JPH0198399A - Terminal adaptor for satellite communication - Google Patents

Abstract

PURPOSE:To connect a telephone set to a satellite communication system by converting a voice signal from the telephone set into a digital data, sending it to a station, processing call control information relating to the voice signal and the data from a terminal into a packet respectively and sending it to the station. CONSTITUTION:Call control information from a telephone set 4 is fed to a call control information detection circuit 23 via a telephone interface 25 and it is detected in the circuit 23, and packet processing is applied by a packet encoder/decoder 21. The data inputted from terminals 31-3n is processed into a packet by the packet encoder/decoder 21. The data and call control information subject to packet processing are multiplexed and sent to a slave station 1 together with a voice signal from the telephone set 4 converted into an ADPCM data by a telephone CODEC 24. The slave station 1 applies multiplexes the packet data, the packet call control information and the ADPCM data relating to the voice signal to be a serial signal and sends the result to a master station via a communication satellite.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal adapter for satellite communication suitable for use in a satellite communication system and the like.

[Summary of the invention]

This invention converts the voice signal from the telephone into digital data and transmits it to the station, and also packetizes call control information related to the voice signal from the telephone and data from the terminal and transmits it to the station. This allows the analog telephone to be directly connected to the satellite communication system.

[Conventional technology]

In general, in satellite communication systems where a communication satellite has a parent station and multiple slave stations, the slave stations and the master station can communicate directly with each other via the communication satellite, but slave stations can communicate with each other via the communication satellite. cannot directly communicate with each other, and transmits via the master station.

In other words, information is transmitted from one slave station to the master station via a communication satellite, and then the information is further transmitted to the other slave station via the communication satellite.

In such a satellite communication system, the only information that can be obtained from a terminal provided on the user side is generally data.

[Problem that the invention seeks to solve]

By the way, in a satellite communication system where a master station and multiple slave stations exist for a communication satellite, essentially only data can be transmitted as mentioned above, so in order to transmit voice, it is necessary to connect an analog telephone directly to the satellite communication system. It was impossible to do so.

The present invention has been made in view of the above circumstances, and provides a terminal adapter for satellite communication that allows an analog telephone to be directly connected to a satellite communication system.

[Means for solving problems]

The terminal adapter (2) according to this invention is a telephone set (
a converting means (24) for converting the voice signal from the terminal (4) into digital data; a detecting means (23) for detecting call control information related to the voice signal;
,~3. ．． ) and a packet forming means (21) for packetizing the data from the converting means and the packet forming means, respectively, and is configured to transmit the output signal of the converting means and the output signal of the packet forming means to the station.

[Effect]

The operator & (24) converts the voice signal from the telephone (4) into digital data. For example, in the case of a slave station,
Since the data capacity of the uplink (slave station - master station) is small, the conversion means (24) converts the voice signal from the telephone (4) into 54 Kbps PCM data, and further converts it into 32 Kbps or 16 Kbps PCM data, for example. A
DPC! Convert to J data to compress data capacity. The detection means (23) detects call control information related to the voice signal (picking up the handset, dialing the other party's number, ringing the bell, hanging up the handset, etc.). This call control information and general data from the terminals (31 to 3.) are respectively packetized by the packet forming means (21). The packetized data and call control information are then transmitted to the station (1), and the converted digital data is transmitted to the station (1). This connects the analog phone directly to the satellite communications system. be able to.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings, taking as an example the case where it is applied to the slave station side.

(1) is a slave station, (2) is a terminal adapter,
A plurality of terminals (3,) to (3°) and a telephone (4) are connected via this terminal adapter (2).

The terminal adapter (2) includes a packet encoder/decoder (21), a slave station interface (22), a call control information detection circuit (23), and a telephone codec (Coder).
&De-coder) (24) and a telephone interface (25).

The terminals (3I) to (3o) have a display, an operation board, etc. (not shown), and asynchronous data entered manually here is packetized by a packet encoder/decoder (21) and synchronized packet data. becomes.

Further, when call control information is generated by hooking off, hooking on, or dialing in the telephone (4), this call control information is supplied to the call control information detection circuit (23) via the telephone interface (25). This detected call control information is sent to the packet encoder.
It is supplied to a decoder (21) and packetized.

The data and call control information packetized in this way are multiplexed at the slave station interface (22) and
).

Also, the voice signal from the telephone (4) is supplied to the telephone codec (24) via the telephone interface (25), where it is converted into 64 Kbps PCM data, and further converted into 32 Kbps or 16 Kbps LvADPC!
J data is converted to compress the data capacity. This is because the data capacity of the uplink from the slave station to the master station is small. This compressed ADP
C! J data is transmitted to the slave station (1) via the slave station interface (22).

The slave station (1) multiplies and serializes the packet data, packet call control information, and ADPC λ1 data related to the voice signal transmitted to the slave station (1), performs the necessary signal processing, and transmits the data to the communication satellite (Fig. (not shown) to a master station (not shown). The information received by the master station is further transmitted to the other party's slave station via a communication satellite.

Also, the other party's slave station → communication satellite → master station → communication satellite → slave station (
The packet data and packet call control information transmitted via the communication channel 1) are supplied to the packet encoder/decoder (21) via the slave station interface (22), where the packet data is converted into asynchronous data. It is converted and supplied to the terminals (31) to (3,). on the other hand,
The call control information is supplied to the telephone interface (25), where a driving signal according to the content of the call control information is formed, and this driving signal is supplied to the telephone set (4).
) is sounded, etc. Necessary actions are taken depending on the content of the call control information.

Further, the ADPCM data related to the audio signal transmitted in the same manner as described above is supplied to the telephone codec (24) via the slave station interface (22), where the 64
The signal is converted into PCM data at 1 bps, and further converted into an analog voice signal and supplied to the telephone (4) via the telephone interface (25).

In this way, data and audio signals can be transmitted and received between the slave stations and the same dome.

In addition, although the above-mentioned embodiment is a case where the terminal adapter according to the present invention is applied to a slave station, it can be similarly applied to a master station. However, since the data capacity of the downlink from the master station to the slave station is relatively large, the telephone codec (24) converts 64 bps PCM data into 32 Kbps ADP CM data of 16 Kbps. There's no need.

〔Effect of the invention〕

As described above, according to the present invention, the voice signal from the telephone is converted into digital data and transmitted to the station, and the call control information related to the voice signal from the telephone and the data from the terminal are each packetized. Since it is possible to directly connect an analog telephone to a satellite communication system, it is especially useful for satellite communication systems where a communication satellite has a parent station and multiple slave stations. be.

[Brief explanation of the drawing]

The figure is a circuit configuration diagram showing an embodiment of the present invention. (1) is a slave station, (2) is a terminal adapter, (3,)
~(3,) is a terminal, (4) is a telephone, (21) is a packet encoder/decoder, (22) is a slave station interface, (23> is a call control information detection circuit, (24)
is a telephone codec, and (25) is a telephone interface. Agent Paige Ito
Hide Matsukuma Seitoumi Daisetoi 41-
Ding Fu, Pa\°Drawing Procedure Amendment Letter February 18, 1986 Director General of the Patent Office Kunio Ogawa 1986 Patent Application No. 255687 3 Relationship with the case of the person making the amendment Patent Applicant Address Tokyo 6-7-35 name for parts illustrations (2
18) Sony Corporation Representative Director Norio Ohga 4, Agent 6, Number of inventions increased by amendment (1) The scope of claims in the specification will be amended as shown in the attached sheet. (2) In the specification, page 2, line 2 “Packetize and send to the station”
(3) Correct "multiplexing" to "multiplexing" on page 6, line 19. (4) Same, page 8, lines 4-8 “However, from the parent station...
There's no need. ” to be deleted. The above claims include converting means for converting a voice signal from a telephone into digital data; detection means for detecting call control information related to the voice signal; and converting the call control information and data from the terminal into packets, respectively. 1. A terminal adapter for satellite communication, comprising: a packet forming means for converting a signal into a packet, and transmitting an output signal of the converting means and an output signal of the packet forming means to a satellite communication ground station.

Claims (1)

[Claims] Conversion means for converting a voice signal from a telephone into digital data; detection means for detecting call control information related to the voice signal; and converting the call control information and data from the terminal into packets, respectively. 1. A terminal adapter for satellite communication, comprising: a packet forming means for converting a signal into a packet, and transmitting an output signal of the converting means and an output signal of the packet forming means to a station.