JPH03260710A - Motor controller for motor drive type knob - Google Patents

Abstract

PURPOSE:To stably move each motor drive type knob to its target position by adjusting the drive characteristic of each knob in response to the variance of the action characteristic of each knob. CONSTITUTION:When the functions are switched by a function selecting means 14, a motor control means 12 reads the information on the operating positions including up to the precedent one out of a memory 16 in regard of the corre sponding function. Then the position of a motor drive type knob 10 is fed back to the relevant operating position. In this case, the means 12 selects the final value (D0) function of a duty cycle out of a D0 table 18 in accordance with the action characteristic of each knob 10. Then the means 12 obtains the drive characteristic based on the D0 function and the distance moved up to a target position and drives each knob 10. Thus, it is possible to correct the variance of action characteristics among plural knobs 10 and each knob 10 is stably actuated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to motor-driven knobs in a mixing console (audio adjustment console), etc., and the present invention corrects variations in the operating characteristics of a plurality of motor-driven knobs to improve the performance of each motor-driven knob. This allows the knob to operate stably.

[Conventional technology]

Mixing consoles are used in recording studios and the like to perform level adjustment, frequency equalization, and effects such as adding reverberation to line inputs of multiple channels.

Conventional mixing consoles have separate operators for each function: a fader operator for level adjustment, an equalizer setting operator for frequency equalization, and an effect setting operator for applying effects such as reverberation. For this reason, the number of operators is large, which increases the size of the device, and many operators are located far from the operator, making it difficult to operate.

Therefore, we proposed a mixing console that solves these drawbacks of conventional mixing consoles, allows the controllers to be used for various functions, and simplifies the configuration, making the device smaller and easier to operate. has been done.

As an example, the mixing console disclosed in Japanese Patent Application No. 1-267272 has a plurality of motor-driven knobs that can be operated by motor and manual operation, and various functions to be operated by these plurality of motor-driven knobs are selected. a function selection means, a memory means for storing the final operation position of the motor-driven knob for each of the functions, and reading operation position information stored in the memory means for the function selected by the function selection means; The apparatus includes motor control means for positioning each motor-driven knob at that position by driving the motor.

According to such a configuration, when a function is selected by the function selection means, the last operating position information stored in the memory means for the selected function is read out, and the motor-driven knob or motor The operator is once positioned at that position by driving, and then the position of the operator can be freely changed by moving the operator. Then, the selected function is processed by a signal processing means corresponding to the position of the motor-driven knob.

In the above configuration, a DC motor, for example, is used as the drive motor for the motor-driven knob, and as shown in FIG. 2, the frequency f is constant and the duty cycle PW, -f (%). A square wave voltage of 1-IJ is used. The motor is driven at the average level of this rectangular wave voltage, and increasing the duty cycle PW-f increases the operating speed, and conversely, decreasing the duty cycle decreases the operating speed.

In actual control, as shown in FIG. 2, the duty cycle PW-f decreases as it approaches the target position. This is to initially increase the duty cycle to quickly approach the target position, and to reduce the duty cycle near the target position to prevent overshoot.

Here, conventional drive control of a motor-driven knob using a rectangular wave voltage will be described. Now, consider a motor-driven knob (fader operator) 10 whose maximum movement distance is L, as shown in FIG. This motor-driven knob 10
FIG. 4 shows changes in the duty cycle of the driving rectangular wave voltage with respect to the moving distance from the start position to the target position when operating the motor. The contents of the six values in FIG. 4 are as follows.

D+eln: Minimum duty cycle required for motor-driven knob 10 to operate.

D5ino: Ds+In value at startup, which is larger than the Dsln value during movement due to friction etc.

Do: A value that is slightly larger than the Dmln value and is arbitrarily set as the final value of the duty cycle that can be stopped without overshooting when reaching the target position for various moving distances. The longer the travel distance, the faster the acceleration, so the value of DO is gradually set smaller.

Now, as shown in FIG. 3, if the motor-driven knob 10 is moved a distance fix from position a to position b, the DO value for the moving distance X is determined as shown in FIG. Using this DO value as the final value of the duty cycle immediately before reaching the 1st mark position, a change function DX of the duty cycle having a predetermined gradient is determined, and the motor is driven according to this function DX. position)
Start with the duty cycle DXO at and stop 1. let

Note that the function DL in FIG. 4 is the change in duty cycle when the motor-driven knob 10 is moved by the maximum travel distance.

In conventional mixing consoles, etc., the same driving function as shown in FIG. 4 is used for each of the plurality of motor-driven knobs.

[Problem to be solved by the invention]

Motor-driven knobs used in mixing consoles and the like have some variation in operating characteristics even if they are of the same design. In addition, changes in operating characteristics occur due to aging. For this reason, the D sin value becomes large, and in some cases, as shown in FIG. 5, the I) sin value may become larger than the set DO value. In such a case, the movable range of the motor-driven knob is limited to the shaded area in Figure 5, so the duty cycle at startup is less than the D+ainO value and the moving distance is 0 to Xo.
There was an inconvenience that the engine could not be started at all within this range, and although it would start over this range, it would stop short of the target position. In order to prevent such inconveniences, if the DO value is set to a large value with a margin, the moving speed becomes faster, and as shown in FIG. 6, there is a possibility that the moving speed will pass the target position and overshoot.

This invention solves the drawbacks in the conventional techniques, and
It is an object of the present invention to provide a motor control device for a motor-driven knob, which is capable of stably operating each knob by correcting variations in the operating characteristics of a plurality of motor-driven knobs.

[Means to solve the problem]

The present invention includes a plurality of motor-driven knobs and a motor control means for moving each of these motor-driven knobs to a target position, and the motor control means is configured to move each motor-driven knob as the motor-driven knob approaches the target position. The present invention is characterized in that the driving force is decreased as the motor drives the knobs, and the individual driving characteristics are adjusted in accordance with the variations in the operating characteristics of the respective motor-driven knobs in order to correct the variations.

[For production]

According to this invention, the motor control means does not drive each motor-driven knob with the same drive characteristic, but adjusts the individual drive characteristics to correct variations in the operating characteristics of each motor-driven knob. Adjust. Therefore, regardless of variations in the operating characteristics of each drive type knob, each of these can be stably moved to the target position.

The operating characteristics of each motor-driven knob can be measured in advance at the time of manufacture, or can be measured after manufacture using an external measuring means if necessary, or can be measured using a built-in measuring means. It is also possible to measure the motor-driven knob automatically or upon instruction from an operator prior to using the motor-driven knob.

[Embodiment] An embodiment in which the present invention is applied to a mixing console will be described below. Here, a case will be described in which driving is performed in the same manner as in FIG. 4 above.

FIG. 1 is a block diagram showing an embodiment of a motor control device for a motor-driven knob according to the present invention.

A motor-driven knob 1o is provided for each channel. Each motor-driven knob 1o is equipped with a drive motor and a position detector such as a pulse encoder, and a motor drive signal (a rectangular wave voltage as shown in FIG. 2) is applied to the motor by the motor control means 12, so that move in a specific manner. Manual operation is also possible. Motor-driven knob 1
The position of o is detected by a position detector and the motor control means 1
2 is input. In addition, this detected position information is sent to a signal processing circuit (not shown), and the selected function (level adjustment, frequency equalization, effect addition, etc.) is applied to the human audio signal according to the detected position. Performs signal processing.

The function selection means 14 selects each of the above functions.

The memory 16 includes each motor-driven knob 1 for each function.
The final operation position information of 0 (immediately before switching to another function) is stored. When a function is switched by the function selection means 14, the motor control means 12 reads information on the previous operation position of the corresponding function from the memory 16, and feedback-controls the position of the motor-driven knob 10 to this position. The DO child table is
Various functions are stored as a table. In addition, D
It is also possible to store the O function as a function itself rather than as a table. The motor control means 12 selects a DO function that matches the operating characteristics of each motor-driven knob, determines the drive characteristic from the movement distance to the target position according to the DO function, and drives each motor-driven knob]-〇. .

The timer 20 measures the operating characteristics of each motor-driven knob. The memory 22 stores each measurement value.

An example of the control flow by the motor control device in Fig. 1 is shown in Fig. 7.
As shown in the figure. When the function of the mixing console is switched to one of the functions using the motor-driven knobs 10, knob control is started, and first the total Dr of the operating characteristics of each motor-driven knob 10 is performed. In this measurement, first, the knob 10 is forcibly driven by a motor to the 0 position (lower limit position) (Pl). And timer 20
(P2), and a common measurement rectangular wave voltage is applied to the motor of each knob 10 (P3).At this time, the level frequency and duty of the measurement rectangular wave voltage are constant values, and all the knobs 10 are operated. The value shall be sufficient for When the eye position is reached, the timer 20 is stopped (P4), and the elapsed time is stored in the memory 22 (P5).

Next, the timer 20 is started again (P6), and the same H measurement rectangular wave voltage is applied to the motor of the knob 10, which is different only in polarity from the previous time, and the motor is moved in the opposite direction (Pl
). When it returns to the lower limit position, the timer 20 is stopped (P8). Then, from the time it took to complete the 11th turn, select 1.
0 (a DO function that can reach the 1" target position at any distance of travel and does not cause overshoot) from the DO child table 8 (P9)
.

In addition, the old 1lFI is performed by reciprocating the 0 position and L.
If there is a height difference between the positions (usually mixing consoles are often tilted forward), the travel time will be different between the 0 position and the L position → 0 position even if the same drive voltage is applied. This is because with jt ilF+, which is only one way, an appropriate duty cycle can only be set for one way. 3111 round trip? As a result of I, it is possible to control by setting a DO function that is suitable for either direction, or by setting an optimal O function for each one-way trip, it is possible to perform control in a round-trip manner.

The above control is performed for all the knobs 10 simultaneously or sequentially one by one to find DO functions suitable for each knob 10, respectively.

After completing the measurement of the operating characteristics above, actual movement control is performed. That is, the previous final operation position information for the selected function is read from the memory 16 and is set as the target value (Plo). Subsequently, current position information of the knob 10 is obtained from the position detector (pH). and,
The difference between these 1-1 target values and the current value is determined as the travel distance, and the drive characteristics (characteristics of drive voltage where the voltage level and frequency are constant and the duty cycle changes) are calculated from this and the selected DO function. (Pl3), and the knob 10 is moved in the direction of the target value according to the determined drive characteristic. When the target value is reached (Pl2), it stops. The above control is performed for each knob 10. In this way,
Once each knob 10 has been initialized to its last operating position, the position of each knob can be freely changed by manual operation.

An actual control example using the flow shown in FIG. 7 will be explained.

FIG. 8 shows the operation of each knob 10 when measuring operating characteristics. Here, it is a curved line because it is driven with a constant duty cycle or because there is a delay in the start-up due to friction or the like. The time required for the knob IOA and the knob 10B to reach the L position is different due to variations in operating characteristics. The knob IOX, which operated stably using the conventional control method, is set as the reference knob. Similarly, if the time when the reference knob 10X reaches the L position when the Ap1 fixed furnace rectangular wave voltage is activated is Tx, then the knob is 10A.

By operating the knobs IOA and IOB so as to reduce the differences Δta and Δtb from the arrival time of 10B, the knobs 10A and 10B can be stably operated in the same way as the reference knob 10X. In other words, from Figure 8, the knob IOA
The speed is faster compared to the standard Mami IOX, so
The DO function of the standard knob IOX should be smaller than that of the standard knob IOX, and since the speed of knob 1-OB is difficult to increase compared to the standard knob IOX,
Make it larger than the O function.

FIG. 9 shows each knob 10X in the above case.

1, OA, and IOB. The DO child table 8 stores various tables of O functions. These DO functions are the standard D
This value is larger than the 5hin value.

? 11 Each knob 10A according to the determined operating characteristics.

], an appropriate O function is set for each OB. The driving characteristics are then set according to the moving distance. The drive characteristics shown in Fig. 9 are for the case of moving the maximum travel distance, and the drive characteristics have a predetermined slope where the duty cycle immediately before reaching the target position is a value on the set DO function. Each knob 10X.

10A and IOB. In this case, in a portion where the duty cycle exceeds 100%, the duty cycle is fixed at 100% and driven. Even when the moving distance is other, the driving characteristics can be similarly set from the moving distance and the set DO function.

By setting the drive characteristics that match the operating characteristics of each knob as described above, regardless of the variations in operating characteristics,
Move each knob stably (that is, the target position can be reached reliably regardless of the moving distance, and the target position can be reached without overshooting)
be able to.

Further, according to the above embodiment, since the total ΔI+ means is built-in, the total n1 can be automatically calculated when switching to a function using the knob 10 (or the operator can sometimes
It is also possible to respond to changes in operating characteristics over time (for example, an increase in the D win value, etc.) by giving a measurement command and performing a total n1.

[Example of change]

In the above embodiment, a case is shown in which a measuring means for measuring operating characteristics is built-in, but instead of having a built-in means for measuring operating characteristics, it is possible to measure the operating characteristics externally in advance at the time of manufacture, or to install an external measuring means as necessary after manufacturing. It is also possible to perform measurement-1 by connecting.

Furthermore, although the above-mentioned embodiment shows the case of driving using the driving method as shown in FIG. 9, other various driving methods may also be used.

Further, in the above embodiment, the speed is controlled by the duty cycle, but the speed can also be controlled using a DC voltage as the driving voltage.

Further, in the above embodiment, the present invention is applied to a linearly movable knob, but it can also be applied to a rotary knob and various other motor-driven knobs.

Further, the present invention can be applied to various motor-driven knobs other than mixing consoles.

〔Effect of the invention〕

As explained above, according to the present invention, the individual drive characteristics are adjusted to correct variations in the operating characteristics of each motor-driven knob, so the operating characteristics of each motor-driven knob are adjusted. It is possible to stably move each of these to the target position regardless of variations in the position.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a waveform diagram showing a rectangular wave voltage for driving a motor with a variable duty cycle. FIG. 3 is a front view showing an example of a motor-driven knob. FIG. 4 is a diagram showing an example of the drive characteristics of a conventional motor-driven knob. FIG. 5 is a diagram showing a state in which a non-operating region occurs due to the drive characteristics of a conventional motor-driven knob. FIG. 6 is a diagram showing an overshoot state at the target position when the DO value is set too high. FIG. 7 is a flowchart showing an example of a control flow using the blocks of FIG. FIG. 8 is a diagram showing an example of the operation of the knob when measuring the operating characteristics in the flow of FIG. 7. FIG. 9 is a diagram showing an example of drive characteristics set according to the flow shown in FIG. 7. 1 0... Motor-driven knob, 2... Motor control means.

Claims (2)

[Claims] (1) A plurality of motor-driven knobs, and a motor control means for moving each of these motor-driven knobs to a target position, and the motor control means moves as each motor-driven knob approaches the target position. A motor control device for a motor-driven knob, characterized in that the drive force of each of the motor-driven knobs is reduced, and the drive characteristics of each of the motor-driven knobs are adjusted in accordance with variations in the operating characteristics of the motor-driven knobs in order to correct the variations. (2) It has a built-in measuring means for obtaining data regarding the operating characteristics of each motor-driven knob, and measures the operating characteristics by operating the motor of each motor-driven knob under the same conditions. A motor control device for a motor-driven knob according to claim 1.