JPS6384398A - Key telephone system - Google Patents
Key telephone systemInfo
- Publication number
- JPS6384398A JPS6384398A JP23055386A JP23055386A JPS6384398A JP S6384398 A JPS6384398 A JP S6384398A JP 23055386 A JP23055386 A JP 23055386A JP 23055386 A JP23055386 A JP 23055386A JP S6384398 A JPS6384398 A JP S6384398A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- signal
- information
- pseudo
- telephones
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 27
- 238000001228 spectrum Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 230000005855 radiation Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Landscapes
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はボタン電話装置に利用する。特に、主装置から
端末電話機へのディジタル情報の伝送に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a button telephone device. In particular, it relates to the transmission of digital information from a main device to a terminal telephone.
従来のボタン電話機として、主装置と複数の端末電話機
との間を上り方向と下り方向の二つの伝送線路で接続し
、この伝送路で制御信号および音声信号のディジタル伝
送を行う装置が知られている。このようなボタン電話装
置では、主装置から各端末電話機への情報を多重化し、
有効情報のない区間すなわち無効情報区間には、「０」
または「１」の一方が連続するディジタル信号を挿入し
て伝送していた。As a conventional button telephone, there is a known device in which a main unit and a plurality of terminal telephones are connected by two transmission lines, one in the up direction and the other in the down direction, and digital transmission of control signals and voice signals is carried out through these transmission lines. There is. In such a button telephone device, information from the main device to each terminal telephone is multiplexed,
"0" is set for an interval without valid information, that is, an invalid information interval.
Alternatively, one of the "1s" was transmitted by inserting a continuous digital signal.
しかし、例えば伝送信号としてマンチェスタ符号を用い
る場合に、無効情報区間をすべて「０」とすると、主伝
送周波数ｆ。の周波数成分が増加し、この周波数ｆ。で
周波数スペクトラムに太きなピークが生じる。このため
、放射雑音のスペクトラムも周波数ｆ。で大きなピーク
を生じ、周囲に対して大きな雑音を放射する欠点があっ
た。特に、周波数ｆ０が放送電波が利用する周波数に近
い場合には、ラジオまたはテレビに影響を与える問題が
あった。However, for example, when using Manchester code as a transmission signal, if all invalid information sections are set to "0", the main transmission frequency f. The frequency component of f increases, and this frequency f. A thick peak appears in the frequency spectrum. Therefore, the spectrum of radiation noise also has a frequency f. It has the disadvantage of producing large peaks and emitting large noise to the surrounding area. In particular, when the frequency f0 is close to the frequency used by broadcast waves, there is a problem that it affects radio or television.
本発明は、以上の問題点を解″決し、周波数スペクトラ
ムに大きなピークを生じることのないボタン電話装置を
提供することを目的とする。It is an object of the present invention to solve the above problems and provide a button telephone device that does not cause large peaks in the frequency spectrum.
本発明のボタン電話装置は、複数の端末電話機と、これ
らの端末電話機を収容する主装置とを備え、上記主装置
は、各端末電話機に対するディジタル情報を多重化して
上記複数の端末電話機に対して一定周期の同期にしたが
って送出する多重送信手段を含むボタン電話装置におい
て、」二記多重送信手鎧は、端末電話機に送出すべき有
効情報がない無効情報区間には上記一定周期に比較して
十分に長い周期の擬似ランダム信号を送出する手段を含
むことを特徴とする。The button telephone device of the present invention includes a plurality of terminal telephones and a main device accommodating these terminal telephones, and the main device multiplexes digital information for each terminal telephone and transmits it to the plurality of terminal telephones. In a button telephone device including a multiplex transmission means that transmits data according to the synchronization of a fixed period, the multiple transmission mechanism described in "2" is sufficient compared to the above fixed period for an invalid information section in which there is no valid information to be sent to the terminal telephone. It is characterized in that it includes means for transmitting a long-cycle pseudo-random signal.
本発明のボタン電話装置は、無効情報区間には擬似ラン
ダム信号を伝送する。これにより周波数スペクトラムの
ピークを低減させそのエネルギ分布を一様にし、周囲に
対する雑音を削減することができる。The button telephone device of the present invention transmits a pseudo-random signal during the invalid information section. This reduces the peak of the frequency spectrum, makes the energy distribution uniform, and reduces noise to the surroundings.
第１図は本発明実施例ボタン電話装置の主装置の要部ブ
ロック構成図を示し、第２図は本実施例装置の全体的な
ブロック構成図を示す。FIG. 1 shows a block diagram of the main part of the main unit of a button telephone device according to an embodiment of the present invention, and FIG. 2 shows an overall block diagram of the device according to the embodiment.
制御回路１は有効情報送出部２、擬似ランダム信号生成
部３および送出用レジスタ４に接続される。有効情報送
出部２および擬似ランダム信号生成部３は送出用レジス
タ４に接続される。送出用レジスタ４はドライバ回路５
を介して下り方向伝送線路６に接続される。The control circuit 1 is connected to a valid information sending section 2, a pseudorandom signal generating section 3, and a sending register 4. The valid information sending section 2 and the pseudorandom signal generating section 3 are connected to a sending register 4. Sending register 4 is driver circuit 5
It is connected to the downlink transmission line 6 via.
主装置１１は、下り方向伝送線路６および上り方向伝送
線路７を介して、端末電話機１２−１〜１２−ｎに接続
される。Main device 11 is connected to terminal telephones 12-1 to 12-n via downlink transmission line 6 and uplink transmission line 7.
主装置１１および端末電話機１２−１〜１２−ｎはそれ
ぞれコーデックを含み、ディジタル多重伝送方式により
相互に情報の送受信を行う。主装置から各端末電話機１
２−１〜１２−ｎへの電力供給は、下り方向伝送線路６
および上り方向伝送線路７に重畳してファンタムにより
行う。The main device 11 and the terminal telephones 12-1 to 12-n each include a codec, and mutually transmit and receive information using a digital multiplex transmission method. From the main device to each terminal telephone 1
Power is supplied to 2-1 to 12-n through the downstream transmission line 6.
The signal is superimposed on the upstream transmission line 7 using a phantom.
主装置１１から端末電話機１２−１〜１２−ｎに有効情
報を送出するときには、この有効情報を制御回路１から
有効情報送出部２に送出し、送出用レジスタ４に有効情
報を書込み、ドライバ回路５で符号化して下り方向伝送
線路６に送出する。When sending valid information from the main device 11 to the terminal telephones 12-1 to 12-n, this valid information is sent from the control circuit 1 to the valid information sending unit 2, the valid information is written in the sending register 4, and the driver circuit 5 and sent to the downlink transmission line 6.
有効情報がないときには、制御回路１は擬似ランダム信
号生成部３を動作させる。擬似ランダム信号生成部３は
、伝送フレームの周期に比べて十分に長い周期の擬似ラ
ンダム信号を送出用レジスタ４に送出し、ドライバ回路
５で符号化して下り方向伝送線路６に送出する。When there is no valid information, the control circuit 1 operates the pseudo-random signal generator 3. The pseudo-random signal generating section 3 sends out a pseudo-random signal with a period sufficiently longer than the period of the transmission frame to the sending register 4, encodes it in the driver circuit 5, and sends it out to the downlink transmission line 6.
各端末電話機１２−１〜１２−ｎからの情報の送出（上
り方向）については、伝送線路の長さの差から信号タイ
ミングにずれがあるため、無効情報区間に擬似ランダム
信号を挿入しなくても、外部に周期的な雑音を発生させ
るようなピークスペクトラムを生じることはない。した
がって、本発明は原則として下り方向伝送線路６につい
て実施すれば十分である。Regarding the transmission of information (in the upstream direction) from each terminal telephone 12-1 to 12-n, there is a difference in signal timing due to the difference in the length of the transmission line, so a pseudo-random signal must be inserted into the invalid information section. However, there is no peak spectrum that would cause external periodic noise. Therefore, in principle, it is sufficient to implement the present invention on the downlink transmission line 6.
ドライバ回路５での符号則として、どのような符号則を
用いても本発明を実施できるが、以下ではマンチェスタ
符号則を用いた例を説明する。Although the present invention can be implemented using any code rule as the code rule in the driver circuit 5, an example using the Manchester code rule will be described below.
第３図は擬似ランダム信号を用いない場合の信号波形を
示し、第４図は擬似ランダム信号を用いた場合の信号波
形を示す。FIG. 3 shows a signal waveform when a pseudo-random signal is not used, and FIG. 4 shows a signal waveform when a pseudo-random signal is used.
有効情報区間には、「０」と「１」とが混在する情報信
号を送出する。無効情報区間には、マンチェスタ符号則
による「０」の信号列の代わりに、「０」と「１」とが
混在しく平均的に分布する）擬像ランダム信号を送出す
る。In the valid information section, an information signal containing a mixture of "0" and "1" is transmitted. In the invalid information section, instead of the signal string of "0" according to the Manchester code rule, a pseudo-random signal (in which "0" and "1" are mixed and distributed evenly) is sent.
第５図は周波数スペクトラムを示す。横軸は周波数であ
り、縦軸は強度を示す。実線は擬似ランダム信号を用い
ない場合（従来例）のスペクトラムであり、破線は擬似
ランダム信号を用いた本発明実施例のスペクトラムを示
す。FIG. 5 shows the frequency spectrum. The horizontal axis represents frequency, and the vertical axis represents intensity. The solid line shows the spectrum when no pseudorandom signal is used (conventional example), and the broken line shows the spectrum of the embodiment of the present invention using a pseudorandom signal.
マンチェスタ符号を伝送符号として用いていた従来例装
置では、「０１符号が連続すると主伝送周波数ｒ０の繰
り返しとなるため、周波数ｆ。でピークスペクトラムが
生じ、「１」符号が連続した場合にも同様にピークスペ
クトラムムが生しる。In conventional devices that use Manchester codes as transmission codes, continuous 01 codes result in repetition of the main transmission frequency r0, so a peak spectrum occurs at frequency f, and the same occurs when continuous 1 codes occur. A peak spectrum is generated.
しかし、この部分を擬似ランダム信号とすることにより
、ピークスペクトラムを小さくすることができる。However, by making this part a pseudo-random signal, the peak spectrum can be made smaller.
以上説明したように、本発明のボタン電話装置は、デー
タ伝送時の無効情報区間に擬似ランダム信号を挿入する
ことにより、伝送波形のスペクトラムの最大値を減少さ
せ、放射雑音の最大レベルを低減させる効果がある。こ
れにより、周囲に配置される装置、特にラジオやテレビ
などへの雑音の混入が軽減される。As explained above, the button telephone device of the present invention reduces the maximum value of the spectrum of the transmitted waveform and reduces the maximum level of radiation noise by inserting a pseudo-random signal into the invalid information section during data transmission. effective. This reduces noise intrusion into surrounding devices, particularly radios, televisions, and the like.
第１図は本発明実施例ボタン電話装置の要部ブロック構
成図。
第２図は本実施例の全体を示すブロック構成図。
第３図は擬似ランダム信号を用いない場合の信号波形を
示す図。
第４図は擬似ランダム信号を用いた場合の信号波形を示
す図。
第５図は周波数スペクトラムを示す図。
〕・・・制ｔｉ１１回路、２・・・有効情報通山部、３
・・・擬似ラングＪ、信号生成部、４・・・送出用レジ
スタ、５・・・ドライバ回路、６・・・下り方向伝送線
路、７・・・上り方向伝送線路、１１・・・主装置、１
２１〜１２−ｎ・・・端末電話機。
・ 辰′FIG. 1 is a block diagram of main parts of a button telephone device according to an embodiment of the present invention. FIG. 2 is a block diagram showing the entire structure of this embodiment. FIG. 3 is a diagram showing a signal waveform when a pseudorandom signal is not used. FIG. 4 is a diagram showing a signal waveform when a pseudorandom signal is used. FIG. 5 is a diagram showing a frequency spectrum. ]...Control ti11 circuit, 2...Effective information communication section, 3
... Pseudo rung J, signal generation section, 4... Sending register, 5... Driver circuit, 6... Downward direction transmission line, 7... Upward direction transmission line, 11... Main device ,1
21 to 12-n...Terminal telephones.・Tatsu′
Claims (1)
多重化して上記複数の端末電話機に対して一定周期の同
期にしたがって送出する多重送信手段を含む ボタン電話装置において、 上記多重送信手段は、端末電話機に送出すべき有効情報
がない無効情報区間には上記一定周期に比較して十分に
長い周期の擬似ランダム信号を送出する手段を含む ことを特徴とするボタン電話装置。(1) Comprising a plurality of terminal telephones and a main device accommodating these terminal telephones, the main device multiplexes digital information for each terminal telephone and synchronizes the plurality of terminal telephones at a constant period. Therefore, in a button telephone device including a multiplex transmission means for transmitting, the multiplex transmission means transmits a pseudo-random signal with a cycle sufficiently long compared to the above-mentioned constant cycle in an invalid information section in which there is no valid information to be transmitted to the terminal telephone. A button telephone device characterized in that it includes means for transmitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61230553A JPH0815344B2 (en) | 1986-09-29 | 1986-09-29 | Button telephone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61230553A JPH0815344B2 (en) | 1986-09-29 | 1986-09-29 | Button telephone device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6384398A true JPS6384398A (en) | 1988-04-14 |
| JPH0815344B2 JPH0815344B2 (en) | 1996-02-14 |
Family
ID=16909563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61230553A Expired - Lifetime JPH0815344B2 (en) | 1986-09-29 | 1986-09-29 | Button telephone device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0815344B2 (en) |
-
1986
- 1986-09-29 JP JP61230553A patent/JPH0815344B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0815344B2 (en) | 1996-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |