic state in each portion of the music data. The music content distribution method according to claim 4 or 5.

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