JPS59160365A - Automatic answer detector - Google Patents

Abstract

PURPOSE:To secure answer detection by utilizing an audio band signal send from an exchange to a calling subscriber and an answer voice from a called subscriber during call connection for an answer discrimination at a telephone terminal connected to a public communication network. CONSTITUTION:An automatic answer detector 1 monitors the audio band signal on a subscriber line 3 and a voice signal when the called subscriber B answers through an input signal line 21. When the calling subscriber A have a call with the called subscriber B through a public communication network 4, the calling subscriber A sends out a dial number to the subscriber circuit 3 and then controls the start of the automatic answer detector 1 through a signal line 22. The automatic answer detector 1 which starts and enters operation monitors signals on the signal line 21 within an audio band, and when the answer of the called subscriber B is detected, said detection result is reported to the calling subscriber A through the signal line 22.

Description

[Detailed description of the invention] The present invention relates to an automatic telephone response detection device.

Conventionally, in order for the calling subscriber terminal to automatically detect the response of the called party when a telephone is connected, there has been a method of connecting the subscriber terminal to the exchange using a trunk connection, and a method of connecting the subscriber terminal and the exchange using a trunk. A new line other than the two subscriber lines, A line and B line, is installed between the switch and the subscriber line, and a response signal is received via this line. When using the first method of modifying the interface between the exchange and the subscriber terminal into a special one, such as receiving notification of the called party's response, or receiving a specific request from the called party at the time of response, A second method may be used in which a response is detected by sending an audible band signal to the calling party and detecting the signal on the calling party's side.

Among these methods, the first method involves modifying the interface between the exchange and the subscriber terminal into a special one, in which the subscriber who wants to use this method is forced to connect to a special connection with an experienced person. Therefore, it is unreasonable to apply it to all subscribers, and there are drawbacks such as high fees.

In addition, in the second method in which the called party sends a specific audible band signal to the calling party, in order to automatically detect a response, the called party must send a specific audible band signal. The disadvantage is that it cannot be applied to arbitrary called parties.

An object of the present invention is to provide an automatic response detection device that can reliably detect a response even when calling any called party, while still using a general subscriber line as the interface to the exchange. It is on offer.

The automatic response detection device according to the present invention includes an audible band signal detecting means for detecting an audible band signal sent from an exchange to a calling party when a telephone call is connected, and identifying the type of this signal; The device is comprised of a voice detection means for detecting a voice that increases when a response is made, and a determination means for determining whether the call connection is completed based on the audible band signal detector and the voice detection means.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing how an embodiment of the present invention is used. In FIG. 1, calling subscriber A is subscriber line 3.
It is connected to the public communication network 4 via. At the same time, the called subscriber B is connected to the public communication network 4 via the subscriber line 5.

First, to explain the outline of this embodiment, the automatic answer detection device 1 monitors the audible band signal on the subscriber line 3 and the voice signal when the called subscriber B responds via the input signal line 21. . The signal line 22 is a signal line provided to notify the calling subscriber A of the detection result of the automatic response phase detection device 1. In this embodiment, the signal line 22 is bidirectional and is also used when the calling subscriber A controls the activation and deactivation of the automatic response detection device 1. In FIG. 1, when calling subscriber A makes a call to called subscriber B via public communications network 4, calling subscriber A sends dialing digits to subscriber line 3 and Rear signal line 2
2 to control the activation of the automatic response detection device 1. The automatic response detection device l that has started up and entered the operating state is connected to the signal line 21.
When a response from the called subscriber i is detected, the detection result is immediately notified to the calling subscriber A via the signal line 22.

FIG. 2 is a block diagram for explaining the automatic response detection device 1 in FIG. 1 in more detail.

In FIG. 2, the input signal line 21 is the input signal line 2 in FIG.
1, the signal on the input signal line 21 is input to the high impedance buffer circuit 6. The output of the high impedance buffer circuit 6 is distributed to an audible band signal detection circuit 8 and an audio detection circuit 11 via a signal line 7, respectively.

This audible band detection circuit 8 will be explained in more detail with reference to FIGS. 3 and 4.

FIG. 3 is a block diagram showing one embodiment of the audible band detection circuit 8. As shown in FIG. This audible band detection circuit 8 has an input signal line 81
an output measurement circuit 84 that compares the output appearing on the output line 83 of the filter circuit 82 with a preset threshold value; The cadence monitoring circuit 86 monitors the cadence and identifies the type of signal. The type of audible band signal input to the input signal line 81 is output to the output appearing on the output line 87 of the cadence monitoring circuit 86.

FIG. 4 is a time chart of signals exchanged between the blocks shown in FIG. 3. When the audible band signal shown in FIG. 4C is input to the input signal line 81 in FIG. is output above. The signal is compared with a preset threshold value in an output measurement circuit 84. If there is an input having a level above the threshold value, the output appearing on the output line 5 of the output measuring circuit 84 is in the ON state, otherwise it is in the OFF state. The cadence monitoring circuit 86 determines the ON time TO of the signal E.
Based on N and OFF time TOFF, ON time TON
and OFF time TOFF match the expected signal cadence. Here, when the cadence monitoring result matches the expected signal, the cadence monitoring circuit 86 outputs an ON signal to the signal line corresponding to the type of detected signal, as will be described later. In addition, if the parent device (not shown) to which the output line 87 is connected has a processor, the output signal appearing on the output line can be used as the processor's bus, and the cadence monitoring circuit 86 can be arranged as the Ilo or memory of the processor. is also possible. In FIG. 4, the signal F on the signal line 87 is turned on only when the cadence of the output E of the output measuring circuit 84 matches the expected signal cadence for two consecutive periods. This is to prevent false detection from occurring if a component other than the signal, such as noise on the line, happens to match the cadence of the signal.Therefore, it does not necessarily have to be two cycles; It may be set to any period depending on the configuration of the circuit 6.

The output signal appearing on output line 87 of cadence monitoring circuit 86 in FIG. 3 corresponds to the output signal appearing on output line 9.10IC of audio band signal detection circuit 8 in FIG. The voice detection circuit 11 inputs the input signal to a band filter that passes the voice band, and compares the output of the filter circuit with a certain threshold value to determine the level of the voice band signal superimposed on the input signal. Detects signal line 1
2 to the response determination circuit 13. The response determination circuit 13 receives a signal indicating a ringing signal from the audible band signal detection circuit 8 via a signal line 9, and also receives a signal indicating busy tone reception via a signal line 10, while the voice detection circuit 1
1 receives a signal indicating voice detection via a signal line 12.

Next, the operation of the response discrimination circuit 13 will be explained based on FIG. FIG. 5 is a timing chart of the operation of the response discrimination circuit 13. The signal on input signal line 21 is shown at K in FIG. Further, L indicates the start/stop state of the response discrimination circuit 13 controlled via the signal line 22. M indicates the state of the signal indicating that the ringing tone is being received among the outputs of the audible band signal detection circuit 8, and N indicates the state of the signal above the output signal -@-m12 of the voice detection circuit 11. Further, P indicates the state of the signal on the output coding line 22 of the response discrimination circuit 13.

In FIG. 5, the calling subscriber A in FIG. 1 makes a call at time 50, receives the dial tone DT, and sends the called party's numeric information OP at time 51. After sending the numerical information,
At time 52, the called subscriber A activates the automatic response detection device 1. As a result, the signal detection circuit 8 and the voice detection circuit 11 start operating. After this, if the called subscriber B is not busy, the ring tone R is displayed on the input signal line 21.
BT is received. At this time, the signal detection device 8 detects the time 53.
The ring tone detection is finished and the state M on the signal line 9 is OFF.
It changes from to ON. On the signal line 12, this is too early.
An ON state may appear. However, the response determination circuit 13 in which the audible band signal detection circuit 8 detects the ringing tone RBT waits for a sufficient period of time and does not immediately determine a response even when the state N is turned ON. In FIG. 5, when the called subscriber B responds at time 54, the ringing tone RBT disappears, and the called person's voice V appears, the signal detection circuit 8 detects the disappearance of the ringing tone RBT, Change state M to OFF state. The response determination circuit 13 changes from ON to O in state M.
The state P on the signal line 22 is changed from OFF to ON at time 55. Time 56 indicates the time when the calling subscriber A, who has received the response detection information, stops the automatic response detection device 1.

In Figure 5, after receiving a ringing tone after making a call and sending digits,
An example in which the voice of the called party is received has been described. In other cases, for example, when a busy tone is received, the signal detection circuit 8
If the state of the signal line 10 is not ON, the response determination circuit 13 determines that the other party is busy. In addition, if the called party answers before the time 53 at which the ringing tone RBT is confirmed, after the ON state of state N appears, the response determination circuit 13
waits for a sufficient time so that the detection circuit 8 confirms the ringing tone 1 busy tone, and also confirms that the signal lines 9 and 10 are OFF, and determines that the call is answered.

As explained above, the present invention uses the audible band signal sent from the exchange to the calling party when a call is connected and the voice of the called party when responding to determine a response in a telephone terminal connected to a public communication network. By using this method, there is an effect that automatic response determination can be realized while using a general subscriber line as the interface between the exchange and the subscriber line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the usage of an embodiment of the present invention, FIG. 2 is a block diagram for explaining the automatic response detection circuit in FIG. 1 in more detail, and FIG. 3 is a block diagram for explaining the automatic response detection circuit in FIG. A block diagram for explaining the audible band signal detection circuit in more detail, Fig. 4 is a time chart of the operation of the audible band signal detection circuit shown in Fig. 3, and Fig. 5 is a block diagram of the automatic response discrimination circuit shown in Fig. 2. FIG. 3 is a time chart of the operation of FIG. A... Calling subscriber B... Called subscriber 1.
...Automatic response detection device 21...Input signal line 22 of the automatic response detection device...Interface line 3 between the automatic response detection device and the calling subscriber terminal...A is accommodated in the public communication network Calling side subscriber line 5... Called side subscriber line 4 that accommodates B in the public communication network
... public communication network 6 ... high impedance buffer circuit 7 ... output signal line of high impedance buffer circuit 8 ... audible band signal detection circuit 9 ... output signal line 10 for ringing tone reception ... Output signal line for busy tone reception 11 ... Voice detection circuit 12 ...
・Output signal line J3 of audio detection signal...Response 411 separate circuit 81...Input signal line 82...Filter circuit, 83...Output signal line of filter circuit 84...Output reception 1 constant circuit 85 ...Output signal line 86 of the output measurement circuit...Cadence monitoring circuit
87...Output signal line C of signal extraction...Input signal line 1
Upper signal waveform D... Signal waveform E of the output of the filter circuit 82... Output timing chart of the output measurement circuit 84 F... Timing chart of the output of the cadence monitoring circuit 86 TON
... ON time TOFF of the output of the output measurement circuit 84
... OFF' time of the output of the output measurement circuit 84 Applicant
NEC Corporation Figure 1 Figure 2

Claims (1)

[Claims] Audible band signal detection means for detecting an audible band signal sent from an exchange to a called party when a telephone call is connected and identifying the type of this signal; and voice detection for detecting the voice emitted by the called party when responding. and a determining means for determining whether a call connection is completed based on the output signals of the audible band signal detecting means and the voice detecting means.