JP2684808B2 - Motor control of motor-driven knob - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a motor-driven knob in a mixing console (sound control table) or the like, and corrects variations in operating characteristics of a plurality of motor-driven knobs, The knob can be operated stably.

[Conventional technology]

The mixing console is used in a recording studio or the like for level adjustment, frequency equalizing, effect addition such as reverberation, etc. for line inputs of a plurality of channels. In a conventional mixing console, a leveler is provided with a fader operator, a frequency equalizer is provided with an equalizer setting operator, and an effect imparting effect such as reverberation is provided with an effector setting operator and a separate operator for each function. For this reason, there are disadvantages that the number of operators is large, the device becomes large-sized, and the operators located at a position far from the operator become many, which makes it difficult to operate.

Therefore, by proposing a mixing console that solves the drawbacks of the conventional mixing console and allows the operator to be used for various functions, and the configuration is simplified, the device is downsized and the operation is facilitated. Has been done.

As an example, in the mixing console of Japanese Patent Application No. 1-267272, a plurality of motor-driven knobs that can be motor-driven and manually operated, and a function to select various functions operated by these motor-driven knobs Selecting means, memory means for storing a final operating position for each of the functions of the motor-driven knob; and operating position information stored in the memory means for the function selected by the function selecting means, And motor control means for positioning each motor-driven knob at a position by driving the motor.

According to such a configuration, when a function is selected by the function selecting means, the last operation position information up to the previous time stored in the memory means for the selected function is read out, and the motor-driven knob is operated by the motor. The actuator is once positioned at that position by driving, and then the position of the operator can be freely changed by manual operation. Then, the signal processing means performs signal processing corresponding to the position of the motor-driven knob for the selected function.

In the above configuration, for example, a DC motor is used as the drive motor of the motor-driven knob, and for driving the same, the frequency f is constant and the duty cycle PW · f (%) is variable, as shown in FIG. Square wave voltage 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 the actual control, as shown in FIG. 2, the duty cycle PW · f decreases as it approaches the target position. This is to increase the duty cycle at the beginning so as to approach the target position immediately and to reduce the duty cycle near the target position to prevent overshoot.

Here, the conventional drive control of the motor drive type knob by the rectangular wave voltage will be described. Now, consider a motor-driven knob (fader operator) 10 having a maximum movement distance L as shown in FIG. 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-driven knob 10. The contents of each value in FIG. 4 are as follows.

Dmin: The minimum value of the duty cycle required for the motorized knob 10 to operate.

Dmin0: Dmin value at startup, Dm in operation due to friction etc.
The value is larger than the in value.

D0: A value that is slightly larger than the Dmin value and is arbitrarily set as the final value of the duty cycle that can be stopped without overshooting when the target position is reached for various movement distances. The value of D0 is set to be gradually smaller because the acceleration is accelerated as the moving distance becomes longer.

Now, assuming that the motor-driven knob 10 is moved a distance x from the position a to the position b as shown in FIG. 3, the D0 value for the moving distance x is obtained as shown in FIG. With the D0 value as the final value of the duty cycle immediately before reaching the target position b, a duty cycle change function Dx having a predetermined gradient is obtained, and the motor is driven according to this function Dx. That is, the duty cycle Dx0 is started at the position a (position 0), and the function Dx
Gradually decrease the duty cycle according to
Immediately before the target position b, the duty cycle is reduced to D0, and when the target position is reached, the duty cycle is set to 0% and stopped.

The function DL in FIG. 4 is the change in the duty cycle when the motor-driven knob 10 is moved by the maximum moving distance L.

In a conventional mixing console or the like, a plurality of motor drive type knobs have the same drive function as shown in FIG. 4 for each knob.

[Problems to be solved by the invention]

Motor-operated knobs used in mixing consoles and the like have some variations in operating characteristics even if they have the same design. In addition, changes in operating characteristics also occur over time. For this reason, the Dmin value becomes large, and in some cases, the Dmin value becomes larger than the set D0 value, as shown in FIG. In such a case,
Since the movable range of the motor-driven knob is limited to the shaded area in Fig. 5, the duty cycle at startup is Dmi.
If the moving distance smaller than the n0 value is in the range of ₀ to x0, the engine cannot be started at all, and even if it is in the range of more than that, the vehicle starts, but stops before the target position. In order to prevent such inconvenience, if the D0 value is set to a large value with a margin, the moving speed becomes high, and as shown in FIG. 6, the target position may be exceeded and overshoot may occur.

The present invention solves the above-mentioned drawbacks of the prior art, corrects variations in operating characteristics of a plurality of motor-driven knobs, and provides a motor control device for a motor-driven knob that can stably operate each knob. It is the one we are trying to provide.

[Means for solving the problem]

The present invention comprises a plurality of motor-driven knobs, and motor control means for moving each of these motor-driven knobs to the instructed target position. A drive signal of each motor drive type knob is output based on a drive signal characteristic set for each of the motor drive type knobs, which has a characteristic that the drive force is reduced as it approaches the target position according to the distance. And, the motor control means has a function of setting the drive signal characteristics of each of the motor driven knobs to be changeable, and the function is that each of the knobs of the motor driven knobs is set based on a command to start measurement of operating characteristics. A common predetermined drive signal for measurement is applied to drive, and the operating characteristics of the motor-driven knob at that time are measured by the measuring means,
It is characterized in that a drive signal characteristic with which a predetermined operation characteristic is obtained based on the measurement result is set for the motor drive type knob.

[Action]

According to the present invention, the motor control means does not drive each motor drive type knob with the same drive characteristic, but according to the variation in the operating characteristic of each motor drive type knob, the individual drive characteristic should be corrected. Adjust. Therefore, irrespective of variations in the operating characteristics of the drive type knobs, these can be stably moved to the target positions.

Further, the motor control means drives the motor drive type knob by giving a predetermined measurement drive signal common to each knob to the motor drive type knob on the basis of the command to start the operation characteristic measurement, and measures the operation characteristic of the motor drive type knob at that time By setting the drive signal characteristics for the motor drive type knobs, the drive signal characteristics for each motor drive type knob can be set to be changeable. Therefore, when the operating characteristic changes due to a change over time, the original correct operating characteristic can be corrected by changing the drive signal characteristic by this function. The operation characteristics can be measured automatically before using the motor-driven knob, or by an operator's instruction.

〔Example〕

An embodiment in which the present invention is applied to a mixing console will be described below. Here, a case of driving by the same method as in FIG. 4 will be described.

FIG. 1 is a block diagram showing an embodiment of a motor control device for a motor drive type knob according to the present invention. The motor-driven knob 10 is provided for each channel. Each motor-driven knob 10 has a drive motor and a position detector such as a pulse encoder, and a motor drive signal (rectangular wave voltage as shown in FIG. 2) is given to the motor from the motor control means 12 to make a straight line. Move. Also, manual operation is possible. The position of the motor-driven knob 10 is detected by the position detector and input to the motor control means 12. Further, this detected position information is sent to a signal processing circuit (not shown), and the selected position (level adjustment, frequency equalizing, effect addition, etc.) is determined according to the detected position with respect to the input audio signal. Performs signal processing.

The function selecting means 14 selects each of the above functions. memory
The final operation position information (immediately before switching to another function) of each motor-driven knob 10 is stored in 16 for each function. When the function is switched by the function selection means 14, the motor control means 12 reads the information of the operation position up to the last time for the corresponding function from the memory 16 and feedback-controls the position of the motor-driven knob 10 to this position. The various functions of D0 are stored in the D0 table as a table. The D0 function may be stored as a function itself instead of a table. The motor control means 12 selects a D0 function that suits the operating characteristics of each motor-driven knob, obtains the driving characteristic from the moving distance to the target position according to this, and then determines each motor-driven knob.
Drive 10

The timer 20 measures the operating characteristics of each motor-driven knob, and corresponds to measuring means. The memory 22 stores each measured value.

FIG. 7 shows an example of a control flow by the motor control device of FIG. When the function of the mixing console is switched to one of the functions using the motor-driven knob 10, the knob control is started, and the operation characteristic of each motor-driven knob 10 is first measured. In this measurement, first, the knob 10 is forcibly driven by the motor to the 0 position (lower limit position) (P1). Then, the timer 20 is started (P2), and at the same time, a common rectangular wave voltage for measurement is applied to the motor of each knob 10 (P3). At this time, the level frequency and duty of the rectangular wave voltage for measurement are constant values, which are sufficient values for operating all the knobs 10. When the knob 10 reaches the upper limit position, the timer 20 is stopped (P4) and the time taken is stored in the memory 22 (P5).

Then, the timer 20 is started again (P6), and the same rectangular wave voltage for measurement as the previous time, which is different in polarity only, is applied to the motor of the knob 10 to move it in the opposite direction (P7). After returning to the lower limit position, stop timer 20 (P8).
And from the time it took to make a round trip, D0 that matched knob 10
The function (D0 function that can reach the target position at any moving distance and does not cause overshoot) is D0
Select from Table 18 (P9).

The reciprocating motion is measured when there is a difference in height between the 0 position and the L position (usually the mixing console is tilted forward in many cases), the 0 position → L position and the L position → 0.
This is because the movement time differs from the position even if the same drive voltage is applied, so that an appropriate duty cycle can be set only for one way in the measurement of only one way. As a result of the round trip measurement, it is possible to set and control a D0 function that is suitable for any direction, or to set an optimal D0 function for each one-way and separately control the round trip.

The above control is performed for all the knobs 10 simultaneously or sequentially one by one to obtain the D0 function suitable for each knob 10.

When the measurement of the operation characteristics is completed as described above, the actual movement control is performed. That is, the last final operation position information for the selected function is read from the memory 16 and set as the target value (P10). Then, the current position information of the knob 10 is obtained from the position detector (P11). Then, the difference between the target value and the current value is obtained as a moving distance, and from this and the selected D0 function, the drive characteristic (voltage level,
The characteristic of the driving voltage at which the frequency is constant and the duty cycle changes) is obtained (P13), and the knob 10 is moved in the direction of the target value according to the obtained driving characteristic. When the target value is reached (P12), stop. The above control is performed for each knob 10. In this way, when each knob 10 is initialized to the final operation position up to the previous time, the position of each knob can be freely changed by manual operation.

An actual control example according to the flow of FIG. 7 will be described. FIG. 8 shows the operation of each knob 10 when measuring the operation characteristics. Here, the driving is performed with a constant duty cycle, but the curve is curved because the rising is delayed due to friction or the like. That is, 10A and knob 10B have different times to reach the L position due to variations in operating characteristics. Knob 10X that worked stably with the conventional control method
Is the reference knob. Letting Tx be the time when the reference knob 10X reaches the L position when driven with the same rectangular wave voltage for measurement, operate the knobs 10A and 10B so as to reduce the difference Δta, Δtb with the arrival time of the knobs 10A and 10B. Thus, the knobs 10A and 10B can be stably operated as well as the reference knob 10X. In other words, the knob 10A from FIG. 8 is the reference knob 1
Since the speed is faster than 0X, the D0 function should be smaller than the standard knob 10X D0 function. Knob 10B
Compared with the standard knob 10X, the speed is harder to attach, so
It is made larger than the D0 function of the standard knob 10X.

FIG. 9 shows the knobs 10X, 10A, 10B in the above case.
3 shows an example of drive characteristics set to. Said D
The table 0 stores various D0 function tables. These D0 functions are larger than the standard Dmin value. An appropriate D0 function is set for each knob 10A, 10B according to the measured operating characteristics. Then, the drive characteristic is set according to the moving distance. The drive characteristics shown in FIG. 9 are for moving the maximum movement distance L, and the drive characteristics with a predetermined gradient are such that the duty cycle immediately before reaching the target position L is a value on the set D0 function. Knob 1
It is set for 0X, 10A, and 10B. In this case, if the duty cycle exceeds 100%, the drive is fixed at 100%. Similarly, when the moving distance is other than the above, the drive characteristic can be set from the D0 function set as the moving distance.

By setting the drive characteristics that match the operating characteristics of each knob as described above, the knobs can be moved stably regardless of variations in the operating characteristics (that is, the target position for any moving distance). Can be reliably reached, and the target position can be reached without overshooting). Further, according to the above-mentioned embodiment, since the measuring means is built-in, by automatically measuring when the knob 10 is switched to the function to be used (or by the operator sometimes giving a measurement command to perform measurement, etc. ), It is also possible to deal with changes over time in operating characteristics (for example, an increase in the Dmin value).

[Modification example]

In the embodiment, the case of driving using the driving method as shown in FIG. 9 has been described, but other various driving methods can be used.

Further, in the above-described embodiment, the case where the speed is controlled by the duty cycle has been described, but the speed can be controlled at the voltage level by using the DC voltage as the drive voltage.

Further, in the above embodiment, the case where the present invention is applied to the linear movement type knob is shown, but the present invention can be applied to the rotary type knob and other various motor drive type knobs.

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

〔The invention's effect〕

As described above, according to the present invention, the individual drive characteristics are adjusted in order to correct the variations in the operation characteristics of the motor-driven knobs. Therefore, the operation characteristics of each drive-type knob are adjusted. Irrespective of the variation of the above, each of them can be stably moved to the target position, and it is possible to deal with the change of the operating characteristics due to the change over time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a waveform diagram showing a motor drive rectangular wave voltage with a variable duty cycle. FIG. 3 is a front view showing an example of the motor-driven knob. FIG. 4 is a diagram showing an example of drive characteristics of a conventional motor-driven knob. FIG. 5 is a diagram showing a state in which a non-operation area is generated 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 D0 value is set excessively. FIG. 7 is a flow chart showing an example of the control flow by the blocks of FIG. FIG. 8 is a diagram showing an example of the operation of the knob when measuring the operation characteristics in the flow of FIG. FIG. 9 is a diagram showing an example of drive characteristics set by the flow of FIG. 7. 10 …… Motor-driven knob, 12 …… Motor control means, 20
...... Timer (measuring means).

Claims (1)

(57) [Claims] 1. A plurality of motor-driven knobs, and motor control means for moving each of these motor-driven knobs to a designated target position. The motor control means includes a target position and a current position. The drive signal of each motor drive type knob is output based on the drive signal characteristic set for each of the motor drive type knobs, which has a characteristic of reducing the drive force as the distance approaches the target position. And the motor control means has a function of setting the drive signal characteristics of each of the motor-driven knobs to be changeable, and the function controls each of the motor-driven knobs based on a command to start measuring an operation characteristic. It is driven by giving a predetermined measurement drive signal common to the knobs, the operating characteristics of the motor-driven knob at that time are measured by the measuring means, and based on the measurement results. It can motorized knob of the motor control apparatus in which a driving signal characteristics predetermined operating characteristic is obtained to set for the motor-driven knob.