JPH0518113B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an automatic piano performance device, and in particular,
The present invention relates to a solenoid driving method for driving a solenoid that automatically operates each operator (that is, a key and a pedal) of a piano. An automatic piano performance device usually reads performance data stored in a storage medium such as a floppy disk, converts the read performance data into solenoid drive data, and uses the solenoid drive data to drive the operator. Automatic performance is performed by driving the solenoid. By the way, taking piano keys as an example, the drive mechanism (piano action) that transmits key operations to the hammers may have operating characteristics that change due to changes in ambient temperature, changes in ambient humidity, changes over time, or variations in individual pianos. Therefore, even if the keys are driven based on the same performance data, the hammers are not always driven with the same intensity, but the intensity varies depending on the ambient temperature and the like. The same can be said for pedals. Therefore, the present invention provides a solenoid drive method in an automatic piano performance device that can detect and automatically compensate for changes in the piano drive mechanism (piano action, etc.) based on ambient temperature, etc. and the data obtained based on the output of the sensor for detecting the state of the control provided on the control, and the solenoid drive data is corrected based on the comparison result. It is characterized by driving the solenoid for driving the operator. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the structure of an automatic piano performance device to which the method according to the present invention is applied. In this figure, reference numeral 1 is a piano keyboard, and below each key of this keyboard 1 there is a key on/off button.
A first key switch K ₁ and a second key switch K ₂ (not shown) are provided in parallel for detecting off and keystroke strength. When the keys are operated, first the first key switch _K1 is turned on, and then the second key switch _K2 is turned on. In this case, key-on is detected by turning on the _second key switch K2, key-off is detected by turning off the first key switch _K1 , and the keystroke strength is determined by the time when the first key switch _K1 is turned on and the time when the second key switch K2 is turned on. ₂ is detected based on the time difference from the time when it is turned on. The key switch group 2 is a block showing a collection of the above-mentioned key switches. The key data generation circuit 3 includes the key switch group 2
The on/off state of each key switch is detected by sequentially scanning the output of each key switch.
When a certain key is operated, the _second
It measures the time until the key switch K ₂ turns on, outputs this measurement result (i.e., key operation speed) as keystroke strength data KD (performance data), and also measures the time it takes for the second key switch K ₂ to turn on. At this point, output the key code KC for the same key,
The output of the key code KC is stopped when the first key switch _K1 is turned off. A CPU (central processing unit) 4 controls each part of the apparatus based on a program, and is connected to each part of the apparatus via a bus line 5. ROM (read only memory) 6 is
This is a memory in which a program used in the CPU 4 and a keystroke strength data/solenoid drive data conversion table are stored in advance. RAM
(Random access memory) 7 is a memory for temporarily storing data, and RAM 8 is a memory into which the above-mentioned conversion table in the ROM 6 is written when the power is turned on. 9 is a floppy disk device; 10 is a disk controller that controls the floppy disk device 9; 11 is a pulse generator that generates a clock pulse φ with a constant period (for example, 4 msec); Key drive solenoids 13, 13 provided corresponding to each key
This is a solenoid drive circuit that drives... Among the elements described above, the CPU 4, the key data generation circuit 3, the ROM 6, the RAM 7, the RAM 8, the disk controller 10, and the pulse generator 11 constitute a control device 100. This control device 1
00, control for correcting the above-mentioned keystroke strength data/solenoid drive data conversion table according to the characteristics of the piano and control regarding playback/recording of performance data are performed. Next, the operation of the circuit shown in FIG. 1 will be explained. First, the case where data is recorded on the floppy disk of the floppy disk device 9 will be explained. Every time a clock pulse φ is output from the pulse generator 11, the CPU 4 reads the key code KC and the keystroke strength data KD output from the key data generation circuit 3 at that time, and stores the read data KC and KD in the RAM 7. write to. Next, the key code KC written in RAM7 last time (4 msec ago)
By comparing the key code KC written this time, changes in the on/off state of each key (hereinafter referred to as
Based on the detection result, the event block shown in Fig. 2 is stored in the RAM 7.
Create EB. In this event block EB, the timer data TD is data corresponding to the time from the previous event occurrence time to the current event occurrence time, and the event data ED is data in the format shown in Figure 3 A or B. . Here, Fig. 3A shows a case where the event is a key-on, and in this case, the key code KC of the key that has been turned on, the keystroke strength data KD of the same key, and the data "1" indicating key-on are each an event. data
Written to event block EB as ED. In addition, Figure 3 B shows the case where the event is a key-off, and in this case, the key code of the key that was turned off is
KC and data "0" indicating key-off are each written into event block EB as event data ED. Thereafter, the above-mentioned event block EB is created in the RAM 7 every time the clock pulse φ is supplied. Note that, of course, if no event is detected, the event block EB is not created.
Then, a certain number (or one song) is stored in RAM7.
When the event block EB is created,
The CPU 4 sequentially transfers each event block EB in the RAM 7 to the floppy disk device 9 in the order in which they were created, and writes them on the floppy disk. The above is the operation of the apparatus shown in FIG. 1 during data recording. Next, the operation during data reproduction will be explained. In this case, the CPU 4 first stores a certain number (or one song) of event blocks EB in the floppy disk of the floppy disk device 9 in the RAM 7.
Transfer to. Next, the first event block EB in RAM7 (i.e., when recording data,
Event data of the first created event block (EB) Event data where ED indicates key-on
Check whether it is ED (see Figure 3 A) or event data ED indicating key-off (see Figure 3 B). If the event data is ED indicating key-on, the following processing is performed. That is,
First, the time of timer data TD in the first event block EB is measured. Then, when this time has elapsed, the keystroke strength data KD in the first event block EB is read out, converted into address data, and supplied to the RAM8. Furthermore, as mentioned above, the RAM 8 contains ROM when the power is turned on.
A keystroke strength data/solenoid drive data conversion table in 6 is written. When the address data mentioned above is supplied to RAM8, the keystroke strength data in the first event block EB is sent from RAM8.
Solenoid drive data SD corresponding to KD is read out and supplied to the CPU 4 via the bus line 5.
CPU4 uses the supplied solenoid drive data SD
is output to the solenoid drive circuit 12, and at the same time, the key code KC and data "1" in the first event block EB are output to the solenoid drive circuit 12. When each of these data is supplied to the solenoid drive circuit 12, the solenoid drive circuit 12 outputs a level corresponding to the solenoid drive data SD to the solenoid 13 corresponding to the key code KC (when the solenoid 13 is driven by a pulse signal). outputs a drive signal having a pulse width). As a result, the key corresponding to the key code KC (hereinafter, this key will be temporarily referred to as key A) is driven with an intensity corresponding to the solenoid drive data SD. Next, the CPU 4 generates the keystroke strength data of the key A output from the key data generation circuit 3.
Write KD to RAM7.Here, the keystroke strength data KD written to RAM7 is the keystroke strength data KD in the first event block EB in RAM7.
It should be the same as (ROM to be identical)
The conversion table in 6 is set. ) However, in reality, the operating characteristics of the piano action change based on the ambient temperature, etc., as described above, so these two data KD no longer match. Therefore,
In this automatic piano performance device, both data KD
The conversion table is corrected based on the comparison results, and this correction will be described in detail later. Now, the CPU 4 transfers the key code KC, solenoid drive data SD, and data "1" related to the first event block EB to the solenoid drive circuit 1.
After outputting to 2, the following processing is performed. That is, the event data of the second event block EB
Check whether ED is event data ED indicating key-on or event data ED indicating key-off. If the event data ED indicates key-on, the same processing as described above is performed, but the event data ED indicates key-off.
If it is ED, measure the timer data TD of the second event block EB, and when this time elapses, send the key code KC and data "0" in the same event block EB to the solenoid drive circuit 12. Output to. Note that the process of writing the above-mentioned keystroke strength data KD of key A to the RAM 7 is performed during the above-mentioned time measurement. When the key code KC and data "0" of the second event block EB are supplied to the solenoid drive circuit 12, the solenoid drive circuit 12 turns off the drive signal of the solenoid 13 corresponding to the supplied key code KC. . As a result, the key corresponding to the key code KC is turned off. Thereafter, the CPU 4 sequentially repeats the above-described process for each of the third, fourth, etc. event blocks EB. Then, at the time when, for example, ten keystroke strength data KD are written into the RAM 7, the above-mentioned conversion table is corrected. Next, an example of this correction will be described in detail. Now, the keystroke strength data in the event block EB corresponding to the first, second, etc. keystrokes
KD (hereinafter referred to as get data GKD) and keystroke strength data obtained from each of these keystrokes
KD (hereinafter referred to as sense data SKD), respectively.
For example, let us assume that it is shown in Table 1.

【table】 …

Claims (1)

[Claims] 1. Read performance data from the storage medium 9, convert operation strength designation data (KD) included in the performance data into solenoid drive data (SD),
This is a solenoid drive control device for a player piano in which a solenoid 13 performs automatic performance by driving a performance operator 1 according to the solenoid drive data (SD), and includes a sensor 2 and a control device 100, and has a sensor 2 and a control device 100. 2 detects the strength of the operation performed on the performance controller 1 and outputs it as operation strength measurement data (SKD). The control device 100 has a CPU 4 and a memory 8, and the memory 8 is A conversion table that associates operation strength specification data (KD) with solenoid drive data (SD) is stored, and the CPU 4 converts operation intensity specification information (KD) included in the performance data into solenoid drive data (SD) according to the conversion table. ) and give it to the solenoid 13, and according to this solenoid drive data (SD), obtain operation strength measurement data (SKD) from the sensor 2 indicating the operation strength of the performance controller 1 driven by the solenoid 13, A solenoid drive control device for a player piano that increases or decreases the solenoid drive data (SD) in the conversion table based on the operation strength measurement data (SKD).