JPS6196882A - Television receiver - Google Patents

Abstract

PURPOSE:To sweep away of a poor picture at the time of selecting a channel even when a television channel is selected with the aid of a remote control signal during displaying a picture of other channel by muting a video at the time of switching a channel during displaying a television picture and inhibiting the video muting during displaying other pictures. CONSTITUTION:A switch SW is installed on a transmission line of a blanking signal PB1 transmitted from a channel selection circuit 14, and controlled by a blanking control signal CTL transmitted from a control circuit 20. The blanking signal with respect to a sound is supplied to a sound amplifier 7 at the previous stage of the switch SW in order to ensure said signal against muting. Under the state where a character picture or external one is projected, the switch SW through which the blanking control signal CTL is transmitted is turned off. Thus other pictures displayed on a CRT surface 5 are not blanked even if a television channel is selected by the remote control signal in the state where other pictures except the television picture are displayed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention enables other image displays such as reservation display images and calendar display images to be displayed instead of television images by using the tube surface of a cathode ray tube. The present invention relates to a television receiver, and particularly to a television receiver that can prohibit video muting while displaying other images.

[Conventional technology]

For television receivers that have a timer function, it is better to use part or all of the TV screen to display the time and calendar, as well as display channel content reservations while watching the TV screen. This is extremely convenient for the user because the receiver can be used for multiple purposes and the displayed content can be checked while viewing the television screen.

The present applicant had previously proposed a television receiver capable of realizing such a purpose (for example, in Japanese Patent Application No. 100181/1983).
No. etc.).

Since the present invention is suitable for application to such a television receiver, the prior art disclosed in Japanese Patent Application No. 100181/1983 will be explained first.

FIG. 2 is a system diagram showing an example of the above-mentioned television receiver, in which (11 is a chainer, (2) is a video intermediate frequency amplification circuit, (3) is a video detection circuit, and (4) is a video output circuit. , (5) is a picture tube (CRT), (6) is an audio intermediate frequency amplification circuit, (7) is an output amplifier, (8) is a speaker, (9) is a horizontal and vertical deflection circuit, ( 11)
is a deflection system. (12) is an electronic circuit, and (13)
1 is a decoder that receives a remote control signal and a channel selection signal inside the receiver, and 14 is a channel selection voltage forming circuit (channel selection circuit). Further, the output of the decoder (13) is supplied to an AC power supply control circuit (17). (18) is a light receiving element for remote control signals.

Further, (20) is a control circuit having a program timer function for image display, and its main body is a microcomputer. A CRT control circuit (25) with a built-in character generator operates in response to a command from the control circuit (20). Red to blue character signals (numbers, letters, symbols, etc.) sR, SG+sB are generated from the CRT control circuit (25). In addition, the control circuit (20) sends a blanking signal BLK for erasing the television image to the video output circuit (4), and, if necessary, sends an audio control signal so that a buzzer sound will sound at the end of the key operation. S^ is sent to the audio control circuit (27).

A mixer (21) is provided downstream of the video detection circuit (4), and switches between the television signal output from the video detection circuit (4) and other image signals. In this example, other image signals include character signals sent from the CRT control circuit (25) and image signals (R, G,
B primary color signal) (hereinafter referred to as external signal). Terminal (
22) is a supply terminal for this external signal.

Further, in this example, a video blanking circuit (23) is provided at a stage subsequent to this mixer (21).

The blanking circuit (23) was provided immediately before the cathode ray tube (5) so that when switching between character images or external images and television images, the image can be blanked when switching. It is.

Blanking signal PB work is channel selection circuit (14)
Sent from

The AND circuit (19) is for inhibiting input of a remote control signal by means of a pulse P when a control signal is being sent from the control circuit (20) to the electronic tuning circuit (12).

(28) is inside the receiver body, in this example P P CQ'rogrammable
(29)
is a timer key that can turn on and off the reservation timer, and the command data of these keys is taken into the CPU via the I10 port provided in the control circuit (20).

FIG. 3 shows an example of the control circuit (20), which is well-known and includes CPU (21^), ROM (228), and RAM.
(23A) and an I10 port (24), and a remote control signal from a commander (described later) is input from the input port side of the I10 port (24), and a key (
2B) and (29) are connected. And the CPU
To provide synchronization pulses for the clock timer in (21), a commercial AC signal from a commercial AC source (50/60 Hz) (37) is fed to a pulsing circuit (38) to form a power synchronization pulse.

FIG. 4 shows an example of the key layout provided on the commander (30). The commander (30) is used for channel selection, power on/off, etc., as well as for presetting the above-mentioned current time. Among the multiple keys, (31) is a channel direct selection key, the PPC key is a mode switching key with the same function as the one provided on the main unit, (32)
, (33) is "+".

"-" key, (34) and (35) are shift keys to shift the data setting mark "↓" left and right, (3
6) is a pencil-shaped clock start key.

Time display, calendar display, etc. are executed based on instructions from the microcomputer.

FIG. 5 is a display flowchart that explains the image display in relation to key operations during the various types of data storage and notation mentioned above. Using this, the outline of the operation procedure will be explained as follows.
First, when you turn on the main power, a normal TV image (step a) is displayed, and if you press the PPC key, if the current time is in front of you, the TV image will be displayed, regardless of the actual date, etc. A predetermined date and time are superimposed on (step b). An example of the date and time display is shown in FIG. 6A. The predetermined date is just one example.

When the current time is set and the clock is already running, the actual date and time are superimposed and displayed (step C). If the current time is not yet set, please set the current time in step d).Clock start key (36)
When turned on (step e), the timer program operates from that point on and starts counting, and the process moves to step C.

Instead of operating the clock start key (36),
When you press the C key, if the cursor "↓", which is the data setting mark displayed at the "year" position, is not in the r100J era, the watch enters the clock start mode in the same way as operating the clock start key (36). At the same time, the current month's calendar is displayed instead of the television image (step f). Step C
If you press the PPC key from this state, the current month's calendar will be displayed in the same way.

When the PPC key is pressed after step f, the channel reservation mode is entered (step g'), and a channel reservation image is displayed on the CRT screen in place of the television image. An example of a reservation image is shown in FIG. 6B.

If you press the PPC key while reserving a channel or after reserving a channel, a normal TV image will be displayed.

Also, if you press the PPC key in the state of step b, or with the cursor at the r100J position in the state of step d (without operating the clock start key), the demonstration calendar is displayed (step h). An example of a demonstration calendar is shown in FIG. 6C.

In this way, the year and month displayed on the demonstration calendar bar and steering knob b are displayed. This demonstration calendar is incremented at intervals of several seconds (2 to 3 seconds), and the calendar for the next month is displayed in sequence. In this case, all dates on the calendar disappear once, and the next moment a scroll-down display is performed in which the days are displayed sequentially from the 1st. The calendar follows the Gregory calendar, starting from January 0000 to 999.
It will be displayed until December 2009.

In this way, when the year, month, day, and time are not set, the monthly calendar is automatically turned over, so that it is possible to visually confirm that the current time has not been set. If the PPC key is pressed in this state, the display will be switched to the channel reservation display.

In the case of the channel reservation display described above, the background is blue and the characters and symbols are green.

In addition, in the channel reservation mode, as shown in Figure 6B, the title rTIMERJ is displayed on the CRT screen, and next to it is the current day of the week (Monday (MAN) ~
day (SUN)) and current time (hour.

minutes (1 second) are displayed. When the current time is not set, the day of the week and the current time are displayed with blinking.

The center of the CRT screen is reserved for channels (event reservations)
In this example, three events can be reserved. The reservation details are ``what day of the week, from what time to what time, what channel''. The “ON” display is the timer on time, r OF F
J is the timer off time, rcHj is the channel, and r MODEJ is the input selection mode. Although the figure shows the TV input mode, you can also select a VTR input mode or a computer input mode. Therefore, the commander (30) has a mode selection key (
388) to (38G) are provided.

The day of the week is selected from a plurality of preset day of the week setting columns.

[Problem that the invention seeks to solve]

The above-mentioned television receiver has a control circuit (
20) and a CRT control circuit (25), it is extremely convenient because the current time, calendar, and channel reservations can be displayed using the television screen.

By the way, as mentioned above, the pulse P prohibits the manual input of the remote control signal only while the control signal is being sent to the electronic tuning circuit (12). Therefore, when a remote control signal is input manually when an image other than a television image is displayed, the user can freely select a television channel. The reason for doing this is that when you want to watch a TV image after the currently displayed image, it is extremely convenient to select that channel at the front.

However, if an attempt is made to select a channel in advance by such a remote control operation, a blanking signal PB□ is sent out from the channel selection circuit (14) when the channel is changed.

Since the blanking circuit (23) is provided after the mixer (21), each time the remote control is used to change channels, video blanking is applied to the currently displayed image, causing the screen to become very shaky. It becomes easy.

Therefore, this invention solves these problems, and makes it possible to display other images such as reservation display images and calendar display images instead of television images by using the tube surface of the cathode ray tube. In the television receiver,
Other i! mentioned above ! ! During the I@ display, the image display is prohibited from being displayed, thereby preventing the image from becoming tilted.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, as shown in FIG. 1, a switch SW is provided on the transmission path of the blanking signal pB sent out from the channel selection circuit (14). This switch SW is controlled by a blanking control signal CTL sent from a control circuit (20).

The blanking signal for the audio is connected to the audio amplifier (7) from the front stage of the switch SW so that it is not muted.
supplied to

[Effect]

While the television image is being displayed, the blanking control signal CTL is not sent out, the switch SW remains on, and a normal blanking operation is performed. Further, the normal blanking operation is also performed when switching and displaying a television image and a character image, a character image and an external image, or a television image and an external image.

On the other hand, when a character image or an external image is displayed, the blanking control signal CTL is sent out and the switch SW is turned off. As a result, even if a television channel is selected by a remote control signal in an image display state other than a television image, other images displayed on the CRT screen are not blanked.

This ensures that other unsightly image displays are avoided.

〔Example〕

FIG. 1 shows an example of a television receiver αω having a timer reservation function according to the present invention.

In the figure, a first switch SW is provided on the transmission path of the blanking signal PB1 obtained from the channel selection circuit (14), and this is controlled by the blanking control signal CTL sent from the control circuit (20). Ru.

A second switch (51) is provided at the front stage of the deflection circuit (9), and it outputs the horizontal and vertical synchronization signals separated from the video signal detected by the image detection and the internal horizontal and vertical synchronization signals obtained from the internal synchronization circuit (50). The vertical synchronization signal is connected to this second switch (
51) to the deflection circuit (9).

The external and internal horizontal and vertical synchronization signals fed into the deflection circuit (9) are further fed into the CRT control circuit (25).

The blanking signal PR1 for audio muting is the first
The signal is directly supplied to the amplifier (7) without going through the switch SW.

Since the blanking control signal CTL is not supplied from the control circuit (20) when a television image is displayed, in this state, the video and audio are blanked (muted) each time a channel is selected as usual. At this time, since the second switch (51) is switched to the external synchronization side, the deflection circuit (9) is controlled by the external synchronization signal separated from the video signal.

In a state where another image is being displayed instead of the television image, a blanking control signal CTL is obtained from the control circuit (20) and the first switch SW is turned off. Therefore, if you select a TV channel in advance using a remote control signal while another image is being displayed, video blanking is also prohibited by this channel selection operation, so channel selection is performed and "ζ" is also Images are not blanked.

Note that when the television image and another image are switched in other image display states, this switching state is determined by the control circuit (20), so in this case, the control circuit (20)
20), the blanking control signal CTL is not sent,
As a result, video and audio blanking is performed in the same manner as described above.

In other image display states, the second switch (51) is also controlled and switched to the internal synchronization side, so that in this case horizontal and vertical deflection is performed by internal horizontal and vertical synchronization signals.

The reason why the synchronization signal is changed when displaying other images in this way is because the synchronization relationship between the other image signals and the television signal is asynchronous.

〔Effect of the invention〕

As explained above, according to the present invention, in a television receiver that can display other images such as a reservation display image, a calendar display image, etc. instead of a television image using the tube surface of a cathode ray tube, While displaying a TV M image, video muting is performed when switching channels, and video muting is prohibited while other images are being displayed.

According to this, even if you select a TV channel using a remote control signal while another image is displayed, other images will not be blanked, which will definitely improve the unsightliness of the image when selecting a channel. be able to. Therefore, according to the present invention, it is possible to solve the unsightliness of the currently displayed image while maintaining the usability of being able to select a TV channel on the fly even while another image is being displayed. It is extremely suitable for application to a television receiver having such a timer function.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an example of a television receiver having a timer function according to the present invention, FIG. 2 is a system diagram showing an example of a television receiver used to explain the invention, and FIG. 3 is a control circuit. A system diagram showing an example, FIG. 4 is a plan view showing an example of a commander key arrangement, FIG. 5 is a chart showing an example of display transition used to explain the present invention, and FIG. 6 shows an example of a display image. It is a diagram. (20) is a control circuit, (25) is a CRT control circuit, SW
, (51) are the first and second switches, (23) is the image blanking circuit, (21) is the mixer, P, and BLK is the blanking signal, and CTL is the blanking control signal. Figure 3 Figure 5

Claims (1)

[Claims] In a television receiver that can display other images such as reservation display images, calendar display images, etc. instead of the TV image using the tube surface of the cathode ray tube, video muting is performed when changing channels while the TV image is being displayed. A television receiver characterized in that the video muting is prohibited while the other images are being displayed.