JPS639237A - Conference talking system utilizing satellite line - Google Patents

Abstract

PURPOSE:To attain quick and smooth progress of a conference without any time lag by driving and controlling to a reception interrupting circuit and a radio equipment based on a comparison output of power levels between the transmission and reception. CONSTITUTION:The transmission of a subscriber 10 is inputted to a transmission power level detection circuit 3 via a transmitter 1, the output of the circuit 3 is supplied and inputted to a comparator circuit 5 and sent to a radio equipment 30. The voice of other subscribers 11, 12 is inputted to a reception power level detection circuit 4 via a reception interruption circuit 6. When the subscribers 11, 12 are not communicated together, the output of the circuit 4 is absent and the result is fed to the comparator circuit 5. The output of the circuit 5 is absent in case either the presence of the output of the circuit 4 or the absence of the output of the circuit 3 exists and the receive voice from the equipment 30 is sent to a receiver 2 via the circuit 4 as it is. In an opposite case, the output of the circuit 5 is present to interrupt the circuit 6 to make the reception side silent and the voice of the subscriber 10 is sent to other subscriber from the equipment 30 via a satellite 70.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a conference call system using a satellite line capable of multiple access.

(Prior Art) Conventionally, as shown in FIG. A method is adopted in which the voices of subscribers to and 11 and 12 are mixed in the conference trunk device 90.The mixing method is to add analog audio signals as they are in an adding circuit 91, or to convert the audio signals into digital signals. In the case of conversion, there are methods such as selecting one signal with the highest audio power level in order to make the device economical, or a method of calculating and synthesizing multiple signals.

(Problems to be Solved by the Invention) However, the conventional conference call system described above requires a conference trunk device, and because the conference trunk device processes signals, information is transmitted and then received by the other party. There was a problem in that there was a time lag before the process was completed.

The present invention has been made in view of the above-mentioned problems, and provides a conference call system that allows a meeting to proceed quickly and smoothly without causing a time lag between sending information and receiving it at the other party. The purpose is to provide.

(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the above objects, the conference call system provided by the present invention includes a transmitting/receiving device having a transmitter and a handset, and a conference call device. and a wireless device are arranged at each of a plurality of subscribers, transmitting call information of any subscriber from its own wireless device, and relaying the transmitted call information via a satellite placed in the center. This is a conference call system that uses a satellite line for transmission to other subscribers, and includes a transmitting power level detection circuit that detects the transmitting power level of the handset and a receiving power level that detects the receiving power level of the handset. A detection circuit, a comparison circuit that compares the output of the receiving power level detection circuit and the output of the transmitting power level detection circuit, and a receiving cutoff circuit that cuts off signal output from the wireless device to the receiver, are provided in each of the conference call devices. , and the reception cutoff circuit and the wireless device are drive-controlled based on the comparison output of the comparison circuit.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an example in which three subscribers are having a conference call. FIG.

The transmitted voice of the subscriber 10 is input to the transmitted voice power level detection circuit 3 via the transmitter 1. The output of the transmitting power level detection circuit 3 becomes "present" and is input to the quality comparison circuit 5 and also sent to the wireless device 30.

Further, the voices of other subscribers 11 and 12 are inputted to the reception power level detection circuit 4 via the reception cutoff circuit 6. At this time, if other subscribers 11 and 12 are not transmitting,
The output of the reception power level detection circuit 4 becomes "absent" and is input to the comparison circuit 5.

The comparison circuit 5 outputs "absent" if either the output of the receiving power level detection circuit 4 is "absent" or the output of the detection circuit 3 is "absent".
becomes. In the opposite case, the received power level detection circuit 4
When the output of is "absent" and the output of the transmitting power level detection circuit 3 is "yes", the output of the comparison circuit 5 is "yes"
It has the following functions. If “None” is selected here, “L”
” level, or if it is “present”, it is preferable to output the FT (J level). In the example shown in FIG. 2, the comparator circuit 5
The output becomes "Yes", and the reception cutoff circuit 6 and the wireless device 3
Sent to 0. When the output from the comparator circuit 5 is "Yes", the reception cutoff circuit 6 cuts off the connection between the reception side, that is, the wireless device 30 and the handset 2, and sends the received audio signal to the reception power level detection circuit 4 in a silent state. state. In the opposite case, that is, when the output from the comparator circuit 5 is "no", the wireless device 30
The received audio signal received from the receiver is directly transmitted to the receiver 2 via the receiver power level detection circuit 4. In the example shown in FIG. 2, the reception cut-off circuit 6 is in the cut-off state, and the voice of the subscriber 10 is relayed to the satellite 70 via the up channel 50, and from the satellite 70 via the down channel 60 to all wireless devices 30, 31. .32, the input of the own voice signal to the handset 2 of the subscriber 10 is prohibited to prevent echo. Since the reception cutoff circuits built into the subscribers 11 and 12 are in an off state, that is, not in a cutoff state, the subscriber 10 can be heard.

The same applies if the speaker changes.

Wireless devices 30, 31, and 32 simultaneously
In order to prevent interference caused by outputting radio waves to
Each comparison circuit 5 sets the comparison output as "yes" when the own subscriber is talking and another subscriber is listening, and transmits the output to its own wireless device to control the corresponding wireless device, Radio waves are output only during the period when the output of the comparison circuit is "present".

Although the present invention has been described with respect to audio conference calls, it can also be applied to video. That is, the same effect can be obtained by using a camera as a transmitter and a picture tube as a receiver.

(Effects of the Invention) As described above, according to the present invention, a transmitting/receiving device having a transmitter and a handset, a conference call device, and a wireless device are arranged on each of a plurality of subscribers. A conference call system that uses a satellite circuit to transmit information from one subscriber's voice from its own wireless device, relay the transmitted voice information via a centrally located satellite, and transmit it to other subscribers. In each of the conference call devices, a transmitting power level detection circuit for detecting a transmitting power level of the transmitter, a receiving power level detecting circuit for detecting a receiving power level for the handset, and the receiving power level detecting circuit. a comparison circuit that compares the output of the transmitting power level detection circuit with the output of the transmitting power level detection circuit, and a receiving cutoff circuit that cuts off signal output from the wireless device to the handset, And since the wireless device is driven and controlled, the conference can proceed quickly and smoothly without any time lag from when the caller sends the call information until it is received by the other party. This has the effect of being able to.

Further, the present invention uses a satellite line to enable conference calls between remote locations and at the same time achieves the effect of suppressing echoes.

Brief explanation of surface aspects FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing an example of a conference call between three subscribers, and FIG. 3 is a diagram showing an example of a conventional conference call. This is a diagram.

DESCRIPTION OF SYMBOLS 1... Transmitter, 2... Receiver, 3... Transmitting power level detection circuit, 4... Receiving power level detection circuit, 5.
... Comparison circuit, 6... Call blocking circuit, 10... Subscriber, 11... Subscriber, 12... Subscriber, 20...
Conference call device, 21... Conference call device, 22... Conference call device, 30... Radio device, 31... Radio device, 32... Radio device, 40... Antenna, 41...
・Antenna, 42... Antenna, 50... Up channel, 60... Down channel, 70... Satellite,
80... Telephone exchange, 9o... Conference trunk device, 91... Addition circuit.

Claims (1)

[Claims] A transmitting/receiving device having a transmitter and a handset, a conference call device, and a wireless device are arranged on each of a plurality of subscribers, and the transmitting information of any subscriber is transmitted from its own wireless device, and A transmission power level for detecting the transmission power level of the transmitter in a conference call system using a satellite line in which transmitted transmission information is relayed via a centrally located satellite and transmitted to other subscribers. a detection circuit, a receiving power level detecting circuit for detecting a receiving power level for the handset, a comparison circuit for comparing an output of the receiving power level detecting circuit with an output of the transmitting power level detecting circuit; A satellite line characterized in that each of the conference call devices is provided with a reception cutoff circuit that cuts off signal output to the conference call device, and the reception cutoff circuit and the wireless device are driven and controlled based on the comparison output of the comparison circuit. A conference call method using .