JP4037732B2 - Digital broadcast screen display method and digital broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital broadcast screen display method and a digital broadcast receiver, and more particularly, in IBOC (In-Band On-Channel), which is an American terrestrial digital radio broadcast, according to switching between digital broadcast and analog broadcast. It is suitable for use in a method for controlling display.
[0002]
[Prior art]
[Patent Document 1]
In a system proposed for supplying digital audio broadcasting in the frequency band of AM / FM radio, high sound quality (equivalent to CD for digital FM, equivalent to analog FM for digital AM), various data Higher reception possibility (reception of high-quality audio even under fading and multipath environments) is expected compared to services and current analog broadcast waves.
[0003]
In digital radio broadcasting, data can be broadcast in addition to music, and characters and the like can be displayed on the display device of the receiving terminal. Representative data among the data broadcast from the broadcasting station and displayed on the receiving terminal are a song title, an artist name, a genre name, and the like. In addition, a broadcast station name, a broadcast station genre name, and the like that are conventionally provided in RBDS (Radio Broadcasting Data System) can be displayed on the receiving terminal.
[0004]
However, until the transition to digital audio broadcasting is complete, many broadcasting stations require an intermediate measure to simultaneously transmit analog and digital signals within the same band that is allowed to be used. As a system corresponding to such an intermediate measure, IBOC, which is a terrestrial digital radio broadcast scheduled to start in the United States from the fall of 2003, is currently being developed.
[0005]
This IBOC is characterized by digital broadcasting in the same frequency band as conventional analog broadcasting. That is, as shown in FIG. 5, by adding a digital modulation wave to the sideband of the existing analog AM / FM wave, the current dial position is maintained (On-band) in the current analog radio band (In-Band). Channel) Transmit digital radio broadcasts. The audio parts of analog broadcast and digital broadcast superimposed on the same frequency band are the same broadcast program.
[0006]
An IBOC receiving terminal can perform analog-digital seamless switching using such a feature. For example, a high-quality digital broadcast is normally received and played, but when entering an area where it is difficult to receive the digital broadcast, that is, when the reception intensity of the digital broadcast becomes smaller than a certain value, Automatically switch to analog broadcasting.
[0007]
[Problems to be solved by the invention]
However, when the digital broadcast is switched to the analog broadcast, there is a problem that the accompanying data that has been abundantly displayed when the digital broadcast is received is hardly displayed. In addition, there is a problem that the user may not be aware that the digital broadcasting has been switched to the analog broadcasting, and may give the user an impression that the sound quality has suddenly deteriorated.
[0008]
The present invention has been made to solve such problems, and it is an object of the present invention to be able to continue displaying minimum information even when switching from digital broadcasting to analog broadcasting. .
Another object of the present invention is to enable a user to sensuously recognize that switching from digital broadcasting to analog broadcasting.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, at least a part of data displayed on the screen when digital broadcasting is received is stored in a recording medium, and after switching from digital broadcasting to analog broadcasting is performed. Controls to continuously display at least part of the data displayed on the screen at the time of receiving the digital broadcast based on the data stored in the recording medium.
In another aspect of the present invention, the screen display mode is changed between when digital broadcasts are received and when analog broadcasts are received.
[0010]
According to the present invention configured as described above, even when switching from digital broadcasting to analog broadcasting is performed when entering an area where it is difficult to receive digital broadcasting, the user can explicitly specify the digital broadcasting receiving device. Data that does not change unless operated (broadcast station name, broadcast station genre name, etc.) continues to be displayed until the explicit operation is performed. Or, the data (song title, artist name, genre name, etc.) that may change depending on the broadcast program even if the user does not perform an explicit operation on the digital broadcast receiving device is included in the accompanying data included in the digital broadcast The display continues until the predetermined switching timing.
[0011]
Also, if the screen display mode is changed between digital broadcast reception and analog broadcast reception, it is possible to determine whether the currently received broadcast is digital or analog simply by looking at the screen display. Be able to recognize intuitively.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the digital broadcast receiving apparatus according to the present embodiment. As shown in FIG. 1, the digital broadcast receiving apparatus of this embodiment includes an antenna 1, a tuner 2, a demultiplexer 3, a decoder 4, an audio processing circuit 5, a speaker 6, an operation unit 7, a system controller 8, and a display control circuit 9. The monitor 10 and the memory 11 are provided.
[0013]
The antenna 1 receives IBOC terrestrial digital broadcast in which analog broadcast and digital broadcast are superimposed on the same frequency band. The tuner 2 extracts multiplexed data corresponding to one channel selected by the user by operating the operation unit 7 from the signal received via the antenna 1 based on an instruction from the system controller 8. The extracted multiplexed data is output to the demultiplexer 3.
[0014]
The demultiplexer 3 separates the IBOC multiplexed data supplied from the tuner 2 into data of the main broadcast program and its accompanying data. The main broadcast program is separated into analog broadcast and digital broadcast. The decoder 4 demodulates the data of the broadcast program by a demodulation method corresponding to the modulation method at the broadcast station, performs a predetermined error correction process, and then outputs the resulting data to the audio processing circuit 5.
[0015]
The audio processing circuit 5 generates PCM audio data by performing predetermined processing on the audio data supplied from the decoder 4. The PCM audio data is converted into an analog signal, and the analog signal is amplified with a predetermined amplification factor and output. The speaker 6 outputs sound corresponding to the analog sound signal output from the sound processing circuit 5.
[0016]
The operation unit 7 is for performing reception frequency (channel) switching operation, volume operation, and other various operations, and is configured by, for example, a remote controller (remote controller). The operation information of the operation unit 7 is given to the system controller 8 and controlled by the system controller 8. For example, the channel switching information is supplied from the system controller 8 to the tuner 2 and a designated channel broadcast is selectively received.
[0017]
The system controller 8 controls the entire digital broadcast receiving apparatus of this embodiment. For example, the accompanying data separated by the demultiplexer 3 is taken into the system controller 8. The system controller 8 supplies the accompanying data to the display control circuit 9, thereby displaying the name of the currently receiving broadcast station name, broadcast station genre name, the currently viewed song name, artist name, genre name, etc. on the monitor 10. .
[0018]
Further, the system controller 8 switches between analog broadcasting and digital broadcasting according to the detection signal (received electric field strength detection signal) output from the audio processing circuit 5. In other words, the tuner 2, the demultiplexer 3 and the decoder 4 are normally controlled so as to process and reproduce a high-quality digital broadcast. When the reception intensity of the digital broadcast becomes smaller than a certain value, the digital broadcast is converted into an analog signal. Control to automatically switch to broadcasting.
[0019]
The memory 11 stores at least part of the accompanying data displayed on the screen of the monitor 10 when receiving the digital broadcast. For example, at least the currently receiving broadcast station name and broadcast station genre name are stored among the above-mentioned broadcast station name, broadcast station genre name, song name, artist name, genre name, and the like.
[0020]
Since the accompanying data is supplied from the demultiplexer 3 when receiving the digital broadcast, the system controller 8 supplies the accompanying data to the display control circuit 9 and displays it on the monitor 10 as described above. On the other hand, after switching from digital broadcasting to analog broadcasting, the accompanying data is not supplied from the demultiplexer 3. In this case, by supplying the data stored in the memory 11 to the display control circuit 9, at least a part of the accompanying data displayed on the screen at the time of receiving the digital broadcast (the name of the currently receiving broadcast station, the broadcast The station genre name) is controlled to be continuously displayed on the monitor 10.
[0021]
FIG. 2 is a diagram illustrating an example of a screen displayed on the monitor 10 when switching from digital broadcasting to analog broadcasting. FIG. 2A shows a screen displayed when digital broadcasting is received. As shown in FIG. 2A, when a digital broadcast is received, a wealth of information such as the name of the currently receiving broadcast station, the name of the broadcast station genre, the name of the currently viewed song, the name of the artist, the genre name, and the album name are displayed. Has been. In addition, a digital waveform is displayed so that it can be visually recognized that a digital broadcast is being received.
[0022]
FIG. 2B shows a display screen after switching from digital broadcasting to analog broadcasting. As described above, when switching to analog broadcasting, reception of accompanying data is lost, but even in this case, the name of the currently receiving broadcast station and the name of the broadcast station genre continue to be displayed as shown in FIG. The reception frequency can be displayed in analog broadcasting regardless of the presence or absence of accompanying data.
[0023]
In addition, after switching to analog broadcasting, the waveform display is switched to analog wave so that it can be visually recognized that analog broadcasting is being received. Furthermore, although it is difficult to understand from the drawings, the display color of the backlight and the font of the display characters also change in accordance with switching from digital broadcasting to analog broadcasting.
[0024]
FIG. 2C shows a display screen after switching channels during reception of analog broadcasting. In this case, the broadcast station name and broadcast station genre name that have been displayed based on the data stored in the memory 11 disappear. The system controller 8 described above also performs such control. That is, the system controller 8 stops supplying the data stored in the memory 11 to the display control circuit 9 when the channel switching operation information is input from the operation unit 7.
[0025]
FIG. 3 is a flowchart showing an example of the operation by the system controller 8. In FIG. 3, the system controller 8 controls the tuner 2, the demultiplexer 3 and the decoder 4 so as to receive and reproduce the digital broadcast in the initial state (step S1). Then, the accompanying data included in the digital broadcast is supplied to the display control circuit 9 to display various information on the monitor 10 (step S2).
[0026]
Further, the system controller 8 stores at least a part of the accompanying data (for example, the broadcast station name and the broadcast station genre name) included in the digital broadcast being received in the memory 11 (step S3). At this time, the content of the accompanying data changes according to the content of the main broadcast program, but at least the latest (currently received) information may be stored in the memory 11.
[0027]
During reception of this digital broadcast, the system controller 8 monitors whether or not the reception intensity of the digital broadcast has become smaller than a predetermined value (step S4). If the reception intensity is not lower than the predetermined value, the process returns to step S1 and the digital broadcast reproduction is continued.
[0028]
On the other hand, when the reception intensity of the digital broadcast becomes smaller than a predetermined value, the system controller 8 supplies the data stored in the memory 11 to the display control circuit 9 at that time, so that the name of the broadcast station currently being received And the broadcast station genre name are displayed on the monitor 10 (step S5). At this time, the display mode of the monitor 10 (backlight display color, display character font, received waveform display, etc.) is switched from digital broadcasting to analog broadcasting. Then, the tuner 2, the demultiplexer 3 and the decoder 4 are controlled so as to receive and reproduce the analog broadcast (step S6).
[0029]
During reception of this analog broadcast, the system controller 8 monitors whether or not the channel has been switched by operating the operation unit 7 (step S7). If there is no channel change, it is further determined whether or not the reception intensity of the digital broadcast remains below a predetermined value (step S8). If the reception intensity of the digital broadcast is still smaller than the predetermined value, the process returns to step S6 and the analog broadcast is continuously reproduced. Accordingly, the broadcast station name and the broadcast station genre name are continuously displayed on the monitor 10 unless the channel is changed.
[0030]
On the other hand, when the reception intensity of the digital broadcast becomes larger than a predetermined value, the process returns to step S1 and the reproduction of the digital broadcast is resumed. After the resumption of digital broadcasting, when the accompanying data is displayed on the monitor 10 in step S2, the display mode of the monitor 10 (backlight display color, display character font, received waveform display, etc.) is changed from that for analog broadcasting. Return to digital broadcasting.
[0031]
If it is determined in step S7 that the channel has been changed during reception of the analog broadcast, the system controller 8 stops supplying the data stored in the memory 11 to the display control circuit 9, and the broadcast station name and The display of the broadcast station genre name is deleted from the monitor 10 (step S9). Thereafter, the process proceeds to step S8, where the reception of the analog broadcast is continued or the reproduction of the digital broadcast is resumed according to the reception intensity of the digital broadcast.
[0032]
FIG. 4 is a flowchart showing another example of the operation by the system controller 8. In FIG. 4, the system controller 8 controls the tuner 2, the demultiplexer 3 and the decoder 4 so as to receive and reproduce the digital broadcast in the initial state (step S11). Then, the accompanying data included in the digital broadcast is supplied to the display control circuit 9 to display various information on the monitor 10 (step S12).
[0033]
The system controller 8 also includes accompanying data included in the digital broadcast being received (the name of the currently receiving broadcast station, the name of the broadcast station genre, the name of the currently viewed song, the name of the artist, the genre name, the album name, The reproduction time and the like are stored in the memory 11 (step S13). At this time, the content of the accompanying data changes according to the content of the main broadcast program, but at least the latest information may be stored in the memory 11.
[0034]
During reception of this digital broadcast, the system controller 8 monitors whether or not the reception intensity of the digital broadcast has become lower than a predetermined value (step S14). If the reception intensity is not lower than the predetermined value, the process returns to step S11 and the reproduction of the digital broadcast is continued.
[0035]
On the other hand, when the reception intensity of the digital broadcast becomes smaller than a predetermined value, the system controller 8 supplies the data stored in the memory 11 to the display control circuit 9 at that time, and the name of the broadcast station currently being received or The broadcast station genre name, the name of the currently viewed song, artist name, genre name, album name, etc. are displayed on the monitor 10 (step S15). At this time, the display mode of the monitor 10 (backlight display color, display character font, received waveform display, etc.) is switched from digital broadcasting to analog broadcasting. Then, the tuner 2, the demultiplexer 3 and the decoder 4 are controlled so as to receive and reproduce the analog broadcast (step S16).
[0036]
During reception of this analog broadcast, the system controller 8 monitors whether or not the switching timing determined by the reproduction time of the music stored in the memory 11 has come (step S17). For example, if the music playback time is 5 minutes and 2 minutes have passed since the start of the music, and the digital broadcast is switched to the analog broadcast, it is determined whether or not the remaining 3 minutes have passed. .
[0037]
If it is determined that the remaining reproduction time has elapsed, the supply of data such as the song name, artist name, genre name, album name, etc. stored in the memory 11 to the display control circuit 9 is stopped, and the display is made. Is deleted from the monitor 10 (step S18). After the display is erased, the process proceeds to step S21.
[0038]
On the other hand, when determining that the remaining reproduction time has not yet elapsed, the system controller 8 further determines whether or not the channel has been switched by the operation of the operation unit 7 (step S19). When the channel is changed, the system controller 8 stops supplying the data of the broadcast station name and the broadcast station genre name stored in the memory 11 to the display control circuit 9 and deletes these displays from the monitor 10. (Step S20). After the display is erased, the process proceeds to step S21.
[0039]
After the processing in steps S18 and S20, or when it is determined in step S19 that there is no channel change, the system controller 8 determines whether or not the reception intensity of the digital broadcast remains smaller than a predetermined value (step S21). If the reception intensity of the digital broadcast is still smaller than the predetermined value, the process returns to step S16 and the analog broadcast is continuously reproduced.
[0040]
On the other hand, when the reception intensity of the digital broadcast becomes larger than a predetermined value, the process returns to step S11 and the reproduction of the digital broadcast is resumed. After the resumption of digital broadcasting, when the accompanying data is displayed on the monitor 10 in step S12, the display mode (backlight display color, display character font, received waveform display, etc.) of the monitor 10 is changed from that for analog broadcasting. Return to digital broadcasting.
[0041]
With the above operation, after switching from digital broadcasting to analog broadcasting, at least the name of the currently viewed song, artist name, genre name, album name, etc. are determined in advance by the accompanying data stored in the memory 11. It continues to be displayed on the monitor 10 until the switching timing. Furthermore, the broadcast station name and the broadcast station genre name continue to be displayed on the monitor 10 unless the channel is changed.
[0042]
As described above in detail, according to the present embodiment, at least a part of the accompanying data displayed on the screen at the time of receiving the digital broadcast is stored in the memory 11, and switching from the digital broadcast to the analog broadcast is performed. After that, based on the accompanying data stored in the memory 11, control is performed so that at least a part of the data displayed on the screen at the time of receiving the digital broadcast is continuously displayed.
[0043]
This makes it possible to continue to display the broadcast station name, broadcast station genre name, etc., unless the channel is changed, even if the digital broadcast is switched to the analog broadcast when entering an area where it is difficult to receive the digital broadcast. . Further, information such as a song name, artist name, and genre name can be continuously displayed until the reproduction of the song is completed. Therefore, even after switching from digital broadcasting to analog broadcasting, the user can check the minimum information on the monitor 10.
[0044]
In this embodiment, the screen display mode (backlight display color, display character font, reception waveform display, etc.) is changed between digital broadcast reception and analog broadcast reception. Thus, the user can intuitively recognize whether the currently received broadcast is digital or analog only by looking at the screen display. Therefore, the user can sensuously recognize that the digital broadcasting has been switched to the analog broadcasting.
[0045]
In the above embodiment, the broadcast station name, the broadcast station genre name, the song name, the artist name, the genre name, and the album name are given as examples of the accompanying data displayed on the monitor 10, but these are merely examples. The invention is not limited to this.
[0046]
In the above-described embodiment, the example of changing the display color of the backlight, the font of display characters, and the display of the received waveform between digital broadcast reception and analog broadcast reception has been described. It is not limited to this. For example, characters such as “digital broadcast” or “analog broadcast” may be displayed.
[0047]
In the above embodiment, IBOC has been described as an example of the received digital broadcast, but the present invention is not limited to this. That is, any digital broadcast receiving apparatus configured to receive digital broadcast including music and data accompanying it and switch to analog broadcast in an area where it is difficult to receive the digital broadcast. Applicable. Further, the present invention can also be applied to an apparatus that receives digital broadcasting including video in addition to audio.
[0048]
In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.
[0049]
【The invention's effect】
As described above, according to the present invention, at least a part of data displayed on the screen at the time of receiving digital broadcast is stored in a recording medium, and after switching from digital broadcasting to analog broadcasting is performed, the data is stored in the recording medium. Since the stored data is displayed on the screen, even if it enters an area where it is difficult to receive digital broadcasts, it can continue to display the minimum information even when switching from digital broadcasts to analog broadcasts. become able to.
[0050]
Further, according to another feature of the present invention, the screen display mode is changed depending on whether the digital broadcast is received or the analog broadcast is received. / Analog can be recognized, and the user can sensuously recognize that switching from digital broadcasting to analog broadcasting.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to an embodiment.
FIG. 2 is a diagram showing an example of a screen displayed on a monitor when switching from digital broadcasting to analog broadcasting.
FIG. 3 is a flowchart showing an example of the operation of the digital broadcast receiving apparatus according to the present embodiment.
FIG. 4 is a flowchart showing another example of the operation of the digital broadcast receiving apparatus according to the present embodiment.
FIG. 5 is a diagram showing an FM / AM spectrum by IBOC.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Antenna 2 Tuner 3 Demultiplexer 4 Decoder 5 Audio processing circuit 6 Speaker 7 Operation part 8 System controller 9 Display control circuit 10 Monitor 11 Memory

Claims (12)

In a digital broadcast receiving apparatus configured to receive digital broadcast including music and data accompanying it and to switch to analog broadcast in an area where it is difficult to receive the digital broadcast,
At least a part of the data displayed on the screen when the digital broadcast is received is stored in a recording medium, and after switching from the digital broadcast to the analog broadcast is stored in the recording medium. A screen display method for digital broadcasting, characterized in that, based on the received data, control is performed so that at least a part of the data displayed on the screen at the time of receiving the digital broadcast is continuously displayed. The data that continues to be displayed after switching to the analog broadcast is data that does not change unless the user performs an explicit operation on the digital broadcast receiver, and the data is displayed until the explicit operation is performed. The digital broadcast screen display method according to claim 1, further comprising: 3. The digital broadcast screen display method according to claim 2, wherein the data to be continuously displayed after switching to the analog broadcast is at least one of a broadcast station name and a broadcast station genre name. The data that continues to be displayed after switching to the analog broadcast is data that may change even if the user does not perform an explicit operation on the digital broadcast receiver, and depends on the accompanying data included in the digital broadcast. 2. The digital broadcast screen display method according to claim 1, wherein control is performed so that the data continues to be displayed until a predetermined switching timing. 5. The digital broadcast screen display method according to claim 1, wherein a screen display mode is changed between reception of the digital broadcast and reception of the analog broadcast. 6. The digital broadcast screen display method according to claim 5, wherein a display color of the backlight is changed between when the digital broadcast is received and when the analog broadcast is received. 6. The digital broadcast screen display method according to claim 5, wherein fonts of display characters are changed when the digital broadcast is received and when the analog broadcast is received. 6. The digital broadcast screen display method according to claim 5, wherein display of a received waveform is changed between reception of the digital broadcast and reception of the analog broadcast. A digital broadcast receiving apparatus configured to receive digital broadcast including music and data accompanying it and to switch to analog broadcast in an area where it is difficult to receive the digital broadcast,
Data storage means for storing at least part of the data included in the digital broadcast;
When the digital broadcast is received, the screen is displayed based on the data included in the received digital broadcast, and after switching to the analog broadcast, based on the data stored in the data storage means. A digital broadcast receiving apparatus comprising display control means for controlling to perform screen display. The display control means controls to continuously display data that does not change unless the user explicitly operates the digital broadcast receiving apparatus until the explicit operation is performed after switching to the analog broadcasting. The digital broadcast receiver according to claim 9. The display control means preliminarily changes data that may change even if the user does not perform an explicit operation on the digital broadcast receiving device according to accompanying data included in the digital broadcast from switching to the analog broadcast. The digital broadcast receiving apparatus according to claim 9, wherein the digital broadcast receiving apparatus is controlled to continue displaying until a predetermined switching timing. The said display control means is further controlled to change the mode of a screen display at the time of the reception of the said digital broadcast, and the time of the reception of the said analog broadcast, The any one of Claims 9-11 characterized by the above-mentioned. Digital broadcast receiver.

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