JP3138585B2 - Electronic tone generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical tone generator and, more particularly, to an electronic musical tone generator capable of receiving performance data transmitted from the outside and performing an event processing such as sound generation or mute while appropriately adding a delay time. .

In recent years, various types of electronic musical instruments have become widespread, and in particular, MIDI (Musical Instrument Digital Inter
An electronic musical instrument that receives performance data transmitted from another musical instrument or an external storage medium via a terminal and plays the musical instrument has been put to practical use.

[0003]

2. Description of the Related Art Generally, such an electronic musical instrument is provided with a musical sound generator for generating a musical sound corresponding to a musical scale. The generated musical tones can be performed not only by performance data directly input from the keyboard attached to the instrument, but also by performance data for automatic performance stored in various storage media or performance data transmitted from the outside. Many are performed.

[0004] Such performance data transmitted from the outside is usually transmitted and received in real time, and is controlled based on the received data so as to generate or mute a musical tone without delay or with a minimum delay time. I was

However, performance data is often not uniform with respect to the time axis, and the transmission path is dense at one time and sparse (empty) at the next moment. . On the other hand, the transmission of performance data from the outside does not necessarily have to be in real time, but may be transmitted in advance and stored on the receiving side.

When trying to transmit everything in real time,
While the transmission path is overcrowded, data to be transmitted may tend to be delayed due to physical limitations, and this cannot be corrected in the prior art.

In such a performance data transmission system according to the prior art, the above-mentioned irrationality occurs despite the fact that the transmission path is not always overcrowded but is often empty during the entire period. Was.

[0008]

SUMMARY OF THE INVENTION According to the present invention, performance data is transmitted in advance using the idle time of a transmission path and stored in a receiving side, and event processing such as generation and mute of a musical tone is sequentially performed at a predetermined time. It is an object of the present invention to provide an electronic musical sound generator having a function of performing the operation.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data receiving means for receiving performance data with a delay time to which a delay time from the reception of performance data to the actual performance is added. Delay means for delaying the performance data with delay time received by the means by a time corresponding to the delay data received at the same time from when the performance data was received; and And a tone generating means for generating or silencing a tone based on the electronic tone generating device.

[0010]

The electronic musical sound generator according to the present invention stores performance data received from outside via a transmission path.

The performance data stored in this manner includes, in addition to the original performance data such as timbre, pitch, and volume,
Based on the data, time data for determining the timing at which event processing such as generation or silence of a musical tone should be executed is also stored.

When a musical tone is generated as an electronic musical tone generator based on performance data stored after reception, the electronic musical tone generator also includes time information indicating at what point in time the execution corresponding to the original performance data should be started. I have.

By adopting such a signal form,
Since data transmission is performed while the transmission path is empty, data transmission efficiency is improved, and performance data is transmitted within a predetermined time.

As a result, it is only necessary to generate a musical tone based on performance data previously received and stored in the electronic musical tone generating apparatus. The generation start time and duration are accurately defined, and a musical tone is always generated based on correct performance data. Guaranteed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be disclosed below with reference to the accompanying drawings showing embodiments. FIG. 1 is a block diagram schematically showing an overall configuration of the electronic musical sound generator as described above.

The electronic musical tone generator shown here relates to the operation of a central processing unit (hereinafter referred to as CPU) 1, a musical tone generating means (hereinafter also referred to as SPU) 2 for generating musical tones under the control of CPU 1, and the operation of CPU 1. A ROM 3 in which programs and data are written, and a random access memory (hereinafter, referred to as RAM) 4 for storing temporary data by the CPU 1 and configuring a register for FIFO and timer. These elements are interconnected by an address bus 5 and a data bus 6.

The performance data receiving port 7 to the CPU 1 is, for example, MIDI (Musical Instrument Digital).
Interface) terminals, but other communication schemes are also possible.

Although a performance data transmission system is not shown, for example, when data is transmitted after being delayed for a predetermined time by an electronic musical instrument on the transmission side, or data is transmitted by pre-reading automatic performance data by a sequencer. In such an application, it is conceivable to add delay time data to performance data and forward the performance data.

The time data in this case can be a delay time based on the reception time, but can also be a delay time with respect to the clock.

A speaker device 10 is connected to the tone generator (SPU) 2 via a digital / analog converter (D / A) 8 and an amplifier (AMP) 9. Convert to level sound output.

Such an electronic musical tone generator usually has input means such as a keyboard device and a switching panel. However, in the present invention, there is no direct effect, so that the description is omitted.

FIG. 2 is a flowchart showing a main routine of a program showing the operation of the electronic musical sound generating apparatus according to the present invention. With the start of the flow, the CPU 1, the musical tone generator (SPU) 2, the FIFO and the register for the timer,
An initialization routine for initializing other registers and the like is executed (step S100).

Next, the event data for one event (here, 8 bytes) is extracted from the event queue,
A process for storing in the event register (8 bytes) is performed (step S101).

The first four bytes of the 8-byte data are data such as event type and value, and the last four bytes are time data. Here, 0 is returned when the event queue is empty, and a numerical value other than 0 is returned when the event queue is not empty.

Next, it is determined whether or not the event is an event (step S102).
Otherwise, the event is determined to be an event, so the last 4 bytes of the event buffer are set to Y (step S10).
3). If it is determined that the event is not an event, the processes after the event detection process (step S101) are repeated.

Next, the current value of the timer is set to X (step S104). Then, from the above X and Y, the value Z =
An XY calculation process is performed (step S105). Based on the result of the calculation, it is determined whether the event processing scheduled time T such as generation of a musical tone is equal to or greater than the time T (step S106).

If it is determined that Z is equal to or greater than T, a predetermined event process is executed (step S107). If it is determined that the above conditions are not met, the event is
The process returns to the queue (step S108), and the processes after the event detection process (step S101) are repeated.

In the processing described above, the processing of the event (step S107) means the execution of the contents of the event register. For example, the performance mode + data 1 + data 2
(Contents such as key press, key release, tone color change, volume change, pitch change, and the amount of change thereof). After processing these events, event detection (step S
101) Return to the subsequent processes.

FIG. 3 is a flowchart showing an interrupt routine of the interval timer. At appropriate intervals, for example,
The interval timer automatically generated every 1 msec performs an increment process of adding 1 to the current time Tx (step S200), and returns.

FIG. 4 is a flowchart showing an interrupt routine that occurs when performance data is received. The current time Tx (4 bytes) is added to the received event (4 bytes) to make it 8-byte data, and the data is written to the event queue (step S300), and the process returns.

FIG. 5 shows the correspondence between the received data and the data in the event buffer according to the present invention.

As is apparent from the figure, the data at the time of transmission and reception consists of a total of 4 bytes including the performance mode of byte 0, the data 1 of byte 1, the data 2 of byte 2, and the delay time of byte 3. The four bytes up to byte 7 are neither transmitted nor received.

On the other hand, in the event buffer,
The four bytes from byte 0 to byte 3 are the same as at the time of transmission / reception, but the current time Tx is represented by four bytes from byte 4 to byte 7. Here, three bytes from byte 0 to byte 2 correspond to, for example, MIDI data, but other communication methods can be handled by adding a delay time.

FIG. 6 shows the correspondence between the performance mode and the data 1 and data 2. Performance data includes, for example, 8x key press, 9x key release, Ax tone color, Bx
, The pitch of Cx, the effect of Dx, and the like. The data 1 is data for specifying these types by numbers or quantities.

Data 2 is data that quantitatively represents these states, strengths, and the like. Data 1 and data 2 together form overall performance data.

[0036]

The electronic musical sound generator as described above can store performance data such as an automatic performance received from the outside via a transmission path. The performance data stored in this manner includes, in addition to the original performance data such as timbre, pitch, and volume, a delay time for determining a timing at which an event such as tone generation or silence should be executed based on the data. And also stores data on

The performance data stored after reception also includes time information indicating from which point an event such as tone generation or silence corresponding to the original performance data should be started. By adopting such a signal form, data transmission is performed while the transmission path is empty, so that data transmission efficiency is improved, and performance data is transmitted within a predetermined time.

As a result, processing such as generation or silencing of a musical tone can be performed by using performance data previously received and stored in the electronic musical tone generating apparatus. Event processing based on data is guaranteed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an electronic musical sound generating apparatus according to the present invention.

FIG. 2 is a flowchart showing an operation of a main routine in the electronic musical sound generating device according to the present invention.

FIG. 3 is a flowchart showing interrupt processing of an interval timer.

FIG. 4 is a flowchart showing an interrupt process that occurs when performance data is received.

FIG. 5 is an explanatory diagram showing states of transmission data and data in an event buffer in the electronic musical sound generating apparatus according to the present invention.

FIG. 6 is an explanatory diagram showing a performance mode and contents of data 1 and data 2 in the electronic musical sound generating apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central processing unit (CPU) 2 Tone generator (SPU) 3 Read-only memory (ROM) 4 Random access memory (RAM) 5 Address bus 6 Data bus 7 Performance data receiving port 8 D / A converter 9 Amplifier 10 Speaker device

Claims (1)

(57) [Claims] 1. Data receiving means for receiving performance data with a delay time to which a delay time from the reception of performance data to the actual performance is added, and the performance data with a delay time received by the data receiving means. A delay means for delaying by a time corresponding to the delay data received at the same time from when the performance data is received, and a tone generation means for generating or silencing a sound based on the performance data at a time delayed by the delay means. An electronic musical tone generator, comprising: