JPH05206767A - Volume control device - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to instantly set the maximum or minimum volume adjustment in the volume adjustment test mode. When a test mode is instructed to the control circuit of the main body by the test mode instructing means, and a mode for increasing or decreasing the volume is instructed to the control circuit, the control circuit causes the volume maximum value setting means or the volume minimum value to be set. By driving the value setting means, it is possible to instantaneously set the volume adjustment of the main body to the maximum or minimum, and to perform the volume adjustment inspection in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume adjusting device for electronic equipment which changes the volume in a stepwise manner, and more particularly to a volume adjusting function capable of instantaneously setting the maximum or minimum value in a test mode on a production line or the like. The present invention relates to a volume control device including the.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional example.
The structure of a TV home terminal is illustrated. In FIG. 3, 1 is a CATV input terminal, 2 is a distributor, 3 is a tuner, 4 is an intermediate frequency (hereinafter referred to as iF) amplification detection circuit,
5 is an electronic volume, 6 is a high frequency (hereinafter referred to as RF) modulator, 7 is a data receiver, 8 is a control circuit section, 9 is a channel display section, 10 is an operation key, 11 is an output terminal, 1
Reference numeral 2 is a home terminal main body, and 13 is a television receiver.

A television signal a input from a CATV input terminal 1 is split by a distributor 2 into branch signals 1a and 2a.
Branched to. The branch signal 1a is converted into the iF signal if of the channel selected by the tuner 3, and then amplified and detected by the iF amplification detection circuit 4 to become a video signal P and an audio signal S. The sound signal S is volume-controlled through the electronic volume control 5 to become a sound signal S ′.

Both the video signal P and the audio signal S'are added to the RF modulator 6, converted into a video signal r of a specific frequency corresponding to an empty channel of the television receiver 13, and output via the output terminal 11. It This output terminal 1
1 by connecting the television receiver 13 to the CA
You can watch TV.

On the other hand, the branch signal 2a passes through the data receiver 7 and is demodulated into a data signal b, which is input to the control circuit section 8. The control circuit unit 8 is mainly composed of a microcomputer, and controls the entire home terminal main body 12 based on the control content of the data signal b. If the input from the operation key 10 is channel selection, the control circuit section 8 outputs the channel selection data C to the tuner 3 and simultaneously displays the selected channel on the channel display section 9. If the input from the operation key 10 is the volume up / down, the volume control data d is output to the electronic volume 5, and the audio signal S is controlled.

[0006]

In the above conventional home terminal, when the volume control function is inspected in the mass production line, at the maximum volume, whether the audio signal S'after passing through the electronic volume 5 is more than a specified value, In order to check whether the sound signal S ′ at the time of the minimum volume is below the specified value, the volume up key and the volume down key of the operation keys 10 were pressed to change the volume. It took time to change to the value. Normally, it takes about 6 seconds.

Further, it can be judged whether or not the volume reaches the maximum value or the minimum value by keeping the volume up / down key pressed for a while and checking whether or not the volume is further up / down. I can't
It will take more time. Therefore, there is a problem that the inspection time is increased and the inspection work efficiency is poor.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention controls a control circuit based on an instruction from the outside to provide an electronic volume control function for gradually increasing or decreasing the volume. In a device for adjusting the volume of a device, when a test mode instructing means for instructing the control circuit to perform a test mode and a mode for increasing the volume are instructed to the control circuit by the test mode instructing means, Is set to a maximum value, and a minimum volume setting means for setting the minimum volume when the test mode is instructed and a mode for decreasing the volume is instructed. ..

[0009]

According to the above construction, when inspecting the volume control function of the home terminal body in a mass production line, first the home terminal body is set to the test mode, and then the volume up is set.
When the key is pressed, the volume is instantly set to the maximum value, and when the volume down key is pressed, the volume is instantly set to the minimum value. Therefore, whether the audio signal S'after passing through the electronic volume 5 is at or above the specified value when the volume is maximum, and whether the audio signal S'after passing through the electronic volume 5 is at or below the specified value at the minimum volume It is possible to check whether or not the time required to change the volume from the maximum to the minimum by a few seconds (about 6 seconds) in the past, and it is possible to shorten the inspection time significantly. ..

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is implemented in a CATV home terminal will be described with reference to FIGS. In FIG. 1, parts corresponding to those of the conventional example shown in FIG. 3 is different from FIG. 3 in that the control flow for controlling the electronic volume 5 of the control circuit unit 16 including a microcomputer, the pull-up resistor 14 and the changeover switch 15 connected to the input terminal M of the control circuit unit 16 are different.
The test mode instructing section 17 is provided.

Pull-up resistor 14 and changeover switch 15
The test mode instructing section 17 composed of is used for switching the volume control function between the normal mode and the test mode. When the changeover switch 15 is OFF, the input terminal M of the control circuit section 16 is set to "H" by the pull-up resistor 14.
When the changeover switch 15 is turned on, the input terminal M of the control circuit section 16 is connected to GND and becomes "L" level. That is, the microcomputer of the control circuit section 16 operates in the normal mode if the input is "H", and operates in the test mode if the input is "L". Other operations of each block of the home terminal body 12 are the same as those described in the conventional example shown in FIG.

Next, the microcomputer operation of the control circuit unit 16 will be described with reference to the microcomputer operation flowchart shown in FIG. Starting from START, in STEP 1, it is checked whether or not a key is pressed, and if it is pressed, STE
The process moves to P2, and when the key is not pressed, the key press detection standby state is set. In STEP 2, the pressed key is volume up.
Check if it is the key or not, and if it is the volume up key, press STE
Move to P5, otherwise move to STEP3.

In STEP 3, the pressed key is volume do.
It is checked whether or not it is the wn key, and if the volume is the down key, move to STEP6, and if it is not the volume down key, the ST
Move to EP4. In STEP 4, processing based on the state of the pressed keys other than the volume up / down key is performed, and
Returning to EP1, the above operation is repeated again.

Next, in STEP 5, that is, when the volume up key is pressed, it is checked whether or not the test mode is set. If the test mode is set, the volume is set to the maximum value, and if it is not the test mode, the volume is increased by one step. Perform normal operation.

In addition, the ST in which the volume down key is pressed
In EP6, as in STEP5, it is checked whether or not the test mode is set, and if the test mode is set, the sound volume is set to the minimum value, and if it is not the test mode, the sound volume is lowered by one step. After that, the process returns to STEP 1 and the above operation is repeated again.

As described above, when the test mode is instructed from the test mode instructing section 17, the volume adjustment of the electronic volume 5 can be instantly set to the maximum value / minimum value based on the pressing of the volume up / down key. The volume adjustment function can be inspected in a short time. When the test mode instructing section 17 instructs the normal mode, the volume u
Based on the pressing of the p / down key, the normal operation of increasing or decreasing the volume adjustment of the electronic volume 5 step by step can be performed.

Although the above embodiment has exemplified the case where the present invention is applied to the CATV home terminal, the present invention can be widely applied to electronic equipment having a volume adjusting function capable of adjusting the volume step by step.

[0018]

Since the present invention is constructed as described above,
In the test mode, the volume up / down key can be pressed to instantly set the volume adjustment to the maximum / minimum value, and the inspection time for volume adjustment can be significantly shortened, so that the manufacturing cost can be reduced and the volume adjustment can be performed. At the time of the inspection, the volume can be reliably set to the maximum value or the minimum value, so that the inspection error can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart used to explain the operation of FIG.

FIG. 3 is a block diagram of a conventional example.

[Explanation of symbols]

 5 electronic volume 16 control circuit section 17 test mode instruction section

Claims (1)

[Claims] 1. A volume control device for an electronic device having a volume control function of controlling a control circuit to increase or decrease the volume stepwise based on an instruction from the outside, and instructing the control circuit to perform a test mode. A test mode instructing means, a volume maximum value setting means for setting the volume to a maximum value when the test mode is instructed to the control circuit by the test mode instructing means, and a mode for increasing the volume is instructed; A volume adjusting device comprising: a volume minimum value setting means for setting the volume to a minimum value when a mode is instructed and a mode for decreasing the volume is instructed.