JPS59109089A - Solenoid driving for automatic piano performer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic piano accompaniment device, and more particularly to a solenoid driving method for driving a solenoid that automatically operates each operator (ie, keys and pedals) of a piano.

Automatic piano performance devices usually read performance data stored in a storage medium such as a floppy disk, convert the read performance data into solenoid drive data, and then operate the solenoid for operating the operator based on this solenoid drive data. to perform automatic entertainment.

By the way, taking piano keys as an example, the operating characteristics of the drive mechanism (piano action) that transmits key operations to the hammers change due to changes in ambient temperature, changes in ambient temperature, aging, or variations in individual pianos. And for this reason,
Even if the keys are driven based on the same performance data, the hammers are not always driven with the same intensity, and the intensity varies depending on the ambient temperature and the like. The same can be said for pedals.

Therefore, this invention aims to drive the piano based on the ambient temperature, etc.
The present invention provides a solenoid drive method in an automatic piano performance device that can detect changes in t7I+7 (piano action, etc.) and automatically compensate. The data obtained based on the output of the sensor is compared, and the solenoid drive data is corrected based on this comparison result. From then on, the controller T is adjusted based on the corrected solenoid ltl<l+ data.
It is characterized by driving a solenoid for E<t)+.

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

FIG. 1 is a block diagram showing the configuration of an automatic piano performance device to which the method according to the present invention is applied. In this diagram,
Reference numeral 1 indicates a piano keyboard, and below each key on this keyboard 1 there is a @1 key switch for detecting key on/off and the strength of the striking part, and a second key switch (not shown). ) are provided in parallel.

Then, when you operate a key, the first key switch
is turned on, and then the second key switch is turned on. In this case, key-on is detected by turning on the second key switch, key-off is detected by turning off the first key switch, and pressing M@R is detected by turning on the first key switch and the time when the second key switch is turned on. To,
It is detected based on the time difference from the time when the switch is turned on. Is key switch group 2 a collection of the key switches mentioned above? This is the block shown. The key data generation circuit 3 sequentially scans the output of each key switch in the key switch group 2 to detect the on/off state of each key switch. 1 on key switch
Measure the time from when 2 is turned on to when 2 is turned on to the second key switch, and output this measurement result (i.e., key operation speed) as f - hitting force; W data KD (performance data). , also on the second key switch! When 8 is turned on, the key code KCf- of the same key is output, and when 8 is turned off to the first key switch, the output of the key code KC is stopped. CPU (central processing unit) 4
is for controlling each part of the apparatus based on a program, and is connected to each part of the apparatus via a path line 5. RO~
A read-only memory 6 is a memory in which a program used by the CPU 4 and a keystroke data/solenoid drive data 'φ conversion table are stored in advance. A RAM (random access memory) 7 is a memory for temporary data storage JET, and a RAM 8 is a memory into which the above-mentioned conversion table in the ROM 6 is written when the power is turned on. Further, 9 is a floppy disk device, 10 is a disk controller that controls this floppy disk device 9, 11 is a pulse generator that generates a flock pulse signal with a constant period (for example, 4 m5 ec), and 12 is a keyboard 1.
A key drive lever is provided corresponding to each key.
This is a solenoid driving method for driving the id 13, 13...

Next, the operation of the circuit shown in FIG. 1 will be explained. At the beginning of i-throw,
The case where data is recorded on the floppy disk of the floppy disk device 9 will be explained.

Every time a clock pulse signal is output from the pulse generator 11, the CPU 4G reads the key code KC and the strong change data KD output from the key data generation circuit 3 at that time, and reads each of the read data. K.C. and K.D.
Write to FRAM7. Next, the previous time (4 m s
ec'+)if) By comparing the key code KC written to RAM 7 and the key code KC written this time, changes in the on/off state of each key (hereinafter referred to as an event) are detected. Based on this detection result, I'
Event block EB shown in FIG.
Create. 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 in the format shown in Figure 3 (a) or 1). It is data. Here, FIG. 3 (A) shows a case where the event is a key-on, and in this case, the key "code K C" of the key in the on state and the hitting strength data K of the key
D and data 11'' indicating key-on are each written to the event block EB as event data ED, and also,
Figure 5 (b) shows a case where the event is a key-off, and in this case, the key code KC of the key that was turned off and the key-off?
The indicated data "0" is written into the 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 pulse is supplied. 16,
Of course, if no event is detected, the event block EB is not created.

Then, when a certain number (or -4) of event blocks EB are created in the RAM 7, the CPU 4 creates each event block EBF in the TtAM 7 and sequentially transfers the created l1k7 to the floppy disk device 9, Write the floppy disk number.

The above is the eleventh operation of the apparatus during data recording. Next, the operation during data reproduction will be explained.

In this case, CT'U4 first stores a certain number of floppy disks (or C-11d) in the floppy disk of the floppy disk device 9.
Transfer the event block EB of l) to It A M 7. Next, the event data E of the previous event block EB in 'R, A M 7 (that is, the first event block EB created at the time of data recording)
Event data ED where D indicates key-on (Figure 3 (a)
(see) or event data indicating key-off festival ED
(Check whether it is the third [J(ro)@teru). If the event data is ED indicating key-on, the following processing is performed. That is, first, the time of the 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 ET3 is read out, converted into address data, and supplied to the RAM8. In addition, R.A.M.S.
Inside the +11J, as mentioned above, when the power is turned on, the RO
A keystroke strength data/solenoid drive data conversion table in the MG is written. 'When the address data mentioned above is supplied to the RAM 8, the solenoid actuation data SD corresponding to the key press strength data KD in the first event block EB is read out from the RAM 8, and is supplied to the CPU 4 via the pass line 5. Ru. The CPU 4 outputs the supplied solenoid drive data SD to the solenoid drive circuit 12, and at the same time outputs the first event block ET.
Tweet the key code KC and data “1” in J/
output to the side drive circuit 12. When each of these data is supplied to the solenoid differential circuit 12, the solenoid drive circuit 12 selects the solenoid 1 corresponding to the key code KC.
3. A drive signal having a level (pulse width when the solenoid 13 is driven by a pulse signal) corresponding to the solenoid drive data SD is output. As a result, the key corresponding to 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 determines the number of key data generation times V.
The keystroke strength data KD of key A output from 13 is iI.
Write to A M 7, here, the attack Di 13Iir office data KD written to RAM 7 should be the same as the attack strength data KD in the first event block EB in RAλ47 (same and (The conversion table in the ROM 6 is set so that the above-mentioned data KD does not match.) However, since the operating characteristics of the piano action change based on the ambient temperature and the like mentioned above, these two data KD no longer match. So, what about this automatic piano performance device? '／
In the above, the conversion table is corrected based on the comparison result of both data KD, and this correction will be explained in detail later.

Now, CPU4 is +71. Key code K C, solenoid P2 related to event block ET3 of i
1. After outputting the IH data SD and data "1" to Solenoid Town Wanaka I Road 12, the following processing is performed. That is, it is checked whether the event data ED of the second event block EB is the event data ED indicating key-on P or the event data ED indicating key-off. If the event data is ED indicating key-on, gl, F!, which is the same as the above-mentioned Sy. l '5-But if the event data ED indicates that the key is off, the timer data T of the second event block EB is
Measure the time D, and when this time elapses, the key code KC and data "0" in the same event block EB are
is output to the solenoid movable circuit 12. It should be noted that the process of writing the keystroke strength data KD of key A mentioned above to the RAM 7 cannot be performed during the 1fJI measurement as described above. When the key code KC and data "0" of the second event block EB are supplied to the solenoid vR drive circuit 12, the key code K supplied to the solenoid vR drive circuit 12 is
The Ull signal of the solenoid 13 corresponding to C is turned off. As a result, the key corresponding to the key code KC is turned off.

Jsu bottom, CP 04 Get 6'$th, No. 4 [1.
The above-mentioned processing is performed for each event block EI3. Repeat sequentially. Then, for example, 1 in RAM7.
At the time when 0 stroke 8 strength data KD has not been written, the above-mentioned conversion table is corrected. Next, an example of this correction will be described in detail.

Now, the 1st stroke strength data KD (hereinafter referred to as get data GKD) in the event block EB for the 41st stroke G ((41 points) and the second... The hitting strength data KD (
The sense data (hereinafter referred to as sense data S K D) are shown in Table 1, for example.

Table 1 In this case, the CPU 4 first stores each get data G in Table 1.
Solenoid drive 191+data SD corresponding to each of KD and sense data SKD is read from the conversion table in R, AM8 and stored in RAM7.

The read solenoid drive data 5Df-[shown in Table 1]. Here, in the first row of Table 1 (as is clear from the first hammer 9, when the solenoid drive data SD is "30", the sense data 5KD (t, that is, the actual striking part elongation) is It becomes "55". Therefore, the data KD
If you rewrite the solenoid drive data SD r32J in RAMB corresponding to r55J to "30", the sense data S when you press the key with get data GKDr55J and press 1.
You can get KD "55". In other words, from the first line of Table 1, as the correction data [-2J (30-32)
can be obtained. Similarly, r-3J, r-2J, etc. from ff52nd line, 3rd line, etc., respectively.
1!4 correction data can be obtained.

After storing each solenoid drive data shown in Table 1 in the RAM 7, the CPU 4 obtains the above-mentioned correction data from each solenoid drive data SD, and further,
Find the average surface of each correction data. Next, the obtained average value is added to all the solenoid drive data SD in RAM,8. In this way, the conversion Ziegel correction in RAM 5 cannot be performed.

The following is the process of correcting the conversion table. Such corrections are made in 11. This is performed every time ten sense data SKD are written into AM7, and thereby the conversion table in RAM MB is successively corrected. As a result, it becomes possible to hit each key on the deer with a force that accurately corresponds to the get data GKD.

In addition, the correction of the conversion table mentioned above is as follows: g (x)=
t (x) 10C... (1) Generation, x: Get data GKD t (X): Blenoid drive data SDgk before conversion)
: Solenoid town J1 data after change J% SDC: Correction data is calculated based on the formula, for example, g(x)=
f(x)+C+x+(4-------(2)R; (x
)=f(X)・C8 (3) The conversion table may be corrected based on a formula such as (3). In the case of using Kowara's equation, it goes without saying that each of the correction data C1, Ct, and Cs is determined based on the sense data SKD for the number of sheets.

Furthermore, in the above-described embodiment, a case has been described in which the error in the strike force IW is automatically corrected, but the present invention corrects, for example, an error occurring in the key-on time, the key-off time, or an error in the pedal drive time, etc. Of course, it can also be applied when doing so.

In addition, in the above embodiment, the conversion table in R,,1,f8? Although the correction is performed regularly using the average value of the correction data, for example, the average value of the correction data for each octave is calculated, and each solenoid drive data in the conversion table is individually corrected for each octave using each calculated average value. You may also do so.

As claimed above, according to the invention, the performance data stored in the recording medium is compared with the data obtained based on the output of the sensor for detecting the state of the operator, and based on the comparison result, Solenoid drive! Correct the 1111 data,
From then on, the σ2 solenoid for operating the operator was driven based on this ``σ'' solenoid drive data. Even if the operating characteristics of the piano drive mechanism change over a relatively long period, there is an advantage that the piano operator B can always be driven in an operating state corresponding to the moxibustion data.

[Brief explanation of the drawing]

Figure 1 shows the fruit of this invention kF! Figure 2 is a block diagram showing the configuration of AJ.
These are diagrams showing the format and data content of event data ED in the same event block EB. 1...Keyboard, 2...Key switch group (sensor)-3...Key data generation circuit, 4...
CPU, 6...ROM, 7.8...RAM
, 9... floppy disk device, 12...
・Solenoid drive circuit.

Claims (1)

[Claims] A solenoid drive method in an automatic piano performance device, which reads performance data stored in a storage medium, converts the read performance data into solenoid drive data, and drives a solenoid for driving an operator based on the solenoid drive data. In the step, the performance data recorded in n11 is compared with data obtained based on the output of a sensor for detecting a control element provided on the control element, and the solenoid drive data is corrected based on the comparison result. , Hereafter, the solenoid driving method in the automatic piano performance device t is characterized in that the vf characteristic is to drive the solenoid 'fr- written as if by the corrected solenoid μ→11 data.