JP2007215138A - Broadcast receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiving apparatus capable of receiving the same program easily even if a vehicle goes out of the former receiving area while moving, and when the receiving state is not improved even if a receiving station is changed, easily returning to the station received before. <P>SOLUTION: When a receiving level detecting part 10a detects a fall in the present receiving level, a broadcast station searching part 10b searches a station information storage part 8 for a receivable broadcast station based on the present location information obtained by a present location detection part 7, and searches for a broadcast station of the same affiliate with the immediately preceding station received. A reception switching part 10c switches a receiving frequency to a frequency of the broadcast station of the same affiliate with the immediately preceding station received. When the receiving level of the switched receiving frequency falls to a predetermined level or lower, the receiving frequency is returned to the immediately preceding frequency received. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus that receives broadcast radio waves in a mobile body, such as a car TV, a car radio, and the like, and in particular, can search for affiliated stations and continuously receive broadcasts as the vehicle moves. Related to a broadcast receiving apparatus that can return to the reception of the station that was received immediately before by a simple operation when the reception condition is unstable and the newly received affiliated station's radio wave reception condition is poor It is.

  In recent years, electronic devices have been reduced in size and price, and various electronic devices have been installed in automobiles. For example, various devices such as a broadcast receiving device such as a car radio or a car TV, an audio / video device such as an MD / DVD player, and a car navigation device are installed and used in many automobiles.

  For example, recently terrestrial digital broadcasting commercial broadcasting has started and is gradually spreading. However, terrestrial digital broadcasting employs a ghost-resistant transmission method called OFDM, and even in mobiles such as automobiles. A digital broadcast receiver is about to be used.

  For example, in the following Patent Document 1 (Japanese Patent Laid-Open No. 2004-320406), broadcast reception having a terrestrial digital automatic channel selection method for continuously selecting a digital broadcast for each area even when moving across the broadcast area. An apparatus is disclosed.

  The broadcast receiving apparatus disclosed in Patent Document 1 includes a diversity antenna receiver equipped with a double tuner, and performs reception using a signal having a better state with two tuners. When the radio wave is stable, channel search is performed using one tuner, and all channel information in the reception area is stored in the receiver. Also, by broadcasting the channel information of the adjacent area by broadcasting, receiving it with one tuner and storing the channel information of the adjacent area, searching for the broadcast channel of that area when moving to the adjacent area And seamless broadcast reception.

  However, in these broadcast receiving apparatuses, a phenomenon occurs in which the mobile object is destined to move out of the reception area of the currently receiving channel as it moves and cannot be received. At that time, a message indicating that reception is not possible is displayed on the screen, and the user is prompted to re-tune. In that case, it takes time for the channel selection operation, and the channel selection operation is difficult particularly when the user is driving.

  In order to solve such a problem, for example, the following Patent Document 2 (Japanese Patent Laid-Open No. 2001-285101) discloses a broadcast receiving apparatus that can easily receive the same program even if it is out of the current receiving area. Has been.

When the broadcast receiving apparatus disclosed in Patent Document 2 receives current position information and the like from the car navigation system, the digital broadcast receiver on the mobile unit receives the reception range information and the current position information stored in advance in the memory. And a search for a broadcast station within the receivable range in the memory and a search for the program that has been received immediately before.
JP 2004-320406 A JP 2001-285101 A

  By the way, in the broadcast receiving apparatus, the reception state of the radio waves of the stations in any area tends to become unstable at the boundary between the two broadcast areas. In particular, when traveling in a mountainous area, the radio wave state changes significantly due to the radio wave being blocked by the mountain. For this reason, even if the reception channel is switched as in the broadcast receiving apparatus disclosed in Patent Document 1, the reception state of the station that was received before the new station may be better than that of the new station. sell. In such a case, in the broadcast receiving device disclosed in the above-mentioned Patent Document 2, the previously received station continues to receive from a new station with a poor radio wave condition even though the radio wave condition is good. There was a problem of becoming.

  As a result of various studies to solve the above problems, the inventor of the present application has determined that the reception level detecting means for detecting that the reception level has decreased to a predetermined level or less and the reception frequency immediately before the broadcast receiving apparatus. And a reception switching means for returning to the received frequency, and when a reception level drop is detected, reception is possible at the current position based on the current position information obtained by the current position detection means, and reception was performed immediately before. Search for a broadcasting station of the same series as the broadcasting station, switch to the frequency of the broadcasting station, and when it is detected that the reception level of the switched reception frequency is below a predetermined level, the reception switching means The inventors have conceived that the above-mentioned problems can be solved if the frequency is restored, and the present invention has been completed.

  That is, the present invention has an object to solve the above-mentioned problems, and can easily receive the same program even if the vehicle is out of the previous reception area while the vehicle is moving. It is an object of the present invention to provide a broadcast receiving apparatus that can easily return to a previously receiving station when the condition is not improved.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
A broadcast receiver for receiving broadcast radio waves in a mobile body, corresponding to each broadcast station, station information storage means for storing broadcast reception range information, frequency information and broadcast station series information; and Current position detection means for detecting the current position, reception level detection means for detecting that the reception level has dropped below a predetermined level, and when the reception level detection means detects a decrease in the current reception level, the current position detection means Broadcast station search means for searching for a broadcast station of the same series as the broadcast station that has been received immediately before, based on the obtained current position information, at the current position from the station information storage means, and the broadcast station search means The reception level detecting means detects that the reception level of the switched reception frequency is equal to or lower than a predetermined frequency. When it is characterized in that the received frequency, and a reception switching means for returning the frequency which has been received immediately before.

  The invention according to claim 2 of the present application is the broadcast receiving apparatus according to claim 1, wherein the reception switching means displays a touch panel type instruction button when the reception level of the switched reception frequency becomes a predetermined level or less. When the instruction button is pressed, the reception frequency is returned to the frequency received immediately before.

  According to claim 3 of the present application, in the broadcast receiving apparatus according to claim 1 or claim 2, the frequency is a radio wave of terrestrial digital broadcasting, and a decrease in reception level is determined by an error rate of a received signal. It is characterized by doing.

  The broadcast receiving apparatus of the present invention has the following effects.

  That is, in the invention according to claim 1, when a current reception level decrease is detected, a broadcast station that can be received from the current position information is searched, and there is a broadcast station of the same series as the broadcast station that has been received immediately before. Switch to the frequency of the broadcasting station of the same series as the broadcasting station that was receiving until immediately before, but when the reception level of the switched reception frequency drops to a predetermined level, the reception frequency is received immediately before It was made to return to the frequency which was doing.

  As a result, the same program can be easily received even if the vehicle moves out of the previous reception area while moving, and when the reception state did not improve even after switching the reception station, it was received before You can easily return to the station.

  Further, in the invention according to claim 2, in the broadcast receiving apparatus according to claim 1, when the reception level of the switched reception frequency falls to a predetermined level, a touch panel type instruction button is displayed and the instruction button is pressed. In this case, since the reception frequency is returned to the frequency that was received immediately before, it is possible to select whether or not to return to the frequency that was received immediately before by the user's will.

  In the invention according to claim 3, in the broadcast receiving apparatus according to claim 1 or 2, it is applied to the radio wave of terrestrial digital broadcasting, and the decrease in the reception level is determined by the error rate of the received signal. This makes it easy to determine the reception level drop.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiment shown below exemplifies an embodiment for embodying the technical idea of the present invention, and is not intended to specify the present invention to this embodiment. It is equally applicable to other embodiments within the scope of the claims.

  FIG. 1 is a block diagram of the entire periphery of a broadcast receiving apparatus according to the present invention. Here, a case will be described where terrestrial digital television broadcasting is received by a mobile body such as an automobile. The terrestrial digital broadcast signal caught by the antenna 3 is received by the broadcast receiver 1, and the video is displayed on the monitor 5.

  On the other hand, the GPS signal received by the GPS antenna 4 is supplied to the car navigation system 2, and the current position information is displayed on the monitor 5. The broadcast receiver 1 and the car navigation system 2 are connected via an external interface.

  FIG. 2 is a block diagram showing the configuration of the broadcast receiving apparatus 1 of the present invention. As shown in FIG. 2, the broadcast receiving apparatus 1 includes a TV receiving unit 6, a current position detecting unit 7, a station information storage unit 8, an input unit 9, a control unit 10, a ROM 11, a RAM 12, a display unit 13, an audio output unit 14, and the like. It is configured with.

  The control unit 10 includes a reception level detection unit 10a, a broadcast station search unit 10b, and a reception switching unit 10c, and controls each unit of the broadcast receiving apparatus. The ROM 11 stores a control program used by the control unit 10, and the RAM 12 stores various data necessary for the control unit 10.

  The TV receiver 6 inputs the terrestrial digital television signal received by the antenna 3 to the controller 10. The display unit 13 processes the video signal generated from the terrestrial digital television signal by the control unit 10 and displays it on the monitor 5. The audio output unit 14 processes the audio signal generated from the terrestrial digital television signal by the control unit 10 and outputs it from a speaker (not shown).

  The station information storage unit 8 includes the names of all broadcast stations existing within the range in which the mobile body equipped with the broadcast receiving apparatus moves, the reception range information that can receive the broadcast, and the frequency information of the signals that they broadcast. Storing and managing broadcast station affiliate information. The current position detection unit 7 acquires position information from the car navigation system 2 and inputs the position information to the control unit 10. 9 displays a touch panel type button on the monitor 5 and receives an instruction input.

  The reception level detection unit 10a of the control unit 10 detects that the reception level has decreased below a predetermined level. When the reception level detection unit 10a detects a decrease in the current reception level, the broadcast station search unit 10b can receive at the current position from the station information storage unit 8 based on the current position information from the current position detection unit 7, and immediately before Search for a broadcasting station in the same series as the broadcasting station that received the message. The reception switching unit 10c switches to the frequency of the broadcast station searched by the broadcast station search unit 10b, and when the reception level detection unit 10a detects that the reception level of the switched reception frequency is below a predetermined level, Return the reception frequency to the frequency that was received immediately before.

  As described above, in this embodiment, the broadcast receiving apparatus 1 receives the reception level detection means (reception level detection unit 10a) for detecting that the reception level has decreased below a predetermined level and the reception frequency immediately before. And a reception switching means (reception switching section 10c) for returning to a predetermined frequency, and when a decrease in reception level is detected, based on the current position information obtained by the current position detection means (current position detection section 7), When it is detected that the reception level of the switched reception frequency is below a predetermined level after searching for a broadcast station of the same series as the broadcast station that has been received immediately before, switching to the frequency of that broadcast station The reception switching means can return to the frequency that was received immediately before.

  The operation procedure of the broadcast receiving apparatus 1 as described above will be described in detail based on the flowchart of FIG. FIG. 3 is a flowchart showing the channel selection operation of the broadcast receiving apparatus 1 according to the embodiment of the present invention.

  When the user switches on, the radio wave of the selected broadcast station is received (step S1). The reception level detection unit 10a detects a bit error in the received terrestrial digital television signal, calculates an error rate, and determines whether or not the error has become a predetermined value or more (step S2). If the error rate is not greater than or equal to the predetermined value, the process of step S2 is repeated.

  If the error rate becomes greater than or equal to the predetermined value in the determination process of step S2, it is determined that the reception state has deteriorated because it has deviated from the reception area of the terrestrial digital television signal that has been received so far. (Step S3). Subsequently, information on the current position is acquired from the car navigation system 2 through the current position detection unit 7 (step S4), and the station information storage unit 8 is searched by the broadcast station search unit 10b to correspond to the current position. Is read (step S5).

  It is determined whether or not there is a station of the same series as the broadcast station that has been received so far (step S6). If there is a station of the same series, the reception switching unit 10c sets the reception frequency. Switching is performed to receive the frequencies of the stations of the same series (step S7).

  Next, the error rate of the terrestrial digital television signal being switched and received is calculated, and it is determined whether or not the error rate has exceeded a predetermined value (step S8). There is a possibility that the reception state of the radio wave of the station that was receiving is better. Therefore, as shown in FIG. 4, the input unit 9 displays a touch panel type instruction button displaying “return to the previous receiving station” on the monitor 5 (step S9), and whether or not the instruction button has been pressed. (Step S10), and when it is depressed, it is switched to the frequency received immediately before, that is, the frequency stored in step S3 (step S11).

  On the other hand, if there is no station of the same series in the determination process in step S6, a touch panel type channel selection button for stations that can be received in the reception area is displayed on the monitor 5 (step S12), and the channel selection button is pressed. It is determined whether or not (step S13). When any channel selection button is pressed, the frequency corresponding to the channel selection button is received (step S14).

  As described above, when the reception level lowering is detected by such processing, it can be received at the current position on the basis of the current position information obtained by the current position detecting means (current position detecting unit 7). Search for a broadcast station of the same series as the broadcast station that had received up to and switch to the frequency of the broadcast station, and when it is detected that the reception level of the switched reception frequency is below a predetermined level, the reception switching means It becomes possible to return to the frequency received immediately before.

  In the above embodiment, the case of terrestrial digital television has been described. However, the present invention is not limited thereto, and can also be applied to terrestrial digital radio, analog television, and analog radio.

It is a block diagram which shows the whole structure containing the broadcast receiver of this invention, and a peripheral device. It is a block diagram which shows the structure of the broadcast receiver of this invention. It is a flowchart which shows the channel selection operation | movement of the broadcast receiver of this invention. It is a figure which shows an example of the display screen which displayed the touchscreen type | mold instruction | indication button for instruct | indicating returning to the frequency received immediately before.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Broadcast receiving apparatus 2 ... Car navigation system 3 ... Antenna 4 ... GPS antenna 5 ... Monitor 6 ... TV receiving part 7 ... Current position detection part 8 ... Station information storage part 9 ... Input part 10 ... Control part 11 ... ROM
12 ... RAM
13 ... Display unit 14 ... Audio output unit

Claims (3)

  A broadcast receiver for receiving broadcast radio waves in a mobile body, corresponding to each broadcast station, station information storage means for storing broadcast reception range information, frequency information and broadcast station series information; and Current position detection means for detecting the current position, reception level detection means for detecting that the reception level has dropped below a predetermined level, and when the reception level detection means detects a decrease in the current reception level, the current position detection means Broadcast station search means for searching for a broadcast station of the same series as the broadcast station that has been received immediately before, based on the obtained current position information, at the current position from the station information storage means, and the broadcast station search means The reception level detecting means detects that the reception level of the switched reception frequency is equal to or lower than a predetermined frequency. The time, the broadcast receiving apparatus, characterized in that the received frequency, and a reception switching means for returning the frequency which has been received immediately before.   The reception switching means displays a touch panel type instruction button when the reception level of the switched reception frequency becomes a predetermined level or less, and when the instruction button is pressed, the reception frequency is set to the frequency received immediately before. The broadcast receiving apparatus according to claim 1, wherein the broadcast receiving apparatus is returned. The broadcast receiving apparatus according to claim 1, wherein the frequency is a radio wave of terrestrial digital broadcasting, and a decrease in reception level is determined by an error rate of a received signal.

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