JPS6221364A - Noise avoidance system - Google Patents

Abstract

PURPOSE:To prevent a conference made among other subscribers from being disturbed due to noise by providing a distribution block means blocking a signal sent from a subscriber discriminated by a discriminating means to other subscribers to a sound multiplexing device. CONSTITUTION:When a detection section 24-i provided corresponding to each channel chi detects that a voice or noise signal level from each subscriber 3 exceeds a prescribed level, a detection signal xi is outputted. A scanning section 25 scans the detection signal xi at a prescribed period and sends it to a controller 21. The time supervisory section 211 of a controller 21 supervises the continuity time of each detection signal xi and sends a channel chk corresponding to the detection signal xk discriminating the excess of the continuity time over the prescribed time to a disctribution control section 212. The distribution control section 212 gives an instruction to an adder distribution circuit 23 to block that various signals reaching from an incoming channel uk of a channel chk are distributed to the other subscriber 3, and controls a time switch 22 to send a signal tone informing that the transmission from a subscriber 3k is not distributed to the other subscriber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a noise avoidance method in an automatic switching network having a multi-point connection function for unspecified callers.

As part of the diversifying telephone exchange services, attempts are being made to provide multipoint connection services for unspecified callers (-Mei Chatten Hiroba).

An unspecified caller multipoint connection service is a service in which unspecified subscribers select a predetermined telephone number, are connected to a voice multiplexing device installed in a switching network, and can communicate with each other. be.

In this type of unspecified caller multipoint connection service, when a subscriber calls in a noisy place, the noise is transmitted along with the call and is distributed to each subscriber by the voice multiplexing device, so other subscribers It interferes with conversations between people.

Therefore, 1. It is desirable to eliminate noise transmitted from noisy subscribers as much as possible.

[Conventional technology]

FIG. 2 is a diagram showing an example of a conventional multi-point connection system for unspecified callers.

In FIG. 2, a switching network 1 is provided with a voice multiplexing device 2. As shown in FIG. Any subscriber 3 accommodated in the exchange ml,
When a predetermined telephone number is selected for the unspecified caller multipoint connection service, the switching network 1 connects the subscriber 3 to any vacant channel chi (i is 1 to n) of the voice multiplexing device 2.
).

In the audio multiplexing device 2, the control device 21 controls the time switch 22 to select the channel c to which the subscriber 3 is connected.
hi is connected to the addition/distribution circuit 23. In this state, the voice signal sent from the subscriber 3 is transmitted to the addition/distribution circuit 23 via the upstream communication path ui of the channel chi set in the switching network 1 and the time switch 22. The distribution circuit 23 superimposes the audio signals arriving from the uplink path ui of each channel chi, and
is distributed to the downstream communication path di. As a result, each subscriber 3 connected to the audio multiplexing device 2 can listen to the transmissions of each subscriber 3.

In this state, from the subscriber 3 who is talking in a noisy place, the noise is transmitted along with the voice signal to the addition/distribution circuit 23, and distributed to each subscriber 3.

[Problem that the invention seeks to solve]

As is clear from the above description, in some conventional systems, the signals sent by each subscriber 3 connected to the audio multiplexer 2 are always distributed to other subscribers 3 by the addition/distribution circuit 23. Therefore, if noise is transmitted from a specific subscriber, all subscribers 3 will hear the noise, and the noise will be heard by all subscribers 3. This results in an interruption in conversation.

[Means for solving problems]

In general conversation, states in which the audio signal exceeds a predetermined level are distributed within approximately the same amount of time.

The present invention makes use of this phenomenon to detect when the signal level transmitted from each subscriber connected to the audio multiplexing device exceeds a predetermined level in order to distinguish between the audio signal from normal conversation and noise. Detection means for detecting, identification means for identifying a subscriber whose state detected by the detection means has continued for a predetermined period of time or more, and distribution of a signal transmitted from the subscriber identified by the identification means to other subscribers. The audio multiplexing device is provided with distribution means to prevent this from occurring.

[Effect]

That is, according to the present invention, a signal transmitted from a subscriber determined by the audio multiplexing device to transmit noise is not distributed to other subscribers, so that conversations between other subscribers are not caused by noise. will be prevented from being interfered with.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a noise avoidance method according to an embodiment of the present invention. Note that the same reference numerals refer to the same objects throughout the plan.

In FIG. 1, detection sections 24-1 to 24-n are provided corresponding to each channel chl to n, and a time monitoring section 211 and a distribution control section 212 are provided within the control device 21.

In FIG. 1, an arbitrary subscriber 3 desiring an unspecified caller multipoint connection service selects a predetermined telephone number, and the telephone number is set in the switching network 1 and the time switch 22 of the voice multiplexing device 2. They are connected to the addition/distribution circuit 23 via the channel chi, and can communicate with each other via the addition/distribution circuit 23.

In this state, the detection unit 24-1 provided corresponding to each channel chi detects the uplink communication path ui of each channel chi.
The signal level of the voice or noise transmitted from each subscriber 3 via is detected, and when it is detected that the signal level exceeds a predetermined level, a detection signal xi is output.

The scanning section 25 scans the detection signal xi output from each detection section 24 - 1 at a predetermined period, and transmits the scanning result to the control device 21 .

In the control device 21, the time monitoring section 211 is connected to the scanning section 2.
monitor the duration of each detection signal xi transmitted from 5;
A detection signal xk (k is from 1 to n It is determined that the channel Chk corresponding to any one of the following is connected to the noisy subscriber 3k, and is transmitted to the distribution control unit 212.

The distribution control unit 212 instructs the addition and distribution circuit 23 to prevent various signals arriving from the upstream communication path uk of the channel chk transmitted from the time monitoring unit 211 from being distributed to other subscribers 3. , and also controls the time switch 22 to temporarily connect the downlink communication path dk of the channel chk to the notification sound generator 26 to notify that the call from the subscriber 3k will not be distributed to other subscribers 3. Transmit signal sounds.

As a result, each subscriber 3 connected to the addition/distribution circuit 23 is
Hearing the noise transmitted from subscriber 3k is prevented.

Note that subscriber 3 will not be able to send calls to other subscribers 3, but calls from each other subscriber 3 will be sent to the addition/distribution circuit 2.
3 to subscriber 3 via downlink Bdk.
Since the information is also transmitted to subscriber 3, it is possible for subscriber 3 to listen to conversations held by other subscribers 3.

If the subscriber 3k particularly wishes to transmit a call, the noise input to the transmitter is temporarily blocked by, for example, temporarily covering the transmitter with the hand. As a result, the noise is reduced from the signal transmitted to the addition/distribution circuit 23 via the channel chk, so that the signal is transmitted from the detection section 24-k to the time monitoring section 2-1 via the scanning section 25. The detection signal xk stops.

When the time monitoring unit 211 detects that the detection signal xk has stopped, it determines that the noise to the subscriber 3 connected to the channel chk has been reduced, and stops notifying the distribution control unit 212 of the channel chk. Distribution control section 212
Instructs the addition and distribution circuit 23 to distribute the signal arriving from the upstream channel uk of channel chk to other channels Ch since the notification of channel chk has stopped.

As described above, the audio signal transmitted from the subscriber 3k to the addition/distribution circuit 23 via the channel chk is distributed to another channel chi and transmitted to the other subscriber 3.

As is clear from the above description, according to the present embodiment, if the subscriber 3 who makes a lot of noise is affected by the detection unit 24- and the control? Channel chk is identified by the time monitoring unit 211 in the 11 device 21, and the channel
Since the distribution of the signal transmitted via the channel chi to other channels chi is prevented, the noise transmitted from the subscriber 3k is prevented from interfering with the conversation between the other subscribers 3. .

Note that even a subscriber 3 who makes a lot of noise can listen to conversations held by other subscribers 3, and can transmit calls by temporarily suppressing the noise if necessary.

Note that FIG. 1 is merely one embodiment of the present invention, and the configuration of the audio multiplexing device 2, for example, is not limited to that shown in the figure, and many other modifications may be considered. In either case, the effects of the present invention remain the same.

〔Effect of the invention〕

As described above, according to the present invention, in the automatic switching network, since the signal transmitted from the subscriber determined by the voice multiplexer to transmit noise is not distributed to other subscribers, the signal transmitted between the other subscribers is Interference with conversation due to noise is prevented.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a noise avoidance system according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a conventional multi-point connection system for unspecified callers. In the figure, 1 is a switching network, 2 is a voice multiplexing device, 3 is a subscriber, 21 is a control device, 22 is a time switch, 23 is an addition/distribution circuit, 24 is a detection section, 25 is a scanning section, and 26 is a notification sound 211 is a time monitoring unit, 212 is a distribution control unit,
chl to chn are channels, dl to dn are downlink channels, ul to Un are uplink channels, and xl to xn are detection signals.

Claims (1)

[Claims] In an automatic switching network equipped with a multi-point connection function for unspecified callers via a voice multiplexer, detecting that the signal level transmitted from each subscriber connected to the voice multiplexer exceeds a predetermined level. detection means for detecting a subscriber whose condition has been detected by the detection means for a predetermined period of time or more; 1. A noise avoidance system characterized by comprising means for preventing distribution.