JP2007123969A - Radio receiver and radio receiver control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To grasp the switching between digital broadcasting and analog one intuitively when a reception state is deteriorated in the digital broadcasting and hence a user is provided with a program by the analog broadcasting instead of the digital one by applying to, for example, an on-vehicle radio receiver for receiving terrestrial digital broadcasting. <P>SOLUTION: The reception state is deteriorated in the digital broadcasting, and hence the program is provided by the analog broadcasting instead of the digital one, thus changing the display color of a display section in linking with the switching. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio receiver and a radio receiver control method, and can be applied to an in-vehicle radio receiver that receives digital terrestrial broadcasting by DAB (Digital Audio Broadcasting), for example. The present invention provides a digital broadcast by switching the display color of the display unit in conjunction with the switching so as to provide a program for an analog broadcast instead of a program for a digital broadcast due to deterioration of the reception state by the digital broadcast. And make it possible to intuitively understand the switch between analog broadcasting.

  Conventionally, in-vehicle radio receivers for Europe have been provided for receiving AM broadcasting, FM broadcasting, and DAB (Digital Audio Broadcasting) (hereinafter, these types are referred to as bands).

  Here, DAB is a terrestrial digital broadcasting system and is practically used in accordance with the Eureka 147 standard. DAB broadcasts audio data compressed by orthogonal frequency division multiplex modulation using a transmission band of 1.5 [MHz], and one broadcast wave in the transmission band of 1.5 [MHz] is an ensemble. Called. This ensemble is divided into groups called services. In DAB, programs of general broadcasting stations are provided by each service.

  As a result, in the conventional in-vehicle radio receiver, the band, the reception frequency, and the like are switched according to the operation by the user, and the currently received band, the reception frequency, and the like are displayed in characters.

  In addition to programs provided only by DAB, programs provided by DAB include programs provided by analog broadcasting such as FM broadcasting. Thereby, in DAB, it is possible to listen to a program provided by such an analog broadcast with higher sound quality than when receiving a program by analog broadcast. However, DAB has a drawback that the range in which service can be provided by one transmission facility is narrow compared to analog broadcasting, and the installation of transmission facility is still insufficient.

  As a result, the conventional in-vehicle radio receiver provides the DAB with priority to the user for the program simultaneously provided by DAB and analog broadcasting, and the DAB receives the DAB when the reception state of the DAB deteriorates. Instead, it offered analog broadcast programs to users.

 Regarding such an in-vehicle radio receiver, for example, in Japanese Patent Laid-Open No. 10-224244, a user is instructed to receive a program by analog broadcasting, and the program instructed by the user is also provided by DAB at the same time. A method of providing a DAB program instead of an analog broadcast program has been proposed.

  By the way, when the DAB reception state is deteriorated and the analog broadcast is provided to the user instead of the DAB, if the DAB reception state changes from moment to moment as the vehicle travels, the in-vehicle radio receiver Thus, the program is received by appropriately switching the band. In such a case, when a program by DAB is received, various services such as an electronic program guide by DAB can be used, but when a program by analog broadcasting is received, Such various services cannot be used.

As a result, it is desirable that the user can intuitively grasp such band switching, but such band switching is often not understood only by listening to the program, and moreover, during the conventional reception. Depending on the character display associated with the band, there is a problem that cannot be intuitively grasped.
JP-A-10-224244

  The present invention has been made in consideration of the above points. When a program based on an analog broadcast instead of a digital broadcast is provided to a user due to deterioration in the reception state of the digital broadcast, the digital broadcast and the analog broadcast are switched. The present invention intends to propose a radio receiver that can be intuitively grasped and a control method of the radio receiver.

  In order to solve this problem, the invention of claim 1 is applied to a radio receiver to receive a digital broadcast program and output a digital broadcast audio signal, and to receive an analog broadcast program. An analog broadcast tuner unit that outputs an analog broadcast audio signal, a selection unit that selectively outputs the digital broadcast audio signal and the analog broadcast audio signal, and at least information related to the audio signal that is selectively output by the selection unit And a control unit that controls the operation of each unit. The control unit replaces the audio signal by the digital broadcast due to the deterioration of the reception state in the tuner unit of the digital broadcast. Controls switching of the setting of the selection unit so as to selectively output audio signals by broadcasting Rutotomoni, switch the color of display by the display unit.

  According to a third aspect of the present invention, there is provided a digital broadcast tuner for receiving a digital broadcast program and outputting a digital broadcast audio signal, and an analog broadcast for receiving an analog broadcast program and outputting an analog broadcast audio signal. Control of a radio receiver having a tuner unit, a selection unit that selectively outputs an audio signal by digital broadcasting and an audio signal by analog broadcasting, and a display unit that displays information related to the audio signal that is selected and output by at least the selection unit Applying to the method, the setting of the selection unit is switched so as to selectively output the audio signal based on the analog broadcast instead of the audio signal based on the digital broadcast due to the deterioration of the reception state in the tuner unit of the digital broadcast. The color of display by the display unit is switched.

  According to the configuration of the first aspect, applied to a radio receiver, a digital broadcast tuner unit that receives a digital broadcast program and outputs a digital broadcast sound signal, and receives an analog broadcast program and receives an analog broadcast sound. A tuner for analog broadcasting that outputs a signal; a selection unit that selectively outputs an audio signal by digital broadcasting and an audio signal by analog broadcasting; and a display unit that displays at least information related to the audio signal that is selectively output by the selection unit; A control unit that controls the operation of each unit, and the control unit selects the audio signal based on the analog broadcast instead of the audio signal based on the digital broadcast due to deterioration of the reception state in the tuner unit of the digital broadcast In order to output, the setting of the selection unit is switched and controlled, and the display Be switched color display by, without watching the every time display unit, it is possible to confirm the switching of the band, it is possible to intuitively grasp the switching between digital broadcasting and analog broadcasting.

  Thus, according to the third aspect of the present invention, the switching between the digital broadcast and the analog broadcast is intuitively grasped when the analog broadcast instead of the digital broadcast is provided to the user due to the deterioration of the reception state of the digital broadcast. It is possible to provide a radio receiver control method that can be performed.

  According to the present invention, switching between digital broadcasting and analog broadcasting can be intuitively grasped when a program based on analog broadcasting is provided to a user instead of digital broadcasting due to deterioration in the reception state of digital broadcasting.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

(1) Configuration of Embodiment FIG. 2 is a block diagram showing an in-vehicle radio receiver according to an embodiment of the present invention. In this in-vehicle radio receiver 1, the DAB tuner unit 2 selects a broadcast wave of an ensemble related to a service desired by the user from a large number of broadcast waves received by the antenna 4 under the control of a microcomputer 3. To convert to an intermediate frequency signal. The intermediate frequency signal is subjected to analog-digital conversion processing, quadrature demodulation processing, fast Fourier transform processing, and error correction processing, and then audio data relating to a service desired by the user is selected and decompressed to output an audio signal S1. In addition, data relating to various services such as an electronic program guide, bit rate data of each service, and the like are acquired and notified to the microcomputer 3.

  In these processes, when it becomes difficult to correct a bit error in the error correction process, the DAB tuner unit 2 mutes and outputs the audio signal S1. The error rate of the received ensemble is detected and notified to the microcomputer 3. As a result, the DAB tuner unit 2 receives and outputs a DAB program, and notifies the microcomputer 3 of the reception state related to this program.

  Under the control of the microcomputer 3, the FM tuner unit 5 selects a broadcast wave related to a program desired by the user from a large number of broadcast waves received by the antenna 6, and converts it into an intermediate frequency signal. Further, this intermediate frequency signal is detected, and an audio signal S2 based on the detection result is output. In these processes, the FM tuner unit 5 generates an electric field intensity detection signal S3 whose signal level changes according to the electric field intensity of the received broadcast wave when detecting the intermediate frequency signal, and this electric field intensity detection signal S3 is generated by the microcomputer. 3 is notified. As a result, the FM tuner unit 5 receives and outputs a program based on analog broadcasting, detects a reception state related to the program, and notifies the microcomputer 3 of the reception state.

  The selection circuit 7 selectively outputs the audio signals S1 and S2 output from the DAB tuner unit 2 and the FM tuner unit 5 under the control of the microcomputer 3. In the in-vehicle radio receiver 1, the audio signal S1 or S2 output from the selection circuit 7 is input to an audio signal processing system (not shown), and the volume and sound quality are adjusted by the audio signal processing system to drive a speaker. . Thereby, the in-vehicle radio receiver 1 receives a program by DAB or a program by FM broadcasting and provides the program to the user. The in-vehicle radio receiver 1 is provided with a configuration for reproducing a compact disc or the like in addition to the configuration related to DAB and FM broadcasting.

  The display driver 8 drives the display 9 under the control of the microcomputer 3, and the display 9 is formed of, for example, a liquid crystal display device, and displays information related to an audio signal that is selectively output from the selection circuit 7 by being driven by the display driver 8. . That is, as shown in FIG. 3, the display 9 is formed in a horizontally long shape, and when a DAB program is provided to the user, as a general example, as shown in FIG. , The band “DAB” being received and the ensemble label “BBC DIGITAL ONE” of the ensemble being received are displayed. Further, the service label “BBC 7” of the service related to the program is displayed in the second row, and the information of the ensemble and the frequency “5A 174.928 MHz” related to the program are displayed in the subsequent third row.

  On the other hand, when a program by FM broadcasting is provided to the user, as shown in FIG. 3B, it is shown that the currently selected band “FM” is selected at the top, and the program is selected manually. The display “MANUAL” is displayed, and the reception frequency “108.00 MHz” is displayed in the second stage. Note that the display 9 displays a bit rate, an error rate, a clock, and the like at the lowest level shown in FIGS. 3A and 3B in response to a user operation.

  Accordingly, the display 9 displays the band, reception frequency, etc. of the program currently provided to the user by character display, and in this embodiment, the color of this character display is switched between DAB and analog broadcasting.

  That is, the display 9 is configured to supply illumination light to the liquid crystal display panel by a backlight, and two types of primary light sources having different emission colors are applied to the primary light source of the backlight. Thus, the display 9 is configured so that the display colors can be switched by selectively lighting the two types of primary light sources.

  In this embodiment, the display 9 applies the amber and green primary light sources to these two types of primary light sources, and if the FM broadcast program is provided to the user, the amber primary light source is selected. On the other hand, when a DAB program is provided to the user, the green primary light source is selectively lit.

  Further, the display 9 displays the band, reception frequency, etc. of the program currently provided to the user by so-called black-and-white inversion display, and thereby provides the user with a program by FM broadcasting. A band, reception frequency, etc. are displayed in black on amber background. On the other hand, when a DAB program is provided to the user, a band, a reception frequency, etc. are displayed in black on a green background. Thus, in this embodiment, the band being received can be intuitively grasped without visually checking the displayed characters one by one.

  The microcomputer 3 is arithmetic processing means for controlling the operation of the in-vehicle radio receiver 1 by executing a processing program recorded in a memory (not shown). Although the program related to the processing of the microcomputer 3 is provided by being installed in advance by recording in a memory, it is provided by downloading via a network such as the Internet instead of providing by such advance installation. It may also be provided by a recording medium such as an optical disk, a magnetic disk, or a memory card.

  Here, when the reception of the FM broadcast is instructed by the operation of the operator (not shown) by the user, the microcomputer 3 receives the program by the FM tuner unit 5 in response to the operation by the user. In addition, the selection circuit 7 is controlled so as to select the audio signal S2 output from the FM tuner unit 5, thereby providing the user with a program broadcast by FM broadcasting. Further, under the control of the display driver 8, the display 9 is set to display for FM broadcasting.

  On the other hand, when DAB reception is instructed by the user, a DAB program is received under the control of the DAB tuner unit 2. In addition, the selection circuit 7 is controlled so as to select the audio signal S1 output from the DAB tuner unit 2, thereby providing the user with a program provided by DAB. The display 9 is set to display for FM broadcasting under the control of the display driver 8.

  When the microcomputer 3 receives the DAB in this way, the microcomputer 3 searches whether the program provided to the user by the DAB is simultaneously provided by the FM broadcast based on the data notified from the DAB tuner unit 2. If there is a program provided simultaneously by this search, the operation of the FM tuner unit 5 is activated, and the FM tuner unit 5 receives the program provided simultaneously. The microcomputer 3 receives the program simultaneously provided by DAB and FM broadcasting in this way by the DAB tuner unit 2 and the FM tuner unit 5 and executes the processing procedure of FIG. As a result of the deterioration, the FM broadcast program is provided to the user instead of the DAB.

That is, when the microcomputer 3 starts this processing procedure, the microcomputer 3 moves from step SP1 to step SP2, acquires the error rate and electric field strength detection signal S3 from the DAB tuner unit 2 and the FM tuner unit 5, respectively, and obtains the error rate and electric field strength. The detection signal S3 is determined. Here, when the error rate has deteriorated to, for example, 1.0 × 10 ⁻⁴ or less, the microcomputer 3 determines that the reception state by DAB has deteriorated. Similarly, the signal level of the electric field strength detection signal S3 is determined, and the reception state of the FM broadcast is determined.

  In subsequent step SP3, the microcomputer 3 determines which program of the program received by the DAB tuner unit 2 and the program received by the FM tuner unit 5 to be provided to the user based on the determination result of step SP2. Here, the microcomputer 3 provides the user with a program received by the DAB tuner unit 2 when the DAB reception state has not deteriorated or when the reception state has deteriorated in both DAB and FM broadcasting. The process proceeds from step SP3 to step SP4.

  Here, the microcomputer 3 controls the operation of the selection circuit 7 so as to selectively output the audio signal S1 output from the DAB tuner unit 2. Further, the operation of the display driver 8 is controlled so that the display 9 becomes a DAB display, and the process returns to step SP2.

  On the other hand, if the deterioration of the reception state is detected by DAB and the reception state by FM broadcasting is not deteriorated, the microcomputer 3 moves from step SP3 to step SP5 and outputs the audio signal S2 output from the FM tuner unit 5. Is controlled to control the operation of the selection circuit 7. Further, the operation of the display driver 8 is controlled so that the display on the display 9 becomes an FM broadcast display, and the process returns to step SP2.

(2) Operation of the embodiment In the above configuration, when the in-vehicle radio receiver 1 provides an FM broadcast program to the user, the broadcast wave related to the desired program is selected from the broadcast wave received by the antenna 6. The intermediate frequency signal is converted into an intermediate frequency signal, and an FM broadcast audio signal S2 is acquired by detecting the intermediate frequency signal. The audio signal S2 is output to the audio signal processing system via the selection circuit 7 to drive the speaker. . As a result, the in-vehicle radio receiver 1 can watch a program by FM broadcasting.

  On the other hand, when a DAB program is provided to a user, a broadcast wave related to a desired program is selected from a broadcast wave received by the antenna 4 and converted into an intermediate frequency signal, and DAB is processed by processing the intermediate frequency signal. Is obtained, and the sound signal S1 is output to the sound signal processing system via the selection circuit 7 to drive the speaker. As a result, the in-vehicle radio receiver 1 can enjoy a DAB program.

  Further, when the in-vehicle radio receiver 1 provides the DAB program to the user in this way, the deterioration of the reception state by DAB is monitored by the error rate detected by the DAB tuner unit 2. At the same time, the reception state of the program provided by FM broadcasting is detected by monitoring the electric field strength in the FM tuner unit 5. In the in-vehicle radio receiver 1, when the DAB reception state deteriorates and the FM broadcast reception state is good, the setting of the selection circuit 7 is switched, and the FM broadcast program is replaced with the DAB program. Provided to users. As a result, the in-vehicle radio receiver 1 can continue to watch a desired program even when the vehicle is running and the reception state of DAB changes from moment to moment.

  However, due to the deterioration of the reception state by DAB in this way, when providing a program by FM broadcasting instead of the program by DAB to the user, the user is using the DAB even though the program by FM broadcasting is provided. It also occurs when the radio receiver 1 is operated in order to use the service. In this case, when the information related to the audio signal selected and output from the selection circuit 7 is simply displayed on the display 9, such a situation cannot be grasped unless the display 9 is watched. .

  For this reason, in the radio receiver 1, the display color of the display 9 is switched between when the DAB service is provided and when the FM broadcast program is provided to the user. Thus, the user can check the band currently being received by looking at the display 9 without gazing at the display 9 one by one. As a result, the radio receiver 1 intuitively grasps the switching between the digital broadcast and the analog broadcast when providing the user with a program based on the analog broadcast instead of the digital broadcast due to the deterioration of the reception state of the digital broadcast. Can do.

  In the radio receiver 1, such display color switching is executed by switching the backlight of the display 9 by the liquid crystal display device, whereby the display color can be switched easily and reliably.

(3) Advantages of the embodiment According to the above configuration, the display unit is provided in conjunction with switching between the analog broadcasting instead of the digital broadcasting program due to the deterioration of the reception state by the digital broadcasting. By switching the display color, it is possible to intuitively grasp the switching between digital broadcasting and analog broadcasting.

  Further, the display color can be easily and surely switched by switching the display color by switching the backlight.

  In the above-described embodiment, the case where the display color is switched by switching the background color has been described. However, the present invention is not limited to this, and the character display color itself may be switched. Further, the display color may be switched only for a part of the display unit.

  In the above-described embodiments, the case where the display color is switched by switching the backlight has been described. However, the present invention is not limited to this, and the liquid crystal display panel for color display is applied to drive the liquid crystal display panel. The display color may be switched by switching.

  Further, in the above-described embodiments, the case where the display unit is configured by the liquid crystal display device has been described. However, the present invention is not limited to this, and various display means such as EL, FED, and fluorescent display tube can be widely applied. Can do.

  In the above-described embodiments, the case where the band is switched between DAB and FM broadcast has been described. However, the present invention is not limited to this, and can be widely applied to the case where the band is switched between digital broadcast and analog broadcast.

  The present invention can be applied to an in-vehicle radio receiver that receives digital terrestrial broadcasting by DAB, for example.

It is a flowchart which shows the process sequence of the microcomputer of the radio receiver which concerns on the Example of this invention. It is a block diagram which shows the radio receiver which concerns on the Example of this invention. It is a top view which shows the display of the radio receiver of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Radio receiver, 2 ... DAB tuner part, 3 ... Microcomputer, 5 ... FM tuner part, 7 ... Selection circuit, 8 ... Display driver, 9 ... Display

Claims (3)

A digital broadcast tuner for receiving a digital broadcast program and outputting a digital broadcast audio signal;
An analog broadcast tuner that receives analog broadcast programs and outputs analog broadcast audio signals;
A selection unit that selectively outputs an audio signal from the digital broadcast and an audio signal from the analog broadcast;
A display unit that displays at least information related to the audio signal selected and output by the selection unit;
A control unit that controls the operation of each unit;
The controller is
Due to the deterioration of the reception state in the tuner part of the digital broadcast,
In place of the audio signal by the digital broadcast, the setting of the selection unit is switched and controlled so as to selectively output the audio signal by the analog broadcast,
A radio receiver characterized in that the color of display by the display unit is switched. The display unit
A liquid crystal display panel;
A backlight for supplying illumination light to the liquid crystal display panel;
The radio receiver according to claim 1, wherein the display color is switched by switching a color of the illumination light by the backlight. A digital broadcast tuner for receiving a digital broadcast program and outputting a digital broadcast audio signal;
An analog broadcast tuner that receives analog broadcast programs and outputs analog broadcast audio signals;
A selection unit that selectively outputs an audio signal from the digital broadcast and an audio signal from the analog broadcast;
A control method of a radio receiver having at least a display unit that displays information related to an audio signal that is selectively output by the selection unit,
Due to the deterioration of the reception state in the tuner part of the digital broadcast,
In place of the audio signal by the digital broadcast, the setting of the selection unit is switched so as to selectively output the audio signal by the analog broadcast,
A radio receiver control method, comprising: switching a display color by the display unit.

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