JP2002062873A - Automatic playing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a timing generating means for reproducing musical performance data having different resolution at the same time. SOLUTION: Different kinds of musical performance data with different resolution which are stored in storage parts 16 and 18 are read out to a sound source device 8 according to musical performance timing information and reproduced. Counters 12 and 13 count up in response to an interruption signal generated by a timer device 7 to read the pieces of musical performance data. When a counter value matches the musical performance timing information, the musical performance data are read out. Here, since the period of the interruption signal is determined according to specific resolution D, when musical performance data having other resolution Dm are read out, a count correction part 14 varies the variation quantity of the counter value of the counter 13 in correspondence with one input of the interruption signal according to the resolution Dm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic performance device, and more particularly to an automatic performance device suitable for reading performance data having different resolutions from a common clock source to a sound source or the like.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a main configuration of a tone generator in a conventional automatic performance device. In the figure, a cycle setting unit 100 has a tempo (the number of quarter notes per minute) T and a resolution (the number of clocks per quarter note) D
, The timer period t is calculated by the following equation. Timer cycle t (μsec) = 60000000 / T / D. The calculated timer cycle t is set in the timer, that is, the frequency dividing unit 200. The timer 200 outputs an interrupt signal at a period t based on the reference clock CK.

The counter 300 adds a counter value in response to the interrupt signal. When the counter value coincides with the step time input from the step time setting section 400, the performance data to be read at that step time. Is read from the performance data storage unit 500 to the tone generator 600, and various parameters are set to the selected channel. The step time setting unit 400 includes a counter 300
Is set to "0" as an initial value, and every time performance data is read out, the reset value of the counter 300 is updated at the step time described in the performance data. Thus,
Each time the counter 300 counts up, the performance data is read out, and the sequence of the automatic performance proceeds.

[0004]

[0005] Depending on the type of automatic performance, processing may not be possible only by a simple timer interrupt. For example, the tempo of the style, which is the repetitive sound of short performance data such as drums and bass, and the timbre of the strumming style, is determined by the timer cycle corresponding to the resolution unique to the automatic performance device. Therefore, it is impossible to simultaneously play the style or strumming tone and the like and song data having different resolutions such as SMF (standard MIDI file).

When simultaneously playing performance data having different resolutions, it is necessary to use separate timers to generate timer interrupts having different resolutions. If a timer is not provided for each of them, it is necessary to take measures such as sacrificing the tempo of the strumming tone color or providing a restriction so that the performance of the style cannot be performed simultaneously with the song data. As described above, there is a problem that it is difficult to simultaneously play performance data having different resolutions from each other, or even if it can be performed, the configuration becomes complicated.

An object of the present invention is to solve the above-mentioned problems and to provide an automatic performance apparatus capable of reproducing a plurality of pieces of performance information having different resolutions according to a common clock source.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention provides a method for storing a plurality of types of performance data having different resolutions stored in a storage means, using a performance timing included in the performance data. In an automatic performance device which reads out and reproduces the data in a sound source device according to information, a timer means for generating an interrupt signal at a predetermined period, and a timer means provided corresponding to each type of performance data and counting in response to the interrupt signal Counter means for counting up when the counted counter value becomes a value corresponding to the performance timing information;
Count correction means for changing the amount of change in the counter value of the counter means with respect to one input of the interrupt signal in accordance with the resolution of each type of performance data. The first point is that a plurality of types of performance data having different resolutions are read out from the storage means in response to the tone generator.
There is a feature.

According to the first feature, in the counter means in which the counter value is updated in response to an interrupt signal output from the timer means, the counter value updated in response to a single interrupt is based on the performance data. It can be changed according to the resolution.
Therefore, the performance timing of the performance data having different resolutions can be determined based on the counter value of the counter means provided for each type of performance data.

[0009] In the present invention, the cycle of the interrupt signal may be set as follows:
A second feature is that the calculation is performed based on the tempo and the resolution of one of the plurality of types of performance data.

Further, according to the present invention, the count correction means sets a resolution of the one performance data as a reference resolution, and changes a change amount of the counter value at a ratio of a resolution of each type of performance data to the reference resolution. There is a third feature in the point configured as described above.

According to the second and third features, the interrupt signal generated by the timer means is counted by the counter means,
When the counter value becomes a value represented by the performance timing information, a timing for reading the one performance data is generated. On the other hand, the change amount of the counter value for generating the timing for reading out the performance data other than the one performance data is changed according to the resolution of the performance data.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the automatic performance device according to one embodiment of the present invention. In FIG. 1, a CPU 1 has a ROM 3, a RAM 4,
It is connected to the control panel 5, the external storage device 6, the timer device 7, and the sound source device 8. Further sound source device 8
Is connected to a sound system 9. ROM3 contains C
The control program of PU1 and the waveform data are stored.
In the RAM 4, various registers necessary for executing the program by the CPU 1 and areas for storing performance data are set.

The performance data is described in note units, and each includes musical tone information such as pitch and velocity, and step time (time to next sound) as performance timing information. The performance data may be supplied from the external storage device 6 or may be supplied from an external MIDI device (not shown) via the MIDI interface 10. The control panel 5 is provided with a power on / off switch, a tone color information selection switch, and the like. The timer device 7 has a means for generating an interrupt cycle for reading performance data from the RAM 4 to the tone generator 8 based on the tempo and the resolution.

The tone generator 8 has a function of synthesizing a musical tone by, for example, a sine wave addition method, and outputs a musical tone signal based on the tone color information and the performance data. The sound source device 8 supplies a tone signal to each of a left speaker and a right speaker included in the sound system 9. Since the tone signal output from the tone generator 8 is a digital signal suitable for computer processing, a D / A converter (not shown) is provided to convert the tone signal into an analog signal suitable for the sound system 9. .

FIG. 1 is a block diagram showing the main functions of an interrupt processing unit for reading out performance data in the automatic performance device. The cycle setting unit 11 sets in the timer device 7 an interrupt cycle t determined by a resolution D (here, “96”) specific to the automatic performance device and a given tempo T. The interrupt cycle t is calculated using the calculation formula described in the section of the related art. The timer device 7 outputs an interrupt signal at a period t based on the reference clock CK.

An interrupt signal having a period t is input to the first counter 12 and the second counter 13. However, the interrupt signal of the cycle t input to the second counter 13 is corrected by the count correcting unit 14 and then input to the second counter 13. The first counter 12 is provided for reading out performance data, such as a style and a strumming tone, which progresses in a cycle based on the resolution of "96" which is the same as the resolution of the automatic performance device. It is provided for reading performance data progressing at a cycle based on individual resolution.

For example, if the performance data is of style or strumming and its resolution, that is, the number of timing clocks per quarter note is "96", which is the same as the resolution of the automatic performance device, The input signal is directly input to the first counter 12 and the counter value “1” is added to the first counter 12. On the other hand, if the performance data is a song and the resolution is different from the resolution “96” of the automatic performance device, the interrupt signal is corrected by the count correction unit 14 and is sent to the second counter 13. Is entered.

That is, the count correction unit 14 corrects the interrupt signal output from the timer device 7 according to the resolution, and changes the value added by the second counter 13 by one interrupt signal. When the resolution is Dm and the correction ratio for the counter value “1” is dt, dt = Dm
/ D (where D = 96). For example, the resolution D
If m is “120”, dt = 120/96 = 1.25
It is. Here, since the load is large to perform the floating point operation by the CPU, 65536 is set to the value “1.25”.
The result is multiplied by (0 × 10000), and the higher 16 bits of the multiplication result are used as the integer part to be added to the counter value of the second counter 13, and the lower 16 bits are used as the decimal part and used in the next addition.

The first counter 12 adds the counter value in response to the interrupt signal. The first counter 12
It counts up when the counter value matches the step time input from the first step time setting unit 15. In response to the count-up, the performance data to be read in step time is read from the first performance data storage unit 16 to the tone generator 8, and various parameters for generating a musical tone are set in the selected channel. The first performance data storage unit 16 stores performance data at a tempo determined by a resolution “96” unique to the automatic performance device.
For example, performance data of a style is stored.

On the other hand, the second counter 13 adds its counter value in response to the corrected interrupt signal. Second
The counter 13 counts up when its counter value matches the step time input from the second step time setting unit 17. In response to the count-up, the performance data to be read at the step time is read from the second performance data storage unit 18 to the tone generator 8, and various parameters for generating a tone are set in the selected channel. . The second performance data storage unit 18 stores performance data of a tempo based on an individual resolution different from the resolution “96” unique to the automatic performance device, for example, song performance data.

First step time setting section 15 and second step time setting section 15
The step time setting unit 17 sets "0" as an initial value in the first counter 12 and the second counter 13, respectively, and every time the performance data is read out, the first counter 12 and the second counter 13 are set at the step time described in each performance data. 2
The reset value of the counter 13 is updated. Thus, the first
Each time the counter 12 and the second counter 13 count up, the performance data is read out one by one, and the automatic performance sequence proceeds.

Note that the CPU 1 operates in the
In the case where the register does not have a register large enough for the operation of No. 4, the count correcting unit 14 can be modified as follows. That is, the count correction unit 14 is constituted by a table. FIG. 3 shows an example of the table. As shown in the drawing, values to be added to the first counter 12 and the second counter 13 are set corresponding to each resolution. The count correction unit 14 is provided commonly to the first counter 12 and the second counter 13, and responds to an interrupt signal of the cycle t output from the timer device 7, and sets a value set for each resolution. Is input to the first counter 12 and the second counter 13.

For example, if the resolution is "96", "1, 1,
.., "1" is always read out for each interrupt. However, when the resolution is other than “96”, for example, when the resolution is “120”, like “1,1,1,2,.
The value “2” is read once every four times. Thus, the ratio of the value added to the first counter 12 and the second counter 13 can be changed.

Further, the present embodiment can be modified as follows. FIG. 4 is a functional block diagram of a main part according to a modification, and the same reference numerals as in FIG. 1 indicate the same or equivalent parts.
In the figure, the timer device 7a is configured to output an interrupt signal at predetermined constant values regardless of the tempo T and the resolution D. If this interrupt cycle is the same as the cycle (for example, 2 msec) used for blinking an LED as various indicator lights provided on the control panel 5, the timer devices 7a can be used as one another. The first counter 12 is provided with a first count correction unit 14a, and the second counter 13
The second count correction units 14b are provided in correspondence with each other.

When the resolution is Dm and the correction ratio to the counter value "1" is dt, the first count correction unit 1
In 4a, dt1 is calculated as dt1 = 2 / ((60000 / T) / D (where D = 96).
In 4b, dt2 = 2 / ((60000 / T) / Dm. For example, the tempo T is “100” and the resolution Dm
Is "120", dt1 = 0.32.
2. Here, since the load is large for performing the floating point operation by the CPU, 65536 (0 × 1
0000), and the upper 16 bits of the multiplication result are added to the counter value of the second counter 13 as an integer part.
Six bits are used as a decimal part at the time of the next addition.

[0026]

As is apparent from the above description, according to the present invention, a plurality of types of performance data having different resolutions are generated based on an interrupt signal supplied from a common clock source (timer means). It can be read and played back by the device. In particular, according to the second and third aspects of the present invention, the change amount of the counter value in one interrupt is corrected only for reading performance data having a resolution different from the resolution used for determining the cycle of the interrupt signal. Is done.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating main functions of an automatic performance device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a hardware configuration of the automatic performance device according to one embodiment of the present invention.

FIG. 3 is a diagram showing an example of a table constituting a count correction unit.

FIG. 4 is a block diagram showing main functions of an automatic performance device according to a modification.

FIG. 5 is a block diagram showing functions of a main part of a conventional automatic performance device.

[Explanation of symbols]

1 CPU, 5 control panel, 7 timer device, 11 cycle setting section, 12 first counter,
13 ... second counter, 14 ... count correction unit, 16 ...
First performance data storage unit, 18... Second performance data storage unit

Claims (3)

[Claims] 1. An automatic performance device which reads out and reproduces a plurality of types of performance data having different resolutions stored in a storage means in accordance with performance timing information included in the performance data and reproduces the interrupt signal at a predetermined period. Timer means for generating, respectively provided corresponding to each type of performance data,
Counter means for counting up when a counter value counted in response to the interrupt signal becomes a value corresponding to the performance timing information; and a change amount of the counter value of the counter means for one input of the interrupt signal. Count correction means for changing the performance data for each type of performance data in accordance with the resolution thereof. In response to the count-up of the respective counter means, a plurality of types of performance data having different resolutions are respectively stored from the storage means. An automatic performance device characterized by being read out to a sound source device. 2. The automatic performance according to claim 1, wherein the cycle of the interrupt signal is calculated based on a tempo and a resolution of one of the plurality of types of performance data. apparatus. 3. The apparatus according to claim 1, wherein the count correcting means sets a resolution of the one performance data as a reference resolution, and changes an amount of change of the counter value by a ratio of a resolution of each type of performance data to the reference resolution. 3. The automatic performance apparatus according to claim 2, wherein: