JP2003110443A - Fm broadcast transmission and reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an FM broadcast transmission and reception system which saves the inconvenience of synchronizing the broadcasting sound and display by controlling so as to automatically tune with received frequencies of an FM tuner for general broadcast reception and an FM multiplex receiver to same frequency. SOLUTION: The FM broadcast transmission and reception system is provided with the FM multiplex receiver 130 which has an FM multiplex receiving section 134 being arranged in a navigation device N and demodulating received FM multiple data and a display section 10a displaying the demodulated FM multiple data and with the FM tuner 160 which receives FM broadcast. The navigation device N, in the case that information of frequency transmission is inputted in a channel select section 163 of the FM tuner 160, is provided with a frequency tuning section 47 performing the frequency transformation in a channel select section 133 of the FM multiplex receiver 130, thereby, tuning each received frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for receiving FM broadcasts, and more particularly to an FM broadcast receiving system capable of receiving FM multiplex data such as character information multiplexed in FM broadcasts.

[0002]

2. Description of the Related Art At present, FM multiplex broadcasting, in which character information and the like are multiplexed and broadcasted, has been put into practical use. This FM
In the multiplex broadcasting, character information is encoded, multiplexed into an FM stereo audio signal, and transmitted. Such FM
In the receiver that receives the multiplex broadcast, it is possible to display, on the display, the voice similar to the conventional FM broadcast as well as the character information related thereto. As a result, the user can instantly visually recognize the title of the song played at that time in the FM broadcast, the name of the singer performing the song, and the like.

Further, a receiver for receiving the FM multiplex broadcast is provided in a navigation device for guiding a moving body such as an automobile, and desired data such as traffic information of multiplexed VICS service is taken out for navigation. The technology for displaying on the display has been put to practical use. The car audio system for a vehicle has a built-in FM tuner for receiving a general FM broadcast. However, if the reception frequency of this navigation device is matched with the reception frequency of the FM tuner, the information flowing from the car audio will be transmitted. Character information and the like related to can be displayed on the display for navigation.

[0004]

By the way, the FM tuner in the above-mentioned car audio system is constructed separately from the FM multiplex receiver in the navigation system. Therefore, when the user listens to the broadcast sound from the FM tuner and sees the character information and the like displayed on the navigation display according to the sound, the display on the display is changed when the FM tuner broadcast station is switched. Remains unchanged, unchanged. In order to deal with this, it is necessary to open the menu of the navigation system and switch to the same broadcasting station as the FM tuner, which is troublesome.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and its object is to automatically adjust the reception frequency of an FM tuner for general broadcast reception and an FM multiplex receiver. It is an object of the present invention to provide an FM broadcast receiving system that saves the trouble of matching the broadcast sound and the display screen by controlling the same in the same frequency.

[0006]

In order to achieve the above object, the invention according to claim 1 is such that a receiver for receiving an FM broadcast demodulates a channel selection section for selecting a reception frequency and the received FM multiplex data. In an FM broadcast receiving system having an FM multiplex data demodulation unit and a display unit for displaying demodulated FM multiplex data, when the frequency change information from another receiver is input to the channel selection unit. A receiving frequency control unit for changing the receiving frequency according to the above is connected.

According to a second aspect of the present invention, in an FM broadcast receiving system including a pair of receivers for receiving FM broadcasts, each of the pair of receivers has a channel selection section for selecting a reception frequency. The receiver of the received FM
An FM multiplex data demodulation unit for demodulating the multiplex data and a display unit for displaying the demodulated FM multiplex data are provided, and the channel selection unit of one receiver has information on frequency change in the channel selection unit of the other receiver. When is input, a reception frequency control unit for connecting the reception frequencies of the receivers to each other by changing the frequency in the channel selection unit is connected.

According to the above-mentioned inventions of claims 1 and 2, in the receiver listening to the sound in the general broadcast, the FM multiplex data is displayed on the display unit even when the broadcast station is changed. Since the broadcasting station of the receiver being displayed can be automatically matched with this, there is no need to change the display.

The invention according to claim 3 is the F according to claim 2.
In the M-broadcast receiving system, the reception frequency control unit includes a communication unit that transmits the frequency change information in the channel selection unit of the other receiver to the one receiver.

In the invention according to claim 3 as described above, even if the pair of receivers are respectively configured in different housings, the frequencies can be linked via the communication means, so that in the vehicle interior or the like. The degree of freedom of arrangement increases.

According to a fourth aspect of the present invention, in the FM broadcast receiving system according to any one of the first to third aspects, the frequency change information includes the changed frequency, and the reception frequency control is included. The unit determines the frequency after the change, the determination unit that determines whether or not the received frequency in the channel selection unit of the receiver to which it is input, and when it is determined that the frequency does not match by the determination unit. And a frequency interlocking device for matching the received frequency in the tuning unit with the changed frequency.

In the invention according to claim 4 as described above, when the broadcast station is changed in the receiver listening to the sound in the general broadcast, the changed broadcast station and FM multiplex data are displayed on the display unit. If the broadcasting station of the receiver being displayed is different, it can be automatically matched, so there is no need to change it. If the broadcast station after the change of the receiver listening to the sound in the general broadcast matches the broadcast station of the receiver displaying the FM multiplex data on the display unit, the change is not necessary.

According to a fifth aspect of the present invention, in the FM broadcast receiving system according to any one of the first to fourth aspects, there is provided switching means for switching between presence and absence of frequency change control by the reception frequency control section. And

In the invention according to claim 5 as described above, F
When it is not necessary to interlock the frequency of the receiver for displaying M multiplex data, the frequency change control can be set not to be performed.

According to a sixth aspect of the present invention, in a receiver having the FM multiplex data demodulation section and the display section, a route for a mobile body to reach a destination from a starting point is displayed on the display section. It is characterized in that it is connected to a navigation device for guiding.

According to the invention described in claim 6 as described above, for example, the FM multiplex data can be displayed on the display unit together with the guidance display by the on-vehicle navigation device, and the broadcast station receiving the car audio can be displayed. Voice and F
Since it is possible to automatically match the display of the M multiplex data, there is no need to change.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention (hereinafter referred to as "embodiments") will be specifically described with reference to the drawings. Note that the part related to information processing in this embodiment is typically realized by controlling a computer with software. The software in this case realizes the action and effect of the present invention by physically utilizing the hardware of the computer, and has the features of the present invention based on the existing technology. However,
In this case, the specific types and configurations of hardware and software, the range processed by software, and the like can be changed in various ways. Therefore, in the following description, virtual circuit blocks that realize the respective functions of the present invention and the embodiments will be described. To use.

[1. Configuration of Embodiment] First, in the present embodiment, a navigation device provided with an FM multiplex receiver and an FM configured as a part of an in-vehicle audio system.
It's about a system made up of tuners,
It can also be understood as software for realizing each of these functions.

[1-1. Overall System Configuration] FIG.
It is a functional block diagram of this embodiment. As shown in FIG. 1, the present embodiment is configured so that frequency change information can be exchanged between the navigation device N and the FM tuner 160.

[1-2-1. Configuration of Navigation Device] First, the navigation device N includes an absolute position / direction detecting unit 1, a relative direction detecting unit 2, a vehicle speed detecting unit 3, and a main CP.
U and its peripheral circuit 4, memory group M, user interface unit 9, display unit 10a, voice output unit 10b, input unit 1
1, a CD / DVD-ROM control unit 12, an FM multiplex receiver 130, an optical / radio wave beacon reception and processing unit 14, and a voice recognition unit 15.

Of these, the absolute position / direction detecting unit 1 calculates the absolute position coordinates and direction on the ground surface for the current position of the automobile (referred to as the own vehicle) in which this device is mounted, that is, the own vehicle position. Therefore, for example, it is a part for receiving GPS radio waves sent from GPS satellites by an antenna or a receiver. The relative azimuth detecting unit 2 is a unit for detecting the relative azimuth of the vehicle using a gyro or the like. The vehicle speed detection unit 3 is a unit that calculates the speed of the vehicle by processing a vehicle speed pulse obtained from the vehicle.

Further, the main CPU and its peripheral circuit 4
Is a part that plays the role of a control circuit that controls the entire apparatus. The memory group M is various kinds of memory necessary for the operation of the present apparatus. For example, a DRA that stores a program, loads a ROM accessed by the main CPU at startup, a main program, and provides a work area and the like.
It includes M (dynamic RAM), SRAM (static RAM) that backs up information such as settings even when the main power is turned off, and VRAM (VideoRAM) for display.

The user interface section 9 uses an I / O control circuit, a device driver, etc. to display the display section 10a,
It is a user interface that connects the audio output unit 10b and the input unit 11 to the main CPU and its peripheral circuit 4. The display unit 10a and the voice output unit 10b do not show various information such as a guide map (including stereoscopic display and landmark display), an operation menu, characters and figures of the multiplex data received by the FM multiplex receiver 130. This is a part to be output on a display screen or voice synthesis. The input unit 11 is a part for the user to input information such as commands and numerical values from switches and joysticks on the front panel and remote control, and selects, for example, a desired point on the map, a landmark, a menu button, or the like. (Including operations such as channel selection), scroll operation input, display / setting switching instruction input, etc. can be performed.

The display unit 10a, like the input unit 11, can function as an input unit by directly touching an arbitrary point on the map displayed on the screen, a menu button or the like with a finger. Also has a function as.

Further, the CD / DVD-ROM control unit 12
Is a means for reading out various information recorded in a CD-ROM or a DVD-ROM, and is means for preliminarily storing map information indicating where and what kind of roads and facilities there are.
As will be described later, the FM multiplex receiver 130 is a part that receives FM broadcast waves and extracts desired data such as traffic information of VICS service from the broadcast waves. The light / radio wave beacon reception / processing unit 14 is a unit that receives and processes information such as identification information of each beacon and traffic information of the VICS service from an optical beacon or a radio wave beacon installed on a road shoulder. The voice recognition unit 15 is a unit that recognizes a word such as a command word from the input user's utterance.

Further, the main CPU and its peripheral circuit 4
The destination setting unit 41, the current position calculation unit 42, the route calculation unit 43, the guide unit 44, the drawing unit 45, the determination unit 46, and the frequency interlocking unit 4 are operated by the software as described above.
7, the setting switching unit 48, and the multiplex data processing unit 49.

The destination setting section 41 is a designation means for designating a facility to be a destination from the facilities included in the map information. The current position calculation unit 42 is a means for calculating the current position of the own vehicle, that is, the own vehicle position. Specifically, the current position calculation unit 42 calculates the own vehicle position by combining GPS navigation positioning and autonomous navigation positioning. Is configured. Here, the GPS navigation positioning calculates the current position by using the information obtained from the absolute position / azimuth detecting unit 1 based on the radio wave from the artificial satellite. Further, the autonomous navigation positioning calculates the current position using the information obtained from the relative azimuth detecting unit 2 and the vehicle speed detecting unit 3 based on the acceleration of the own vehicle.

The route calculation unit 43 is means for calculating and setting an optimum route from the current position to the designated destination. The guide unit 44 is means for providing route guidance by screen display, synthesized voice, or the like based on the set route. The drawing unit 45 is means for drawing the display content displayed on the display unit 10a based on the information passed from each of the other units.

The decision unit 46 determines that the changed reception frequency input from the FM tuner 160 is the FM multiplex receiver 130.
It is a means for determining whether or not it matches the current reception frequency in. When the determining unit 46 determines that the frequencies do not match, the frequency interlocking unit 47 sets the reception frequency in the FM multiplex receiver 130 to the FM tuner 16
It is a means for instructing to match the reception frequency at 0. The setting switching unit 48 is means for switching the setting as to whether or not the frequency interlocking control by the frequency interlocking unit 47 is activated according to the input from the input unit 11. The multiplex data processing unit 49 is means for controlling the multiplex data such as characters and figures from the FM multiplex receiver 130 to be displayed on the display unit 10a.

[1-2-2. Configurations of FM Multiplex Receiver and FM Tuner] Next, configurations of the FM multiplex receiver 130 and the FM tuner will be described with reference to FIG. First, FM
The multiplex receiver 130 and the FM tuner 160 have FM detection circuits 131 and 161, PLL circuits 132 and 162, and channel selection units 133 and 163 as similar components. The FM detection circuits 131 and 161 mix the received broadcast radio wave from the antenna with a predetermined frequency signal supplied from the PLL circuits 132 and 162 according to the tuning, and convert the selected frequency signal to an intermediate frequency. A means for amplifying and detecting this, and outputting a detection signal whose voltage level changes according to the frequency.

The PLL circuits 132 and 162 are frequency dividers (1 / (1 / n) whose N value is changed depending on the frequency to be received, depending on the selection by the reference oscillator and the tuning units 133 and 163.
N), a phase comparator that compares the phase of the output signal from the reference oscillator and the phase of the output signal from the frequency divider, and outputs a predetermined frequency to the FM detection circuits 131 and 161 according to the output signal from the phase comparator. And a local oscillator that operates. Channel selection section 1
33 and 163 are means for outputting the changed frequency information corresponding to the selected station in response to a tuning operation from the input unit 169 such as a preset key or the input unit 11 of the navigation device N.

Further, the FM multiplex receiver 130 has an FM multiplex receiver 134 in addition to the above configuration. This F
The M multiplex reception unit 134 separates the multiplex data multiplexed in the FM broadcast wave, and the display unit 1 of the navigation device N.
0a is a means for generating and outputting data, and a multiplex detection circuit for demodulating a coded multiplex signal, a block synchronization circuit for determining the presence or absence of multiplex information, an error correction circuit for correcting an error in received data, and each frame It has a frame memory for storing data, a page coupling circuit for coupling a plurality of data, and the like. It should be noted that the display control of the navigation device N can be performed to search the displayed page, convert a preset character string font, and the like.

Further, the FM tuner 160 has an FM stereo demodulation circuit 164 and an amplifier 16 in addition to the above configuration.
5, a change frequency detection unit 166, a communication control unit 167, and the like. The FM stereo demodulation circuit 164 is means for demodulating a normal audio signal of the detection signals from the FM detection circuit 161 into left and right stereo audio signals. Amplifier 16
Reference numeral 5 is a means for amplifying the stereo audio signal demodulated by the FM stereo demodulation circuit 164 so that it can be reproduced by the speaker 168. Change frequency detector 1
66 is based on the signal output from the channel selection unit 163,
It is a unit that detects a change in frequency, generates and outputs information about the change in frequency and the frequency after the change.
The communication control unit 167 is a unit that transmits the information about the frequency change and the changed frequency to the navigation apparatus N by wire or wirelessly.

[2. Operation of Embodiment] The operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG. Note that FIG. 3 shows the navigation device N.
The flow of processing in is shown. First, it is assumed that the user inputs a change instruction to another station from the input unit 169 while receiving the FM audio signal in the FM tuner 160 and listening to the audio output from the speaker 168. Then, based on the output signal from the channel selection unit 163, the reception frequency of the FM tuner 160 is changed as described above, and the changed frequency detection unit 166 changes the frequency and generates information about the changed frequency. . Then, the information regarding the change of the frequency and the frequency after the change is output to the navigation device N via the communication control unit 167.

In the navigation device N which received this (step 301), when the display (program information etc.) based on the FM multiplex data is already being displayed on the display portion 10a (step 302), the changed frequency. The determining unit 46 determines whether or not the broadcasting station of No. 1 matches the frequency of the broadcasting station currently displayed (step 303). If it is determined that they do not match, if the setting of the frequency interlocking control function by the frequency interlocking unit 47 is ON by the setting switching unit 48 (step 30
4), The received frequency change instruction to the changed frequency is output to the FM multiplex receiver 130 (step 30).
5).

Channel selection unit 13 in FM multiplex receiver 130
Since No. 3 selects a channel according to the change instruction, the reception frequency is changed as described above. Further, the multiplex data included in the changed FM broadcast wave is separated by the FM multiplex reception unit 134 and output to the navigation device N. The FM multiplex data input to the navigation device N (step 306) is processed by the multiplex data processing unit 49 into information suitable for display, and is displayed on the display unit 10a (step 307).

In step 302, when the display based on the FM multiplex data is not displayed on the display unit 10a, in step 303, when the changed broadcast song matches the already displayed broadcasting station, in step 304, When the setting of the frequency interlocking control function by the frequency interlocking unit 47 is OFF, there is no need to change the display, so the change processing is terminated.

[3. Effects of Embodiment] According to the present embodiment as described above, even in the case where the broadcasting station is changed in the FM tuner 160 which is listening to the sound in the general broadcast, the FM multiplexed data is displayed on the display unit of the navigation device. 10
Since the broadcasting station displayed in a can be automatically matched with this, there is no need to change the display. .

The display unit 10a of the navigation device
When the FM multiplex data is not displayed, the user inputs the setting change instruction from the input unit 11 to input the setting switching unit 4
When the frequency change control by the frequency interlocking unit 47 is OFF, the frequency change is not performed. Therefore, only when the FM multiplex data having contents close to the broadcast contents is being displayed, they are displayed in conjunction with each other. You can

Even if the on-vehicle audio system and the navigation device are respectively configured in separate housings or the like, the frequencies of the receivers can be interlocked with each other via the communication control unit 167. The degree of freedom of arrangement in is increased.

[4. Other Embodiments] The present invention is not limited to the above embodiments. For example, the configuration of the receiver that receives the FM broadcast is not limited to the configuration examples of the FM tuner and the FM multiplex receiver described in the above embodiments. Further, in the above-described embodiment, the part for performing the frequency change control is configured as a part of the navigation device, but as a circuit on the FM multiplex receiver side or separately from the navigation device or the FM multiplex receiver. May be configured as a circuit. Furthermore, the present invention can be applied to devices other than those mounted on vehicles.

[0042]

As described above, according to the present invention, by controlling the reception frequency of the FM tuner for general broadcast reception and the reception frequency of the FM multiplex receiver automatically in synchronization with the same frequency, it is possible to obtain the broadcast sound. F to save the trouble of matching the display screen
An M broadcast receiving system can be provided.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a system configuration example of an embodiment of the present invention.

FIG. 2 shows an FM tuner and an FM according to the embodiment of the present invention.
It is a functional block diagram which shows the structural example of a multiple receiver.

FIG. 3 is a flowchart showing a procedure of frequency changing processing according to the embodiment of the present invention.

[Explanation of symbols]

N ... Navigation device 1 ... Absolute position / direction detector 2… Relative direction detector 3 ... Vehicle speed detector 4 ... Main CPU and its peripheral circuits 9 ... User interface section 10b ... voice output section 10a ... Display section 11,169 ... Input unit 12 ... CD / DVD-ROM control unit 14 ... Optical / radio wave beacon reception and processing unit 15 ... Voice recognition unit 41 ... Destination setting section 42 ... Current position calculator 43 ... Route calculation unit 44 ... Guide 45 ... Drawing section 46 ... Judgment unit 47 ... Frequency interlocking unit 48 ... Setting switching section 49 ... Multiple data processing unit 130 ... FM multiplex receiver 131, 161 ... FM detection circuit 132, 162 ... PLL circuit 133, 163 ... Channel selection section 134 ... FM multiplex receiver 160 ... FM tuner 164 ... FM stereo demodulation circuit 166 ... Change frequency detection unit 167 ... Communication control unit 168 ... speaker

Claims (6)

[Claims] 1. A receiver for receiving an FM broadcast, a channel selection section for selecting a reception frequency, an FM multiplex data demodulation section for demodulating the received FM multiplex data, and a display section for displaying the demodulated FM multiplex data. In the FM broadcast receiving system having the above, the channel selection section is connected to a reception frequency control section for changing the reception frequency in response to input of frequency change information from another receiver. Characteristic FM broadcast receiving system. 2. An FM broadcast receiving system comprising a pair of receivers for respectively receiving FM broadcasts, wherein the pair of receivers each have a channel selecting section for selecting a reception frequency, and one receiver is a receiver. F for demodulating the FM multiplexed data
A case where an M multiplex data demodulation unit and a display unit for displaying demodulated FM multiplex data are provided, and the frequency change information in the other receiver's channel selection unit is input to the other channel selection unit. An FM broadcast receiving system, further comprising: a receiving frequency control unit connected to the receiving unit to change the receiving frequency of one of the receivers to match each other. 3. The reception frequency control section has a communication means for transmitting, to one of the receivers, information on the frequency change in the channel selection section of the other receiver. FM broadcast receiving system. 4. The frequency change information includes a changed frequency, and the reception frequency control unit matches the changed frequency with a reception frequency in a channel selection unit of the receiver to which the changed frequency is input. A determination unit that determines whether or not the frequency is determined, and a frequency interlocking unit that causes the reception frequency in the channel selection unit to match the changed frequency when the determination unit determines that the frequencies do not match. The FM broadcast receiving system according to any one of claims 1 to 3, characterized in that: 5. The FM broadcast receiving system according to any one of claims 1 to 4, further comprising a switching unit that switches whether to perform frequency change control by the reception frequency control unit. 6. A receiver having the FM multiplex data demodulation unit and the display unit is connected to a navigation device that displays and guides a route for a mobile body to reach a destination from a departure place. The FM broadcast receiving system according to claim 1, wherein the FM broadcast receiving system is provided.