JPH09186619A - Receiver for fm multiplexing broadcasting signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To visibly recognize the change-over of a display screen by permitting the display screen to be the one with a different state compared with the normal display screen for a short period at the time of changing-over the display screen. SOLUTION: An FM multiplexing broadcasting signal receiver receives an FM multiplexing broadcasting signal adding character information, stores received character information in an internal memory, properly reads out stored character information and displays it in a display part. When the display contents of the display part is changed-over from the present display screen to the new one at this time, a shield screen is overridden in a part of the area of the present display screen at first. After that, the overridden area of the shield screen in the present display screen is successively enlarged and the whole present display screen is overridden by the shield screen. Then, the new display screen is overridden in a part of the area of the shield screen. After that the overridden area of the new display screen in the shield screen is successively enlarged and the whole shield screen is overridden by the new display screen so as to change-over the display screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcast signal receiver, and more particularly, to receiving an FM multiplex broadcast signal including character information and temporarily storing the received character information in an internal memory. The present invention relates to an FM multiplex broadcast signal receiver capable of surely recognizing the switching of the display screen of the display unit when the character information is read and displayed on the display unit.

[0002]

2. Description of the Related Art Generally, an FM multiplex broadcast signal has a normal F
It is composed of an M broadcast signal and character information multiplexed in a high frequency region on the base band of the FM broadcast signal,
This character information includes contents such as traffic information and various general information. The FM multiplex broadcast signal is transmitted from a broadcasting station that provides textual information such as traffic information and various general information, and the FM information of each FM is transmitted.
It is received by the multiple broadcast signal receiver. Upon receiving the FM multiplex broadcast signal, the FM multiplex broadcast signal receiver selectively extracts character information such as traffic information and various general information from the FM multiplex broadcast signal, and temporarily stores the extracted character information in the internal memory. Let On the other hand, the character information is appropriately read from the internal memory and displayed on the display unit.

In this case, the FM multiplex broadcast signal receiver has at least a control section having an FM front end, an intermediate frequency circuit, a demodulation circuit, an L-MSK demodulation circuit, a synchronization / error correction circuit, and an internal memory. And a display unit. Then, the FM front end receives the FM multiplex broadcast signal of the broadcast station that provides the character information broadcast service, and converts the received broadcast signal into an intermediate frequency signal. The intermediate frequency circuit amplifies the intermediate frequency signal output from the FM front end to a predetermined level. The demodulation circuit FM demodulates the intermediate frequency signal amplified by the intermediate frequency circuit.
The L-MSK demodulation circuit extracts character information (digital data) from the FM demodulated signal, and the synchronization / error correction circuit performs processing such as synchronization and error correction on the extracted character information, The processed character information is supplied to the control unit. When the character information is supplied, the control unit classifies the character information according to the contents and stores the character information at a predetermined address in the internal memory. After that, when one of the character information reproduction keys provided for each content is operated by the user, the control unit causes the character information of the content corresponding to the operation key to be selected from the character information of various contents stored in the internal memory. Read the information and transmit the read character information to the display,
The character information of this content is displayed on the display unit.

[0004]

In the known FM multiplex broadcast signal receiver, while the character information is being displayed on the display unit, the display screen of the current character information (hereinafter referred to as "display screen" of the character information by operating the feed key is used. Is switched from the current display screen) to a new character information display screen (hereinafter referred to as a new display screen), the current display screen disappears from the display unit and becomes a non-display screen. Immediately after that, the non-display screen disappears and a new display screen is displayed.

Here, when the display content of the display unit is switched from the current display screen to the new display screen through the non-display screen, the display period of the non-display screen can completely recognize the existence of the non-display screen. If it is long enough, the user can visually confirm that the display screen is switched from the current display screen to the new display screen, but the user has no meaning while the non-display screen is displayed. However, if the non-display screen display period is too short to recognize the existence of the non-display screen, that is, if the non-display screen is displayed for only a moment, Does not notice that the current display screen has been switched to a new display screen, and there is an inconvenience that the feed key is operated again.

The present invention solves such inconvenience, and an object thereof is to switch a display screen for a short period of time.
An object of the present invention is to provide an FM multiplex broadcast signal receiver that presents a display screen of a mode different from a normal display screen to visually recognize switching of the display screen.

[0007]

In order to achieve the above object, the present invention receives an FM multiplex broadcast signal containing character information, stores the received character information in an internal memory, and stores the stored character information. FM that is appropriately read and displayed on the display unit
In the multiplex broadcast signal receiver, when switching the display content of the display unit from the current display screen to a new display screen,
First, the shielding screen is overwritten on a part of the current display screen, then the overwrite area of the shielding screen on the current display screen is sequentially expanded, and the shielding screen is overwritten on the entire current display screen. Then, the new display screen is overwritten on a part of the shielding screen, and then the overwrite area of the new display screen in the shielding screen is sequentially expanded, and the new display is displayed on all of the shielding screen. A means for switching the display screen by overwriting the screen is provided.

In this case, the overwriting of the shielding screen on the current display screen and the overwriting of the new display screen on the shielding screen are respectively performed so as to shift the display screen in the horizontal direction (the former). It is preferable that the display screen is moved in the horizontal direction and the vertical direction at the same time (the latter). In the former case, the overwriting of the shielding screen starts from both sides of the display screen and the center of the display screen. The new display screen is overwritten starting from the central portion of the display screen and reaching both sides of the display screen, while the latter overwrites when the latter is reached. The overwriting of the shielding screen starts simultaneously from both sides and the upper and lower sides of the display screen and ends when the central portion of the display screen is reached, and the overwriting of the new display screen is performed from the central portion of the display screen. the start It is preferred to terminate upon reaching a both-side and the upper and lower side of the 示画 surface.

If the above means is adopted, first,
A part of the current display screen is overwritten by a part of the occlusion screen,
After that, the overwriting area of the occlusion screen in the current display screen is sequentially expanded, the entire current display screen is overwritten by the entire occlusion screen, and then a part of the occlusion screen is overwritten by the new display screen. After that, the overwriting area of the new display screen in the occlusion screen is sequentially expanded, and the entire occlusion screen is overwritten with the entire new display screen to be rewritten, and the new display screen is changed from the current display screen. The transitional display screen at the time of switching to is not the display of a non-display screen with no movement as when switching the display section of the known FM multiplex broadcast signal receiver, but the display of a screen accompanied by movement. Moreover, the display of the screen accompanied by such movement is usually quite different from the display content of the screen displayed on the display unit, that is, it is visually appealing that the display screen has been switched. Since those Kill display contents, as a display period of the screen accompanied by the movement was relatively short, the user can recognize visually immediately that switched the display screen.

Here, in the case of overwriting the shield screen on the current display screen (first overwrite) and overwriting a new display screen on the shield screen (second overwrite), the display screen is shifted in the horizontal direction. In the case of the operation to be performed, the first overwrite starts from both sides of the display screen and ends when the central portion of the display screen is reached, and the second overwrite starts from the central portion of the display screen to both sides of the display screen. If it is ended when it reaches, rewriting from the current display screen to a new display screen will be a change of the display screen with movement such that the curtain composed of the shielding screen closes and then opens. . Further, in the case of the operation of simultaneously shifting the display screen in the horizontal direction and the vertical direction, the first overwrite is started from both sides and the upper and lower sides of the display screen and terminated when the central portion of the display screen is reached,
If you start overwriting from the center of the display screen and end it when it reaches both sides and top and bottom sides of the display screen, rewriting the current display screen to a new display screen Since the display screen changes with the movement that the shutter closes and then opens, the transitional display screen change state can be expressed naturally, and the user can display the display without feeling any unnaturalness. The execution of screen switching can be visually recognized.

[0011]

According to an embodiment of an FM multiplex broadcast signal receiver according to the present invention, when the FM multiplex broadcast signal receiver receives an FM multiplex broadcast signal including character information,
The received character information is temporarily stored in the internal memory, and the stored character information is appropriately read and displayed on the display unit. The display content of the character information displayed on the display unit is sent. When switching from the current display screen to a new display screen by operating the keys, first overwrite a part of the current display screen with the masking screen, and then sequentially overwrite the masking screen overwrite area on the current display screen. Expand,
Overwrite all of the current display screen with the entire screen, then overwrite a part of the screen with the new display screen, and then sequentially enlarge the new display screen overwrite area in the screen with the screen The switching of the display screen of the character information is completed by overwriting the entire new display screen on the entire screen.

In the embodiment of the present invention, one of the preferable modes at the time of changing from the current display screen to the occlusion screen and changing from the occlusion screen to a new display screen is When overwriting a hidden screen and overwriting a new display screen on the hidden screen, the overwriting is performed by shifting the display screen in the horizontal direction. Specifically, the current display screen is hidden. The first overwrite that overwrites the screen starts from both sides of the display screen and ends when the center of the display screen is reached, and the second overwrite that overwrites a new display screen on the shield screen is , Start from the center of the display screen and end when it reaches both sides of the display screen.

Further, in the embodiment of the present invention, other preferable modes when changing from the current display screen to the shielded screen and from the shielded screen to the new display screen are as described above. Similar to the aspect, when overwriting the shielded screen on the current display screen and when overwriting a new display screen on the shielded screen, the overwriting shifts the display screen simultaneously in the horizontal and vertical directions, respectively. The first overwrite, which overwrites the current screen with the screen, is
Start simultaneously from both sides and the top and bottom sides of the display screen and end when it reaches the center of the display screen, and overwrite the new display screen on the shielding screen. The second overwrite is from the center of the display screen. It should be ended when it reaches the both sides and the upper and lower sides of the display screen for the first time.

According to the embodiment of the present invention, a non-display screen that does not move at all, unlike when a display screen of a known FM multiplex broadcast signal receiver is switched, is displayed. It is intended to display a occluding screen with a moving screen.
Usually, the contents are largely different from the contents of the display screen displayed on the display unit, so that the contents have a sufficient visual appeal to the user that the display screen has been switched. Then, even if the display period of the moving screen is relatively short, the user can immediately visually recognize that the display screen has been switched.

According to the embodiment of the present invention, the current display screen is overwritten with the shield screen (first overwrite), or the shield screen is overwritten with the new display screen (second overwrite). In doing so, each overwrite is moved in the horizontal direction of the display screen, the first overwrite starts from both sides of the display screen and ends when the center part is reached, and the second overwrite starts from the center part. Either end it when it reaches both sides of the display screen for the first time, or move each overwrite in the horizontal and vertical directions of the display screen at the same time, and change the first overwrite to both sides of the display screen. Start from the upper and lower sides and end when the center is reached.
If you start overwriting from the center and end it on both sides and top and bottom of the display screen, you can rewrite the current display screen to a new display screen and open and close the curtain. There is a change in the display screen with a lot of movement, or even a change in the display screen with a movement that opens and closes the shutter of the camera, so it is possible to naturally represent a transitional change in the display screen. It is possible to visually visually recognize that the display screens are switched without feeling unnaturalness.

[0016]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an FM multiplex broadcast signal receiver according to the present invention, showing an example in which the FM multiplex broadcast signal receiver is an on-vehicle FM multiplex broadcast signal receiver. Is.

In FIG. 1, 1 is an FM front end {FM (F / E)}, 2 is an intermediate frequency amplifier circuit (IFAM).
P), 3 is an FM demodulation circuit (FMDET), 4 is a multiplexer with a noise canceller (NCMPX), 5 is an audio signal amplification circuit (AFAMP), 6 is a speaker (SP),
7 is an L-MSK demodulation circuit, 8 is a synchronization / error correction circuit, 9
Is a control unit (CPU), 9a is an internal memory of the control unit 9, 1
Reference numeral 0 is a display unit, and 11 is an operation key (forward key).

The FM front end 1 comprises a high frequency circuit section, a frequency conversion circuit section, and a tuning circuit section (none of which is shown). The input terminal is connected to the antenna and the output terminal is input to the intermediate frequency amplifier circuit 2. The controller 9 is connected to the end, and the control end is connected to the control unit 9. The intermediate frequency amplification circuit 2 is composed of an intermediate frequency circuit section and an amplitude limiting section (neither of which is shown). One output terminal is connected to the input terminal of the FM demodulation circuit 3 and the other output terminal is connected to the control section 9. To be done. The FM demodulation circuit 3
One output end is multiplexer 4 with noise canceller
Of the L-MSK demodulation circuit 7, and the other output terminal is connected to the input terminal of the L-MSK demodulation circuit 7. The multiplexer 4 with a noise canceller comprises a noise canceller circuit section and a stereo signal demodulation section (neither is shown), and the output end is connected to the input end of the audio signal amplification circuit 5. The audio signal amplifier circuit 5 has two or more channels, and their output ends are separately connected to the speaker 6. The L-MSK demodulation circuit 7 demodulates FM-multiplexed character information (digital data), and its output end is connected to the input end of the synchronization / error correction circuit 8. The synchronization / error correction circuit 8 performs synchronization and error correction of character information (digital data), and its output end is connected to one input end of the control unit 9.
The control unit 9 controls the entire operation of the FM multiplex broadcast signal receiver, has an internal memory 9 a built-in, and the output end is connected to the display unit 10. The display unit 10 has a small display surface made of liquid crystal or the like, and displays character information and the like as appropriate. The operation key storage unit 11 has at least a preset key for channel selection, a manual and automatic follow-up operation key, a feed key, etc., and is appropriately operated according to a user's request or the like, and is connected to the control unit 9. .

The FM multiplex broadcast signal receiver having the above structure operates as follows.

Now, the user can operate the operation key storage unit 1
When one preset key (not shown) in 1 is operated, the FM multiplex broadcast signal preset by the preset key operated in the FM front end 1 is F
It is selectively received by the tuning circuit unit of the M front end 1. The received broadcast signal is amplified by the high frequency circuit section of the FM front end 1 and converted into an intermediate frequency signal by the frequency conversion circuit section. Next, the intermediate frequency signal is amplified by the intermediate frequency circuit section of the intermediate frequency amplification circuit 2, and the noise component and the like are removed by the amplitude limiting section. Subsequently, the intermediate frequency signal is FM demodulated by the FM demodulation circuit 3 and converted into a demodulated signal. Then
The demodulated signal has its noise removed by the noise canceller circuit section of the multiplexer 4 with noise canceller, and is demodulated into left channel and right channel audio signals by the stereo signal demodulation section. Next, the audio signals of the left channel and the right channel are amplified to a predetermined signal level by the audio signal amplifier circuit 5, and reproduced as stereo signals from the right speaker and the left speaker 6, respectively. On the other hand, the demodulated signal obtained by the FM demodulation circuit 3 is also supplied to the L-MSK demodulation circuit 7, where character information (digital data) is reproduced and demodulated from the demodulated signal. Next, this character information is subjected to synchronization and error correction in the synchronization / error correction circuit 8 and supplied to the control unit 9. At this time, the control unit 9 transfers the supplied character information to the internal memory 9a and temporarily stores it in the internal memory 9a according to the content of the character information. In addition to the character information, the display unit 1 is stored in the internal memory 9a.
The additional information for displaying the shielding screen on the 0 display surface is stored.

In this state, when the user wants to see desired information (hereinafter referred to as first information) in the character information such as traffic information, one information display key in the operation key storage section 11 When (not shown) is operated, the control unit 9 responds to the operated information display key, and the internal memory 9
The first information stored in a is read out, and the read-out first information is subjected to processing as described later
Then, the first information is sequentially displayed on the display surface of the display unit 10.

When the first information is sequentially displayed on the display unit 10, the user replaces the first information with other desired information (hereinafter referred to as the second information).
When it is desired to display, the feed key (not shown) in the operation key storage 11 is operated. The control unit 9 reads the second information stored in the internal memory 9a in response to the operated feed key, and after the read second information is also subjected to the processing described below, the display unit 10 The second information is sequentially displayed instead of the first information displayed on the display surface of the display unit 10.

By the way, the control unit 9 sequentially analyzes the read information when reading the information to be displayed from the internal memory 9a in order to display the information on the display unit 10, and then the display unit 1
The information that has already been read is stored in the internal memory 9a again until the information for one screen on the display surface of 0 is read. Then, when the control unit 9 confirms that all the information for one screen on the display surface has been read out and stored in the internal memory 9a,
A process of re-reading the information for one screen in a predetermined order is added. Then, the read-out information for one screen is transferred and supplied to the display unit 10 at a predetermined timing, and is displayed on the display surface of the display unit 10 as described above.

Incidentally, the same kind of processing in a known FM multiplex broadcast signal receiver is carried out by simply reading the information to be displayed from the internal memory and supplying the read information to the display in the reading order. It is nothing more than a thing.

Next, FIGS. 2 (a) to 2 (i) show various display screens for changing the current display screen to a new display screen when the display screen of the display unit 10 shown in FIG. 1 is switched. It is an operation explanatory view including a transitional screen state, and shows an example in which overwriting is performed by shifting in the horizontal direction of the display screen.

Further, FIGS. 3 (a) to 3 (i) similarly,
When switching the display screen of the display unit 10 shown in FIG.
It is an operation explanatory view including various transitional screen states when changing the current display screen to a new display screen, and shows an example in which overwriting is simultaneously performed in the horizontal and vertical directions of the display screen. It is a thing.

Here, in the embodiment shown in FIG. 1, the operation modes when the feed key in the operation key storage portion 11 is operated are shown in FIGS. 2 (a) to 2 (i) and FIG. 3 (a). )
This will be described with reference to (i).

First, in the first operation mode, overwriting is carried out by shifting in the horizontal direction of the display screen.
As shown in (a), when the first information is displayed on the display surface of the display unit 10 as the current display screen and the feed key in the operation key storage unit 11 is operated, the control unit 9 2 sequentially reads the additional information from the internal memory 9a, transfers the read additional information to the display unit 10, and
As shown in (b), the shielding screen is overwritten by using the additional information in a part of the areas on both sides of the current display screen. After that, the control unit 9 displays the data in FIG. 2 (c) and FIG. 2 (d).
As shown in FIG. 2, the overwriting area of the shielding screen in the current display screen is sequentially enlarged from both sides toward the center part, and finally, as shown in FIG. The current display screen is erased by matching the overwriting areas of the screen in the screen with the central part, and the entire display surface of the display unit 10 is switched to the screen. Then, the control unit 9
The second information for one screen on the display surface of the display unit 10 is read from the internal memory 9a in a predetermined order according to the first operation mode, and the read second information is transferred and supplied to the display unit 10, As shown in FIG. 2F, a new display screen is overwritten in the partial area of the central portion of the shield screen using the second information. After that, the control unit 9 performs the process illustrated in FIG.
As shown in (h), the overwrite area of the new display screen in the occlusion screen is sequentially expanded from the central portion toward both sides, and finally, as shown in FIG. 2 (i), The overwrite area of the new display screen in the shield screen is expanded to both sides, the shield screen is erased, and the display surface of the display unit 10 is switched to the new display screen. In this way, the display surface of the display unit 10 is rewritten from the current display image to the new display image.

Next, in the second operation mode, overwriting is simultaneously shifted in the horizontal and vertical directions of the display screen, and as shown in FIG. When the feed key in the operation key storage unit 11 is operated while the first information is displayed as the current display screen, the control unit 9 displays the additional information from the internal memory 9a as in the above example. The additional information that is sequentially read out is transferred and supplied to the display unit 10, and as shown in FIG. 3B, this additional information is used in both side and upper and lower partial areas of the current display screen. Overwrite the shielded screen. afterwards,
As shown in FIGS. 3 (c) and 3 (d), the control unit 9 sequentially expands the overwriting area of the shielded screen on the current display screen from both sides and the upper and lower sides toward the center. Finally, as shown in FIG. 3 (e), the current display screen is erased by matching the overwriting area of the shielding screen in the current display screen in the central portion, and shielding the entire display surface of the display unit 10. Switch to the screen. Subsequently, the control unit 9 reads the second information for one screen on the display surface of the display unit 10 from the internal memory 9a in a predetermined order according to the second operation mode, and reads the read second information. Transfer and supply to the display unit 10,
As shown in FIG. 3F, a new display screen is overwritten by using the second information in a partial area of the central portion of the shielding screen. Thereafter, as shown in FIGS. 3 (g) and 3 (h), the control unit 9 sequentially enlarges the overwrite area of the new display screen on the shield screen from the center toward both sides and the upper and lower sides. Finally, as shown in FIG. 3 (i), as shown in FIG. 3 (i), the overwrite area of the new display screen on the screen is expanded to both sides and upper and lower sides to erase the screen, and the display screen of the display unit 10 is displayed. To a new display screen. In this way, the display surface of the display unit 10 is rewritten from the current display image to the new display image.

In the first and second operation modes, the rewriting of the current display image based on the first information to a new display image based on the second information is performed by changing the brightness of each pixel on the display surface of the display unit 10. Are sequentially changed so as to correspond to the image to be displayed. In the case of the first operation, the brightness of each pixel on the display surface is changed in sequence for each column of the screen. In the case of the second operation, the brightness of each pixel on the display surface is changed in a spiral manner in order.

In the first operation mode, when the current display image based on the first information is overwritten with the shield screen by the additional information, and when a new display image based on the second information is displayed on the shield screen. When overwriting is performed, the curtain formed of the shielding screen is closed or opened, and in the second operation mode, the current display image of the first information is shielded by the additional information. When the screen is overwritten, and when a new display image is overwritten on the shield screen by the second information, the screen is closed and the shutter is closed. It is a thing.

The operation mode selection at the time of rewriting the current display image based on the first information on the display surface of the display unit 10 to the new display image based on the second information is performed according to the operation program in the control unit 9. It can be appropriately determined.

As described above, according to this embodiment, when the current display image based on the first information is rewritten to the new display image based on the second information, the curtain composed of the shielding screen is closed or opened. Or in a manner such that
Since it is performed in such a manner that the shutter composed of the shield screen is closed and opened, the display content is such that it can be visually appealed to the user that the display screen has been switched, and the display period of the shield screen is compared. Even if the display screen is short, the user can immediately visually recognize that the display screen has been switched, and the user may operate the feed key again without knowing that the display screen has been switched. Disappear.

In the above embodiment, the FM multiplex broadcast signal receiver is an on-vehicle FM multiplex broadcast signal receiver. However, the FM multiplex broadcast signal receiver according to the present invention is not limited to the on-vehicle FM multiplex broadcast signal receiver. The present invention is not limited to the multiplex broadcast signal receiver, but is similarly applicable to other types of FM multiplex broadcast signal receivers.

The shield screen used in the present invention is not limited to the curtain pattern shown in FIG. 2 and the film-like screen shown in FIG. Any screen may be used as long as it is not related to the display information.

Furthermore, the shielding screen used in the present invention is
As shown in FIG. 2, it may not include characters at all, or as shown in FIG. 3, it may include characters indicating that the display screen is switched.

[0038]

As described above, according to one embodiment of the present invention, first, a part of the current display screen is overwritten by a part of the shielding screen, and then the current display screen is displayed. The overwriting area of the screen is gradually expanded, and finally,
All of the current display screen is overwritten with all of the occlusion screen,
Next, a part of the shield screen is overwritten with a part of the new display screen, and then the overwrite area of the new display screen in the shield screen is sequentially expanded, and finally the whole shield screen is replaced by the new display screen. Is overwritten by all, and the current display screen is switched to a new display screen, so the transitional display screen at the time of switching is not a non-display screen with no movement but a display screen with movement. In addition, the display screen accompanied by such movement is usually quite different from the display content of the screen displayed on the display unit, and the display content can sufficiently visually appeal that the display screen has been switched. Therefore, even if the display period of the screen accompanied by this movement is relatively short, the user can immediately recognize that the display screen has been switched, and the send key is mistakenly operated again. There is an effect that can eliminate the inconvenience.

According to another embodiment of the present invention,
Overwrite the shield screen on the current display screen (first overwrite)
In addition, in the operation mode in which a new display screen is overwritten on the shield screen (second overwriting), the first overwriting starts from both sides of the display screen in order in the operation mode in which the display screen is horizontally shifted. It spreads toward the central part of the display screen and ends when it reaches the central part of the display screen, and the second overwrite starts from the central part of the display screen and then spreads out to both sides of the display screen in order. When it reaches both sides, it is ended, and the overwriting of the shield screen on the current display screen (first overwrite) and the overwriting of the new display screen on the shield screen (second overwrite) are performed. In either case, in the operation mode in which the display screen is simultaneously shifted in the horizontal and vertical directions,
The first overwrite starts from both sides and the upper and lower sides of the display screen, spreads in the direction of the center of the display screen, and ends when it reaches the center of the display screen, and the second overwrite overwrites the center of the display screen. The first overwriting or the second overwriting is to start from the first part, spread to both sides and upper and lower sides of the display screen, and end when reaching both sides and upper and lower sides of the display screen. Is performed by closing and opening the curtain, or closing and opening the shutter of the camera, so that it is possible to naturally represent the state of transition of the display screen, and the user can The effect of being able to immediately recognize visually that the display screen has been switched without feeling any unnaturalness and eliminating the inconvenience of accidentally operating the feed key again is obtained. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an FM multiplex broadcast signal receiver according to the present invention.

FIG. 2 is an operation explanatory diagram including various transitional screen states when changing the current display screen to a new display screen when the display screen of the display unit shown in FIG. 1 is switched.

FIG. 3 is an operation explanatory diagram including various transitional screen states when changing the current display screen to a new display screen when the display screen of the display unit shown in FIG. 1 is switched.

[Explanation of symbols]

1 FM front end {FM (F / E)} 2 Intermediate frequency amplifier circuit (IFAMP) 3 FM demodulator circuit (FMDET) 4 Multiplexer with noise canceller (NCMP)
X) 5 audio signal amplification circuit (AFAMP) 6 speaker (SP) 7 L-MSK demodulation circuit 8 synchronization / error correction circuit 9 control unit (CPU) 9a internal memory of control unit 9 display unit 11 operation key storage unit

Claims (5)

[Claims] 1. An FM for receiving an FM multiplex broadcast signal containing character information, storing the received character information in an internal memory, and reading the stored character information as appropriate and displaying it on a display unit.
In the multiplex broadcast signal receiver, when switching the display content of the display unit from the current display screen to a new display screen,
First, the shielding screen is overwritten on a part of the current display screen, then the overwrite area of the shielding screen on the current display screen is sequentially expanded, and the shielding screen is overwritten on the entire current display screen. Then, the new display screen is overwritten on a part of the shielding screen, and then the overwrite area of the new display screen in the shielding screen is sequentially expanded, and the new display is displayed on all of the shielding screen. An FM multiplex broadcast signal receiver characterized in that a display screen is switched by overwriting the screen. 2. The overwriting of the shielding screen on the current display screen and the overwriting of the new display screen on the shielding screen are both performed so as to shift the display screen in a horizontal direction. The FM multiplex broadcast signal receiver according to claim 1. 3. The F according to claim 2, wherein the shielding screen is a transition according to an opening / closing operation of a curtain.
M multiplex broadcast signal receiver. 4. The overwriting of the shielding screen on the current display screen and the overwriting of the new display screen on the shielding screen are both performed so as to simultaneously shift the display screen horizontally and vertically. The FM multiplex broadcast signal receiver according to claim 1, wherein 5. The F according to claim 4, wherein the shielding screen is a transition according to an opening / closing operation of a shutter.
M multiplex broadcast signal receiver.