JP3334209B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver in which various processes for video signals and audio signals are controlled by a microcomputer or the like via a control bus. .

[0002]

2. Description of the Related Art In recent television receivers, a main microcomputer and a circuit section having various functions are connected by a control bus which is a common path for exchanging signals (such as data). Various operations, adjustments, and the like are being performed by control signals transmitted through the control unit.

FIG. 4 is a partial circuit block diagram of a television receiver in which various controls are performed by a control bus. In this figure, 16 is a BS antenna for receiving a BS broadcast, 17 is a CS antenna for receiving a CS broadcast, 18 is a U / V antenna for receiving a terrestrial broadcast, and mixes signals received by these antennas. The mixers 19 are provided outside the television receiver together with the mixers 19. The signal passed through the mixer 19 is distributed by the distributor 20 into a terrestrial broadcast signal and a BS / CS broadcast signal.

[0004] 1 is a U / V tuner for selecting terrestrial broadcasting via a distributor 20, and 2 is a BS / C via a distributor 20
BS / CS tuner for selecting S broadcast, 3 for BS / CS
A decoder unit 4 for decoding the received radio wave selected by the tuner 2 is an AV switch, and a U / V tuner 1, a BS / CS tuner 2, an external input terminal t ₁ ,
A signal input from t ₂ and t ₃ is selected, and a video signal, an audio signal, and a synchronization signal are output for the selected signal.

[0005] Reference numeral 5 denotes a video processor for performing various processes on a video signal input from the AV switch 4;
The processed video signal is supplied to the RGB drive 8 as an RGB signal and then displayed on the CRT 11. The video processor ₅ is connected to a video output terminal t5 for outputting a video to an external device.

Further, the video processor 5 inserts, for example, a reference signal for measuring white balance into a vertical blanking period of a video signal, and outputs the RGB signal to the RGB drive 8 as an RGB signal. And RGB
The drive 8 outputs an RGB signal at a level at which a stable white balance is to be obtained based on the information on the cathode current Ik corresponding to the output of the reference signal, and thus the white balance is constantly adjusted. When the white balance is determined to be appropriate, that is, when the level of the cathode current Ik exceeds a certain value, the video processor
Output to U14.

Reference numeral 6 denotes an audio processor for performing various processes on the audio signal input from the AV switch 4, and the processed audio signal is supplied to an audio drive 9.
After being fed amplified and outputted from the speaker 12 and the external audio output terminal t _4. A scan processor 7 generates horizontal / vertical deflection currents based on the horizontal / vertical synchronization signals input from the AV switch 4 and supplies these to the deflection yoke 10. The scan processor 7 outputs a horizontal synchronization signal to the CPU 14, which will be described later.

A CPU 14 controls each of the above-described functional circuits via a control bus CB in accordance with an operation or control command output from the remote commander RC and input via the infrared receiving unit 13. Reference numeral 15 denotes a RAM in which various control data, functions and status of each functional circuit, and the like are stored.

The control bus CB comprises an address bus for designating an address which is data for designating an input / output location of transmission data, and a data bus for exchanging data for actual control and the like, as shown in the figure. In some cases, the signal paths are shared, or the signal paths are individually provided.

Each of the functional circuits such as the U / V tuner 1 and the BS / CS tuner 2 is assigned a dedicated address code (hexadecimal), for example. When the CPU 14 switches, for example, the selected channel of the U / V tuner 1, the U / V tuner 1 transmits an address code of the U / V tuner 1 through the address bus to access the U / V tuner 1, thereby obtaining the U / V tuner 1. The tuner 1 enters a standby state for inputting control data. Then, control data is transmitted via the data bus, and channel switching of the U / V tuner 1 is executed.

When each functional circuit such as the U / V tuner 1 receives control data, a bidirectional communication system for returning an acknowledgment signal indicating the input to the CPU 14 is used, so that a large number of functional circuits can be implemented. The connection is made by a control bus CB composed of two types of bus lines, an address bus and a data bus, so that control can be efficiently performed by serial data.

As described above, in the television receiver as shown in FIG. 4, since each functional circuit is controlled via the control bus CB, for example, the CPU 14
Controls the video processor 5 and the audio drive 9 based on data input from a predetermined circuit unit,
Mute image displayed on RT 11 and speaker 12
(In this case, includes an external audio output terminal t ₄₎ is known which is configured to mute the sound output from the is carried out.

For example, from when the power is turned on until the beam current level becomes constant and a stable image is obtained, that is, during the period from the start of the beam current to when the white balance is stabilized, the white balance becomes poor due to some trouble. In such a case, the image is muted. That is, the CPU 14 sends data indicating whether or not the level of the cathode current Ik is equal to or higher than the predetermined value from the video processor 5 to the control bus CB as described above.
When the cathode current Ik has not reached the predetermined level, a control signal for stopping the output of the RGB signal to the video processor 5 is output via the control bus CB. Then, the output of the RGB signal from the video processor 5 to the RGB drive 8 is stopped. As a result, no image is displayed on the CRT 11, and the image is muted. When the cathode current Ik reaches a predetermined level, the output of the control signal for stopping the output of the RGB signal to the video processor 5 is stopped. Thereby, the mute operation of the image is released.

When an image is switched by channel switching, the image immediately after the switching may be unstable. Therefore, the CPU 14 outputs a control signal for stopping the output of the RGB signal at the time of channel switching for a predetermined time to the video processor. 5 to mute the image for a certain period of time. In this case so that the output is also muted for external video output terminal t _5.

As described above, when an inappropriate video is displayed, the CPU 14 controls the video processor 5 to stop the RGB output so that the image is muted.

When the power is turned on or the channel is switched, for example, noise such as a sound may be generated when the power is turned on. Therefore, the CPU 14 sets the audio drive 9 for a predetermined time until the sound is output properly. the state by outputting a control signal for stopping the sound output, output to the speaker 12 and the external audio output terminal t ₄ is applied is for muted voice not be made to.

In a case where an appropriate audio output cannot be obtained due to a poor reception state or a failure, the CPU
14 always counts the horizontal synchronization signal input from the scan processor 9 shown in FIG.
If the state in which the number of horizontal synchronization signals in the field is out of the preset range continues for 3 seconds, the CPU
Numeral 14 outputs a control signal for stopping audio output to the audio drive 9 to mute audio.

When the user operates the mute key provided on the remote commander RC to mute the sound, the CPU 14 stops the sound output to the audio drive 9 in accordance with the input command. It operates by outputting a control signal.

As described above, at the time of power input or channel switching, if an appropriate video and audio are not output due to some abnormality, control for automatically muting these outputs is performed. With this configuration, the user does not see an unsightly image or hear unnecessary noise or the like in a normal use state.

Further, in addition to the operations performed by the user during normal times and the control by the CPU 14, various adjustments can be made via the control bus CB even in a service mode particularly used for maintenance or the like.
For example, put the television receiver in standby mode,
After a predetermined key operation of the remote commander RC, the power is turned on. Then, the CPU 14 sets the service mode, and the status (data) of various functional circuits stored in the RAM 15 is displayed on the CRT 11 via the control bus CB, and the operation keys of the remote commander RC are referred to by referring to the status display. Allows various adjustments to be made. And the RAM at the same time as various adjustments
The contents of the status (data) of each functional circuit stored in 15 are also rewritten. The data such as characters to be displayed in the service mode is stored in the video processor 5.
The video processor 5 combines the video signal with the video signal under the control of the CPU 14.

As described above, since adjustment data and the like can be exchanged via the control bus CB, maintenance such as repair and adjustment can be performed using the remote controller RC and the like.

[0022]

In the case where an image failure occurs, for example, a plurality of points such as a signal processing system, a deflection system, and a power supply system can be considered as the cause.
Similarly, a plurality of locations such as a signal processing system, an amplifier (drive) system, and a speaker system can be cited as a cause of a failure related to audio. However, in recent television receivers, as shown in FIG.
Since various circuit units operate under the control of the microcomputer including the M15, it is difficult to identify the cause of the failure.

In addition to such a situation, in a television receiver in which the above-described video and audio mute control is performed, the video and audio are not output when the power is turned on or when the channel is switched. The state during that period cannot be grasped. In addition, even in the event of an abnormality due to a failure or the like, the video and audio are automatically muted, and the symptoms of the video and audio cannot be confirmed, and much time is spent identifying the cause of the failure. I had to.

[0024]

To solve the problems mentioned above SUMMARY OF THE INVENTION The present invention includes a storage unit that pre-set conditions to run the mute mute or audio output of the display image, the input video signal and audio By outputting a control signal in accordance with an operation to each circuit unit that performs various processes on the signal, the control unit performs various processes including a process of muting the display image or a process of muting the audio output, and stores the data. mute reads the condition from means
And configured and control means for determining whether to perform.

This control means operates in the service mode.
Is by the determination, it is determined to execute the mute
Even when the, was be configured not to perform 該Mi chute process.

[0026]

In the service mode, the microcomputer and its related functions are provided so that the setting and cancellation of the control for inhibiting the muting of the display image and the muting of the sound output, which are performed as a normal process, can be performed. By configuring the circuit, the display image and the audio output are output without being muted even when the power is turned on, when the channel is switched, or when a failure occurs. This facilitates confirmation of the symptoms at the time of failure and identification of the cause of the failure.

[0027]

An embodiment of the present invention will be described below. Note that the television receiver as the present embodiment is the same as that shown in FIG. 4, and the description is omitted here. In the present embodiment, as shown in the flowchart of FIG. 1, the setting and cancellation of the mute inhibition control are simultaneously performed for the display image and the audio output. In the routine for setting / releasing the mute prohibition control, the CPU 14 first determines whether or not the mode is the service mode (F101). When the mode is not the service mode, the CPU 14 performs other processing other than the setting / release of the mute prohibition. (F106). If it is determined in step F101 that the current mode is the service mode, it is determined whether a key operation corresponding to the setting / cancellation of the mute inhibition mode of the remote commander RC has been performed (F10).
2). If no key operation has been performed, step F106
The process proceeds to step F103. If it is determined that the key operation has been performed, the process proceeds to step F103 to determine from the RAM 15 whether the current mode is the mute prohibition mode. The determination is made by reading the data. If it is determined in step F103 that the current mode is the mute inhibition mode, data for turning off the mute inhibition mode is transferred to the RAM 15 to release the mute inhibition mode (F104), and it is determined that the current mode is not the mute inhibition mode. In this case, the data for turning on the mute inhibition mode is transferred to the RAM 15 to set the mute inhibition mode (F105), and the process returns to the main routine.

Steps F101 → F102 → F103 → shown in FIG.
If the mode is set to F105 and the mute prohibition mode is set, the mute prohibition operation of video and audio is performed according to the processing shown in the flowchart of FIG. Although the actual processing is performed independently for video and audio, the same processing operation is performed. Therefore, both processings will be described with reference to FIG. 2 only. First, the CPU 14 determines whether or not data indicating a condition for muting a display image (audio output) has been input (F201). The conditions for muting are, as described above, a state where power is turned on in the case of a display image, a time of channel switching, and a time of white balance failure due to some abnormality. For example, when the power is turned on, when the channel is switched, or when a silent or noise state due to some abnormality continues, these are set in advance as conditions for muting the display image and stored in the RAM 15. These data are inputted to the CPU 14 from the predetermined circuit section via the control bus CB as described above.

If it is determined in step F201 that data indicating a condition for muting the display image (audio output) has not been input, the process proceeds to step F205, where other processing is performed. If it is determined that the input has been made, the process proceeds to step F202 to determine whether the current mode is the service mode. If it is determined in step F202 that the current mode is the service mode, the CPU 14 does not output a control signal for muting the display image (audio output), and thereby outputs the display image (audio output). The mute process is prohibited (F203). On the other hand, if it is determined that the current mode is not the service mode, it is determined that the display mode is the normal use state, and the CPU 14 outputs a control signal for muting the display image (audio output). ) Is performed (F204).

By performing the processing described with reference to FIGS. 1 and 2 above, if the operation of setting / releasing the mute prohibition is performed once, this can be performed simultaneously for both the display image and the audio output. In the case of the present embodiment, this setting /
Since the canceling operation and the mute prohibition processing operation are limited to the service mode, there is no possibility that a general user carelessly sets the mute prohibition mode to cause confusion.

Next, another embodiment of the present invention will be described with reference to the flowchart of FIG. In the present embodiment, the operation of setting / releasing the mute inhibition mode of the display image and the sound output can be performed individually. In addition,
The television receiver according to the present embodiment is also the same as that shown in FIG.

In the routine for setting / releasing the mute prohibition control in this embodiment, the CPU 14 first determines whether or not the mode is the service mode (F301). Other processing other than the above is performed (F310). On the other hand, if it is determined in step F301 that the current mode is the service mode, it is determined whether a key operation corresponding to setting / cancelling the image mute inhibition mode of the remote commander RC has been performed (F302). If it is determined in step F302 that a key operation in the image mute prohibition mode has been performed, the process proceeds to step F303 to determine whether the image mute prohibition mode is currently set.

If it is determined that the current mode is not the image mute prohibition mode, data for turning on the image mute prohibition mode is transferred to the RAM 15 to set the image mute prohibition mode (F304). If it is determined that the image mute prohibition mode is turned off, the data for turning off the image mute prohibition mode is transferred to the RAM 15 to release the image mute prohibition mode (F305). In this embodiment, R
In the AM 15, addresses corresponding to data for turning on / off the mute inhibition mode are set individually for the image and the sound.

If it is determined in step F302 that the operation of the key in the image mute inhibition mode is not performed, the process proceeds to step F306 to determine whether the operation of the key in the audio mute inhibition mode is performed. This step F3
If it is determined that the operation of the key in the audio mute prohibition mode is not performed in 06, other processing other than the setting / cancellation of the mute prohibition is performed (F310). If it is determined that the operation has been performed, the process proceeds to step F307 to determine whether or not the audio mute inhibition mode is currently set. If it is determined in step F307 that the current mode is the audio mute prohibition mode, data for turning off the image mute prohibition mode is transferred to the RAM 15 to release the image mute prohibition mode (F308). When it is determined that the image mute prohibition mode is turned on, data for turning on the image mute prohibition mode is transferred to the RAM 15 to set the image mute prohibition mode (F309). The mute prohibition operation of the display image or the audio output after the mute prohibition mode is set is the same processing as in FIG.

By performing the processing as described above, the operation of setting / releasing the mute prohibition mode of the display image and the sound output can be performed individually, and for example, it is possible to cope with a fine maintenance work. Also in this case, since the setting / cancellation operation and the mute prohibition processing operation are limited to the service mode, the general user does not carelessly set the mute prohibition mode.

It is needless to say that the configuration of the television receiver as an embodiment is not limited to the block diagram shown in FIG. 4, and the control of various processing circuits is controlled by a microcomputer or the like via a control bus CB. Various modifications may be considered, for example, providing a circuit section related to the small-screen display function, and the present invention can be applied to a monitor device and the like.

[0037]

As described above, according to the present invention, for a television receiver having a function of mute processing of a display image and a sound output, a processing for inhibiting a mute operation of a display image and a sound output is performed. The video and audio are output without the mute operation even when the power is turned on, when the channel is switched, or in the event of any abnormality. The state can be grasped, and the cause of the failure can be easily specified. Further, since such processing is set and canceled only in the service mode, there is no inconvenience that the user mistakenly enters the mute inhibition mode.

Further, the setting and cancellation of the control for inhibiting the mute operation may be configured to be performed simultaneously for the display image and the audio, or may be configured to be performed separately for the display image and the audio output. Either of these methods can further facilitate maintenance. Thus, the television receiver of the present invention has the effect of improving the maintenance work efficiency.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an operation of setting / releasing a mute inhibition mode in an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of prohibiting mute of image and sound output in the embodiment.

FIG. 3 is a flowchart illustrating an operation of setting / releasing a mute prohibition mode of an image and a sound output in another embodiment.

FIG. 4 is a block circuit diagram showing an embodiment of the television receiver of the present invention.

[Explanation of symbols]

 Reference Signs List 5 Video processor 7 Scan processor 8 RGB drive 9 Audio drive 10 Deflection yoke 11 CRT 12 Speaker 13 Infrared light receiving unit 14 CPU 15 RAM RC Remote controller CB Control bus

Claims (1)

(57) [Claims] And 1. A storage means preset the conditions for executing the muting mutes or audio output of the display image, to each circuit unit for performing various processes on the input video signal and audio signal, according to the operation By outputting a control signal to control various processes including a process of muting the display image or muting the audio output, the condition is read out from the storage means and muted.
The and control means for determining whether to execute, wherein, in the service mode, the determination
Accordingly, even when it is determined to perform the mute,
Television receiver is characterized in that so as not to perform 該Mi chute process.