JPS63299493A - Volume control device - Google Patents

Abstract

PURPOSE:To minimize a variation for one step of a volume control when the high output of a voice is not necessary by inserting a switching circuit to attenuate a volume control signal by switching it between a smoothing circuit to smooth a volume control pulse signal and a volume control part. CONSTITUTION:A switching circuit 5 is provided between a smoothing circuit 2 and a volume control part 3. When the high output of the voice is not used in the middle of the night, etc., and a change-over switch 7 of the switching circuit 5 is turned on, a volume control signal (c) is partially pressured by resistances 6 and 8, attenuated and inputted to a volume control part 3. In this case, the maximum output of the volume is made smaller, the number of steps of a volume control pulse signal (b) from a digital control part 1 is the same as the conventional one even in the variable scope during it, and therefore, the variation of the volume for one step can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a volume control device used in television receivers and the like.

2. Description of the Related Art In recent years, television receivers and the like have become more multifunctional and have improved basic performance, as well as higher audio output.

Hereinafter, a conventional volume control device will be explained based on FIG. 2.

FIG. 2 is a block diagram of a conventional volume control device. In FIG. 2, reference numeral 1 denotes a digital control unit composed of a microcomputer built into the television receiver, and the set volume signal a from the volume control switch of the television receiver body and the light receiving unit of the remote control device is When input, a volume control pulse signal [volume duck pulse] b having a pulse number corresponding to the volume of the set volume signal a is output to the smoothing circuit 2.

The volume control pulse signal consisting of this pulse train is smoothed by a smoothing circuit 2 to become a DC level volume control signal C, which is input to a volume control section 3. The left and right audio signals d outputted from the audio circuit of the television receiver at the volume control section 8 are converted into left and right audio signals e having peak values corresponding to the volume control signal C.
is output to . The left and right output signals f of the audio output section 4 are sent to the speaker, and become audio at a volume corresponding to the set volume signal a.

Problems to be Solved by the Invention However, the number of steps that can be subdivided and controlled for the total volume output of the volume control pulse signal is regulated by the resolution of the digital control unit 1 built into the television receiver. In a high output television receiver,
There is a problem in that the change in volume per step is large, and when high output is not used, such as late at night, it is not possible to clearly change the volume in low volume parts.

The present invention solves these conventional problems, and provides a volume control that uses a simple WM configuration and can reduce the amount of change per step of the volume control when high audio output is not required. The purpose is to provide a device.

Means for Solving the Problems In order to solve the above problems, the present invention provides a smoothing circuit for smoothing a volume control pulse signal having a pulse number corresponding to a set volume output from a digital control unit, and A volume control section that controls the volume in response to the smoothed and output volume control signal is provided, and between the smoothing circuit and the volume control section,
A switching circuit that attenuates the volume control signal by switching and outputs it to the volume control section is inserted, and the maximum output of the volume is switched to perform subdivided volume changes.

Effect According to the above configuration, by inserting a switching circuit between the smoothing circuit and the volume control section that attenuates the volume control signal and outputs it to the volume control section, the maximum output of the volume can be switched by the switching circuit. is,
By switching the maximum output of the volume to a small value, the amount of change in the volume per step of the volume NJi [1 pulse signal] from the digital control section becomes small, and the volume can be varied in small pieces. Furthermore, by not attenuating the volume control signal in the switching circuit, a high output volume can be obtained as is.

EXAMPLE Hereinafter, an example of the present invention will be explained based on the inside. Components and circuits that are the same as those in FIG. 2 of the conventional example are designated by the same reference numerals and explanations thereof will be omitted.

FIG. 1 is a block diagram of a volume controller (Lt) device according to the present invention. The present invention shown in FIG. 1 is constructed by adding a switching circuit 5 between the smoothing circuit 2 and the volume control circuit 8 in the conventional example shown in FIG. The switching circuit 5 has one end connected to the output end of the smoothing circuit 2 and the other end connected to the volume control source 3.
a first resistor 6 connected to the input terminal of the first resistor 6;
It is composed of a changeover switch 7 and a second resistor 8 connected in series between the other end of the circuit and the ground, and when the changeover switch 7 is on, the volume control signal C from the smoothing circuit 2 is attenuated to adjust the volume. Output to the control section 8.

With the above configuration, when the audio Takayama power is not used, such as late at night, by turning on the changeover switch 7 of the changeover circuit 5, the volume control signal C is transferred to the first and second resistors 6,
The voltage is divided by 8, attenuated, and input to the volume control section 8. In this case, the maximum volume output will be lower, but
Since the number of steps of the volume control pulse signal outputted from the digital control section 1 is the same as in the conventional case even in the variable range therebetween, the amount of change in volume for each step can be reduced. Furthermore, if the user wants to listen to audio at a high output as in the past, the changeover switch 7 of the changeover circuit 5 can be turned off, since the difference in volume from one speaker to another is not so important.

In this way, the maximum output of the volume can be changed as necessary using the switching circuit 5, and by reducing the volume, the amount of change in volume per step of the government control pulse signal can be reduced. It is possible to change the volume in small steps.

Effects of the Invention As described above, according to the present invention, a switching circuit is inserted between the smoothing circuit and the volume control section to attenuate the volume control signal and output it to the volume control section. The maximum volume output can be changed according to the purpose, and by reducing the maximum volume output, the amount of change in volume per step of the volume control pulse signal from the digital control section can be reduced. The practical effects of these changes are great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a volume control device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional volume control device. 1... Digital control section, 2... Smoothing circuit, 8...
- Volume control section, 5... Switching circuit, 6... First resistor, 7... Selector switch, 8... Second resistor, b... Volume control pulse signal, C... Volume control signal.

Claims (1)

[Claims] 1. A smoothing circuit that smoothes a volume control pulse signal having a pulse number corresponding to the set volume output from the digital control unit, and a volume control circuit that controls the volume in response to the volume control signal smoothed and output from the smoothing circuit. A volume control section is provided, and a switching circuit for attenuating the volume control signal by switching and outputting it to the volume control section is inserted between the smoothing circuit and the volume control section, and the maximum output of the volume is switched and subdivided. A volume control device configured to perform variable volume control.