Music system for transmitting enciphered music data, music data source and music producer incorporated therein
Channel voice messages representative of a piece of music are enciphered to pieces of enciphered music data, and the pieces of enciphered music data are stored in maker exclusive messages; the maker exclusive messages are loaded into packets, and are transmitted from a server to a client; when the packets arrive at the client, the pieces of enciphered music data are restored to the channel voice messages through a reverse process so that the piece of music is produced by means of electronic musical instruments where the data restoration program has been already loaded.
1. A music system for producing music sound on the basis of pieces of regular music data stored in formats defined in MIDI protocols and expressing channel messages, comprising:
a music data source including an information processor having a first information processing capability and a program memory where a series of instruction codes is stored, said series of instruction codes running on said first information processor so as to realize:
a format changer changing the format of a channel message to a format defined in said MIDI protocols for at least one system message,
a cipher manager enciphering said pieces of regular music data to pieces of enciphered music data, and
a writer memorizing said pieces of enciphered music data in a data field of said format for said at least one system message;
a music producer including a second information processor having an information processing capability and a program memory storing another series of instruction codes, said other series of instruction codes running on said second information processor so as to realize:
a restorer restoring said pieces of enciphered music data in said system message to said pieces of regular music data, and
a sound generator producing said music sound on the basis of said pieces of regular music data; and
a data transporter for transporting said at least one system message from said music data source to said music producer.
2. The music system as set forth in claim 1 , in which said at least one system message is a maker exclusive message.
3. The music system as set forth in claim 2 , in which a piece of status representative of a header, a maker identification code, a device identification code, a parity code and another piece of status representative of a footer are further memorized in said maker exclusive message.
4. The music system as set forth in claim 2 , in which said channel messages have respective pieces of event data and respective pieces of time data each representative of a lapse of time from previous event, and said pieces of time data are encoded to pieces of encoded time data for restricting the number of bits representing the lapse of time.
5. The music system as set forth in claim 1 , in which said music data source includes a packet generator loading said at least one system message into a packet, and said packet generator transmits said packet to said music producer through a communication channel serving as said data transporter.
6. The music system as set forth in claim 5 , in which said music data source further includes a dummy packet generator producing a dummy packet or dummy packets, said dummy packet generator transmits said dummy packet or dummy packets to said music producer through said communication channel while said music data source is standing idle for a long time period after a transmission of the previous packet.