JPS6160606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device used when controlling the volume, etc. of a television receiver by digital control means, and a device that can easily bring the control state to a reference state. It provides:

Recently, means have been proposed for adjusting the volume, brightness, color saturation, etc. of a television receiver without using a variable resistor. This uses clock pulses, a counter, and a D-A converter.The counter counts the clock pulses while the switch is operated directly or remotely, and the counted output is converted into an analog control voltage using the D-A converter. By converting it into a voltage control type variable gain amplifier such as an audio amplification circuit, video amplification circuit, or chroma circuit, the volume etc. can be adjusted sequentially, and the switch operation will be stopped when the desired adjustment state is reached. After that, the adjusted state is maintained. Such a device is particularly effective when controlling by remote control.

However, in such a device, the adjustment state cannot be determined by the indicated position of the adjustment knob, unlike in conventional variable resistor control devices.
For this reason, there are inconveniences such as not knowing what kind of adjustment state is currently in place, or being unable to know whether the adjustment state is bad or the control circuit is malfunctioning when the adjustment state is abnormal.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an apparatus which can eliminate such inconveniences and easily control to a standard reference control state.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing an embodiment implemented for adjusting the volume, brightness, and color saturation of a television receiver.

In the figure, reference numeral 1 denotes a television receiver circuit, which is the main body, and here only an audio amplifier circuit 2a, a video amplifier circuit 2b, and a band amplifier circuit 2c are shown, and all other circuits are omitted. These circuits 2a, 2
b and 2c each include a voltage-controlled variable gain amplifier circuit so as to be controlled by an analog control voltage for adjusting volume, brightness, and color saturation. 3a, 3b, and 3c are D for generating analog control voltages for volume, brightness, and color saturation control to be applied to each of the circuits 2a, 2b, and 2c, respectively.
-A converter, 4a, 4b, 4c are each D
- This is a latch circuit that supplies a 4-digit binary control signal to the A converters 3a, 3b, and 3c. These latch circuits 4a, 4b, and 4c are each equipped with a presettable counter, and by counting clock pulses, they sequentially increase or decrease the latched digital control signal and sequentially convert the analog control signal. In addition to being able to adjust the analog control signal, it is also possible to bring the analog control signal into the reference control state by latching the input four-digit binary control signal for reference control as it is.

5a, 5b, and 5c are clock pulse generation circuits 6a, 6b, and 6c that supply count-up and count-down clock pulses to each of these latch circuits 4a, 4b, and 4c, respectively;
7a, 7b, and 7c are switches operated manually to generate count-up or count-down clocks from the clock pulse generation circuits 5a, 5b, and 5c during adjustment, and 8 is a switch operated by the clock pulse generation circuit 5a during adjustment by remote control. This is a remote control receiving circuit for operating 5b and 5c.

Therefore, switch 6a, 6b, 6c or 7
The clock pulse generating circuits 5a, 5
Clock pulses are generated from clock pulses b and 5c, which are counted by latch circuits 4a, 4b and 4c, and their output digital control signals are sequentially increased or decreased to arbitrarily adjust the volume, brightness and color saturation.

On the other hand, 9a, 9b, and 9c are variable resistors in which standard adjustment states of volume, brightness, and color saturation, that is, reference control states, are preset; 10 is a switch operated to set the reference state; and 11 is a switch. A switching pulse generation circuit that sequentially generates three switching pulses when 10 is operated; 12 is a switching pulse generation circuit that is switched by the switching pulses to connect variable resistors 9a and 9;
13 is an A-D converter that converts the switched and extracted control voltage into a 4-digit binary reference digital control signal; 14 is a switching pulse generation circuit 1;
Latch circuits 4a, 4b, 4c switch the reference digital control signal by switching pulses from 1
This is a switching circuit that sequentially supplies

Further, 15a, 15b, 15c are normally closed switching circuits 16a, 16b, 16c which switch whether or not to supply the latch pulses generated from the switching pulse generating circuit 11 in synchronization with the switching pulses to the latch circuits 4a, 4b, 4c. are switches 17a, 17b, which are operated when only one of volume, brightness, and color saturation is desired to be in the standard control state;
17c are switches 16a, 16b, 16, respectively.
When c is operated, a selection pulse is generated that is connected at least until after the operation of the switching pulse generation circuit 11 is completed, and the switching circuits 15a, 15b,
This is a selection pulse generation circuit which stops the supply of latch pulses by opening the latch pulses other than those to be controlled to be in the reference control state among the latch pulses 15c.

With such a configuration, the switches 16a,
Switch 1 is activated without operating 16b and 16c.
If only 0 is operated, a switching pulse is generated from the switching pulse generation circuit 11 and the variable resistor 6
The reference control voltages from a, 6b, 6c are sequentially A-D.
converter, each converted into a reference digital control signal and sequentially applied to the switching circuit 14, where also switched by the switching pulse, the reference digital control signal for volume control is applied to the latch circuit 4a, and the reference digital control signal for brightness control is applied to the latch circuit 4a. A reference digital control signal for color saturation control is supplied to a latch circuit 4b, and a reference digital control signal for color saturation control is supplied to a latch circuit 4c. Along with this, the switching pulse generation circuit 1
A latch pulse generated from 1 to 1 in synchronization with the switching is applied to the latch circuits 4a, 4b, 4c via the switching circuits 15a, 15b, 15c, and the respective reference digital control signals are latched in all of them. Therefore, at this time, the volume, brightness, and color saturation are all adjusted to the reference control state.

On the other hand, when any one of the switches 16a, 16b, 16c is operated and then the switch 10 is operated, the switching pulse generation circuit 1
1. The operations of the switching circuit 12, A-D converter 13, and switching circuit 14 are the same as those described above, but this time selection pulses are generated from the selection pulse generation circuits 17a, 17b, and 17c, and the switching circuit 15
Since the transmission of the latch pulses in a, 15b, and 15c is selectively controlled, only selected ones of the volume, brightness, and color saturation are brought to the reference state. For example, if the switch 10 is operated after the switch 16a for selecting the volume is operated, a low level selection pulse is generated from the selection pulse generation circuit 17a and the selection pulse is sent to the switching circuit 15b.
and 15c, and since the switching circuits 15b and 15c are placed in the open or cut-off state, no latch pulse is applied to the latch circuits 4b and 4c, and therefore their brightness and color saturation are The reference digital control signal is latched only to the latch circuit 4a to which the latch pulse is applied, and only the volume is brought to the reference control state. The same applies when the switches 16b and 16c are operated, and only the brightness and color saturation are brought into the reference control state.

In this way, in this device, all or any one of the volume, brightness, and color saturation can be immediately controlled to the standard level by only operating the switch 10, or the switches 16a, 16b, 16c and the switch 10, regardless of the adjustment status up to that point. The advantage of this system is that it can immediately return to the standard control state even if the previous adjustment state is not known, and it solves the biggest drawback of conventional digital control methods. It is. When an abnormal adjustment state occurs, it can be determined that the adjustment circuit is malfunctioning by switching to the reference control state as described above and observing the state at that time, that is, determining whether or not it has returned to the reference state. In this way, it is possible to immediately know whether the deviation is caused by a manual adjustment or a deviation due to manual adjustment, thereby making it possible to obtain a device that is easy to use.

In the above embodiments, the case where the present invention was implemented for adjustment of a television receiver was described, but the present invention can be widely implemented for adjustment control of various types of equipment. Further, the number of objects to be adjusted and controlled can be set to an arbitrary number. Further, the specific circuit may be designed and implemented as appropriate other than the above-mentioned embodiment as long as it performs the same operation, and it is of course possible to implement the circuit using a microcomputer or the like.

As detailed above, in the present invention, the volume of the television receiver can be controlled by the digital control means.
In a device that controls analog quantities such as brightness and color saturation, the latch means can latch the digital signal of the reference control state.
Even in a digital control means whose previous adjustment state is not known, it is possible to easily and immediately obtain a standard adjustment state, and it is possible to obtain a useful device in which failures in the control circuit can be easily determined. Also,
By operating the switch to set the standard state, and further operating this switch and the standard state selection means, it is possible to sequentially adjust the volume, brightness, and color saturation to the standard control state, and also to adjust the volume, brightness, and color saturation to the standard control state. Only one of the color saturations can be adjusted to the reference control state, which is extremely useful in practice.

[Brief explanation of the drawing]

The figure is a block diagram of a control device in one embodiment of the present invention. 1...Television receiver circuit, 2a...Audio amplification circuit, 2b...Video amplification circuit, 2c...Band amplification circuit, 3a, 3b, 3c...D-A converter, 4a, 4b, 4c...Latch circuit ,5a,5
b, 5c...Clock pulse generation circuit, 6a, 6
b, 6c, 7a, 7b, 7c... switch, 8...
...Remote control receiving circuit, 9a, 9b,
9c...variable resistor, 10...switch, 11...
...Switching pulse generation circuit, 12...Switching circuit, 13
...A-D converter, 14...Switching circuit, 15
a, 15b, 15c... switching circuit, 16
a, 16b, 16c... switch, 17a, 17
b, 17c... Selection pulse generation circuit.

Claims (1)

[Claims] 1. A plurality of controlled circuits controlled by analog control voltages for adjusting at least the volume, brightness, and color saturation of a television receiver, and generating an analog control voltage to be applied to the plurality of controlled circuits. A D-A conversion means, a plurality of latch means for latching digital control signals supplied to the D-A conversion means, and sequentially decreasing or increasing the digital control signals latched in the plurality of latch means. A pulse generating means for adjusting the analog control voltage, a plurality of reference control voltage setting means in which reference control voltages representing reference control states are set in advance, and each reference control voltage from the plurality of reference control voltage setting means An A-D conversion means that converts into a digital control signal and outputs it, a reference control state operating switch that is operated to set the reference control state, and when the reference control state operating switch is operated, it converts to a plurality of reference control voltages. switching means for sequentially supplying a plurality of digital control signals based on the latching means to the latching means; and a selection pulse generating means for selectively latching any one of the plurality of digital control signals to the latching means. A control device comprising: