JPH0520012Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic adjustment device that automatically performs peak adjustment or level adjustment of an output signal of, for example, audio equipment.

[Prior art] For example, peak adjustment is automatically performed to adjust the output signal level of audio equipment to the maximum, or level adjustment is automatically performed to adjust the output signal to a predetermined level value. In this case, an automatic adjustment device as shown in FIG. 2 is used.

In Fig. 2, 1 is a device to be adjusted such as an audio device, 2 is an A/D converter that samples the analog output signal of the device to be adjusted 1 and converts it from analog to digital, and 3 is a signal from the A/D converter 2. A control circuit with a built-in microcomputer that calculates output data and performs adjustment control such as peak adjustment and level adjustment; 4 is an adjustment element that is operated by the output signal from the control circuit 3 to adjust the volume of the device 1 to be adjusted; This is an adjustment unit that adjusts the amount using a motor-driven driver.

To explain the operation of this automatic adjustment device, the adjustment unit 4 gradually adjusts the adjustment elements of the device 1 to be adjusted, and the A/D converter 2 samples the output signal from the device 1 to be adjusted and converts it from analog to digital. The signal is taken into the control circuit 3 via. Then, a peak value or a desired level value is detected from the output signal data, and the adjustment unit 4 adjusts the device 1 to be adjusted to that value.

[Problem that the invention attempts to solve]

For example, when performing peak adjustment as shown in Figure 8, the adjustment should originally be made at the peak point P1 of the output characteristics, but because noise was introduced during the adjustment, the peak point P2 of the noise was changed. There is a possibility that the user may erroneously judge that it is the desired adjustment point and adjust the device 1 to be adjusted to that point.

Conventionally, in order to prevent such erroneous adjustments, output data is sampled, for example, five times near the same sampling point, and the maximum and minimum values that may cause erroneous measurements are removed, and the remaining three output data are sampled. In this method, the average value is used as the output data at that time, but in this case, the calculation process to calculate the average value takes time, so the interval (sampling period) until the next data is sampled is ) becomes longer. For this reason, the adjustment element of the device to be adjusted 1 cannot be changed (turned) quickly, so the time required for adjustment becomes longer.

[Means for solving problems]

FIG. 1 is a functional block diagram of an automatic adjustment device according to the present invention.

The automatic adjustment device according to the present invention includes a device to be adjusted 1
sampling means 11 for sampling the adjusted output of 0; differential coefficient calculating means 13 for calculating the differential coefficient from the adjusted output sampled by the sampling means 11;
Adjustment means 1 that automatically adjusts the device to be adjusted 10 when the differential coefficient calculated in sequentially changes from one of positive or negative to zero and then to the other.
2. When the differential coefficient calculated by the differential coefficient calculating means 13 changes instantaneously from one of positive or negative to the other without passing through zero, or when the absolute value of the differential coefficient exceeds a predetermined value; or in both cases, noise detection means 14 detects noise superimposed on the output to be adjusted, and when noise is detected by the noise detection means 14, the adjustment by the adjustment means 12 is invalidated. It is equipped with invalidation means 15.

[Effect]

Sampling means 11 for the output of the device to be adjusted 10
After sampling, the means 13 calculates the differential coefficient, and the adjusting means 12 adjusts it to a peak value or a desired level value. At this time, means 13
The device to be adjusted 10 based on the differential coefficient calculated in
The noise superimposed on the output is detected by the noise detection means 14. If noise is detected, adjustment means 1
The adjustment by No. 2 is invalidated by a nullifying means 15 to prevent erroneous adjustment from occurring.

The noise detection method in the noise detection means 14 will be explained below. First, in the case of peak adjustment, the output level changes near the peak value of the output signal of the device 10 to be adjusted as shown in FIG.
In this case, when we find the differential coefficient f'(x) of this output signal, we find that the differential coefficient f'(x) changes sequentially from positive to zero to negative according to the output characteristic curve. I understand that. On the other hand, when noise is superimposed on the output signal, as shown in Figure 4, the absolute value of the differential coefficient f'(x) of this noise part is large, and its sign suddenly changes from positive to negative. There is no point where it changes to zero. Therefore, by detecting that the differential coefficient f'(x) suddenly changes from positive to negative without passing through zero, or by detecting that the absolute value of the differential coefficient f'(x) exceeds a certain constant value. By detecting that
Furthermore, it is possible to detect noise superimposed on the output signal using both of them.

In the case of level adjustment, as shown in FIG. 5, the device 10 to be adjusted is adjusted to gradually increase its output level, and when the desired adjustment point P3 is reached, the adjustment is finished. , unless the direction of adjustment of the adjustment element of the device to be adjusted, for example, the direction of rotation of the volume, etc., is reversed, the direction of output change is the same, that is, the sign of the differential coefficient f'(x) is the same. On the other hand, when noise is superimposed, the differential coefficient f'(x) also takes a negative value, as shown in FIG. This makes it possible to detect noise superimposed on the output signal.

〔Example〕

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

FIG. 2 is a schematic block diagram of the automatic adjustment device.

In Fig. 2, 1 is a device to be adjusted such as an audio device, 2 is an A/D converter that samples the analog output signal of the device to be adjusted 1 and converts it from analog to digital, and 3 is from the A/D converter 2. captures the output signal data and detects the peak value etc.
A control circuit 4 has a built-in microcomputer that performs adjustment control such as peak adjustment and level adjustment, and 4 is an adjustment that is activated by the output signal from the control circuit 3 to adjust the volume, etc. of the device to be adjusted 1 using a motor-driven driver. It is a unit.

The case where peak adjustment is performed using this automatic adjustment device will be described below with reference to FIG. 7. FIG. 7 is a flowchart showing the procedure of peak adjustment performed in the control circuit of FIG. 2. The output signal data from the device to be adjusted 1 is
It is input into the control circuit 3 via the converter 2 (step S3), and its differential coefficient f'(x) is calculated (step S3).
S4). If the differential coefficient f'(x) is continuously positive, the output signal is increasing continuously, and it can be determined that this is the section of the output characteristics shown in Figure 3. A flag is set to notify that fact (step S5, S6), capture the output signal again.

If the differential coefficient f'(x) is not positive, it is determined whether it is zero (step S7), and if it is zero, it is determined whether it becomes zero after being positive (step S8). If the differential coefficient f'(x) changes from positive to zero, it can be determined that the point is in the section shown in Figure 3 and is the peak point of the output characteristics, and the output value at that time can be determined as follows: Save as peak value (step
S9).

If the differential coefficient f'(x) does not change from positive to zero, it is possible that the adjustment is being made in a flat area of the output characteristics, and therefore, the adjustment driver may be turned off at the point where the output characteristic remains zero for more than 1 second. Reverse the drive motor (step
S10), if the zero value continues for 2 seconds or more, it is determined that normal adjustment is not possible and the adjustment is stopped (step S11).

If the differential coefficient f'(x) is neither positive nor zero, it can be determined that it is negative, and in this case, it is determined whether the differential coefficient f'(x) has gone from positive to zero and becomes negative. That is, with the output characteristics shown in FIG. 3, it is determined whether the output level increases, passes through the peak value area, and then reaches the output level decrease area. When the output level goes from positive to zero and becomes negative, it is necessary to return to the peak value interval in order to adjust to the peak value, so the adjustment driver is driven when the output level reaches 70% of the previously memorized peak value. Reverse the motor (step S13),
Then, the rotation speed is reduced for fine adjustment (step S14). Then, the output level is forcibly returned to equal to the peak value, the motor is stopped, and the peak adjustment is completed.

If the differential coefficient f'(x) has not changed from positive to negative through zero, it is determined whether it has suddenly changed from positive to negative (step S17). If so,
It can be determined that the captured output data is from a portion where noise is superimposed on the output signal, and the output data near that sampling point cannot be used for adjustment, so the data is treated as invalid (step S18). The device to be adjusted 10 is prevented from being adjusted by this noise output data.

[Effect of idea]

According to the present invention, it is possible to accurately detect the superimposition of noise on the output signal and prevent erroneous adjustment at the noise point, and the time required for adjustment is also reduced compared to the conventional method for making multiple adjustments near the same sampling point. This can be shortened compared to the method that required multiple samplings.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the automatic adjustment device according to the present invention, FIG. 2 is a schematic block diagram showing the automatic adjustment device, and FIGS. 3 to 6 are for explaining the noise detection method using the device of the present invention. , Figure 7 is the second
FIG. 8 is a flowchart showing the procedure of peak adjustment carried out by the control circuit 3 shown in the figure, and is a diagram for explaining the conventional problems. 1... Equipment to be adjusted, 2... A/D converter, 3...
... Control circuit, 4 ... Adjustment unit, 11 ... Sampling means, 12 ... Adjustment means, 13 ... Differential coefficient calculation means, 14 ... Noise detection means, 15 ...
Ineffective means.

Claims (1)

[Scope of Claim for Utility Model Registration] Sampling means for sampling the adjusted output of a device to be adjusted, differential coefficient calculation means for calculating the differential coefficient from the adjusted output sampled by the sampling means, calculation by the differential coefficient calculation means adjusting means for automatically adjusting the device to be adjusted when the differential coefficient calculated sequentially changes from one of positive or negative to the other through zero; If the negative value changes instantaneously from one to the other without passing through zero, or if the absolute value of the differential coefficient exceeds a predetermined value, or in both cases, the noise superimposed on the adjusted output is An automatic adjustment device comprising: noise detection means for detecting noise; and invalidation means for invalidating adjustment by the adjustment means when noise is detected by the noise detection means.