JPH0513052Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an electronic volume control device such as an electronic volume control device.

BACKGROUND ART Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a volume UP key to command the volume up, 2 is a volume DOWN key to command the volume down, and an up/down (U/D) counter 3 is activated in response to the up or down commands from these keys. Performs an up or down count. That is, each output of keys 1 and 2 becomes two inputs of NAND gate 4, and its output becomes a gate control input of AND gate 6 that selectively passes the clock from clock generator 5. When the output is generated, the clock is supplied to the counter 3, and the counter 3 counts the clock continuously or intermittently in the up or down direction. The count value of the counter 3 is supplied to a subtracter 7, and the subtracter 7 always subtracts a constant value. This subtraction value corresponds to the amount of volume attenuation.

8 gives a command to attenuate the volume by a certain amount.
This is the ATT key, and its output becomes the clock input for the JK flip-flop 9. flipflop 9
is inverted every time the output is supplied from ATT key 8,
The output is supplied to the switching circuit 10 as a switching signal for switching ATT on/off (operation/non-operation). The switching circuit 10 selects either the count value of the counter 3 or the subtracted value subtracted by the subtracter 7 according to the switching signal. The count value or subtraction value selected by the selection circuit 10 is the D/A
The signal is converted into an analog signal by a (digital/analog) converter 11 and becomes a control input for the electronic volume 12. In the electronic volume 12, the signal level of the audio signal is attenuated in accordance with the signal level of the control signal.

In such a configuration, UP key 1 or
By pressing the DOWN key 2, the counter 3 counts up or down, thereby increasing or decreasing the volume one step at a time. On the other hand, the ATT operation using the ATT key 8 is performed when the user wants to quickly lower the volume for some reason. That is, when the ATT key 8 is pressed once, the ATT operation state is entered, and the value subtracted by the subtracter 7 is selected by the selection circuit 10 and the value is selected by the D/A converter 1.
1 to the electronic volume 12,
The volume is attenuated by a certain amount at a time. Then, press the ATT key 8 again,
Since the ATT becomes inactive and the count value of the counter 3 is selected by the selection circuit 10, the original volume is restored.

In this way, with conventional electronic volume control devices,
Regarding ATT operation, each time you press ATT key 8,
It was configured to perform a so-called toggle operation that alternates between two operating states, ATT operating and non-operating, so for example, after lowering the volume by ATT operating, you forget that ATT is operating and lower the volume. UP
If you use key 1 to raise the volume to an appropriate level, and then press ATT key 8 again to perform the ATT operation, the ATT operation will be canceled this time, so the volume will only increase by a certain amount at once. This could result in unexpected loud noises being produced.

Summary of the invention This invention was created in view of the points mentioned above.
The purpose of the present invention is to provide an electronic volume control device that eliminates the conventional problem caused by forgetting to release the ATT by eliminating the action of releasing the ATT.

The electronic volume control device according to the present invention includes an up-down key that issues an up or down command, a counter that counts up or down for each unit count in response to the up or down command, and an attenuation command key that issues an attenuation command. and,
an electronic volume adjustment device comprising: attenuation means for attenuating the volume by a predetermined amount in response to the attenuation command; and finely adjusting the volume according to the count output of the counter; subtracting means for subtracting the count output of the counter by a predetermined count number that is larger than the unit count number;
The present invention is characterized by comprising counter control means for loading the subtraction output of the subtraction means into the counter as a count value in response only to the time point when the attenuation command is generated.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, the volume UP key 21 and
Each output of the DOWN key 22 becomes an up (U) and down (D) control input of an up/down counter 23. Counter 23 counts up or down the clock from clock generator 24 in response to these control inputs. The count value of the counter 23 is latched by a latch circuit 25. The count value of the counter 23 latched by the latch circuit 25 is supplied to a decoder 26 and a subtracter 27.

The decoder 26 converts the count value of the counter 23 latched by the latch circuit 25 into volume control data and supplies it to the electronic volume control data. On the other hand, the subtracter 27 obtains a value obtained by subtracting the constant attenuation value set by the attenuation amount setting circuit 29 from the output value of the latch circuit 25. The value is the counter 23
ATT key 3 serves as the LOAD control input for
In response to an output of 0 (external command), a new count value is loaded (written) into the counter 23.

Next, the operation of the electronic volume control device according to the present invention will be explained.

First, by pressing the UP key 21 or the DOWN key 22, the counter 23 counts up or down, thereby increasing or decreasing the volume one step at a time. On the other hand, if you suddenly want to reduce the volume for some reason,
Press the ATT key 30. As a result, the output value of the subtracter 27 obtained by subtracting the preset attenuation value from the count value that had been counted by the counter 23 and latched in the latch circuit 25 is loaded into the counter 23. Therefore, the volume is attenuated at once by a certain amount corresponding to a preset attenuation value. From then on, use the UP key 21 or DOWN key 22 based on that volume level.
The volume is controlled by the .

In the above embodiment, a hardware configuration has been described, but a microcomputer is used, and the counter 23, clock generator 24, latch circuit 25, decoder 26, subtracter 27, etc. in FIG. 2 are implemented by the microcomputer. It is also possible to use internal and external RAM (Random Access Memory) and registers.

Further, in the above embodiment, the volume is reduced by a certain amount at a time, but the present invention can also be applied to a case where the sound volume is increased by a certain amount at a time.

Effects of the Invention As explained above, according to the electronic volume adjustment device according to the present invention, the counter is originally used for fine adjustment of the volume, but the count output is converted to a predetermined count corresponding to a predetermined volume by the subtraction means. By subtracting only a few minutes and loading the subtracted output of the subtraction means into the counter as a count value in response to the occurrence of the attenuation command, problems related to the ATT release operation can be solved, and furthermore, the problem related to the ATT release operation can be solved. Stepwise attenuation control can also be performed with a single command, and can be realized with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, and FIG. 2 is a block diagram showing an embodiment of the present invention. Explanation of the symbols of the main parts, 1, 21...Volume UP
Key, 2, 22...Volume DOWN key, 3, 23
...Up/down counter, 7, 27...Subtractor, 12, 28...Electronic volume, 25...Latch circuit.

Claims (1)

[Claims for Utility Model Registration] An up-down key that issues an up or down command, a counter that counts up or down for each unit count in response to the up or down command, and a damping command key that issues a damping command; An electronic volume adjustment device comprising: attenuation means for attenuating the volume by a predetermined amount in response to the attenuation command, and finely adjusting the volume according to the count output of the counter, wherein the attenuation means a subtraction means for subtracting the count output of the counter by a predetermined count number larger than the unit count number; and a counter for loading the subtraction output of the subtraction means into the counter as a count value only in response to the generation of the attenuation command. An electronic volume adjustment device characterized by comprising a control means.