JP2775846B2 - Time division multiplexer - Google Patents

Time division multiplexer

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Publication number
JP2775846B2
JP2775846B2 JP1118333A JP11833389A JP2775846B2 JP 2775846 B2 JP2775846 B2 JP 2775846B2 JP 1118333 A JP1118333 A JP 1118333A JP 11833389 A JP11833389 A JP 11833389A JP 2775846 B2 JP2775846 B2 JP 2775846B2
Authority
JP
Japan
Prior art keywords
signal
exchange
speed
conversion unit
line
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
JP1118333A
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Japanese (ja)
Other versions
JPH02298132A (en
Inventor
滋 青山
秀昭 山中
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
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Priority to JP1118333A priority Critical patent/JP2775846B2/en
Publication of JPH02298132A publication Critical patent/JPH02298132A/en
Application granted granted Critical
Publication of JP2775846B2 publication Critical patent/JP2775846B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Time-Division Multiplex Systems (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はデータや音声を時分割多重伝送する装置に
関し、特に交換機の出線信号により速度変換部または符
号変換部を選択し多重を行う時分割多重化装置に関する
ものである。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for time-division multiplex transmission of data and voice, and more particularly to a method for selecting a speed conversion unit or a code conversion unit based on an outgoing signal of an exchange and performing multiplexing. The present invention relates to a division multiplexing device.

〔従来の技術〕[Conventional technology]

第2図は,時分割多重伝送の概念を示す図であり,図
において,(1)は時分割多重化装置,(2)はデイジ
タル交換機,(5)および(15)はデイジタル交換機
(2)に収容される端末,(14)は通信伝送路,(18)
は加入者線である。第3図は時分割多重化装置(1)と
デイジタル交換機(2)との接続を示す図で,(3)は
インタフエース部,(4)は可聴信号源,(6)はイン
タフエース部(3)からデイジタル交換機(2)への出
線,(7)はデイジタル交換機(2)からインタフエー
ス部(3)への入線,(8)は伝送路(入線),(9)
は伝送路(出線),(10A)は伝送路内符号化方式によ
る符号信号を交換機内符号化方式による符号信号に変換
する符号変換部,(10B)は交換機内符号化方式による
符号信号を伝送路内符号化方式による符号信号に変換す
る符号変換部である。通信伝送路(14)上の信号は効率
を上げるため,各チヤネルの信号を帯域圧縮し,時分割
多重化装置(1)で多重化する。通信伝送路(14)内で
使われる符号方式には,前信号からの予測値と実際の信
号との誤差信号を符号化する32kbps適応差分PCM(以下A
DPCMという)や16kbps Sub Band Coding(以下SBCとい
う)などがある。一方,デイジタル交換機(2)では,
自局の収容端末(5)に加入者線(18)を接続する必要
または輻輳などの各種情報を伝送するために可聴信号源
(4)に加入者線(18)を接続する必要があり,交換機
(2)の内部では64kbpsのPCM符号化信号が使われ,伝
送路内符号化方式と交換機内符号化方式は異なつてい
る。このために時分割多重化装置(1)のチヤネルに対
応したインタフエース部(3)にはデイジタル交換機
(2)内部の64Kbps PCM符号化信号と伝送路内の符号
化信号との変換を行う符号変換部(10A),(10B)が設
けられている。
FIG. 2 is a diagram showing the concept of time division multiplex transmission, in which (1) is a time division multiplexing device, (2) is a digital exchange, (5) and (15) are digital exchanges (2). Terminals accommodated in the network, (14) is a communication transmission line, (18)
Is a subscriber line. FIG. 3 is a diagram showing the connection between the time division multiplexer (1) and the digital exchange (2), (3) is an interface unit, (4) is an audible signal source, and (6) is an interface unit ( Outgoing line from 3) to the digital exchange (2), (7) incoming line from the digital exchange (2) to the interface unit (3), (8) transmission line (ingoing line), (9)
Is a transmission line (outgoing line), (10A) is a code conversion unit that converts a code signal by the intra-transmission line coding method into a code signal by the intra-switch coding method, and (10B) is a code conversion unit that converts the code signal by the intra-switch coding method. This is a code conversion unit that converts the signal into a code signal based on the intra-channel coding method. In order to increase the efficiency of the signal on the communication transmission line (14), the signal of each channel is band-compressed and multiplexed by the time division multiplexer (1). The coding method used in the communication transmission line (14) includes a 32 kbps adaptive difference PCM (hereinafter referred to as A) for coding an error signal between a predicted value from a previous signal and an actual signal.
DPCM) and 16kbps Sub Band Coding (SBC). On the other hand, in the digital exchange (2),
It is necessary to connect the subscriber line (18) to the accommodation terminal (5) of the own station, or to connect the subscriber line (18) to the audible signal source (4) in order to transmit various information such as congestion. A 64 kbps PCM coded signal is used inside the exchange (2), and the intra-transmission path encoding method and the intra-exchange encoding method are different. For this purpose, the interface section (3) corresponding to the channel of the time division multiplexer (1) has a code for converting between a 64 Kbps PCM coded signal in the digital exchange (2) and a coded signal in the transmission path. Conversion units (10A) and (10B) are provided.

また,呼に設定するための信号(オフフツク信号,ダ
イヤル信号,オンフツク信号など)やサービス情報(課
金情報など)のシグナリングはアウトバンド方式で行わ
れるのが一般的である。
Signals for setting up a call (off-hook signal, dial signal, on-hook signal, etc.) and service information (billing information, etc.) are generally performed in an out-band manner.

つぎに,図にもとづいて動作を説明する。説明を容易
にするために,伝送路内符号化信号を32Kbps ADPCM,交
換機内符号化信号を64Kbps PCMとし,端末(5)を電話
機として,発信局と着信局の間に中継局が一つ介在する
中継伝送について説明する。
Next, the operation will be described with reference to the drawings. For ease of explanation, the intra-channel coded signal is 32Kbps ADPCM, the intra-switch coded signal is 64Kbps PCM, terminal (5) is a telephone, and one relay station is interposed between the calling station and the receiving station. Will be described.

まず,空チヤネルに対して,発信局,中継局および着
信局の交換機(2)は64Kbps PCMに符号化された無通
話状態を示す信号(以下無通話パターンという)を,時
分割多重化装置(1)の交換機(2)から入線(7)に
送出している。この無通話パターンはインタフエース部
(3)の符号変換部(10B)で伝送路内の符号化信号で
ある32Kbps ADPCMに変換されて伝送路(出線)(9)
へ送出される。通信伝送路(14)から送られてくる無通
話ターンは時分割多重化装置(1)のインタフエース部
(3)の伝送路(入線)(8)に入力され,符号変換部
(10A)で,交換機内符号化信号である64Kbps PCMに変
換される。
First, with respect to the empty channel, the exchange (2) of the originating station, the relay station, and the terminating station transmits a signal indicating a no-communication state encoded to 64 Kbps PCM (hereinafter referred to as a non-communication pattern) to a time-division multiplexing device ( It is sent from the exchange (2) of 1) to the incoming line (7). This non-communication pattern is converted into a 32 Kbps ADPCM, which is a coded signal in the transmission path, by a code conversion section (10B) of the interface section (3), and the transmission path (outgoing line) (9)
Sent to The non-communication turn sent from the communication transmission line (14) is input to the transmission line (input line) (8) of the interface unit (3) of the time-division multiplexing device (1) and is converted by the code conversion unit (10A). , Is converted to 64Kbps PCM which is an intra-switch coded signal.

つぎに,発信局の交換機(2)に収容される電話機
(5)がフツクオフしダイヤル番号を送出すると,これ
らの信号はアウトバンドで処理されて,中継局と着信局
の交換機(2)へ送られる。各局の交換機(2)は,上
記の無通話パターンより空チヤネルを探し発信局−中継
局−着信局の通話ルートを設定する。発信局の交換機
(2)に収容される電話機(5)からの音声信号は交換
機(2)内のコーデツク(図示していない)により,64K
bpsのPCMに符号化され,時分割多重化装置(1)の交換
機からの入線(7)に送られる。符号変換部(10B)は
この64Kbps PCMの信号を伝送路内の符号化信号である3
2Kbps ADPCMに変換して伝送路(出線)(9)に送り出
す。着信局の電話機(5)からの音声信号も同じように
伝送路(出線)(9)に送出される。通信伝送路(14)
を伝わつて中継局の時分割多重化装置(1)の伝送路
(入線)(8)に到達した32Kbps ADPCM信号は符号変
換部(10A)で交換機内符号信号である64Kbps PCM信号
に符号変換され、交換機(2)の通話ルートを通り再び
時分割多重化装置(1)のインタフエース部(3)の入
線(7)に入り,符号変換部(10B)で伝送路内符号信
号である32Kbps ADPCM信号に符号変換されて,伝送路
(14)を経由し着信局または発信局に到達する。
Next, when the telephone (5) accommodated in the exchange (2) of the calling station hooks off and sends out the dial number, these signals are processed out-of-band and sent to the exchange (2) of the relay station and the receiving station. Can be The exchange (2) of each station searches for an empty channel based on the above-mentioned non-communication pattern and sets a communication route of a calling station, a relay station, and a receiving station. The voice signal from the telephone (5) accommodated in the exchange (2) of the originating station is converted to 64K by a codec (not shown) in the exchange (2).
It is encoded into bps PCM and sent to the incoming line (7) from the exchange of the time division multiplexer (1). The code conversion unit (10B) converts the 64 Kbps PCM signal into a coded signal in the transmission path.
Convert to 2Kbps ADPCM and send to transmission line (outgoing line) (9). Similarly, the voice signal from the telephone (5) of the receiving station is transmitted to the transmission line (outgoing line) (9). Communication transmission line (14)
The 32Kbps ADPCM signal that reaches the transmission line (incoming line) (8) of the time division multiplexer (1) of the relay station through the transmission is transcoded by the transcoder (10A) into a 64Kbps PCM signal which is a code signal in the exchange. Then, the signal passes through the communication route of the exchange (2), enters the input line (7) of the interface unit (3) of the time division multiplexer (1) again, and is converted by the code conversion unit (10B) into a 32 Kbps ADPCM which is a code signal in the transmission path. The signal is converted into a signal and reaches the receiving station or the transmitting station via the transmission path (14).

着信局または発信局へ伝送された32Kbps ADPCMの信
号は,時分割多重化装置(1)のインタフエース部
(3)に入り,符号変換部(10A)で交換機内符号信号
である64Kbps PCM信号に変換され,コーデツク(図示
していない)で音声信号に戻されて加入者線(18)を通
じて電話機(5)に送られる。
The 32 Kbps ADPCM signal transmitted to the receiving station or the calling station enters the interface section (3) of the time division multiplexing device (1), and is converted to a 64 Kbps PCM signal which is a code signal in the exchange by the code conversion section (10A). It is converted, converted back to a voice signal by a codec (not shown), and sent to the telephone (5) through the subscriber line (18).

このように,一つの信号が中継接続されると必ず一回
の符号化・復号化が行われるので,多段中継されるとそ
の中継段数と同じ回数の符号化・復号化が中継局の時分
割多重化装置(1)で繰り返されることになる。
As described above, since one encoding / decoding operation is always performed when one signal is relay-connected, if the relaying is performed in multiple stages, the same number of encoding / decoding operations as the number of relay stages are performed by the time division of the relay station. It will be repeated in the multiplexing device (1).

この符号化・復号化は音声品質の劣下の原因および帯
域圧縮の制限になつている。
The encoding / decoding causes a deterioration in voice quality and limits band compression.

多段中継伝送による符号化・復号化の繰り返しを低減
するために,例えば,沖電気研究開発第135号Vol54,No.
3(昭和62年7月)に示されている方法がある。これを
第4図と第5図に示す。図において,(11A),(11B)
は伝送路内符号化信号と交換機内符号化信号の信号速度
を変換する速度変換部,(16)はPBX,(17)は符号変換
部(10A)(10B)と速度変換部(11A),(11B)の切替
えを指示する制御線である。
To reduce repetition of encoding / decoding by multi-stage relay transmission, see, for example, Oki Electric R & D No. 135, Vol.
3 (July 1987). This is shown in FIGS. 4 and 5. In the figure, (11A), (11B)
Is a rate converter that converts the signal rates of the coded signal in the transmission path and the coded signal in the exchange, (16) is a PBX, (17) is a code converter (10A) (10B) and a rate converter (11A), This is a control line for instructing the switching of (11B).

この例では,伝送路内の符号化方式として,32Kbps AD
PCMより更に高能率である16Kbps SBC方式を用いてい
る。
In this example, a 32 Kbps AD
The 16Kbps SBC method, which is even more efficient than PCM, is used.

デイジタル交換機(2)はアウトバンドで送られてく
る情報により呼ごとに接続パターンに対応させて速度変
換部(11A),(11B)と符号変換部(10A),(10B)の
切替えを制御線(17)を介して指示する。すなわち,中
継局であれば速度変換部を選択する指示を,発信局また
は着信局であれば,符号変換部を選択する指示を時分割
多重化装置(1)に送る。
The digital exchange (2) controls the switching between the rate converters (11A) and (11B) and the code converters (10A) and (10B) in accordance with the connection pattern for each call based on information sent out-of-band. Direct through (17). That is, an instruction to select a speed conversion unit is sent to the time division multiplexing device (1) if it is a relay station, and an instruction to select a code conversion unit is sent to a time division multiplexing device (1) if it is a calling or receiving station.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

従来の時分割多重化装置は以上のように構成されてい
るので、デイジタル交換機からのPCM信号を伝送路内の
符号信号に変換し,また伝送路からの伝送路内符号化信
号を交換機内のPCM符号信号に変換しなければならず中
継段数が多くなると符号信号の変換も多くなるため音声
品質を低下させる原因となり,また帯域圧縮の制限にも
なるという問題点があつた。
The conventional time-division multiplexing device is configured as described above, so that the PCM signal from the digital exchange is converted into a coded signal in the transmission line, and the coded signal in the transmission line from the transmission line is converted in the exchange. If the number of relay stages must be converted to a PCM code signal, the conversion of the code signal also increases, which causes a reduction in voice quality, and also limits the band compression.

また,これに対し,時分割多重化装置に符号変換部と
速度変換部を設け,デイジタル交換機からの指示により
これらを切替える方式もあるが,デイジタル交換機との
制御信号のインタフエースが必要となり,使用に際して
はこのインタフエースをもつ交換機に限られるという問
題点があつた。
On the other hand, there is a method in which a code conversion unit and a speed conversion unit are provided in the time division multiplexing device and these are switched according to an instruction from the digital exchange. However, the interface of the control signal with the digital exchange is necessary, At the time, there was a problem that the exchange was limited to the exchange having this interface.

この発明は上記のような問題点を解消するためになさ
れたもので,中継伝送による音声品質の低下を防止でき
るとともに,符号変換部/速度変換部の切替制御インタ
フエースを持たない交換機にも接続できる時分割多重化
装置を得ることを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can prevent a decrease in voice quality due to relay transmission, and can also be connected to an exchange having no switching control interface between a code conversion unit and a speed conversion unit. It is an object of the present invention to obtain a time-division multiplexing device that can be used.

〔課題を解決するための手段〕[Means for solving the problem]

この発明に係る時分割多重化装置は、多重・分離部と
インタフェース部とからなり、上記インタフェース部
は、自局交換機からの入線側と自局交換機への出線側に
設けられて入力された信号の信号速度を伝送路信号速度
または交換機内信号速度のいずれか一方から他方に変換
する速度変換部と、自局交換機からの入線側と自局交換
機への出線側に設けられて入力された信号の符号を伝送
路内符号化方式による符号化信号または交換機内符号化
方式による符号化信号に変換する符号変換部と、自局交
換機からの入線の信号から無通話状態を示す信号又は速
度変換された伝送路内信号を検出すると前記速度変換部
を選択する第1の選択信号を発し、それ以外は前記符号
変換部を選択する第2の選択信号を発する監視部と、該
監視部からの第1の選択信号または第2の選択信号に基
づいて前記速度変換部または前記符号変換部を選択して
その選択した変換部の出力を交換機と伝送路へ供給する
選択手段とを備えたものであるのである。
A time-division multiplexing device according to the present invention comprises a multiplexing / demultiplexing unit and an interface unit, and the interface unit is provided on an incoming line from a local exchange and an outgoing line to a local exchange and input. A speed converter for converting the signal speed of the signal from one of the transmission line signal speed and the signal speed in the exchange to the other, and provided on the incoming line side from the local exchange and the outgoing line side to the local exchange to be input. A code conversion unit for converting the code of the received signal into a coded signal by an intra-line coding system or a coded signal by an intra-switch coding system, and a signal or speed indicating a no-communication state from an incoming line signal from the local exchange. Upon detecting the converted signal in the transmission path, the monitoring section issues a first selection signal for selecting the speed conversion section, and otherwise issues a second selection signal for selecting the code conversion section. First choice Signal or than is obtained by a selection means for supplying an output of the selected transform unit to the exchange to the transmission line by selecting the speed conversion section or the code conversion unit based on the second selection signal.

〔作用〕[Action]

監視部から自局交換機からの入線上の信号から無通話
状態を示す信号または交換機内の信号速度に速度変換さ
れた伝送路内符号化方式による符号信号のどちらか一方
を検出すると,入線側と出線側に対応して設けられた速
度変換部と符号変換部の速度変換部を選択手段により選
択し,上記信号以外の時は符号変換部を選択する。
When the monitoring unit detects either a signal indicating a no-communication state from a signal on the incoming line from the local exchange or a code signal by an intra-transmission line encoding method converted to a signal speed in the exchange, the monitoring unit detects the signal on the incoming line. The speed conversion unit provided for the outgoing line side and the speed conversion unit of the code conversion unit are selected by the selection means, and when the signal is other than the above signal, the code conversion unit is selected.

〔発明の実施例〕(Example of the invention)

以下,この発明の一実施例を図について説明する。第
1図において,(10A)は伝送路内符号化信号を交換機
内符号化信号に変換する符号変換部,(10B)は交換機
内符号化信号を伝送路内符号化信号に変換する符号変換
部,(11A)は伝送路内符号化信号の信号速度を交換機
内の信号速度に変換する速度変換部,(11B)は交換機
内信号速度を伝送路内信号速度に変換する速度変換部,
(12)は自局交換機からの入線上の信号を監視する監視
部,(13)は監視部(12)の検出出力により符号変換部
(10A),(10B)と速度変換部(11A),(11B)のどち
らかを選択する選択手段である切替スイツチである。ま
た第2図〜第5図と同一部分または相当部分は同一符号
を付して説明を省略する。
An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (10A) is a code conversion unit for converting an intra-transmission-line coded signal into an intra-switch coded signal, and (10B) is a code conversion unit for converting an intra-exchange coded signal into a transmission-line coded signal. , (11A) is a speed converter for converting the signal speed of the coded signal in the transmission line into the signal speed in the exchange, (11B) is a speed converter for converting the signal speed in the exchange to the signal speed in the transmission line,
(12) is a monitoring unit that monitors the signal on the incoming line from the local exchange, (13) is a code conversion unit (10A), (10B) and a speed conversion unit (11A) based on the detection output of the monitoring unit (12). This is a switching switch which is a selection means for selecting either of (11B). 2 to FIG. 5 are denoted by the same reference numerals, and description thereof is omitted.

つぎに,動作を図にもとづいて説明する。 Next, the operation will be described with reference to the drawings.

まずはじめに,呼が発生していない状態では,交換機
(2)は無通話パターンを送出するので,インターフエ
ース部(3)の監視部(12)は交換機からの入線(7)
に現われるこの無通話パターンを検出すると切替スイツ
チ(13)を動作させ速度変換部(11A),(11B)を選択
する。速度変換部(11B)で無通話パターンはその信号
速度について,伝送路内の信号速度である32Kbpsに変換
されて伝送路(出線)(9)に出力される。この信号は
通信伝送路(14)を介して隣り合う交換局の多重化装置
(1)へ伝送される。この信号はインタフエース部
(3)の伝送路(入線(8)に入る。前述したように各
交換機は速度変換部(11A),(11B)を選択しているの
で、伝送路(入線)(8)の信号は速度変換部(11A)
で速度変換され64Kbps PCM信号となり交換機(2)内
へ送られる。
First, in the state where no call is generated, the exchange (2) sends out a no-communication pattern, so that the monitoring unit (12) of the interface unit (3) transmits the incoming line (7) from the exchange.
When the non-communication pattern appearing in (1) is detected, the switching switch (13) is operated to select the speed converters (11A) and (11B). The speed conversion unit (11B) converts the non-communication pattern into a signal speed of 32 Kbps, which is a signal speed in the transmission line, and outputs it to the transmission line (outgoing line) (9). This signal is transmitted to the multiplexing device (1) of the adjacent exchange via the communication transmission line (14). This signal enters the transmission line (input line (8) of the interface unit (3). As described above, since each exchange selects the speed conversion units (11A) and (11B), the transmission line (input line) ( The signal of 8) is the speed converter (11A)
The speed is converted to a 64 Kbps PCM signal and sent to the exchange (2).

ここで,中継の段数を従来技術の説明の場合と同じと
してすなわち発信局−中継局−着信局の1段として,呼
が発生し中継する場合を説明する。
Here, a case in which a call is generated and relayed, assuming that the number of relay stages is the same as in the description of the related art, that is, as one stage of a source station-relay station-destination station, will be described.

発信局の交換機(2)に収容される電話機(5)が呼
を発生すると,通話ルート設定まではアウトバンドで処
理される。通話路が設定されると,電話機(5)からの
音声信号は交換機(2)内で64Kbps PCM信号に符号化
されて時分割多重化装置(1)のインタフエース部
(3)の入線(7)に送られる。監視部(12)はこの64
Kbps PCM信号が無通話パターンまたは速度変換された
伝送路内符号化信号以外であることを検出し,切替スイ
ツチ(13)を速度変換部(11A),(11B)から符号変換
部(10A),(10B)に切替える。したがつて,この64Kb
ps PCM信号は符号変換部(10B)で伝送路内符号化信号
である32Kbps ADPCM信号に符号変換される。変換され
た32Kbps ADPCM信号は伝送路(14)を介して中継局の
時分割多重化装置(1)の伝送路(入線)(8)に到達
するが,中継局の時分割多重化装置(1)では,速度変
換膨(11A),(11B)が選択されたままであるので,32K
bps ADPCM信号は交換機(2)内の信号速度である64Kb
psに速度変換されて交換機(2)を中継し時分割多重化
装置(1)のインタフエース部(3)の入線(7)に入
る。入線(7)上の信号を監視している監視部(12)は
交換機内の信号速度である64Kbpsに速度変換された伝送
路内符号化信号であることを検出し、更に速度変換部
(11A),(11B)を選択し続ける。インタフエース部
(3)の入線(7)上の64Kbpsに速度変換された信号は
速度変換部(11A)で再び伝送路内符号化信号に速度変
換されて着信局へ伝送される。着信局の時分割多重化装
置(1)では発信局と同様に符号変換部(10A),(10
B)が選択されているので,中継局からの信号は,符号
変換部(10A)(10B)が選択されているので,中継局か
らの信号は,符号変換部(10A)で交換機内符号化信号
である64Kbps PCM信号に符号変換され、交換機(2)
内で音声信号に戻されて,加入者線(18)を介して電話
機(5)に送られる。
When the telephone (5) accommodated in the exchange (2) of the originating station generates a call, the call is processed out-of-band until the call route is set. When the communication path is set, the voice signal from the telephone (5) is encoded into a 64 Kbps PCM signal in the exchange (2) and is input to the input line (7) of the interface (3) of the time division multiplexer (1). ). The monitoring unit (12)
Detects that the Kbps PCM signal is other than a no-communication pattern or a rate-converted intra-transmission-path coded signal, and switches the switching switch (13) from the rate converters (11A) and (11B) to the code converter (10A). Switch to (10B). Therefore, this 64Kb
The ps PCM signal is code-converted into a 32 Kbps ADPCM signal, which is an intra-transmission-path coded signal, by a code converter (10B). The converted 32 Kbps ADPCM signal reaches the transmission line (input line) (8) of the time division multiplexing device (1) of the relay station via the transmission line (14). In), since the speed conversion dilators (11A) and (11B) remain selected,
bps ADPCM signal is 64Kb which is the signal speed in the exchange (2)
The speed is converted to ps and the signal is relayed through the exchange (2) and enters the input line (7) of the interface section (3) of the time division multiplexer (1). The monitoring unit (12) that monitors the signal on the incoming line (7) detects that the signal is an intra-transmission-line coded signal that has been converted to a signal speed of 64 Kbps, which is a signal speed in the exchange. ) And (11B) continue to be selected. The signal whose speed has been converted to 64 Kbps on the input line (7) of the interface unit (3) is again converted to an intra-line coded signal by the speed conversion unit (11A) and transmitted to the receiving station. In the time division multiplexing device (1) of the receiving station, the code conversion units (10A) and (10
Since B) is selected, the signal from the relay station is selected by the code conversion unit (10A) (10B), so the signal from the relay station is encoded by the code conversion unit (10A) in the exchange. The signal is converted into a 64Kbps PCM signal, which is a signal.
The voice signal is returned to the telephone and sent to the telephone (5) via the subscriber line (18).

また,着信局の電話機(5)からの通話ルートについ
ても,前述した動作と同じ動作となる。発信局および着
信局の交換機(2)に接続される時分割多重化装置
(1)では,監視部(12)が呼の発生していない段階で
は無通話パターンを検出し速度変換部(11A),(11B)
を選択しており,通話路が設定された段階では音声信号
の64Kbps PCM信号を検出するので符号変換部(10A),
(10B)を選択する。
In addition, the same operation as the above-mentioned operation is performed for the call route from the telephone (5) of the receiving station. In the time-division multiplexing device (1) connected to the exchanges (2) of the calling station and the called station, the monitoring unit (12) detects a no-communication pattern when there is no call, and the speed conversion unit (11A) , (11B)
Is selected and the 64Kbps PCM signal of the audio signal is detected when the communication path is set, so the code conversion unit (10A)
Select (10B).

一方,中継局の交換機(2)に接続される時分割多重
化装置(1)では,監視部(12)が呼の発生していない
段階では無通話パターンを検出し,通話ルートが設定さ
れた段階では速度変換された伝送路内符号化信号を検出
するので両段階において速度変換部を選択する。
On the other hand, in the time-division multiplexing device (1) connected to the exchange (2) of the relay station, the monitoring unit (12) detects a no-communication pattern when no call is generated, and sets a communication route. In the stage, the speed-converted intra-channel coded signal is detected, so that the speed converter is selected in both stages.

なお、上記実施例では選択手段として切替スイツチ
(13)を出力側に設けたものを示したが、これに限定さ
れるものでなく,入力側であつてもよく,また変換部の
動作をオン・オフさせるなどであつてもよい。
In the above-described embodiment, the switching switch (13) is provided on the output side as the selection means. However, the present invention is not limited to this. The switching switch (13) may be provided on the input side.・ It may be turned off.

また,上記実施例では交換機内符号化方式が64Kbps
PCM,伝送路内符号化方式が32Kbps ADPCMの場合につい
て説明したが,この組合せに限らず他の符号化方式であ
つてもよく,上記実施例と同様の効果を奏する。
Also, in the above embodiment, the encoding method in the exchange is 64 Kbps.
Although the description has been given of the case where the PCM and the intra-channel encoding method are 32 Kbps ADPCM, the present invention is not limited to this combination, and other encoding methods may be used, and the same effects as in the above-described embodiment can be obtained.

〔効果〕〔effect〕

以上のように,この発明によれば交換機からの入線上
の信号を監視して無通話状態を示す信号または速度変換
された伝送路内符号化信号を検出した時には速度変換部
を選択するようにしたので,多段中継の符号化・復号化
による音声品質の劣下を防止でき,また接続する交換機
との間で切替指示を行う切替制御用のインタフエースが
不要となる。
As described above, according to the present invention, the signal on the incoming line from the exchange is monitored, and when a signal indicating a no-communication state or a speed-converted intra-transmission-line coded signal is detected, the speed converter is selected. As a result, deterioration of voice quality due to encoding / decoding of multistage relay can be prevented, and an interface for switching control for instructing switching with the exchange to be connected becomes unnecessary.

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

第1図はこの発明の一実施例による時分割多重化装置の
インタフエース部の構成を示す図,第2図は中継の概念
を示す図,第3図は従来の時分割多重化装置のインタフ
エース部を示す図であり,第4図,第5図は従来の時分
割多重化装置の一部改良例である。 (1)……時分割多重化装置,(2)……交換機,
(3)……インタフエース部,(6)……交換機への出
線,(7)……交換機からの入線,(8)……伝送路
(出線),(10A),(10B)……符号変換部,(11
A),(11B)……速度変換部,(12)……監視部,(1
3)……選択手段。 なお,図中,同一符号は同一,又は相当部分を示す。
FIG. 1 is a diagram showing a configuration of an interface unit of a time division multiplexer according to an embodiment of the present invention, FIG. 2 is a diagram showing a concept of relay, and FIG. 3 is an interface of a conventional time division multiplexer. FIG. 4 is a diagram showing an ace part, and FIGS. 4 and 5 show a partially improved example of a conventional time division multiplexer. (1) ... time division multiplexer, (2) ... exchange,
(3) Interface section, (6) Outgoing line to exchange, (7) ... Incoming line from exchange, (8) Transmission line (outgoing line), (10A), (10B) ... ... Code conversion unit, (11
A), (11B): Speed conversion unit, (12): Monitoring unit, (1
3) ... Selection means. In the drawings, the same reference numerals indicate the same or corresponding parts.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) H04J 3/00 - 3/26 H04L 5/22 - 5/26 H04Q 11/04──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H04J 3/00-3/26 H04L 5/22-5/26 H04Q 11/04

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】多重・分離部とインタフェース部とからな
り、中継伝送を行うディジタル交換機に接続される時分
割多重化装置において、上記インタフェース部は、 自局交換機からの入線側と自局交換機への出線側に設け
られて入力された信号の信号速度を伝送路内信号速度ま
たは交換機内信号速度のいずれか一方から他方に変換す
る速度変換部と、 自局交換機からの入線側と自局交換機への出線側に設け
られて入力された信号の符号を伝送路内符号化方式によ
る符号化信号または交換機内符号化方式による符号化信
号に変換する符号変換部と、 自局交換機からの入線の信号から無通話状態を示す信号
又は速度変換された伝送路内信号を検出すると前記速度
変換部を選択する第1の選択信号を発し、それ以外は前
記符号変換部を選択する第2の選択信号を発する監視部
と、 該監視部からの第1の選択信号または第2の選択信号に
基づいて前記速度変換部または前記符号変換部を選択し
てその選択した変換部の出力を交換機と伝送路へ供給す
る選択手段とを備えたことを特徴とする時分割多重化装
置。
1. A time division multiplexing device comprising a multiplexing / demultiplexing unit and an interface unit and connected to a digital exchange for relay transmission, wherein the interface unit is connected to an incoming line from a local exchange and to a local exchange. A speed converter for converting the signal speed of the input signal provided on the outgoing line from either the signal speed in the transmission path or the signal speed in the switch to the other, the incoming line from the local exchange, and the local station A code conversion unit provided on the outgoing line side to the exchange for converting the code of the input signal into an encoded signal according to an intra-transmission line encoding method or an encoded signal according to an intra-exchange encoding method; When a signal indicating a no-communication state or a speed-converted signal in the transmission path is detected from the incoming signal, a first selection signal for selecting the speed conversion unit is issued, and otherwise, a second selection signal for selecting the code conversion unit is issued. A monitoring unit for issuing a selection signal; and selecting the speed conversion unit or the code conversion unit based on the first selection signal or the second selection signal from the monitoring unit and switching the output of the selected conversion unit to an exchange. A time-division multiplexing device, comprising: selecting means for supplying to a transmission path.
JP1118333A 1989-05-11 1989-05-11 Time division multiplexer Expired - Fee Related JP2775846B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1118333A JP2775846B2 (en) 1989-05-11 1989-05-11 Time division multiplexer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1118333A JP2775846B2 (en) 1989-05-11 1989-05-11 Time division multiplexer

Publications (2)

Publication Number Publication Date
JPH02298132A JPH02298132A (en) 1990-12-10
JP2775846B2 true JP2775846B2 (en) 1998-07-16

Family

ID=14734068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1118333A Expired - Fee Related JP2775846B2 (en) 1989-05-11 1989-05-11 Time division multiplexer

Country Status (1)

Country Link
JP (1) JP2775846B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992003023A1 (en) * 1990-08-06 1992-02-20 Fujitsu Limited Communication equipment having repeat switching function
WO1995024802A1 (en) * 1994-03-09 1995-09-14 British Telecommunications Public Limited Company Bandwidth management in a switched telecommunications network
US5526350A (en) * 1994-03-09 1996-06-11 British Telecommunications Public Limited Company Communication network with bandwidth managers for allocating bandwidth to different types of traffic
CA2158298A1 (en) * 1994-09-22 1996-03-23 Haim Guata Digital speech communication system
GB9507058D0 (en) * 1995-04-05 1995-05-31 Newbridge Networks Corp Super tandem high capacity voice transmission system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924480A (en) * 1988-03-11 1990-05-08 American Telephone And Telegraph Company Codecs with suppression of multiple encoding/decodings across a connection

Also Published As

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JPH02298132A (en) 1990-12-10

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