JPS5997237A - Compander control system in maritime satellite communication system - Google Patents

Abstract

PURPOSE:To transmit data automatically between a coast earth station and an international exchange, by adding a disable tone detector of an echo suppressor to a compander. CONSTITUTION:Detectors 31 and 32 of an enable tone which enables an echo suppressor 21 of an international exchange 4 are provided in a coast earth station 3 and a ship station 2. When a calling subscriber of a land subscriber's terminal 5 dials the number of the ship station 2 to be called and makes conversation with a telephone set 11 to operate a disable tone generator 25, the echo suppressor 21 of the international exchange 4 is stopped. The disable tone passes the coast earth station 3 through a communication line and reaches the ship station 2 through a communication satellite 1, and therefore, detectors 31 and 32 are operated to enable companders 19 and 14, and preparation for data transmission is completed when the transmission of the enable tone is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a maritime satellite communication system, and particularly to a control method for a con gunda provided within this system.

A maritime satellite communication system usually consists of a shore earth station with a compander, a ship station with a compander and an incoming data terminal, an international switching center with an echo suppressor, and nine
It consists of an outgoing data terminal and a land-based subscriber terminal equipped with a generator for generating a disable tone to disable the echo suppressor during the transmission of data. In a conventional maritime satellite communication system having such a configuration, when setting a transmission path for a data call or the like, the following method is adopted to disable the functions of the two con-gundas. Namely.

Along with sending out the echo suppressor and sadisaple tone to stop the echo suppressor.

The land caller informs the international exchange that it is a data call.

The operator of the international switchboard transmits selected digits containing the identification of the data call included in the numbering plan to the shore earth station. The shore earth station would analyze the selected digits, determine that it was a data call, and disable the companders of its own station and the ship's station either directly or via the communications satellite. For this reason, it was necessary to newly incorporate the identification of the data call path into the numbering plan, and since it was semi-automatic, it lacked the convenience of handling.

Therefore, an object of the present invention is to add data call identification to the numbering plan between the coastal earth station and the international switching center when a caller at a land terminal sends data from a data terminal in a maritime satellite communication system as described above. The purpose of the present invention is to provide a compander control method that allows the sender to directly control the compander without the need for a compander.

In order to achieve the above object, the present invention provides that a disabling signal for the echo suppressors of two international exchanges is not only sent to the shore earth station, but is also transmitted to the ship station via one communication satellite, and also that the signal disables the echo suppressors of two international exchanges. Noting that it is rather preferable to enable the echo suppressors at approximately the same time, the present invention uses a signal to stop the echo suppressors to stop the compander [7].

According to the invention, a coast earth station equipped with a con gunda;
A ship station that is equipped with a compander and an incoming data terminal and communicates with the coast station via a communication satellite.

an international switching center connected to the coast earth station and equipped with an echo suppressor; a data terminal for one outgoing call accommodated in the international switching center via a communication line; A maritime satellite communication system comprising: a land-based subscriber terminal equipped with an oscillator that generates a Disney sound tone to deactivate an echo suppressor; The apparatus is characterized in that means is provided for detecting a disable tone when it appears and generates a tone detection signal, and each of the terminals is configured to stop its operation in response to the tone detection signal. A compander control method for a maritime satellite communication system is obtained.

Next, a detailed explanation will be given with reference to the drawings.

FIG. 1 is a diagram of a relay system in a conventional maritime satellite communication system. Let me give you a general explanation first.

A ship station 2 and a coast earth station 3, which use the satellite 1 as a medium,
and an international switching center 4 connected to the coast earth station 3.

It consists of land terminals 5 accommodated in this international exchange via a domestic communication network or an international communication network.

Next, each part will be explained.

The ship station 2 has a telephone 11 and a data terminal 12.

Controller 13 that controls them and Konnogunda 1
4, a wireless device 15, and an antenna 16. The coastal earth station 3 is comprised of an antenna 17, a radio device 18, a con gunda 19, and an access and control isoment 20 for controlling them. The international exchange 4 is composed of an echo suppressor 21 and an international exchange 22. The land subscriber terminal 5 is comprised of a telephone 23, a data terminal 24, and a disable tone generator 25.

The system having the above configuration operates as follows. In order to call the ship station 2, the caller at the land terminal 5 dials the number of the called ship station 2 in the same way as a normal international call. The dialed number is sent to the shore earth station 3 via the international exchange 4 through the existing line, and the called ship station 2 is called in accordance with the connection procedure of the maritime satellite system.

When the connection is completed, the telephone 2 of the land subscriber terminal 5 on the calling side
3 and the telephone 21 of the receiving ship's station 2, and then data transmission begins. In this case, the caller of the land subscriber terminal sends out the tone from the disable tone generator 25 in order to disable the echo suppressor 21 of the international telephone center 4, as explained in the beginning, and also sends out the tone from the disable tone generator 25 in order to disable the echo suppressor 21 of the international telephone center 4, as explained in the beginning. Inform international switchboard 4 of this matter. The operator of the international switchboard sends to the coast earth station 3 selected digits containing the data call identification incorporated into the numbering plan. The shore earth station analyzes the selected digits, confirms that it is a data call, and disables core pandas 19 and 13. Then data transmission begins.

Therefore, in the conventional system, as mentioned above, it is necessary to newly incorporate the identification of the data call path into the numbering plan, and since the system is semi-automatic, it lacks convenience in handling.

FIG. 2 is a diagram showing a relay system according to an embodiment of the present invention. Components in this Figure 2 with the same reference numerals as in Figure 1 are the same or substantially the same as in Figure 1.2 The only differences from Figure 1 are the coast earth station 3 and the ship. The station 2 is provided with enable tone detectors 31 and 32, respectively, for detecting an enable tone for enabling the echo suppressor 21 of the second international exchange 4.

It goes without saying that +? The enable tone detector C is also attached to the echo suppressor 21, but since this is a matter of course, it is omitted.

In the system shown in FIG. 2, the caller at the shore subscriber terminal 5 dials the number of the called ship's station 2 and calls the telephone 1
1 and operating the disable tone generator 25 is exactly the same as in the conventional system shown in FIG. However, in the present invention, preparation for data transmission is completed at the time when the above-mentioned disable tone generator 25 is operated. That is, when the disable tone generator 25 is activated and a disable tone is sent to the international exchange 4, the echo suppressor 21 is stopped. However, the terminal (disabled) is connected to the coast earth station 3 via the communication line, and then to the ship station 2 via the communication satellite l.
reach up to. Therefore, the enable tone detectors 31 and 32 provided in these 52 stations detect the enable tone.

The detection output enables the compander 19 (compression) and the compander 14 (expansion), respectively.

Sunawachieko Sazoresa 21. ! :2 cons/%6
7das 19 and 14 are stopped in response to the transmission of the disable tone, and when the transmission of the enable tone is stopped, preparation for data transmission is completed.

As explained above, the present invention is based on Con A? By equipping the terminal with an echo-sable disable tone detection device, the caller of the land-based subscriber terminal can detect the echo-sable, disable, and two-tone signals by simply sending data from the data terminal.
All three controllers are enabled and ready for data transmission. Therefore, there is no need for identification of data calls in the numbering plan between the coast earth station and the international exchange, and data can be transmitted fully automatically.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a conventional maritime satellite communication system, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. Explanation of symbols 21 is a communication satellite, 2 is a ship station, 3 is a maritime earth station, 4 is an international exchange board, 5 is a land subscriber terminal, 12 is a data terminal, and 13 is a controller. 14 is a converter, 15 and 17 are radio devices, 19 is a converter, 20 is a 1-tone controller, 7.21 is an x co-suppressor, 22 is an international exchange, 24 is a data terminal, and 25 is a disable tone generator. 31 and 32 designate disable tone detectors, respectively.

Claims (1)

[Claims] 1. A coast earth station equipped with a con-gunda, a ship station equipped with a con-irnda and an incoming data terminal and communicating with the coast station via a communication satellite, an echo suppressor connected to the coast earth station, an international switching center equipped with an international switching center, two outgoing data terminals accommodated in the international switching center via communication lines, and an echo suppressor disableable to stop the echo suppressor when transmitting data from the outgoing data terminal. a land subscriber terminal equipped with an oscillator for generating a tone/tone; 1. A control method for controlling a conductor in a maritime satellite communication system, characterized in that the controller is configured to stop its operation in response to the tone detection signal.