JPH01245709A - Sound volume adjusting device - Google Patents

Abstract

PURPOSE:To prevent danger attended with continuous operation of an operating button of an electronic volume due to carelessness by detecting the operating state of the operating button of the electronic volume and stopping the control of the electronic volume when the count reaches a reference value in the count of a clock signal during the duration period of the detected output in case of the consecutive operation. CONSTITUTION:If the switch 2 is depressed continuously, a pulse signal having a width corresponding to the depressing time is generated by an operating state detection circuit 3. The signal is fed to an AND circuit 4. Then a clock signal is fed via the AND circuit 4 to the counter 6, where the signal is counted. A comparator 7 compares the count of the counter 6 with a reference value RV. When the count reaches the reference value RV, a flip-flop circuit 8 is set and a high level output signal is obtained at the output side. A transistor(TR) 9 is turned on by the output signal to connect the input side of a control circuit 10. Thus, the control circuit 10 is inactivated and the sound volume in this case is kept to a sound volume corresponding to the reference value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a volume control device suitable for use in a sound reproduction device etc. having an electronically controlled volume control device (hereinafter referred to as an electronic volume). .

[Summary of the invention]

This invention detects the operating state of whether or not an electronic volume control button is operated continuously, and if the operation is continuous, the count value is determined when the clock signal is counted during the duration of the detection output. By stopping the control of the electronic volume when the standard value corresponding to the predetermined volume is reached, it prevents the volume from reaching the maximum volume suddenly due to continuous operation of the electronic volume control button due to inadvertent operation, and prevents the danger associated with this. It is designed to prevent sex.

(Prior Art) Various volume control devices using electronic volume have been proposed in the past (for example, Japanese Patent Application Laid-open No. 173208/1983).
.

A volume control device using such an electronic volume, including an infrared remote controller, can continuously increase or decrease the volume by continuously pressing the operation button.

[Problem to be solved by the invention]

However, the sound WfJM using such an electronic volume
In the case of a volume control device, since the volume can be increased or decreased by simply pressing the operation button, there is a problem in that the volume can change irregularly due to continuous operation (continuation of pressing) due to inadvertence. Therefore, there is no special rule for decreasing the volume, but there is a possibility that the volume will suddenly become louder when increasing the volume.When such a situation occurs, for example, while driving a car, It is extremely dangerous to be surprised by a loud noise and make a mistake when driving.

This invention was made in view of this point, and can prevent the volume from suddenly reaching the maximum level due to continuous operation of the electronic volume control button due to inadvertent operation, thereby preventing the danger associated with this. A volume control device is provided.

[Means to solve the problem]

The prime adjustment device according to the present invention includes an electronically controllable volume adjuster (1), a detection means (3) for detecting the operation state of the operation button (2) of the volume control device, and an output of the detection means. Outputs 1 cock signal during signal duration 1:V
The clock signals from the clock generation means (4, 5) and the clock generation means (11) are counted and the reference value)? Comparing means (6, 7>) for comparing with V, flip-flop means (8) whose logic state is set by the output signal of this comparing means and the output signal of the detecting means, and a 1 for the output signal of this flip-flop means. control means (9,
10), and when the count value of the comparing means reaches the reference value by continuously operating the operation button, the control of the sound N adjuster is stopped.

(Operation) The detection means (3) detects the operating state of the FF fine regulator (operation switch 2 of 11), that is, whether the operation button is pressed continuously or intermittently, and detects whether the operation button is pressed. The clock generating means (4, 5) generates a pulse signal according to the time length of the
), the pulse signal from the detection means is used as a gate signal to output a signal from the clock generator (5). The comparison means (6, 7) sequentially counts the supplied clock signals, compares the counted value with the reference value RV, and if it is less than the reference value, generates a high level (H), for example, and indicates that the reference value has been reached. Then, for example, a low level (L) is generated. The logic state of the flip-flop means (8) is set depending on the level of the output signal of the comparison means and the output signal of the detection means. When the level of the output signal of the flip-flop means is, for example, a low level (L), that is, when the operation button is continuously operated and the count value of the comparison means does not reach the reference value, the control means (9, 10) Transistor (9
) is turned off, the control means is energized by the output of the counter (6) of the comparison means, and controls the volume controller (11).On the other hand, when the level of the output signal of the flip-flop means is, for example, a high level (L), That is, when the count value of the comparison means reaches the base V$ value by continuously operating the operation button, the transistor (9) at (9, 10) of the control means is turned on, and the control means receives the signal of the comparison means. The output of the counter (6) is not supplied (i.e., the control means is de-energized, so the control of the volume control is stopped. In other words, even if the operation button is operated continuously, the volume will not reach the maximum). Therefore, even if the operation button is pressed continuously inadvertently, the volume will not suddenly reach the maximum, and for example, in a car. This prevents the risk of being surprised by the maximum volume while driving and making a mistake in operation.

〔Example〕

An embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 shows the circuit configuration of this embodiment, in which (1) is an electronic volume, (2) is an operation button switch for operating this electronic volume (1), and (3) is an operation button switch for operating this electronic volume (1). The operating state detection circuit (2) detects the operating state of the switch (2), and this detection circuit (3) generates a pulse signal corresponding to the operating state of the switch (2). That is, the detection circuit (3) intermittently generates a short-duration pulse signal when the switch (2) is intermittently pressed, and generates a long-duration pulse signal when the switch (2) is continuously pressed. Occurs continuously.

(4) is a gate circuit such as an AND circuit; (5) is a clock generator; the output signal of the operation state detection circuit (3) is supplied as a gate signal to one input terminal of the AND circuit (4); While the gate signal is supplied to the AND circuit (4), the gate listens to the clock signal from the clock generator (5) and is counted by the counter (6).

(7) is a comparator that generates an output signal by comparing the count value of the counter (6) and the reference value RV.
) generates, for example, a high level (H) output signal on its output side when the count value of the counter (6) does not reach the reference value RV, and when the count value of the counter (6) reaches the reference value RV. For example, it generates a low level (L) output signal, and becomes high rail after a predetermined time. (8) is a flip-flop circuit consisting of, for example, two NAND circuits, and the output signal of the comparator (7) is supplied to the cent terminal S as a set signal, and the reset terminal is directly connected to the output of the operation state detection circuit (3). A signal is provided as a reset signal.

The flip-flop circuit (8) operates according to the truth table shown in Table 1 below.

Table 1 Truth table, that is, the flip-flop circuit (8) has the cent terminal S
and reset terminal R are set to low level (when the reset signal of It and high rail is supplied, a high level output signal is generated at the output terminal Q, and vice versa)
- When a high-level cent signal and a low-level reset signal are supplied to the terminal S and the reset terminal R, respectively, a low-level output signal is generated at the output terminal Q. In other words, when the switch (2) is intermittently pressed, the flip-flop circuit (8) resets the level of the reset terminal R each time by the pulse signal intermittently output from the operation state detection circuit (3). When a low-level output signal is generated at the output terminal Q and the switcher (2) is continuously pressed, the clock generator (5) is triggered by the pulse signal continuously output from the operating state detection circuit (3). When the counter value of the counter (6), which counts the clock signals of Generates an output signal. In order to reset the high level state of the output signal of the flip-flop (8), the operation button switch (2) may be released from being pressed.

In addition, the flip-flop circuit (8) keeps the count of the counter (6) when both the signals supplied to the set terminal S and the reset terminal R are at high level, that is, when the switch (2) is continuously pressed. When the value has not reached the reference value RV, the level of the output terminal Q remains at the previous level. Of course, when the signals supplied to the set terminal S and the reset terminal R of the flip-flop circuit (8) are at low level, the level of the output terminal Q is in an undefined state, so it is not listed in the truth table of Table 1. Not yet.

(9) is a transistor that is turned on and off by the output signal of the flip-flop circuit (8), and (10) is a control that is energized by the output signal of the counter (6) to control the electronic volume (1). It is a circuit.

The collector-emitter path of the transistor (9) is connected between the input side of the control circuit (10) and ground, and when the output signal of the flip-flop circuit (8) is at a low level, it is turned off and the output signal of the counter (6) is turned off. is supplied to the control circuit (10) so that the electronic volume (1) can be controlled.
When the output signal of the flip-flop circuit (8) is at a high level, it is turned on and the input terminal of the control circuit (1o) is grounded to prevent the output signal of the counter (6) from being supplied to the control circuit (10). The control circuit (10) is then deenergized and the electronic volume (1) cannot be controlled.

Next, the operation of the circuit shown in FIG. 1 will be explained. First, when the operation button switch (2) is pressed intermittently, the operation state detection circuit (3)
) intermittently generates a pulse signal, and this pulse signal is supplied as a reset signal to the reset terminal R of the flip-flop circuit (8), and is also supplied as a gate signal to the AND circuit (4), and is supplied to the clock generator (5). ) is sent to the counter (6) via the AND circuit (4).
) and counted.

The comparator (7) compares the counter value of the counter (6) with the reference value R.
When the count value reaches the reference value RV, a low level signal is generated on the output side, and after a predetermined time, it becomes high level. However, when the switch (2) is pressed intermittently, the pulse signal ( It is reset every time by the transistor (reset signal), but the level of its output terminal Q is actually low level, so the transistor (
9) is also in the off state, so the electronic holium (1) will increase its volume by one step each time the switch (2) is pressed until it reaches the maximum. This switch (
The operation in which 2) is pressed intermittently has been done in the past.

Now, what should be noted about this embodiment is that when the switch (2) is pressed continuously, the volume does not go up to the maximum all at once, but can be stopped at a volume that is just a few steps above the reference value. That is, when the switch (2) is pressed continuously, the operation state detection circuit (3) generates a pulse signal with a length corresponding to the pressing time, and this is used as a reset signal to send to the center terminal of the flip-flop circuit (8). It is supplied to the AND circuit (4) as a gate signal. When the AND circuit (4) opens the gate in response to the gate signal, the clock signal from the clock generator (5) is supplied to the counter (6) via the AND circuit (4) and counted.

The comparator (7) compares the counter value of the counter (6) with the reference value R.
V and the electronic volume (11) is controlled one step at a time until the count value reaches the reference value RV, and the volume increases by one step in the same way as when pressing intermittently.

■1 On the other hand, when the count value reaches the reference value RV, the comparator (7)
generates a low level output signal on its output side, which sets the flip-flop circuit (8) and provides a high level output signal on its output side.

This high-level output signal turns on the transistor (9) and grounds the input side of the control circuit (10). Therefore, the count value of the counter (6) is not supplied to the control circuit (1O), so the control circuit (10) is not supplied with the count value of the counter (6). 10) is deenergized and the electronic volume ill is not controlled in any way. In other words, the volume at this time remains maintained at the volume corresponding to the reference value.

If the switch (2) is released from the press at this point, the flip-flop circuit (8) is reset.

Then, if you continue to press switch (2), Free 7
A high-level signal is supplied to both the set terminal S and the reset terminal R of the flip-flop circuit (8), and in this state, the flip-flop circuit (8) maintains the previous state, that is, the output terminal Q has a low-level signal. is held and transistor (9) is off, so the electronic volume fl)
For example, the control circuit (10) controls the volume one step at a time, and finally the volume can be maximized.

Figure 2 is a flowchart schematically showing the above-mentioned operation, in which the operation starts in step (a), and the operation state detection circuit detects whether or not the operation button switch (2) has been pressed in step (b). It is detected in (3), and if it is not pressed, it waits until it is pressed, and if it is pressed, it proceeds to step (c) and controls the electronic volume (1) to increase the volume by one step.

Next, in step (c), the counter (
Compare the count value in 6) with the reference value RV, and if they are not equal, in step (e), the operation state detection circuit (3) detects whether or not the operation button switch (2) is being pressed continuously, and it must be kept pressed. In other words, if it is an intermittent press, the process advances to step (-\) and ends.

That is, when the switch (2) is pressed intermittently, the electronic volume (1) can be raised to the maximum volume by repeating steps (a) to (f) and controlling the electronic volume (1) for each step.

If the switch (2) is kept pressed in step (e), the process returns to step (c) and controls the electronic volume (1) to increase the volume by one step. and step again (
In (d), the count value of the counter (6) is compared with the reference value RV in the comparator (7), and if they are not equal, repeat steps (e) and (c) in the same manner as described above, and if they are equal, that is, the reference value When the volume corresponding to the value RV starts to come out, proceed to step (g) and disable the number of ships operation button switch (2). In other words, even if the operation button is kept pressed, the volume is maintained at the volume corresponding to the reference value RV and will not change thereafter.

When the count value of the counter (6) reaches the reference value RV, the flip-flop circuit (8) is reset by releasing the switch (2), and when the switch (2) is kept pressed again, the step ( In 2), the count value of the counter (6) becomes larger than the reference value RV, so the operation repeats steps (d) - (e) = (e) - (d) until the volume reaches its maximum. switch (2
), you will see that the operation button switch (2) is not pressed continuously in step (E), so step (
to) ends.

In this way, in this embodiment, even if the operation button switch (2) is pressed continuously, the count value of the counter (6) does not reach the reference value RV.
Since the control of the electronic volume (1) is stopped when the volume reaches the maximum level, the volume does not reach the maximum all at once.
There is no possibility that a loud volume will be output unexpectedly, and the danger associated with this is prevented.

In addition, it was possible to set the specified output level by mechanically providing a center click with a volume control, etc.
Since it is generally impossible to attach a mechanical link to an electronic volume, the specified output level had to be maximized when setting the volume in the system. The output level etc. may be set to a volume that stops when the button is pressed continuously, and thus the center click function as described above can be provided.

(Effects of the Invention) As described above, according to the present invention, the control of the electronic volume is stopped when the count value of the comparing means reaches the reference value by continuously operating the operation button of the electronic volume.
Even if the operation button is pressed continuously inadvertently, the volume will not reach the maximum all at once, thereby preventing the risk of erroneous operation while driving, for example.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of FIG. (1) is the electronic volume, (2) is the operation button switch, (3
) is an operation state detection circuit, (4) is an AND circuit, (5) is a clock generator, (6) is a counter, (7) is a comparator,
(8) is a flip-flop circuit, (9) is a transistor, (10) is a control circuit, and RV is a reference value.

Claims (1)

[Scope of Claims] An electronically controllable volume controller, a detection means for detecting the operation state of an operation button of the volume controller, and a clock that outputs a clock signal during the duration of the output signal of the detection means. generating means; counting clock signals from the clock generating means;
a comparison means for comparing with a reference value; a flip-flop means whose logical state is set by the output signal of the comparison means and the output signal of the detection means; and control of the volume adjuster according to the output signal of the flip-flop means. and a control means for controlling the volume control device, the control means for controlling the volume control being stopped when the count value of the comparison means reaches a reference value by continuously operating the operation button. .