JP2002290252A - Television broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television broadcast receiver that controls power in response to the connected state to an external device. SOLUTION: The television broadcast receiver 100 that is used being connected to an external device 113 via a cable is provided with a video signal level detection means 123 that detects a video signal level at a final output terminal, a power supply means 111 that controls supply of power to each section, and a control means 112 that controls the power supply means 111 on the basis of the video signal level at the final output terminal detected by the video signal level detection means 123.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television broadcast receiver and, more particularly, to a television broadcast receiver that uses a video signal cable to connect a display device or the like to an external device for displaying an image. is there.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a schematic configuration of a conventional television receiver.

The television broadcast receiver is used in a state where an external display device such as a television receiver or a CRT monitor is connected to the television broadcast receiver by a video signal cable for relaying a video signal.

When the user turns on the power switch 206, the power supply unit 207 is activated to supply power to the entire apparatus, and the control unit 208 starts overall control. A television broadcast is received by an antenna 201, and a received signal is sent to a video decoding unit 204 via a tuner unit 202 and a demodulation unit 203. The video signal decoded by the video decoding unit is transmitted by the video output processing unit 205 to the display device 209 connected to the outside of the receiver in the form of a video signal conforming to the rules to be output from the receiver.

[0005] In such a television broadcast receiver,
Power supply to the entire circuit and operation start are performed based only on the user's operation of turning on the power switch 206 of the apparatus. When the video signal cable is not connected to the television broadcast receiver,
That is, in a situation where output of a video signal is not desired, only the minimum power supply necessary for the user to perform the operation need be performed.

However, in a conventional television broadcast receiver, power is always supplied to all circuits even when no connection is made to an external display device, so that unnecessary power is consumed. become.

[0007] Even if the connection with the display device is incomplete and the video signal is not output normally, the user can determine the cause by the connection failure of the video signal cable. It is not possible to specify whether it is due to completeness or a defect in the television broadcast receiver itself.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a television broadcast receiver capable of controlling power in accordance with a connection state with an external device.

Another object of the present invention is to provide a television broadcast receiver capable of presenting a user with information on a connection state with an external device.

[0010]

According to a first aspect of the present invention, there is provided a video signal for detecting a video signal level at a final output terminal in a television broadcast receiver used while being connected to an external device via a cable. Level detection means, power supply means for controlling power supply to each section, and control means for controlling the power supply means based on the video signal level at the final output terminal detected by the video signal level detection means It is characterized by.

According to a second aspect of the present invention, in the first aspect, the control means determines whether or not an external device is normally connected based on the video signal level at the final output terminal. When the device is not properly connected, a means for powering down a power supply to a predetermined portion is provided.

According to a third aspect of the present invention, there is provided a synchronous signal level detecting means for detecting a synchronous signal level at a final output end in a television broadcast receiver used in a state of being connected to an external device via a cable. And a control means for controlling the power supply means based on the synchronization signal level of the final output terminal detected by the synchronization signal level detection means.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the control means determines whether or not an external device is normally connected based on the synchronization signal level of the final output terminal. When the device is not properly connected, a means for powering down a power supply to a predetermined portion is provided.

According to a fifth aspect of the present invention, there is provided a video signal level detecting means for detecting a video signal level at a final output terminal in a television broadcast receiver used in a state of being connected to an external device via a cable. Power supply means for controlling power supply of the power supply, a determination means for determining whether or not an external device is normally connected based on a video signal level at a final output terminal detected by the video signal level detection means, and a determination means And means for notifying the user of information on the connection state with the external device based on the determination result by (1).

According to a sixth aspect of the present invention, there is provided a synchronous signal level detecting means for detecting a synchronous signal level at a final output end in a television broadcast receiver used in a state of being connected to an external device via a cable. Power supply means for controlling power supply to the power supply, a determination means for determining whether or not an external device is normally connected based on the synchronization signal level at the final output terminal detected by the synchronization signal level detection means, and a determination means And means for notifying the user of information on the connection state with the external device based on the determination result by (1).

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

[1] Description of First Embodiment

FIG. 1 shows a schematic configuration of a television receiver 100. The television broadcast signal received by the antenna 101 is frequency-converted by the tuner 102, demodulated by the demodulator 103, and then decoded by the video decoder 104.

The OSD processing unit 105 adds an on-screen video signal to the video signal obtained by the video decoding unit 104.
The display is added and sent to the video output processing unit 106. The video signal output from the video output processing unit 106 is
The data is transmitted to the external display 113 via the video output circuit 107 and the cable 120. Video output circuit 107
Includes a video signal level detection unit 123. The control unit 108 is a part that controls the entire receiver.

When the user turns on the power switch 110, the power supply unit 111 is activated, and power is supplied to the control unit 108. Further, power of each unit of the apparatus is generated by the power supply unit 111 and supplied to each unit of the apparatus via the power supply control unit 112. The power control unit 112 is controlled by the control unit 108.

The television receiver has an LED display section 115 for displaying a connection state with the display 113. The LED display unit 115 is controlled by the LED control unit 114 based on a command from the control unit 108. The LED display section 115 is arranged on a front panel of the television receiver as shown in FIG.

The control unit 108 has an information storage unit 109
It has.

FIG. 3 shows a video output circuit 107 in the television receiver 100 and a part of a video input circuit in the display 113.

The video output circuit 107 in the television receiver 100 includes an amplifier 121, a 75Ω resistor 122, a video signal level detector 123, and an output terminal 124. The video input circuit of the display 113 includes an input terminal 131, a terminating resistor 132 of 75Ω, and the like.

The video signal output from the video output processing unit 106 is supplied to the television receiver 10 by the amplifier 121.
It is amplified from 0 to a specified signal level to be output.
The video signal amplified by the amplifier 121 further
Driven by a 5 Ω resistor 122, the signal is transmitted from an output terminal 124 via a video signal level detection unit 123.

The video signal cable 1 is connected to the video output terminal 124.
When the terminal 20 is not connected, the final end is in an open state, and the output value itself of the amplifier 121 is obtained from the video signal level detection unit 123 as a detection value. However, when the video signal cable 120 is normally connected between the video output terminal 124 and the input terminal 131, the video signal cable 120 is terminated by a 75Ω load resistor 132 disposed in the video input circuit in the display 113. , Output terminal 1
The signal level of 31 is two 75Ω resistors 122, 132
And is detected as a level of 1/2 {= 75 / (75 + 75)} of the output of the amplifier 121 at the time of opening.

That is, when the video signal cable 120 is normally connected between the video output terminal 124 and the input terminal 131, the output level of the amplifier 121 is set to L1, and the video signal cable 120 is connected to the video output terminal 124 Amplifier 1 when not properly connected to terminal 131
21 is L2, L1 = L2 × 1/2
Becomes

In this embodiment, the threshold value Th is determined in advance to determine whether the connection state between the television receiver 100 and the display 113 is normal based on the detection level of the video signal level detection unit 123. The information is stored in the information storage unit 109 in advance. The threshold value Th is set to a value obtained by adding a margin to a value expected to be detected when the video output terminal 124 is terminated by the load resistor 132 of 75Ω in the display 113. When the detection level of the video signal level detection unit 123 is L,
When L ≦ Th, it is determined that the connection state between the television receiver 100 and the display 113 is normal. If L> Th, it is determined that the connection state between the television receiver 100 and the display 113 is abnormal.

FIG. 4 shows the operation of the television receiver.

The power switch 11 of the receiver is set by the user.
When 0 is turned on (step 1), the power supply unit 111 is activated (step 2). When the power supply unit rises, the control unit 108 executes a control unit initial sequence (step 3). When the initial sequence is completed, the television broadcast signal is demodulated by the tuner unit 102 and the demodulation unit 103, and the output of the video signal from the video output processing unit 106 is started (step 4). Further, the video signal level detection by the video signal level detection unit 123 is started (Step 5).

The control unit 108 controls the video signal level detection unit 1
It is determined whether or not the connection state between the television receiver 100 and the display 113 is normal based on the video signal level L detected by the H.23 and the threshold Th stored in the information storage unit 109 (step). 6).

If the connection state is determined to be normal, the video output processing is continued (step 7). Further, the monitoring of the video signal level at the final end is continued (step 8), and the process returns to step 6.

If it is determined in step 6 that the connection state is abnormal, the power supply control unit 112 starts controlling the power supply circuit (step 9), and powers down circuits other than the minimum required circuits. The state is shifted to (step 10). Circuits other than the minimum required circuits include:
For example, an amplifier 121 in the video output circuit 107 is given. Then, the state is maintained.

In the above embodiment, the video signal level detector 123 detects the level of the video signal itself, but detects the level of a synchronization signal (for example, a horizontal synchronization signal) added to the video signal. You may do so. In this case, if the amplitude of the horizontal synchronizing signal when the video output terminal 124 is open is 0.6 V _PP , the threshold Th is set to, for example, 0.36 V, which is 60% of that. The video signal level detection unit 123 performs a level detection process using a horizontal synchronization signal as a trigger.

[2] Description of Second Embodiment In the second embodiment, when it is determined that the connection state between the television receiver 100 and the display 113 is normal, the LED display unit 115 Is turned on in green, and when it is determined that the connection state is abnormal, the LED display unit 115 is controlled so that the LED display unit 115 is turned on in red.

FIG. 5 shows the operation of the television receiver according to the second embodiment. When the power switch 110 of the receiver is turned on by the user (step 2).
1) The power supply unit 111 is activated (step 2)
2). When the power supply unit rises, the control unit 108 executes a control unit initial sequence (step 23). When the initial sequence is completed, the tuner unit 102 and the demodulation unit 1
03 demodulates the television broadcast signal, and the video output processing unit 106 starts outputting the video signal (step 24). Further, the video signal level detection by the video signal level detection unit 123 is started (Step 25).

The control unit 108 controls the video signal level detection unit 1
It is determined whether or not the connection state between the television receiver 100 and the display 113 is normal based on the video signal level L detected by the H.23 and the threshold Th stored in the information storage unit 109 (step). 26).

When the connection state is determined to be normal, L
The ED display 115 is turned on in green (step 27).
Further, the video output processing is continued (step 28). Further, the monitoring of the video signal level at the final end is continued (step 30), and the process returns to step 26.

If it is determined in step 26 that the connection state is abnormal, the LED display unit 115 is lit red (step 29). Further, the monitoring of the video signal level at the final end is continued (step 30), and the process returns to step 26.

The means for notifying the user of the connection state between the television receiver 100 and the display 113 is not limited to the LED display, but may be a message display or a warning sound source.

According to the first embodiment, when the normal user turns on the power switch of the television receiver,
The power supply to the entire circuit and the start of the normal operation are performed immediately. However, in a state where the video signal cable is kept connected and the video output is not requested, the user can set the television receiver or perform the operation. Only the minimum power supply required to operate is required. Further, even when the connection with the external display device is not completely established, power consumption can be reduced by partially power-down controlling the circuit.

According to the second embodiment, even if the connection with the display device is incomplete and the video signal is not output normally, the user can use the display device. From the LED display and the warning sound, it is possible to judge whether the cause is due to incomplete connection of the video signal cable, which is one of the causes, and provide more flexible and smooth service to the user. Can be provided.

[0043]

According to the present invention, power can be controlled according to the state of connection with an external device. Further, according to the present invention, it is possible to present information on a connection state with an external device to a user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a television receiver.

FIG. 2 is a front view showing a front panel of the television receiver.

FIG. 3 is a video output circuit 1 in the television receiver 100.
07 is a circuit diagram showing a part of a video input circuit in a display 113.

FIG. 4 is a flowchart illustrating an operation of the television receiver according to the first embodiment.

FIG. 5 is a flowchart showing an operation of the television receiver according to the second embodiment.

FIG. 6 is a block diagram showing a schematic configuration of a conventional television receiver.

[Explanation of symbols]

 Reference Signs List 101 antenna 102 tuner section 103 demodulation section 104 video decoding section 105 OSD processing section 106 video output processing section 107 video output circuit 108 control section 109 information storage section 110 power switch 111 power supply section 112 power supply control section 113 display 114 LED control section 115 LED Display unit 123 Video signal level detection unit

Claims (6)

[Claims] 1. A video signal level detecting means for detecting a video signal level at a final output terminal in a television broadcast receiver used in a state of being connected to an external device via a cable, and controlling power supply to each section. A television broadcast receiver, comprising: a power supply unit that performs power control; and a control unit that controls the power supply unit based on a video signal level at a final output terminal detected by the video signal level detection unit. 2. The control means includes means for determining whether an external device is normally connected based on a video signal level at a final output terminal, and a predetermined value when the external device is not normally connected. The television broadcast receiver according to claim 1, further comprising: means for powering down the power supply to the portion. 3. A synchronizing signal level detecting means for detecting a synchronizing signal level at a final output terminal in a television broadcasting receiver used in a state of being connected to an external device via a cable, and controlling power supply to each section. A television broadcast receiver, comprising: a power supply unit that performs power control; and a control unit that controls the power supply unit based on a synchronization signal level at a final output terminal detected by the synchronization signal level detection unit. 4. The control means determines whether or not the external device is normally connected based on the synchronization signal level of the final output terminal. The television broadcast receiver according to claim 3, further comprising: means for powering down a power supply to the portion. 5. A video signal level detecting means for detecting a video signal level at a final output terminal in a television broadcast receiver used in a state of being connected to an external device via a cable, and controlling power supply to each section. Power supply means, a determination means for determining whether an external device is normally connected based on the video signal level at the final output terminal detected by the video signal level detection means, and a determination result based on the determination result by the determination means. Means for notifying a user of information on a connection state with an external device, and a television broadcast receiver. 6. A synchronizing signal level detecting means for detecting a synchronizing signal level of a final output terminal in a television broadcasting receiver used in a state of being connected to an external device via a cable, and controlling power supply to each section. Power supply means, a determination means for determining whether or not an external device is normally connected based on a synchronization signal level at a final output terminal detected by the synchronization signal level detection means, and a determination result based on a determination result by the determination means. Means for notifying a user of information on a connection state with an external device, and a television broadcast receiver.