WO2010084536A1 - ラジオ受信装置 - Google Patents
ラジオ受信装置 Download PDFInfo
- Publication number
- WO2010084536A1 WO2010084536A1 PCT/JP2009/005153 JP2009005153W WO2010084536A1 WO 2010084536 A1 WO2010084536 A1 WO 2010084536A1 JP 2009005153 W JP2009005153 W JP 2009005153W WO 2010084536 A1 WO2010084536 A1 WO 2010084536A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- broadcasting
- stations
- reception
- radio
- broadcast
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/08—Constructional details, e.g. cabinet
- H04B1/082—Constructional details, e.g. cabinet to be used in vehicles
Definitions
- the present invention relates to a radio receiving apparatus that uses a frequency of an existing analog broadcast and receives a terrestrial digital radio broadcast that transmits a digital signal simultaneously with the analog broadcast, and is particularly suitable for use in a vehicle.
- the in-vehicle radio receiver one of the radio receivers, is the most receiving state among multiple antennas in order to alleviate the influence of fading that occurs as the vehicle moves and to ensure analog broadcast reception performance. Diversity reception for selecting a good antenna is widely used.
- Multipath interference is a major cause of noise and distortion of received voice.
- Multipath is generated when a plurality of signals that propagate through different paths from a transmitter of a broadcasting station and reach a receiving antenna interfere with each other. For example, a direct wave that reaches from the transmitting antenna and some reflected waves overlap, and the signal strength of the received signal is extremely lowered due to a phase difference or the like. Due to the difference in path length of each received wave, a multipath interference wave with a small time delay arrives when the difference in path length is short, and a multipath interference wave with a large time delay arrives when the difference in path length is long.
- the degree of multipath interference varies with geographical conditions and building differences.
- broadcast waves propagate along the road, and reflected waves with a small time delay are generated by the reflection of high-rise buildings. Many small received signals are mixed. Since the vehicle moves in such a fluctuating radio wave environment, the electric field strength is likely to fluctuate frequently in a short time. Therefore, antenna switching for selecting the antenna in the best reception state is likely to occur frequently.
- the hybrid radio receiving apparatus capable of receiving the above-described IBOC hybrid broadcast performs antenna switching during digital broadcast reception, the digital demodulation "out of synchronization" may occur due to the phase difference of the switched antenna.
- “out of synchronization” due to antenna switching tends to occur frequently in urban areas.
- diversity reception is controlled to be disabled when it is determined that an IBOC broadcast wave exists based on the demodulation result.
- An IBOC broadcast receiver is known (for example, see Patent Document 1).
- the IBOC broadcast receiver controls the diversity reception to be enabled when the existing analog broadcast is received, and disables the diversity reception when the IBOC broadcast is received.
- Optimum reception environments can be obtained at the time of both analog broadcast reception and IBOC broadcast reception.
- the diversity reception switching described above is based on the demodulation result and does not reflect the number of receivable broadcasting stations. For example, the influence of multipath when traveling in urban areas is not taken into account, and changes in real time. It cannot be adapted to the receiving environment.
- the diversity reception switching described above is automatically performed, the user's intention is not reflected and there is a problem in terms of convenience.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hybrid radio receiving apparatus that enables highly flexible diversity reception control and is excellent in convenience.
- a hybrid radio receiver of the present invention is a hybrid radio receiver that receives digital terrestrial broadcasts that transmit digital signals simultaneously with analog broadcasts, using the frequency of existing analog broadcasts.
- Diversity receiving unit that has a plurality of antennas and receives digital terrestrial radio broadcasting by switching antennas, and the diversity reception is invalidated when the number of receivable broadcasting stations acquired by channel selection operation is a predetermined number or more And a control unit.
- FIG. 1 is a block diagram showing a configuration of a hybrid radio receiving apparatus (hereinafter referred to as HD radio receiving apparatus) according to Embodiment 1 of the present invention.
- the HD radio receiver according to Embodiment 1 of the present invention includes antennas 11a and 11b, a diversity receiver 12, a front end 13, an FM detector 14, and a multiplexer (MPX).
- MPX multiplexer
- Demodulation circuit 15 PLL (Phase Locked Loop) circuit 16
- reception quality detection unit 17 IBOC decoding unit
- blending unit 19 DA converter
- DAC digital converter
- the HD radio broadcast wave received by the antenna 11a is selected by the front end 13 through the diversity receiver 12 and converted to an intermediate frequency (IF).
- the frequency signal converted into IF by the front end 13 is AD converted by an AD (Analog / Digital) converter (not shown) and supplied to the FM detection unit 14 and the IBOC decoding unit 18.
- the front end 13 is controlled by a PLL circuit 16 including a programmable frequency divider, and is configured to perform a channel selection operation by the control unit 21 setting a frequency division ratio.
- the detection output of the FM detection unit 14 is supplied to the MPX demodulation circuit 15 and is separated into L (left) and R (right) channel signals in the case of stereo broadcasting.
- the IBOC decoding unit 18 demodulates the IBOC method.
- the inside is composed of well-known functional blocks such as an OFDM (Orthogonal Frequency Division Multiplexing) demodulation 18a, a digital encoding 18b, an audio decoder 18c that performs demodulation and decoding such as audio compression, and the like of the received signal. .
- the audio data decoded and generated here is input to the blend unit 19.
- the blend unit 19 blends the analog broadcast wave reception sound (hereinafter referred to as analog reception sound) of the MPX demodulation circuit 15 and the digital broadcast wave reception sound (hereinafter referred to as digital reception sound) of the IBOC decoding unit 18. Output to the DAC 20.
- the control unit 21 is configured by, for example, a microcomputer with a built-in memory, and represents the degree of deterioration of the audio signal output from the reception quality detection unit 17 by the microcomputer sequentially reading and executing a program recorded in the memory. Based on the signal-to-noise ratio (S / N), the received electric field strength (RSSI: Received Signal Strength) indication, and the processing result of the OFDM demodulation 18a output from the IBOC decoding unit 18, a blend unit is possible if OFDM demodulation is possible. The digital reception voice is output from 19, and if the OFDM demodulation is impossible, the blending unit 19 is controlled so that the analog reception voice is output from the blending unit 19.
- S / N signal-to-noise ratio
- RSSI Received Signal Strength
- the control unit 21 also performs channel selection operation while changing the frequency by controlling the PLL circuit 16 when the power is turned on or the user operates the SEEK button assigned to the operation unit (not shown), and the receivable broadcast Information such as the frequency selected as the station and the broadcasting station name is stored in the receiving station memory 22. Further, when the number of receivable broadcasting stations acquired by the above-described channel selection operation is equal to or greater than a predetermined number, the control unit 21 controls the diversity receiving unit 12 to suppress the frequency of antenna switching. Details will be described later with reference to the flowchart shown in FIG.
- FIG. 2 is a flowchart showing the operation of the HD radio receiving apparatus according to Embodiment 1 of the present invention. Specifically, the processing procedure of the control unit 21 shown in FIG. 1 is shown.
- the operation of the HD radio receiving apparatus according to the first embodiment of the present invention shown in FIG. 1 will be described in detail with reference to the flowchart of FIG.
- the control unit 21 When the user turns on the power or operates the SEEK switch, the control unit 21 performs a channel selection operation while changing the frequency division ratio of the PLL circuit 16 (step ST201), and the frequency of the receivable broadcasting station. Is stored in the receiving station memory 22 (step ST202).
- whether or not the broadcast station is receivable is determined by the control unit 21 if the received electric field intensity output from the reception quality detection unit 17 is, for example, about ⁇ 90 to ⁇ 110 dBm or more at an FM broadcast station. It is determined that reception is possible.
- the control unit 21 counts the number of receivable broadcast stations stored in the reception station memory 22, and determines whether there are more than a predetermined number of receivable broadcast stations (step ST203). If it is determined that there are more than a predetermined number of receivable broadcasting stations (step ST203 “YES”), the control unit 21 controls the diversity reception unit 12 to invalidate diversity reception (step ST204). If the number is not more than the number (step ST203 “NO”), the diversity reception unit 12 is controlled to enable diversity reception (step ST205).
- disabling diversity reception means that one of the antennas 11a or 11b that receives the digital broadcast is OFF-controlled, and the other antenna 11b or 11a fixes the broadcast reception.
- a predetermined number N of receivable broadcast stations which is a determination criterion when suppressing diversity reception control, is selected from, for example, 4 to 40 broadcast stations, it is possible to determine whether the area is an urban area or not. . Further, for example, it is possible to count and define the number of broadcast stations that can be received while traveling in an urban area or an area away from the urban area in advance.
- a navigation system including a map DB (Data Base) as a storage unit and a GPS (Global Positioning System) as a position detection unit, and HD radio reception in conjunction with a PND (Personal Navigation Device)
- the device receives the current position of the vehicle from the navigation system or the PND, refers to the map DB in which the facility information including the broadcasting station is stored, and is located within a predetermined distance centered on the own vehicle position specified by the GPS. It is also possible to search for a broadcasting station to be counted and count it as the number of receivable broadcasting stations.
- FIG. 3 is a diagram illustrating an example of the data structure of the receiving station memory 22.
- a state where receivable broadcast stations are stored is shown, and memory numbers 1 to 11 are stored in association with receivable frequencies (Frequency).
- the call sign (Call Sign) is stored in association with a frequency and a broadcasting station from a station list held in advance.
- a band indicates a frequency band.
- the predetermined number N of broadcasting stations in the urban area is selected from 4 to 40 stations as described above.
- the setting of the predetermined number N may be fixed in the HD radio broadcast receiving apparatus, or may be automatically obtained and set from position information of the navigation system or the PND system.
- the control unit 21 receives diversity reception when the number of receivable broadcast stations acquired by the channel selection operation is greater than or equal to a predetermined number.
- the receivable broadcast station is within a predetermined distance from a broadcast station having a reception electric field strength output by the reception quality detection unit 17 of a predetermined value or more, or a vehicle position acquired from a navigation system or the like.
- a broadcasting station in the area is relatively large, for example, diversity reception is disabled in an urban area.
- the frequency of antenna switching may be reduced without fixing the receiving antenna.
- FIG. FIG. 4 is a block diagram showing a configuration of a hybrid radio receiving apparatus (HD radio receiving apparatus) according to Embodiment 2 of the present invention.
- the HD radio receiving apparatus according to the first embodiment shown in FIG. 1 has antennas 11a and 11b, a diversity receiving unit 12, In addition to the front end 13, FM detection unit 14, MPX demodulation circuit 15, PLL circuit 16, reception quality detection unit 17, IBOC decoding unit 18, blend unit 19, DAC 20, control unit 21, reception station memory 22, operation input unit The number of stations setting switch 23 is added.
- the station number setting switch 23 is, for example, a toggle switch or a rotary switch in which the numerical value increases each time the right end is pressed and decreases every time the left end is pressed. It shall be configured so that the numerical value decreases.
- the station number setting switch is operated to select and set a predetermined number of urban areas or other areas from 4 to 40 broadcasting stations. A good reception state can be obtained by setting a predetermined number according to the number of broadcasting stations in the area where the user resides.
- the user's intention is reflected by performing the user setting, so that convenience can be provided to the user.
- the number of receivable broadcasting stations is affected by daytime and nighttime radio wave conditions, weather, and the like, it is possible to obtain an effect of selecting a predetermined number N that is more suitable for the currently receiving area.
- the control unit 21 displays FIG.
- the predetermined number N defined according to the number of stations is indexed and the set number N is compared with the number of receivable broadcasting stations stored in the receiving station memory 22. Then, ON / OFF of antenna switching by the diversity receiver 12 is controlled.
- more than 40 broadcasting stations are concentrated in metropolitan areas such as Chicago and Detroit, and several stations are transmitting in other metropolitan areas. Therefore, the number of broadcasting stations is large in metropolitan areas and small and medium metropolitan areas. There is a big difference.
- diversity control is not turned off and a loss of synchronization is likely to occur if a predetermined number is left in the large urban area.
- the predetermined number of broadcasting stations in the metropolitan area is N1, N2 in the small and medium metropolitan areas, and N3 in the other areas (where N1>N2> N3).
- the predetermined number N of broadcast stations can be set more finely.
- FIG. 5 is a diagram showing an example of the data structure of the table 210 that is indexed when a predetermined number is determined as a criterion for suppressing diversity reception in the HD radio receiving apparatus according to Embodiment 2 of the present invention.
- a predetermined number N of receivable broadcasting stations which is a determination criterion for suppression control of diversity reception, is defined for each metropolitan area, small and medium metropolitan area, and other areas. It is recorded in the built-in memory.
- FIG. 6 is a flowchart showing the operation of the HD radio receiving apparatus according to Embodiment 2 of the present invention, and more specifically shows the processing procedure of the control unit 21 of FIG.
- the operation of the HD radio receiving apparatus according to Embodiment 2 of the present invention shown in FIGS. 4 and 5 will be described in detail with reference to the flowchart of FIG.
- the control unit 21 determines the number of broadcasting stations M.
- the control unit 21 regards the metropolitan area as a predetermined number N. In N1, if 6 ⁇ M ⁇ 30, it is regarded as a small and medium metropolitan area, and the predetermined number N is set to N2, and if M is less than 6, it is regarded as another area and the predetermined number N is set to N3 (step ST601). ). For example, by setting N1 to 35, N2 to 10, and N3 to 2, it is possible to control diversity reception with high accuracy.
- the control unit 21 performs a channel selection operation while changing the frequency division ratio of the PLL circuit 16 (step ST602), and sets the frequency of a receivable broadcast station to the reception station memory 22 (Step ST603). Whether or not the broadcast station is receivable is determined by referring to the RSSI output by the reception quality detection unit 17.
- the control unit 21 counts the number of receivable broadcast stations stored in the reception station memory 22, compares the number of receivable broadcast stations with the predetermined number N set in step ST601, and determines the predetermined number N It is determined whether or not there is a receivable broadcasting station as described above (step ST604). If it is determined that there are a predetermined number N or more of receivable broadcasting stations (step ST604 “YES”), the control unit 21 controls the diversity receiving unit 12 to disable diversity reception (step ST605). If there are no more than a few N (“NO” in step ST604), the diversity receiver 12 is controlled to enable diversity reception (step ST606).
- the control unit 21 relates to the number of broadcast stations acquired from the station number setting switch 23 configured by a toggle switch or a rotary switch.
- a predetermined number N is set from the information, the number of receivable broadcasting stations acquired by the channel selection operation is compared with the predetermined number N set in advance, and the diversity receiving unit 12 is controlled according to the comparison result to control the antenna.
- the diversity reception control when receiving an IBOC broadcast, the diversity reception control is switched according to the area in which the vehicle is running, for example, diversity reception is turned off in and around urban areas. Then, by receiving the signal with either one of the antennas (11a or 11b) being fixed, it is possible to avoid “out of synchronization” that occurs at the time of antenna switching. Also, while traveling in and around urban areas, the frequency of antenna switching increases due to the occurrence of multipaths due to high-rise buildings, etc., but antenna switching is recognized by recognizing that it is traveling in urban areas depending on the number of receivable broadcasting stations. By suppressing, “out of synchronization” can be avoided.
- the electric field strength tends to be low while traveling in an area away from the urban area, and analog reception is mainly used. Therefore, reception quality can be improved by turning on diversity reception and receiving with an antenna having a good reception state. It can be increased. It should be noted that the occurrence of multipath is low in areas far from urban areas, and therefore there is little occurrence of “out of synchronization”.
- the control unit 21 determines that the vehicle has entered the small and medium metropolitan area, and the predetermined number of stations initially set.
- the predetermined number N need not be limited to an integer.
- broadcast stations that can be received there are broadcast stations whose reception status varies depending on whether it is day or night, or weather, etc. For example, a broadcast station that can receive only at night is counted as 0.5, and the broadcast station that can be received It is also possible to represent the number as a real number.
- control unit 21 shown in FIGS. 1 and 4 may be realized entirely by software, or at least a part thereof may be realized by hardware.
- the data processing that controls the diversity reception unit 12 to suppress the frequency of antenna switching is one or more It may be realized on a computer by a program, or at least a part thereof may be realized by hardware.
- the radio reception apparatus enables highly flexible diversity reception control and can be a hybrid radio reception apparatus that is highly convenient, and therefore receives digital terrestrial radio broadcasts simultaneously with analog broadcasts. It is suitable for use in a radio receiver suitable for use.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
車両走行中はそのような変動する電波環境の中を移動するため、短い時間内に高い頻度で電界強度の変動が発生しやすい。そのため、最も良い受信状態のアンテナを選択するアンテナ切り替えも頻繁に発生しやすい。
上記した「同期外れ」によるIBOC方式のハイブリッド放送の受信性能の低下を回避するために、従来、復調結果に基づきIBOC放送波が存在すると判定された場合に、ダイバーシティ受信をディセーブル状態に制御するIBOC放送受信機が知られている(例えば、特許文献1参照)。
しかしながら、上記したダイバーシティ受信の切り替えは復調結果によるものであり、受信可能な放送局数の大小が反映されていないため、例えば、都市部走行時におけるマルチパスの影響は考慮されず、リアルタイムに変化する受信環境には適応できない。また、上記したダイバーシティ受信の切り換えは自動的に行われるため、ユーザの意思が反映されず利便性の面でも問題があった。
実施の形態1.
図1は、この発明の実施の形態1に係るハイブリッドラジオ受信装置(以下、HDラジオ受信装置という)の構成を示すブロック図である。
図1に示されるように、この発明の実施の形態1に係るHDラジオ受信装置は、アンテナ11a、11bと、ダイバーシティ受信部12と、フロントエンド13と、FM検波部14と、マルチプレクサ(MPX)復調回路15と、PLL(Phase Locked Loop)回路16と、受信品質検出部17と、IBOCデコード部18と、ブレンド部19と、DAコンバータ(DAC)20と、制御部21と、受信局メモリ22と、により構成される。
FM検波部14の検波出力は、MPX復調回路15に供給され、ステレオ放送の場合は、L(左)、R(右)各チャンネルの信号に分離される。
ブレンド部19は、MPX復調回路15のアナログ放送波の受信音声(以下、アナログ受信音声という)と、IBOCデコード部18のデジタル放送波の受信音声(以下、デジタル受信音声という)とをブレンドしてDAC20へ出力する。
制御部21は更に、上記の選局動作により取得される受信可能放送局数が所定数以上の場合に、ダイバーシティ受信部12を制御してアンテナ切り替えの頻度を抑制する制御を行う。詳細は、図2に示すフローチャートを参照しながら後述する。
以下、図2のフローチャートを参照しながら図1に示すこの発明の実施の形態1に係るHDラジオ受信装置の動作について詳細に説明する。
ここで、受信可能な放送局であるか否かの判定は、制御部21が、受信品質検出部17から出力される受信電界強度が、例えばFM放送局で-90~-110dBm程度以上あれば受信可能と判定する。
ここで、所定数以上の受信可能放送局があると判定されると(ステップST203“YES”)、制御部21は、ダイバーシティ受信部12を制御してダイバーシティ受信を無効にし(ステップST204)、所定数以上無ければ(ステップST203“NO”)、ダイバーシティ受信部12を制御してダイバーシティ受信を有効とするように制御する(ステップST205)。なお、ここで、ダイバーシティ受信を無効にするとは、テジタル放送を受信するアンテナ11aまたは11bの一方をOFF制御し、他方のアンテナ11bまたは11aで放送受信を固定することをいう。
その中で、例えば、Illinois州では、約82の放送局が、異なるあるいは同一の周波数で送信中であるが、そのうちChicagoには59の放送局があり、一方、Chicagoから約200km以上離れたChampaignでは、5局の放送局があり、Quincyでは3局の放送局、Bloomingtonでは1局の放送局がある。Michiganでは、約62の放送局のうち、Detroitに43の放送局があり、都市部に集中する傾向がある。
上記の所定数Nの設定は、HDラジオ放送受信装置の中で固定とするか、あるいはナビゲーションシステムやPNDシステムの位置情報から自動的に取得して設定するようにしても良い。
また、上記したこの発明の実施の形態1に係るHDラジオ受信装置によれば、受信可能放送局数が比較的多い、例えば、都市部の場合にはダイバーシティ受信を無効にすることとして説明したが、受信アンテナを固定することなくアンテナ切り換えの頻度を減少させてもよい。
図4は、この発明の実施の形態2に係るハイブリッドラジオ受信装置(HDラジオ受信装置)の構成を示すブロック図である。
以下に説明する実施の形態2において、図1に示す実施の形態1との差異は、図1に示す実施の形態1に係るHDラジオ受信装置が有する、アンテナ11a、11b、ダイバーシティ受信部12、フロントエンド13、FM検波部14、MPX復調回路15、PLL回路16、受信品質検出部17、IBOCデコード部18、ブレンド部19、DAC20、制御部21、受信局メモリ22の他に、操作入力部としての局数設定スイッチ23を付加したことにある。
都市部あるいはその他地域を走行中に、局数設定スイッチを操作し、都市部、あるいはその他地域の所定数を、4~40放送局の中から選択設定する。ユーザが居住している地区の放送局数に合わせて、所定数を設定することにより良好な受信状態を得ることが出来る。また、ユーザ設定を行うことによりユーザの意思が反映されるため、ユーザに利便性を提供できる。
ここで、受信可能放送局数は、昼夜の電波状態や天候等に影響されるため、現在受信している在圏地区により適した所定数Nを選択できる効果も得られる。
上記したように、ChicagoやDetroit等の大都市圏では40以上の放送局が集中し、他の都市圏では数局程度が送信中であるため、大都市圏と中小都市圏では放送局数に大きな差がある。大都市に居住しているユーザが中小都市に移動した場合、所定数を大都市圏のままにしているとダイバーシティ制御がOFFとならず、同期外れが発生しやすい。
この状態において大都市圏の放送局数の所定数をN1、中小都市圏ではN2、その他の地域ではN3とすることで(但し、N1>N2>N3)、都市部に存在する放送局数に合わせて、放送局数の所定数Nをより細かく設定することが可能である。
テーブル210には、ここでは、大都市圏、中小都市圏、その他地域毎に、ダイバーシティ受信の抑制制御の判定基準となる受信可能放送局数の所定数Nが定義されており、制御部21が内蔵するメモリ中に記録されているものとする。
以下、図6のフローチャートを参照しながら、図4、図5に示すこの発明の実施の形態2に係るHDラジオ受信装置の動作について詳細に説明する。
これをうけて制御部21は、放送局数Mの判定を行うが、図5に示すテーブル210を参照することにより、例えば、Mが30以上であれば大都市圏とみなして所定数NをN1に、6≦M<30であれば中小都市圏とみなして所定数NをN2に、Mが6未満であればその他の地域とみなして所定数NをN3に、それぞれ設定する(ステップST601)。例えば、N1は35、N2は10、N3は2と設定することより、精度の良いダイバーシティ受信の制御が可能になる。
受信可能な放送局か否かの判定は、受信品質検出部17により出力されるRSSIを参照することにより行われる。
ここで、受信可能放送局が所定数N以上あると判定されると(ステップST604“YES”)、制御部21は、ダイバーシティ受信部12を制御してダイバーシティ受信を無効にし(ステップST605)、所定数N以上無ければ(ステップST604“NO”)、ダイバーシティ受信部12を制御してダイバーシティ受信を有効とするように、それぞれ制御する(ステップST606)。
また、一度SEEK動作を行ってから受信可能な放送局数の最大値を計数し、その結果をその地区の放送局数と見なして、大都市圏か中小都市圏か、あるいはその他地域かを判定する方法も有効である。
受信可能な放送局数の最大値が30以上から6~30の間になれば、制御部21は車両が中小都市圏の地域に入ったものと判定し、最初に設定した局数の所定数N1をより小さなN2へ変更することで、アンテナ切り替え時の「同期外れ」を防止することが出来る。
さらに、所定数Nは整数に限る必要はない。受信可能な放送局の中には、昼夜の別、あるいは天候等により受信状態が変動する放送局があり、例えば、夜間のみ受信可能な放送局を0.5と計数し、受信可能な放送局数を実数で表すことも可能である。
例えば、制御部21が、選局動作により取得される受信可能放送局数が所定数以上の場合に、ダイバーシティ受信部12を制御してアンテナ切り替えの頻度を抑制するデータ処理は、1または複数のプログラムによりコンピュータ上で実現してもよく、また、その少なくとも一部をハードウェアで実現してもよい。
Claims (6)
- 複数のアンテナを有し、アンテナ切り換えにより地上デジタルラジオ放送を受信するダイバーシティ受信部と、
選局動作により取得される受信可能放送局数が所定数以上の場合は、前記ダイバーシティ受信を無効とする制御部と、
を備えたことを特徴とするラジオ受信装置。 - 前記制御部は、
受信電界強度が所定値以上の放送局の周波数を前記受信可能放送局数として計数することを特徴とする請求項1記載のラジオ受信装置。 - 自車両の現在位置を検出する位置検出部と、
少なくとも放送局を含む施設を地図情報とともに記憶する記憶部と、を備え
前記制御部は、
前記記憶部を参照し、前記位置検出部により特定される自車両の現在位置から所定距離圏内に在圏する放送局を前記受信可能放送局数として計数することを特徴とする請求項1記載のラジオ受信装置。 - 前記所定数を設定入力する操作入力部を備え、
前記制御部は、
選局動作により取得される受信可能放送局数が、前記操作入力部から取得される所定数以上の場合は、前記ダイバーシティ受信を無効とすることを特徴とする請求項1記載のラジオ受信装置。 - 放送局数に応じた複数の所定数を記憶する記憶部と、
在圏地区の放送局数の情報を設定入力する操作入力部を備え、
前記制御部は、
前記操作入力部から取得される放送局数に基づいて決まる前記所定数を設定し、選局動作により取得される受信可能放送局数が前記設定された所定数以上の場合は、前記ダイバーシティ受信を無効とすることを特徴とする請求項1記載のラジオ受信装置。 - 在圏地区内で受信可能な放送局数の最大値に応じて、前記所定数を設定することを特徴とする請求項5記載のラジオ受信装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/121,954 US8054923B2 (en) | 2009-01-23 | 2009-10-05 | Radio receiver |
JP2010545707A JP4749512B2 (ja) | 2009-01-23 | 2009-10-05 | ラジオ受信装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009013120 | 2009-01-23 | ||
JP2009-013120 | 2009-01-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010084536A1 true WO2010084536A1 (ja) | 2010-07-29 |
Family
ID=42355615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/005153 WO2010084536A1 (ja) | 2009-01-23 | 2009-10-05 | ラジオ受信装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US8054923B2 (ja) |
JP (1) | JP4749512B2 (ja) |
WO (1) | WO2010084536A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9065569B2 (en) * | 2011-10-26 | 2015-06-23 | Mastercard International Incorporated | Mobile device output test setting |
CN104919652A (zh) * | 2012-12-31 | 2015-09-16 | 诺基亚技术有限公司 | 包括天线和至少一个用户致动开关的装置,方法和计算机程序 |
US9794011B2 (en) * | 2014-06-27 | 2017-10-17 | GM Global Technology Operations LLC | Activating a digital radio broadcast receiver in a vehicle |
US9832007B2 (en) * | 2016-04-14 | 2017-11-28 | Ibiquity Digital Corporation | Time-alignment measurement for hybrid HD radio™ technology |
US10666416B2 (en) | 2016-04-14 | 2020-05-26 | Ibiquity Digital Corporation | Time-alignment measurement for hybrid HD radio technology |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05259736A (ja) * | 1992-03-13 | 1993-10-08 | Nissan Motor Co Ltd | 電子制御アンテナシステム |
JPH0993170A (ja) * | 1995-09-21 | 1997-04-04 | Alpine Electron Inc | 多重放送受信機 |
JP2004349805A (ja) * | 2003-05-20 | 2004-12-09 | Alpine Electronics Inc | Iboc放送受信機 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2745081B2 (ja) * | 1990-10-22 | 1998-04-28 | 富士通テン株式会社 | 複数波同時受信機 |
US6032033A (en) * | 1996-12-03 | 2000-02-29 | Nortel Networks Corporation | Preamble based selection diversity in a time division multiple access radio system using digital demodulation |
JP2000151318A (ja) * | 1998-11-10 | 2000-05-30 | Fujitsu Ltd | 無線携帯端末の周辺レベル検出装置 |
US6799026B1 (en) * | 1999-11-09 | 2004-09-28 | Kathrein-Werke Kg | Handset diversity in wireless communications system |
DE60029303T2 (de) * | 2000-04-28 | 2007-07-05 | Siemens Ag | Empfänger mit Antennendiversity |
JP3986308B2 (ja) * | 2001-12-14 | 2007-10-03 | 松下電器産業株式会社 | 携帯電話機 |
EP1533917A1 (en) * | 2003-11-18 | 2005-05-25 | Mitsubishi Electric Information Technology Centre Europe B.V. | Antenna diversity switch for a receiver system and method using this switch |
JP2005223784A (ja) * | 2004-02-09 | 2005-08-18 | Alps Electric Co Ltd | ダイバーシティ受信機 |
-
2009
- 2009-10-05 US US13/121,954 patent/US8054923B2/en not_active Expired - Fee Related
- 2009-10-05 JP JP2010545707A patent/JP4749512B2/ja not_active Expired - Fee Related
- 2009-10-05 WO PCT/JP2009/005153 patent/WO2010084536A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05259736A (ja) * | 1992-03-13 | 1993-10-08 | Nissan Motor Co Ltd | 電子制御アンテナシステム |
JPH0993170A (ja) * | 1995-09-21 | 1997-04-04 | Alpine Electron Inc | 多重放送受信機 |
JP2004349805A (ja) * | 2003-05-20 | 2004-12-09 | Alpine Electronics Inc | Iboc放送受信機 |
Also Published As
Publication number | Publication date |
---|---|
US8054923B2 (en) | 2011-11-08 |
JP4749512B2 (ja) | 2011-08-17 |
US20110188609A1 (en) | 2011-08-04 |
JPWO2010084536A1 (ja) | 2012-07-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4614906B2 (ja) | 受信装置 | |
JP4749512B2 (ja) | ラジオ受信装置 | |
US7574232B2 (en) | Mobile communication terminal and signal receiving method thereof | |
JP2001285092A (ja) | 移動体用受信機 | |
JP2008042743A (ja) | 無線受信機およびアンテナ切替制御方法 | |
US8483635B2 (en) | Broadcast receiving apparatus and radio receiving apparatus | |
WO2005122413A1 (ja) | 受信装置 | |
JP2007189458A (ja) | 放送受信機能付き携帯移動電話機 | |
JP3959187B2 (ja) | 車載用受信装置 | |
JP4870399B2 (ja) | ディジタル放送受信装置 | |
JP2006197498A (ja) | 移動受信方法と、移動受信装置 | |
JP2009188492A (ja) | 移動体デジタル放送受信チューナ | |
JP5289621B2 (ja) | 受信装置 | |
JP2010028186A (ja) | ダイバーシティ受信装置、およびダイバーシティ受信方法 | |
JP2000138566A (ja) | 放送受信装置 | |
KR101196749B1 (ko) | 다이버시티 수신을 이용한 디지털 방송 단말기 및 운용방법 | |
KR20090076705A (ko) | 이동 디지털 방송에서 핸드오버를 수행하는 단말 | |
JP2008005231A (ja) | 受信装置 | |
JP5548097B2 (ja) | 受信装置、および受信方法 | |
JP2007195041A (ja) | 放送受信装置 | |
JP2000209071A (ja) | 車載用受信装置 | |
KR20050094032A (ko) | 방송신호의 수신감도 향상을 위한 다이버시티 시스템 및그 제어 방법 | |
JP2000261338A (ja) | ラジオ放送受信機 | |
JP5717934B2 (ja) | 移動体用放送受信装置 | |
JP2003283409A (ja) | 移動体通信システムおよび移動体端末 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09838730 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010545707 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13121954 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 09838730 Country of ref document: EP Kind code of ref document: A1 |