JPH0786958A - Automatic encoding rule switching system - Google Patents

Automatic encoding rule switching system

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Publication number
JPH0786958A
JPH0786958A JP24975993A JP24975993A JPH0786958A JP H0786958 A JPH0786958 A JP H0786958A JP 24975993 A JP24975993 A JP 24975993A JP 24975993 A JP24975993 A JP 24975993A JP H0786958 A JPH0786958 A JP H0786958A
Authority
JP
Japan
Prior art keywords
signal
law
exchange
coding
rule
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.)
Granted
Application number
JP24975993A
Other languages
Japanese (ja)
Other versions
JP2546517B2 (en
Inventor
Motohiro Nagai
基浩 永井
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP5249759A priority Critical patent/JP2546517B2/en
Publication of JPH0786958A publication Critical patent/JPH0786958A/en
Application granted granted Critical
Publication of JP2546517B2 publication Critical patent/JP2546517B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Telephonic Communication Services (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

PURPOSE:To omit the human labor of a setting operation and to prevent the erroneous operation by successively transmitting the test signals of different encoding rules, deciding a signal to be returned from an opposite side exchange corresponding to this transmission and automatically setting the correspondent encoding rule. CONSTITUTION:At the time of communication, first of all, transmission parts 12 and 13 successively transmit mu-rule and A-rule test tones respectively for X seconds and corresponding to this transmission, the signal returned from the opposite side exchange is received by a test tone reception comparison part 16. Based on this opposite side encoding rule, the comparison part 16 sets transmitted and received data selector parts 11 and 17 corresponding to the opposite side encoding rule according to the received signal from which echo is removed. Therefore, mu/A and A/mu conversion parts 14 and 15 can perform communication with the exchange of the mu-rule through paths 20A and 20B and with the opposite side exchange of the mu-rule or A-rule through an echo erase part 18 and a transmission line. Thus, the encoding rule is automatically set, the labor of the setting operation can be saved, and the erroneous operation can be prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、信号の符号化法則が異
なる各国のディジタル交換機を接続する場合に符号化法
則を切り替え設定する符号化法則自動切替方式に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coding rule automatic switching system for switching and setting the coding rules when connecting digital exchanges of different countries having different signal coding rules.

【０００２】[0002]

【従来の技術】従来、ディジタル交換機で扱われる音声
信号は、アナログ信号をディジタル化して圧縮・伸長を
行うものとなっており、音声信号を圧縮・伸長する場
合、μ−ｌａｗ（以下、μ−則）及びＡ−ｌａｗ（以
下、Ａ−則）の各符号化法則に基づいて行われる。そし
てこれらの符号化法則のうち、μ−則は日本及びアメリ
カ合衆国等の交換機で採用され、またＡ−則はヨーロッ
パ各国の交換機で採用されている。このような状況下に
おいて、例えば日本側の交換機とヨーロッパ側の交換機
とを接続する場合は、それぞれ符号化法則が異なるた
め、運用者または保守者が手動で符号化法則を適宜設定
するようにしている。2. Description of the Related Art Conventionally, a voice signal handled by a digital exchange has been designed so that an analog signal is digitized and compressed / decompressed. When compressing / decompressing a voice signal, a μ-law (hereinafter, μ- Law) and A-law (hereinafter, A-law). Among these coding laws, the μ-law is adopted in exchanges in Japan and the United States, and the A-law is adopted in exchanges in European countries. Under such circumstances, for example, when connecting a Japanese exchange and a European exchange, the encoding law is different, so the operator or maintenance person should manually set the encoding law as appropriate. There is.

【０００３】[0003]

【発明が解決しようとする課題】従来のディジタル交換
機では、外国交換機との伝送路を接続した場合、符号化
法則の異なる音声信号を的確に変換して交換機へ伝達で
きるように、伝送路上に配設されたエコーキャンセラ装
置毎に符号化法則を手動で選択設定しており、また交換
機間に伝送路を増減設する場合も同様であり、設定操作
が煩わしいという問題があった。また、設定時に人為的
なミスにより誤設定が生じるという問題もあった。In a conventional digital exchange, when a transmission line with a foreign exchange is connected, it is arranged on the transmission line so that voice signals having different coding rules can be accurately converted and transmitted to the exchange. The coding law is manually selected and set for each installed echo canceller device, and the same is true when the number of transmission lines is increased or decreased between exchanges, and there is a problem that the setting operation is troublesome. There is also a problem that an erroneous setting occurs due to a human error at the time of setting.

【０００４】したがって本発明は、それぞれ符号化法則
の異なる各国のディジタル交換機を接続する場合に符号
化法則を自動的に切り替え設定し、誤設定を無くすこと
を目的とする。Therefore, an object of the present invention is to automatically set the coding law when connecting digital exchanges of different countries, each of which has a different coding law, to eliminate erroneous setting.

【０００５】[0005]

【課題を解決するための手段】このような課題を解決す
るために、本発明は、伝送路を伝送される信号を第１の
符号化法則に基づいて変換する第１の交換機及び第２の
符号化法則に基づいて変換する第２の交換機を上記伝送
路を介して接続すると共に、接続された相手交換機に適
合する符号化法則を伝送路上に配設され信号の伝送に基
づくエコー信号を除去するエコーキャンセラ装置に対し
て設定し、第１及び第２の交換機間で通信を行うシステ
ムにおいて、上記通信の開始に先立ち第１及び第２の符
号化法則を有する第１及び第２のテスト信号を予め所定
時間づつ相手交換機側へ送信するテスト信号送信手段
と、各テスト信号の送信に対し相手交換機側から返送さ
れる信号を受信する信号受信手段と、この信号受信手段
により受信された信号が第１及び第２の符号化法則を有
する信号であるか否かを判定する信号判定手段と、信号
判定手段の判定出力に応じ符号化法則を設定する符号化
法則設定手段とを上記エコーキャンセラ装置に設けたも
のである。In order to solve such a problem, the present invention provides a first exchange and a second exchange which convert a signal transmitted through a transmission line based on a first coding law. A second exchange that performs conversion based on the coding law is connected through the transmission line, and a coding law that is compatible with the connected counterpart exchange is arranged on the transmission line and an echo signal based on signal transmission is removed. In the system for setting the echo canceller device to perform communication between the first and second exchanges, the first and second test signals having the first and second coding rules prior to the start of the communication. To the partner exchange side for a predetermined time in advance, a signal receiving means for receiving a signal returned from the partner exchange side for each test signal transmission, and a signal received by this signal receiving means. The echo canceller includes signal determining means for determining whether or not the signal has the first and second encoding laws, and encoding law setting means for setting the encoding law according to the determination output of the signal determining means. It is provided in the device.

【０００６】[0006]

【作用】通信の開始に先立ち相手交換機側へμ−則及び
Ａ−則を示す第１及び第２の符号化法則を有する各テス
ト信号を所定時間づつ送信し、各テスト信号の送信に対
し相手交換機側から返送される信号を判定して、この判
定出力に応じた符号化法則をエコーキャンセラ装置に自
動設定する。この結果、符号化法則の設定操作の煩わし
さが解消され、かつ人為ミスによる誤設定を無くすこと
が可能になる。Before the start of communication, each test signal having the first and second coding rules indicating the μ-law and the A-law is transmitted to the other exchange side for a predetermined time, and the other party responds to the transmission of each test signal. The signal returned from the exchange side is judged, and the coding rule corresponding to the judgment output is automatically set in the echo canceller device. As a result, it is possible to eliminate the troublesome operation of setting the coding law and eliminate erroneous setting due to human error.

【０００７】[0007]

【実施例】以下本発明について図面を参照して説明す
る。図１は、本発明に係る符号化法則自動切替方式を適
用したシステムの一実施例を示すブロック図である。同
図において、１は音声等の信号を符号化する場合の符号
化法則としてＡ−則が適用される外国側交換機、２は符
号化法則としてμ−則が適用される外国側交換機、３は
符号化法則として同様にμ−則が適用される国内側交換
機である。また、４1 ，４2 は伝送路、５1 〜５4 は音
声信号等の通信時に発生するエコー信号をキャンセルす
るエコーキャンセラ装置（以下、ＥＣ）である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a system to which an automatic coding law switching method according to the present invention is applied. In the figure, 1 is a foreign exchange to which A-law is applied as a coding law when encoding a signal such as voice, 2 is a foreign exchange to which a μ-law is applied as a coding law, and 3 is It is a domestic exchange to which the μ-law is similarly applied as an encoding law. Further, 41 and 42 are transmission lines, and 51 to 54 are echo canceller devices (hereinafter, EC) for canceling echo signals generated during communication such as voice signals.

【０００８】ここで、上記各交換機はいずれもディジタ
ル交換機であり、国内側交換機３と外国側交換機１とが
通信を行う場合は、国内側交換機３で符号化されたμ−
則の信号をＥＣ５1 によりＡ−則の信号に変換して外国
側交換機１へ送信する一方、外国側交換機１からのＡ−
則の信号はＥＣ５1 によりμ−則の信号に変換され国内
側交換機３へ送られる。なお、国内側交換機３が外国側
交換機２と通信を行う場合は、同一の符号化法則で符号
化されるため、上述した変換は行われない。Here, each of the above-mentioned exchanges is a digital exchange, and when the domestic exchange 3 and the foreign exchange 1 communicate with each other, the μ-coded by the domestic exchange 3 is used.
The law signal is converted to the A-law signal by EC51 and transmitted to the foreign exchange 1, while the foreign exchange 1 sends A-
The law signal is converted into a μ-law signal by EC51 and sent to the domestic exchange 3. When the domestic exchange 3 communicates with the foreign exchange 2, the above-mentioned conversion is not performed, because the exchanges are encoded by the same encoding rule.

【０００９】このように国内側交換機３の伝送路に配設
されるＥＣ５1 ，ＥＣ５2 は、国内側交換機１が外国側
交換機１，２と接続される場合、それぞれの交換機の符
号化法則に応じた信号の変換を行うものである。このよ
うな信号変換を各ＥＣ５1 ，ＥＣ５2 に行わせる場合、
従来は、各々が接続される外国交換機の符号化法則に適
合するように各ＥＣ５1 ，ＥＣ５2 において符号化法則
を手動切り替えしている。これに対し本発明では、通信
に先立ち、まずμ−則及びＡ−則の各テストトーンを所
定時間づつ送信し、この間に相手交換機側からの信号を
受信してこれらがμ−則及びＡ−則の何れかに合致する
かを判断し、この判断に応じた符号化法則に切り替える
ように各ＥＣ５1 ，ＥＣ５2 により自動的に制御する。As described above, the EC 51 and EC 52 arranged on the transmission line of the domestic exchange 3 correspond to the coding rules of the respective exchanges when the domestic exchange 1 is connected to the foreign exchanges 1 and 2. It is for converting signals. When each EC51 and EC52 is made to perform such signal conversion,
Conventionally, the coding law is manually switched in each of EC51 and EC52 so as to conform to the coding law of the foreign exchange to which they are connected. On the other hand, in the present invention, prior to the communication, first, each test tone of the μ-law and the A-law is transmitted for a predetermined time, and during this period, a signal from the partner exchange side is received and these are transmitted. It is determined which one of the rules is met, and the EC51 and EC52 are automatically controlled to switch to the coding law according to this judgment.

【００１０】次に図２は、国内側交換機３の伝送路に配
設されるＥＣ５1 及びＥＣ５2 のブロック図である。即
ち各ＥＣ５1 及びＥＣ５2 は同一構成となっており、何
れも送信データセレクタ部（以下、ＳＥＬ）１１、μ−
則テストトーン送信部１２、Ａ−則テストトーン送信部
１３、μ−則の信号をＡ−則の信号に変換するμ／Ａ変
換部１４、Ａ−則の信号をμ−則の信号に変換するＡ／
μ変換部１５、テストトーン受信比較部１６、受信デー
タセレクタ部（以下、ＳＥＬ）１７、及びエコー信号を
キャンセルするエコー消去部１８から構成されている。Next, FIG. 2 is a block diagram of EC51 and EC52 arranged on the transmission line of the domestic exchange 3. That is, each EC 51 and EC 52 have the same configuration, and both of them are the transmission data selector (SEL) 11, μ-
Law test tone transmission unit 12, A-law test tone transmission unit 13, μ / A conversion unit 14 that converts a μ-law signal into an A-law signal, and A-law signal is converted into a μ-law signal A /
The μ conversion unit 15, the test tone reception comparison unit 16, the reception data selector unit (hereinafter, SEL) 17, and the echo cancellation unit 18 that cancels the echo signal are included.

【００１１】例えば上記ＥＣ５1 では、国内側交換機３
から相手交換機である外国側交換機１，２に対し通信を
行う場合、まずテストトーン受信比較部１６からの出力
によりＳＥＬ１１を制御しμ−則テストトーン送信部１
２からのμ−則テストトーン信号を伝送路４1 へ所定時
間出力させる。そして、この間に、送信したμ−則テス
トトーン信号に対しＥＣ５3 によるエコー除去の信号及
び上記テストトーンの混合信号がテストトーン受信比較
部１６で受信される。この場合は、上記ＥＣ５3 ではＡ
−則に基づいてエコー除去が行われるためμ−則の信号
としては受信できず、したがってテストトーン受信比較
部１６は、この場合ＳＥＬ１１を制御してＡ−則テスト
トーン送信部１３からのＡ−則テストトーン信号を伝送
路４1 へ所定時間出力させる。For example, in the above EC51, the domestic exchange 3
When performing communication with the foreign exchanges 1 and 2 which are the other exchanges, first, the SEL 11 is controlled by the output from the test tone reception / comparison unit 16 to control the μ-law test tone transmission unit 1.
The μ-law test tone signal from 2 is output to the transmission line 41 for a predetermined time. Then, during this period, a signal for echo removal by EC53 and a mixed signal of the test tones are received by the test tone reception / comparison unit 16 with respect to the transmitted μ-law test tone signal. In this case, A in EC53 above
Since the echo is removed based on the rule, the signal cannot be received as a μ-law signal. Therefore, the test tone reception / comparison unit 16 controls the SEL 11 in this case, and the A-law from the test tone transmitting unit 13 The normal test tone signal is output to the transmission line 41 for a predetermined time.

【００１２】そしてこの間に、テストトーン受信比較部
１６は相手交換機側からＡ−則の信号を受信する。この
場合、ＥＣ５3 では上記と同様にＡ−則に基づいてエコ
ー除去が行われるため、テストトーン受信比較部１６で
はＡ−則の信号を受信でき、したがって相手交換機はＡ
−則の符号化法則を有する外国側交換機１であるとし
て、ＳＥＬ１１，１７を制御し、伝送路４1 とエコー消
去部１８とを、図２に示すパス２０Ａ，２０Ｂを介して
接続する。この結果、μ−則の国内側交換機３とＡ−則
の外国側交換機１とは、μ／Ａ変換部１４及びＡ／μ変
換部１５を介して接続されることになる。したがって、
国内側交換機３から出力されるμ−則の信号はμ／Ａ変
換部１４によりＡ−則の信号として外国側交換機１へ送
信されると共に、外国側交換機１から送信されるＡ−則
の信号はＡ／μ変換部１５によりμ−則の信号に変換さ
れ国内側交換機３で受信される。During this time, the test tone reception / comparison unit 16 receives the A-law signal from the partner exchange side. In this case, since the EC5 3 performs the echo removal based on the A-law in the same manner as described above, the test tone reception / comparison unit 16 can receive the signal of the A-law, and therefore the other exchange can use the A-law.
Assuming that it is the foreign exchange 1 having the coding rule of the rule, the SELs 11 and 17 are controlled and the transmission line 41 and the echo canceller 18 are connected via the paths 20A and 20B shown in FIG. As a result, the μ-law domestic exchange 3 and the A-law foreign exchange 1 are connected via the μ / A converter 14 and the A / μ converter 15. Therefore,
The μ-law signal output from the domestic exchange 3 is transmitted to the foreign exchange 1 by the μ / A converter 14 as an A-law signal, and also the A-law signal transmitted from the foreign exchange 1. Is converted into a μ-law signal by the A / μ converter 15 and received by the domestic exchange 3.

【００１３】なお、μ−則のテストトーン信号を送信し
た場合、これが例えばμ−則に基づいてエコー除去を行
うＥＣ５4 に伝達されれば、テストトーン受信比較部１
６においてはμ−則の信号を受信でき、したがって相手
交換機はμ−則の符号化法則を有する外国側交換機２で
ある判定する。そしてこの場合は、ＳＥＬ１１，１７を
制御し、伝送路４1 とエコー消去部１８とを、図２に示
すパス１９Ａ，１９Ｂを介して接続する。この結果、国
内側交換機３から出力されるμ−則の信号は変換されず
にそのまま外国側交換機２へ送信されると共に、外国側
交換機２から送信されるμ−則の信号はそのまま国内側
交換機３で受信される。When a μ-law test tone signal is transmitted, if the μ-law test tone signal is transmitted to the EC 54 that performs echo removal based on the μ-law, the test tone reception / comparison unit 1
In 6, it is possible to receive the μ-law signal, and therefore it is determined that the partner exchange is the foreign exchange 2 having the μ-law encoding law. In this case, the SELs 11 and 17 are controlled to connect the transmission line 41 and the echo canceller 18 via the paths 19A and 19B shown in FIG. As a result, the μ-law signal output from the domestic exchange 3 is directly transmitted to the foreign exchange 2 without being converted, and the μ-law signal transmitted from the foreign exchange 2 is directly transmitted to the domestic exchange. Received at 3.

【００１４】次に図３は、上述した符号化法則の切り替
えを行うＥＣ５1 の動作を具体的に示すフローチャート
である。即ち、国内側交換機３が外国側交換機と接続さ
れて通信を開始する前に、まずテストトーン受信比較部
１６は内部に記憶された切替完了フラグのオンを図３
（ａ）のステップＳＴ１で判断する。この切替完了フラ
グは、このＥＣ５1 において既に符号化法則の切り替え
が完了しているか否かを示すものである。そして、符号
化法則の切り替えが完了しておらずステップＳＴ１の判
定が「Ｎ」となる場合は、ステップＳＴ２でＳＥＬ１を
制御してμ−則テストトーン送信部１２からμ−則のテ
ストトーン信号を相手交換機側へＸ秒間送信させる。Next, FIG. 3 is a flow chart specifically showing the operation of the EC 51 for switching the above-mentioned coding law. That is, before the domestic exchange 3 is connected to the foreign exchange to start communication, the test tone reception / comparison unit 16 first turns on the switching completion flag stored therein.
The determination is made in step ST1 of (a). The switching completion flag indicates whether or not the switching of the coding rule has already been completed in this EC51. Then, when the switching of the coding law is not completed and the determination in step ST1 is “N”, SEL1 is controlled in step ST2 to control the μ-law test tone signal from the μ-law test tone transmitting unit 12. Is transmitted to the partner exchange side for X seconds.

【００１５】このＸ秒間の間、テストトーン受信比較部
１６では相手交換機側のＥＣ５3 またはＥＣ５4 による
上記μ−則テストトーンに対するエコー除去を示す信号
とμ−則テストトーンとの混合信号を受信することにな
るが、この場合テストトーン受信比較部１６ではまず図
３（ｂ）のステップＳＴ１１において切替完了フラグの
オンを判断のうえ、これが「Ｎ」であればステップＳＴ
１２へ移行し、受信した信号がμ−則の許容範囲内にあ
るか否かを判定するテストトーン受信比較を行う。そし
て相手交換機側の例えばＥＣ５4 に対しμ−則テストト
ーンを送信し、この結果受信信号がμ−則の許容範囲内
にあれば、ステップＳＴ１３でスルールート選択、つま
り図２において伝送路４1 とエコー消去部１８とをパス
１９Ａ，１９Ｂを介して接続する。そして、ステップＳ
Ｔ１４で切替完了フラグをオンとする。During this X seconds, the test tone reception / comparison section 16 must receive a mixed signal of a signal indicating echo cancellation for the above-mentioned μ-law test tone by the EC 5 3 or EC 54 on the partner exchange side and a μ-law test tone. In this case, the test tone reception / comparison unit 16 first determines in step ST11 of FIG. 3 (b) that the switching completion flag is ON, and if it is "N", then step ST11.
12, the test tone reception comparison is performed to determine whether the received signal is within the allowable range of the μ-law. Then, a μ-law test tone is transmitted to, for example, EC54 on the other exchange side, and if the received signal is within the allowable range of the μ-law as a result, the through route is selected in step ST13, that is, the transmission line 41 and echo in FIG. The erasing unit 18 is connected via the paths 19A and 19B. And step S
At T14, the switching completion flag is turned on.

【００１６】この結果、図３（ａ）のステップＳＴ１及
びＳＴ３ではともに「Ｙ」となるため、通信が開始され
ステップＳＴ５で国内側交換機３から外国側交換機（こ
の場合は外国側交換機２）へデータ送信が行われる。ま
た図３（ｂ）のステップＳＴ１５の判定が「Ｙ」となる
ため、ステップＳＴ１９において、外国側交換機２から
のデータが国内側交換機３で受信される。As a result, since both of the steps ST1 and ST3 of FIG. 3 (a) become "Y", the communication is started and the domestic exchange 3 switches to the foreign exchange (the foreign exchange 2 in this case) in step ST5. Data is transmitted. Since the determination in step ST15 of FIG. 3 (b) is "Y", the data from the foreign exchange 2 is received by the domestic exchange 3 in step ST19.

【００１７】一方、相手交換機側の例えばＥＣ５3 に対
しμ−則テストトーンを送信し、この結果テストトーン
受信比較部１６において受信信号がμ−則許容範囲外と
判定され、図３（ｂ）のステップＳＴ１２で「Ｎ」とな
る場合は、テストトーン受信比較部１６は、図３（ａ）
のステップＳＴ３で切替完了フラグのオフを確認のう
え、ステップＳＴ４でＳＥＬ１を制御してＡ−則テスト
トーン送信部１３からＡ−則のテストトーン信号を相手
交換機側へＸ秒間送信させる。そしてその後、切替完了
フラグがオンとなればステップＳＴ５へ移行し、上述し
たデータ送信が行われる。On the other hand, the μ-law test tone is transmitted to, for example, EC53 on the other exchange side, and as a result, the received signal is judged to be out of the μ-law allowable range by the test tone reception / comparison unit 16, and as shown in FIG. When the result is “N” in step ST12, the test tone reception / comparison unit 16 is shown in FIG.
After confirming that the switching completion flag is off in step ST3, the SEL1 is controlled in step ST4 to cause the A-law test tone transmitting unit 13 to transmit the A-law test tone signal to the partner exchange side for X seconds. After that, if the switching completion flag is turned on, the process proceeds to step ST5 and the above-mentioned data transmission is performed.

【００１８】上記Ａ−則テストトーン送信部１３からの
Ａ−則テストトーン信号の送信に対し、テストトーン受
信比較部１６は、図３（ｂ）のステップＳＴ１５で切替
完了フラグのオフを確認のうえ、上記Ｘ秒間の間、相手
交換機側から送信される上述のエコー除去を示す信号と
Ａ−則テストトーン信号との混合信号を受信する。続い
てステップＳＴ１６では、相手交換機側からの受信信号
がＡ−則の許容範囲内にあるか否かを判定するテストト
ーン受信比較を行う。そして相手交換機側の例えばＥＣ
５3 に対しＡ−則テストトーンを送信し、この結果受信
信号がＡ−則の許容範囲内にあれば、ステップＳＴ１７
で「Ａ→μ変換ルート選択」、つまり図２において伝送
路４1 とエコー消去部１８とをパス２０Ａ，２０Ｂを介
して接続する。続いて、図３（ｂ）のステップＳＴ１８
で切替完了フラグをオンとする。In response to the transmission of the A-law test tone signal from the A-law test tone transmitting section 13, the test tone reception comparing section 16 confirms that the switching completion flag is off in step ST15 of FIG. 3B. In addition, during the X seconds, the mixed signal of the signal indicating the above-mentioned echo cancellation and the A-law test tone signal transmitted from the partner exchange side is received. Subsequently, in step ST16, a test tone reception comparison is performed to determine whether the received signal from the partner exchange side is within the allowable range of the A-law. And, for example, EC on the partner exchange side
If the received signal is within the allowable range of the A-law as a result of transmission of the A-law test tone to 53, step ST17.
Then, “A → μ conversion route selection”, that is, the transmission line 41 and the echo canceller 18 in FIG. 2 are connected via paths 20A and 20B. Then, step ST18 of FIG.3 (b)
Turns on the switching completion flag.

【００１９】この切替完了フラグのオンにより外国側交
換機（この場合は外国側交換機１）と通信が開始され、
かつステップＳＴ１５の判定が「Ｙ」となるためステッ
プＳＴ１９へ移行し、この結果ステップＳＴ１９で外国
側交換機１からのデータが国内側交換機３により受信さ
れる。なお、外国側交換機に接続される各ＥＣ５3 ，５
4 に対し各テストトーンを送信し、各ＥＣ５3 ，５4 か
らの信号がμ−則及びＡ−則の何れでも無い場合は、ス
テップＳＴ２０において例えば国内側交換機３に対し障
害報告を行う。When the switching completion flag is turned on, communication with the foreign exchange (the foreign exchange 1 in this case) is started,
Since the determination in step ST15 is "Y", the process proceeds to step ST19, and as a result, the data from the foreign exchange 1 is received by the domestic exchange 3 in step ST19. In addition, each EC53,5 connected to the foreign exchange
When each test tone is transmitted to 4 and the signals from each EC 53 and 54 are neither μ-law nor A-law, a fault report is made to the domestic exchange 3, for example, in step ST20.

【００２０】[0020]

【発明の効果】以上説明したように本発明によれば、そ
れぞれ符号化法則の異なる各国のディジタル交換機を接
続して通信を行う場合、通信の開始に先立ち相手交換機
側へμ−則及びＡ−則を示す第１及び第２の符号化法則
を有する各テスト信号を所定時間づつ送信すると共に、
各テスト信号の送信に対して相手交換機側から返送され
る信号を判定し、この判定出力に応じた符号化法則を自
動的にエコーキャンセラ装置に設定するようにしたの
で、符号化法則の設定操作の煩わしさが解消されると共
に、人為ミスによる誤設定を防止することが可能にな
る。As described above, according to the present invention, when digital exchanges of different countries having different encoding rules are connected for communication, the μ-law and the A-rule are sent to the other exchange side prior to the start of communication. Each test signal having the first and second coding rules indicating a rule is transmitted for a predetermined time, and
The signal returned from the partner exchange side for each test signal transmission is judged, and the coding law according to this judgment output is automatically set in the echo canceller device. It is possible to eliminate the troublesomeness and prevent erroneous settings due to human error.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係る符号化法則自動切替方式を適用し
たシステムの一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a system to which an encoding rule automatic switching system according to the present invention is applied.

【図２】上記システムを構成するエコーキャンセラ装置
のブロック図である。FIG. 2 is a block diagram of an echo canceller device that constitutes the system.

【図３】上記エコーキャンセラ装置の動作を示すフロー
チャートである。FIG. 3 is a flowchart showing the operation of the echo canceller device.

【符号の説明】[Explanation of symbols]

１，２ 外国側交換機 ３ 国内側交換機 ４1 ，４2 伝送路 ５1 〜５4 エコーキャンセラ装置（ＥＣ） １１ 送信データセレクタ部（ＳＥＬ） １２ μ−則テストトーン送信部 １３ Ａ−則テストトーン送信部 １４ μ／Ａ変換部 １５ Ａ／μ変換部 １６ テストトーン受信比較部 １７ 受信データセレクタ部（ＳＥＬ） １８ エコー消去部 1, 2 Foreign exchanges 3 Domestic exchanges 41, 42 Transmission lines 51-54 Echo canceller equipment (EC) 11 Transmission data selector (SEL) 12 μ-law test tone transmitter 13 A-law test tone transmitter 14 μ / A conversion unit 15 A / μ conversion unit 16 Test tone reception comparison unit 17 Received data selector unit (SEL) 18 Echo cancellation unit

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成６年６月２２日[Submission date] June 22, 1994

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【特許請求の範囲】[Claims]

【手続補正２】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】０００５[Name of item to be corrected] 0005

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【０００５】[0005]

【課題を解決するための手段】このような課題を解決す
るために、本発明は、伝送路を伝送される信号を第１の
符号化法則に基づいて変換する第１の交換機及び第２の
符号化法則に基づいて変換する第２の交換機を上記伝送
路を介して接続すると共に、接続された相手交換機に適
合する符号化法則を伝送路上に配設され信号の伝送に基
づくエコー信号を除去するエコーキャンセラ装置に対し
て設定し、第１及び第２の交換機間で通信を行うシステ
ムにおいて、上記通信の開始に先立ち第１及び第２の符
号化法則を有する第１及び第２のテスト信号を予め所定
時間づつ相手交換機側へ送信するテスト信号送信手段
と、各テスト信号の送信に対し相手交換機側から返送さ
れる信号を受信する信号受信手段と、この信号受信手段
により受信された信号が第１及び第２の符号化法則を有
する信号であるか否かを判定する信号判定手段と、信号
判定手段の判定出力に応じ符号化法則を設定する符号化
法則設定手段とを上記エコーキャンセラ装置に設けたも
のである。また、エコーキャンセラ装置（５１）は、第
１の符号化法則のテストトーンを送出する第１の符号化
法則テストトーン送信部（１２）と、第２の符号化法則
のテストトーンを送出する第２の符号化法則テストトー
ン送信部（１３）と、第１の交換機（３）から伝送路
（４１）への、また伝送路から第１の交換機へのエコー
信号をキャンセルするエコー消去部（１８）と、第１の
交換機から伝送路へ送出される信号を第１の符号化法則
から第２の符号化法則へ変換する第１／第２変換部（１
４）と、制御信号によって、第１の符号化法則テストト
ーン送信部、第２の符号化法則テストトーン送信部、エ
コー消去部および第１／第２変換部からの信号のいずれ
かを選択して伝送路へ送出する送信データセレクタ部
（１１）と、伝送路から第１の交換機へ伝送されてきた
信号を第２の符号化法則から第１の符号化法則へ変換す
る第２／第１変換部（１５）と、制御信号によって、第
２／第１の変換部からの信号および伝送路から直接入力
される信号のいずれかを選択してエコー消去部を介して
第１の交換機へ送出する受信データセレクタ部（１７）
と、伝送路から受信された受信信号に応じて送信データ
セレクタ部または受信データセレクタ部へ制御信号を出
力するテストトーン受信比較部（１６）とを備えたもの
である。また、テストトーン受信比較部は、送信データ
セレクタ部を制御して第１の符号化法則のテストトーン
を選択して所定時間だけ伝送路に出力させ、伝送路から
第１の符号化法則のテストトーンが受信できない場合
は、送信データセレクタ部を制御して第２の符号化法則
のテストトーを選択して所定時間だけ伝送路に出力さ
せ、伝送路から第２の符号化法則のテストトーンが受信
できた場合は、送信データセレクタ部を制御して第１／
第２変換部からの信号を選択して出力させるとともに、
受信データセレクタ部を制御して第２／第１変換部から
の信号を選択して出力させるものである。また、第１の
符号化法則をμ−則にし、第２の符号化法則をＡ−則に
したものである。 In order to solve such a problem, the present invention provides a first exchange and a second exchange which convert a signal transmitted through a transmission line based on a first coding law. A second exchange that performs conversion based on the coding law is connected through the transmission line, and a coding law that is compatible with the connected counterpart exchange is arranged on the transmission line and an echo signal based on signal transmission is removed. In the system for setting the echo canceller device to perform communication between the first and second exchanges, the first and second test signals having the first and second coding rules prior to the start of the communication. To the partner exchange side for a predetermined time in advance, a signal receiving means for receiving a signal returned from the partner exchange side for each test signal transmission, and a signal received by this signal receiving means. The echo canceller includes signal determining means for determining whether or not the signal has the first and second encoding laws, and encoding law setting means for setting the encoding law according to the determination output of the signal determining means. It is provided in the device. Also, the echo canceller device (5 1 ) sends a first coding law test tone transmitting section (12) which sends a test tone of the first coding law, and a test tone of the second coding law. A second coding law test tone transmitting section (13) and an echo canceling section for canceling an echo signal from the first exchange (3) to the transmission line (4 1 ) and from the transmission line to the first exchange. (18) and a first / second conversion unit (1) for converting the signal sent from the first exchange to the transmission line from the first coding law to the second coding law.
4) and the control signal to select one of the signals from the first coding law test tone transmitting section, the second coding law test tone transmitting section, the echo canceling section and the first / second conversion section. And a transmission data selector section (11) for transmitting to a transmission path by a second / first conversion method for converting a signal transmitted from the transmission path to the first exchange from the second coding law to the first coding law. The converter (15) and the control signal select either the signal from the second / first converter or the signal directly input from the transmission path and send it to the first exchange through the echo canceller. Received data selector section (17)
When, that example Bei the test tone reception comparing section for outputting a control signal to the transmission data selector or the received data selector unit in response to the reception signal received from the transmission path (16)
Is. In addition, the test tone reception comparison unit
Test tone of the first coding law by controlling the selector unit
Select and output for a predetermined time to the transmission line,
When the test tone of the first coding law cannot be received
Controls the transmission data selector unit to control the second coding law.
Select the test toe and output it to the transmission line for a predetermined time.
The test tone of the second coding law is received from the transmission line.
If it is possible, the transmission data selector unit is controlled to
While selecting and outputting the signal from the second converter,
From the second / first conversion unit by controlling the reception data selector unit
Is selected and output. Also the first
The coding law is μ-law, and the second coding law is A-law.
It was done.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 伝送路を伝送される信号を第１の符号化
法則に基づいて変換する第１の交換機及び第２の符号化
法則に基づいて変換する第２の交換機を前記伝送路を介
して接続すると共に、接続された相手交換機に適合する
符号化法則を前記伝送路上に配設され前記信号の伝送に
基づくエコー信号を除去するエコーキャンセラ装置に対
して設定し、前記第１及び第２の交換機間で通信を行う
システムにおいて、 前記通信の開始に先立ち第１及び第２の符号化法則を有
する第１及び第２のテスト信号を予め所定時間づつ相手
交換機側へ送信するテスト信号送信手段と、前記各テス
ト信号の送信に対し相手交換機側から返送される信号を
受信する信号受信手段と、この信号受信手段により受信
された信号が第１及び第２の符号化法則を有する信号で
あるか否かを判定する信号判定手段と、信号判定手段の
判定出力に応じ符号化法則を設定する符号化法則設定手
段とを前記エコーキャンセラ装置に備え、符号化法則を
自動的に切り替え設定することを特徴とする符号化法則
自動切替方式。1. A first exchange for converting a signal transmitted through a transmission line based on a first coding law and a second exchange for converting a signal based on a second coding law via the transmission line. And an encoding law adapted to the connected counterpart exchange is set for the echo canceller device arranged on the transmission path for removing the echo signal based on the transmission of the signal, and the first and second In the system for performing communication between the exchanges, the test signal transmitting means for transmitting first and second test signals having the first and second coding rules to the partner exchange side in advance every predetermined time before the communication is started. A signal receiving means for receiving a signal returned from the other exchange side in response to the transmission of each of the test signals, and a signal received by the signal receiving means having the first and second encoding rules. The echo canceller device is provided with a signal determining means for determining whether or not there is a signal, and a coding law setting means for setting a coding law according to the determination output of the signal determining means, and the coding law is automatically switched and set. Automatic switching method of coding law, which is characterized.
JP5249759A 1993-09-13 1993-09-13 Automatic coding law switching method Expired - Lifetime JP2546517B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5249759A JP2546517B2 (en) 1993-09-13 1993-09-13 Automatic coding law switching method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5249759A JP2546517B2 (en) 1993-09-13 1993-09-13 Automatic coding law switching method

Publications (2)

Publication Number Publication Date
JPH0786958A true JPH0786958A (en) 1995-03-31
JP2546517B2 JP2546517B2 (en) 1996-10-23

Family

ID=17197812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5249759A Expired - Lifetime JP2546517B2 (en) 1993-09-13 1993-09-13 Automatic coding law switching method

Country Status (1)

Country Link
JP (1) JP2546517B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365725A (en) * 2000-03-16 2002-02-20 Agere Syst Guardian Corp Method of determining whether A-law or mu-law encoding is applied

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365725A (en) * 2000-03-16 2002-02-20 Agere Syst Guardian Corp Method of determining whether A-law or mu-law encoding is applied
GB2365725B (en) * 2000-03-16 2002-12-11 Agere Syst Guardian Corp Detecting encoding and encoding conversion for modem connections
US6693967B1 (en) 2000-03-16 2004-02-17 Agere Systems Inc. Detecting encoding and encoding conversion for modem connections

Also Published As

Publication number Publication date
JP2546517B2 (en) 1996-10-23

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