JPS5846114B2 - television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for improving the volume, color saturation, and
Regarding the means for controlling adjustment of brightness, etc. and channel switching, a keyboard for channel switching can also be used for inputting adjustment levels of volume, color saturation, brightness, etc., and can be used with many controlled circuits with a simple configuration. The aim is to provide a channel selection circuit that is easy to operate and can be precisely controlled.

Recently, methods have been proposed for adjusting the volume, color saturation, etc. of a television receiver without using a variable resistor.

This uses a clock pulse generation circuit, a counter, and a D-A converter circuit. The counter counts clock pulses while the adjustment switch is operated, and the counted output is analog-controlled by the D-A converter circuit. Convert to voltage,
By applying voltage to the voltage-controlled variable gain amplifier circuit of the volume circuit or chroma circuit, the volume, color saturation, etc. are continuously switched at a constant level, and after the switch is released, the current level is maintained and adjusted. It is said to be completed.

However, with such adjustment means, if the speed of change of the volume or color saturation during adjustment is made too fast, it becomes difficult to stop at the desired adjustment state, so it is necessary to keep the change speed considerably slow. Therefore, there is a drawback in terms of operability that it takes a lot of time to achieve the desired adjustment state during adjustment.

On the other hand, if an attempt is made to provide an operation switch that directly applies the level of each adjustment state such as volume and color saturation to the D-A converter circuit in order to eliminate such drawbacks, it would be necessary to provide multiple operation switches for each adjustment function. A problem arises in that many level designation switches are required, making the configuration too complex and very impractical.

Therefore, the present invention solves all of these problems, and allows many adjustment functions such as volume, color saturation, brightness, etc. It is an object of the present invention to provide a television receiver that can be finely adjusted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to three adjustments of volume, color saturation, and brightness of a television receiver, and for channel switching will be described in detail below with reference to the drawings.

In the figure, 1 is the main television receiver circuit,
Here, only four circuits are shown: a volume circuit 2a, a chroma circuit 2b, a video circuit 2c, and a channel selection circuit 2d, and all other circuits are omitted.

Each of the circuits 2a, 2b, 2c includes a voltage-controlled variable gain amplifier circuit controlled by an analog control voltage for adjusting volume, color saturation change, and brightness.

The residual channel selection circuit 2d includes a decoder 2e that selectively outputs an output according to the digital control signal so that the selected channel is controlled by the digital control signal of four binary digits;
A tuning voltage setting circuit 2f which presets a tuning voltage to the variable capacitance diode for each channel and selects it by the output of the decoder 2e.

Tuner 2 whose tuning frequency is controlled by the tuning voltage
It is equipped with g.

3a, 3b, and 3c are D-A conversion circuits 4a, 4b, and 4c that generate analog control voltages for volume, color saturation change, and brightness control to be applied to the audio circuit 2a, chroma circuit 2b button, and video circuit 2c, respectively.

Reference numeral 4d denotes a latch circuit that supplies digital control signals for control to the D-A conversion circuits 3a, 3b, 3c and the tuning circuit 2d, respectively.

On the other hand, 5 is a keyboard for inputting the desired level of volume, color saturation change, and brightness, and the desired channel number.
A to 5p controller is used to allow 16 control levels and 16 channels to be specified.

Reference numeral 6 denotes an encoder that converts the 16 types of control signals and channel signals inputted from the keyboard 5 into 4-bit digital control signals.It may be of a general circuit, and is operated when any of the key switches 5a to 5p is operated. When this happens, a latch pulse is also generated along with the digital control signal.

The generated digital control signal is applied to the switching circuit 7, which switches which of the three latch circuits 4a to 4d to apply the signal to.

Furthermore, 8 is a selection circuit for selecting whether to control and adjust the volume, control and adjust the color saturation, control and adjust the brightness, or switch channels.
First, a volume switch 9a, a color saturation switch 9bi, and a brightness switch 9c are provided.

These three switches 9a to 9c are push button switches in which only one is selectively turned on, and the output of each is sent to the flip-flop 10a.

In addition to the set terminals of flip-flops 1 ob and 10c, they are set, and their respective outputs are all added to the reset terminal of flip-flop 10d via diodes to be reset.

Furthermore, the latch pulses generated from the encoder 6 are delayed a little by the delay circuit 11, and the flip-flops 10a to 1
In addition to the reset terminal 0c, it is reset, and in addition to the set terminal of the flip-flop 10d, it is set.

Therefore, on the keyboard 5, any key switch 5a~
After a short time has elapsed since 5p was operated, all of the flip-flops 10a to 10c are reset by the output of the delay circuit 11, leaving only the flip-flop 10d set.

Further, when any of the selection switches 9a to 9c is operated, only the flip-flops 9a to 9c connected to the operated switch are set, and the remaining two flip-flops are set. One residue is reset, and the flip-flop 10d is also reset.

12at12b, 12c, and 12a control the switching circuit 7 according to the outputs of the flip-flops 10a to 10d.
This is a switching circuit for switching to supply the digital section side signal from the encoder 6 only to the latch circuits 4a to 4d corresponding to the flip-flops in the set state.

Also 13a, 13b, 13c. 13d indicates latch circuits 4a to 4 according to the outputs of flip-flops 10a to 10d.
This is a switching circuit for switching so that the latch pulse from the encoder 6 is supplied only to the flip-flops corresponding to the flip-flops in the set state.

Next, the adjustment control operation in such a configuration will be explained.

First, when none of the selection switches 9a to 9c in the selection circuit 8 is operated, only the flip-flop 10d is in the set state, as described above, to control the selected channel.

Therefore, at this time, the key switch 5a of the keyboard 5
〜The channel you wish to select among 5p, for example, the 2nd
When the channel 5b is operated, a digital control signal of "0010" is generated from the encoder 6 and is supplied via the switching circuit 7 to the latch circuit 4d.

At the same time, the latch pulse generated from the encoder 6 is applied to the latch circuit 4d via the switching circuit 13d, and the previous digital control signal is applied to the latch circuit 4d.
latched to.

As a result, from then on, this digital signal is transmitted to the tuning circuit 2.
d, and the desired second channel is selected.

In this way, when the keyboard 5 is operated without operating any of the selection switches 9a to 9d, channel switching control is performed.

Next, if you want to adjust the volume, color saturation, or brightness, first go to the selection circuit 8 and operate any switch 9a, 9b, or 9c to adjust the volume, color saturation, or brightness. Select which of the following to adjust.

Here, as an example, it is assumed that the degree of color saturation is to be adjusted, and the switch 9b is operated.

Then, by this operation, the flip-flop 10b is set and the flip-flop 10d is reset to the color saturation adjustment state, and the switching circuit 7 to the latch circuit 4
A digital control signal is supplied only to the latch circuit 3b, and a latch pulse is supplied from the switching circuit 13b only to the latch circuit 3b.

Next, the user operates the key switch on the keyboard 5 corresponding to the desired adjustment level, for example, the desired color saturation level.

For example, if you want to adjust to the eighth level, input by operating the key switch 5h.

Then, a digital control signal of "1000" is generated from the encoder 6, and is applied to the color saturation latch circuit 4b via the switching circuit 7.
A latch pulse is generated from the switching circuit 13.
The digital control signal is also applied to the latch circuit 4b via the input signal 1, whereby the digital control signal at the eighth level is latched into the latch circuit 4b, regardless of the color saturation level at 1.

Therefore, from then on, the digital control signal is D - A
The conversion circuit 3b converts the voltage into an analog control voltage for the eighth stage and applies it to the chroma circuit 2b, so that the color saturation is adjusted to the level of the eighth stage.

When the latch of the digital control signal to the latch circuit 4b is completed, the flip-flops 10a to 10c are set by the latch pulse delayed by the delay circuit 11, and the flip-flop 10d is reset, and the state returns to the first standby state, that is, the channel switching state. to return to.

Of course, if you wish to adjust to a level other than this, you can operate the key switches 5a to 5p of the desired level on the keyboard 5.

If you wish to adjust other volume levels, please operate the switch 9a of the selection circuit 8 and then input the desired volume level using the keyboard 5.If you wish to further adjust the brightness, operate the switch 9c of the selection circuit 8. Then, the desired brightness level may be input using the keyboard 5.

In this way, this device has switches 9a to 9c of the selection circuit 8 and key switches 5a to 5a of the keyboard 5.
You can switch channels by simply operating 5P, and you can also finely adjust the desired level of volume, color saturation, and brightness to the desired level.
It is possible to realize adjustments with very good operability.

Moreover, although the channels can be switched to 16 types and the three adjustment functions can be finely adjusted to 16 levels each, the number of switches is only 19, and the configuration is extremely simple. Thus, it has been possible to obtain an extremely practically useful adjustment control means that can be used as a control device.

Various input means such as a remote control signal receiving circuit can be used in place of the buttons, the keys on the keyboard 5, and the switches on the selection circuit 8, and the effect is particularly great when the present invention is implemented for remote control. It is.

Moreover, the above-mentioned D-A conversion circuit 3 a t 3 b 1
3c, latch circuits 4a, 4b, 4c, 4d, encoder 6, switching circuit 7, selection circuit 8, etc., other than switches may be realized by a microcomputer or the like.

Further, although the above embodiment has been described for the case where it is implemented for channel switching and three adjustment controls of volume, color saturation, and brightness for a television receiver, the present invention can also be applied to a television receiver. This can be widely implemented when controlling multiple arbitrary types of adjustment functions.

As detailed above, in the present invention, the adjustment function to be controlled is selected by the selection circuit, and the level signal input from the common input means is selectively latched by the latch circuit for channel switching and each adjustment function. The output is supplied for channel switching, and it is also D-A converted and applied as an analog control voltage to the controlled circuit, so it is a simple configuration with few input means, and it can be used to switch the selected channel and many controlled circuits. It has been possible to obtain a device with extremely great practical effects that allows fine control of the circuit with good operability.

[Brief explanation of drawings]

The figure is a block diagram of a television receiver according to an embodiment of the present invention. 1...Television receiver circuit, 2a...
・Audio circuit, 2b...Chroma circuit, 2c...
...Video circuit, 2d...Tuning selection circuit, 3a, 3
b, 3c...D-A conversion circuit, 4a, 4b, 4
c, 4d...Latch circuit, 5...Keyboard, 6...Encoder, 7...Switching circuit, 8...Selection circuit, 9a t 9b t
9c...-switch, 10a, 10b, 10c, 1
0a...Flip-flop, 11...
Delay circuit, 12 a, 12 b t 12 c, 1
2 d t 13 a t13b, 13c, 13d...
...Switching circuit.

Claims (1)

[Claims] 1 A plurality of controlled circuits controlled by analog control voltages, a plurality of D-A converters that generate analog control voltages to be applied to each of the plurality of controlled circuits, and a channel selection system based on digital control signals. A tuning circuit for controlling a channel, a plurality of latch means for supplying control digital control signals to the plurality of DA conversion circuits and the tuning circuit, respectively, and the plurality of controlled circuits. common input means for inputting a control signal for controlling the channel selection circuit and a channel signal for controlling the channel selection of the tuning circuit, and converting the control signal and channel signal input from the input means into digital control signals. encoder means; selection means for inputting a selection signal instructing which of the plurality of controlled means and the tuning circuit is to be controlled; A television receiver comprising switching means for selectively supplying control signals to the plurality of latch means.