JPS633496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic response detection device, and particularly to an automatic response detection device for non-telephone terminals that communicate with telephones over a telephone network.

Conventionally, when a non-telephone terminal accommodated in a telephone network makes a call and communicates with a telephone, a response from the telephone has been detected by stopping the ringback tone of the receiving station. That is, as shown in FIG.
When a call is transmitted to the telephone 11 via the originating station 13 and the terminating station 12, the terminating station 12 transmits the ringer and ring back tone from the ringer trunk 16 and the ring back tone trunk 15 to the telephone 1.
1. Send to non-telephone terminal 14. When the receiving station 12 detects a response from the telephone 11, it stops transmitting the ringer and ringback tones. Non-telephone terminal 1
4 monitors the ringback tone from the receiving station 12 after dialing is completed, and detects a response from the telephone 11 when the ringback tone stops.

However, with conventional detection means, the ring back tone detection means must be changed every time the ring back tone specifications of the receiving station change, and in a telephone network where the ring back tone specifications differ from station to station, the number of called stations is This method has disadvantages in that it requires multiple ring back tone detection means, and it is also necessary to identify the receiving station and select an appropriate ring back tone detection means.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a response detection device capable of detecting a telephone response without depending on the receiving station.

According to the present invention, there is provided a tone generation circuit for sending a tone to a telephone, a delay circuit for delaying the tone, a tone detection circuit for detecting the tone returning via a sidetone circuit of the telephone, and a four-wire A hybrid circuit that outputs the tone input from the side line to the 2-line side and outputs the tone input to the 2-line side to the other 4-line side line, the tone transmission time period of the tone generation circuit, and the tone detection of the tone detection circuit. There is obtained an automatic response detection device characterized in that it includes a control circuit that controls the operations of the tone generation circuit and the tone detection circuit so that the time periods do not overlap.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing one embodiment of the present invention. After dialing is completed, the tone generating circuit 23 connected to the four-wire side transmission line of the hybrid circuit 22 sends out a tone according to instructions from the control circuit 25. The transmission tone is 2 by the hybrid circuit 22.
However, at this time, the return loss of the hybrid circuit 22 goes around to the 4-wire side receiving line. On the other hand, the tone sent to the 2nd line side is sent to the delay circuit 2.
The signal is transmitted from the originating station to the terminating station with a delay of a preset time in step 1.

If telephone 20 does not answer, the tone is terminated. When the telephone 20 answers and a path is established between the automatic answer detection device and the telephone 20, the tone passes through the sidetone circuit of the telephone 20, returns to the automatic answer detection device, and passes through the delay circuit 21. The hybrid circuit 22 transmits the signal to the 4-line receiving line. 4
A tone detection circuit 24 connected to the line-side receiving line operates under the direction of a control circuit 25 to detect tones on the receiving line during operation. Hybrid circuit circuit 22
The control circuit 25 instructs the tone generation circuit 23 and the tone detection circuit 24 to operate in alternating periods so that the tone detection circuit 24 does not operate due to the tone transmitted to the receiving line due to the return loss.

The timing of tone transmission and detection is shown in FIG. FIGS. 3a, 3b, and 3c show the tone sending timing, tone detection timing, and tone timing on the 4-line receiving line, respectively. After dialing,
The tone generating circuit 23 sends out a tone at a tone sending timing 31 of period T, while the tone detecting circuit executes tone detection at a tone detecting timing 32 which is an inversion of the tone sending timing 31. The tone corresponding to the return loss of the hybrid circuit 22 is on the 4-wire side receiving line at the tone timing 33.
This is the tone detection timing 32.
The tone is not detected because it does not overlap. On the other hand, when the telephone 20 responds, the tone that has come from the sidetone circuit passes through the delay circuit 21 and the hybrid circuit 22 and appears on the 4-wire side receiving line at tone timing 34. The tone timing 34 and the tone detection timing 32 overlap each other for a time t ₀ that is twice the sum of the delay time of the delay circuit 21 and the delay time of the subscriber line, and a tone is detected. Detection of the tone allows the non-telephone terminal to confirm that the telephone has answered.

Telephone sidetone is approximately 10 decibels, making it more sensitive than subscriber line losses combined. The tone detection circuit can be easily implemented using, for example, an existing push button receiver.

Further, the delay time of the delay circuit 21 may be set to more than half the reaction time of the tone detection circuit 24, and the delay time in the subscriber line works in the direction of increasing the detection time. The delay circuit 21 can easily realize a delay time of several tens of milliseconds using a charge coupled device or the like. The tone sending timing 31 may be set to be longer than the reaction time of the tone detection circuit 24.

As explained above, when a non-telephone terminal and a telephone communicate over a telephone network, the present invention allows the non-telephone terminal to respond without making any modifications to the telephone or the telephone network, and without specializing the operation of the telephone. Can be detected.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining conventional response detection, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a timing diagram showing the operation of the embodiment of the present invention. 11, 20...Telephone, 12, 13...Switchboard, 1
4... Non-telephone terminal, 15... Ringback tone trunk, 16... Ringer trunk, 21... Delay circuit, 22... Hybrid circuit, 23... Tone generation circuit, 24... Tone detection circuit, 25... Control circuit,
31...Tone sending timing, 32...Tone detection timing, 33, 34...Tone timing.

Claims (1)

[Claims] 1 A hybrid circuit that outputs a signal input from a first 4-wire side circuit to a 2-wire side and outputs a signal input to this 2-wire side to a second 4-wire side circuit, and a 2-wire side of the hybrid circuit. a delay circuit connected between the telephone set and the delay circuit for delaying signal transmission; and a tone generation circuit connected to the first four-wire side line, the tone generating circuit is connected to the telephone set and generates a tone signal to the telephone set via the hybrid circuit and the delay circuit. a tone generating circuit for transmitting a tone, and a tone detecting circuit connected to the second 4-wire side line, the tone detecting circuit is connected to the delay circuit and the tone detecting circuit for transmitting a tone that is transmitted to the telephone and reflected through a sidetone circuit of the telephone. A tone detection circuit detects a tone via a hybrid circuit, and the tone generation circuit and the tone detection circuit detect a tone so that a time period in which the tone generation circuit sends out a tone and a time period in which the tone detection circuit detects a tone do not overlap. 1. An automatic response detection device comprising: a control circuit that controls the operation of the circuit;