JPH0398541U - - Google Patents
Info
- Publication number
- JPH0398541U JPH0398541U JP819790U JP819790U JPH0398541U JP H0398541 U JPH0398541 U JP H0398541U JP 819790 U JP819790 U JP 819790U JP 819790 U JP819790 U JP 819790U JP H0398541 U JPH0398541 U JP H0398541U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- telephone line
- correlation coefficient
- distance telephone
- long
- 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.)
- Pending
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
第１図はこの考案の一実施例による長距離電話
回線システムに関するブロツク図、第２図はこの
考案の他の実施例を示す長距離電話回線システム
に関するブロツク図、第３図は従来の長距離電話
回線システムに関するブロツク図である。
図において、１……電話機、２……ハイブリツ
ドコイル、３……相互相関係数ピーク値検出回路
、４……しきい値、５……比較回路、６……スイ
ツチ、７……差回路、８……擬似エコー発生回路
、９……送話側伝送線路、１０……受話側伝送線
路、１１……送話側信号レベル検出回路、１２…
…受話側信号レベル検出回路。なお、図中、同一
符号は同一、又は相当部分を示す。
Fig. 1 is a block diagram of a long distance telephone line system according to one embodiment of this invention, Fig. 2 is a block diagram of a long distance telephone line system showing another embodiment of this invention, and Fig. 3 is a block diagram of a conventional long distance telephone line system. 1 is a block diagram regarding a telephone line system. In the figure, 1...Telephone, 2...Hybrid coil, 3...Cross correlation coefficient peak value detection circuit, 4...Threshold value, 5...Comparison circuit, 6...Switch, 7...Difference circuit, 8...Pseudo echo generation circuit, 9...Transmission line on the sending side, 10...Transmission line on the receiving side, 11...Signal level detection circuit on the sending side, 12...
...Receiver side signal level detection circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
回線システムにおいて、エコーを除去するための
擬似エコー発生回路と受話側信号と送話側信号と
の相互相関係数を算出する回路と、上記回路より
算出された相互相関係数とあらかじめ設定された
閾（しきい）値を比較する回路と、その比較結果
に基づき制御するスイツチを備えたことを特徴と
する長距離電話回線システム。 In long-distance telephone line systems using satellite communications and submarine cables, there is a pseudo-echo generation circuit to remove echoes, a circuit that calculates the cross-correlation coefficient between the receiving side signal and the sending side signal, and calculation from the above circuit. What is claimed is: 1. A long-distance telephone line system comprising: a circuit that compares the calculated cross-correlation coefficient with a preset threshold; and a switch that performs control based on the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP819790U JPH0398541U (en) | 1990-01-30 | 1990-01-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP819790U JPH0398541U (en) | 1990-01-30 | 1990-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0398541U true JPH0398541U (en) | 1991-10-14 |
Family
ID=31511831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP819790U Pending JPH0398541U (en) | 1990-01-30 | 1990-01-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0398541U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006087628A (en) * | 2004-09-22 | 2006-04-06 | Adjuvant Cosme Japan:Kk | Iontophoresis and treatment with far infrared rays for active ingredients into hair |
-
1990
- 1990-01-30 JP JP819790U patent/JPH0398541U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006087628A (en) * | 2004-09-22 | 2006-04-06 | Adjuvant Cosme Japan:Kk | Iontophoresis and treatment with far infrared rays for active ingredients into hair |
| JP4530211B2 (en) * | 2004-09-22 | 2010-08-25 | 株式会社アジュバンコスメジャパン | Iontophoresis and treatment with far infrared rays for active ingredients into hair |
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