JPH0728334B2 - Nuisance call avoidance phone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a so-called silent telephone, a mischievous telephone that disconnects immediately after answering, and a telephone that avoids nuisance calls such as erroneous call reception by a non-telephone terminal having an automatic calling function. It is about.

(Prior Art and Its Problems) With the spread of telephones in recent years, various mischievous telephones have been increasing in number and becoming a social problem. Regarding the breakdown, "silent phone" where the called party does not speak anything
Moreover, there is a survey result that the number of "immediate disconnect calls" to which the busy tone reaches the callee is overwhelming because the callee disconnects as soon as the callee answers.

There is an invention of Japanese Patent Laid-Open No. 61-90559 as a telephone capable of automatically repelling a "silent telephone", but a telephone that automatically repels the above "immediate disconnect telephone" without the operation of the called party. Is not found yet.

The facsimile signal system has a function of stopping transmission by a time-out when the signal sequence is not established, such as when the called terminal has a normal telephone function.
However, there is a drawback in that it takes at least a few seconds to time out. That is, for the called party,
As soon as you pick up the handset, you will hear annoying signal tones, and the automatic outgoing call function of the outgoing call terminal will repeat this incoming call, resulting in great pain.

An object of the present invention is to provide a telephone capable of preventing a caller from being annoyed by a silent call, an immediate disconnection call, or an erroneous call reception by a terminal other than the call.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an automatic response means for automatically answering an incoming call when an incoming call is received without calling the called party, A determination means for determining the presence or absence of an in-band signal arriving from the transmission side within a fixed period after the response, and whether the in-band signal is a predetermined signal when the in-band signal arrives from the transmission side within the fixed period In a telephone having identification means for identifying whether or not an in-band signal arrives from the calling side and the predetermined signal does not arrive within the fixed period, the called party is called while holding the incoming call. Calling means and call disconnecting means for automatically disconnecting the incoming call when the predetermined signal arrives from the originating side within the certain period or when the in-band signal does not arrive from the originating side. Specially having To collect.

(Operation) According to the present invention, when there is an incoming call, the incoming call is automatically answered by the automatic answering means without calling the called party, and within a band reached from the calling side after a fixed period after the automatic answer. The presence or absence of the signal is determined by the determining means, and when the in-band signal arrives from the transmission side within a certain period, the identifying means determines whether or not the in-band signal is a predetermined signal, and within the certain period. When the in-band signal arrives from the calling side and the predetermined signal does not reach, the called party is called while holding the incoming call by the calling means, and the predetermined signal arrives from the calling side within the certain period. In this case, or when the in-band signal does not arrive from the calling side, the call disconnecting means automatically disconnects the incoming call.

(Embodiment) FIG. 1 shows a schematic configuration of a telephone showing an embodiment of the present invention. Here, as an example of a predetermined signal, that is, an in-band signal other than the real voice, a case where a function for detecting a busy tone and a facsimile signal is provided will be described.

Reference numeral 1 is a call start detection circuit that detects an incoming call from a calling terminal by reversing the potentials of the subscriber lines L1 and L2, reaching a ringing AC current, and the like. Reference numeral 2 is a loop switch that creates and releases a current loop in the telephone at the time of answering an incoming call or ending a call. 3 is a dial circuit using a multi-frequency generation circuit, 4 is a call circuit for matching the input / output of the call voice with the circuit in the telephone, and 5 is an addition / selection circuit, which is the voice from the transmitter and from the CPU 13 described later. The analog voice output is added or selected and input to the call circuit 4.

Reference numeral 6 denotes a signal sound A detection circuit, which is constituted by a 400 Hz resonance circuit, an active filter circuit, a 400 Hz interruption detection circuit, etc. having a busy sound detection function as an example of an in-band signal other than the real voice. Reference numeral 6'denotes a signal sound B detection circuit, which is constituted by a resonance circuit having a plurality of audible frequencies at resonance points or an active filter circuit for realizing a facsimile signal detection function as an example of an in-band signal other than the real voice. When it is desired to detect a signal other than these signals other than the real voice, the signal sound detection circuit may be added in parallel with the signal sound A detection circuit 6 or the signal sound B detection circuit 6 '.

7 is a position detection switch circuit, which is a handset 8 described later.
Detects whether it is physically on-hook or off-hook, and unlike conventional telephones, the operation of this circuit does not directly interlock with the switch 2. Reference numeral 8 denotes a handset having a transmitter and a receiver, for communicating with the other party, and 9 denotes an alerting circuit as a calling-out display means, which is composed of an electronic buzzer. Reference numeral 10 is a sound detection circuit as a means for detecting the presence or absence of an in-band signal, and it is possible to identify that the state in which the electrical waveform, electrical energy level, etc. is clearly higher than the steady noise level has continued for a certain time In addition, it is composed of a level discriminating circuit having a certain threshold level, a Schmitt trigger circuit, and the like. Reference numeral 11 is a keypad for inputting the other party's number when making a call, and 12 is a digital / analog conversion circuit (D / A) for adding a guidance message for automatically answering the incoming call without calling the called party. To be supplied as an analog audio signal. Reference numeral 13 denotes a control circuit (CPU) for controlling the entire telephone set, which is constituted by a multiprocessor or the like. Reference numeral 14 is a random access memory circuit (RAM) for temporarily storing data used for control work of the CPU 13, and 15 is a read-on for storing a control program used by the CPU 13 and a voice message supplied to the addition selection circuit 5 as digital data. A memory circuit (ROM). 16 is an input / output circuit (I / O), 17 is a rectifier circuit, and 18 is an internal bus. The loop switch 2, the CPU 13 and the D / A 12 constitute an automatic response means.

In order to explain these operations, the case where an incoming call is received by the telephone of FIG. 1 will be described.

An incoming call is detected by the call detection circuit 1 by the potential reversal of the subscriber's line in the case of a general public telephone network, the arrival of a bell ringing AC current in a private branch exchange such as a PBX of some sort, and through the I / O 16 ( In the following explanation, to avoid complication, the explanation of I / O16 operation is omitted.) CPU
Reported at 13. The CPU 13 closes the loop switch 2 to form a direct current loop on the subscriber line and displays the response to the incoming call to the exchange. Next, the voice data of the response message stored in the ROM 15 is read out and converted into an analog voice signal by the D / A 12. It is desirable that the contents of the message be devised so that, for example, the name of the caller is asked together with the name of the callee, and effective information is extracted from the caller.
The digital-analog converted voice signal is sent to the calling terminal through the addition / selection circuit 5 and the calling circuit 4, and through the call path established with the calling terminal.

If the caller does not intend to make a silent call or an immediate disconnection call and makes a normal call, it can be expected to make a meaningful reply to the above response message. When the caller replies, it is detected as a voiced state by the voiced sound detection circuit 10, and its real voice is clearly distinguished from a busy voice or the like. Therefore, the signal sound A detection circuit 6 or the signal sound B detection circuit 6 is detected. 'Is not detected. These pieces of detection information are reported to the CPU 13. When recognizing these reports, the CPU 13 determines that the call is a normal incoming call, and activates the alerting circuit 9 for the first time to call the called party. When the called party picks up the handset 8, an off-hook is detected by the position detection circuit 7, and the CPU 13 stops the alerting circuit 9 in response to this, so that the called party can talk with the calling party.

When the caller intends to make a silent call, no response is returned to the above response message within a certain period of time. This state is detected by the sound detecting circuit 10 as a silent state and is reported to the CPU 13. When the CPU 13 recognizes this situation, it determines that the call is a nuisance call, and the alerting circuit 9
Without activating, the loop switch 2 is opened to disconnect the DC loop, thereby notifying the exchange of the end of call from the receiving side. That is, the called party can repel this without being bothered by the silent call.

If the caller intends an immediate disconnect call, the action is to disconnect while the auto-reply message is being sent, rather than making a meaningful reply to the above reply message. This operation corresponds to the case where the caller side is disconnected first, and in this state, the busy tone is sent to the receiving terminal in the public telephone network and most private branch exchanges. This state is detected as a voiced state by the voiced sound detection circuit 10 and is also reported to the CPU 13 by the signal sound A detection circuit 6 as detection of a busy sound. When the CPU 13 recognizes these situations, it determines that the call is a nuisance call and opens the loop switch 2 to disconnect the DC loop without activating the alerting circuit 9. That is, the called party can repel this without being bothered by the instant disconnect call.

Next, a case of an erroneous incoming call from a facsimile terminal having an automatic calling function will be described.

In this case, according to the facsimile signaling method, the calling terminal sends a signal with a combination of a plurality of audible frequencies intended for communication channel setting to the called terminal regardless of the response message. This state is detected as a voiced state by the voiced sound detection circuit 10 and the CPU 1 detects that a facsimile incoming signal is detected by the signal sound B detection circuit 6 '.
Reported in 3. When the CPU 13 recognizes these situations, it determines that the call is a nuisance call and opens the loop switch 2 to disconnect the DC loop without activating the alerting circuit 9. That is, the called party can repel this without being bothered by an erroneous incoming call from the facsimile terminal.

The circuit operation described above is an example of operation using signal processing by an analog circuit, but voice / busy sound discrimination is also possible by digital signal processing using the processing capacity of the CPU 13.
In this case, a program equivalent to the function of the signal sound A detection circuit 6 or the signal sound B detection circuit 6'or the sound detecting circuit 10 is added to the control program stored in the ROM 15, and the signal sound A detection circuit 6 or The signal sound B detection circuit 6'or the voiced sound detection circuit 10 can be realized by replacing it with a single analog-digital conversion circuit.

In this way, nuisance calls can be automatically avoided.

(Effects of the Invention) As described above, according to the present invention, an incoming call is automatically answered without calling the called party, and no in-band signal is detected from the other party within a certain time after answering. If, or if the in-band signal from the other party is a predetermined signal, the automatically answered call is disconnected, and if the in-band signal from the other party arrives within a certain time and the predetermined signal does not arrive. Only by calling the called party, there is an advantage that the called party does not have to be bothered by junk phone calls that are frequently presented to silent calls or instant disconnect calls, and nuisance calls such as false calls from automatic outgoing faxes. is there.

[Brief description of drawings]

FIG. 1 is a block diagram of a telephone showing an embodiment of the present invention. 1 ... call signal detection circuit, 2 ... loop switch circuit, 3 ... dial circuit, 4 ... communication circuit, 5 ... addition selection circuit, 6 ... signal sound A detection circuit, 6 '... signal sound B
Detection circuit, 7 ... Position detection switch circuit, 8 ... Handset, 9 ... Alerting circuit, 10 ... Sound detection circuit, 11 ... Keypad, 12 ... Digital / analog conversion circuit (A / D) , 13 ... Control circuit (CPU), 14 ... Random access memory circuit (RAM), 15 ... Read-only memory circuit (ROM), 16 ... Input / output circuit (I / O).

Claims (1)

[Claims] 1. An automatic response means for automatically answering an incoming call when the incoming call is received without calling the called party.
A discriminating means for discriminating the presence or absence of an in-band signal arriving from the transmitting side within a fixed period after the automatic response, and the in-band signal is a predetermined signal when the in-band signal arrives from the transmitting side within the fixed period. In a telephone having an identifying means for identifying whether or not an in-band signal arrives from the calling side and the predetermined signal does not arrive within the certain period, the called party is held while holding the incoming call. Calling means for calling, and a call disconnection for automatically disconnecting the incoming call when the predetermined signal arrives from the originating side within the certain period or when the in-band signal does not arrive from the originating side. A nuisance call avoidance telephone set having means.