JPH06105251A - Tuner controller - Google Patents

Abstract

PURPOSE:To reduce interference among plural tuners (interference of local oscillator onto other tuners), power consumption and spurious radiation by detecting a tuner not in use to turn off a power supply for the tuner not in use. CONSTITUTION:A control output of a microcomputer 2 is connected to a base of an NPN transistor(TR) 4. Then the microcomputer 2 discriminates whether or not a slave pattern is displayed at present and when displayed, the microcomputer sets the control output to an H(high level). Thus, the TR 4 is turned on, a TR 10 is turned on and the power for the slave pattern tuner is turned on. When the slave pattern is not displayed, the microcomputer 2 sets the control output to an L(low level). Thus, the TRs 4, 10 are turned off and the power supply for the slave pattern is turned off. Thus, when no slave pattern is displayed, the power of the slave pattern tuner is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuner control device suitable for, for example, a television receiver.

[0002]

2. Description of the Related Art Conventionally, a television receiver having a picture-in-picture function, that is, a function of displaying a small screen in a main screen has a main screen tuner and a small screen tuner.

[0003]

Conventionally, even if the sub-screen is not displayed or the sub-screen tuner is not used, the sub-screen tuner is powered on and unnecessary power is consumed. There was a loss.

The present invention has been made in view of such a situation, and an object thereof is to eliminate power loss of an unused tuner.

[0005]

A tuner control device according to a first aspect of the present invention comprises a detection means (for example, a microcomputer 2 in FIG. 1) for detecting a tuner which is not in use,
Control means for turning off the power of the tuner detected by the detection means (for example, the microcomputer 2 in FIG. 1) is provided.

A tuner control device according to a second aspect of the present invention is
A detection unit for detecting that the child screen is not displayed (for example, the microcomputer 2 of FIG. 1 that performs the process of step S1 of FIG. 2) and a child screen non-display detection by the detection unit Control means for turning off the power of the tuner (for example, the microcomputer 2 of FIG. 1 that performs the process of step S3 of FIG. 2) is provided.

A tuner control device according to a third aspect of the present invention is
Detecting means for detecting that the small screen tuner is not used for displaying the small screen (for example, step S12 in FIG. 3).
1) which performs the processing of FIG. 1) and a control means (for example, the processing of step S14 of FIG. 3) for turning off the power of the sub-screen tuner according to the detection of the non-use of the sub-screen tuner by the detection means. And the microcomputer 2) of FIG. 1 for performing.

[0008]

In the tuner control device of the first aspect of the present invention, a tuner that is not in use is detected, and the detected unused tuner is turned off.

In the tuner control device of the second aspect of the invention, it is detected that the child screen is not displayed, and the child screen tuner is powered off in response to the detection of the child screen non-display.

In the tuner control device of the third aspect of the present invention, it is detected that the sub-screen tuner is not used for the sub-screen display, and in response to the detection that the sub-screen tuner is not used, the sub-screen tuner is switched. The power is turned off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a tuner control device of the present invention. This embodiment is an example in which the present invention is applied to power control of a tuner for a small screen. The control output of the microcomputer 2 is connected to the base of the NPN transistor 4. The collector of the transistor 4 is connected to the + 5V DC power source via the resistor 6. The emitter of the transistor 4 is grounded. The collector of the transistor 4 is also connected to the base of the PNP transistor 10 via the resistor 8. The emitter of the transistor 10 is connected to the + 5V DC power supply. The collector of the transistor 10 is connected to the power input terminal of the sub-screen tuner.

FIG. 2 shows a first operation example of the embodiment shown in FIG. First, the microcomputer 2 determines whether the child screen is currently displayed (step S1), and if it is displayed, sets the control output to "H" (high voltage level) (step S2). As a result, the transistor 4 is turned on, the transistor 10 is turned on, and the sub-screen tuner is powered on.

When the child screen is not displayed, the microcomputer 2 sets the control output to "L" (low voltage level) (step S3). As a result, the transistor 4 is turned off, the transistor 10 is turned off, and the power of the sub-screen tuner is turned off.

As described above, when the small screen display is not performed, the power of the small screen tuner is turned off, so that the power consumption can be reduced.

FIG. 3 shows a second operation example of the embodiment shown in FIG. First, the microcomputer 2 determines whether or not the child screen is currently displayed (step S1). If so, whether the image of the child screen tuner is displayed on the child screen or the video signal from the VTR is displayed. It is determined whether it is displayed (step S12). When the output of the sub-screen tuner is displayed on the sub-screen (step S
12 (NO), the microcomputer 2 sets the control output to "H" (high voltage level) (step S13). As a result, the transistor 4 is turned on, the transistor 10 is turned on, and the sub-screen tuner is powered on.

When the video signal from the VTR is displayed on the child screen (YES in step S12), the microcomputer 2 sets the control output to "L" (low voltage level) (step S14). This turns off transistor 4, turning off transistor 10,
The tuner for the inset screen turns off.

As described above, even when the small screen tuner is displayed, when the small screen tuner is not used, the power of the small screen tuner is turned off, so that power consumption can be reduced.

In the above embodiment, the microcomputer 2 detects that the child screen is not displayed and turns off the child screen tuner (FIG. 2).
Alternatively, it is detected that the sub-screen tuner is not used for the sub-screen display and the power of the sub-screen tuner is turned off (FIG. 3). However, in the case of performing the processing shown in FIG. Even if the detecting means for detecting that the small screen is not displayed and the controlling means for turning off the power of the small screen tuner according to the detection of the small screen non-display by the detecting means are provided by separate hardware, respectively. Well, in the case of performing the processing as shown in FIG. 3, depending on the detection means for detecting that the child screen tuner is not used for displaying the small screen and the detection of the non-use of the small screen tuner by the detecting means. Then, the control means for turning off the power of the sub-screen tuner may be provided by separate hardware.

The above embodiment relates to power control of the tuner for the small screen, but the present invention is not limited to this, and for example, the tuner for VTR of a television receiver with a built-in VTR (video tape recorder). Etc. can also be applied.

[0020]

According to the tuner control device of the first aspect, the tuner which is not in use is detected and the power supply of the unused tuner is turned off, so that the power consumption can be reduced and the unnecessary radiation can be reduced. , Interference between a plurality of tuners (interference between other tuners of the local oscillator) can be reduced.

According to the tuner controller of claim 2,
By detecting that the inset screen is not displayed and turning off the inset screen power, the inset screen power consumption and unnecessary radiation can be reduced, and the inset screen and other tuners can be Interference (interference with other tuners of the local oscillator) can be reduced.

According to the tuner control device of claim 3,
By detecting that the sub-screen tuner is not used for the sub-screen display and turning off the power of the sub-screen tuner, the power consumption and unnecessary radiation of the sub-screen tuner can be reduced, and the sub-screen tuner can be reduced. Interference with other tuners (interference of the local oscillator with other tuners)
Can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an embodiment of a tuner control device of the present invention.

FIG. 2 is a flowchart showing a first operation example of the embodiment shown in FIG.

FIG. 3 is a flowchart showing a second operation example of the embodiment of FIG.

[Explanation of symbols]

 2 Microcomputer 4 NPN transistor 10 PNP transistor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenzo Nakai 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. A tuner control device comprising: detection means for detecting a tuner not in use; and control means for turning off the power of the tuner detected by the detection means. 2. A detection means for detecting that a small screen is not displayed, and a control means for turning off the power of the small screen tuner in response to the small screen non-display detection by the detection means. And tuner control device. 3. The detection means for detecting that the sub-screen tuner is not used for the sub-screen display, and the sub-screen tuner is powered off in response to detection of non-use of the sub-screen tuner by the detection means. A tuner control device comprising: a control unit.