WO2012025953A1 - ラジオ受信装置 - Google Patents
ラジオ受信装置 Download PDFInfo
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- WO2012025953A1 WO2012025953A1 PCT/JP2010/005208 JP2010005208W WO2012025953A1 WO 2012025953 A1 WO2012025953 A1 WO 2012025953A1 JP 2010005208 W JP2010005208 W JP 2010005208W WO 2012025953 A1 WO2012025953 A1 WO 2012025953A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
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- 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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
Definitions
- the present invention relates to a radio receiver that presets the frequency of an effective station that has received a seek within the frequency band of an AM or FM broadcast wave.
- Patent Document 1 describes a broadcast receiving apparatus having a seek function for receiving a seek in the frequency band of an AM broadcast wave and stopping a seek operation when the received reception frequency is an effective station.
- this broadcast receiver in the middle and strong electric field areas, multiple frequencies of the broadcast station's reception frequency and spurious frequencies due to the sum / difference frequencies of multiple stations are stored in the preset memory, and seek operation stops erroneously (seek miss stop). To avoid.
- the second and limited third harmonic and fourth harmonic spurious frequencies are experienced from the sum / difference calculation of these strong electric field received frequencies.
- the calculated spurious frequency is controlled so as not to be stored in the preset memory.
- the spurious frequency can be predicted by the sum / difference calculation of the reception frequencies of two strong electric field stations or multiples thereof, but only the empirical sum / difference calculation, There is a problem that it is impossible to calculate all the spurious frequencies assumed from the number of strong electric field stations and their reception frequencies.
- the present invention has been made to solve the above-described problems. By calculating spurious frequencies assumed from a plurality of strong electric field stations and their reception frequencies, the spurious frequencies are preset.
- An object of the present invention is to obtain a radio receiver that can be prevented.
- the radio receiving apparatus includes a strong input determining unit that determines a strong electric field station existing in the reception frequency band of a broadcast wave, and a plurality of strong electric field stations that are determined by the strong input determining unit. All spurious frequencies within the reception frequency band are calculated by performing sum and difference operations on each frequency of the overlapping combination of broadcasting station frequencies of the strong electric field station, and the signal strength of the received signal at a certain frequency is a predetermined threshold value. If the frequency is estimated to be a spurious frequency even if the frequency exceeds, a spurious station calculation / determination unit that controls not to preset the frequency is provided.
- a sum and difference calculation is performed on each frequency of overlapping combinations of broadcasting station frequencies of a plurality of strong electric field stations to calculate all the spurious frequencies within the reception frequency band, and a received signal at a certain frequency. Even if the signal intensity exceeds the predetermined threshold value, if it is estimated that it is a spurious frequency, control is performed so that the frequency is not preset.
- the spurious frequency assumed from the frequencies of the plurality of strong electric field stations without omission and to prevent the spurious frequencies from being preset. effective.
- FIG. 1 is a block diagram showing a configuration of an in-vehicle radio receiving apparatus to which a radio receiving apparatus according to Embodiment 1 of the present invention is applied.
- an in-vehicle radio receiver 1 includes a radio antenna 2a, an RF unit 2, an RFAGC 3, a mixer circuit (MIXER) 4, an AD (Analog-Digital) converter 5, an IF processing unit 6, a detector 7, and signal intensity detection.
- Device 8 audio processing unit 9, DA (Digital-Analog) converter 10, amplifier 11, navigation processing unit 12, database 13, storage device 14, CPU 15, operation unit 16, display unit 17, and speaker 18.
- the RF unit 2 amplifies the RF signal of AM broadcast or FM broadcast received via the radio antenna 2a at high frequency.
- the mixer circuit (MIXER) 4 generates an intermediate frequency (IF) signal by mixing the signal amplified by the RF unit 2 and the output signal (local oscillation frequency signal) of the local oscillation circuit (not shown in FIG. 1).
- RFAGC (RF Auto Gain Control) 3 automatically controls the RF signal level to be constant according to the received RF signal level. When the RF signal level exceeds a predetermined range, the RF signal is attenuated by the RFAGC 3.
- the AD converter 5 samples the IF signal from the front end mixer circuit 4 and converts it into a digital signal.
- the IF processing unit 6 performs processing such as IF signal band limitation.
- the detector 7 detects the IF signal processed by the IF processing unit 6 and outputs a modulated signal. That is, the detector 7 detects the audio signal and the signal intensity from the output signal of the IF processing unit 6.
- the signal strength detector 8 measures the signal strength from the output of the detector 7.
- the audio processing unit 9 adjusts the volume and tone control of the audio signal detected by the detector 7.
- the DA converter 10 converts the digital signal output from the audio processing unit 9 into an analog signal.
- the amplifier 11 amplifies the analog output signal of the DA converter 10 to power that can be output by the speaker 18.
- the navigation processing unit 12 acquires position information of the vehicle on which the radio reception device is mounted based on a detection signal from a position detection unit (not shown) and map data stored in the database 13.
- the database 13 is a database that stores data necessary for navigation processing, and stores map data and the like.
- the storage device 14 stores a PI code storage area for storing a PI (Program Identifier) code of a broadcast station received in the past, a preset memory area for storing a seek station frequency, and a preset for storing a frequency estimated as a spurious frequency. A storage device having a prohibited frequency storage area.
- the CPU 15 controls the components in the in-vehicle radio receiver 1 and calculates spurious frequencies estimated from the broadcast station frequencies of a plurality of strong electric field stations (strong input stations) within the reception frequency band without any omissions. A process for preventing a seek miss stop is performed.
- the spurious frequency is a frequency at which interference occurs due to the broadcast station frequency from the strong electric field station.
- the CPU 15 controls the components in the in-vehicle radio reception device 1 to stop the seek operation when the frequency received in the reception frequency band is a valid station, and the received broadcast station frequency is stored in the storage device 14. Store in the preset memory area.
- the operation unit 16 is a configuration unit that accepts an operation from the outside, and notifies the CPU 15 of an operation mode set by a user operation.
- the display unit 17 inputs display data created in the CPU 15 and displays it on the display screen.
- the speaker 18 outputs the radio signal amplified by the amplifier 11 as sound.
- FIG. 2 is a block diagram showing a functional configuration of the CPU of FIG.
- the CPU 15 executes a control program according to the gist of the present invention, and as a specific means in which software and hardware cooperate, a strong input determination unit 21, a spurious station calculation / determination is performed.
- the unit 22, the audio processing control unit 23, the tuner control unit 24, and the storage device control unit 25 are realized.
- the strong input determination unit 21 is a configuration unit that determines a strong electric field station (strong input station) in the reception frequency band. Specifically, the strong input determination unit 21 detects a broadcast station in which the signal strength of the received signal detected by the signal strength detector 8 is extremely high exceeding a predetermined threshold and the RFAGC 3 is saturated with a strong electric field. Judge as a station. Although FIG. 1 shows the RF stage AGC, an IF stage AGC may be provided, and a broadcasting station in which IFAGC and RFAGC 3 are saturated in gain may be determined as a strong electric field station.
- the spurious station calculation / determination unit 22 is estimated as a spurious frequency within the reception frequency band from the broadcast station frequency of the m station (m is a natural number) determined by the strong input determination unit 21 as a strong electric field station. This is a component that calculates the frequency to be calculated. Specifically, from the broadcasting station frequencies of m stations determined to be strong electric field stations, an overlapping combination of broadcasting station frequencies that can form an Nth order (N is a natural number of 2 or more) harmonic is calculated, and the combination of these combinations is calculated. The frequency estimated as the spurious frequency is calculated from the sum / difference frequency calculation.
- the spurious station calculation / determination unit 22 counts the broadcasting stations having the same PI code in the area where the vehicle travels based on the position information of the vehicle obtained by the navigation processing unit 12. Determine a PI code with many alternative stations. Furthermore, the spurious station calculation / determination unit 22 controls the tuner control unit 24 to seek-receive a receivable station in the reception frequency band, and stops the seek operation when the seek received frequency is an effective station, and the storage device The received broadcast station frequency is stored in the preset memory area of the storage device 14 via the control unit 25.
- the audio processing control unit 23 controls the audio processing unit 9 based on the content of the operation by the operation unit 16 to adjust the sound quality and the volume.
- the tuner control unit 24 controls the IF processing unit 6 and the detector 7 based on the operation content by the operation unit 16 and performs a channel selection operation.
- the storage device control unit 25 stores the PI code of the broadcasting station related to the vehicle position determined by the spurious station calculation / determination unit 22, the frequency determined as the effective station by the seek reception, and the frequency estimated as the spurious frequency. 14 stored.
- FIG. 3 is a flowchart showing the flow of operations performed by the in-vehicle radio receiver 1, and shows details of the spurious frequency elimination processing that is performed when only the frequency of the effective station of the FM broadcast wave is preset.
- the strong input determination unit 21 of the CPU 15 first receives signal strengths (signals) of all frequencies in the reception frequency band detected by the signal strength detector 8. Level) is read (step ST1).
- the strong input determination unit 21 is for m stations where the signal strength is extremely high above a predetermined threshold value and the RFAGC 3 is causing gain saturation among the reception signals of all frequencies read out in step ST1. Are determined to be strong electric field stations within the reception frequency band and extracted (step ST2).
- the spurious station calculation / determination unit 22 calculates the frequency estimated as the spurious frequency of the Nth harmonic among the m stations extracted by the strong input determination unit 21, so that the N wave from the m wave all the combinations of overlapping (m H N Street) extracted (step ST3).
- N 2
- the frequency due to the IM2 component disortion component due to the second harmonic of the nonlinear device
- the spurious station computation / determination unit 22 performs sum / difference computation of each frequency in each combination of frequencies obtained in step ST3 (step ST4). For example, when the sum frequency and the difference frequency of each set are calculated in consideration of all the combinations of codes in the above-described overlapping combinations, the following is obtained.
- the spurious station calculation / determination unit 22 notifies the storage device control unit 25 of the frequencies calculated in step ST4, excluding the frequencies other than the reception frequency band that is the preset target.
- the storage device control unit 25 stores the frequency notified from the spurious station calculation / determination unit 22 in the preset prohibition frequency storage area of the storage device 14 as a frequency estimated as the spurious frequency.
- the process so far corresponds to step ST5.
- the signal intensity actually measured at the frequency stored in the preset prohibition frequency storage area of the storage device 14 exceeds the signal intensity (stop level) for stopping the seek, it is not stored in the preset memory area of the storage device 14.
- step ST6 the spurious station calculation / determination unit 22 determines whether N is 3 or less.
- step ST6 YES
- the process proceeds to step ST7.
- the second harmonic spurious frequency that can be generated at the m-wave broadcasting station frequency and the estimated frequency overlapping combination are followed by the third harmonic spurious frequency and the estimated frequency overlapping combination ( m H 3 ) and the 4th harmonic spurious frequency and the estimated frequency overlap combination ( mH 4 ) are calculated, and the corresponding one in the reception frequency band is stored in the preset prohibition frequency storage area of the storage device 14.
- the spurious station calculation / determination unit 22 determines whether the electric field strength actually measured at the frequency estimated as the spurious frequency stored in the storage device 14 is equal to or less than the stop level. It is determined whether or not (step ST8). That is, the spurious station calculation / determination unit 22 reads out the frequency stored in the preset prohibition frequency storage area of the storage device 14 via the storage device control unit 25, and sends the frequency to the tuner control unit 24 so as to select the read frequency. Instruct. The spurious station calculation / determination unit 22 acquires a comparison result between the signal intensity actually measured by the signal intensity detector 8 at the frequency selected in this way and the stop level from the strong input determination unit 21, and the comparison result is obtained. The above determination is made based on this.
- the spurious station calculation / determination unit 22 determines the fifth or higher harmonic spurious. It is determined that the reception state is affected by the frequency, the process returns to step ST7, and the processes from step ST3 to step ST5 are performed. Thereby, the overlapping combination ( mH 5 types) of the estimated frequency and the estimated spurious frequency of the fifth harmonic is calculated, and the corresponding one in the reception frequency band is stored in the preset prohibition frequency storage area of the storage device 14.
- step ST3 to step ST5 is repeated until all the electric field strengths of the frequencies estimated as spurious frequencies stored in the preset prohibition frequency storage area of the storage device 14 are equal to or lower than the stop level, and the Nth order harmonics are repeated.
- the processing from step ST3 to step ST5 is repeated until all the electric field strengths of the frequencies estimated as spurious frequencies stored in the preset prohibition frequency storage area of the storage device 14 are equal to or lower than the stop level, and the Nth order harmonics are repeated.
- the processing from step ST3 to step ST5 is repeated until all the electric field strengths of the frequencies estimated as spurious frequencies stored in the preset prohibition frequency storage area of the storage device 14 are equal to or lower than the stop level, and the Nth order harmonics are repeated.
- the corresponding information is stored in the preset prohibition frequency storage area of the storage device 14.
- the spurious station calculation / determination unit 22 sequentially reads the frequencies stored in the preset prohibition frequency storage area of the storage device 14 via the storage device control unit 25, and performs tuner control so as to select the read frequency.
- the unit 24 is instructed.
- the spurious station calculation / determination unit 22 acquires the determination result of the beat presence / absence by the audio processing unit 9 at the frequency selected in this way via the audio processing control unit 23, and based on this determination result, the real station It is determined whether the frequency is a broadcasting station frequency.
- the frequency is regarded as the broadcasting station frequency of the existing station and stored in the preset memory (step ST10). That is, when the navigation processing unit 12 acquires information including the frequency of a broadcasting station broadcasting in the region as the region information (for example, the region where the vehicle is traveling), the spurious station calculation / determination unit 22 Then, the area information is acquired from the navigation processing unit 12, and the frequency of the broadcasting station in the area is compared with the frequency stored in the preset prohibition frequency storage area of the storage device 14, and if they match, the frequency is determined to be the actual station. It is regarded as the broadcasting station frequency.
- the frequency is preset as the broadcasting station frequency of the existing station.
- the spurious station calculation / determination unit 22 reads the frequency estimated as the spurious frequency stored in the storage device 14 via the storage device control unit 25 and the PI code stored at that location in the past, and uses the PI code.
- the frequency at which the broadcast station frequency of the specified broadcast station matches the estimated frequency of the spurious frequency is regarded as the broadcast station frequency of the existing station.
- the frequency determined not to be a spurious frequency in the above processing and the actually measured signal intensity exceeding the stop level is stored as a broadcasting station frequency in the preset memory area of the storage device 14 (step ST12).
- the sum and difference calculation is performed on each frequency of the overlapping combination of the broadcasting station frequencies of the strong electric field station, so that all the spurious frequencies estimated within the reception frequency band are obtained.
- a frequency is calculated, and control is performed so as not to preset the frequency even if the actually measured signal strength of the received signal exceeds a predetermined threshold at the calculated spurious frequency.
- the spurious station calculation / determination unit 22 has a signal strength of a received signal at a frequency estimated to be a spurious frequency that exceeds a predetermined threshold, and the received signal has a low frequency. If the beat of the above is observed, it is assumed that the broadcasting station exists and the frequency is preset. In this way, it is possible to accurately preset a frequency corresponding to the actual broadcast station frequency.
- the navigation processing unit 12 that acquires regional information including the reception frequency of the local broadcasting station is provided, and the spurious station calculation / determination unit 22 includes the spurious frequency estimated frequency.
- the signal strength of the received signal at that frequency exceeds a predetermined threshold and the frequency matches the received frequency of the broadcast station included in the area information acquired by the navigation processing unit 12, the broadcast station actually exists. Assuming that frequency is preset. In this way, it is possible to accurately preset a frequency corresponding to the actual broadcast station frequency.
- the spurious station calculation / determination unit 22 has a signal strength of a received signal at a frequency that is estimated as a spurious frequency exceeds a predetermined threshold value, and If the PI code of the broadcast station has been acquired in advance, the frequency is preset. In this way, it is possible to accurately preset a frequency corresponding to the actual broadcast station frequency. It should be noted that the present invention can be freely combined with or modified from the embodiments within the spirit of the invention.
- the radio receiving apparatus can prevent a seek miss stop due to a spurious frequency, and is therefore suitable for an on-vehicle radio receiving apparatus that may travel in a strong electric field area.
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- Computer Hardware Design (AREA)
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Abstract
Description
このように、複数の強電界局の放送局周波数の重複組み合わせを用いることによって、複数強電界局の周波数から想定されるスプリアス周波数を漏れなく算出でき、スプリアス周波数がプリセットされることを防止できるという効果がある。
実施の形態1.
図1は、この発明の実施の形態1によるラジオ受信装置を適用した車載ラジオ受信装置の構成を示すブロック図である。図1において、車載ラジオ受信装置1は、ラジオアンテナ2a、RF部2、RFAGC3、ミキサ回路(MIXER)4、AD(Analog-Digital)変換器5、IF処理部6、検波器7、信号強度検出器8、オーディオ処理部9、DA(Digital-Analog)変換器10、アンプ11、ナビゲーション処理部12、データベース13、記憶装置14、CPU15、操作部16、表示部17及びスピーカ18を備える。
具体的には、強電界局と判定されたm局の放送局周波数から、N次(Nは2以上の自然数)高調波を構成し得る放送局周波数の重複組み合わせを算出し、これらの組み合わせの和・差周波数演算から、スプリアス周波数として推定される周波数を算出する。
また、スプリアス局演算・判定部22は、ナビゲーション処理部12で得られた自車の位置情報に基づいて、自車が走行するエリアにおいて同一のPIコードを有する放送局をカウントすることで、最も多くの代替局を有するPIコードを決定する。
さらに、スプリアス局演算・判定部22は、チューナ制御部24を制御して受信周波数帯域で受信可能局をシーク受信させ、シーク受信した周波数が有効局であると、シーク動作を停止し、記憶装置制御部25を介して、当該受信した放送局周波数を記憶装置14のプリセットメモリ領域に記憶する。
図3は、車載ラジオ受信装置1による動作の流れを示すフローチャートであって、FM放送波の有効局の周波数のみをプリセットする際に行う、スプリアス周波数の排除処理の詳細を示している。
操作部16を用いた操作でオートプリセットを起動すると、先ず、CPU15の強入力判定部21が、信号強度検出器8に検出された受信周波数帯域における、全ての周波数の受信信号の信号強度(信号レベル)を読み出す(ステップST1)。
例えば、上記重複組み合わせで、全ての符号の組み合わせを加味して各組の和の周波数及び差の周波数を算出すると、下記のようになる。
-2α、-α+α=0、α-α=0、2α
-2β、-β+β=0、β-β=0、2β
-2γ、-γ+γ=0、γ-γ=0、2γ
-α-β、α-β、-α+β、α+β
-β-γ、β-γ、-β+γ、β+γ
-γ-α、γ-α、-γ+α、γ+α
ここで、負の値や0の周波数はあり得ないので、現実的に発生するスプリアス周波数がα<β<γであると、下記の組み合わせの周波数がスプリアス周波数と推定される。
2α、β-α、α+β、2β、γ-β、γ+β、2γ、γ-α、γ+α
すなわち、スプリアス局演算・判定部22が、記憶装置制御部25を介して記憶装置14のプリセット禁止周波数記憶領域に記憶される周波数を読み出し、読み出した周波数を選局するようにチューナ制御部24に指示する。スプリアス局演算・判定部22は、このように選局された周波数で信号強度検出器8により実測された信号強度とストップレベルとの比較結果を強入力判定部21から取得し、この比較結果に基づいて上記判定を行う。
以降、記憶装置14のプリセット禁止周波数記憶領域に記憶したスプリアス周波数と推定される周波数の電界強度が全てストップレベル以下になるまで、ステップST3からステップST5までの処理が繰り返されて、N次高調波のスプリアス周波数と推定される周波数のそれぞれの重複組み合わせ(mHN通り、N=6,7,8,・・・,n)が算出され、これら重複組み合わせの周波数のうち、受信周波数帯域内に該当するものが記憶装置14のプリセット禁止周波数記憶領域に記憶される。
すなわち、スプリアス局演算・判定部22が、記憶装置制御部25を介して記憶装置14のプリセット禁止周波数記憶領域に記憶される周波数を順次読み出させ、読み出した周波数を選局するようにチューナ制御部24に指示する。スプリアス局演算・判定部22は、このように選局された周波数における、オーディオ処理部9によるビート有無の判定結果をオーディオ処理制御部23を介して取得し、この判定結果に基づいて実在局の放送局周波数であるか否かの判断を行う。
なお、本願発明はその発明の精神の範囲内において、各実施の形態の自由な組合せ、あるいは変形が可能である。
Claims (6)
- 受信周波数帯域内で放送波の受信信号の信号強度が所定の閾値を越える放送局をシーク受信して、受信に適した放送局の周波数としてプリセットするラジオ受信装置において、
前記放送波の受信周波数帯域内に存在する強電界局を判定する強入力判定部と、
前記強入力判定部で複数の強電界局が存在すると判定されると、前記複数の強電界局の放送局周波数の重複組み合わせの各周波数に和及び差演算を、2次以上の各次数の高調波について施すことで、前記受信周波数帯域内でスプリアス周波数を全て算出し、スプリアス周波数での受信信号の信号強度が前記所定の閾値を越えても、当該周波数をプリセットしないように制御するスプリアス局演算・判定部とを備えたことを特徴とするラジオ受信装置。 - 前記強入力判定部は、放送波の受信信号の信号強度が所定の閾値を越えており、かつ自動利得制御回路部でゲイン制御が飽和している放送局を強電界局であると判定することを特徴とする請求項1記載のラジオ受信装置。
- 前記スプリアス局演算・判定部は、前記スプリアス周波数での受信信号の信号強度が所定の閾値を越えており、かつ当該受信信号に低周波数のビートが観測される場合、放送局が実在するとみなして当該周波数をプリセットすることを特徴とする請求項1記載のラジオ受信装置。
- 地域の放送局の受信周波数を含む地域情報を取得するナビゲーション処理部を備え、
前記スプリアス局演算・判定部は、前記スプリアス周波数のうち、その周波数での受信信号の信号強度が所定の閾値を越えており、かつ前記ナビゲーション処理部によって取得された前記地域情報に含まれる放送局の受信周波数に一致する周波数については、放送局が実在するとみなして当該周波数をプリセットすることを特徴とする請求項1記載のラジオ受信装置。 - 前記スプリアス局演算・判定部は、前記スプリアス周波数のうち、その周波数での受信信号の信号強度が所定の閾値を越えており、かつ当該周波数で以前に放送局のPI(Program Identifier)コードが取得されている場合、当該周波数をプリセットすることを特徴とする請求項1記載のラジオ受信装置。
- 前記スプリアス局演算・判定部による高調波の計算は、算出したスプリアス周波数での実測電界強度が全て所定の閾値未満になる次数の高調波まで行うことを特徴とする請求項1記載のラジオ受信装置。
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CN201080066548.6A CN102870334B (zh) | 2010-08-24 | 2010-08-24 | 无线电接收装置 |
PCT/JP2010/005208 WO2012025953A1 (ja) | 2010-08-24 | 2010-08-24 | ラジオ受信装置 |
US13/639,431 US8606202B2 (en) | 2010-08-24 | 2010-08-24 | Radio receiver apparatus |
JP2012530414A JP5355794B2 (ja) | 2010-08-24 | 2010-08-24 | ラジオ受信装置 |
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PCT/JP2010/005208 WO2012025953A1 (ja) | 2010-08-24 | 2010-08-24 | ラジオ受信装置 |
Country Status (4)
Country | Link |
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US (1) | US8606202B2 (ja) |
JP (1) | JP5355794B2 (ja) |
CN (1) | CN102870334B (ja) |
WO (1) | WO2012025953A1 (ja) |
Families Citing this family (2)
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KR101556618B1 (ko) | 2013-10-16 | 2015-10-01 | 팅크웨어(주) | 다양한 사용자 네트워크 환경 지원 및 자유로운 데이터 권역 설정을 위한 지도 데이터 제공 장치 및 방법과 그 시스템 |
CN107769803B (zh) * | 2016-08-22 | 2020-05-12 | 博通集成电路(上海)股份有限公司 | 改善调幅解调输出信号的音质的方法和装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05206737A (ja) * | 1991-02-06 | 1993-08-13 | Motorola Inc | Am・fm一体型ステレオ受信機 |
JPH06140854A (ja) * | 1992-10-22 | 1994-05-20 | Toshiba Corp | 受信装置 |
JP2003283302A (ja) * | 2002-03-25 | 2003-10-03 | Clarion Co Ltd | 放送受信装置 |
JP2008109256A (ja) * | 2006-10-24 | 2008-05-08 | Matsushita Electric Ind Co Ltd | デジタル放送受信機 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4264976A (en) * | 1978-03-17 | 1981-04-28 | Sanyo Electric Co., Ltd. | Tuning control apparatus for digital tuner |
US4661995A (en) * | 1985-02-21 | 1987-04-28 | Anritsu Electric Co., Limited | Multi-superheterodyne receiver |
DE4201542C2 (de) * | 1992-01-22 | 1994-03-03 | Rohde & Schwarz | Anordnung zum Unterdrücken von im Empfangssignal des Empfängers eines Hochfrequenz-Nachrichten-Übertragungssystems auftretenden Störsignalen |
JP2003331387A (ja) * | 2002-05-09 | 2003-11-21 | Kenwood Corp | 多重放送選局装置及び方法 |
US7123892B2 (en) * | 2003-10-10 | 2006-10-17 | Freescale Semiconductor, Inc. | Architecture for an AM/FM digital intermediate frequency radio |
-
2010
- 2010-08-24 US US13/639,431 patent/US8606202B2/en not_active Expired - Fee Related
- 2010-08-24 WO PCT/JP2010/005208 patent/WO2012025953A1/ja active Application Filing
- 2010-08-24 JP JP2012530414A patent/JP5355794B2/ja not_active Expired - Fee Related
- 2010-08-24 CN CN201080066548.6A patent/CN102870334B/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05206737A (ja) * | 1991-02-06 | 1993-08-13 | Motorola Inc | Am・fm一体型ステレオ受信機 |
JPH06140854A (ja) * | 1992-10-22 | 1994-05-20 | Toshiba Corp | 受信装置 |
JP2003283302A (ja) * | 2002-03-25 | 2003-10-03 | Clarion Co Ltd | 放送受信装置 |
JP2008109256A (ja) * | 2006-10-24 | 2008-05-08 | Matsushita Electric Ind Co Ltd | デジタル放送受信機 |
Also Published As
Publication number | Publication date |
---|---|
US20130029621A1 (en) | 2013-01-31 |
CN102870334A (zh) | 2013-01-09 |
JP5355794B2 (ja) | 2013-11-27 |
US8606202B2 (en) | 2013-12-10 |
CN102870334B (zh) | 2014-11-12 |
JPWO2012025953A1 (ja) | 2013-10-28 |
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