WO2006061930A1 - 受信装置 - Google Patents
受信装置 Download PDFInfo
- Publication number
- WO2006061930A1 WO2006061930A1 PCT/JP2005/016545 JP2005016545W WO2006061930A1 WO 2006061930 A1 WO2006061930 A1 WO 2006061930A1 JP 2005016545 W JP2005016545 W JP 2005016545W WO 2006061930 A1 WO2006061930 A1 WO 2006061930A1
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- WO
- WIPO (PCT)
- Prior art keywords
- level
- signal
- frequency
- receiving
- comparison result
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
- H03J2200/06—Tuning of antenna
Definitions
- the present invention relates to a receiving device including a receiving antenna having a variable resonance frequency, and more particularly to a receiving device capable of controlling the resonance frequency of a receiving antenna.
- a receiving antenna used in a mobile receiver is composed of a single element.
- a so-called unimodal VSWR voltage standing
- the reception sensitivity is greatly reduced in the frequency band excluding the vicinity of the center frequency.
- the VSWR deteriorates remarkably, and the reception sensitivity is greatly reduced in the frequency band excluding the vicinity of the center frequency.
- Patent Document 1 Japanese Patent Application Laid-Open No. 10-209897 (pages 3 to 6, FIGS. 1 to 6)
- the control voltage corresponding to the reception frequency is applied to the variable capacitance element tl to obtain good VSWR characteristics in the reception frequency band.
- reception is performed in a wide band using a single-element reception antenna
- the reception frequency band there was a problem that a desired broadcast wave could not be received satisfactorily, although a good VSWR characteristic was obtained, and the received electric field strength of the disturbing wave was high.
- the present invention has been made to solve the above-described problems, and eliminates the influence of interference waves.
- An object of the present invention is to provide a receiving apparatus that can always receive a desired broadcast wave satisfactorily.
- a receiving apparatus receives a desired transmission signal as a reception signal, and is received by a reception antenna capable of adjusting a resonance frequency, a frequency adjusting unit for adjusting the resonance frequency, and the reception antenna. And a control means for controlling the frequency adjusting means in accordance with the received electric field level of the received signal.
- V because it is configured to change the resonance frequency of the receiving antenna
- V can successfully receive a desired transmission signal as a reception signal, there is an effect.
- FIG. 1 is a block diagram showing an example of a receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing the unimodal VSWR characteristics of the receiving antenna shown in FIG.
- FIG. 3 is a diagram for explaining a change in resonance frequency of the receiving antenna shown in FIG. 1.
- FIG. 4 is a channel spectrum diagram showing a state in which a digital broadcast wave and an analog broadcast wave are adjacent to each other.
- FIG. 5 is a diagram showing an analog broadcast wave adjacent to a low frequency side of a digital broadcast wave.
- FIG. 6 is a diagram for explaining the influence of the analog broadcast wave shown in FIG. 5.
- (a) shows the input level to the RF-AGC shown in FIG. 1
- (b) shows the SAW shown in FIG.
- (C) is a diagram showing the input level to IF-AGC shown in Fig. 1
- (d) is a diagram showing the output level of IF-AGC.
- FIG. 7 is a channel spectrum diagram showing a state in which different digital broadcast waves are adjacent to each other.
- FIG. 8 Diagrams for explaining the influence of adjacent digital broadcast waves shown in Fig. 7.
- (a) shows the input level to RF-AGC shown in Fig. 1, and
- (b) shows the RF-AGC.
- Figure (c) shows the output level
- Figure (c) shows the input level to the IF-AGC shown in Figure 1
- (d) shows the IF-AGC output level.
- FIG. 9 is a block diagram showing a configuration of a reception electric field condition identification unit shown in FIG. 1.
- FIG. 10 is a flowchart for explaining the operation of the electric field determination unit shown in FIG.
- FIG. 11 is a diagram showing a state where the position of the resonance frequency shown in FIG. 5 is slightly shifted to the high frequency side.
- FIG. 12 is a diagram showing an analog broadcast wave adjacent to a high frequency side of a digital broadcast wave.
- FIG. 13 is a diagram showing a state in which the position of the resonance frequency shown in FIG. 7 is largely shifted to the low frequency side.
- a receiver that receives a terrestrial digital TV broadcast wave (hereinafter simply referred to as a digital broadcast wave) as a broadcast wave will be described, but the same applies to a receiver that receives an analog broadcast wave. Can be applied.
- a receiving apparatus 10 shown in FIG. 1 is mounted on a moving body such as a vehicle, and receives a digital broadcast wave (transmission signal) as a reception signal as described later.
- the receiving device 10 includes a single element receiving antenna 11, and the receiving antenna 11 is connected to a receiver 12.
- the receiving antenna 11 has a unimodal VSW R characteristic that resonates at the center frequency fO.
- the receiving antenna 11 is provided with a variable reactance element 1 la, and a DC control voltage is applied to the variable reactance element 11a to reduce the resonance frequency of the receiving antenna 11 as described later. I try to control it.
- a DC control voltage is applied to the variable reactance element 11a to move the center frequency (resonance frequency) along the frequency axis, and the applied force also widens the reception frequency band to improve the VSWR characteristics. It is trying to improve.
- ISDB-T Integrated Service Digital Broadcasting-Terrestrial
- analog broadcasting is from 90MHz to 108MHz, 170MHz From 194 MHz to 194 MHz, from 192 MHz power to 222 MHz, frequencies from 470 MHz to 770 MHz are used, and digital broadcasting is specified to use frequencies from 470 MHz to 770 MHz.
- the transmission output (transmission power) of the digital broadcast wave is set lower than the transmission power of the analog broadcast wave so as not to hinder the reception of the analog broadcast wave.
- analog broadcast waves A1 and A2 exist adjacent to the digital broadcast wave D, if the digital broadcast wave D is received, the analog broadcast wave A1 or A2 becomes an interference wave and the digital broadcast wave D cannot be received well. A situation will occur.
- a receiver 12 includes an electronic tuning circuit 13, a signal processing circuit (demodulation means) 14, an error detection unit (error detection means) 15, and a control circuit 16.
- the electronic tuning circuit 13 is a high-frequency circuit.
- the signal processing circuit 14 includes an A / D (analog Z digital) conversion unit 14a and a signal processing unit 14b.
- the control circuit 16 includes a reception frequency control unit 16a, a reception electric field state identification unit (control means) 16b, And a DC control voltage generator (frequency adjusting means) 16c.
- the digital broadcast wave (that is, the RF signal) received by the receiving antenna 11 is adjusted by the RF-AGC 13a and then the first mixer 13b performs the first signal level adjustment. Converted to a 1 intermediate frequency (IF) signal. Then, this first IF signal has its interference wave removed by the SAW filter 13c, and the IF-AGC13d receives the signal again. The issue level is adjusted. The output of IF-AGC 13d is converted to a second IF signal by second mixer 13e, and this second IF signal is input to signal processing circuit 14.
- IF intermediate frequency
- the AZD conversion unit 14a performs AZD conversion on the second IF signal to obtain a digital signal
- the signal processing unit 14b performs predetermined signal processing on the digital signal to generate a video signal and An audio signal (demodulated signal) is obtained, and the video signal is output to the CRT 17 and displayed as a video.
- the audio signal is output to the speaker 18 and output from the speaker 18 as audio.
- the signal processing unit 14 b performs error detection and error correction in signal processing, and the number of errors is given to the error detection unit 15.
- the error detection unit 15 detects the number of errors
- the error detection signal corresponding to the number of errors is given to the reception electric field state identification unit 16b.
- the received electric field condition identification unit 16b is input with an RF level signal and an IF level signal representing the RF level and the IF level from the RF-AGC 13a and the IF-AGC 13d, respectively.
- the received electric field condition identifying unit 16b outputs a received electric field condition signal indicating the received electric field condition to the DC control voltage generating unit 16c according to the error detection signal, the RF level signal, and the IF level signal.
- the reception frequency control unit 16a when the user performs a reception frequency selection operation, the reception frequency control unit 16a selects the reception frequency (that is, the channel) selected according to the reception frequency selection operation.
- the mixers 13b and 13e of 2 are controlled, and a reception frequency selection signal is given to the DC control voltage generator 16c.
- the DC control voltage generator 16c generates a DC control voltage based on the received electric field state signal and the received frequency selection signal, and applies it to the variable reactance element 1la.
- reception frequency control unit 16a when receiving apparatus 10 is turned on and the user selects a desired reception frequency (that is, channel) by a reception frequency selection operation, reception frequency control unit 16a responds to the reception frequency selection operation.
- the first and second mixers 13b and 13e are controlled, and a reception frequency selection signal is given to the DC control voltage generator 16c.
- the DC control voltage generation unit 16c applies a DC control voltage corresponding to the reception frequency selection signal to the variable reactance element 11a, and adjusts the resonance frequency of the reception antenna 11.
- FIG. 5 is a diagram illustrating a reception frequency band of the reception antenna 11 when the resonance frequency is adjusted by a reception frequency selection operation.
- a digital signal that is a desired channel in the reception frequency band is illustrated.
- the analog audio wave AS1 of the analog broadcast wave A1 exists as a disturbing channel (that is, a disturbing wave) on the low frequency side channel.
- the received electric field level of the digital broadcast wave D may be optimum. Since the reception electric field level of the analog broadcast wave A1 (analog audio wave AS 1), which is an interference wave, is high (see Fig. 6 (a)), the reception electric field level of the analog broadcast wave A1 is strong and the reception electric field level is strong. As a result, it operates to lower the received electric field level and consequently lowers the received electric field level of the RF signal (see Fig. 6 (b)).
- the output of the RF-AGC 13a is converted into the first IF signal by the first mixer 13b and given to the SAW filter 13c, where the interference wave component is removed and the digital broadcast wave generation is performed. Minutes are given to IF—AGC13d.
- IF-AGC13d the received electric field level of the digital broadcast wave component becomes too low due to the level suppression of RF-AGC13a, so that it acts to increase the received electric field level of the digital broadcast wave component (Fig. (See 6 (c)).
- the noise component N is unavoidably amplified as shown in Fig. 6 (d), and the C ZN ratio (carrier wave The ratio of noise to noise is reduced! /, The error that occurs when the signal processing circuit 14 performs signal processing increases, and the desired digital broadcast wave cannot be received satisfactorily. Arise.
- the channels adjacent to the desired digital broadcast wave (desired channel) D1 may be digital broadcast waves D2 and D3 (in the illustrated example, the digital broadcast wave D1 If there is an adjacent digital wave D2 on the low frequency side and an adjacent digital wave D3 on the high frequency side) and the digital broadcast wave D1 is received, When it becomes difficult to suppress the noise component, a situation occurs in which the desired digital broadcast wave cannot be received satisfactorily.
- the digital broadcast waves Dl, D2, and D3 shown in FIG. 8 (&) are input to 1 « ⁇ — 80 to 13 &.
- RF-AGC13 In a, when the reception electric field level of the digital broadcast wave Dl is sufficiently high, the reception electric field levels of the adjacent digital broadcast waves (that is, the interference waves here) D2 and D3 are added, so the total reception electric field level is RF-AGC13a. In this way, when the total received electric field level exceeds the saturation electric field level, the noise component N due to the saturation state may be added when performing gain adjustment with the RF-AGC13a. (See Fig. 8 (b)).
- RF The output of the AGC 13a is converted to the first IF signal by the first mixer 13b and given to the SAW filter 13c, where adjacent digital broadcast waves D2 and D3, which are interference wave components, are removed. Then, the digital broadcast wave D1 is given to IF—AGC13d. In IF-AGC13d, gain adjustment is performed, for example, to further reduce the received electric field level of digital broadcast wave D1 (see FIG. 8 (c)). Then, for example, an output having the received electric field level shown in FIG. 8 (d) is transmitted from the IF-AGC 13d.
- the received electric field condition identifying unit 16b controls the DC control voltage generating unit 16c in accordance with the RF level signal, the IF signal, and the error detection signal, as described later. Is adjusted (changed) to change the resonance frequency of the receiving antenna 11 and shift the receiving frequency band along the frequency axis to eliminate the influence of the interference wave.
- received electric field condition identifying unit 16b includes error determining unit 21, first and second comparing units (comparing means) 22 and 23, and electric field determining unit (first and second adjusting means). ) 24 and an output necessity determination unit (output determination means) 25, the error determination unit 21 is connected to the error detection unit 15 described above, and the output necessity determination unit 25 is connected to the DC control voltage generation unit 16c. It is connected
- the first and second comparison units 22 and 23 are respectively provided with an RF level signal and an IF level signal, and the first comparison unit 22 is preset with an RF level signal.
- the first comparison unit 22 is preset with an RF level signal.
- the second comparison unit 23 compares the IF level signal with a preset IF level threshold Th2, and if IF level> Th2, outputs the high level signal as the second comparison result signal, If IF level ⁇ Th2, a low level signal is output as the second comparison result signal.
- first and second comparison result signals are sent to the electric field determination unit 24.
- the electric field determination unit 24 if the first comparison result signal is at a high level (that is, the RF level is at a high level). And: Step ST1), then, it is determined whether or not the second comparison result signal is at a high level (that is, whether or not the IF level is at a high level: Step ST2). Then, the electric field determination unit 24 determines that adjacent interference due to analog radio waves exists if the IF level is low (not high) (first determination: step ST3). On the other hand, if the IF level is high, it is determined that the received strong electric field level is generated by the adjacent digital broadcast wave (second determination: step ST4).
- RF-AGC13a is in a saturated state. Then, in the electric field determination unit 24, when the first determination is made, a first voltage control signal (first frequency adjustment signal) indicating that the resonance frequency is slightly shifted is sent (step ST5), and the second determination is made. Then, a second voltage control signal (second frequency adjustment signal) indicating that the resonance frequency is largely shifted is transmitted (step ST6).
- the error determination unit 21 performs error determination and outputs an error determination signal to the output necessity determination unit 25. give.
- the output necessity determination unit 25 receives the error determination signal, the first or second voltage control signal is supplied to the DC control voltage generation unit 16c. Then, the DC control voltage generator 16c generates a DC control voltage according to the first or second voltage control signal, and applies the DC control voltage to the variable reactance element 1la.
- the resonance frequency fO of the receiving antenna 11 is slightly shifted to the higher frequency side (for example, As shown in FIG. 11, the resonance frequency is shifted to the upper limit of the band of the digital broadcast wave D (the resonance frequency is shifted by the first amount)).
- the voice wave AS1) is in a state of low abundance.
- the analog channel of the analog broadcast wave A2 is used as a disturbing channel (that is, a disturbing wave) in the higher frequency channel. If the audio wave AS2 exists, the resonance frequency fO should be shifted to the low frequency side so that the interference wave (analog audio wave AS2) does not exist in the reception frequency band of the receiving antenna 11. .
- the resonance frequency fO of the receiving antenna 11 is greatly shifted (for example, as shown in FIG.
- the resonance frequency will be greatly shifted until the lower limit of the band of the wave D1 is removed (the second amount resonance frequency larger than the first amount is shifted), resulting in a decrease in the input electric field level of the RF-AGC 13a.
- the generation of noise components due to the saturation of the RF-AGC 13a is suppressed, and reception of the desired digital broadcast wave D1 is improved.
- the RF level obtained from the RF-AGC 13a is IF—Because the resonance frequency of the receiving antenna 11 is shifted according to the IF level obtained from the AGC 13d, the desired digital signal wave can always be received satisfactorily regardless of the presence of interference waves, etc. is there.
- the comparison unit 22 compares the RF level and the RF level threshold value, and the RF level exceeds the RF level threshold value! /.
- the comparison unit 23 compares the IF level and the IF level threshold value, and if the IF level exceeds the IF level threshold value, a second comparison result signal of high level is obtained, and the IF level is the IF level threshold value.
- the second comparison result signal at low level is obtained if the following is true, and if the first comparison result signal is at high level and the second comparison result signal is at low level, the resonance frequency of the receiving antenna 11 is set to the first If the first comparison result signal is at a high level and the second comparison result signal is at a high level, the resonance frequency of the receiving antenna is increased by a second amount that is greater than the first amount. Since shifting is performed, it is possible to prevent poor reception due to RF-AGC saturation, which can be done with force if the influence of interference waves can be eliminated.
- the receiving apparatus is suitable for always receiving a desired broadcast wave satisfactorily by removing the influence of an interference wave.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004354444A JP2006166009A (ja) | 2004-12-07 | 2004-12-07 | 受信装置 |
JP2004-354444 | 2004-12-07 |
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WO2006061930A1 true WO2006061930A1 (ja) | 2006-06-15 |
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PCT/JP2005/016545 WO2006061930A1 (ja) | 2004-12-07 | 2005-09-08 | 受信装置 |
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WO (1) | WO2006061930A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009027636A (ja) * | 2007-07-23 | 2009-02-05 | Tokai Rika Co Ltd | 無線信号の受信装置 |
JP6033667B2 (ja) * | 2012-12-21 | 2016-11-30 | シャープ株式会社 | アンテナ特性チューニングシステム |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61114604A (ja) * | 1984-11-08 | 1986-06-02 | Toyota Motor Corp | 自動車用アンテナ装置 |
JPS63146608A (ja) * | 1986-09-26 | 1988-06-18 | ノーザン・テレコム・リミテツド | 電子制御整合回路 |
JPH01129620A (ja) * | 1987-11-16 | 1989-05-22 | Sanyo Electric Co Ltd | ラジオ受信機 |
JPH0463012A (ja) * | 1989-11-29 | 1992-02-28 | Samsung Electron Co Ltd | ダブルコンバージョンチューナーの自動同調方法 |
JPH077391A (ja) * | 1993-06-21 | 1995-01-10 | Sharp Corp | オートサーチチューニングシステム |
JPH07297623A (ja) * | 1995-03-24 | 1995-11-10 | Seiko Epson Corp | アンテナ回路及び腕装着型無線機 |
JPH09307331A (ja) * | 1996-03-11 | 1997-11-28 | Murata Mfg Co Ltd | 整合回路及びそれを用いたアンテナ装置 |
JP2002232313A (ja) * | 2001-02-07 | 2002-08-16 | Matsushita Electric Ind Co Ltd | アンテナ装置 |
-
2004
- 2004-12-07 JP JP2004354444A patent/JP2006166009A/ja active Pending
-
2005
- 2005-09-08 WO PCT/JP2005/016545 patent/WO2006061930A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61114604A (ja) * | 1984-11-08 | 1986-06-02 | Toyota Motor Corp | 自動車用アンテナ装置 |
JPS63146608A (ja) * | 1986-09-26 | 1988-06-18 | ノーザン・テレコム・リミテツド | 電子制御整合回路 |
JPH01129620A (ja) * | 1987-11-16 | 1989-05-22 | Sanyo Electric Co Ltd | ラジオ受信機 |
JPH0463012A (ja) * | 1989-11-29 | 1992-02-28 | Samsung Electron Co Ltd | ダブルコンバージョンチューナーの自動同調方法 |
JPH077391A (ja) * | 1993-06-21 | 1995-01-10 | Sharp Corp | オートサーチチューニングシステム |
JPH07297623A (ja) * | 1995-03-24 | 1995-11-10 | Seiko Epson Corp | アンテナ回路及び腕装着型無線機 |
JPH09307331A (ja) * | 1996-03-11 | 1997-11-28 | Murata Mfg Co Ltd | 整合回路及びそれを用いたアンテナ装置 |
JP2002232313A (ja) * | 2001-02-07 | 2002-08-16 | Matsushita Electric Ind Co Ltd | アンテナ装置 |
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JP2006166009A (ja) | 2006-06-22 |
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