WO2000014888A1 - Procede et dispositif pour la reception de signal module en frequence - Google Patents
Procede et dispositif pour la reception de signal module en frequence Download PDFInfo
- Publication number
- WO2000014888A1 WO2000014888A1 PCT/JP1999/004756 JP9904756W WO0014888A1 WO 2000014888 A1 WO2000014888 A1 WO 2000014888A1 JP 9904756 W JP9904756 W JP 9904756W WO 0014888 A1 WO0014888 A1 WO 0014888A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- signal
- demodulation
- level
- processing
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
- B61L1/18—Railway track circuits
- B61L1/181—Details
- B61L1/188—Use of coded current
Definitions
- the present invention relates to a signal receiving apparatus using demodulation processing of a frequency modulation signal having amplitude dependency, and particularly to a train detecting apparatus using a track circuit in a railway.
- the reception level is affected by differences in the length of each track circuit and the surrounding environment, the level when no train is present is also different, and the effect of the short-circuit caused by train wheels on the reception level is also different.
- any threshold value must be settable for each orbit fixation.
- the reception level value is affected by all signal components in the frequency band determined by the filter characteristics, if there is a power S such as another device using a nearby frequency band, the signal used by these devices as noise It is difficult to eliminate the effects.
- the effect of such noise is large, for example, the received signal level becomes larger than the train detection level due to the sound even though the train is within the range of the target track circuit. In such a case, there is a possibility that the judgment of the presence or absence of a train is erroneously made.
- the demodulation process is performed by the receiver in order to perform demodulation processing. It is necessary to use an amplitude-dependent demodulation method that determines whether or not the demodulation can be performed. As a demodulation processing method that satisfies such conditions, for example, a method using PLL processing can be considered.
- the amplitude of the input signal is preset at the time of design. If the input amplitude decreases, the frequency range that can be synchronized decreases, and if the modulation range of this frequency range modulation signal cannot be satisfied, the synchronization condition will be satisfied. It is shown qualitatively that you cannot do it. From this, the demodulation lower limit level, which is the received signal level when demodulation cannot be performed because the synchronization conditions are not satisfied, can be obtained by calculation, and the PLL processing is designed so that the train detection level and demodulation lower limit level match. It is.
- An object of the present invention is to improve the productivity of a train detection device that is more resistant to noise.
- the purpose of the previous speech is to perform demodulation processing with amplitude dependence on the demodulation processing, and to apply the demodulation processing as a method of arbitrarily setting the train detection level, which is the threshold of the signal level for train judgment.
- gain processing to amplify the signal amplitude
- limit to limit the amplitude of the output signal of the gain process to a constant value equal to the design input amplitude of the demodulation process
- harmonics generated by the limit process This is achieved by performing filter processing to set the lower limit of the signal level that can be demodulated to the same value as the train detection level by changing the gain value.
- the filter processing is based on the sampling frequency power of the filter processing.
- the frequency is set to be a multiple of an odd fraction of the sampling frequency
- the pass band of the power filter is set to a value wider than the signal band required for demodulation
- the pass band is set to the sampling frequency.
- FIG. 1 is a diagram showing a configuration of a train detection device in an embodiment of the present invention.
- FIG. 2 is a diagram showing a relationship between a processing configuration of a receiving device and a received signal level in the embodiment of the present invention.
- FIG. 3 is a diagram showing a relationship between an input level of a limiter process and an input amplitude of a PLL process of a output level with respect to a design value in the embodiment of the present invention.
- FIG. 4 is a diagram showing a relationship between a train detection level and demodulation availability in the embodiment of the present invention.
- FIG. 5 is a diagram showing a frequency characteristic of the fill process in the embodiment of the present invention.
- FIG. 6 is a diagram showing the relationship between the frequency characteristic of the filtering process and the odd-order harmonic in the embodiment of the present invention.
- FIG. 7 shows an embodiment in which the present invention is applied to a plurality of track circuits.
- Fig. 8 shows the device configuration when applied to a water quality detection device in a water tank.
- Fig. 1 shows the system configuration using this method.
- the track on which the train travels consists of one or more track circuits.
- Each track circuit is connected at one end to a transmission device 2 for transmitting a train detection signal, which is a frequency-modulated signal, and at the other end, to a reception device 3 for receiving the train detection signal.
- the train detecting device 1 is connected to the transmitting device and the receiving device via a transmission line such as a network.
- the track will be short-circuited by the axle of the train, and the receiving signal level of the train detection signal received by the receiver will be such that the train does not exist within the range of the track circuit! : Then it goes to a lower level.
- the received signal level serving as a threshold when the received signal level is reduced and it is determined that there is a train is called a train detection level.
- PLL processing is used as a method to arbitrarily set the demodulation lower limit level, which is the lower limit that can be demodulated according to the train detection level, for each track.
- processing is performed in the order of the gain processing section, the limit processing section, and the harmonic elimination filter processing section.
- the gain processing unit performs signal amplification to match the train detection level with the demodulation lower limit level, and receives the gain required for signal amplification from the gain information holding unit as gain information.
- the limiter limits the amplitude according to the amplification factor so that the PLL processor does not receive a negative input.
- the harmonic components generated in the limit processing are calculated.
- Train detection is performed in the following procedure.
- the transmission information creation unit of the train detection device creates transmission information and transmits it to the transmission device via the network. This transmission information is also sent to the reception information collation unit in the train detection device.
- the transmitting device performs frequency modulation processing on the transmission information received via the network.
- the control section converts the signal into a train detection signal and sends it to the track circuit.
- the receiver 3 first removes noise included in the received signal by the noise removal filter unit 31 from the train detection signal received via the track circuit. Next, using the gain information from the gain information holding unit 33, the gain processing unit 32 amplifies the received signal. Next, the limiter 34 limits the amplitude of the received signal. Next, the harmonic component removal filter section 35 removes the harmonic components included in the train detection signal. Next, the modulation component of the train detection signal received by the PLL processing unit 36 is detected. Finally, the reception information creation section 37 creates reception information from the modulated component and transmits the information to the train detection device via a transmission path such as a network.
- the train detection device compares the transmitted information with the received information in the received information matching unit to detect the presence or absence of a train within the range of the track circuit, gives the detection result to the display unit and displays it, and also displays the signal in the signal control unit. To control the signal.
- Fig. 2 shows a level diagram of the relationship between the received signal level and the demodulation lower limit level.
- the procedure for matching the train detection level with the demodulation lower limit level is described. This corresponds to the characteristic (1) in Fig. 2. Since the characteristics of the PLL processing unit depend on the amplitude of the received signal that is the input signal to the PLL processing, the amplitude of the input signal is determined first, and the PLL processing unit is designed to derive the demodulation lower limit level. For example, when the amplitude of the input signal is designed to be 1.0, the demodulation lower limit level is 0.316. Here, if the design value 1.0 of the amplitude of the input signal is set to 0 [dB], the PLL processing can be demodulated at a signal level of more than 1 10 [dB].
- the gain processing unit first sets the amplification factor for matching the lower detection level of the PLL processing with the train detection level for each track circuit, and holds the gain information in the gain information holding unit as gain information.
- the reception level when there is no train power within the range of the track circuit is 3.16 (corresponding to +10 [dB])
- the amplitude at the train detection level is 0.0316 (corresponding to -30 [dB]).
- the demodulation lower limit level is 0.316 (-10 [dB])
- 10.0 (equivalent to +20 [dB]) should be set as the gain information.
- the received signal added with the gain by the gain processor
- the amplitude of the input signal to the PLL processing unit is set to a value that matches the amplitude of the PLL processing unit when it was designed. For example, if the amplitude at the train detection level is 0.0316 ( ⁇ 30 [dB]), the demodulation lower limit level is 0.316 (—10 [dB]), and the amplification factor is 10.0 (+20 [dB]), the range of the track circuit When the reception level is 3.16 (+10 [dB]) when there is no train inside, the amplitude of the output signal of the gain processing unit is 3.16 (+30 [dB]).
- the limiter sets the value exceeding 1.0 (0 [dB]), which is the set value of the input amplitude of the PLL process, to 1.0 (0 [dB]). Avoid level input to the processing section. For this reason
- the relationship between the input amplitude and the output amplitude of the evening processing unit is such that the input amplitude and the output amplitude work in the range below the amplitude at the time of the design of the PLL processing unit, and exceed the amplitude at the time of the design of the PLL processing unit. Then, the output amplitude becomes a value equal to the amplitude at the time of designing the PLL processing unit.
- Fig. 3 shows this relationship.
- the harmonic removal filter section removes harmonics generated in the limiter section.
- the reception level exceeds the designed amplitude of the PLL processing section
- the output signal of the limiting processing section is in a state close to a rectangular wave, and contains a harmonic component.
- the harmonic component will affect the PLL processor as a noise component and affect the characteristics of the PLL processor. Can not be satisfied. Therefore, the harmonic component is removed by the harmonic removal filter unit so that the PLL processing unit performs the processing according to the design.
- the PLL processing unit can receive an input signal in which the demodulation lower limit level and the train detection level match.
- the amplitude at the train detection level is 0.0316 (-30 [dB])
- the gain is 10.0 (+20 [dB])
- the input amplitude is set when designing the PLL processing unit.
- the case where the fixed value is 1.0 (0 [dB]) and the demodulation lower limit level is 0.316 (–10 [dB]) are described below.
- the reception level is 0.0177 (-35 [dB]).
- the characteristics at this time correspond to (2) in Fig. 2.
- the reception level is lower than the train detection level 0.0316.
- the output of the gain processing unit is 0.177 ( ⁇ 15 [dB]), which is smaller than 0.316 ( ⁇ 10 [dB]).
- the output of the gain processor is not affected. For this reason, the output of the limiter does not have any harmonic components, and is not affected by the harmonic filter filter. As a result, a signal of a level of 0.177 ( ⁇ 15 [dB]), which is a signal of a level smaller than 0.316 ( ⁇ 10 [dB]), is input to the PLL processing unit.
- the demodulation cannot be performed because the lower-limit level of demodulation in the PLL processing section is 0.316 (–10 [dB]).
- signals with an amplitude smaller than the train detection level are not demodulated.
- the reception information creation unit does not create reception information
- the transmission information does not match the reception information in the reception information collation unit of the train detection device, and it is possible to detect the presence of the train in the track circuit.
- the reception level is 3.16 (+10 [dB]).
- the characteristics at this time correspond to (3) in Fig. 2.
- the reception level is greater than the train detection level of 0.0316 (—30 [dB]).
- the output of the gain processing unit is 3.16 (+30 [dB]), which is a value larger than 0.316 (-10 [dB]).
- the maximum value of the output amplitude of the limiter processing is 1.0 (0 [dB]), which is the same value as the set value of the input amplitude of the PLL processing unit.
- the output signal of the limiter becomes a signal similar to a square wave, and the amplitude is 1.0 (0 [dB]). Therefore, the output of the limiter processing unit contains a harmonic component. However, since harmonic components are removed by the harmonic reject filter, the output of the harmonic reject filter is removed. The force signal is a signal from which harmonics have been removed, and the amplitude is the same as the output signal of the limiter, and is 1.0 (0 [dB]) at the maximum. As a result, a signal having a value greater than width 0 ⁇ 316 ( ⁇ 10 [dB]) and smaller than 1.0 (0 [dB]) is input to the PLL processing unit.
- the demodulation lower limit level of the PLL processing unit is 0.316 (-10 [dB]), and the input value of the PLL processing unit is 1.0 (0 [dB]). I can do it. In other words, signals with an amplitude greater than the train detection level are demodulated. For this reason, the reception information creation unit matches the transmission information with the reception information in the reception information comparison unit of the train detection device to create the reception information. From this, it can be detected that no train exists in the track circuit.
- the harmonic filter processor removes the harmonic components of the input signal generated in the limit processor, it is necessary to reduce the effects of odd-order harmonics, which are mainly rectangular wave components.
- the input frequency value is set to a multiple of the odd-order fraction of the sampling frequency.
- the pass band shall be set to a band smaller than one odd order of the sampling frequency centered on the input frequency, and the ffiih band shall be all bands other than one odd part of the sampling frequency centered on the input frequency.
- the band required for demodulation is set to ⁇ 300 [Hz] around the input frequency
- the pass band of the filter is set to 2/7 of the sampling frequency.
- Figure 5 shows the filter characteristics.
- the sampling frequency is 7 [kHz] and the center frequency of the passband is 2 [kHz].
- the passband width must be smaller than one-seventh of the sampling frequency, but the band required for demodulation is the ⁇ 300 [Hz] band centered on the input frequency 2 [kHz]. The width does not impair the bandwidth required for demodulation.
- the pass band is a band of ⁇ 300 [Hz] centered on 2 [kHz].
- the stop band is all bands except for 1/7 of the sampling frequency centered on the input frequency 2 [kHz]
- all bands except the bandwidth of 1 [kHz] centered on 2 [kHz] are used.
- a frequency band equal to or lower than 1.5 [kHz] and a frequency band equal to or higher than 2.5 [kHz] are defined as ⁇ : band.
- ⁇ band.
- the passband characteristic is 5.0 [kHz] obtained by folding the band of ⁇ 300 [Hz] or less centered on the passband 2.0 [kHz] at 3.5 [kHz], which is half of the sampling frequency.
- the band is ⁇ 300 [Hz] or less from the center.
- the stopband characteristics also turn around in the same way, so that the sampling frequency ranges from 3.5 [kHz] to 4.5 [kHz], which is half the sampling frequency, and from 5.5 [kHz] to the sampling frequency 7 [kHz]. Range is considerable.
- harmonic components mainly exist at odd multiples of the input frequency.
- the harmonics are in odd multiples of the two-sevenths of the sampling frequency. The following describes the band up to the 15th harmonic.
- the first harmonic is the same frequency as the input frequency, and is a frequency component to be processed in the PLL processing. For this reason, it corresponds to the pass band in the main filter processing.
- This frequency component exists in the range of ⁇ 300 [Hz] around 2 [kHz], which is the same as the input frequency, and corresponds to two-sevenths of the sampling frequency.
- the third harmonic exists in a range of 300 [Hz] centered on 6 [kHz], which is three times the input frequency 2 [kHz], which is 1 [kHz] when the sampling frequency is 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] with the center at the center. This corresponds to a band that is one seventh of the sampling frequency.
- the fifth harmonic exists in the range of ⁇ 300 [Hz] centered on 10 [kHz], which is five times the input frequency 2 [kHz], and this is 3 [kHz] when the sampling frequency is 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] with the center at the center. This corresponds to a band that is three-seventh the sampling frequency.
- the seventh harmonic is 14 [kHz], which is 7 times the input frequency 2 [kHz]. Is in the range of 300 [Hz] around the center, which is equivalent to a range of ⁇ 300 [Hz] around 0 [kHz] at the sampling frequency of 7 [kHz]. For this reason, it corresponds to a band of 0/7 of the sampling frequency.
- the ninth harmonic exists in a range of ⁇ 300 [Hz] centered at 18 [kHz], which is nine times the input frequency 2 [kHz], and this is 3 [kHz] when the sampling frequency is 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] with the center at the center. This corresponds to a band that is three-seventh the sampling frequency.
- the eleventh harmonic exists in a range of ⁇ 300 [Hz] centered at 22 [kHz], which is eleven times the input frequency 2 [kHz], which is 1 at a sampling frequency of 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] centered on [kHz]. This is equivalent to one-seventh of the sampling frequency.
- the 13th harmonic exists in the range of 300 [Hz] centered on 26 [kHz], which is 13 times the input frequency 2 [kHz], and this is 2 [kHz] when the sampling frequency is 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] with the center at the center. This corresponds to a band that is two-seventh the sampling frequency.
- the 15th harmonic exists in the range of 300 [Hz] centered on 30 [kHz], which is 15 times the input frequency 2 [kHz], which is 2 [kHz] when the sampling frequency is 7 [kHz]. This is equivalent to being in the range of ⁇ 300 [Hz] with the center at the center. This corresponds to a band that is two-seventh the sampling frequency.
- Figure 6 shows the relationship between harmonics and fill characteristics. Odd-order harmonics that match the passband are the 13th and higher harmonics.
- the input signal is determined by Fourier transform as a perfect rectangular wave.
- the level of the 13th harmonic with respect to the 1st harmonic is Assuming that the first harmonic is 0 [dB], the first and third harmonics can be found to be about -24 [dB]. For example, if the attenuation of the pass band of the filter process is 0 [dB] and the output amplitude of the limiter is 1.0 at the maximum, the amplitude of the first harmonic component is 1.0. The components of the first and third harmonics are converted into amplitudes and become 0.07 or less. From this, the output amplitude of the fill process becomes about 1.07 at the maximum due to the influence of the first and third harmonics, and the harmonics can be effectively reduced.
- Fig. 8 shows the device configuration when applied to a water quality detection device in 7 tanks.
- a light emitting device and a light receiving device are installed in a pair in a water tank.
- the light emitting device is connected to the transmitting device, and the device is connected to the receiving device.
- the transmitting device and the receiving device are connected to the water quality detection device via the network.
- the water quality detection device warns the display unit when the light intensity of the light emitting device is attenuated by the rate of the water quality and falls below a certain level of the light intensity received by the light receiving device. Display and instruct water quality control unit to improve water quality.
- the water quality detection threshold varies depending on the installation distance between the light-emitting device and the light-receiving device, and must be determined individually for each light-emitting device and light-receiving device pair.
- the threshold value for water quality detection can be set to any value by setting the threshold for water quality detection as gain information for each receiver by applying this method to the receiver. It is. Industrial applicability
- the apparatus according to the present invention is applicable to railway signal control as a train detection apparatus having high resistance to noise and high productivity.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99940620A EP1115213A4 (en) | 1998-09-03 | 1999-09-02 | METHOD AND DEVICE FOR RECEIVING A FREQUENCY-MODULATED SIGNAL |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/249283 | 1998-09-03 | ||
JP24928398A JP3867412B2 (ja) | 1998-09-03 | 1998-09-03 | 周波数変調信号受信方法及び装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000014888A1 true WO2000014888A1 (fr) | 2000-03-16 |
Family
ID=17190671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/004756 WO2000014888A1 (fr) | 1998-09-03 | 1999-09-02 | Procede et dispositif pour la reception de signal module en frequence |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1115213A4 (ja) |
JP (1) | JP3867412B2 (ja) |
KR (1) | KR100402089B1 (ja) |
CN (1) | CN1317170A (ja) |
WO (1) | WO2000014888A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011074094A1 (ja) * | 2009-12-17 | 2011-06-23 | 三菱電機株式会社 | 伝送システム |
RU2628452C1 (ru) * | 2016-07-07 | 2017-08-16 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Устройство для определения параметров ленточных сверхпроводников |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5057763A (ja) * | 1973-09-21 | 1975-05-20 | ||
JPS5118122B1 (ja) * | 1970-07-09 | 1976-06-08 | ||
JPS54124956A (en) * | 1978-03-22 | 1979-09-28 | Noboru Denki Seisakushiyo Kk | Zone division limiter |
JPS57113381A (en) * | 1980-12-31 | 1982-07-14 | Nippon Signal Co Ltd:The | Vehicle detector |
JPS60138441A (ja) * | 1983-12-27 | 1985-07-23 | Toshiba Corp | 水質計器の自己診断装置 |
JPH01212001A (ja) * | 1988-02-18 | 1989-08-25 | Matsushita Electric Ind Co Ltd | 誘電体フィルタ |
JPH0692232A (ja) * | 1992-09-10 | 1994-04-05 | Kyosan Electric Mfg Co Ltd | 無絶縁軌道回路装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1149918A (en) * | 1979-12-18 | 1983-07-12 | Mario Poggio | Frequency modulated railroad track circuit |
GB8906997D0 (en) * | 1989-03-28 | 1989-05-10 | Secr Defence | Fm interference reduction |
-
1998
- 1998-09-03 JP JP24928398A patent/JP3867412B2/ja not_active Expired - Fee Related
-
1999
- 1999-09-02 EP EP99940620A patent/EP1115213A4/en not_active Withdrawn
- 1999-09-02 CN CN99810582A patent/CN1317170A/zh active Pending
- 1999-09-02 WO PCT/JP1999/004756 patent/WO2000014888A1/ja not_active Application Discontinuation
- 1999-09-02 KR KR10-2001-7002724A patent/KR100402089B1/ko not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5118122B1 (ja) * | 1970-07-09 | 1976-06-08 | ||
JPS5057763A (ja) * | 1973-09-21 | 1975-05-20 | ||
JPS54124956A (en) * | 1978-03-22 | 1979-09-28 | Noboru Denki Seisakushiyo Kk | Zone division limiter |
JPS57113381A (en) * | 1980-12-31 | 1982-07-14 | Nippon Signal Co Ltd:The | Vehicle detector |
JPS60138441A (ja) * | 1983-12-27 | 1985-07-23 | Toshiba Corp | 水質計器の自己診断装置 |
JPH01212001A (ja) * | 1988-02-18 | 1989-08-25 | Matsushita Electric Ind Co Ltd | 誘電体フィルタ |
JPH0692232A (ja) * | 1992-09-10 | 1994-04-05 | Kyosan Electric Mfg Co Ltd | 無絶縁軌道回路装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1115213A4 * |
Also Published As
Publication number | Publication date |
---|---|
KR20010074917A (ko) | 2001-08-09 |
CN1317170A (zh) | 2001-10-10 |
EP1115213A1 (en) | 2001-07-11 |
JP2000078040A (ja) | 2000-03-14 |
KR100402089B1 (ko) | 2003-10-17 |
EP1115213A4 (en) | 2003-07-09 |
JP3867412B2 (ja) | 2007-01-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR890702357A (ko) | 무선 원격 스피커 시스템 | |
JPWO2007000860A1 (ja) | 放送受信装置、妨害検出装置および妨害検出方法 | |
WO2007000882A1 (ja) | 妨害波検出装置および妨害波除去装置 | |
US9119004B2 (en) | Wireless device | |
JPH0884084A (ja) | Am受信機用自動利得制御オーバーシュート制限装置 | |
JP3992521B2 (ja) | 隣接妨害検出装置および方法、ならびにその方法を利用可能な放送受信装置 | |
WO2000014888A1 (fr) | Procede et dispositif pour la reception de signal module en frequence | |
JP4813189B2 (ja) | 高調波抑制回路 | |
JP4132534B2 (ja) | 自動列車制御装置の地上装置 | |
US7970091B2 (en) | Method for reducing spectral regrowth in a spectrally efficient digital modulation scheme | |
JP2008535295A (ja) | クロック制御されるシステムの高周波放射を減衰する方法 | |
KR100682816B1 (ko) | 정보 수신 장치 및 정보 수신 방법 | |
JP3652821B2 (ja) | フィルタの所定帯域幅の帯域端周波数検出装置と当該装置を用いたssb送信機およびssb受信機 | |
JP2009105729A (ja) | Fmラジオ受信機 | |
JP4160269B2 (ja) | Fmラジオ受信機 | |
JP6611057B2 (ja) | 受信信号処理装置、受信信号処理方法、及びプログラム | |
US4780908A (en) | Method and apparatus for signal transmission regulation in differential protection | |
JP2948386B2 (ja) | 復調装置及びそれを用いた受信機 | |
JP2006222819A (ja) | 無線受信機における近接帯域監視装置 | |
JPS6016133Y2 (ja) | 周波数偏移信号復調回路 | |
JP2009021721A (ja) | Fmチューナ | |
JPH0440174A (ja) | インパルスノイズ検出回路 | |
JPS61167235A (ja) | 周波数変調方式用受信機におけるマルチパス妨害検出装置 | |
JP2662032B2 (ja) | モデムを用いた通信方法 | |
JP4161150B2 (ja) | Fm受信機 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 99810582.1 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1999940620 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020017002724 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1999940620 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1020017002724 Country of ref document: KR |
|
WWG | Wipo information: grant in national office |
Ref document number: 1020017002724 Country of ref document: KR |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1999940620 Country of ref document: EP |