JP2002152624A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the problem of noise by once disconnecting a power supply when a speaker emits large sound. SOLUTION: This television receiver for emitting the sound by transmitting a sound signal at a level corresponding to the controlled quantity of sound of a sound controlling part from a sound outputting part 7 to the speaker side, is provided with a controlling part 15 for controlling so as to disconnect the output voltage of power supply circuit 10 for feeding voltage to a load side including the sound outputting part when the level of the sound signal to be outputted from the sound outputting part becomes a preliminarily set level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for adjusting the volume of sound emitted from a speaker by operating a key or a volume. The present invention relates to a television receiver that can be restarted.

[0002]

2. Description of the Related Art In the case of audio-visual equipment, adjustment of the sound emission volume of a speaker is usually performed by turning a knob or pressing an up / down key, but various devices for emitting sound at a preset sound volume have been proposed. ing. As one example, there is known a volume control device capable of instantly setting a volume control to a maximum value or a minimum value in a test mode for volume control (see Japanese Patent Application Laid-Open No. 5-206767). This signal is transmitted to a television receiver by a television signal or C signal.
The control circuit is applied to a CATV home terminal that outputs an ATV signal. When the test mode instructing unit instructs the control circuit of the main unit to execute the test mode and instructs the control circuit to increase or decrease the volume, the control circuit operates as follows. The maximum volume setting unit or the minimum volume setting unit is driven so that the volume adjustment of the main body is instantaneously set to the maximum or the minimum. Therefore, when inspecting the volume adjustment function of the home terminal in a mass production line, the volume can be instantaneously maximized or minimized by operating the volume up / down keys, so that the inspection time for the volume adjustment can be greatly reduced. .

[0003]

By the way, the above-mentioned conventional volume control device has an advantage that it does not require several seconds for the test of the volume control function. Is not configured to stop
There was a drawback that the problem of noise associated with the generation of high-pitched sounds could not be prevented. For example, when a child is watching a broadcast program on a television receiver, the user often leaves the room with the volume at a maximum by operating a remote control and leaves the room unattended. Then, since a high-pitched sound is continuously emitted from the speaker, noises are scattered around, and there is a problem that the neighborhood is inconvenienced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to provide a television receiver capable of temporarily shutting off a power supply side when a sound is emitted from a speaker at a high pitch, thereby preventing a problem of noise generation. It is intended to provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, an audio signal having a level corresponding to an adjustment amount of a volume adjustment unit is output from an audio signal output unit to a speaker side. When the level of the audio signal output from the audio signal output unit reaches a predetermined level, a voltage is supplied to the load side including the audio signal output unit. And a control unit for performing control to cut off the output voltage of the power supply unit. The invention according to claim 2 further includes a memory having a data table in which the level of the audio signal and the time data are set opposite to each other, and the control means starts counting the passage of time in response to the audio signal. In addition, the level of the input audio signal is compared with the time data according to the data table of the memory, and when the audio signal reaches a predetermined level within a predetermined time, the power supply unit is shut off. According to a third aspect of the present invention, when the voltage supply from the power supply unit to the load side is restarted, the control unit outputs an audio signal at a level lower than the set level or within the predetermined level. Features.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an electric configuration of a television receiver according to the present invention. This television receiver is of a general popular type, and includes an audio signal output unit 7, a power supply circuit 10, and a control unit 1.
5 and the like, and a television broadcast program is projected on a screen of a CRT (CRT) 5 by operating a key input unit of a receiver main body or a remote controller (remote controller) 11 (not shown), and sound is emitted from a speaker 8. It has become. Reference numeral 1 denotes a tuner to which a television signal received by an antenna is guided. The tuner 1 has an output connected to the reception circuit unit 2 and a control unit 15 connected thereto. Then, based on the channel selection signal from the control unit 15, a specific broadcast station is selected, and a signal of the channel is transmitted to the reception circuit unit 2.

The receiving circuit section 2 includes a Y / C / A separating circuit 3 and is connected to a video signal processing section 4 and an audio signal processing section 5. , And sends the video signal to the video signal processing unit 4 and the audio signal to the audio signal processing unit 6, respectively. The video signal processing unit 4 includes a chroma IC 4a, and is connected to a CRT (CRT) 5 via a deflection circuit and an image processing circuit (not shown). The chroma IC 4a is bidirectionally connected to the control unit 15. The audio signal processing unit 6 includes a stereo IC 6a, and the output is connected to the speaker 8 via the audio signal output unit 7. The stereo IC 6 a is bidirectionally connected to the control unit 15, and the output of the control unit 15 is guided to the audio signal output unit 7. Thus, the audio signal output unit 7 can change the level of the output signal of the stereo IC 6a according to the control signal from the control unit 15, and can adjust the sound emission volume of the speaker 8.

The power supply circuit 10 has a plug IC 9 connected to the input side and a chroma IC 4a of the video signal processing unit 4 and a stereo IC 4
6a, an audio signal output unit 7, and other circuit components are connected. In the power supply circuit 10, when the insertion plug 9 is plugged into an outlet, an AC commercial voltage is introduced, so that DC voltages of different levels can be supplied to the respective parts of the circuit.
The power supply circuit 10 includes a normally closed switch to which a control signal from the control unit 15 is guided.
When the off control signal is sent from 5, the circuit is opened, and the supply of voltage to each part of the circuit is stopped. On the other hand, when the power supply circuit 10 is turned on, the power supply circuit 10 is closed, and the supply of voltage to each section of the circuit is restarted.

[0009] The remote controller 11 has a power-on /
In addition to main operation keys such as an off power key, a channel selection channel key, and a volume adjustment up / down key, various function keys are provided. When any key of the key operation unit is operated, a command signal corresponding to the input operation is transmitted as an infrared signal. A receiving unit 12 receives an infrared signal transmitted from the remote controller 11 and transmits a transmission signal to the control unit 15.
Send to the side.

Reference numeral 13 denotes a memory, and reference numeral 14 denotes a timer for counting, which constitutes a control unit 15 together with a counter (not shown). The memory 13 has a data table input in advance to determine the timing of turning off the supply voltage from the power supply circuit 10 to each circuit. This data table is a set of data in which the level of the audio signal output from the audio signal output unit 7 to the speaker 8 and the time elapsed since the output of the audio signal was started.
Although these data are not shown, a matrix in which time data in units of 0 to 1 second are arranged in the vertical direction and voltage values of audio signals corresponding to the decibels of the sound emitted from the speaker 8 are arranged in the horizontal direction. The combination of each time data and audio signal data is set so that the off timing of the supply voltage is optimal.

The control unit 15 is a microcomputer for controlling the operation of the whole television, and is connected in one direction or bidirectionally according to the functions of the load-side circuits and their functions. The control unit 15 receives the ON command signal from the remote controller 11, turns on the power supply circuit 10, supplies a required voltage to each unit of the circuit, starts displaying a television broadcast program, and then outputs an audio signal from the stereo IC 6a. Then, the counting of the elapsed time is started. Then, the level of the input audio signal is compared with the time data according to the data table of the memory 13, and when the audio signal reaches a predetermined level within a predetermined time, the power supply circuit 10 is turned off. When is turned on again, control is performed to output an audio signal based on the data in the memory 13.

Next, the operation of the television receiver will be described with reference to the flowchart of FIG. When the user turns on the power key with the key operation unit of the remote controller 11, the control unit 15 sends a tuning signal of a channel selected in advance to the tuner 1. Then, the television signal of the selected channel is guided to the reception circuit unit 2 and separated into a video signal and an audio signal by the Y / C / A separation circuit 3. Then, the video signal is sent to the chroma IC 4a side,
The audio signal is transmitted to the stereo IC 6a.
Therefore, at the same time as the video of the broadcast program is displayed on the screen of the CRT 5, the sound is emitted from the speaker 8 at the previously set audio signal level. As described above, when the display of the television broadcast is started, the control unit 15 controls the stereo IC 6
Receiving the audio signal from a, the level of the audio signal is compared with the audio signal data stored in the memory 13 in advance, and it is determined whether or not the volume has been increased (step S11).

If the volume is not increased, the process ends without entering the operation for adjusting the volume. However, when a command signal for increasing the volume is transmitted from the remote controller 11, the data of the current audio level is transmitted at that time. Memorize (Step S1
2). At this time, the previous audio data stored in the memory 13 is updated, but this data has the same value. Further, the control unit 15 starts counting time with a counter (step S13), and compares the time data in units of one second and the data of the audio signal whose level is gradually increased with the data table of the memory 13 (step S14). And
In order to monitor the sound emission from the speaker 8 due to the operation of the volume adjustment key, it is determined every several seconds whether or not the sound level indicates a high tone (step S15). Here, when the sound level does not reach the predetermined sound level within the predetermined time, the process ends without entering the operation for adjusting the sound volume. Send a signal.

Therefore, the power supply circuit 10 is turned off, and the output voltage supplied to each part of the circuit on the load side is cut off (step S16). As a result, the video of the broadcast program is not displayed on the screen of the CRT 5, and the sound emission from the speaker 8 is stopped. Therefore, even if the user's child is watching a broadcast program on the television receiver, the user may leave the room with the volume at the maximum by mischievous operation of the remote control or leave the room unattended. Since the sound is cut off and the sound emission is stopped, there is no problem that noise is scattered around. Thereafter, when the power key is turned on by the key operation unit of the remote controller 11, the control unit 15
It is determined that the voltage supply from 0 has been restarted (step S1).
7) A control signal is sent to the audio signal output unit 7 based on the audio data stored in the memory 13. As a result, the sound is emitted from the speaker 8 at a low volume before the volume is increased, so that the user can view the broadcast program at a normal audio level.

[0015]

As described above, according to the first aspect of the present invention, if the level of the audio signal output from the audio signal output unit is set to a high value in advance, for example, When the speaker is left with the operation of raising the volume, the output voltage of the power supply section is cut off and the sound emission of the speaker stops immediately, so that it does not disturb the surroundings due to high noise and also prevents wasteful power consumption There is an effect that can be done. According to the second aspect of the present invention, the level of the input audio signal is compared with the time data according to the data table in the memory, and when the audio signal reaches a predetermined level within a predetermined time, the power supply unit is shut off. There is an advantage that the sound emission of the speaker can be stopped when the volume is suddenly increased due to mischief or the like, unlike the case of adjusting the volume. Further, according to the third aspect of the present invention, when the voltage supply from the power supply unit to the load side is restarted, the audio signal is output at a level equal to or lower than the previous set value or within a predetermined level. When the power is turned on again after the power is turned off, there is an advantage that sound can be emitted with a normal level sound from the speaker.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a television receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining a volume adjustment operation of the television receiver.

[Explanation of symbols]

 7 audio signal output section 8 speaker 11 volume control section 10 power supply section 15 control means

Claims (3)

[Claims] 1. A television receiver for outputting an audio signal having a level corresponding to an adjustment amount of a volume adjustment unit from an audio signal output unit to a speaker to emit sound, wherein the audio signal is output from the audio signal output unit. A television, comprising: a control unit for performing control to cut off an output voltage of a power supply unit that supplies a voltage to a load including the audio signal output unit when a level of the audio signal reaches a preset level. Receiver. 2. A memory having a data table in which the level of the audio signal and the time data are set opposite to each other, wherein the control means receives the audio signal, starts counting time, and stores the data in the memory. 2. The television receiver according to claim 1, wherein the level of the input audio signal is compared with time data according to a data table, and when the audio signal reaches a predetermined level within a predetermined time, the power supply unit is turned off. Machine. 3. The controller according to claim 1, wherein when the voltage supply from the power supply section to the load side is restarted, the control means outputs an audio signal at a level lower than the set level or within the predetermined level. Or the television receiver according to 2.