JPH11317681A - Fm multiplex broadcasting transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide in real time an FM multiplex broadcasting transmitter- receiver that selectively receives plural broadcasting programs have different frequencies. SOLUTION: This transmitter-receiver has two receiving systems (receiving circuits) 100 and 200, so that it can simultaneously receive two broadcastings which have different frequencies. A 1st receiving system 100 has a tuner circuit 110 and a decoder circuit 120, and the 2nd receiving system 200 has a tuner circuit 210 and a decoder circuit 220. Only audio signal received by the system 100 is outputted to a loudspeaker (or a headphone) 300 through an AF amplifier 320. A CPU 310 performs switching control of receiving frequencies of the circuits 110 and 210 of each system 100 and 200. Also, the CPU 310 shows receiving data outputted from each circuit 120 and 220 on an LCK display element 340 and on the display of a personal computer.

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 receiving apparatus for receiving FM multiplex broadcasts.

[0002]

2. Description of the Related Art Conventionally, FM multiplex broadcasting has been provided in which data such as characters and graphics different from audio signals is multiplexed and transmitted at the same frequency as that of existing FM radio broadcasting. In the FM multiplex broadcast receiving apparatus for receiving the FM multiplex broadcast, a tuner circuit for receiving the FM multiplex broadcast at an arbitrary frequency, and a decoder circuit for extracting and decoding multiplexed data from a received signal received by the tuner circuit. It has the following.

[0003]

However, the conventional FM multiplex broadcast receiving apparatus has a single receiving circuit and can receive only one broadcast at a time. Therefore, in order to receive a plurality of broadcasts, it is necessary to switch the frequency of the tuner circuit in a time-division manner and receive the broadcasts, and it has not been possible to simultaneously receive a plurality of broadcasts having different frequencies.

[0004] Further, as this kind of FM multiplex broadcast receiving apparatus, there is also provided an apparatus which can be connected to a personal computer via an external interface. However, in this case, on the personal computer side, for example, Windows
Multi-window (multiple display windows) depending on OS such as 95
Despite being a set that can use
Since only one broadcast can be received by one receiving system on the M multiplex broadcast receiving apparatus side, there is a problem that the function of the multi-window cannot be fully utilized.

[0005] Also, two Fs are displayed on one LCD display screen.
A receiving device capable of displaying an M multiplex broadcast program is also provided, but also in this case, since there is only one receiving system, 1
It was only possible to display two programs in broadcasts of one frequency, and it was not possible to select broadcast programs of different frequencies from a plurality of broadcast stations in real time and display them appropriately.

An object of the present invention is to provide an FM receiver capable of selectively receiving a plurality of broadcast programs having different frequencies in real time.
A multiplex broadcast receiving apparatus is provided.

[0007]

In order to achieve the above object, the present invention provides a plurality of receiving circuits for receiving FM multiplex broadcasting at an arbitrary frequency and reproducing voice and data, and a receiving frequency of each of the receiving circuits. And a control circuit for switching control of In the FM multiplex broadcast receiving apparatus according to the present invention, the plurality of receiving circuits receive the FM multiplex broadcast at a reception frequency switched and controlled by the control circuit, and reproduce and output an audio signal or data included in the FM multiplex broadcast. I do. Therefore, by setting the receiving frequencies of the respective receiving circuits to be different from each other, a plurality of broadcast programs having different frequencies can be selectively received in real time.

In addition, as in the conventional case, by controlling the reception frequency of one receiving circuit in a time-division manner, a single receiving circuit can receive a plurality of broadcast programs having different frequencies. By combining such techniques, a large number of various programs can be widely received compared to the number of receiving circuits. Thereby, for example, for a program with high real-time property, reception and display are performed in real time using one of the plurality of receiving circuits, and a plurality of programs with low real-time property are displayed by another receiving circuit in accordance with the attribute of the broadcast program. It is also possible to construct a very convenient system for various broadcasts, for example, by receiving and storing the broadcast in a time-division manner and displaying it as needed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an FM multiplex broadcast receiving apparatus according to the present invention will be described below. FIG. 1 is a block diagram showing a circuit configuration example of an FM multiplex broadcast receiving apparatus according to the present invention. The FM multiplex broadcast receiving apparatus of the present example has two receiving systems (receiving circuits) 100 and 200, and can simultaneously receive two broadcasts having different frequencies. The first receiving system 100 has a tuner circuit 110 and a decoder circuit 120, and the second receiving system 200 has a tuner circuit 210 and a decoder circuit 220.

The antenna 300 is connected to each of the receiving systems 100, 20
0, which is used in common, and receives FM radio waves and supplies them to the tuner circuits 110 and 210. Each tuner circuit 11
Reference numerals 0 and 210 demodulate a signal received from the antenna 300 at a reception frequency controlled by the CPU 310. Then, in the configuration of the present example, the tuner circuit 110 of the first receiving system 100 outputs the received signal to the decoder circuit 120 and the AF amplifier 320. On the other hand, the second receiving system 20
0 tuner circuit 210 outputs the received signal to decoder circuit 2.
20.

Further, each of the decoder circuits 120, 220
It extracts and decodes data included in the received signals from the tuner circuits 110 and 210, and outputs the decoded data to the CPU 310. The AF amplifier 320 amplifies the audio signal from the tuner circuit 110 and outputs the amplified audio signal to a speaker (or headphones) 330. That is, in this example, only the audio signal received by the first receiving system 100 is output to the speaker (or headphone) 330 through the AF amplifier 320.
Is used for receiving a multiplex broadcast of voice and data, and the second receiving system 200 is used exclusively for data reception.

The CPU 310 is a microcontroller that controls the entire FM multiplex broadcast receiving apparatus of this embodiment, and in particular, the tuner circuit 11 of each of the receiving systems 100 and 200 described above.
0, 210 and the decoder circuits 120, 220,
It controls the switching of the reception frequency. Also, the CPU 310
Receives received data output from each of the decoder circuits 120 and 220, outputs the received data to the LCD display element 340, displays the data, negotiates with a personal computer (not shown) through the external interface 350, and receives the data. The control for displaying the data on the display of the personal computer is performed. Also, CP
U310 is based on a key input from the operation unit 360,
A request for selecting a broadcast station or the like is detected, and the above-described control of the reception frequency is performed.

The LCD display element 340 performs graphic display of received data, and has a function of displaying two data on two screens, for example. The personal computer can use multi-window display by an OS such as Windows 95, for example. The operation unit 360 has various input keys for operating the FM multiplex broadcast receiving apparatus. In this example, in particular, in this example, an input for performing two channel selections corresponding to the two receiving systems 100 and 200 is provided. Key. When the apparatus is configured to perform various controls by a command from a personal computer, the operation unit 360 is not required.

In the FM multiplex broadcast receiving apparatus having the above-described configuration, data is displayed on the FM multiplex broadcast received by the first receiving system 100 while audio is reproduced in real time. On the other hand, for FM multiplex broadcasting received by the second receiving system 200, only data display is performed. Therefore, for the first receiving system 100, the operation unit 36
By selecting a broadcasting station that wants to listen to the sound at 0, the CP
U310 sets the receiving frequency corresponding to the broadcasting station to tuner circuit 110 of first receiving system 100, and FM multiplex broadcasting of the broadcasting station is received by first receiving system 100.

For the second receiving system 200, the operating unit 360 selects a broadcasting station from which data is desired to be received, so that the CPU 310 changes the receiving frequency corresponding to the broadcasting station to the tuner of the second receiving system 200. It is set in the circuit 210, the FM multiplex broadcast of the broadcast station is received by the second receiving system 200, and the multiplex data can be displayed on the LCD display element 340. Therefore, the user views the display data of the broadcast received by the second receiving system 200 while viewing the sound and display data of the FM multiplex broadcast received by the first receiving system 100, and displays the display data. When the user wants to hear the sound of the data, by changing the channel selection of the first receiving system 100, the broadcast received by the second receiving system 200 is switched to the first receiving system 100, You can watch sound and display data.

When the channel selection of the first receiving system 100 is changed as described above, the two receiving systems 100 and 200 have the same receiving frequency unless the receiving frequency of the second receiving system 200 is changed. Thus, the same display data is displayed. Therefore, as an operation when the channel selection of the first reception system 100 is switched to the channel selection of the second reception system 200, the reception frequency of the second reception system 200 is changed to the first reception system 1
It is also effective to perform control to automatically switch to the frequency received at 00. In this way, it is possible to provide a convenient system in which the broadcasts of the two broadcast stations are alternately switched, and the sound and the display data can be appropriately selected and viewed.

In addition, since many FM broadcasts include non-multiplexed broadcasts containing only sound, the first receiving system 100 listens to FM broadcasts containing only sound. Then, in this case, the first receiving system 100 receives a broadcast of only sound,
The receiving system 200 can receive a FM multiplex broadcast and display only data. Then, only when it is desired to hear the sound of the FM multiplex broadcast received by the second receiving system 200, the channel selection of the first receiving system 100 is changed.

In the above example, an apparatus has been described in which sound and data can be viewed in the first receiving system 100 and only data can be viewed in the second receiving system 200. A configuration in which sound can be selectively heard may be adopted. FIG. 2 is a block diagram showing a circuit configuration example of the FM multiplex broadcast receiving apparatus in this case. Elements common to the configuration shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The FM multiplex broadcast receiving apparatus shown in FIG.
And a switch 370 for selectively switching the line of the audio signal input from the tuner circuits 110 and 210 to the AF amplifier 320. The switch 370 is controlled to be switched by the CPU 310 based on, for example, operation of a voice selection key provided on the operation unit 360. For example, when FM multiplex broadcasting is received by both of the two receiving systems 100 and 200, the broadcast of which the user wants to listen to is designated by operating the audio selection key, so that the audio of the designated broadcast can be easily switched. Can hear.

The FM shown in FIG. 1 and FIG.
In the multiplex broadcast receiving apparatus, two receiving systems 100 and 20
In addition to the method of receiving broadcasts of different frequencies at the same time at 0 and combining the method of receiving and switching the reception frequency in a time-division manner with one reception system as in the related art,
Further, various receiving methods can be adopted. For example, FIG.
In the FM multiplex broadcast receiving apparatus shown in FIG.
If the data of two broadcasting stations are received by switching in a time-division manner at 00, reception of three broadcasting stations in addition to FM multiplex broadcasting of one broadcasting station received by the first receiving system 100 is performed. Can be performed.

In general, data of FM multiplex broadcasting can be received completely in about 5 minutes in a radio wave environment where the electric field strength is sufficient. The programs to be received include a sequential program such as program information and an independent program such as a weather forecast. Therefore, first, each of the receiving systems 100 and 200
To start receiving two broadcasts. After this, the second
When the reception of one program data has been completed by the reception system 200, or when a predetermined time has elapsed, the reception frequency of the second reception system 200 is switched, and the reception of the third broadcast is started. When the reception of one program data by the second receiving system 200 is completed, or when a predetermined time has elapsed, thereafter, the frequency of the second receiving system 200 is switched at regular intervals, Respond to data updates.

In the above receiving method, 3
It is possible to display received data of one broadcasting station in parallel by providing three windows on an LCD display element or a display of a personal computer. In this case, regarding the reception data of the second reception system 200, the previous data is continuously displayed until the data of each broadcast is updated regardless of the frequency switching.

In the above description, the two receiving systems 10
A plurality of display data received in parallel at 0, 200
It has been described that the data is displayed in parallel on the D display element or the display of the personal computer. However, it is not always necessary to adopt a use method of performing two displays, and data is selectively displayed on one display screen by a user's selection. You may employ the usage method which does. Further, in the above example, a case where two receiving systems are provided has been described, but three or more receiving systems may be provided.

[0024]

As described above, the FM multiplex broadcast receiving apparatus according to the present invention is provided with a plurality of receiving circuits for receiving FM multiplex broadcasts at arbitrary frequencies and reproducing voice and data, respectively. The frequency is switched and controlled. Therefore, by setting the receiving frequencies of the receiving circuits to be different from each other, there is an effect that a plurality of broadcast programs having different frequencies can be selectively received in real time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first circuit configuration example of an FM multiplex broadcast receiving apparatus according to the present invention.

FIG. 2 is a block diagram showing a second circuit configuration example of the FM multiplex broadcast receiving apparatus according to the present invention.

[Explanation of symbols]

100: receiving system, 110, 210: tuner circuit,
120, 220: decoder circuit, 300: antenna, 310: CPU, 320: AF amplifier, 330
…… speaker, 340 …… LCD display element, 350 ……
External interface, 360: operation unit, 370: switch.

Claims (6)

[Claims] 1. A plurality of receiving circuits each receiving an FM multiplex broadcast at an arbitrary frequency and reproducing audio and data, and a control circuit for switching and controlling a receiving frequency of each of the receiving circuits. FM multiplex broadcast receiving device. 2. The FM multiplexing apparatus according to claim 1, further comprising: an audio output unit for outputting audio received by each of said receiving circuits; and a data output unit for outputting data received by each of said receiving circuits. Broadcast receiver. 3. The plurality of receiving circuits each include a tuner circuit for receiving an FM multiplex broadcast at an arbitrary frequency, and a decoder circuit for decoding data from a received signal received by the tuner circuit. Claim 1
13. The FM multiplex broadcast receiving apparatus according to claim 1. 4. The apparatus according to claim 1, wherein the plurality of receiving circuits receive FM multiplex broadcasting from a common antenna.
13. The FM multiplex broadcast receiving apparatus according to claim 1. 5. The FM multiplex broadcast receiving apparatus according to claim 1, further comprising an interface circuit for outputting signals received from said plurality of receiving circuits to an external device. 6. The FM multiplex broadcast receiving apparatus according to claim 1, further comprising a storage circuit for storing received signals from said plurality of receiving circuits.