WO2007116931A1 - Dispositif de reception et dispositif electronique utilisant celui-ci - Google Patents

Dispositif de reception et dispositif electronique utilisant celui-ci Download PDF

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Publication number
WO2007116931A1
WO2007116931A1 PCT/JP2007/057645 JP2007057645W WO2007116931A1 WO 2007116931 A1 WO2007116931 A1 WO 2007116931A1 JP 2007057645 W JP2007057645 W JP 2007057645W WO 2007116931 A1 WO2007116931 A1 WO 2007116931A1
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WO
WIPO (PCT)
Prior art keywords
band
pass frequency
variable filter
control unit
data
Prior art date
Application number
PCT/JP2007/057645
Other languages
English (en)
Japanese (ja)
Inventor
Yoshitaka Nagatomi
Yasunobu Tsukio
Original Assignee
Panasonic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Publication of WO2007116931A1 publication Critical patent/WO2007116931A1/fr

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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
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Definitions

  • the present invention relates to a receiving apparatus and an electronic apparatus such as a portable terminal and a car-mounted television using the receiving apparatus.
  • FIG. 4 is a block diagram of a conventional receiving apparatus 1.
  • the receiving device 1 includes a band-variable filter 3 that passes a signal in a desired band among signals received by the antenna 2, a receiver circuit 4 that converts a signal output from the band-variable filter 3 force S into an intermediate frequency, and a receiver circuit 4 And a demodulating circuit 5 for demodulating the signal output from the.
  • the receiving device 1 includes a band control unit 6 that controls the pass frequency band of the band-variable filter 3 according to the channel selected by the user. For example, when the first channel is selected, the band control unit 6 determines the pass frequency band of the band variable filter 3 as the first channel and outputs the signal of the first channel to the receiving circuit 4.
  • the receiving apparatus when an interference wave is present in the channel selected by the user and the frequency band in the vicinity thereof, the quality of the signal input to the receiving circuit is degraded.
  • a receiving device includes a variable band filter having a variable pass frequency band, a control unit that sets the pass frequency band of the variable band filter to a plurality of pass frequency bands, and a plurality of passes output by the variable band filter. And a detector that outputs a plurality of data indicating the quality of the signal in the frequency band. The control unit determines the pass frequency band of the band variable filter based on the plurality of data.
  • the receiving circuit can receive a signal of good quality.
  • FIG. 1 is a block diagram of an electronic device in an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a band-variable filter of the receiving device of the electronic device in the embodiment.
  • FIG. 3A shows a table stored in the receiving apparatus in the embodiment.
  • FIG. 3B shows a table stored in the receiving apparatus in the embodiment.
  • FIG. 4 is a circuit diagram of a conventional receiving apparatus.
  • FIG. 1 is a block diagram of electronic device 1001 according to the embodiment of the present invention.
  • An electronic device 1001 such as a portable terminal or an on-vehicle TV has a receiving device 7.
  • the receiving device 7 includes a variable band filter 9 connected to the antenna 8, a receiving circuit 10 that converts a signal output from the variable band filter 9 into an intermediate frequency signal, and a demodulation that demodulates the signal output from the receiving circuit 10.
  • Circuit 11 The electronic device 1001 further includes a signal processing circuit 51 that processes a signal output from the demodulation circuit 11 and a display unit 52 that displays a signal output from the signal processing circuit 51.
  • the antenna 8 is, for example, an antenna for a very high frequency band, and receives a radio wave of about 770 MHz with a power of about 470 MHz.
  • a UHF band radio wave is composed of frequency bands of a plurality of channels, and the frequency band of each channel is composed of a plurality of frequency bands of, for example, 13 segments.
  • FIG. 2 is a circuit diagram of the variable band filter 9.
  • the band variable filter 9 has a variable pass frequency band that allows a predetermined segment in the frequency band corresponding to the channel selected by the user to pass.
  • the variable bandwidth filter 9 is connected in parallel with the input variable capacitor 12 connected in series to the antenna 8, the output variable capacitor 13 connected between the input variable capacitor 12 and the receiving circuit 10, and the resonant variable capacitor 14.
  • the fixed inductor 15 is made up of.
  • Input variable capacitor 12 and output variable capacitor 13 are connected at connection point 14A.
  • Resonance variable capacitor 14 is connected Connected between connecting point 14A and ground 14B.
  • the output variable capacitor 13 is connected to the input variable capacitor 12 in series.
  • the input variable capacitor 12, the output variable capacitor 13, and the resonance variable capacitor 14 are, for example, varicap diodes.
  • the receiving circuit 10 is composed of, for example, a high-frequency integrated circuit, and a high-frequency amplifying unit 16 that amplifies a signal output from the band variable filter 9 and a signal output from the high-frequency amplifying unit 16 Is converted to an intermediate frequency signal, a filter 18 that removes noise from the signal output from the mixing unit 17, and an intermediate frequency amplifier 19 that amplifies the signal output from the filter 18.
  • the receiving circuit 10 outputs a signal output from the intermediate frequency amplifier 19.
  • the demodulator 54 of the demodulator circuit 11 demodulates the intermediate frequency signal output from the intermediate frequency amplifier 19.
  • the signal processing circuit 51 processes the signal demodulated by the demodulator 54 and outputs a video signal and an audio signal.
  • the display unit 52 displays and outputs video signals and audio signals.
  • the demodulation circuit 11 is composed of, for example, an orthogonal frequency division multiplexing integrated circuit, a detection unit 20 that detects the quality of a signal output from the reception circuit 10, and a band-variable filter based on the quality detected by the detection unit 20
  • the control unit 21 controls nine passbands, and a storage unit 22 connected to the control unit 21.
  • FIGS. 3A and 3B show tables stored in the storage unit 22 and show the relationship between the pass frequency band of the band-variable filter 9 and the voltage Vt supplied to the band-variable filter 9.
  • Figure 3A shows the initial state of the table shown in Figure 3B.
  • the control unit 21 sets the voltage Vt supplied to the band variable filter 9 to 0. IV.
  • the pass frequency band of the band variable filter 9 is set to the pass frequency band B1 having a center frequency lower than the predetermined frequency band of the seventh segment within the frequency band corresponding to 14 channels.
  • the pass frequency band B1 has a signal attenuation force at the center frequency of the pass frequency band B1, and further has a bandwidth that attenuates, for example, 3 dB. Includes the frequency band of a seventh segment.
  • the variable band filter 9 passes the signal in the pass frequency band B 1 out of the signal sent from the antenna 8.
  • the receiving circuit 10 receives the signal of the pass frequency band B1 output from the band variable filter 9.
  • the detection unit 20 detects a carrier Z noise (C / N) ratio as data indicating the quality of the signal in the pass frequency band B 1.
  • C / N carrier Z noise
  • the control unit 21 determines that the voltage Vt value 0.IV output to the band-variable filter 9 and 40 dB of the CZN ratio value are the quality of the signal in the pass frequency band B1. Is stored in the storage unit 22 as data indicating.
  • control unit 21 sets the voltage Vt supplied to the band variable filter 9 to 0.11V.
  • the pass frequency band of the band variable filter 9 is set to the pass frequency band B2 having a center frequency within the frequency band of the seventh segment within the frequency band corresponding to 14 channels.
  • the pass frequency band B2 has a bandwidth that further attenuates, for example, 3 dB from the signal attenuation amount at the center frequency of the pass frequency band B2.
  • the band variable filter 9 passes the signal in the pass frequency band B2 among the signals transmitted from the antenna 8.
  • the receiving circuit 10 receives the signal of the pass frequency band B2 output from the band variable filter 9.
  • the detection unit 20 detects a CZN ratio indicating the quality of the signal in the pass frequency band B2. When the detected C ZN ratio is 60 dB, the control unit 21 determines that the voltage Vt output to the variable band filter 9 is 0.1V and the CZN ratio value 60 dB is Stored in the storage unit 22 as data indicating quality.
  • the control unit 21 sets the voltage Vt supplied to the band variable filter 9 to 0.12V.
  • the pass frequency band of the band-variable filter 9 is set to the pass frequency band B3 having a center frequency higher than the frequency band of the seventh segment within the frequency band corresponding to 14 channels.
  • the pass frequency band B3 has a bandwidth that further attenuates, for example, 3 dB from the signal attenuation at the center frequency of the pass frequency band B3, and includes a frequency band of a seventh segment that is a predetermined frequency band.
  • the variable band filter 9 passes the signal of the pass frequency band B3 among the signals transmitted from the antenna 8.
  • the receiving circuit 10 receives the signal in the pass frequency band B3 output from the band variable filter 9.
  • the detection unit 20 detects a CZN ratio indicating the quality of the signal in the pass frequency band B3.
  • the control unit 21 determines that the voltage Vt output to the band-variable filter 9 is 0.12 V
  • the N ratio value 50 dB is stored in the storage unit 22 as data indicating the quality of the signal in the pass frequency band B3. In this manner, the control unit 21 stores data indicating the quality of signals in the plurality of pass frequency bands B1 to B3 in the storage unit 22, and stores the table shown in FIG. 3B.
  • control unit 21 determines the voltage Vt supplied to the band variable filter 9 to a value 0.1 IV having the largest CZN ratio,
  • the pass frequency band of variable filter 9 is determined as pass frequency band B2.
  • control unit 21 determines the pass frequency band of the band-variable filter 9 in the frequency band having the best quality among the frequency bands of the channel selected by the user. Can receive the signal.
  • the detection unit 20 may detect the bit error rate (BER) of the signal output from the band variable filter 9 as data indicating the quality of the signal.
  • the control unit 21 determines the pass frequency band of the band variable filter 9 based on the BER of the signals of the plurality of pass frequency bands B1 to B3 output by the band variable filter 9 detected by the detection unit 20. .
  • the detection unit 20 can detect the quality of the signal more accurately, and can improve the quality of the signal received by the reception circuit 10.
  • the data indicating the quality of the signal detected by the detection unit 20 is CZN ratio
  • the signal quality by the detection unit 20 can be detected in a time shorter than the BER.
  • the control unit 21 may determine the pass frequency band of the band variable filter 9 as described above at predetermined time intervals. As a result, the receiving circuit 10 can continuously receive a high-quality signal.
  • the electronic device 1001 further includes a battery 53 that drives the receiving device 7, the signal processing circuit 51, and the display unit 52.
  • the control unit 21 may detect the remaining amount of the battery 53. When the remaining amount of the battery 53 is greater than a predetermined value, the control unit 21 may determine the pass frequency band of the band variable filter 9 as described above. The control unit 21 does not perform the operation of determining the pass frequency band of the band variable filter 9 when the remaining amount of the battery 53 is equal to or less than the predetermined value. Thereby, it is possible to prevent the control unit 21 from consuming the battery 53.
  • the control unit 21 reduces the data indicating the quality of the signal detected by the detection unit 20 to a predetermined level or less.
  • the pass frequency band of the band-variable filter 9 may be determined when the quality is lower than that of the predetermined bell.
  • the reception circuit 10 can continuously receive a signal of good quality while suppressing power consumption.
  • the control unit 21 may be V provided in the signal processing circuit 51 connected to the output side of the demodulation circuit 11. Since the processing speed of the signal processing circuit 51 is generally higher than the processing speed of the demodulation circuit 11, it is possible to shorten the time for the control unit 21 to determine the pass frequency band of the band-variable filter 9.
  • the receiving circuit can receive signals of good quality and is useful for electronic devices such as portable terminals and automobile-mounted televisions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

L'invention concerne un dispositif de réception comportant un filtre à bande variable présentant une bande variable de fréquences passantes, une section de commande permettant de régler la bande de fréquences passantes du filtre à bande variable sur une pluralité de bandes de fréquences passantes, ainsi qu'une section de détection permettant de fournir respectivement en sortie des données indiquant des qualités de signaux des bandes de fréquences passantes en sortie du filtre à bande variable. La section de commande détermine la bande de fréquences passantes du filtre à bande variable sur la base des données. Dans le dispositif de réception,un circuit de réception peut recevoir des signaux de haute qualité.
PCT/JP2007/057645 2006-04-07 2007-04-05 Dispositif de reception et dispositif electronique utilisant celui-ci WO2007116931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006105948A JP2007281909A (ja) 2006-04-07 2006-04-07 受信装置とこれを用いた電子機器
JP2006-105948 2006-04-07

Publications (1)

Publication Number Publication Date
WO2007116931A1 true WO2007116931A1 (fr) 2007-10-18

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JP (1) JP2007281909A (fr)
WO (1) WO2007116931A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013005264A1 (ja) * 2011-07-07 2015-02-23 富士通株式会社 可変フィルタ装置および通信装置
KR20140019467A (ko) * 2011-07-07 2014-02-14 후지쯔 가부시끼가이샤 가변 필터 장치 및 통신 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373711A (ja) * 1986-09-16 1988-04-04 Pioneer Electronic Corp 周波数シンセサイザチユ−ナ
JPH11186923A (ja) * 1997-12-19 1999-07-09 Sony Corp 携帯通信装置および受信方法
JP2001016146A (ja) * 1999-06-30 2001-01-19 Nec Corp ディジタル多重受信装置及び受信方法
JP2006094150A (ja) * 2004-09-24 2006-04-06 Sanyo Electric Co Ltd アンテナ制御装置、アンテナ制御方法およびデジタル受信装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373711A (ja) * 1986-09-16 1988-04-04 Pioneer Electronic Corp 周波数シンセサイザチユ−ナ
JPH11186923A (ja) * 1997-12-19 1999-07-09 Sony Corp 携帯通信装置および受信方法
JP2001016146A (ja) * 1999-06-30 2001-01-19 Nec Corp ディジタル多重受信装置及び受信方法
JP2006094150A (ja) * 2004-09-24 2006-04-06 Sanyo Electric Co Ltd アンテナ制御装置、アンテナ制御方法およびデジタル受信装置

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JP2007281909A (ja) 2007-10-25

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