JP4778463B2 - Modem equipment - Google Patents

Modem equipment Download PDF

Info

Publication number
JP4778463B2
JP4778463B2 JP2007068561A JP2007068561A JP4778463B2 JP 4778463 B2 JP4778463 B2 JP 4778463B2 JP 2007068561 A JP2007068561 A JP 2007068561A JP 2007068561 A JP2007068561 A JP 2007068561A JP 4778463 B2 JP4778463 B2 JP 4778463B2
Authority
JP
Japan
Prior art keywords
common mode
transmission signal
mode current
differential transmission
circuit
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
JP2007068561A
Other languages
Japanese (ja)
Other versions
JP2008235993A (en
Inventor
サントライン・アルノ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP2007068561A priority Critical patent/JP4778463B2/en
Publication of JP2008235993A publication Critical patent/JP2008235993A/en
Application granted granted Critical
Publication of JP4778463B2 publication Critical patent/JP4778463B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

本発明は、１対のワイヤ線路を用いた有線通信に使用されるモデム装置に関し、より詳細には、モデム装置の送信系回路によって１対のワイヤ線路の夫々に対して差動駆動して送信される差動送信信号の出力特性をコモンモード電流に対する規制や制限に適応するように調整するための送信出力調整機能を有するモデム装置に関する。   The present invention relates to a modem device used for wired communication using a pair of wire lines. More specifically, the present invention relates to a transmission system circuit of a modem device, and differentially drives and transmits each of a pair of wire lines. The present invention relates to a modem device having a transmission output adjustment function for adjusting output characteristics of a differential transmission signal to be adapted to restrictions and restrictions on common mode current.

情報の送受信にワイヤ線路を用いる有線通信システムは数多く実用化されており、また、現在も開発中である。斯かる有線通信システム、例えば、ＩＴＵ ｇ９９２．１で規定される電話加入者ライン、ＨｏｍｅＰｌｕｇ−ＡＶ仕様１．１．００（２００５年１２月１６日）で規定される電力線を用いた家庭内ネットワーク等では、２つのモデム装置間における通信を確立するために、通常１対のワイヤ線路を用いて差動送信を行う。差動送信では、１対のワイヤ線路は、通常夫々位相の反転した２つの信号、つまり、両信号の信号出力の和がゼロとなる信号で各別に駆動される。差動送信は、１本のワイヤ線路を用いる送信方式と比べて幾つかの利点を有する。その１つに、ワイヤ線路が理想的な線路特性を有している場合に、放射エネルギがほぼ発生しない状態となる点である。しかしながら、実際の線路特性は決して理想的ではなく、線路対毎に線路インピーダンスが変化する。また、モデム装置のハードウェアもワイヤ線路同様に理想的ではない。斯かるモデム装置のハードウェア上の不完全性や線路特性の変動によって、通信線路上にコモンモード電流が発生する。コモンモード電流による漏洩電波強度は、１対のワイヤ線路の線路特性並びに送信される差動送信信号電力に依存する。一般に、小さな容量等の寄生成分の影響が周波数の上昇とともに顕著となるため、コモンモード電流信号の重要度は周波数とともに上昇する。   Many wired communication systems using wire lines for transmitting and receiving information have been put into practical use and are still under development. Such a wired communication system, for example, a telephone subscriber line defined by ITU g992.1, a home network using a power line defined by HomePlug-AV specification 1.1.00 (December 16, 2005), etc. In order to establish communication between two modem devices, differential transmission is usually performed using a pair of wire lines. In differential transmission, a pair of wire lines is usually driven separately by two signals with inverted phases, that is, signals with the sum of the signal outputs of both signals being zero. Differential transmission has several advantages over transmission schemes that use a single wire line. One of them is that when the wire line has ideal line characteristics, almost no radiant energy is generated. However, the actual line characteristics are never ideal, and the line impedance changes for each line pair. Also, the hardware of the modem device is not ideal as well as the wire line. A common mode current is generated on the communication line due to imperfections in hardware of the modem device and fluctuations in line characteristics. The leaked radio wave intensity due to the common mode current depends on the line characteristics of the pair of wire lines and the transmitted differential transmission signal power. In general, since the influence of parasitic components such as a small capacitance becomes significant as the frequency increases, the importance of the common mode current signal increases with the frequency.

コモンモード電流によって放射される漏洩電波のエネルギは、ラジオ受信機等の精密な電気機器に対して妨害電波となり潜在的に有害であり、放射側のモデム装置と類似するシステムに対して、同システムの動作周波数帯域での干渉が増大するので、当該システムの機能低下を惹起する。線路インピーダンスの変動に対処するために、モデム装置のＡＦＥ（Ａｎａｌｏｇ Ｆｒｏｎｔ Ｅｎｄ）においてインピーダンス適合を図ることで、ある程度のコモンモード電流による漏洩電波強度を低下させることができる（第１の従来技術、例えば、下記の特許文献１参照）。しかし、最近のシステムは、数１０ＭＨｚにまで及ぶ比較的広い周波数帯域を利用するため、広帯域での正確なインピーダンス整合は困難であり、コスト高となる。更に、線路特性が潜在的に非常に広範囲となる可能性があり、斯かるインピーダンス整合システムも非常に多様化した環境に対応可能でなければならない。   The energy of leaked radio waves radiated by the common mode current is a harmful signal to radio equipment such as radio receivers and is potentially harmful. Interference in the operating frequency band increases, causing a reduction in the function of the system. In order to cope with fluctuations in line impedance, it is possible to reduce the leaked radio wave intensity due to a certain common mode current by adapting impedance in the AFE (Analog Front End) of the modem device (first conventional technique, for example, , See Patent Document 1 below). However, since a recent system uses a relatively wide frequency band extending to several tens of MHz, accurate impedance matching in a wide band is difficult and the cost is high. Furthermore, the line characteristics can potentially be very wide, and such an impedance matching system must also be able to handle very diverse environments.

監督機関は、送信機の他の機器に与える影響を制御及び規制するために、通例として、典型的には適合すべき電力マスクを規定して、送信可能な差動送信信号電力を規制する。また、有線通信モデム装置から発生するコモンモード電流のレベルに対して具体的に規制が設けられている場合がある（例えば、高速電力線搬送通信に関する報告書、平成１７年１２月参照）。これらの規制を満足するための一手法として、従来は、基準となる線路インピーダンスを相対的に不利になるように考慮して、差動送信信号電力を減衰させる方法を用いていた（第２の従来技術）。   In order to control and regulate the impact on other equipment of the transmitter, the supervisory body typically regulates the differential transmit signal power that can be transmitted, typically by defining a power mask to be adapted. In addition, there are cases where there are specific restrictions on the level of the common mode current generated from the wired communication modem device (see, for example, a report on high-speed power line carrier communication, December 2005). As a technique for satisfying these regulations, conventionally, a method of attenuating the differential transmission signal power has been used in consideration of the relative line impedance as a relative disadvantage (second method). Conventional technology).

また、電力線のコモンモード電流を測定し、コモンモード電流の大きさに応じて電力線に重畳される電力線通信信号の出力を制御する電力線搬送通信装置が開示されている（第３の従来技術、例えば、下記の特許文献２参照）。   Further, a power line carrier communication device that measures the common mode current of the power line and controls the output of the power line communication signal superimposed on the power line according to the magnitude of the common mode current is disclosed (third prior art, for example, , See Patent Document 2 below).

米国特許第６７２４８９０号明細書US Pat. No. 6,724,890 特開２００６−２０３４８１号公報JP 2006-203481 A

しかし、当該第２の従来技術の手法によって差動送信信号電力を減衰させると、ビットレート、通信距離等のシステム性能が低下する。しかしながら、大抵の場合では、実際の線路特性が考慮した基準より大幅に有利な特性を有しているため、コモンモード電流の規制値を超過することなく、より大電力で差動送信信号を出力できていたことになる。つまり、結果として、より良い通信品質、例えば、より高いビットレートやより長い通信距離が得られていたことになる。また、広帯域送信方式では、通常は上記コモンモード電流の漏洩電波強度に周波数依存性があり、線路インピーダンスを最も不利にする周波数を基準とするので、送信信号電力のゲイン制御だけでは不十分である。従って、上記従来手法に対して、実際に通信線路から放射される漏洩電波強度に基づいて差動送信信号電力を制御すれば、送信出力を更に確保でき、規制を満足しつつシステム性能を最適化できる余地がある。   However, when the differential transmission signal power is attenuated by the second prior art technique, system performance such as bit rate and communication distance is degraded. However, in most cases, the actual transmission line characteristics have characteristics that are significantly more advantageous than the standards considered, so that the differential transmission signal can be output with higher power without exceeding the regulation value of the common mode current. It was done. That is, as a result, better communication quality, for example, a higher bit rate and a longer communication distance have been obtained. In addition, in the wideband transmission method, the leakage wave intensity of the common mode current is usually frequency-dependent, and the frequency that makes the line impedance most unfavorable is used as a reference. Therefore, only the gain control of the transmission signal power is insufficient. . Therefore, compared to the above conventional method, if the differential transmission signal power is controlled based on the leakage radio wave intensity actually radiated from the communication line, the transmission output can be further secured, and the system performance is optimized while satisfying the regulations. There is room for it.

以下、差動送信信号におけるコモンモード電流について、より具体的に説明する。図６に示すように、差動送信では、モデム装置の送信系回路の駆動回路が、夫々信号極正の判定した２つの信号によって１対のワイヤ線路を差動駆動して、信号が送信される。ここで、コモンモード電流ｉｃは、差動対を形成する１対のワイヤ線路上の各電流ｉ１，ｉ２のベクトル和として表される。図６（Ａ）に示すように、１対のワイヤ線路が理想的な線路特性である場合は、１対のワイヤ線路の一方（第１線路）上を流れ出る第１電流ｉ１と、他方（第２線路）上を流れ入る第２電流ｉ２の絶対値が等しいため、各電流ｉ１，ｉ２のベクトル和、つまり、コモンモード電流ｉｃはゼロとなる。しかし、１対のワイヤ線路が実際的な線路特性である場合は、図６（Ｂ）に示すように、各電流ｉ１，ｉ２のベクトル和はゼロとならず、コモンモード電流ｉｃが発生する。発生するコモンモード電流ｉｃの大きさは、モデム装置のハードウェアや１対のワイヤ線路の線路特性と同様に、１対のワイヤ線路に送信された差動送信信号の電力に依存して定まる。広帯域システムでは、コモンモード電流は一般的に周波数依存性を有し、高周波域ほど大きくなる傾向がある。   Hereinafter, the common mode current in the differential transmission signal will be described more specifically. As shown in FIG. 6, in differential transmission, a driving circuit of a transmission system circuit of a modem device differentially drives a pair of wire lines with two signals determined to be signal positive, and signals are transmitted. The Here, the common mode current ic is expressed as a vector sum of currents i1 and i2 on a pair of wire lines forming a differential pair. As shown in FIG. 6A, when a pair of wire lines have ideal line characteristics, the first current i1 flowing out on one (first line) of the pair of wire lines and the other (first) Since the absolute values of the second currents i2 flowing in the two lines) are equal, the vector sum of the currents i1 and i2, that is, the common mode current ic is zero. However, when a pair of wire lines have practical line characteristics, as shown in FIG. 6B, the vector sum of the currents i1 and i2 does not become zero, and a common mode current ic is generated. The magnitude of the generated common mode current ic is determined depending on the power of the differential transmission signal transmitted to the pair of wire lines as well as the hardware of the modem device and the line characteristics of the pair of wire lines. In a broadband system, the common mode current generally has frequency dependence and tends to increase as the frequency increases.

監督機関によりシステムが発生し得るコモンモード電流に対して規制を設けている場合に、モデム装置の送信機は、工場出荷前に、想定される動作条件の全範囲においてコモンモード電流が許容範囲内に収まるように、つまり、ワーストケースを想定した調整がなされる。インピーダンス整合回路等の適応システムが存在する可能性があれば、１回の調整手順において当該装置で達成可能なコモンモード電流の低減を図ろうとする場合に、発生するコモンモード電流の低減に寄与する。しかしながら、実際に利用される差動送信信号の電力は、信号の全周波数帯域においてコモンモード電流の規制値を正確に達成するために利用可能な電力より、略常時下回る。   If the supervisory authority sets restrictions on the common mode current that can be generated by the system, the transmitter of the modem device must be within the allowable range of the common mode current over the full range of expected operating conditions before shipping to the factory. The adjustment is made so that the worst case is assumed. If there is a possibility that an adaptive system such as an impedance matching circuit exists, it contributes to the reduction of the common mode current generated when trying to reduce the common mode current achievable with the device in one adjustment procedure. . However, the power of the differential transmission signal that is actually used is almost always lower than the power that can be used to accurately achieve the regulation value of the common mode current in the entire frequency band of the signal.

図５は、コモンモード電流の許容値（図中破線で表示）が、考慮する規制値に対応して周波数に依存して規定される場合の一例を示している。もしコモンモード電流の実測値（図中実線で表示）が初期状態においてコモンモード電流の許容値を超過する周波数域（矢符５００、５０２、５０４参照）が存在する場合は、差動送信信号の電力を、全周波数範囲においてコモンモード電流が許容範囲内となるように低減しなければならない。しかしながら、図５に示す事例では、コモンモード電流の実測値が初期状態において、殆どの周波数域で許容値以下となっており、僅かな狭い周波数域でのみ許容値を超過しているだけである。   FIG. 5 shows an example in which the allowable value of the common mode current (indicated by a broken line in the figure) is defined depending on the frequency corresponding to the restriction value to be considered. If there is a frequency range (see arrows 500, 502, and 504) where the measured value of the common mode current (indicated by the solid line in the figure) exceeds the allowable value of the common mode current in the initial state, the differential transmission signal The power must be reduced so that the common mode current is within an acceptable range over the entire frequency range. However, in the example shown in FIG. 5, the measured value of the common mode current is less than the allowable value in most frequency ranges in the initial state, and only exceeds the allowable value in a small frequency range. .

差動送信信号の送信電力を低減することで、受信側では信号レベルが低下する。当該受信信号レベルの低下は、非適応システムでは通信品質或いは信頼性の劣化となり、ＤＳＬ（ディジタル加入者向けデータ通信方式）等の適応システムでは、ビットレートの低下、或いは、所定のビットレートでの通信距離の短縮となる。システムの性能を確保するには、周波数全域に亘る差動送信信号の電力抑制は回避すべきで、一般的には、差動送信信号の送信電力は、全ての考慮すべき条件下で最大となるように調整されなければならない。   By reducing the transmission power of the differential transmission signal, the signal level is lowered on the reception side. The decrease in the received signal level results in a deterioration in communication quality or reliability in a non-adaptive system, and in an adaptive system such as DSL (data communication system for digital subscribers), a decrease in bit rate or a predetermined bit rate. The communication distance is shortened. To ensure system performance, power suppression of the differential transmission signal over the entire frequency should be avoided, and in general, the transmission power of the differential transmission signal is maximum under all conditions to be considered. Must be adjusted to be.

また、第３の従来技術の電力線搬送通信装置（モデム装置）は、図７に示すように、外部装置４０と電力線３９との間に設けられ、電力線３９を媒体として電力線通信信号の送受信を行うモデム装置３０であって、電力線３９に対して電力線通信信号の入出力を行う信号／電源結合回路３４と、信号／電源結合回路３４から取り出された電力によりこのモデム装置３０を作動させる電源回路３５と、外部装置４０から渡された送信データを電力線通信信号に変調する変調回路３１と、電力線３９を介して受け取った電力線通信信号を復調して外部装置４０に受信データとして渡す復調回路３２と、電力線３９を流れるコモンモード電流の電流値Ｉｃを測定するコモンモード電流測定装置３６と、測定されたコモンモード電流の電流値Ｉｃをディジタル電流値Ｉｄに変換するＡ／Ｄ変換回路３７と、コモンモード電流測定装置３６により測定された電流値に基づいて変調回路３１の出力が所定の値になるように制御する出力制御回路３８と、を備えて構成されている。斯かる構成により、電力線３９のコモンモード電流の電流値を測定し、変調回路３１の出力が所定の値になるようにフィードバックさせることにより、コモンモード電流の変化により自動的にモデム装置３０の出力が調整され、漏洩電界の大きさが設定値を超えないように制御される。しかしながら、図７に示す構成では、コモンモード電流測定装置３で測定されたコモンモード電流の電流値を出力制御回路３８で処理可能に適正に処理するためのＡ／Ｄ変換回路３７等の受信回路、及び、専用の出力制御回路３８が別途必要となる。特許文献２では詳細には開示されていないが、コモンモード電流を出力制御回路３８で処理可能に適正に処理するには、上記Ａ／Ｄ変換回路３７の他にも、高速フーリエ変換のような時間ドメインから周波数ドメインへの信号変換処理も必要となる。更に、コモンモード電流は、モデム装置３０の送信或いは受信する差動信号の全周波数帯域に亘ってモニターする必要がり、別途設けられたＡ／Ｄ変換回路３７等の受信回路の性能は、モデム装置３０の本来の送受信に係る差動信号の受信回路（復調回路３２）と同等ものが要求される。従って、これらの処理装置を別途備えることがモデム装置全体の製造コスト高騰の要因となる。   Further, as shown in FIG. 7, the third prior art power line carrier communication device (modem device) is provided between the external device 40 and the power line 39, and transmits and receives power line communication signals using the power line 39 as a medium. The modem device 30 includes a signal / power source coupling circuit 34 for inputting / outputting a power line communication signal to / from the power line 39, and a power source circuit 35 for operating the modem device 30 by the electric power extracted from the signal / power source coupling circuit 34. A modulation circuit 31 that modulates transmission data passed from the external device 40 into a power line communication signal; a demodulation circuit 32 that demodulates the power line communication signal received via the power line 39 and passes it to the external device 40 as received data; The common mode current measuring device 36 that measures the current value Ic of the common mode current flowing through the power line 39, and the measured current value Ic of the common mode current An A / D conversion circuit 37 for converting to a digital current value Id; an output control circuit 38 for controlling the output of the modulation circuit 31 to be a predetermined value based on the current value measured by the common mode current measuring device 36; , And is configured. With such a configuration, the current value of the common mode current of the power line 39 is measured and fed back so that the output of the modulation circuit 31 becomes a predetermined value, so that the output of the modem device 30 is automatically generated by the change of the common mode current. Is adjusted so that the magnitude of the leakage electric field does not exceed the set value. However, in the configuration shown in FIG. 7, a receiving circuit such as an A / D conversion circuit 37 for appropriately processing the current value of the common mode current measured by the common mode current measuring device 3 so that it can be processed by the output control circuit 38. In addition, a dedicated output control circuit 38 is required separately. Although not disclosed in detail in Patent Document 2, in order to appropriately process the common mode current so that it can be processed by the output control circuit 38, in addition to the A / D conversion circuit 37, a fast Fourier transform or the like is used. Signal conversion processing from the time domain to the frequency domain is also required. Further, the common mode current needs to be monitored over the entire frequency band of the differential signal transmitted or received by the modem device 30, and the performance of the receiving circuit such as the separately provided A / D conversion circuit 37 is determined by the modem device. 30 is required to be equivalent to a differential signal receiving circuit (demodulation circuit 32) related to original transmission / reception. Therefore, the provision of these processing devices separately causes a rise in the manufacturing cost of the entire modem device.

本発明は、上記問題点に鑑みてなされたものであり、その目的は、コモンモード電流に対する規制を満足し、高い通信品質を維持可能な、モデム装置から送信される差動送信信号の出力特性を低コストに調整可能なモデム装置を提供する点にある。   The present invention has been made in view of the above problems, and an object of the present invention is to satisfy the regulations on the common mode current and maintain the high communication quality, and output characteristics of the differential transmission signal transmitted from the modem device. Is to provide a modem device that can be adjusted at low cost.

上記目的を達成するための本発明に係るモデム装置は、１対のワイヤ線路を用いて有線通信を行うモデム装置であって、ディジタルデータを所定のディジタル変調方式で変調した後にアナログ信号に変換して、第１差動送信信号として前記１対のワイヤ線路の夫々に対して差動駆動して送信する送信系回路と、他のモデム装置から前記１対のワイヤ線路に送信された第２差動送信信号を差動検出した後にディジタル信号に変換して前記ディジタル変調方式に対応する復調方式で復調してディジタルデータを再生する受信系回路と、前記送信系回路から前記１対のワイヤ線路に送信された前記差動送信信号のコモンモード電流を検出するコモンモード電流検出手段と、前記受信系回路の入力端で受信された前記第２差動送信信号と前記コモンモード電流検出手段の検出出力を切り替えて、前記受信系回路の前記入力端より後段の回路に入力する入力切替手段と、前記送信系回路に対して、前記１対のワイヤ線路への前記差動送信信号の送信を行わせ、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えるとともに、前記コモンモード電流の１または複数の特性値が所定の規定範囲内に収まるように、前記受信系回路で処理された前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路により差動駆動される前記第１差動送信信号の出力特性を調整する制御回路と、を備えてなることを第１の特徴とする。

In order to achieve the above object, a modem device according to the present invention is a modem device that performs wired communication using a pair of wire lines, which modulates digital data by a predetermined digital modulation method and converts it into an analog signal. A transmission system circuit that differentially drives and transmits each of the pair of wire lines as a first differential transmission signal and a second difference transmitted from the other modem device to the pair of wire lines. A differential signal is detected after a dynamic transmission signal is converted into a digital signal and demodulated by a demodulation method corresponding to the digital modulation method to reproduce digital data, and from the transmission system circuit to the pair of wire lines Common mode current detection means for detecting a common mode current of the transmitted differential transmission signal; and the second differential transmission signal received at the input terminal of the reception system circuit and the common mode. Input switching means for switching the detection output of the current detection means and inputting it to a circuit downstream from the input end of the reception system circuit, and the differential to the pair of wire lines with respect to the transmission system circuit Transmitting a transmission signal, switching the input of the input switching means to the detection output of the common mode current detection means, and so that one or more characteristic values of the common mode current are within a predetermined specified range, A control circuit that adjusts output characteristics of the first differential transmission signal that is differentially driven by the transmission system circuit according to the detection output of the common mode current detection means processed by the reception system circuit. This is the first feature.

上記第１の特徴のモデム装置によれば、モデム装置の送信系回路から送信される差動送信信号の出力特性を、コモンモード電流検出手段の検出出力に応じて調整可能であるため、実際に１対のワイヤ線路において発生するコモンモード電流が規定値を超過しないように差動送信信号の出力特性（例えば、送信電力）を調整できるため、不必要に差動送信信号の信号強度が低下しないため、ビットレートや通信距離等の通信品質を、コモンモード電流に対する規制を満足する範囲内で最適化することができる。   According to the modem device of the first feature, the output characteristics of the differential transmission signal transmitted from the transmission system circuit of the modem device can be adjusted according to the detection output of the common mode current detection means. Since the output characteristics (for example, transmission power) of the differential transmission signal can be adjusted so that the common mode current generated in the pair of wire lines does not exceed the specified value, the signal strength of the differential transmission signal is not unnecessarily decreased. Therefore, the communication quality such as the bit rate and the communication distance can be optimized within a range satisfying the restriction on the common mode current.

１対のワイヤ線路の線路特性のランダム性により、コモンモード電流を予測して差動送信信号の送信電力を調整することは現実的でないため、コモンモード電流検出手段によってワイヤ線路上の実際のコモンモード電流を測定することで、緻密なコモンモード電流の評価が可能となり、差動送信信号の出力特性の最適な調整が可能となる。また、コモンモード電流を直接測定することで、差動送信信号の送信電力の調整過程において、ワイヤ線路のインピーダンス、線路間のバランス等の線路特性は直接的に考慮されることなく、線路特性とモデム装置のハードウェア特性の結合した影響が、コモンモード電流によって評価されることになる。   Due to the randomness of the line characteristics of a pair of wire lines, it is not realistic to predict the common mode current and adjust the transmission power of the differential transmission signal. By measuring the mode current, a precise common mode current can be evaluated, and the output characteristics of the differential transmission signal can be optimally adjusted. Also, by directly measuring the common mode current, the line characteristics such as the impedance of the wire line and the line characteristics such as the balance between the lines are not directly considered in the adjustment process of the transmission power of the differential transmission signal. The combined effect of the modem device hardware characteristics will be evaluated by the common mode current.

更に、通常動作において使用する受信系回路を用いて、コモンモード電流検出手段のアナログ値である検出出力に対して、増幅処理やアナログ・ディジタル変換等の信号処理を施すことができるので、制御回路として、モデム装置に内蔵されている通常のディジタル信号入力を処理可能なプロセッサ等を利用することができる。   Furthermore, signal processing such as amplification processing and analog / digital conversion can be performed on the detection output, which is an analog value of the common mode current detection means, using a receiving system circuit used in normal operation. As such, a processor or the like that can process a normal digital signal input incorporated in the modem device can be used.

換言すれば、モデム装置で使用される通信方式が時分割多重方式等の一般的に同じ周波数帯域でデータの送受信が可能な通信方式である場合、モデム装置の受信系回路を、コモンモード電流検出手段の検出信号を取得して処理するのに使用できるため、送信出力調整回路において、コモンモード電流検出手段の検出信号の処理に必要な回路をモデム装置に本来的に具備されている受信系回路で兼用でき、回路構成が簡略化される。   In other words, when the communication method used in the modem device is a communication method capable of transmitting and receiving data in the same frequency band, such as a time division multiplexing method, the common system current detection is performed on the receiving circuit of the modem device. In the transmission output adjustment circuit, a circuit necessary for processing of the detection signal of the common mode current detection means is inherently provided in the modem device because it can be used to acquire and process the detection signal of the means. The circuit configuration can be simplified.

本発明に係るモデム装置は、上記第１の特徴に加えて、更に、前記差動送信信号が、マルチキャリア変調された信号を差動駆動した信号であり、前記コモンモード電流検出手段が、前記マルチキャリア変調に用いる搬送波の周波数別に、前記差動送信信号のコモンモード電流を検出し、前記制御回路が、前記周波数別に、前記コモンモード電流の前記特性値が前記周波数別に設定された所定の規定範囲内に収まるように、前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路から送信される前記差動送信信号の出力特性を調整することを第２の特徴とする。   In the modem device according to the present invention, in addition to the first feature, the differential transmission signal is a signal obtained by differentially driving a multicarrier-modulated signal. A common mode current of the differential transmission signal is detected for each frequency of a carrier wave used for multicarrier modulation, and the control circuit has a predetermined rule in which the characteristic value of the common mode current is set for each frequency for each frequency. A second feature is that output characteristics of the differential transmission signal transmitted from the transmission system circuit are adjusted in accordance with a detection output of the common mode current detection means so as to fall within a range.

上記第２の特徴のモデム装置によれば、広帯域送信方式であるマルチキャリア変調方式において、線路特性に周波数依存性がある場合や、コモンモード電流が周波数別（或いは周波数帯域別）に規制されている場合において、コモンモード電流に対する規制を満足する範囲内で周波数別に差動送信信号の出力特性（例えば、送信電力）を調整できるため、通信品質を更に最適化して向上させることができる。   According to the modem device of the second feature, in the multi-carrier modulation method, which is a broadband transmission method, when the line characteristic has frequency dependency, or the common mode current is regulated by frequency (or by frequency band). In this case, the output characteristics (for example, transmission power) of the differential transmission signal can be adjusted for each frequency within a range satisfying the restriction on the common mode current, so that the communication quality can be further optimized and improved.

ＯＦＤＭ等のマルチキャリア通信方式の場合、差動送信信号の送信電力はキャリア毎の周波数別に制御することで緻密な調整が可能であり、コモンモード電流は、差動送信信号の送信電力に依存するので、差動送信信号の送信電力の調整と同様に、周波数別に規定範囲内に収まるように調整可能である。   In the case of a multicarrier communication system such as OFDM, the transmission power of the differential transmission signal can be finely adjusted by controlling the frequency for each carrier, and the common mode current depends on the transmission power of the differential transmission signal. Therefore, as with the adjustment of the transmission power of the differential transmission signal, the frequency can be adjusted so as to be within a specified range for each frequency.

本発明に係るモデム装置は、上記第１または第２の特徴に加えて、更に、前記制御回路が、前記コモンモード電流検出手段の検出出力を処理して、前記差動送信信号の出力特性に対する調整量を予測するマイクロプロセッサを備えることを第３の特徴とする。   In the modem device according to the present invention, in addition to the first or second feature described above, the control circuit further processes the detection output of the common mode current detection unit, and outputs the differential transmission signal output characteristics. A third feature is that a microprocessor for predicting the adjustment amount is provided.

上記第３の特徴のモデム装置によれば、予測された調整値に基づいて差動送信信号の出力特性に対する調整可能なフォーワード制御系を実現でき、上記第１または第２の特徴構成による作用効果を具体的に奏することができる。   According to the modem device of the third feature, it is possible to realize an adjustable forward control system for the output characteristics of the differential transmission signal based on the predicted adjustment value, and the operation according to the first or second feature configuration. An effect can be specifically produced.

本発明に係るモデム装置は、上記何れかの特徴に加えて、更に、前記制御回路が、前記コモンモード電流検出手段の検出出力に基づいて、少なくとも１つの前記特性値を導出する第１処理と、前記第１処理で導出した導出特性値と、当該特性値の基準値とを比較する第２処理と、前記導出特性値が前記基準値以下で前記基準値の所定範囲内にあれば、前記差動送信信号の出力特性に対する制御を行わず、前記導出特性値が前記基準値の所定範囲外であれば、前記導出特性値が前記基準値より大きい場合に前記差動送信信号の送信電力を低下させる処理と、前記導出特性値が前記基準値より小さい場合に前記差動送信信号の送信電力を増大させる処理の少なくとも何れか一方を実行する第３処理と、を実行することを第４の特徴とする。   In addition to any of the above features, the modem device according to the present invention further includes a first process in which the control circuit derives at least one characteristic value based on a detection output of the common mode current detection unit. A second process for comparing the derived characteristic value derived in the first process with a reference value of the characteristic value; and if the derived characteristic value is equal to or less than the reference value and within a predetermined range of the reference value, If the output characteristic of the differential transmission signal is not controlled and the derived characteristic value is outside the predetermined range of the reference value, the transmission power of the differential transmission signal is set when the derived characteristic value is greater than the reference value. Performing a third process for performing at least one of a process for reducing and a process for increasing the transmission power of the differential transmission signal when the derived characteristic value is smaller than the reference value. Features.

本発明に係るモデム装置は、上記第４の特徴に加えて、更に、前記制御回路が、前記差動送信信号の送信電力を所定の低レベルに設定して前記差動送信信号の出力特性の制御を開始し、前記第３処理において前記差動送信信号の送信電力を徐々に増大させる制御を行い、制御期間中において前記導出特性値を前記基準値以下に維持することを第５の特徴とする。   In the modem device according to the present invention, in addition to the fourth feature described above, the control circuit further sets the transmission power of the differential transmission signal to a predetermined low level, and sets the output characteristics of the differential transmission signal. The fifth feature is that control is started, control is performed to gradually increase the transmission power of the differential transmission signal in the third process, and the derived characteristic value is maintained below the reference value during the control period. To do.

本発明に係るモデム装置は、上記第４の特徴に加えて、更に、前記制御回路が、前記差動送信信号の送信電力を所定の基準レベルに設定して前記差動送信信号の出力特性の制御を開始し、前記導出特性値が前記基準値より大きい場合にのみ、前記導出特性値が前記基準値以下となるまで、前記差動送信信号の送信電力を低下させる処理を行うことを第６の特徴とする。   In the modem device according to the present invention, in addition to the fourth feature described above, the control circuit further sets the transmission power of the differential transmission signal to a predetermined reference level and sets the output characteristics of the differential transmission signal. Control is started, and only when the derived characteristic value is larger than the reference value, a process of reducing the transmission power of the differential transmission signal is performed until the derived characteristic value becomes equal to or less than the reference value. It is characterized by.

本発明に係るモデム装置は、上記何れかの特徴に加えて、更に、前記制御回路が、前記送信系回路に対して、他のモデム装置での受信を誘導しない調整専用の擬似的な差動送信信号を、前記擬似的な差動送信信号の１または複数の所定の統計値が、前記モデム装置間で送受信される通常のデータ信号における前記所定の統計値と近似するように、ランダムに送信させる制御を行うことを第７の特徴とする。   In addition to any of the above features, the modem device according to the present invention further includes a pseudo-differential dedicated for adjustment that does not induce reception by another modem device with respect to the transmission system circuit. Transmitting the transmission signal randomly so that one or more predetermined statistical values of the pseudo differential transmission signal approximate the predetermined statistical value in a normal data signal transmitted and received between the modem devices The seventh feature is to perform the control.

本発明に係るモデム装置は、上記何れかの特徴に加えて、前記コモンモード電流の１または複数の前記特性値が、前記コモンモード電流の平均値、尖頭値、準尖頭値、及び、その他の統計値の内の少なくとも何れか１つであることを第８の特徴とする。   In the modem device according to the present invention, in addition to any one of the above features, the one or more characteristic values of the common mode current may be an average value, a peak value, a quasi-peak value of the common mode current, and The eighth characteristic is that it is at least one of the other statistical values.

上記第４乃至第８の何れかの特徴のモデム装置によれば、周波数帯域全体或いは周波数別において、具体的に、コモンモード電流に対する規制を満足する範囲内で周波数別に差動送信信号の出力特性（例えば、送信電力）を調整できる。   According to the modem device having any one of the fourth to eighth characteristics, the output characteristics of the differential transmission signal for each frequency within a range satisfying the restriction on the common mode current, in the entire frequency band or for each frequency. (For example, transmission power) can be adjusted.

特に、上記第７の特徴のモデム装置によれば、差動送信信号の出力特性の調整によって、同じワイヤ線路７上に接続する他のモデム装置に対する不要な干渉を防止できる。   In particular, according to the modem device having the seventh feature, unnecessary interference with other modem devices connected on the same wire line 7 can be prevented by adjusting the output characteristics of the differential transmission signal.

本発明に係るモデム装置は、上記何れかの特徴に加えて、前記コモンモード電流の前記特性値の複数に対して、前記所定の規定範囲が設定されており、その内の１つの前記特性値が、他の前記特性値より、前記規定範囲による抑圧度が大きい場合、前記制御回路が、前記抑圧度の大きい１つの前記特性値が前記規定範囲内に収まるように、前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路から送信される前記差動送信信号の出力特性を調整し、全ての特性値が各別に個々の前記規定範囲内に収まるようにすることを第９の特徴とする。   In addition to any one of the above characteristics, the modem device according to the present invention has the predetermined prescribed range set for a plurality of the characteristic values of the common mode current, and one of the characteristic values However, when the degree of suppression by the specified range is larger than the other characteristic value, the control circuit detects the common mode current detecting unit so that one characteristic value having the large degree of suppression is within the specified range. Adjusting the output characteristics of the differential transmission signal transmitted from the transmission system circuit in accordance with the detected output of the transmission system circuit so that all the characteristic values are individually within the specified range. Features.

上記第９の特徴のモデム装置によれば、コモンモード電流の特性値の複数に対して、所定の規定範囲が夫々設定されている場合において、全ての特性値が各別に個々の規定範囲内に収まるような、差動送信信号の出力特性の調整を簡易に実行することができる。   According to the modem device of the ninth feature, when a predetermined specified range is set for each of a plurality of characteristic values of the common mode current, all the characteristic values are within individual specified ranges. Adjustment of the output characteristics of the differential transmission signal can be easily performed so as to fit.

本発明に係るモデム装置は、上記何れかの特徴に加えて、更に、前記第１差動送信信号の出力特性の初期調整後において、前記制御回路が、前記受信系回路が前記第２差動送信信号を受信しない場合に、前記受信系回路が前記コモンモード電流検出手段の検出出力を処理して前記コモンモード電流の前記特性値の変動を監視できるように、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替える制御を行うことを第１０の特徴とする。   In addition to any one of the above features, the modem device according to the present invention further includes, after initial adjustment of an output characteristic of the first differential transmission signal, the control circuit, the receiving system circuit being the second differential signal. When the transmission signal is not received, the input of the input switching unit is set so that the reception system circuit can process the detection output of the common mode current detection unit and monitor the variation of the characteristic value of the common mode current. A tenth feature is to perform control to switch to the detection output of the common mode current detection means.

本発明に係るモデム装置は、上記第１０の特徴に加えて、更に、前記第１差動送信信号の出力特性の初期調整後において、前記コモンモード電流の前記特性値の変動を検知した場合、前記制御回路が、前記差動送信信号の出力特性の再調整に関するメッセージを他のモデム装置に送信する制御を行うことを第１１の特徴とする。   In addition to the tenth feature, the modem device according to the present invention further includes, after initial adjustment of an output characteristic of the first differential transmission signal, detecting a change in the characteristic value of the common mode current, An eleventh feature is that the control circuit performs control to transmit a message related to readjustment of the output characteristic of the differential transmission signal to another modem device.

上記第１０または第１１の特徴のモデム装置によれば、第１差動送信信号の出力特性の初期調整後において、コモンモード電流の特性値が変動しても、当該変動を抑制して規制範囲内に収まるように、第１差動送信信号の出力特性を再調整できる。特に、第４の特徴のモデム装置によれば、通信相手の他のモデム装置が、第１差動送信信号の出力特性の再調整が行われることを事前確認できるので、不用意な通信接続の切断を回避できる。   According to the modem device of the tenth or eleventh feature, even if the characteristic value of the common mode current fluctuates after the initial adjustment of the output characteristic of the first differential transmission signal, the fluctuation is suppressed and the regulation range is suppressed. The output characteristics of the first differential transmission signal can be readjusted so as to be within the range. In particular, according to the modem device of the fourth feature, the other modem device of the communication partner can confirm in advance that the output characteristics of the first differential transmission signal are readjusted. Cutting can be avoided.

本発明に係るモデム装置は、上記何れか特徴に加えて、更に、前記制御回路が、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えられた場合に、前記受信系回路を構成する少なくとも一部の回路部分または回路素子の特性またはゲインを所定値に設定し、当該所定値に設定された前記特性またはゲインを考慮して、前記第１差動送信信号の出力特性を調整することを第１２の特徴とする。   In addition to any of the above-described features, the modem device according to the present invention further includes the reception system circuit when the control circuit switches the input of the input switching unit to the detection output of the common mode current detection unit. The characteristic or gain of at least a part of the circuit parts or circuit elements constituting the predetermined value is set to a predetermined value, and the output characteristic of the first differential transmission signal is set in consideration of the characteristic or gain set to the predetermined value. Adjustment is the twelfth feature.

上記第１２の特徴のモデム装置によれば、コモンモード電流検出手段の検出出力の信号処理に利用する受信系回路の特性等を考慮して正確に第１差動送信信号の出力特性を調整できる。   According to the modem device of the twelfth feature, the output characteristics of the first differential transmission signal can be accurately adjusted in consideration of the characteristics of the reception system circuit used for signal processing of the detection output of the common mode current detection means. .

以下、本発明に係るモデム装置（以下、適宜「本発明装置」と略称する）の実施形態を図面に基づいて説明する。以下の実施形態では、使用する通信方式として、直交周波数分割多重（Ｏｒｔｈｏｇｏｎａｌ Ｆｒｅｑｕｅｎｃｙ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅｘｉｎｇ：ＯＦＤＭ）等のマルチキャリア通信方式を想定して、本発明装置の説明を行うが、本発明装置で使用する通信方式は、ＯＦＤＭ等のマルチキャリア通信方式に限定されるものではない。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a modem device according to the present invention (hereinafter simply referred to as “the present device” as appropriate) will be described below with reference to the drawings. In the following embodiments, the present invention apparatus will be described on the assumption that a multicarrier communication system such as Orthogonal Frequency Division Multiplexing (OFDM) is used as the communication system to be used. The communication method is not limited to a multicarrier communication method such as OFDM.

図１に、本発明装置の概略のシステム構成を模式的に示す。図１に示す本発明装置は、送信系回路１、受信系回路２、制御回路としてのマイクロコントローラ３、差動信号結合装置４、コモンモード電流検出手段５、及び、入力切替手段６を備えて構成される。送信系回路１と受信系回路２は、広帯域のマルチキャリア通信方式でのデータ送受信を行う一般的なモデム装置の送信系回路と受信系回路２である。   FIG. 1 schematically shows a schematic system configuration of the device of the present invention. The device of the present invention shown in FIG. 1 includes a transmission system circuit 1, a reception system circuit 2, a microcontroller 3 as a control circuit, a differential signal coupling device 4, a common mode current detection means 5, and an input switching means 6. Composed. The transmission system circuit 1 and the reception system circuit 2 are a transmission system circuit and a reception system circuit 2 of a general modem device that performs data transmission / reception in a broadband multicarrier communication system.

送信系回路１は、ディジタルデータＤｉｎをＯＦＤＭ変調したＯＦＤＭ信号をアナログ信号に変換して１対のワイヤ線路７を差動駆動して送信する回路であって、前段のディジタル信号処理領域に、逆高速フーリエ変換処理（Ｉｎｖｅｒｓｅ Ｆａｓｔ Ｆｏｕｒｉｅｒ Ｔｒａｎｓｆｏｒｍａｔｉｏｎ：ＩＦＦＴ）を行うＩＦＦＴ回路部１１、サイクリックプレフィックスの付加処理等の中間処理を行う中間処理部１２、ディジタル・アナログ変換処理を行うＤＡコンバータ１３を備え、後段のアナログ信号処理領域に、増幅器１４、増幅器１４からの出力信号に基づいて差動送信信号を生成し駆動する駆動回路１５を備えて構成される。ＯＦＤＭ変調処理は、ＩＦＦＴ処理及びサイクリックプレフィックスの付加処理等の中間処理により実現される。駆動回路１５で差動駆動された差動送信信号は、差動信号結合装置４を介して１対のワイヤ線路７に送信される。   The transmission system circuit 1 is a circuit that converts an OFDM signal obtained by OFDM-modulating the digital data Din into an analog signal and differentially drives a pair of wire lines 7 to transmit the signal to the preceding digital signal processing region. It includes an IFFT circuit unit 11 that performs fast Fourier transform processing (IFFT), an intermediate processing unit 12 that performs intermediate processing such as cyclic prefix addition processing, and a DA converter 13 that performs digital / analog conversion processing. The analog signal processing area includes an amplifier 14 and a drive circuit 15 that generates and drives a differential transmission signal based on an output signal from the amplifier 14. The OFDM modulation processing is realized by intermediate processing such as IFFT processing and cyclic prefix addition processing. The differential transmission signal differentially driven by the drive circuit 15 is transmitted to the pair of wire lines 7 via the differential signal coupling device 4.

受信系回路２は、送信系回路１とは逆に、１対のワイヤ線路７から差動信号結合装置４を介して受信した差動受信信号を、増幅及びフィルタ処理した後にディジタル信号に変換してＯＦＤＭ復調して送信元のディジタルデータＤｏｕｔに再現する回路であって、前段のアナログ信号処理領域に、増幅器２１、フィルタ回路２２、アナログ・ディジタル変換処理を行うＡＤコンバータ２３を備え、後段のディジタル信号処理領域に、サイクリックプレフィックスの除去処理等の中間処理を行う中間処理部２４、高速フーリエ変換処理（Ｆａｓｔ Ｆｏｕｒｉｅｒ Ｔｒａｎｓｆｏｒｍａｔｉｏｎ：ＦＦＴ）を行うＦＦＴ回路部２５を備えて構成される。ＯＦＤＭ復調処理は、サイクリックプレフィックスの除去処理等の中間処理とＦＦＴ処理により実現される。   In contrast to the transmission system circuit 1, the reception system circuit 2 amplifies and filters the differential reception signal received from the pair of wire lines 7 via the differential signal coupling device 4, and converts it into a digital signal. A circuit that reproduces the digital data Dout of the transmission source by performing OFDM demodulation, and includes an amplifier 21, a filter circuit 22, and an AD converter 23 that performs analog-digital conversion processing in the analog signal processing area of the previous stage, and the digital of the subsequent stage The signal processing area includes an intermediate processing unit 24 that performs intermediate processing such as cyclic prefix removal processing and an FFT circuit unit 25 that performs fast Fourier transformation (FFT). The OFDM demodulation processing is realized by intermediate processing such as cyclic prefix removal processing and FFT processing.

マイクロコントローラ３は、送信動作において、入力してくるディジタルデータＤｉｎに対して、エンコードやローディング等の通信方式に応じて要求される所定の処理を実行して、処理後のディジタルデータをＩＦＦＴ回路部１１に供給し、受信動作において、ＦＦＴ回路部２５からＯＦＤＭ復調後のディジタルデータを受け取り、送信動作とは逆の所定の処理を行う。   In the transmission operation, the microcontroller 3 performs predetermined processing required for the input digital data Din in accordance with a communication method such as encoding and loading, and the processed digital data is transferred to the IFFT circuit unit. 11 and receives the digital data after OFDM demodulation from the FFT circuit unit 25 in the reception operation, and performs a predetermined process opposite to the transmission operation.

差動信号結合装置４は、本発明装置の送信動作及び受信動作において共通に使用され、送信動作においては、駆動回路１５で差動駆動された差動送信信号を１対のワイヤ線路７に結合させ、受信動作において、受信系回路２の入力端として、１対のワイヤ線路７上の差動信号を受信系回路２の増幅器２１の入力に結合させる回路で、トランス等の従来の有線モデム装置で使用されているものが利用できる。   The differential signal coupling device 4 is commonly used in the transmission operation and the reception operation of the device of the present invention. In the transmission operation, the differential transmission signal differentially driven by the drive circuit 15 is coupled to a pair of wire lines 7. In a receiving operation, a circuit that couples a differential signal on a pair of wire lines 7 to an input of an amplifier 21 of the receiving system circuit 2 as an input terminal of the receiving system circuit 2, and a conventional wired modem device such as a transformer The ones used in are available.

コモンモード電流検出手段５は、１対のワイヤ線路７に設けられ、その検出出力が入力切替手段６を介して、受信系回路２の増幅器２１に入力可能に構成されている。検出出力は、受信系回路２の増幅器２１で処理可能なように、差動信号結合装置４からの出力と同様に１対の差動信号として出力される。コモンモード電流検出手段５は、１対のワイヤ線路７上に発生するコモンモード電流を検出可能な物理的な装置であれば、その電流検出原理や構造は問わない。例えば、１対のワイヤ線路７上の各電流をトランスやコイル等を用いて検出する１対の電流プローブ等が利用可能である。   The common mode current detection means 5 is provided on a pair of wire lines 7, and its detection output can be input to the amplifier 21 of the reception system circuit 2 via the input switching means 6. The detection output is output as a pair of differential signals in the same manner as the output from the differential signal coupling device 4 so that it can be processed by the amplifier 21 of the reception system circuit 2. As long as the common mode current detection means 5 is a physical device capable of detecting the common mode current generated on the pair of wire lines 7, the current detection principle and structure are not limited. For example, a pair of current probes that detect each current on the pair of wire lines 7 using a transformer, a coil, or the like can be used.

入力切替手段６は、マイクロコントローラ３からの切り替え制御によって、差動信号結合装置４から出力される差動受信信号と、コモンモード電流検出手段５から出力される差動信号の何れか一方を選択して、増幅器２１に入力するスイッチ回路である。   The input switching means 6 selects either the differential reception signal output from the differential signal coupling device 4 or the differential signal output from the common mode current detection means 5 by switching control from the microcontroller 3. The switch circuit is input to the amplifier 21.

マイクロコントローラ３は、更に、通常の送受信動作において、送信系回路１及び受信系回路２の制御を行うとともに、後述する差動送信信号の出力特性の調整動作では、入力切替手段６の入力を、コモンモード電流検出手段５からの検出出力に切り替える制御を行うとともに、受信系回路２の一部の回路に対して、受信系回路２がコモンモード電流検出手段５の検出出力を適切に処理可能となるように追加的な制御を行う。   The microcontroller 3 further controls the transmission system circuit 1 and the reception system circuit 2 in a normal transmission / reception operation. In the operation for adjusting the output characteristics of a differential transmission signal, which will be described later, the input of the input switching means 6 is The control to switch to the detection output from the common mode current detection means 5 is performed, and the reception system circuit 2 can appropriately process the detection output of the common mode current detection means 5 for some circuits of the reception system circuit 2. Perform additional control to

差動送信信号の出力特性の調整動作で使用するコモンモード電流検出手段５の特性によって、検出出力（差動信号）の信号振幅や電力（平均値、尖頭値）が、通常の受信動作で増幅器２１に入力する差動受信信号と大きく異なる可能性がある。例えば、検出出力（差動信号）の信号振幅が大きく、逆に、差動信号結合装置４を介して受信されたワイヤ線路７上の差動受信信号が大きく減衰している場合がある。仮に、増幅器２１に対して上記追加的な制御が行われないとすれば、増幅器２１の後段において、コモンモード電流検出手段５の検出出力が飽和してしまう虞がある。尚、増幅器２１に対して上記追加的な制御等の調整に時間を要する場合、例えば、入力切替手段６の入力をコモンモード電流検出手段５からの検出出力と通常の受信動作における差動信号との間で切り替える制御が比較的速く行われ、当該追加的な制御等の調整時間が入力切替手段６の切替制御時間に対して長過ぎて受け入れられない場合には、差動送信信号の出力特性の調整動作が十分でなくなる。また、コモンモード電流検出手段５の検出出力をマイクロコントローラ３で処理できるように、検出出力が受信系回路２の増幅器２１やフィルタ回路２２等で受ける影響を補償するために、当該各回路に対する制御が必要となる。   Depending on the characteristics of the common mode current detection means 5 used in the adjustment operation of the output characteristics of the differential transmission signal, the signal amplitude and power (average value, peak value) of the detection output (differential signal) can be changed in the normal reception operation. There is a possibility that the differential reception signal input to the amplifier 21 is greatly different. For example, the signal amplitude of the detection output (differential signal) may be large, and conversely, the differential reception signal on the wire line 7 received via the differential signal coupling device 4 may be greatly attenuated. If the additional control is not performed on the amplifier 21, the detection output of the common mode current detection means 5 may be saturated at the subsequent stage of the amplifier 21. When it takes time to adjust the additional control or the like for the amplifier 21, for example, the input of the input switching means 6 is detected from the detection output from the common mode current detection means 5 and the differential signal in the normal reception operation. When the control for switching between them is performed relatively quickly and the adjustment time for the additional control is too long for the switching control time of the input switching means 6 to be accepted, the output characteristics of the differential transmission signal The adjustment operation is not sufficient. Further, in order to compensate the influence of the detection output on the amplifier 21 and the filter circuit 22 of the reception system circuit 2 so that the detection output of the common mode current detection means 5 can be processed by the microcontroller 3, the control on each circuit is performed. Is required.

本実施形態では、コモンモード電流検出手段５の検出出力は、本発明装置に内蔵される入力切替手段６と受信系回路２を経由して、本発明装置に内蔵されるマイクロコントローラ３に入力される構成となっている。   In this embodiment, the detection output of the common mode current detection means 5 is input to the microcontroller 3 built in the device of the present invention via the input switching means 6 and the receiving system circuit 2 built in the device of the present invention. It is the composition which becomes.

以下、本発明装置を用いることで、ＯＦＤＭ等のマルチキャリア通信方式のモデム装置で発生するコモンモード電流が、例えば監督機関等によって定められた規定範囲内に収まるように、送信系回路１から出力される差動送信信号の出力特性を調整する手順について説明する。   Hereinafter, by using the device of the present invention, an output from the transmission system circuit 1 is made so that a common mode current generated in a modem device of a multicarrier communication system such as OFDM falls within a specified range determined by a supervisory organization, for example. A procedure for adjusting the output characteristics of the differential transmission signal will be described.

先ず、全体的な流れとしては、本発明装置の起動時に、本発明装置の使用場所での使用周波数帯域に対して定められたコモンモード電流の規制値を満足するように、本発明装置が自己の送信系回路１から送信される差動送信信号（第１差動送信信号）の出力特性（出力電力）の調整を行う。尚、当該調整手順としては、規制内容や通信方式に依存して幾つかの方式が存在し得る。初期調整が一旦完了すると、使用する通信プロトコルに則った実際のデータ送受信が、上記調整手順により調整された出力特性を備えた差動送信信号を用いて、通常通りに開始される。   First, as a general flow, when the apparatus of the present invention is started, the apparatus of the present invention is self-contained so as to satisfy the regulation value of the common mode current determined for the frequency band used at the place of use of the apparatus of the present invention. The output characteristic (output power) of the differential transmission signal (first differential transmission signal) transmitted from the transmission system circuit 1 is adjusted. As the adjustment procedure, there may be several methods depending on the regulation contents and the communication method. Once the initial adjustment is completed, actual data transmission / reception in accordance with the communication protocol to be used is started as usual using a differential transmission signal having an output characteristic adjusted by the adjustment procedure.

次に、マルチキャリア通信方式における上記調整手順の一例について、図２を参照して説明する。ここで、各キャリアが適度に線形性を保持している場合を想定して、以下に示す調整手順の各工程がキャリア毎に独立して実行されるものとする。尚、各キャリアが適度に線形性を保持していない場合は、以下の手順を発展させて適用することになる。   Next, an example of the adjustment procedure in the multicarrier communication system will be described with reference to FIG. Here, assuming that each carrier has moderate linearity, each step of the adjustment procedure shown below is executed independently for each carrier. In addition, when each carrier does not maintain the linearity appropriately, the following procedure is developed and applied.

第１ステップとして、任意に設定された初期特性に基づいて送信系回路１から差動信号結合装置４を介して１対のワイヤ線路７上に差動送信信号を出力する（＃１００）。同時に、マイクロコントローラ３が、入力切替手段６に対する制御により、コモンモード電流検出手段５の検出出力を受信系回路２に入力可能に設定し、受信系回路２が当該検出出力を処理して、１対のワイヤ線路７上に発生したコモンモード電流を推定する（＃１０２）。コモンモード電流の推定は、コモンモード電流検出手段５の検出出力に基づいて、マイクロコントローラ３からの制御によって当該検出出力を高信頼度で摘出可能に設定された受信系回路２の所定の回路の特性またはゲインを考慮して、実行される。マイクロコントローラ３による受信系回路２に対する制御には、受信系回路２の各回路に回路状態の抽出も含まれる。当該コモンモード電流の推定処理には、対象となる規制内容に応じて、コモンモード電流の平均値、尖頭値、準尖頭値、及び、その他の統計値等の他の特性値を抽出する計算処理が含まれる。   As a first step, a differential transmission signal is output from the transmission system circuit 1 to the pair of wire lines 7 via the differential signal coupling device 4 based on an arbitrarily set initial characteristic (# 100). At the same time, the microcontroller 3 controls the input switching means 6 to set the detection output of the common mode current detection means 5 to be input to the reception system circuit 2, and the reception system circuit 2 processes the detection output, A common mode current generated on the pair of wire lines 7 is estimated (# 102). The estimation of the common mode current is based on the detection output of the common mode current detection means 5 based on the detection circuit of a predetermined circuit of the reception system circuit 2 which is set to be able to extract the detection output with high reliability by the control from the microcontroller 3. It is executed in consideration of characteristics or gain. The control of the reception system circuit 2 by the microcontroller 3 includes extraction of the circuit state of each circuit of the reception system circuit 2. In the process of estimating the common mode current, other characteristic values such as an average value, a peak value, a quasi-peak value, and other statistical values of the common mode current are extracted in accordance with the target regulation content. Calculation processing is included.

次に、マイクロコントローラ３は、コモンモード電流の推定値（導出特性値に相当）を最大許容値（基準値に相当）と比較する（＃１０４）。ここで、コモンモード電流の推定値が、コモンモード電流の許容範囲（最大許容値）を超過している場合には（＃１０４のＹＥＳ分岐）、マイクロコントローラ３は、送信系回路１に対して差動送信信号の送信出力を低下させる制御を行う（＃１０６）。ここで、差動送信信号の送信出力の低下量を決定する方法としては、対象となる規制内容や可能な設計選択肢等の条件に応じて幾つかの方法が考えられる。また、コモンモード電流の推定値が、コモンモード電流の最大許容値以下である場合には（＃１０４のＮＯ分岐）、差動送信信号の送信出力は更に増大できる可能性がある。そこで、ステップ＃１０４で、コモンモード電流の推定値が最大許容値以下であると判定された場合には、コモンモード電流の推定値が最大許容値に対して相当程度下回っているか否かの第２の判定を行う（＃１０８）。ここで、コモンモード電流の推定値と最大許容値の差分が所定値以下の場合には（＃１０８のＮＯ分岐）、一連の調整処理を終了する（＃１１２）。第２の判定において、上記所定値を設けることで、コモンモード電流の推定誤差に対するマージンが与えられる。第２の判定で、コモンモード電流の推定値と最大許容値の差分が所定値を超過している場合には（＃１０８のＹＥＳ分岐）、マイクロコントローラ３は、送信系回路１に対して差動送信信号の送信出力を増大させる制御を行う（＃１１０）。ここで、差動送信信号の送信出力の増大量を決定する方法としては、対象となる規制内容や可能な設計選択肢等の条件に応じて幾つかの方法が考えられる。尚、第２の判定に使用する所定値は、設計パラメータである。以上のステップ＃１０２〜＃１１０は、一連の調整処理が終了する（＃１１２）まで、繰り返される。   Next, the microcontroller 3 compares the estimated value of the common mode current (corresponding to the derived characteristic value) with the maximum allowable value (corresponding to the reference value) (# 104). Here, when the estimated value of the common mode current exceeds the allowable range (maximum allowable value) of the common mode current (YES branch of # 104), the microcontroller 3 Control to reduce the transmission output of the differential transmission signal is performed (# 106). Here, as a method of determining the amount of decrease in the transmission output of the differential transmission signal, several methods are conceivable depending on conditions such as the subject regulation content and possible design options. If the estimated value of the common mode current is equal to or less than the maximum allowable value of the common mode current (# 104 NO branch), the transmission output of the differential transmission signal may be further increased. Therefore, if it is determined in step # 104 that the estimated value of the common mode current is less than or equal to the maximum allowable value, it is determined whether the estimated value of the common mode current is considerably lower than the maximum allowable value. 2 is determined (# 108). Here, when the difference between the estimated value of the common mode current and the maximum allowable value is equal to or smaller than the predetermined value (NO branch of # 108), the series of adjustment processing is ended (# 112). In the second determination, a margin for the estimation error of the common mode current is given by providing the predetermined value. When the difference between the estimated value of the common mode current and the maximum allowable value exceeds the predetermined value in the second determination (YES branch of # 108), the microcontroller 3 makes a difference with respect to the transmission system circuit 1. Control to increase the transmission output of the dynamic transmission signal is performed (# 110). Here, as a method of determining the increase amount of the transmission output of the differential transmission signal, several methods are conceivable depending on conditions such as the target regulation contents and possible design options. The predetermined value used for the second determination is a design parameter. The above steps # 102 to # 110 are repeated until a series of adjustment processing ends (# 112).

図２に例示した調整手順は、例えば、コモンモード電流の平均値や尖頭値等の複数の特性値に対して同時に満足すべき個々の規制範囲が規定されている場合に対して、明らかな変更を加えて簡単に拡張することができる。更に、図２に例示した調整手順のステップ＃１０６及び＃１１０において、差動送信信号の送信出力の低下量または増大量を決定する方法として、上述の如く、種々の異なる方法が可能である。   The adjustment procedure illustrated in FIG. 2 is obvious when, for example, individual regulation ranges to be satisfied simultaneously are defined for a plurality of characteristic values such as an average value and a peak value of a common mode current. Can be easily extended with changes. Furthermore, as described above, various different methods are possible as methods for determining the amount of decrease or increase in the transmission output of the differential transmission signal in steps # 106 and # 110 of the adjustment procedure illustrated in FIG.

図２に例示した調整手順の一実施例において、第１ステップ（＃１００）で、差動送信信号の全周波数帯域において、最初に出力する差動送信信号の電力として非常に小電力を用いる。そして、ステップ＃１０２、＃１０４、＃１０８、＃１１０を経由して、第２の判定（＃１０８）で、コモンモード電流の推定値と最大許容値の差分が所定値以下と判定されるまで、徐々に差動送信信号の電力を増大させる。ここで、ステップ＃１１０での差動送信信号の送信出力の増大量は、コモンモード電流の推定値が最大許容値に近づくに従い、減少させる。斯かる手順により、コモンモード電流の推定値は、常時最大許容値以下に維持される。本実施例では、ステップ＃１０６は実行されない。   In one embodiment of the adjustment procedure illustrated in FIG. 2, in the first step (# 100), very low power is used as the power of the differential transmission signal to be output first in the entire frequency band of the differential transmission signal. Then, through steps # 102, # 104, # 108, and # 110, until the second determination (# 108) determines that the difference between the estimated common mode current value and the maximum allowable value is equal to or less than a predetermined value. Gradually increase the power of the differential transmission signal. Here, the increase amount of the transmission output of the differential transmission signal in step # 110 is decreased as the estimated value of the common mode current approaches the maximum allowable value. With such a procedure, the estimated value of the common mode current is always maintained below the maximum allowable value. In this embodiment, step # 106 is not executed.

図２に例示した調整手順の他の実施例において、ステップ＃１０６及び＃１１０において、処理手順を早く収束させるために、差動送信信号の送信出力の低下量及び増大量の夫々の初期値を大きく設定する。そして、２回目以降のステップ＃１０６及び＃１１０において、差動送信信号の送信出力を微調整するために、低下量及び増大量を小さくする。   In another embodiment of the adjustment procedure illustrated in FIG. 2, in steps # 106 and # 110, in order to quickly converge the processing procedure, respective initial values of the decrease amount and increase amount of the transmission output of the differential transmission signal are set. Set larger. In the second and subsequent steps # 106 and # 110, the decrease amount and the increase amount are reduced in order to finely adjust the transmission output of the differential transmission signal.

図２に例示した調整手順の更に他の実施例において、第１ステップ（＃１００）で、差動送信信号の全周波数帯域において、最初に出力する差動送信信号の電力として同時に適用される規制内容で定められている差動送信信号の最大許容値（基準レベルに相当）を用いる。第２の判定（＃１０８）は、意図的に調整手順を終了させるために無効化する。つまり、第１の判定（＃１０４）で、コモンモード電流の推定値が、コモンモード電流の最大許容値以下である場合には、一連の調整処理を終了する（＃１１２）。本実施例では、第１の判定（＃１０４）で、コモンモード電流の推定値が、コモンモード電流の許容範囲（最大許容値）を超過している場合には（＃１０４のＹＥＳ分岐）、マイクロコントローラ３は、送信系回路１に対して差動送信信号の送信出力を低下させる制御を行い（＃１０６）、ステップ＃１０２、＃１０４、＃１０６が、第１の判定（＃１０４）で、コモンモード電流の推定値が、コモンモード電流の最大許容値以下となるまで、繰り返される。当該調整手順によって、差動送信信号自体が規制されている場合に、差動送信信号の出力特性が規制値を超過するのを防止できる。   In still another embodiment of the adjustment procedure illustrated in FIG. 2, in the first step (# 100), the restriction applied simultaneously as the power of the differential transmission signal to be output first in all frequency bands of the differential transmission signal. The maximum allowable value (corresponding to the reference level) of the differential transmission signal defined in the contents is used. The second determination (# 108) is invalidated to intentionally end the adjustment procedure. That is, if the estimated value of the common mode current is equal to or less than the maximum allowable value of the common mode current in the first determination (# 104), the series of adjustment processing is terminated (# 112). In the present embodiment, when the estimated value of the common mode current exceeds the allowable range (maximum allowable value) of the common mode current in the first determination (# 104) (YES branch of # 104), The microcontroller 3 controls the transmission system circuit 1 to reduce the transmission output of the differential transmission signal (# 106), and steps # 102, # 104, and # 106 are the first determination (# 104). This is repeated until the estimated value of the common mode current is equal to or less than the maximum allowable value of the common mode current. By the adjustment procedure, when the differential transmission signal itself is regulated, it is possible to prevent the output characteristics of the differential transmission signal from exceeding the regulation value.

図２に例示した調整手順の更なる他の実施例において、第１ステップ（＃１００）で、１回目の差動送信信号を出力し、ステップ＃１０６または＃１１０に至った場合に、マイクロコントローラ３は、コモンモード電流が差動送信信号の送信電力に比例して変化するという仮定に基づいて、コモンモード電流の推定値と１回目の差動送信信号の送信電力を用いて、差動送信信号の送信出力の低下量または増大量を推定し、推定された低下量または増大量に基づいて差動送信信号の送信電力の調整を行う。当該処理手順によれば、ステップ＃１０６、＃１１０の送信電力の調整工程は何れか一方が１回だけ実行され、繰り返されることはないので、調整処理の処理時間を大幅に短縮できる。   In still another embodiment of the adjustment procedure illustrated in FIG. 2, in the first step (# 100), when the first differential transmission signal is output and step # 106 or # 110 is reached, the microcontroller 3 is based on the assumption that the common mode current changes in proportion to the transmission power of the differential transmission signal, and uses the estimated value of the common mode current and the transmission power of the first differential transmission signal to perform differential transmission. The amount of decrease or increase in signal transmission output is estimated, and the transmission power of the differential transmission signal is adjusted based on the estimated amount of decrease or increase. According to the processing procedure, either one of the transmission power adjustment steps of steps # 106 and # 110 is executed only once and is not repeated, so that the processing time of the adjustment processing can be greatly shortened.

以上の代表的な実施例から、特定の状況や設計要望等に適合するための多くの他の実施例を派生することができる。次に、コモンモード電流と差動送信信号の送信出力の両方に対して複数の規制が適用される場合の簡単化された実施例について、図３を参照して詳細に説明する。本実施例では、コモンモード電流が平均値と尖頭値の両方で規制されており、差動送信信号が平均電力で規制されている場合を想定して説明する。   From the above exemplary embodiments, many other embodiments can be derived to suit a particular situation, design needs, etc. Next, a simplified embodiment where a plurality of restrictions are applied to both the common mode current and the transmission output of the differential transmission signal will be described in detail with reference to FIG. In the present embodiment, description will be made assuming that the common mode current is regulated by both the average value and the peak value, and the differential transmission signal is regulated by the average power.

第１ステップとして、全ての規制値が満足されるように微小電力に初期設定された差動送信信号を、送信系回路１から差動信号結合装置４を介して１対のワイヤ線路７上に出力する（＃２００）。ここで、差動送信信号の電力増加パラメータ（電力増加率または電力増加量）αを、所定の初期値に設定する。   As a first step, a differential transmission signal initially set to a minute power so that all the regulation values are satisfied is transferred from the transmission system circuit 1 to the pair of wire lines 7 via the differential signal coupling device 4. Output (# 200). Here, the power increase parameter (power increase rate or power increase amount) α of the differential transmission signal is set to a predetermined initial value.

同時に、マイクロコントローラ３が、入力切替手段６に対する制御により、コモンモード電流検出手段５の検出出力を受信系回路２に入力可能に設定し、受信系回路２が当該検出出力を処理して、１対のワイヤ線路７上に発生したコモンモード電流の平均値と尖頭値を推定する（＃２０２）。次に、マイクロコントローラ３は、コモンモード電流の推定値（平均値と尖頭値）を夫々の最大許容値と比較する（＃２０４）。ここで、コモンモード電流の全ての推定値（平均値と尖頭値）が、夫々対応する最大許容値以下である場合には（＃２０４のＮＯ分岐）、コモンモード電流の各推定値が個々の最大許容値に対して相当程度下回っているか否かの第２の判定を行う（＃２０８）。ここで、コモンモード電流の各推定値（平均値、尖頭値）と対応する最大許容値の差分の何れか一方が所定値以下の場合には（＃２０８のＮＯ分岐）、一連の調整処理を終了する（＃２１８）。第２の判定で、コモンモード電流の各推定値（平均値、尖頭値）と対応する最大許容値の差分が両方とも所定値を超過している場合には（＃２０８のＹＥＳ分岐）、電力増加パラメータαで差動送信信号の送信電力を増加させた場合に、平均電力が最大許容値を超過しないか否かの第３の判定を行う（＃２１０）。第３の判定で、平均電力が最大許容値を超過しない場合には（＃２１０のＹＥＳ分岐）、現状の電力増加パラメータαで差動送信信号の送信電力を増加させる（＃２１２）。第３の判定で、平均電力が最大許容値を超過する場合、つまり、電力増加パラメータαが大き過ぎる場合には（＃２１０のＮＯ分岐）、電力増加パラメータαを減少させ（＃２１４）、減少させた電力増加パラメータαが電力増加パラメータαの下限値αｍｉｎより小さいか否かの第４の判定を行う（＃２１６）。第４の判定で、減少させた電力増加パラメータαが所定の下限値αｍｉｎより小さい場合（＃２１６のＹＥＳ分岐）、差動送信信号の送信電力の増加が不可能と判断して、一連の調整処理を終了する（＃２１８）。第４の判定で、減少させた電力増加パラメータαが下限値αｍｉｎ以上の場合は（＃２１６のＮＯ分岐）、ステップ＃２１０に戻って第３の判定を再度行う。   At the same time, the microcontroller 3 controls the input switching means 6 to set the detection output of the common mode current detection means 5 to be input to the reception system circuit 2, and the reception system circuit 2 processes the detection output, The average value and peak value of the common mode current generated on the pair of wire lines 7 are estimated (# 202). Next, the microcontroller 3 compares the estimated values (average value and peak value) of the common mode current with respective maximum allowable values (# 204). Here, when all the estimated values (average value and peak value) of the common mode current are not more than the corresponding maximum allowable values (NO branch of # 204), each estimated value of the common mode current is individually A second determination is made as to whether or not the maximum allowable value is considerably below (# 208). Here, when any one of the differences between the estimated values (average value, peak value) of the common mode current and the corresponding maximum allowable value is equal to or smaller than a predetermined value (NO branch of # 208), a series of adjustment processes Is finished (# 218). In the second determination, when the difference between each estimated value (average value, peak value) of the common mode current and the corresponding maximum allowable value exceeds both predetermined values (YES branch of # 208), When the transmission power of the differential transmission signal is increased with the power increase parameter α, a third determination is made as to whether the average power does not exceed the maximum allowable value (# 210). If the average power does not exceed the maximum allowable value in the third determination (# 210 YES branch), the transmission power of the differential transmission signal is increased by the current power increase parameter α (# 212). If the average power exceeds the maximum allowable value in the third determination, that is, if the power increase parameter α is too large (NO branch of # 210), the power increase parameter α is decreased (# 214) and decreased. A fourth determination is made as to whether or not the increased power increase parameter α is smaller than the lower limit αmin of the increased power parameter α (# 216). In the fourth determination, if the decreased power increase parameter α is smaller than the predetermined lower limit αmin (# 216 YES branch), it is determined that the transmission power of the differential transmission signal cannot be increased, and a series of adjustments are performed. The process ends (# 218). In the fourth determination, when the decreased power increase parameter α is equal to or greater than the lower limit αmin (NO branch of # 216), the process returns to step # 210 and the third determination is performed again.

ここで、図３に例示する処理手順におけるステップ＃２０４とステップ＃２０８の間の通過点（＃２２０）では、コモンモード電流と差動送信信号の送信出力の両方に対する全ての規制値が満足されている点が注目される。第１の判定が正の場合、つまり、コモンモード電流の少なくとも何れか一方の推定値（平均値、尖頭値）が、対応する最大許容値より大きい場合（＃２０４のＹＥＳ分岐）、差動送信信号の送信出力が増大され過ぎて、コモンモード電流の推定値が最大許容値を超過している。本実施例では、当該状況を是正するために、差動送信信号の送信出力を電力増加パラメータαの半分に対応する低下量で低下させ、つまり、電力増加前の差動送信信号の送信出力との中間値まで低下させ、同時に、電力増加パラメータαを半分に設定する（＃２０６）。その後、ステップ＃２０２に戻って、ステップ＃２０２以降の工程を繰り返す。この結果、コモンモード電流の複数の推定値が、夫々に対応する最大許容値を満足するように、差動送信信号の送信出力が抑制される。第１の判定（＃２０４）において、コモンモード電流の複数の特性値の内の１つの特性値が、他の特性値より、最大許容値（規定範囲）による抑圧度が大きい場合、つまり、最大許容値に対する超過度が大きい場合は、結果として、当該抑圧度（超過度）が大きい特性値が最大許容値を満足するように差動送信信号の送信出力が抑制される。   Here, at the passing point (# 220) between step # 204 and step # 208 in the processing procedure illustrated in FIG. 3, all the regulation values for both the common mode current and the transmission output of the differential transmission signal are satisfied. It is noted that. If the first determination is positive, that is, if the estimated value (average value, peak value) of at least one of the common mode currents is larger than the corresponding maximum allowable value (YES branch of # 204), differential The transmission output of the transmission signal is increased too much, and the estimated value of the common mode current exceeds the maximum allowable value. In this embodiment, in order to correct the situation, the transmission output of the differential transmission signal is reduced by a reduction amount corresponding to half of the power increase parameter α, that is, the transmission output of the differential transmission signal before the power increase and At the same time, the power increase parameter α is set to half (# 206). Then, it returns to step # 202 and repeats the process after step # 202. As a result, the transmission output of the differential transmission signal is suppressed so that the plurality of estimated values of the common mode current satisfy the corresponding maximum allowable values. In the first determination (# 204), when one characteristic value of the plurality of characteristic values of the common mode current has a greater degree of suppression by the maximum allowable value (specified range) than the other characteristic values, that is, the maximum When the excess degree with respect to the allowable value is large, as a result, the transmission output of the differential transmission signal is suppressed so that the characteristic value with the large degree of suppression (excess degree) satisfies the maximum allowable value.

図４に、図２または図３に例示するような調整手順による差動送信信号の送信出力の調整前後の、差動送信信号の電力スペクトル密度（Ｐｏｗｅｒ Ｓｐｅｃｔｒｕｍ Ｄｅｎｓｉｔｙ：ＰＳＤ）を、模式的に示す。尚、図４の例示では、調整前のＰＳＤは動作周波数帯域内（Ｆｍｉｎ〜Ｆｍａｘ）で平坦である。図４に示すように、差動送信信号の送信出力の調整によって、ある周波数域（４００，４０２）では、差動送信信号の送信出力が増大し、別の周波数域（４０４，４０６）では、差動送信信号の送信出力が低下している。図４に示す差動送信信号の送信出力の調整に対応して、図５に模式的に示すように、コモンモード電流（図中点線で表示）が、コモンモード電流の許容値（図中破線で表示）を、全ての周波数帯域で満足するようになる。   FIG. 4 schematically shows the power spectrum density (PSD) of the differential transmission signal before and after adjustment of the transmission output of the differential transmission signal by the adjustment procedure illustrated in FIG. 2 or FIG. . In the illustration of FIG. 4, the PSD before adjustment is flat within the operating frequency band (Fmin to Fmax). As shown in FIG. 4, by adjusting the transmission output of the differential transmission signal, the transmission output of the differential transmission signal increases in one frequency range (400, 402), and in another frequency range (404, 406), The transmission output of the differential transmission signal is reduced. Corresponding to the adjustment of the transmission output of the differential transmission signal shown in FIG. 4, as schematically shown in FIG. 5, the common mode current (indicated by a dotted line in the figure) is an allowable value of the common mode current (dashed line in the figure). Will be satisfied in all frequency bands.

以上、本発明装置について詳細に説明したが、注目すべき点は、本発明装置の受信系回路２は、本発明装置の送信系回路１における差動送信信号の送信出力の電力または電力スペクトル密度の調整によって、何らの不利な影響を受けないことである。これは、受信系回路２からは、差動送信信号の特性変化は、通信線路のランダムな影響（例えば、ワイヤ線路７上の信号レベルの周波数選択的な減衰）として見られるからである。即ち、差動送信信号の送信出力の電力または電力スペクトル密度の調整が一旦なされると、送信系回路１は通常のデータ送信を開始できる。本発明装置において、受信系回路２には送信系回路１に対するような調整が含まれないので、本発明装置における上記調整方法や調整性能は受信系回路２の影響を受けない。従って、共通のワイヤ線路７上に接続する、他の本発明装置の送信系回路において、差動送信信号の送信出力の電力または電力スペクトル密度の調整が行われ最適化されると、通常の受信動作において、各モデム装置の受信系回路では、より高品質な差動受信信号を受信できるようになり、例えば、ビットレート等の通信品質の向上が図れる。   Although the present invention apparatus has been described in detail above, it should be noted that the reception system circuit 2 of the present invention apparatus has the power or power spectral density of the transmission output of the differential transmission signal in the transmission system circuit 1 of the present invention apparatus. It is not adversely affected by the adjustment. This is because, from the reception system circuit 2, the characteristic change of the differential transmission signal is seen as a random influence of the communication line (for example, frequency selective attenuation of the signal level on the wire line 7). That is, once the power or power spectral density of the transmission output of the differential transmission signal is adjusted, the transmission system circuit 1 can start normal data transmission. In the apparatus of the present invention, the reception system circuit 2 does not include adjustments as to the transmission system circuit 1, so that the adjustment method and adjustment performance in the apparatus of the present invention are not affected by the reception system circuit 2. Therefore, in the transmission system circuit of another device of the present invention connected on the common wire line 7, when the power or power spectral density of the transmission output of the differential transmission signal is adjusted and optimized, normal reception is performed. In operation, the reception system circuit of each modem device can receive a higher-quality differential reception signal, and, for example, communication quality such as bit rate can be improved.

以下、本発明の別実施形態について説明する。   Hereinafter, another embodiment of the present invention will be described.

〈１〉上記実施形態では、差動送信信号の送信出力の調整時において、１対のワイヤ線路７上に出力される差動送信信号については、出力特性以外の信号属性については制限を設けていなかったが、当該差動送信信号が、同じワイヤ線路７上に接続する他のモデム装置によって受信されない調整専用の擬似的な差動送信信号を用いるのも好ましい。当該調整専用の擬似的な差動送信信号を用いることで、本発明装置が、差動送信信号の送信出力の調整中において、他のモデム装置が、本発明装置から送信された差動送信信号を受信することで、初期化処理や、本発明装置との通信接続の確立を試みる無駄を防止できる。   <1> In the above embodiment, when adjusting the transmission output of the differential transmission signal, the differential transmission signal output on the pair of wire lines 7 is limited for signal attributes other than the output characteristics. However, it is also preferable to use a pseudo differential transmission signal dedicated for adjustment that is not received by another modem device connected on the same wire line 7. By using the pseudo differential transmission signal dedicated to the adjustment, while the device of the present invention is adjusting the transmission output of the differential transmission signal, another modem device transmits the differential transmission signal transmitted from the device of the present invention. By receiving this, it is possible to prevent the initialization process and waste of trying to establish a communication connection with the device of the present invention.

更に、本発明装置の起動時において、差動送信信号の送信出力の初期の調整用に長い調整期間を設定することも可能である。１対のワイヤ線路７上の本発明装置が、当該調整期間中に差動送信信号の送信出力の調整を行っている場合は、受信系回路２がコモンモード電流検出手段５の検出出力を入力し、他のモデム装置からの差動信号を受信しない構成となっているので、１対のワイヤ線路７上の他のモデム装置が、初期調整中の本発明装置に対して通信接続を試みても、本発明装置は当該通信接続確立用のパケットデータを受信することはない。従って、当該調整期間中には、本発明装置は、通信接続を試みる他のモデム装置が誤って判読できない調整専用の擬似的な差動送信信号を使用するのが好ましい。   Furthermore, when the apparatus of the present invention is started, a long adjustment period can be set for the initial adjustment of the transmission output of the differential transmission signal. When the device of the present invention on the pair of wire lines 7 adjusts the transmission output of the differential transmission signal during the adjustment period, the reception system circuit 2 inputs the detection output of the common mode current detection means 5 However, since the differential signal from the other modem device is not received, the other modem device on the pair of wire lines 7 tries to establish communication connection with the device of the present invention which is being initially adjusted. However, the device of the present invention does not receive the packet data for establishing the communication connection. Therefore, during the adjustment period, it is preferable that the device of the present invention uses a pseudo differential transmission signal dedicated for adjustment that cannot be misread by other modem devices attempting communication connection.

しかし、調整専用の擬似的な差動送信信号は、考慮すべき規制に該当するプロトコル信号の特性値に合致する必要がある。例えば、尖頭値や準尖頭値等の特性値が規制されている場合には、上記条件が重要となる。当該特性値は、変調方式等の信号属性に直接的に依存するため、調整専用の擬似的な差動送信信号の特性を、上記プロトコル信号の特性値を模擬できるように、慎重に設計しなければならない。具体的には、調整専用の擬似的な差動送信信号の１または複数の所定の統計値が、モデム装置間で送受信される通常の差動送信信号における当該所定の統計値と近似するように、調整専用の擬似的な差動送信信号をランダムに送信する。   However, the pseudo differential transmission signal dedicated for adjustment needs to match the characteristic value of the protocol signal corresponding to the regulation to be considered. For example, the above condition is important when characteristic values such as peak value and quasi-peak value are regulated. Since the characteristic value directly depends on the signal attribute such as the modulation method, the characteristics of the pseudo differential transmission signal dedicated for adjustment must be carefully designed so that the characteristic value of the protocol signal can be simulated. I must. Specifically, one or a plurality of predetermined statistical values of the pseudo differential transmission signal dedicated for adjustment are approximated to the predetermined statistical values in a normal differential transmission signal transmitted and received between modem devices. The pseudo differential transmission signal dedicated for adjustment is randomly transmitted.

〈２〉更に、本発明装置の好適な応用例としては、共通のワイヤ線路７上に接続する複数の本発明装置が、起動時または通常動作開始前において夫々独立して、たとえ他のモデム装置に対して送信すべきデータがない状態であっても、上記差動送信信号の送信出力の電力または電力スペクトル密度の調整を行う。更に、好適な調整手順は、上記〈１〉に説明したような他のモデム装置との通信を行わないシングルエンド型であるため、起動時において速やかに調整動作を開始できる。   <2> Further, as a preferable application example of the device of the present invention, a plurality of the devices of the present invention connected on the common wire line 7 may be independently connected at the start-up or before the start of normal operation. Even when there is no data to be transmitted, the power or power spectral density of the transmission output of the differential transmission signal is adjusted. Furthermore, since the preferred adjustment procedure is a single-ended type that does not communicate with other modem devices as described in <1> above, the adjustment operation can be quickly started at the time of startup.

〈３〉コモンモード電流特性は、時間の経過とともに変化する場合がある。例えば、本発明装置の送信系回路１における温度変動に起因して、緩やかな特性変動が起こる一方で、例えば、ワイヤ線路７への新たな機器の接続或いはワイヤ線路７に接続している既存機器の取り外し等による線路インピーダンスの変動を伴うワイヤ線路７の構成の変化によって急激な特性変動が起こる。   <3> The common mode current characteristics may change over time. For example, while a gradual characteristic fluctuation occurs due to a temperature fluctuation in the transmission system circuit 1 of the present invention device, for example, a new device is connected to the wire line 7 or an existing device connected to the wire line 7. A sudden characteristic change occurs due to a change in the configuration of the wire line 7 accompanied by a change in the line impedance due to the removal of the wire.

上記実施形態では、差動送信信号の送信出力の電力または電力スペクトル密度の調整は、起動時または通常動作開始前において１回行う場合を想定して説明したが、初期調整後においても、上記コモンモード電流特性の変動に適切に対応して、コモンモード電流を常時規制範囲内に収めるために、当該特性変動を監視して、適時に差動送信信号の送信出力の電力または電力スペクトル密度の調整を行うのも好ましい実施形態である。   In the embodiment described above, the adjustment of the power or power spectral density of the transmission output of the differential transmission signal has been described on the assumption that it is performed once at the time of start-up or before the start of normal operation. In order to keep the common mode current within the regulated range by appropriately responding to fluctuations in the mode current characteristics, the characteristic fluctuations are monitored and the power or power spectral density of the differential transmission signal is adjusted in a timely manner. Is also a preferred embodiment.

この場合、本発明装置は、受信系回路２の通常の受信動作が停止状態となると、マイクロコントローラ３が、入力切替手段６に対する制御により、コモンモード電流検出手段５の検出出力を受信系回路２に入力可能に設定し、受信系回路２が当該検出出力を処理して、コモンモード電流の推定値に基づいて、コモンモード電流特性の変動の有無を判定し、判定結果に基づいて、再調整が必要な場合には、上記した要領で差動送信信号の送信出力の再調整を実行する。   In this case, in the device of the present invention, when the normal reception operation of the reception system circuit 2 is stopped, the microcontroller 3 controls the input switching unit 6 to output the detection output of the common mode current detection unit 5 to the reception system circuit 2. The reception system circuit 2 processes the detection output, determines whether there is a change in the common mode current characteristic based on the estimated value of the common mode current, and re-adjusts based on the determination result Is required, the transmission output of the differential transmission signal is readjusted as described above.

使用する通信方式の特性に依存するが、コモンモード電流特性の変動監視のスケジュールは十分に設定することができる。例えば、時分割多重方式の場合では、送信系回路１がデータ送信時においても、常時コモンモード電流特性の変動監視が可能である。他の通信方式でも、変動監視のスケジュール、或いは、通常の受信動作に影響を与えずに変動監視可能なタイミングの検知に対して、様々な手法が使用できる。   Although it depends on the characteristics of the communication method used, the schedule for monitoring the fluctuation of the common mode current characteristics can be set sufficiently. For example, in the case of the time division multiplexing method, even when the transmission system circuit 1 transmits data, it is possible to always monitor the variation of the common mode current characteristic. In other communication methods, various methods can be used for detection of the timing of fluctuation monitoring without affecting the schedule of fluctuation monitoring or normal reception operation.

ここで、注目すべきは、コモンモード電流特性の変動監視は、差動送信信号の送信出力の調整とは異なり、調整専用の差動送信信号ではなく、実際のデータ送信に用いる差動送信信号を用いて実行できる点である。   Here, it should be noted that the fluctuation monitoring of the common mode current characteristic is different from the adjustment of the transmission output of the differential transmission signal, and is not a differential transmission signal dedicated for adjustment but a differential transmission signal used for actual data transmission. It can be executed using.

更に、差動送信信号の送信出力の再調整を開始する前に、共通のワイヤ線路７に接続している他のモデム装置に対して、差動送信信号の送信出力の調整を開始する旨の上位のプロトコルレベルメッセージを送信する制御を行うのも好ましい実施形態である。これにより、差動送信信号の送信出力の再調整が要求される場合に、他のモデム装置との間の通信接続が切断されるのを防止できる。尚、最後の手段としては、通信接続を切断し両側のモデム装置の通信接続の再初期化を効率的に行うことで、本発明装置は独立して差動送信信号の送信出力の再調整を行える。   Furthermore, before starting the readjustment of the transmission output of the differential transmission signal, the adjustment of the transmission output of the differential transmission signal is started with respect to another modem device connected to the common wire line 7. It is also a preferred embodiment to control to send higher protocol level messages. Thereby, when readjustment of the transmission output of a differential transmission signal is requested | required, it can prevent that the communication connection between other modem apparatuses is cut | disconnected. As a last resort, the present invention device can independently readjust the transmission output of the differential transmission signal by cutting off the communication connection and efficiently re-initializing the communication connection of the modem devices on both sides. Yes.

本発明は、有線通信モデム装置に利用可能であり、特に、モデム装置の送信系回路によって１対のワイヤ線路の夫々に対して差動駆動して送信される差動送信信号の出力特性をコモンモード電流に対する規制や制限に適応するように調整可能な有線通信モデム装置に有用である。   INDUSTRIAL APPLICABILITY The present invention can be used for a wired communication modem device. In particular, the output characteristics of a differential transmission signal transmitted by differential driving with respect to each of a pair of wire lines by a transmission system circuit of the modem device are common. The present invention is useful for a wired communication modem apparatus that can be adjusted so as to adapt to regulations and restrictions on mode current.

本発明に係るモデム装置の一実施形態における概略のシステム構成を模式的に示すブロック図1 is a block diagram schematically showing a schematic system configuration in an embodiment of a modem device according to the present invention. 本発明に係るモデム装置の一実施形態における差動送信信号の出力特性の調整手順の一例を示すフローチャートThe flowchart which shows an example of the adjustment procedure of the output characteristic of the differential transmission signal in one Embodiment of the modem apparatus which concerns on this invention 本発明に係るモデム装置の一実施形態における差動送信信号の出力特性の調整手順の他の一例を示すフローチャートThe flowchart which shows another example of the adjustment procedure of the output characteristic of the differential transmission signal in one Embodiment of the modem apparatus which concerns on this invention. 本発明による差動送信信号の出力特性調整前後における差動送信信号の電力スペクトル密度を比較して模式的に示す図The figure which shows typically the comparison of the power spectrum density of the differential transmission signal before and after the output characteristic adjustment of the differential transmission signal by this invention コモンモード電流の初期状態、許容値、本発明による差動送信信号の出力特性調整後の状態を夫々比較して模式的に示す図The figure which shows typically the comparison of the initial state of common mode current, an allowable value, and the state after the output characteristic adjustment of the differential transmission signal by this invention 有線通信モデム装置の送信系回路から差動駆動される１対のワイヤ線路上に誘導されるコモンモード電流を、線路特性が理想的な場合（Ａ）と実際的な場合（Ｂ）を比較して説明する図The common mode current induced on a pair of wire lines that are differentially driven from the transmission system circuit of the wired communication modem device is compared between the case where the line characteristics are ideal (A) and the case where it is practical (B). Figure to explain 従来のモデム装置の概略のシステム構成例を模式的に示すブロック図A block diagram schematically showing an example of a schematic system configuration of a conventional modem device

符号の説明Explanation of symbols

１： 送信系回路
２： 受信系回路
３： マイクロコントローラ（制御回路）
４： 差動信号結合装置
５： コモンモード電流検出手段
６： 入力切替手段
７： １対のワイヤ線路
１１： ＩＦＦＴ回路部（逆高速フーリエ変換処理回路部）
１２： 中間処理部（サイクリックプレフィックスの付加処理等）
１３： ＤＡコンバータ
１４： 増幅器
１５： 駆動回路
２１： 増幅器
２２： フィルタ回路
２３： ＡＤコンバータ
２４： 中間処理部（サイクリックプレフィックスの除去処理）
２５： ＦＦＴ回路部（高速フーリエ変換処理回路部） 1: Transmission system circuit 2: Reception system circuit 3: Microcontroller (control circuit)
4: Differential signal coupling device 5: Common mode current detection means 6: Input switching means 7: A pair of wire lines 11: IFFT circuit section (inverse fast Fourier transform processing circuit section)
12: Intermediate processing part (cyclic prefix addition processing, etc.)
13: DA converter 14: Amplifier 15: Drive circuit 21: Amplifier 22: Filter circuit 23: AD converter 24: Intermediate processing section (cyclic prefix removal processing)
25: FFT circuit (fast Fourier transform processing circuit)

Claims (14)

１対のワイヤ線路を用いて有線通信を行うモデム装置であって、
ディジタルデータを所定のディジタル変調方式で変調した後にアナログ信号に変換して、第１差動送信信号として前記１対のワイヤ線路の夫々に対して差動駆動して送信する送信系回路と、
他のモデム装置から前記１対のワイヤ線路に送信された第２差動送信信号を差動検出した後にディジタル信号に変換して前記ディジタル変調方式に対応する復調方式で復調してディジタルデータを再生する受信系回路と、
前記送信系回路から前記１対のワイヤ線路に送信された前記差動送信信号のコモンモード電流を検出するコモンモード電流検出手段と、
前記受信系回路の入力端で受信された前記第２差動送信信号と前記コモンモード電流検出手段の検出出力を切り替えて、前記受信系回路の前記入力端より後段の回路に入力する入力切替手段と、
前記送信系回路に対して、前記１対のワイヤ線路への前記差動送信信号の送信を行わせ、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えるとともに、前記コモンモード電流の１または複数の特性値が所定の規定範囲内に収まるように、前記受信系回路で処理された前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路により差動駆動される前記第１差動送信信号の出力特性を調整する制御回路と、を備えてなり、
前記制御回路が、前記コモンモード電流検出手段の検出出力を処理して、前記差動送信信号の出力特性に対する調整量を予測するマイクロプロセッサを備えることを特徴とするモデム装置。 A modem device that performs wired communication using a pair of wire lines,
A transmission system circuit that modulates digital data by a predetermined digital modulation method, converts the digital data into an analog signal, and differentially drives and transmits each of the pair of wire lines as a first differential transmission signal;
The second differential transmission signal transmitted from the other modem device to the pair of wire lines is differentially detected, converted to a digital signal, and demodulated by a demodulation method corresponding to the digital modulation method to reproduce the digital data. Receiving system circuit,
Common mode current detection means for detecting a common mode current of the differential transmission signal transmitted from the transmission system circuit to the pair of wire lines;
Input switching means for switching between the second differential transmission signal received at the input terminal of the reception system circuit and the detection output of the common mode current detection means and inputting the signal to a circuit subsequent to the input terminal of the reception system circuit When,
The transmission circuit is caused to transmit the differential transmission signal to the pair of wire lines, the input of the input switching unit is switched to the detection output of the common mode current detection unit, and the common mode Differentially driven by the transmission system circuit according to the detection output of the common mode current detection means processed by the reception system circuit so that one or more characteristic values of the current fall within a predetermined specified range. Ri Na and and a control circuit for adjusting the output characteristics of the first differential transmission signal,
Wherein the control circuit processes the detection output of the common mode current detection means, the modem apparatus according to claim Rukoto a microprocessor for predicting the amount of adjustment for the output characteristics of the differential transmission signal. 前記制御回路が、前記送信系回路に対して、他のモデム装置での受信を誘導しない調整専用の擬似的な差動送信信号を、前記擬似的な差動送信信号の１または複数の所定の統計値が、前記モデム装置間で送受信される通常のデータ信号における前記所定の統計値と近似するように、ランダムに送信させる制御を行うことを特徴とする請求項１に記載のモデム装置。 The control circuit transmits a pseudo-differential transmission signal dedicated for adjustment that does not induce reception by another modem device to the transmission system circuit, and one or a plurality of predetermined pseudo-differential transmission signals. 2. The modem apparatus according to claim 1, wherein control is performed so that a statistical value is randomly transmitted so as to approximate the predetermined statistical value in a normal data signal transmitted and received between the modem apparatuses. １対のワイヤ線路を用いて有線通信を行うモデム装置であって、
ディジタルデータを所定のディジタル変調方式で変調した後にアナログ信号に変換して、第１差動送信信号として前記１対のワイヤ線路の夫々に対して差動駆動して送信する送信系回路と、
他のモデム装置から前記１対のワイヤ線路に送信された第２差動送信信号を差動検出した後にディジタル信号に変換して前記ディジタル変調方式に対応する復調方式で復調してディジタルデータを再生する受信系回路と、
前記送信系回路から前記１対のワイヤ線路に送信された前記差動送信信号のコモンモード電流を検出するコモンモード電流検出手段と、
前記受信系回路の入力端で受信された前記第２差動送信信号と前記コモンモード電流検出手段の検出出力を切り替えて、前記受信系回路の前記入力端より後段の回路に入力する入力切替手段と、
前記送信系回路に対して、前記１対のワイヤ線路への前記差動送信信号の送信を行わせ、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えるとともに、前記コモンモード電流の１または複数の特性値が所定の規定範囲内に収まるように、前記受信系回路で処理された前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路により差動駆動される前記第１差動送信信号の出力特性を調整する制御回路と、を備えてなり、
前記制御回路が、前記送信系回路に対して、他のモデム装置での受信を誘導しない調整専用の擬似的な差動送信信号を、前記擬似的な差動送信信号の１または複数の所定の統計値が、前記モデム装置間で送受信される通常のデータ信号における前記所定の統計値と近似するように、ランダムに送信させる制御を行うことを特徴とするモデム装置。 A modem device that performs wired communication using a pair of wire lines,
A transmission system circuit that modulates digital data by a predetermined digital modulation method, converts the digital data into an analog signal, and differentially drives and transmits each of the pair of wire lines as a first differential transmission signal;
The second differential transmission signal transmitted from the other modem device to the pair of wire lines is differentially detected, converted to a digital signal, and demodulated by a demodulation method corresponding to the digital modulation method to reproduce the digital data. Receiving system circuit,
Common mode current detection means for detecting a common mode current of the differential transmission signal transmitted from the transmission system circuit to the pair of wire lines;
Input switching means for switching between the second differential transmission signal received at the input terminal of the reception system circuit and the detection output of the common mode current detection means and inputting the signal to a circuit subsequent to the input terminal of the reception system circuit When,
The transmission circuit is caused to transmit the differential transmission signal to the pair of wire lines, the input of the input switching unit is switched to the detection output of the common mode current detection unit, and the common mode Differentially driven by the transmission system circuit according to the detection output of the common mode current detection means processed by the reception system circuit so that one or more characteristic values of the current fall within a predetermined specified range. Ri Na and and a control circuit for adjusting the output characteristics of the first differential transmission signal,
The control circuit transmits a pseudo-differential transmission signal dedicated for adjustment that does not induce reception by another modem device to the transmission system circuit, and one or a plurality of predetermined pseudo-differential transmission signals. A modem device, characterized in that control is performed to randomly transmit a statistical value so as to approximate the predetermined statistical value in a normal data signal transmitted and received between the modem devices. 前記コモンモード電流の前記特性値の複数に対して、前記所定の規定範囲が設定されており、その内の１つの前記特性値が、他の前記特性値より、前記規定範囲による抑圧度が大きい場合、前記制御回路が、前記抑圧度の大きい１つの前記特性値が前記規定範囲内に収まるように、前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路から送信される前記差動送信信号の出力特性を調整し、全ての特性値が各別に個々の前記規定範囲内に収まるようにすることを特徴とする請求項１〜３の何れか１項に記載のモデム装置。 The predetermined specified range is set for a plurality of the characteristic values of the common mode current, and one of the characteristic values has a greater degree of suppression by the specified range than the other characteristic values. In this case, the control circuit transmits the difference transmitted from the transmission system circuit in accordance with a detection output of the common mode current detection means so that the one characteristic value having a large degree of suppression falls within the specified range. to adjust the output characteristic of the dynamic transmission signal, the modem apparatus according to any one of claim 1 to 3, characterized in that all the characteristic values to fit within an individual of the specified range in each different. １対のワイヤ線路を用いて有線通信を行うモデム装置であって、
ディジタルデータを所定のディジタル変調方式で変調した後にアナログ信号に変換して、第１差動送信信号として前記１対のワイヤ線路の夫々に対して差動駆動して送信する送信系回路と、
他のモデム装置から前記１対のワイヤ線路に送信された第２差動送信信号を差動検出した後にディジタル信号に変換して前記ディジタル変調方式に対応する復調方式で復調してディジタルデータを再生する受信系回路と、
前記送信系回路から前記１対のワイヤ線路に送信された前記差動送信信号のコモンモード電流を検出するコモンモード電流検出手段と、
前記受信系回路の入力端で受信された前記第２差動送信信号と前記コモンモード電流検出手段の検出出力を切り替えて、前記受信系回路の前記入力端より後段の回路に入力する入力切替手段と、
前記送信系回路に対して、前記１対のワイヤ線路への前記差動送信信号の送信を行わせ、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えるとともに、前記コモンモード電流の１または複数の特性値が所定の規定範囲内に収まるように、前記受信系回路で処理された前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路により差動駆動される前記第１差動送信信号の出力特性を調整する制御回路と、を備えてなり、
前記コモンモード電流の前記特性値の複数に対して、前記所定の規定範囲が設定されており、その内の１つの前記特性値が、他の前記特性値より、前記規定範囲による抑圧度が大きい場合、前記制御回路が、前記抑圧度の大きい１つの前記特性値が前記規定範囲内に収まるように、前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路から送信される前記差動送信信号の出力特性を調整し、全ての特性値が各別に個々の前記規定範囲内に収まるようにすることを特徴とするモデム装置。 A modem device that performs wired communication using a pair of wire lines,
A transmission system circuit that modulates digital data by a predetermined digital modulation method, converts the digital data into an analog signal, and differentially drives and transmits each of the pair of wire lines as a first differential transmission signal;
The second differential transmission signal transmitted from the other modem device to the pair of wire lines is differentially detected, converted to a digital signal, and demodulated by a demodulation method corresponding to the digital modulation method to reproduce the digital data. Receiving system circuit,
Common mode current detection means for detecting a common mode current of the differential transmission signal transmitted from the transmission system circuit to the pair of wire lines;
Input switching means for switching between the second differential transmission signal received at the input terminal of the reception system circuit and the detection output of the common mode current detection means and inputting the signal to a circuit subsequent to the input terminal of the reception system circuit When,
The transmission circuit is caused to transmit the differential transmission signal to the pair of wire lines, the input of the input switching unit is switched to the detection output of the common mode current detection unit, and the common mode Differentially driven by the transmission system circuit according to the detection output of the common mode current detection means processed by the reception system circuit so that one or more characteristic values of the current fall within a predetermined specified range. Ri Na and and a control circuit for adjusting the output characteristics of the first differential transmission signal,
The predetermined specified range is set for a plurality of the characteristic values of the common mode current, and one of the characteristic values has a greater degree of suppression by the specified range than the other characteristic values. In this case, the control circuit transmits the difference transmitted from the transmission system circuit in accordance with a detection output of the common mode current detection means so that the one characteristic value having a large degree of suppression falls within the specified range. to adjust the output characteristic of the dynamic transmission signal, the modem apparatus all characteristic values, wherein to Rukoto to fit within each of the specified range in each different. 前記制御回路が、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えられた場合に、前記受信系回路を構成する少なくとも一部の回路部分または回路素子の特性またはゲインを所定値に設定し、当該所定値に設定された前記特性またはゲインを考慮して、前記第１差動送信信号の出力特性を調整することを特徴とする請求項１〜５の何れか１項に記載のモデム装置。 When the control circuit switches the input of the input switching means to the detection output of the common mode current detection means, the characteristics or gains of at least some circuit parts or circuit elements constituting the reception system circuit are predetermined. set to a value, taking into account the characteristics or gain is set to the predetermined value, to any one of claim 1 to 5, characterized in that to adjust the output characteristic of the first differential transmission signal The modem device described. １対のワイヤ線路を用いて有線通信を行うモデム装置であって、
ディジタルデータを所定のディジタル変調方式で変調した後にアナログ信号に変換して、第１差動送信信号として前記１対のワイヤ線路の夫々に対して差動駆動して送信する送信系回路と、
他のモデム装置から前記１対のワイヤ線路に送信された第２差動送信信号を差動検出した後にディジタル信号に変換して前記ディジタル変調方式に対応する復調方式で復調してディジタルデータを再生する受信系回路と、
前記送信系回路から前記１対のワイヤ線路に送信された前記差動送信信号のコモンモード電流を検出するコモンモード電流検出手段と、
前記受信系回路の入力端で受信された前記第２差動送信信号と前記コモンモード電流検出手段の検出出力を切り替えて、前記受信系回路の前記入力端より後段の回路に入力する入力切替手段と、
前記送信系回路に対して、前記１対のワイヤ線路への前記差動送信信号の送信を行わせ、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えるとともに、前記コモンモード電流の１または複数の特性値が所定の規定範囲内に収まるように、前記受信系回路で処理された前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路により差動駆動される前記第１差動送信信号の出力特性を調整する制御回路と、を備えてなり、
前記制御回路が、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替えられた場合に、前記受信系回路を構成する少なくとも一部の回路部分または回路素子の特性またはゲインを所定値に設定し、当該所定値に設定された前記特性またはゲインを考慮して、前記第１差動送信信号の出力特性を調整することを特徴とするモデム装置。 A modem device that performs wired communication using a pair of wire lines,
A transmission system circuit that modulates digital data by a predetermined digital modulation method, converts the digital data into an analog signal, and differentially drives and transmits each of the pair of wire lines as a first differential transmission signal;
The second differential transmission signal transmitted from the other modem device to the pair of wire lines is differentially detected, converted to a digital signal, and demodulated by a demodulation method corresponding to the digital modulation method to reproduce the digital data. Receiving system circuit,
Common mode current detection means for detecting a common mode current of the differential transmission signal transmitted from the transmission system circuit to the pair of wire lines;
Input switching means for switching between the second differential transmission signal received at the input terminal of the reception system circuit and the detection output of the common mode current detection means and inputting the signal to a circuit subsequent to the input terminal of the reception system circuit When,
The transmission circuit is caused to transmit the differential transmission signal to the pair of wire lines, the input of the input switching unit is switched to the detection output of the common mode current detection unit, and the common mode Differentially driven by the transmission system circuit according to the detection output of the common mode current detection means processed by the reception system circuit so that one or more characteristic values of the current fall within a predetermined specified range. Ri Na and and a control circuit for adjusting the output characteristics of the first differential transmission signal,
When the control circuit switches the input of the input switching means to the detection output of the common mode current detection means, the characteristics or gains of at least some circuit parts or circuit elements constituting the reception system circuit are predetermined. modem apparatus set to a value, taking into account the characteristics or gain is set to the predetermined value, characterized that you adjust the output characteristic of the first differential transmission signal. 前記差動送信信号が、マルチキャリア変調された信号を差動駆動した信号であり、
前記コモンモード電流検出手段が、前記マルチキャリア変調に用いる搬送波の周波数別に、前記差動送信信号のコモンモード電流を検出し、
前記制御回路が、前記周波数別に、前記コモンモード電流の前記特性値が前記周波数別に設定された所定の規定範囲内に収まるように、前記コモンモード電流検出手段の検出出力に応じて、前記送信系回路から送信される前記差動送信信号の出力特性を調整することを特徴とする請求項１〜７の何れか１項に記載のモデム装置。 The differential transmission signal is a signal obtained by differentially driving a multi-carrier modulated signal,
The common mode current detection means detects the common mode current of the differential transmission signal for each frequency of the carrier used for the multicarrier modulation,
In accordance with the detection output of the common mode current detection means, the transmission system is configured so that the characteristic value of the common mode current falls within a predetermined specified range set for each frequency. the modem apparatus according to any one of claims 1-7, characterized in that to adjust the output characteristic of the differential transmission signal transmitted from the circuit. 前記制御回路が、
前記コモンモード電流検出手段の検出出力に基づいて、少なくとも１つの前記特性値を導出する第１処理と、
前記第１処理で導出した導出特性値と、当該特性値の基準値とを比較する第２処理と、
前記導出特性値が前記基準値以下で前記基準値の所定範囲内にあれば、前記差動送信信号の出力特性に対する制御を行わず、前記導出特性値が前記基準値の所定範囲外であれば、前記導出特性値が前記基準値より大きい場合に前記差動送信信号の送信電力を低下させる処理と、前記導出特性値が前記基準値より小さい場合に前記差動送信信号の送信電力を増大させる処理の少なくとも何れか一方を実行する第３処理と、
を実行することを特徴とする請求項１〜８の何れか１項に記載のモデム装置。 The control circuit comprises:
A first process for deriving at least one characteristic value based on a detection output of the common mode current detection means;
A second process for comparing the derived characteristic value derived in the first process with a reference value of the characteristic value;
If the derived characteristic value is equal to or less than the reference value and within the predetermined range of the reference value, the output characteristic of the differential transmission signal is not controlled, and if the derived characteristic value is outside the predetermined range of the reference value The process of reducing the transmission power of the differential transmission signal when the derived characteristic value is larger than the reference value, and the transmission power of the differential transmission signal when the derived characteristic value is smaller than the reference value A third process for executing at least one of the processes;
The modem apparatus according to any one of claims 1-8, characterized in that the run. 前記制御回路が、前記差動送信信号の送信電力を所定の低レベルに設定して前記差動送信信号の出力特性の制御を開始し、前記第３処理において前記差動送信信号の送信電力を徐々に増大させる制御を行い、制御期間中において前記導出特性値を前記基準値以下に維持することを特徴とする請求項９に記載のモデム装置。 The control circuit sets the transmission power of the differential transmission signal to a predetermined low level and starts controlling the output characteristics of the differential transmission signal. In the third process, the transmission power of the differential transmission signal is reduced. The modem apparatus according to claim 9 , wherein control is performed to gradually increase, and the derived characteristic value is maintained below the reference value during a control period. 前記制御回路が、前記差動送信信号の送信電力を所定の基準レベルに設定して前記差動送信信号の出力特性の制御を開始し、前記導出特性値が前記基準値より大きい場合にのみ、前記導出特性値が前記基準値以下となるまで、前記差動送信信号の送信電力を低下させる処理を行うことを特徴とする請求項９に記載のモデム装置。 The control circuit starts the control of the output characteristics of the differential transmission signal by setting the transmission power of the differential transmission signal to a predetermined reference level, and only when the derived characteristic value is larger than the reference value, The modem device according to claim 9 , wherein a process of reducing transmission power of the differential transmission signal is performed until the derived characteristic value becomes equal to or less than the reference value. 前記コモンモード電流の１または複数の前記特性値が、前記コモンモード電流の平均値、尖頭値、準尖頭値、及び、その他の統計値の内の少なくとも何れか１つであることを特徴とする請求項１〜１１の何れか１項に記載のモデム装置。 The one or more characteristic values of the common mode current are at least one of an average value, a peak value, a quasi-peak value, and other statistical values of the common mode current. The modem device according to any one of claims 1 to 11 . 前記第１差動送信信号の出力特性の初期調整後において、前記制御回路が、前記受信系回路が前記第２差動送信信号を受信しない場合に、前記受信系回路が前記コモンモード電流検出手段の検出出力を処理して前記コモンモード電流の前記特性値の変動を監視できるように、前記入力切替手段の入力を前記コモンモード電流検出手段の検出出力に切り替える制御を行うことを特徴とする請求項１〜１２の何れか１項に記載のモデム装置。 After the initial adjustment of the output characteristics of the first differential transmission signal, when the control circuit does not receive the second differential transmission signal, the reception circuit detects the common mode current detection means. The control of switching the input of the input switching means to the detection output of the common mode current detecting means is performed so that the fluctuation of the characteristic value of the common mode current can be monitored by processing the detected output of the common mode current. Item 15. The modem device according to any one of Items 1 to 12 . 前記第１差動送信信号の出力特性の初期調整後において、前記コモンモード電流の前記特性値の変動を検知した場合、前記制御回路が、前記差動送信信号の出力特性の再調整に関するメッセージを他のモデム装置に送信する制御を行うことを特徴とする請求項１３に記載のモデム装置。 After the initial adjustment of the output characteristic of the first differential transmission signal, when detecting a change in the characteristic value of the common mode current, the control circuit sends a message regarding readjustment of the output characteristic of the differential transmission signal. the modem apparatus according to claim 1 3, characterized in that performing control of transmitting to another modem device.
JP2007068561A 2007-03-16 2007-03-16 Modem equipment Expired - Fee Related JP4778463B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007068561A JP4778463B2 (en) 2007-03-16 2007-03-16 Modem equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007068561A JP4778463B2 (en) 2007-03-16 2007-03-16 Modem equipment

Publications (2)

Publication Number Publication Date
JP2008235993A JP2008235993A (en) 2008-10-02
JP4778463B2 true JP4778463B2 (en) 2011-09-21

Family

ID=39908314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007068561A Expired - Fee Related JP4778463B2 (en) 2007-03-16 2007-03-16 Modem equipment

Country Status (1)

Country Link
JP (1) JP4778463B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010050719B4 (en) 2010-11-08 2013-08-22 Fujitsu Technology Solutions Intellectual Property Gmbh Method for adjusting the signal transmission between two electronic devices and arrangement with a computer system and a peripheral device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5991269A (en) * 1998-09-15 1999-11-23 Northern Telecom Limited Wireline modem, communication system and method of setting-up such
JP4754268B2 (en) * 2004-05-27 2011-08-24 パナソニック株式会社 COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD
JP4697773B2 (en) * 2004-12-24 2011-06-08 パナソニック株式会社 Multi-carrier communication apparatus and multi-carrier communication method
JP4697774B2 (en) * 2004-12-28 2011-06-08 パナソニック株式会社 Signal level adjusting device, communication device, and signal level adjusting method
JP2006203481A (en) * 2005-01-20 2006-08-03 Tokyo Electric Power Co Inc:The Power line communication system

Also Published As

Publication number Publication date
JP2008235993A (en) 2008-10-02

Similar Documents

Publication Publication Date Title
JP4143416B2 (en) Automatic gain control system for multi-user digital OFDM transmission system on electrical network
JP4824246B2 (en) Dynamic bias for RF power amplifiers
JP5393857B2 (en) Communication apparatus and communication method
JP5453427B2 (en) Shared time and frequency automatic gain control for wireless communication
JP6918991B2 (en) Startup signal management
US8498408B2 (en) Crosstalk estimation and power setting based on interpolation in a multi-channel communication system
US20030039317A1 (en) Method and apparatus for constructing a sub-carrier map
JP2004529577A5 (en)
JP4462216B2 (en) Power line communication device, power line communication network system, and power line communication method
US9100101B2 (en) Power line communication device and power control method thereof
EP2104297B1 (en) Transmission apparatus and transmission method
JP4778463B2 (en) Modem equipment
JP4708432B2 (en) Power line carrier communication modem
JP2002374190A (en) Device and system for electric power line communication
JP4835392B2 (en) Power line communication apparatus and power line communication network system
US8855701B2 (en) Dynamic transmission power control method
JP2006186733A (en) Communication apparatus and communication method
JP2007259176A (en) Power line communication apparatus, power line communication network system, and power line communication method
JP4543817B2 (en) Power line carrier communication equipment
JP5320026B2 (en) Transmitting apparatus and signal transmitting method
JP2001186072A (en) Wireless repeater
JP2003264485A (en) Power-line carrier communication equipment, and power line communication system
JP4905463B2 (en) Transmission power control method in communication system using multicarrier and radio communication apparatus using the same
JP2003249910A (en) Signal receiving method, communication method and communication equipment
US9197289B2 (en) Dynamic transmit power control method and power line communication system

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090218

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20101130

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101227

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110125

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110309

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110607

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110701

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140708

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees