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AssigneeYamaha Corporation
InventorJun Ishii
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A user is fingering a piece of music on an electronic piano in ensemble with the playback of a piece of music recorded in a compact disc; while the user is playing the piece of music, the electronic piano generates MIDI music data codes representative of the fingering, and the MIDI data bits and the audio data codes, which are transmitted from the compact disc player, are multiplexed into a digital composite music data signal; the digital composite music data signal is transmitted through a single digital audio cable to a tone generator module or stored in a memory, and the tone generator module demultiplexes or extracts the MIDI music data codes from the digital composite music data signal; thus, the multiplexing and demultiplexing make the data transmission and recording simple.
A multiplexing system for producing a digital composite music data signal from first music data codes formatted in accordance with a first standard and second music data codes formatted in accordance with a second standard different from said first standard, comprising:
A method for producing a digital composite music data signal from first music data codes formatted in accordance with a first standard and second music data codes formatted in accordance with a second standard different from said first standard, comprising the steps of:
A computer program representing a method for producing a digital composite music data signal from first music data codes formatted in accordance with a first standard and second music data codes formatted in accordance with a second standard different from said first standard, said method comprising the steps of:
An information storage medium for storing a computer program representing a method for producing a digital composite music data signal from first music data codes formatted in accordance with a first standard and second music data codes formatted in accordance with a second standard different from said first standard, said method comprising the steps of:
A demultiplexing system for separating at least first music data codes formatted in accordance with a first standard from a digital composite music data signal containing said first music data codes and second music data codes formatted in accordance with a second standard different from said first standard, comprising:
A method for separating at least first music data codes formatted in accordance with a first standard from a digital composite music data signal containing said first music data codes and second music data codes formatted in accordance with a second standard different from said first standard, comprising:
A computer program representing a method for separating at least first music data codes formatted in accordance with a first standard from a digital composite music data signal containing said first music data codes and second music data codes formatted in accordance with a second standard different from said first standard, said method comprising:
An information storage medium for storing a computer program representing a method for separating at least first music data codes formatted in accordance with a first standard from a digital composite music data signal containing said first music data codes and second music data codes formatted in accordance with a second standard different from said first standard, said method comprising:
Dependencies are inferred from the claim text.
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Transmission between separate instruments or between individual components of a musical system: using a MIDI interface
Files or data streams containing coded musical information, e.g. for transmission: file merging MIDI, i.e. merging or mixing a MIDI-like file or…
Electrophonic musical instruments
Term end not estimated
This invention relates to digital signal superimposing technologies and, more particularly, to a multiplexing system for digital signals formatted on the basis of different standards, a method used therein, a demultiplexing system for separating the digital signal from the other digital signal and a method used therein, computer programs for those methods and information storage media for storing the computer programs.
There are several standard books describing different ways to express pieces of music. One of the standard books is called as “MIDI (Musical Instrument Digital Interface) standards”, and the MIDI standards are popular among musicians who play electronic musical instruments. Music data represented in accordance with the MIDI standards is referred to as “MIDI music data codes”. Event codes and delta-time codes are the major part of a set of MIDI music data codes. A note-on event and a note-off event are typical examples of the event code. A tone is generated at the note-on event, and the tone is decayed at the note-off event. The delta-time code is representative of a time period between an event and the next event. The MIDI music data code or codes contain a piece of information, and the information written in the MIDI data code or codes is hereinafter referred to as “MIDI data”.
Another standard book is called as “Red Book”, which are popular among the audio fans. A music passage is represented by a series of discrete binary values on an analog audio signal, and CDs (Compact-Disc) are used for recording pieces of music in the form of discrete binary values. A series of discrete binary values representative of a music passage is hereinafter referred to as “audio music data codes”. The audio music data codes form a set of “audio data code” together with several sorts of control data codes. One of the sorts of control data codes is representative of a lapse of time from initiation of a performance, and is hereinafter referred to as “audio time data codes”. The audio music data code contains a piece of information, and the information written in the audio music data code is hereinafter referred to as “audio data”.
The features and advantages of the multiplexing system, method used therein, demultiplexing system and method used therein, computer programs and information storage media will be more clearly understood from the following description taken in conjunction with the accompanying drawings, in which
FIG. 1 is a block diagram showing the system configuration of an electronic musical instrument according to the present invention,
FIG. 2 is a block diagram showing the system configuration of a controller incorporated in the electronic musical instrument,
Electronic Musical Instrument
Referring first to FIG. 1 of the drawings, an electronic musical instrument embodying the present invention largely comprises a music data source 11, a tone generator module 12 a sound system 16, a digital audio cable 17 and analog audio cables 18. The music data source 11 is connected through the digital audio cable 17 to the tone generator module 12, and the tone generator module 12 is connected to the sound system 16 through the analog audio cables 18. The music data source 11 multiplexes MIDI music data codes and the audio data codes in a digital modulated music data signal, and supplies the digital modulated music data signal through the digital audio cable 17 to the tone generator module 12. The tone generator demultiplexes the MIDI music data codes and audio data codes from the digital modulated music data signal, and converts the MIDI music data codes and audio data codes to analog audio signals. The tone generator module 12 supplies the analog audio signals to the sound system 16 through the analog audio cables 18. The sound system 16 amplifies the analog audio signals from a line level to a speaker level, and converts the analog audio signals to electronic tones and electric tones.
In this instance, the music data source 11 includes a compact disc player 11a, a keyboard 11b and a data processing system 11c. Compact discs are selectively loaded into the compact disc player 11a, and the audio data codes are read out from the compact disc. The audio data codes are supplied to the data processing system 11c. On the other hand, while a user is fingering a music passage on the keyboard 11b, event codes representative of the note-on events and note-off events are generated, and are supplied from the keyboard 11b to the data processing system 11c together with the delta-time codes. The data processing system 11c multiplexes the MIDI music data codes and audio data codes into the digital modulated music data signal, and supplies the digital modulated music data signal through the digital audio cable 17 to the tone generator module 12.