JP3593269B2 - Audio system capable of receiving teletext - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an audio system capable of receiving teletext, and more particularly to an audio system capable of receiving teletext with an improved text information receiving function of FM teletext.
[0002]
[Prior art]
Various sound sources such as CDs, tape recorders, MDs, AM and FM broadcasts, and television broadcasts are employed as sound sources used in audio systems capable of receiving text broadcasts. Such an audio system capable of receiving text broadcasting is provided with a display for displaying the state and information of a sound source. For example, when a CD is selected as a sound source, as shown in FIG. 4, "CD" is displayed on the display 101, a track number, a reproduction time, and the like are displayed on the display 102. The band, frequency, reception status, etc. are displayed. Switching between these sound sources is performed by operating an equipped selector.
[0003]
In recent years, in order to effectively utilize the frequency of FM broadcasting, character information is multiplexed and transmitted to unused gap frequency bands among allocated frequency bands, and the multiplexed FM is transmitted to the receiver side. The market for audio systems capable of receiving text broadcasts having a so-called visible radio function of receiving and decoding data and displaying text information on a display device is also expanding.
[0004]
In a conventional audio system capable of receiving teletext broadcasting of this type, in a visible radio function operation, a tuner is selected by a selector, an FM band is received, FM multiplex data is decoded, and text information is displayed on a display. .
[0005]
[Problems to be solved by the invention]
By the way, when the selector selects the tuner, the reception frequency of the radio broadcast station is displayed on the display, so that the user can visually recognize the reception band and the reception frequency. Can be determined.
[0006]
However, when the selector selects a sound source other than the tuner, for example, a CD or MD, the information on the sound source is displayed on the display as described above, and the reception frequency is not displayed at all. It cannot be determined whether or not is receivable.
[0007]
Conventionally, when the output of a decoding circuit for decoding teletext data has not been present for a predetermined time or more, it is determined that the broadcast is not teletext, that is, it is impossible to receive FM multiplexed data. Therefore, when a sound source other than the tuner is selected by the selector, when it is desired to receive a text broadcast, it is only after the lapse of the certain time that it is necessary to know that the text broadcast cannot be received. It was difficult to respond.
[0008]
Therefore, an object of the present invention is to provide an audio system capable of receiving a text broadcast capable of promptly informing whether or not a text broadcast can be received even when a sound source other than a tuner is selected.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an audio system capable of receiving teletext according to the present invention employs the following characteristic configuration.
[0010]
(1) It has a function of reproducing and outputting a broadcast station sound source that receives an FM / AM frequency with a tuner and outputs sound, and a function of reproducing and outputting a sound source other than the broadcast station sound source. In the audio system capable of receiving a text broadcast in which an FM signal in which text information is FM-multiplexed with an empty frequency of the FM frequency and corresponding text information is displayed on a display, the other sound source is selected by the selector. When the reception band of the tuner is AM, the text broadcast receivable audio for executing the reception of the FM multiplexed data by changing the reception frequency of the tuner to the frequency of the FM multiplexed data received immediately before. system.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of an audio system capable of receiving teletext according to the present invention will be described below with reference to the accompanying drawings.
[0014]
FIG. 1 is a block diagram showing the basic configuration of an audio system capable of receiving teletext according to the present invention. In the present embodiment, radio, CD, and MD are used as sound sources, and these sound sources are switched by the selector 120, and character information by a visible radio function is displayed. CPU 100 controls the entire system including the above.
[0015]
The character information by the visible radio function is displayed on the display 101, and the display 102 displays the reception frequency of the tuner unit. These display controls are performed by the display control unit 103 controlled by the CPU 100. CD 108, MD 109 as a sound source, FM receiving section 114, AM receiving section 116, tuner section 115, and FM text multiplex broadcast receiving section 113 receiving an FM signal from FM receiving section 114, which constitute a tuner such as FM or AM, A multiplex data decoding circuit 112 for decoding multiplex data of the teletext signal is provided.
[0016]
Operation information from the power switch 118, the FM multiplex reception ON / OFF switch 119, the selector 120, and the reception band changeover switch 121 is sent to the CPU 100 via the key operation unit 117. That is, the system operation is turned on by the power switch 118, the visible radio function is turned on / off by the FM multiplex reception ON / OFF switch 119, the tuner function and the reproduction function such as CD and MD are selected by the selector 120, and the reception band is selected. The changeover switch 121 switches the band of the tuner such as FM and AM.
[0017]
The character code storage unit 104 stores character codes corresponding to characters to be displayed. The FM reception frequency storage unit 105 stores FM reception frequency information. FM multiplex reception determination / storage section 106 determines whether or not the FM frequency band being received is broadcasting text information and stores the result.
[0018]
FM multiplex station frequency storage section 107 stores FM frequencies for performing teletext. The selector information storage unit 110 stores information about the sound source selected by the selector 120, and the reception band information storage unit 111 stores reception band information from the tuner unit 115.
[0019]
FIG. 2 is a flowchart showing an operation processing procedure of an embodiment of an audio system capable of receiving teletext according to the present invention.
[0020]
In the present embodiment, the operation when the selector 120 selects a sound source other than the tuner is described. Therefore, in this case, as shown in FIG. 4, the display 101 displays the sound source (CD in this example) selected by the selector 120, and the display 102 displays information about the CD (for example, CD). , The playback CD number and the playback time) are displayed, and the user does not know at all whether or not the character information can be received.
[0021]
First, the CPU 100 receives and processes the decoded output of the FM multiplexed data by the multiplexed data decoding unit 112 based on the FM signal from the tuner unit 115, and determines whether or not the FM multiplexed data reception is OK (step S101). This determination includes determination as to whether the reception electric field strength is weak and continuous reception is possible. Here, if it is determined that FM multiplex data reception is possible (OK), “1” is stored as data indicating the FM multiplex mode in the FM multiplex reception determination / storage unit 106 (step S102), and reception is not possible (step S102). If it is determined as NG, “2” is stored in the FM multiplex reception determination / storage section 106 as data indicating that the mode is not the FM multiplex mode (step S103), and the process proceeds to step S104.
[0022]
In step S104, it is determined whether the FM multiplex reception ON / OFF switch 119 has been turned ON and the user desires to receive a text broadcast. This determination is made by the CPU 100 that has received the operation information from the FM multiplex reception ON / OFF switch 119 via the key operation unit 117. In step S104, if the ON operation has not been performed, the process ends. If the ON operation has been performed, the sound source (CD, MD, etc.) selected by the selector 120 is stored in the selector information storage unit 110.
[0023]
Subsequently, in step S106, it is determined whether the current reception band is FM. Here, if it is not in the FM band (NO), it is impossible to receive a text broadcast, so that it is immediately displayed as a "data cannot be received" display, for example, for 3 seconds (step S109), and then in step S105 Information about the sound source (CD in this example) selected by the stored selector 120 is displayed on the displays 101 and 102 as shown in FIG.
[0024]
On the other hand, if the reception band is FM in step S106 (YES), the data stored in FM multiplex reception determination / storage section 106 is “2”, that is, FM multiplex data reception is impossible (NG) ) Is determined (step S107).
[0025]
If the determination in step S107 is “2” (YES), and it is determined that FM multiplexed data reception is not possible (NG), the processes in steps S109 and S110 are performed to execute “data reception”. "Cannot be performed" and a display relating to the sound source selected by the selector 120 are performed.
[0026]
If it is determined in step S107 that FM multiplex data reception is not impossible (not NG: other than “2”), the data stored in the multiplex reception determination / storage unit FM106 is “1”. , That is, whether the mode is the FM multiplex mode (step S108).
[0027]
In step S108, when it is determined that it is not "1" (NO), the process is terminated, and when it is determined that it is "1" and the FM multiplex mode is set, a "visible radio" display operation is executed. (Step S111), the current frequency is stored in the FM multiplex station frequency storage unit 107 as the FM multiplex station frequency (step S112), and the process ends.
[0028]
FIG. 3 is a flowchart showing an operation processing procedure of another embodiment of the audio system capable of receiving teletext according to the present invention.
[0029]
This embodiment also relates to the operation when the selector 120 selects a sound source other than the tuner, as in FIG.
[0030]
In the present embodiment, first, the FM reception frequency that is currently being received is stored in the FM reception frequency storage unit 105 (step S201), and then, based on the FM signal from the tuner unit 115, as in the process of step S101 described above. Then, the CPU 100 receives and processes the decoded output of the FM multiplexed data by the FM multiplexed data decoding unit 112, and determines whether the reception of the FM multiplexed data is OK (step S202). If it is determined that FM multiplex data reception is possible (OK), “1” is stored as data indicating the FM multiplex mode in the FM multiplex reception determination / storage unit 106 (step S203), and the current frequency Is stored in the multi-station frequency storage FM section 107, and the process proceeds to step S206.
[0031]
If it is determined in step S202 that the FM multiplex data cannot be received (NG), “2” is stored in the FM multiplex reception determination / storage unit 106 as data indicating that the mode is not the FM multiplex mode (step S204). ), The process proceeds to step S206.
[0032]
In step S206, it is determined whether or not the FM multiplex reception ON / OFF switch 119 has been turned ON and the user desires to receive a text broadcast. This determination is made by the CPU 100 that has received the operation information from the FM multiplex reception ON / OFF switch 119 via the key operation unit 117. In step S206, if the ON operation has not been performed (NO), the process ends. If the ON operation has been performed (YES), the sound source (CD, MD, etc.) selected by selector 120 is stored in selector information storage unit 110. It is stored (step S207).
[0033]
Subsequently, in step S208, it is determined whether the current reception band is FM. Here, if the frequency band is not the FM band, the frequency is changed to the FM station frequency stored in the FM reception frequency storage unit 105 in step S201 described above (step S209), and the process proceeds to step S212.
[0034]
On the other hand, when the reception band is FM in step S208, whether the data stored in the multiplex reception determination / storage unit FM106 is “2”, that is, whether FM multiplex data reception is impossible (NG) It is determined whether or not (step S210).
[0035]
If the determination in step S107 is “2” and it is determined that FM multiplexed data reception is not possible (NG), text broadcast reception is not possible, and this fact is immediately indicated as “data cannot be received”. As a display, for example, after displaying for three seconds (step S213), a display relating to the sound source (in this example, CD) selected by the selector 120 stored in step S207 is displayed on the displays 101 and 102 (step S214). .
[0036]
If it is determined in step S210 that FM multiplex data reception is not impossible (not NG), the frequency is changed to the FM station frequency which is the FM multiplex station stored in the frequency storage multiplex station FM unit 107. Then (step S211), the process proceeds to step S212.
[0037]
In step S212, it is determined whether the data stored in multiplex reception determination / storage section FM106 is "1", that is, whether or not the mode is the FM multiplex mode.
[0038]
Here, if it is "1" and it is determined that the mode is the FM multiplex mode, the "visible radio" display operation is executed (step S215), and the current frequency is set to the FM multiplex station frequency and the multi-station frequency storage FM is set. The information is stored in the unit 107 (step S216), and the process ends.
[0039]
If it is determined in step S212 that FM multiplexed data cannot be received (NO), the processing in steps S213 and S214 is performed. That is, for example, after a "data cannot be received" display is displayed for, for example, three seconds, a display relating to the sound source selected by the stored selector 120 is displayed on the displays 101 and 102.
[0040]
The important processing of the present invention in the above description is the following processing, and an effective effect can be obtained by this. However, it is needless to say that the present invention is not limited to these.
(1) When a visible radio display (FM multi-character display) cannot be performed, the current selector position is stored in order to return to the original selector display.
(2) Check the current reception band.
(3) After displaying that the visible radio function cannot be used, the original selector display is performed.
(4) When the reception band is FM, it is checked whether the FM station is an FM multiplex station.
(5) If the receiving band is not FM, change to the FM station that was receiving last.
(6) If the reception band is FM and if it is not an FM multiplex station, change to the FM multiplex station stored in the next (7).
(8) When FM multiplexing is OFF, it is checked in advance whether the currently receiving broadcast station is an FM multiplexing station.
[0041]
【The invention's effect】
As described above, according to the audio system capable of receiving teletext according to the present invention, even if the sound source selected by the selector is a sound source other than a tuner, such as a CD or MD, it is desirable to receive teletext. Promptly and in various ways, and the convenience of the user is remarkably improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an audio system capable of receiving teletext according to the present invention.
FIG. 2 is a flowchart showing a processing procedure of an embodiment of an audio system capable of receiving teletext according to the present invention.
FIG. 3 is a flowchart showing a processing procedure of another embodiment of the audio system capable of receiving teletext according to the present invention.
FIG. 4 is a diagram showing a display example of a display of an audio system capable of receiving a text broadcast when a CD is selected as a sound source.
[Explanation of symbols]
100 CPU
101 display 102 display 103 display control 104 character code storage 105 FM reception frequency storage 106 FM multiplex reception determination / storage 107 FM multiplex station frequency storage 108 CD
109 MD
110 selector information storage unit 111 reception band information storage unit 112 multiplex data decoding circuit 113 FM text multiplex broadcast reception unit 114 FM reception unit 115 tuner unit 116 AM reception unit 117 key operation unit 118 power switch 119 FM multiplex reception ON / OFF switch 120 selector 121 reception band changeover switch

Claims (1)

It has a function of reproducing and outputting a broadcast station sound source that receives an FM / AM frequency by a tuner and outputs sound, and a function of reproducing and outputting a sound source other than the broadcast station sound source. In an audio system capable of receiving a text broadcast in which an FM signal in which text information is FM-multiplexed in an available frequency and displaying the corresponding text information on a display, the other sound source is selected by the selector, When the reception band of the tuner is AM, the reception frequency of the tuner is changed to the frequency of the FM multiplexed data received immediately before, and the reception of the FM multiplexed data is performed. Audio system.

Images