JPH0827623B2 - Automatic playing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic musical instrument of an electronic musical instrument.

2. Description of the Related Art In recent years, electronic organs and electronic keyboards have been equipped with an automatic performance function that automatically outputs all or part of the melody, parallel performance, and rhythm. Also, as a single function for rhythm output only, a so-called rhythm box dedicated to drum percussion has been developed (for example, Japanese Patent Laid-Open No. 56-66897). The automatic performance described above with reference to the drawings. The device will be described.

FIG. 3 shows the structure of a conventional automatic performance device.

In FIG. 3, 101 is a tempo adjustment input unit, 102 is a tempo control unit, 103 is a clock generation unit, 104 is a musical tone information memory, 105 is a musical tone generation unit, and 106 is a generation / stop instruction unit.

The operation of the automatic performance device configured as described above will be described below.

The tempo adjustment input unit 101 outputs a tempo count value corresponding to an input instructed by a tempo adjustment switch such as a slide volume in order to adjust the tempo of the output automatic performance. That is, when the current tempo count value is A and the tempo is instructed to be half speed by the tempo adjustment instruction input, a value twice as high as A is output as a new tempo count value.

Assuming that the tempo count value is X and the speed corresponding to the input of the tempo adjustment instruction is Y, the relationship between X and Y is expressed by equation (1).

Here, W is a predetermined constant.

The tempo control unit 102 counts the clocks output from the clock generation unit 103, and the count result is the tempo adjustment input unit 10
When it becomes equal to the tempo count value input from 1, the clock count value is reset to 0, and the address output to the tone information memory 104 is incremented. If the clock count value and the tempo count value are not equal, the tempo control unit 102
Repeats the above-mentioned operation, but when the stop instruction is issued to the generation / stop instruction unit 106 and the stop instruction signal is output from the generation / stop instruction unit 106, the clock counting operation is stopped and the clock count value is stopped. And the address are reset together.

It is assumed that the tone information memory 104 stores tone information relating to the tone to be output. Here, with regard to the musical tone information, it is assumed that the information on the start, the continuation, and the stop of the generation is expressed by one word, and the information on the start of the generation also includes the information on the tone color, the volume, and the pitch. It shall be included. Each piece of such information corresponds to the minimum unit of the musical note expression for automatic performance.
It is assumed that they are sequentially stored in 4.

The musical tone generating section 105 outputs a musical tone according to the musical tone information output from the musical tone information memory 104 corresponding to the address output from the tempo control section 102.

After performing the tempo adjustment by the above operation, the generation / stop instructing unit 106 temporarily stops the operation, and then the generation / stop instruction unit 106 is used to start the generation at the timing to be output.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, when the tempo is changed during the automatic performance, it is difficult to set the subtle tempo change desired by the user at the time of the change. There was a point.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an automatic performance device capable of easily and naturally setting a subtle tempo change during automatic performance.

Means for Solving the Problems In order to achieve this object, the automatic performance device of the present invention has a tempo input section for generating a timing signal corresponding to a timing corresponding to an input tempo, and a clock generation for generating a clock. Section, a coefficient output section that outputs an interpolation coefficient, an invalid input instruction section that outputs a coefficient determination reference value for determining invalidity, and a result of counting the time interval between the timing signals by the clock is the counting determination. When the value is smaller than the reference value, a tempo count value serving as a reference value for tempo setting is calculated, and a value interpolated with the tempo count value output immediately before based on the interpolation coefficient is output as a new tempo count value. Outputs a periodic timing signal for updating musical tone information from the tempo calculator, the tempo count value output from the tempo calculator, and the clock. A tempo control section and a performance output section that sequentially outputs performance outputs according to a periodic timing signal for updating the musical tone information, and the clock count result in the tempo calculation section is higher than the count determination reference value. When the value is large, the tempo count value is not calculated.

Operation With this configuration, when an input is made to the tempo input section at a timing corresponding to the tempo, the tempo input section sequentially outputs corresponding timing signals. The tempo calculator counts the time interval between the timing signals according to the clock, and when the count result is smaller than the count determination reference value, after calculating the tempo count value that is the reference value for tempo setting based on the count result, Further, the tempo count value output immediately before and the calculated tempo count value are interpolated according to the interpolation coefficient value, and the result of the interpolating operation is output as a new tempo count value. The tempo control section outputs a signal for updating the musical sound information to the performance output section at each cycle corresponding to the tempo of the automatic performance from the input tempo count value and clock, so that the performance output section follows the tempo input. The tempo will be automatically output. On the other hand, when the count result in the tempo calculation unit is larger than the count determination reference value, the above-mentioned tempo count value calculation is not performed. The automatic performance according to the count value will be continued.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an automatic musical instrument according to an embodiment of the present invention.

In FIG. 1, 1 is a tempo input unit, 2 is a tempo calculation unit, 3 is a coefficient designating unit, 4 is an invalid input designating unit, and 5 is a performance output unit. Reference numeral 102 is a tempo control unit, 103 is a clock generation unit, 104 is a musical tone information memory, 105 is a musical tone generation unit, and 106 is a musical tone generation unit.
Is a generation / stop instruction unit, which has the same configuration as the conventional example.

First, when an input is made to the tempo input section 1 at a timing corresponding to the tempo, the tempo input section 1 sequentially outputs a timing signal at a timing corresponding to each input.

The tempo calculation unit 2 starts counting the clocks input from the clock generation unit 103 when the i-th timing signal is input from the tempo input unit 1 and receives the (i + 1) th timing signal when input. Clock count result N
_While holding _{i, i + 1} , counting of the clock for the (i + 1) th timing signal is started. On the other hand, the tempo calculation unit 2 compares the clock count result N _{i, i + 1} with the count determination reference value N _MAX output from the invalid input instruction unit 4, and determines that N _{i, i + 1} ≧ N _MAX . When the tempo count value is not calculated.

When N _{i, i + 1} <N _MAX , the tempo count value is calculated.

Here, the tempo count value calculation is calculated as follows.

If the tempo count value to be calculated is L _j using the clock count result N _{i, i + 1} , Becomes Here, l is the minimum unit of the note expression for automatic performance described in the conventional example, and when the tempo is given in units of 1 beat, the minimum unit is 16th note l = 4.

Calculated tempo count value L _j and tempo count value calculated and output immediately before From, the tempo count value to be calculated and output Is calculated by equation (3).

Here, C is an interpolation coefficient output from the coefficient instruction unit 3, and 0 ≦ C ≦ 1 (4).

As described above, the tempo count value output from the tempo calculator 2 by the equations (2) and (3) Is calculated.

The tempo calculator 2 repeats the above operation. Further, when T is finally a time interval corresponding to one tempo beat, n is expressed as a formula (5) with a clock time interval.

T = · n · l (5) The tempo control unit 102 receives the input tempo count value Based on the above, the same operation as in the conventional example is repeated by counting the clocks from the clock generator 103, so that the performance output unit 5 outputs an automatic performance output.

 The relationship between the above signals is shown in FIG.

It should be noted that the tempo control unit 102 instructed to start and stop the operation by the generation / stop instruction unit 106 as described above is finally validly input regardless of whether or not the automatic performance is being performed. Since the tempo control is performed based on the tempo count value, the tempo can be input at an arbitrary time point before the automatic performance is started or during the performance.

As described above, according to the present embodiment, the tempo count value L _j calculated from the clock count result in the tempo calculator 2 is output from the tempo count value to be output. Tempo count value that was output immediately before to determine Since the linear interpolation is performed, the tempo can be adjusted such that the timing gradually approaches the desired tempo while the timing input corresponding to the desired tempo is repeated. Also, by changing the interpolation coefficient C, the asymptotic degree of tempo adjustment can be controlled.

EFFECTS OF THE INVENTION The present invention enables the tempo calculator to calculate a tempo count value serving as a reference value for tempo setting based on a timing signal corresponding to a timing input corresponding to the tempo input from the coefficient designating unit. Since the tempo count value is interpolated by the output interpolation coefficient, a slight tempo change can be realized. Further, by changing the interpolation coefficient, it is possible to set the tempo before starting the automatic performance and to adjust the degree of tempo change during the automatic performance. Furthermore, because the tempo change is not executed when the clock count result is larger than the count judgment reference value to detect invalid input, it is not necessary to continue inputting the tempo equivalent during automatic performance, and the tempo can be changed when desired. You can adjust the tempo just by making a corresponding input.

[Brief description of drawings]

FIG. 1 is a block diagram of an automatic performance device according to an embodiment of the present invention, FIG. 2 is an exemplary relationship diagram of data according to an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional automatic performance device. is there. 1 ... tempo input section, 2 ... tempo calculation section, 3 ... coefficient instruction section, 4 ... invalid input instruction section, 5 ... performance output section, 10
2 …… Tempo control unit, 103 …… Clock generation unit, 106 ……
Start / stop instruction section.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-58-7191 (JP, A) JP-A-59-58487 (JP, A) JP-A-58-1192 (JP, A) JP-A-59- 40699 (JP, A)

Claims (1)

[Claims] 1. A tempo input section for generating a timing signal corresponding to a timing corresponding to an input tempo, a clock generation section for generating a clock, a coefficient output section for outputting an interpolation coefficient, and an invalidity determination section. An invalid input instructing section that outputs a coefficient determination reference value and a tempo count value that becomes a reference value for tempo setting when the result of counting the time interval between the timing signals by the clock is smaller than the count determination reference value Then, the tempo calculation unit that outputs a value that is interpolated based on the interpolation coefficient between the tempo count value output immediately before and a new tempo count value, and the tempo count value and the tempo count value output from the tempo calculation unit. A tempo control unit that outputs a periodic timing signal for updating musical tone information from a clock, and a periodic timing for updating the musical tone information. And a performance output unit for sequentially outputting performance output according to the number, and the tempo count value is not calculated when the clock count result in the tempo calculation unit is larger than the count determination reference value. Playing device.