JPH07107406A - Television receiver - Google Patents

Abstract

PURPOSE:To avoid unnecessary character display by checking whether prescribed character information should be projected or not even in the case of the change of the audio mode and determining whether required character information should be displayed or not in accordance with the check result. CONSTITUTION:A demodulation output Smd of carrier multiplex control signals of U/V tuners 11 and 12 is supplied to an MPU 41 as audio multiplex mode discrimination information, and the change of the signal Smd is detected to judge whether the audio mode is changed or not. If the change is detected, it is judged whether the surface display mode of the TV receiver is set to 'display off' or not. When it is set to 'display on', the channel number of the reception channel and characters of the audio mode like monaural, stereo, or double sounds are displayed in one corner on the surface of a receiver 36 by a video signal processor 31. This display is continued for a prescribed time, and the original state is restored thereafter. When the display mode is set to 'display off', the state of the display mode is kept as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver which is compatible with multiplex audio broadcasting and has a function of displaying channel numbers and audio modes.

[0002]

2. Description of the Related Art As is well known, in current television broadcasting, sound of a considerable amount of programs is transmitted by a multiple modulation system. As shown in FIG. 5, in the audio multiplex modulation method, a subcarrier is added to a baseband monaural audio signal (main channel signal), and this subcarrier is frequency-modulated by a second audio signal to produce a subchannel signal. It is formed. In the case of stereo, the second audio signal is the difference signal. Further, a second subcarrier is added, and the second subcarrier is amplitude-modulated by the multiplex control signal.

The frequency of the multiplex control signal is 982.5 Hz for stereo broadcasting and 92 for double audio broadcasting.
It is defined as 2.5 Hz. Then, by detecting this frequency difference, it is possible to distinguish between stereo broadcasting and dual audio broadcasting. A television receiver compatible with audio multiplex broadcasting can automatically switch and display audio multiplex modes.

[0004]

By the way, in recent television receivers, as shown in FIG. 6, a channel number of a television broadcast program being received and a voice multiplex mode of monaural, stereo, and double audio are provided. In general, a character display function for displaying predetermined character information on the screen Scn of the picture tube is provided.

With respect to the display mode of this character display function, the user selects and sets the character display mode on or off ("display on", "display off") by using a remote controller or the like, and when the normal program is viewed, Generally, a television receiver is arranged so that it can be set whether or not a character display is displayed on the screen.

However, in order to inform the user of the current program status at the time of mode transition such as power-on or channel selection, the character information as described above is maintained for an appropriate time regardless of the character display mode status. Is displayed on the screen. Similarly, even when the audio mode is changed to the multiplex broadcasting, the audio mode after the change is displayed on the screen for a predetermined time regardless of the state of the character display mode. At this time, the channel number is generally displayed.

[0007] By the way, a television program of a private broadcasting station has an advertisement broadcast, so-called commercial message (C
M) is inserted, but the sound of this CM is generally broadcast in stereo, and the broadcast program and the sound mode often differ.

When watching a broadcast program of such a private broadcast station on a television receiver equipped with the character display function as described above, if the broadcast program and the CM have different audio multiplex modes, the broadcast station side Since the voice multiplex mode of the received signal is switched every time the CM is inserted in, the text information such as the voice multiplex mode or the channel number of the broadcast program being viewed is irrespective of the character display mode output from the receiver. There is a problem in that it is displayed on the screen Scn of the picture tube, which is annoying to the viewer.

In view of the above points, an object of the present invention is to provide a television receiver capable of avoiding unnecessary character display due to switching of audio modes in a broadcast program.

[0010]

In order to solve the above-mentioned problems, the television receiver according to the present invention, when the reference symbols of the embodiments described later are made to correspond to each other, the predetermined character information regarding the television broadcast program being received is displayed. In a television receiver capable of selectively setting whether or not to display on the display screen Scn of the image receiving element 36, when the audio signal of the television broadcast program is broadcast by the multiple modulation system, the audio of this multiple modulation system is used. Voice mode discriminating means 11 or 1 for discriminating the mode
2 and based on the discrimination result of the voice mode discrimination means,
Whether or not the predetermined character information is displayed on the display screen according to the selection setting state of whether or not the predetermined character information is displayed on the display screen when it is detected that the voice mode is changed. And a means 41 for determining whether or not it is provided.

[0011]

According to the present invention having the above-described structure, even if the audio mode of the television broadcast program is changed, the selection setting state whether or not the predetermined character information is displayed on the display screen is surely checked. . Then, according to the check result, it is determined whether or not the necessary character information is displayed. Therefore, due to the switching of the audio mode during the broadcast program,
Unnecessary character display is avoided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a so-called horizontal screen television receiver which employs a picture tube having an aspect ratio of 16: 9 will be described below with reference to FIGS.

In FIG. 2, 10 is a tuner system, 20 is an audio signal system, 30 is a video signal system, and 40 is a control system.

The tuner system 10 is a terrestrial broadcasting antenna A.
Two U / V tuners 1 for receiving broadcast signals from g.
1 and 12, a BS / CS tuner 13 for receiving a broadcast signal from a satellite broadcasting antenna As, and this tuner 13
And a converter 14 for converting a MUSE signal of high-definition television broadcast, so-called high-definition broadcast, received into the NTSC system signal.

The selection of the U / V tuners 11 and 12 is performed by the system control circuit (microprocessor) 41 of the control system 40.
Controlled by. Also, the selection of the BS / CS tuner 13 is controlled by a dedicated microprocessor 15.

Further, the demodulation output Smd of the carrier multiplexing control signal of the U / V tuners 11 and 12 is supplied to the microprocessor 41 as the discrimination information of the voice multiplexing mode.

From the U / V tuners 11 and 12 and the BS / CS tuner 13, composite video signals V11, V12,
V13 and left and right audio signals L11, L12, L13; R11, R1
2 and R13 are output, and the signal selector (switch) 16
Is supplied to each. The converter 14 outputs a luminance signal Y14, a carrier color signal C14, and audio signals L14 and R14.
Are output and supplied to the signal selector 16, respectively.

The selector 16 is a microprocessor 41.
The composite video signal Vp and audio signals Lp and Rp for the parent screen and the composite video signal Vs for the child screen are obtained from the above. The audio signal from the selector 16 is supplied to the audio signal system 20, and the video signal is supplied to the video signal system 30.

The audio signal system 20 includes an audio signal processor 2
1 and left and right speakers 22 and 23. Selector 16
In the processor 21, the sound signal for the parent screen is adjusted / adjusted in volume, sound quality, balance, etc. under the control of the microprocessor 41, and is not shown in FIG.
It is supplied to the speakers 22 and 23 via a pair of drive amplifiers.

The video signal system 30 includes a video signal processor 3
1, a Y / C separation circuit 32 for a parent screen, a signal processing circuit (hereinafter referred to as PinP circuit) 33 for a child screen, and a microprocessor 34 for forming an image frame by a three-dimensional comb filter using frame correlation. With.

Each of the video signal processor 31 to the image frame forming microprocessor 34 is controlled by the system microprocessor 41.

The composite video signal Vp for the parent screen is separated into a luminance signal Y32 and a carrier color signal C32 in the Y / C separation circuit 32 and returned to the signal selector 16. And
The luminance signal Y32 and the carrier color signal C32, and the converter 1
The luminance signal Y14 and the carrier color signal C14 from 4 are selectively obtained from the signal selector 16 and supplied to the processor 31.

The composite video signal Vs for the child screen is PinP
In the circuit 33, the luminance signal Y and the color difference signals RY and B-
A blanking signal Y that controls the display position and size of the small screen after being separated and demodulated into Y and subjected to predetermined processing
It is supplied to the video signal processor 31 together with S.

Image frame forming circuit (microprocessor) 3
4 generates a blanking signal S34 for forming an image frame for cutting an unnecessary portion in the normal mode and the zoom mode as described later.

The microprocessor 41 includes a red R for displaying the receiving channel, voice mode, etc. on the screen in characters.
The three primary color signals S41 of green G and blue B are output. The output signal S41 is added to the blanking signal S34 by the adder 35 and supplied to the video signal processor 31.

In the video signal processor 31, under the control of the microprocessor 41, the sharpness and brightness of the image are adjusted, the image distortion is corrected, and the like. The output signal S31 is supplied to the picture tube 36 through a set of drive amplifiers (not shown),
The image is displayed on a wide tube surface in any one of a plurality of image display modes described below.

Under the control of the microprocessor 41, the deflection coil 37 receives the required deflection current from the variable deflection circuit 38 in accordance with a plurality of types of image display modes as shown in FIGS. Is supplied, and an image is displayed on the wide tube surface Scw in one or both of the horizontal and vertical directions. That is, in the case of this example, various display modes are realized by changing the beam scanning speed and the deflection width according to the image display mode. Instead of changing the beam scanning speed or the deflection width, the video signal may be time-axis processed.

In common with the deflection circuit 38 and the image frame forming circuit 34, a horizontal / vertical synchronizing signal H39, V39 is supplied from a synchronizing separation circuit 39.

Further, in this embodiment, the wide tube surface Scw of the picture tube having the aspect ratio of 16: 9 is used as shown in FIG.
A normal image Pn having an aspect ratio of 4: 3 in the NTSC system is displayed as shown in FIG. 3B in the wide mode and as shown in FIG. 3C in the normal mode. Further, in the zoom mode, the normal image Pn as shown in FIG. 4A is displayed as shown in FIG. 4B. In this zoom mode, the deflection width is expanded in the vertical direction.

The control system 40 includes a system control circuit 41 and
It is provided with a memory 42 in which information necessary for various controls is stored, and is connected via a bus 43.

Further, the remote control receiver 44 and the operation key 45
By this, various control information from the user, such as tuning, is input to the microprocessor 41, and the control data from the microprocessor 41 is supplied to each unit through the path shown by the dotted line in FIG. .

Next, the display control operation in the audio multiplex mode according to the embodiment of the present invention will be described with reference to FIG. First, in step S1 in FIG. 1, the mode of the audio multiplex broadcasting currently being received is checked by the presence or absence of the multiplex control signal in the audio multiplex demodulation output and the frequency as described above.
In the next step S2, it is determined whether or not the voice mode is changed by detecting the change of the multiplex control signal.

When a change in the audio mode is detected, the current screen display mode of the television receiver is checked (step S3), and whether the display mode is set to "display off" or not. Is determined (step S4).

When the display mode is set to "display on", when the channel number is not displayed on the screen, as shown in FIG. 6, the receiving channel number, monaural, stereo, Characters in a voice mode such as double voice are displayed in one corner of the screen (step S
5). When a channel number is displayed on the screen, the channel number is displayed in a large size, the display color is changed, and a character indicating the audio mode is displayed.

This display is maintained for a predetermined time of, for example, 3 seconds, and after 3 seconds have elapsed (step S6), the original display state is restored. In other words, when the channel number is not displayed, the channel number and audio mode display is erased, the screen is returned to the original blank state, and when the channel number is displayed, the channel number is displayed. The number display is replaced with the original small characters and the original color, and the character display in the voice mode is erased (step S7).

On the other hand, when the display mode is set to "display off", the state of the display mode is maintained as it is (step S8).

As a result, in the above embodiment, unnecessary character display due to the switching of the audio mode during the program on the broadcast station side can be avoided, and the viewer is not bothered.

Although the embodiment in which the horizontally long picture tube is used as the display element for the video signal has been described above, the picture tube is not limited to the horizontally long picture tube. Also, as the display element,
Other types of display elements, such as LCDs, can also be used.

In the above embodiment, the television receiver in which the image display portion from the picture tube to the deflection circuit, so-called display, is integrated with the remaining video signal system, control system and tuner system has been described. However, the present invention is not limited to the above-described embodiment, and a television receiver (tuner) capable of supplying a required video signal and audio signal to a separate display. Can also be applied.

[0040]

As described above, according to the present invention, in a television receiver which is capable of audio multiplex broadcasting and has a character display function, the audio signal of the television broadcast program being received is of a multiple modulation system. When broadcast, unnecessary character display due to switching of the audio mode during the broadcast program can be avoided.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining the operation of an embodiment of a television receiver according to the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a diagram for explaining another operation of the embodiment of the present invention.

FIG. 4 is a diagram for explaining another operation of the embodiment of the present invention.

FIG. 5 is a frequency spectrum for explaining a voice multiplexed signal.

FIG. 6 is a diagram for explaining the operation of a conventional example.

[Explanation of symbols]

10 Tuner system 20 Audio signal system 21 Audio signal processor 30 Video signal system 31 Video signal processor 40 Control system 41 System control circuit (microprocessor) Smd Audio multiple mode discrimination information (multiple control signal) S41 Pipe surface display signal

Claims (3)

[Claims] 1. A television receiver capable of selectively setting whether or not predetermined character information regarding a television broadcast program being received is displayed on a display screen of an image receiving element. Is broadcast in a multiplex modulation system, when an audio mode discriminating means for discriminating the audio mode of this multiplex modulation system and a change in the audio mode is detected based on the discrimination result of the audio mode discriminating means. A means for determining whether or not the predetermined character information is displayed on the display screen according to a selection setting state of whether or not the predetermined character information is displayed on the display screen. Featured television receiver. 2. The predetermined character information is displayed on the image receiving element when it is detected that the sound mode has changed based on the judgment result of the sound mode judging means. Whether or not the character information of is displayed on the display screen is displayed on the display screen, in addition to the character information displayed on the display screen. The television receiver according to claim 1, wherein the television receiver is adapted to determine whether or not it is determined. 3. The television receiver according to claim 1, wherein the image receiving element is a picture tube.