JP5779892B2 - Video and audio output device - Google Patents

Description

The present invention relates to a video and audio output device, and more particularly to a video and audio output device having a function of supplying a video signal and / or an audio signal to an external input terminal of a television receiver.

  Recently, there has been provided a bathroom television system that can watch television broadcasts in the bathroom while bathing (see Patent Document 1).

  In this type of bathroom television system, the television receiver has a tuner unit a that receives television broadcasts and a monitor unit b that displays the television broadcasts received by the tuner unit a so that they can be viewed. As shown in FIG. 5, the tuner part a is arranged outside the bathroom, such as the back of the bathroom, and the monitor part b is arranged on the wall surface of the bathroom. You can watch John Broadcasting. Reference numeral d in FIG. 5 indicates a multi-core cable that connects the tuner unit a and the monitor unit b. The video displayed on the monitor unit b and the audio output from the monitor unit b are transmitted via the cable d. The tuner unit a provides an electrical signal to the monitor unit b.

  By the way, such bathroom television systems started to spread when television broadcasting was broadcasted in an analog manner, so that many of the existing bathroom television systems have an analog television broadcasting with a tuner section a. Only digital television broadcasts cannot be received.

  For this reason, in such an existing bathroom television system, a method of using an external input function provided in a television receiver (tuner unit a) has been proposed in order to enable viewing of digital television broadcasts. ing. In this method, a tuner e corresponding to a digital television broadcast is prepared separately from the tuner unit a, and the digital television broadcast received by the tuner e is transmitted to an external input terminal (external video) of the tuner unit a. Input terminal and external audio input terminal), so that a digital television broadcast can be viewed on the monitor b.

  In this case, the tuner e is provided with a receiving unit (not shown) for receiving a remote operation signal (for example, an infrared signal) from the remote controller f, and turning on / off the tuner e and selecting a television station to receive. Etc. can be performed from this remote control f.

JP 2009-10801 A

  However, such conventional methods have the following problems, and improvements have been desired.

  That is, in the method of viewing digital television broadcasting using the external input function of the television receiver in this way, when the power-off operation is performed on the tuner section a before the power-off operation of the tuner e is performed, As a result, the screen display of the monitor unit b disappears, and the user may forget to turn off the tuner e.

  As a countermeasure against such forgetting to turn off the power, for example, the power on / off state of the tuner e is displayed so as to be visible to the user, that is, the display is alerted to the user to prevent forgetting to turn off the power. However, even in this case, the power on / off operation for the tuner e is left to the user's operation, and therefore it is impossible to completely prevent the tuner e from forgetting to turn off the power.

  It should be noted that such forgetting to turn off the power (forgetting to turn off the power due to the display on the monitor b disappearing) is not limited to the case where the device connected to the external input is the tuner e. Similarly, when a device for supplying video or audio to an external input of a television receiver (hereinafter, these are collectively referred to as “video output device”) such as a radio receiver is connected. It was a possible problem and a solution was desired.

The present invention has been made in view of such problems, and its purpose is to connect to an external input of a television receiver without changing the configuration of the existing television receiver. It is an object of the present invention to provide a video and audio output device that does not forget to turn off the power when the power is turned off.

To achieve the above object, the output device of the video and audio according to claim 1 of the present invention, the output of the video and audio having a function of supplying a video signal and an audio signal to the external input terminal of the television receiver In the apparatus, input means for inputting a signal output from the external audio output terminal of the television receiver, and energization of the video and audio output apparatus is controlled based on the signal input to the input means. The energization control means for performing the operation, the input means comprising: a predetermined input terminal; a filter circuit for removing noise other than an audio signal from a signal input to the input terminal; and a signal from which noise has been removed by the filter circuit And an amplitude limiting circuit for limiting the amplitude of the signal amplified by the amplifier circuit so that it does not exceed a predetermined voltage range. When a commercial power source is connected to the video and audio output device and power is supplied to the microcomputer, the microcomputer monitors the voltage input to the microcomputer from the amplitude limiting circuit, and the input voltage Is determined to be equal to or lower than a predetermined level set in advance, and if the determination is negative, the control of the energization is enabled while the determination is positive for a predetermined time. In such a case, a configuration is provided in which the energization control is not performed .

  According to the first aspect of the present invention, the external audio output terminal provided in the television receiver outputs a sound or noise-like signal when the power of the television receiver is on, whereas the television receiver By utilizing the fact that no signal is output when the power of the receiver is off, the power state of the television receiver is determined from the external audio output of the television receiver, and the result of the determination (the television receiver) The power supply of the output device such as an image is controlled in accordance with the state of the power source.

Specifically, the video and audio output device according to claim 1 is provided with input means for capturing a signal output from the external audio output terminal of the television receiver, and this input means is provided outside the television receiver. Connected to audio output terminal. The energization control means monitors the signal input to the input means (the signal output from the external audio output of the television receiver), thereby turning on or off the power of the television receiver. And the energization of the video and audio output device is controlled according to the power state of the television receiver. Therefore, for example, when the power of the television receiver is turned off, the energization is controlled so that the power consumed by the video and audio output device is reduced as the power is turned off (for example, video and audio ). It is possible to control energization corresponding to the power-off operation of the audio output device.
In addition, since the signal input to the input terminal is amplified with the noise other than the audio signal removed by the filter circuit and input to the energization control means, the signal output from the external audio output terminal of the television receiver is Even when the signal is small, it is possible to reliably capture the signal, and it is possible to prevent the energization control from being erroneously performed when the signal output from the external audio output terminal of the television receiver is small.

Further, the output device of the video and audio according to claim 2 of the present invention, the output device of the video and audio according to claim 1, the control of the energization by the energizing control means, said video and audio output devices This is performed by opening and closing a switch provided on a predetermined power line.

That is, in the invention according to claim 2, since energization control in the video and audio output device is performed by opening and closing a switch provided on a predetermined power line, when the power of the television receiver is turned off. By providing this switch on the power supply line of the circuit that may be cut off, the power supply to the circuit is cut off when the television receiver is turned off, and the power consumption in the video and audio output device Can be suppressed.

Further, the output device of the video and audio according to claim 3 of the present invention is the output device of the video and audio according to claim 2, said power supply control means, the signal is silent state which is input to the input means The switch is configured to be opened on condition that

  That is, in the invention according to claim 3, since the energization control means is configured to open the switch when the signal input to the input means indicates a silence state, the power supply of the television receiver is When it is off, power supply to the circuit in which the switch is arranged is cut off, and power consumption is suppressed.

Further, the output device of the video and audio according to claim 4 of the present invention, the output device of the video and audio according to claim 2 or 3, the power supply lines the switch is provided, of the video and audio The output device is characterized in that it is provided on a power supply line for supplying power to circuits other than at least the input means and the energization control means.

That is, in the invention according to the fourth aspect , since the switch is provided on the power supply line that supplies power to a circuit other than the energization control means, power is always supplied to the energization control means. Therefore, the energization control means is in a state where it can perform control to restore energization by closing the switch at any time.

Further, the output device of the video and audio according to claim 5 of the present invention, the output device of the video and audio according to any one of claims 1 to 4, the television receiver receives a television broadcast The tuner unit and the monitor unit for viewing the television broadcast received by the tuner unit are configured separately, and the monitor unit is disposed in the bathroom and the tuner unit is disposed outside the bathroom. It is set as the structure made into.

The video and audio output device according to claim 6 of the present invention, in the output device of the video and audio according to any one of claims 1 to 5, the output device of the video and audio, the digital It is a tuner for receiving a television broadcast.

According to the present invention, a video and audio output device having a function of supplying a video signal and an audio signal to an external input terminal of a television receiver is a signal output from the external audio output terminal of the television receiver. And an energization control unit for controlling energization of the video and audio output device based on a signal input to the input unit. Is turned off, the video and audio output device can perform the same energization control as when the video and audio output device is turned off to output video and audio . Forgetting to turn off the power of the apparatus can be prevented.

In addition, since the energization control in the video and audio output device is performed using the external audio output of the television receiver, the video and audio output device is not changed without changing the existing television receiver. Since it is realized simply by connecting the input means and the external audio output terminal of the television receiver, it can be realized at low cost without replacing the television receiver.

It is a block diagram which shows schematic structure which applied the video and audio | voice output apparatus which concerns on this invention to the bathroom television system. It is a block diagram which shows schematic structure of the input means and electricity supply control means in the output device of the image | video and an audio | voice . It is a flowchart which shows an example of the procedure of the power-off forgetting prevention control in the video and audio | voice output apparatus. It is a flowchart which shows another example of the procedure of the power-off forgetting prevention control in the output device of the same video and audio . It is a block diagram which shows schematic structure of the conventional bathroom television system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
The video and audio output device according to the present invention (hereinafter referred to as “video output device”) has a function of supplying a video signal and / or an audio signal to an external input terminal of a television receiver . In this embodiment, a case will be described in which a tuner device (digital tuner unit) that receives a digital television broadcast is used as the output device for video and the like.

  FIG. 1 shows a schematic configuration of a bathroom television system 2 provided with the digital tuner unit 1.

  First, the bathroom television system 2 will be described. The bathroom television system 2 is a television receiver system (television receiver) for enabling viewing of an analog television broadcast in the bathroom. As shown in FIG. 1, an analog tuner unit 3 and a monitor are provided. The unit 4 and the multi-core cable 5 connecting them are configured as main parts. The analog tuner unit 3 and the monitor unit 4 are housed in different housings and configured separately, and the analog tuner unit 3 is provided outside the bathroom (for example, behind the ceiling of the bathroom), and the monitor unit. 4 are respectively arranged in the bathroom (for example, bathroom wall surface).

  The analog tuner unit 3 is a tuner unit for receiving an analog television broadcast. The analog tuner unit 3 includes an electric circuit (analog reception circuit) necessary for receiving the analog television broadcast. ), And a power supply circuit (not shown) for supplying power to each part of the bathroom television system by receiving power from a commercial power source (not shown).

  The analog tuner unit 3 is switched between an external input terminal for inputting video and audio signals from the outside and a video broadcast and audio signal input from the television broadcast received by the analog receiving circuit or the external input terminal. A monitor connection terminal for supplying to the monitor unit 4 and a television broadcast received by the analog reception circuit or an audio signal input from the external input terminal is supplied to an external device (for example, an audio amplifier). And an external audio output terminal (both not shown).

  The analog tuner unit 3 includes video and audio signals output from the analog receiving circuit and video and audio signals provided from the external input terminal as video and audio signals output from the monitor connection terminal. Switch circuit for selecting which one of the signals to be output is provided, and this switch circuit selects a video and audio signal output from the monitor connection terminal based on an input switching signal described later. .

  The external audio output terminal is configured to output the same audio signal as the audio signal output from the monitor connection terminal (source audio signal set by the input switching signal). When a television broadcast audio signal received by an analog receiver circuit is output from the connection terminal, the television broadcast audio signal is output from the monitor connection terminal. In this case, the audio signal input from the external input terminal is output from the external audio output terminal.

  Further, the external audio output terminal is configured to output an audio signal without being interlocked with volume adjustment in an operation unit of the monitor unit described later. Therefore, when the bathroom television system is turned on (in other words, when the analog tuner unit 3 is turned on), the analog reception circuit receives the signal from the external audio output terminal. Either a television broadcast audio signal or an audio signal input from an external input terminal is output.

  The monitor unit 4 is a monitor unit for displaying a video signal supplied from the analog tuner unit 3. The monitor unit 4 can display a video signal as an image and an audio signal. Various kinds of settings such as a sound output unit that outputs as sound (sound), volume adjustment of the sound output unit, selection of a broadcast station that is received by the analog tuner unit 3, and setting of an input switching signal to be given to the analog tuner unit 3 And an operation unit for performing a setting operation.

  The cable 5 includes a video and audio signal cable for supplying the video and audio signals supplied from the monitor connection terminal of the analog tuner unit 3 to the monitor unit 4, and the analog tuner unit 3 and the monitor unit 4. Including a cable for transmitting and receiving various control signals (including the input switching signal) exchanged with the computer. In the present embodiment, the power of the monitor unit 4 is supplied from the analog tuner unit 3 while being superimposed on a cable that exchanges control signals.

  The digital tuner unit 1 is used to enable viewing of a digital television broadcast in a television receiver (in the present embodiment, the bathroom television system 2 in this embodiment) provided with a tuner that receives an analog television broadcast. An analog circuit unit 3 which is an apparatus for receiving an electric circuit (digital receiving circuit) necessary for receiving a digital television broadcast and a television broadcast (video signal and audio signal) received by the digital receiving circuit. The external output terminal (not shown) for supplying to the external input terminal of the analog tuner unit 3 is connected to the external input terminal of the analog tuner unit 3 via the cable 6. The digital tuner unit 1 includes an internal power source 16 (see FIG. 2) that receives power from a commercial power source (not shown). Each part of the digital tuner unit 1 receives power from the internal power source 16. It is configured.

  The video and audio signals supplied from the external input terminal are selected as the video and audio signals output from the monitor connection terminal of the analog tuner unit 3 according to the setting of the operation unit of the monitor unit 4 (input switching signal). Thus, the television broadcast received by the digital tuner unit 1 can be viewed on the monitor unit 4 via the analog tuner unit 3.

  In addition to these components, the digital tuner unit 1 shown in the present embodiment includes an input unit for inputting a signal output from the external audio output terminal of the analog tuner unit 3, and a signal input to the input unit. And an energization control means for controlling energization of the digital tuner unit 1.

  FIG. 2 shows a schematic configuration of these input means and energization control means. As shown in FIG. 2, the digital tuner unit 1 includes, as the input means, a predetermined input terminal 10 and a filter circuit 11 that removes noise other than an audio signal from a signal input to the input terminal 10; An amplifying circuit 12 that amplifies the signal from which noise has been removed by the filter circuit 11 and an amplitude limiting circuit 13 that limits the amplitude of the signal amplified by the amplifying circuit 12 so as not to exceed a predetermined voltage range. A microcomputer 14 and a switch 15 are provided as the energization control means.

  Here, the input terminal 10 is a terminal for inputting a signal output from the external audio output terminal of the analog tuner unit 3, and the input terminal 10 is connected to the outside of the analog tuner unit 3 via the cable 7. Connected to the audio output terminal (see FIG. 1). Therefore, when the analog tuner unit 3 is in a power-on state, either the audio signal received by the analog receiving circuit or the audio signal input from the external input terminal is input to the input terminal 10. It becomes.

  The signal input to the input terminal 10 is subjected to removal of signals other than the audio signal by the filter circuit 11, and a small audio signal is amplified to a level detectable by the microcomputer 14 by the amplifier circuit 12. The amplitude is limited by the amplitude limiting circuit 13 so that the microcomputer 14 is not damaged by the amplified signal, and then input to the A / D input circuit of the microcomputer 14. With such a configuration, when the signal output from the external audio output terminal of the analog tuner unit 3 is not an audio signal, the signal is removed by the filter circuit 11, so that the microcomputer 14 is prevented from being erroneously handled as an audio signal. Is done. Even if the signal output from the external audio output terminal is a small audio signal that is almost inaudible, it is amplified by the amplifier circuit 12, so that the microcomputer 14 can reliably detect the audio signal.

  The microcomputer 14 is composed of a microcomputer provided with the A / D input circuit, and the voltage (digital conversion value) of the audio signal supplied through the input means described above is set to a predetermined level ( Based on whether or not the predetermined voltage range) X or less, it is determined whether the power supply of the analog tuner unit 3 is in an off state or an on state, and depending on the determination result These are programmed to perform energization control described later (details will be described later).

  The switch 15 includes an open / close switch whose contact opening / closing is controlled by the microcomputer 14. The switch 15 is disposed in a predetermined power line 17 among power lines provided for supplying power from the internal power circuit 16 to the electric circuit in the digital tuner unit 1. The microcomputer 14 performs control to open the contact of the switch 15 so that the power supply (energization) to the electric circuit connected to the power line 17 provided with the switch 15 is cut off. It has become.

  More specifically, the switch 15 is provided on a power supply line that supplies power to an electric circuit that may cut off the power supply when the analog tuner unit 3 is powered off. In other words, the switch 15 includes a circuit (for example, the filter circuit 11, the amplifier circuit 12, the amplitude limiting circuit 13, and the microcomputer 14) necessary for controlling the opening / closing of the switch 15, and the digital tuner unit 1. When there is a remote control (not shown) for remotely operating the power supply line connected to an electric circuit other than a receiving circuit (for example, an infrared receiving circuit) 18 for receiving a remote control signal from the remote control Can be prepared.

  When there are a plurality of electrical circuits that may cut off the power supply when the power of the analog tuner unit 3 is off, a plurality of switches 15 are provided according to the power supply lines of the electrical circuits. Alternatively, by providing a large number of switches 15, the power saving effect when the switches 15 are opened can be enhanced.

  Therefore, the power-off forgetting prevention control in the digital tuner unit 1 configured as described above will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the procedure of the power-off-forgetting prevention control in the digital tuner unit 1.

  As shown in FIG. 3, when the commercial power supply is connected to the digital tuner unit 1, the microcomputer 14 of the digital tuner unit 1 initializes the microcomputer 14 (see step S1 in FIG. 3), and then the digital tuner. When the power of the unit 1 is turned on, the voltage input from the amplitude limiting circuit 13 to the microcomputer 14 is monitored to determine whether or not the input voltage is below a predetermined level X set in advance (FIG. (See 3 step S2).

  Here, the process of step S2 in FIG. 3 is a process of determining whether the power of the analog tuner unit 3 is turned on or off.

  That is, as described above, when the power of the analog tuner unit 3 is on, the external audio output terminal of the analog tuner unit 3 is an audio signal of a television broadcast received by the analog receiving circuit, Alternatively, any one of the audio signals input to the external input terminal of the analog tuner unit 3 is output. In this case, a voltage corresponding to the audio signal is input to the microcomputer 14. On the other hand, when the analog tuner unit 3 is powered off, no signal is output from the external audio output terminal of the analog tuner unit 3, and the signal input to the input means indicates a silent state. (Theoretical input voltage becomes 0V).

  Therefore, the microcomputer 14 determines whether the power of the analog tuner unit 3 is on or off by utilizing the characteristics of the signal output from the external audio output terminal of the analog tuner unit 3 (that is, the input means described above). The analog tuner unit 3 is determined to be turned off when the signal input to the receiver is silent, and the analog tuner unit 3 is determined to be turned on when the silent state is not indicated). The predetermined level X is set as a threshold for this determination. Note that the predetermined level X does not necessarily have to be set corresponding to the voltage 0 V as long as it can be determined that there is no sound by the above-described method, and can be set as appropriate.

  If the determination in step S2 in FIG. 3 is negative, the microcomputer 14 determines that the power supply of the analog tuner unit 3 is in the on state, returns to step S1 in FIG. When (Ym seconds in the illustrated example) elapses, the determination in step S2 in FIG. 3 is performed again.

On the other hand, when the determination in step S2 of FIG. 3 is affirmative, the microcomputer 14 adds (increments) the count of a timer (timer) provided in the microcomputer 14 (see step S3 of FIG. 3), It is determined whether a predetermined time (in the illustrated example, Z minutes) has elapsed when the level of the audio signal input to the microcomputer 14 is X or less (see step S4 in FIG. 3).

  If the determination in step S4 in FIG. 3 is affirmative, that is, if the signal output from the external audio output terminal of the analog tuner unit 3 continues the silent state for the predetermined time (Z minutes), The microcomputer 14 determines (determines) that the power of the analog tuner unit 3 is turned off, and executes power-off control for opening the switch 15 (see step S5 in FIG. 3).

  As a result, power supply to the electric circuit connected to the power line 17 provided with the switch 15 is cut off, the digital tuner unit 1 is turned off, and the analog tuner unit 3 is turned off. Forgetting to turn off the digital tuner unit 1 is prevented.

  On the other hand, if the determination in step S4 in FIG. 3 is negative, the microcomputer 14 returns to step S2 in FIG. 3 and performs the above-described operation. In the present embodiment, the microcomputer 14 determines that the power of the analog tuner unit 3 is turned off under the condition that the determination in step S2 in FIG. 3 has been positive for a predetermined time (Z minutes). If the determination in step S2 in FIG. 3 is affirmative, it is also possible to configure to move to the processing in step S5 in FIG. 3 immediately.

  As described above, the digital tuner unit 1 shown in the present embodiment captures a signal output from the external audio output terminal of the analog tuner unit (television receiver) 3 and monitors the signal to thereby monitor the analog tuner unit. 3 is turned on / off, and the energization of the digital tuner unit 1 is controlled according to the state of the power supply. Therefore, when the power of the analog tuner unit 3 is turned off, Forgetting to turn off the power of the digital tuner unit 1 can be solved.

  In addition, since the control of energization by the microcomputer 14 uses the external audio output of the analog tuner unit 3, it can be changed to an existing bathroom television system as long as the analog tuner unit 3 has an external audio output terminal ( Therefore, it is possible to prevent the digital tuner unit 1 from being forgotten to be turned off at a low cost.

Embodiment 2
Next, another embodiment of the present invention will be described with reference to FIG.
The digital tuner unit 1 shown in the present embodiment is a modified example of the digital tuner unit 1 shown in the first embodiment. Specifically, for example, when the digital tuner unit 1 is installed, the digital tuner unit 1 and the analog tuner unit 1 are analog. Even in a situation where an audio signal is not input to the input means of the digital tuner unit 1 even when the power of the analog tuner unit 3 is turned on, as in the case where the cable 7 for connecting to the tuner unit 3 is not connected, the digital tuner The control configuration of the microcomputer 14 is modified so that the unit 1 does not mistakenly determine that the power of the analog tuner unit 3 is off. Therefore, since the other configuration is the same as that of the above-described first embodiment, the parts having the same configuration are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 is a flowchart showing a modified example of the procedure of the power-off-forgetting prevention control in the digital tuner unit 1. As shown in FIG. 4, in the digital tuner unit 1 shown in the present embodiment, the microcomputer 14 initializes the microcomputer 14 when a commercial power source is connected to the digital tuner unit 1 (see step S1 in FIG. 4). Then, when the power supply of the digital tuner unit 1 is turned on (see step S2 in FIG. 4), the voltage input from the amplitude limiting circuit 13 to the microcomputer 14 is monitored, and the input voltage is set to a predetermined value. It is determined whether or not it is below level X (see step S3 in FIG. 4). These processes are the same as those in the first embodiment.

  If the determination in step S3 in FIG. 4 is negative, the microcomputer 14 is normally given an input signal, so the microcomputer 14 connects the digital tuner unit 1 and the analog tuner unit 3. The cable 7 to be connected is determined to be normally connected (constructed) (see step S8 in FIG. 4), and the above-mentioned control for forgetting to turn off the digital tuner unit 1 is enabled (see step S9 in FIG. 4). Thereafter, the control for forgetting to turn off the power is performed in the same procedure as that of the first embodiment (the procedure shown in FIG. 3).

  On the other hand, if the determination in step S3 in FIG. 4 is affirmative, the microcomputer 14 does not determine that the cable 7 is normally connected (constructed), and the timer (time count) provided in the microcomputer 14 is not determined. Means) is added (incremented) (see step S4 in FIG. 4), and it is determined whether a state where the level of the audio signal input to the microcomputer 14 is X or less has elapsed for a predetermined time (Z minutes in the illustrated example) (see FIG. 4). (See step S5 in FIG. 4).

  If the determination in step S5 in FIG. 4 is affirmative, that is, if the signal output from the external audio output terminal of the analog tuner unit 3 continues the silent state for the predetermined time (Z minutes), the microcomputer 14, it is determined that the cable 7 is not normally connected (constructed), and thereafter, the control for forgetting to turn off the power of the digital tuner unit 1 as described in the first embodiment is not performed. (Disable the control).

  That is, when constructing this type of digital tuner unit 1, it is common to test whether the television broadcast received first by the digital tuner unit 1 is normally displayed on the monitor unit 4. In the present embodiment, when the microcomputer 14 cannot detect that the power of the analog tuner unit 3 is turned on at the time of this test, it is determined that the cable 7 is not properly installed.

  Therefore, in this embodiment, when the cable 7 that connects the digital tuner unit 1 and the analog tuner unit 3 is not normally connected (constructed), the microcomputer 14 performs the control to forget to turn off the power of the digital tuner unit 1. This prevents the microcomputer 14 from erroneously executing the power-off control of the digital tuner unit 1. Therefore, for example, when the user refuses the installation of the cable 7, it is possible to prevent the digital tuner unit 1 from being turned off arbitrarily.

  The above-described embodiments show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope of the invention.

  For example, in the above-described embodiment, the case where the present invention is applied to the digital tuner unit 1 additionally connected to the bathroom television system 2 including the analog tuner unit 3 has been described. Any device other than the digital tuner unit 1 described above can be applied as long as it is an image output device having a function of supplying a video signal and / or an audio signal to the input terminal. Specifically, as an apparatus for providing both video and audio signals to a television receiver, for example, an apparatus that can be applied to a DVD player, a hard disk device, etc., and that provides only a video signal to a television receiver. For example, it can be applied to a photo frame. Furthermore, as an apparatus that provides only a sound signal to a television receiver, for example, it can be applied to a radio receiver, a digital audio player, and the like.

  In the above-described embodiment, the case where the power-off-forgetting prevention control in the digital tuner unit 1 is automatically performed has been described. However, the selection of whether to perform this control can be left to the user setting. In that case, the digital tuner unit 1 is provided with operation means for setting the microcomputer 14 as to whether or not to execute the control.

1 Digital tuner unit (video output device)
2 Bathroom TV system (TV receiver)
3 Analog tuner unit (tuner part)
4 Monitor unit (monitor unit)
5, 6, 7 Cable 10 Input terminal (input means)
11 Filter circuit (input means)
12 Amplifier circuit (input means)
13 Amplitude limiting circuit (input means)
14 Microcomputer (energization control means)
15 Switch (energization control means)
16 Internal power circuit

Claims (6)

In a video and audio output device having a function of supplying a video signal and an audio signal to an external input terminal of a television receiver,
Input means for inputting a signal output from an external audio output terminal of the television receiver, and energization control for controlling energization of the video and audio output device based on the signal input to the input means Means and
The input means includes a predetermined input terminal, a filter circuit that removes noise other than an audio signal from a signal input to the input terminal, an amplifier circuit that amplifies a signal from which noise has been removed by the filter circuit, An amplitude limiting circuit that limits the amplitude of the signal amplified by the amplifier circuit so as not to exceed a predetermined voltage range,
The energization control means includes a microcomputer, which monitors the voltage input to the microcomputer from the amplitude limiter circuit when a commercial power source is connected to the video and audio output device and power is supplied to the microcomputer. Determining whether or not the input voltage is equal to or lower than a predetermined level set in advance, and if the determination is negative, the control of the energization is enabled while the determination is affirmative. Is provided with a configuration in which the energization control is not performed when the operation continues for a predetermined time.   2. The video and audio output device according to claim 1, wherein the energization control by the energization control means is performed by opening and closing a switch provided on a predetermined power line in the video and audio output device. .   3. The video and audio according to claim 2, wherein the energization control unit is configured to open the switch on condition that a signal input to the input unit indicates a silent state. Output device.   The power supply line provided with the switch is provided in a power supply line for supplying power to at least a circuit other than the input means and the energization control means in the video and audio output device. The video and audio output device according to 2 or 3. In the television receiver, a tuner unit for receiving a television broadcast and a monitor unit for viewing the television broadcast received by the tuner unit are configured separately.
Together with the monitoring unit is arranged in the bathroom, the output of the video and audio according to any one of claims 1 to 4, wherein the tuner unit is characterized in that it is configured to be located outside the bathroom apparatus.   6. The video and audio output device according to claim 1, wherein the video and audio output device is a tuner for receiving a digital television broadcast.

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