JPH05236134A - Incoming call circuit during talking - Google Patents

Abstract

PURPOSE:To avoid generation of noise and to eliminate an unnatural feeling by adding a voice signal of an opposite subscriber, an incoming notice tone during talking and a voice signal converted from a 3rd party caller number in terms of amplitude till the connection to the 3rd party is switched. CONSTITUTION:A voice conversion circuit 24 converts a caller number of a 3rd party inputted in advance from a terminal 25 into a voice signal and outputs the signal. Furthermore, an adder circuit 23 adds an intermittent notice tone received from a notice tone generating circuit 22 and a voice signal converted from a 3rd party caller number received by a voice conversion circuit 24 to a voice signal from an opposite subscriber B to a subscriber A received at an input terminal 12 in terms of amplitude to generate a voice signal and it is sent to the subscriber A. On the other hand, the voice signal from the subscriber A to the opposite subscriber B fed to the input terminal 14 is sent to the subscriber B as the voice signal via a direct coupling path 26 and an output terminal 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call waiting circuit used in an automatic exchange.

[0002]

2. Description of the Related Art An automatic exchange for controlling connection of telephones has a function of permitting an interruption call during a call. That is, when a call is made from a third party to one of the telephones during a call between the two telephones, the exchange notifies the one telephone to that effect, and when the subscriber responds by a hooking operation, the other telephone is called. While holding the call path to the other phone, the call path to the third party is enabled by connecting the call path to the third party, and the call path to the held phone is re-established by the hooking operation accompanying the end of the interrupt call. By connecting, the call can be resumed.

As shown in FIG. 3, when a call from the third party C to the subscriber A occurs during a call between the subscriber A and the subscriber B, the subscriber A waits for an interruption call by hooking operation. In the meantime, the subscriber A and the subscriber B have a call path switch 1
Is connected via the incoming call circuit 2 during a call.

The voice signal of the subscriber B is the speech path switch 1
Is transmitted to the subscriber A via the input terminal 12, the selector 17a and the output terminal 11 of the incoming call circuit 2. On this occasion,
The notification sound output from the notification sound generation circuit 15 for notifying the occurrence of the incoming call is in the voice signal to the subscriber A by the selector 17a.

The voice signal of the subscriber A is converted into the speech path switch 1, the input terminal 14 of the incoming call receiving circuit 2, and the selector 17.
It is transmitted to the subscriber B via b and the output terminal 13. At this time, the output of the silence generating circuit 16 is inserted into the voice signal to the subscriber B by the selector 17b. The switching timing of the selectors 17a and 17b is determined by the selector control circuit 18
Controlled by.

Incidentally, in FIG. 3, 3 is a ring tone (R
BT) is a ringing tone generation circuit.

FIG. 4 is a waveform diagram exemplifying the insertion timings of the notification sound and the silence, and the signal waveforms in which these are inserted into the audio signal.

At the same time that the selector control circuit 18 activated by the activation signal S1 generates the selector switching signal S2 having a predetermined period, the notification sound generation circuit 15 and the silence generation circuit 16 generate the notification sound α and the silence β of the predetermined frequency, respectively. Generated, subscriber A and subscriber B receive signals as illustrated in a and b, respectively.

[0009]

In the above-mentioned conventional call waiting circuit, the subscriber A receives the voice of the subscriber B until the connection switching to the third party C is performed in response to the hooking operation of the subscriber. And the incoming call notification sound is switched and sent.
Since the voice and the silence are switched and transmitted, noise of various frequency components is generated at the time of switching between the voice and the signal sound as shown by the waveforms a'and b'in FIG. 4, which deteriorates the communication quality. There's a problem.

Further, it is impossible to notify the target subscriber of the calling subscriber information only by notifying the incoming call sound that there is an incoming call during the call.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an in-call incoming circuit which is capable of reducing noise generation noise, improving call quality, and notifying the calling subscriber information.

[0012]

In order to achieve the above-mentioned object, the call waiting circuit according to the present invention makes a connection request to a subscriber by a third party generated during a call between a subscriber and a partner subscriber. Until the subscriber switches the connection to the third party based on the hooking operation of the subscriber, the subscriber's voice, call alert sound, and third It has means for generating and transmitting an amplitude addition sound of a signal obtained by converting the caller's number of a person into a voice signal, and means for transmitting the voice of the subscriber as it is to the other subscriber.

[0013]

[Operation] Until the connection is switched to the third party based on the hooking operation of the subscriber, the voice signal of the other party's voice, the incoming call notification sound and the caller number of the third party are voice signaled to the subscriber. The amplitude addition signal of the converted signal is generated and transmitted, and the voice of the subscriber is continuously transmitted to the other subscriber as it is, thereby eliminating noise and unnaturalness caused by continuous disconnection of the voice signal. Is configured to.

Further, it has a function of notifying the subscriber of the caller number in the incoming call during a call by converting the caller number information of a third party into a voice signal and transmitting the voice signal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a speech path switch, 2 is a call receiving circuit, and 3 is a ringing tone generating circuit. A, B,
C is a subscriber telephone, but for convenience of explanation, A is a subscriber,
In the following description, B is the other subscriber and C is the third party.

The incoming call circuit 2 during call is a transmission signal output terminal 11 to the subscriber A, an input terminal 12 for a voice signal from the other subscriber B, and an output terminal 13 for a transmission signal to the other subscriber B.
And a voice signal input terminal 14 from the subscriber A. Further, an input terminal 20 for the activation signal S1, a timing generation circuit 21, and a circuit 22 for generating an incoming call notification sound during a call.
And a calling number input terminal 25 of the third party C, a voice conversion circuit 24 for converting the calling number of the third party C into a voice signal, a voice signal, an incoming call notification sound during a call, and a voice signal of the calling number. And an adder circuit 23 for

The timing generation circuit 21 has an input terminal 20.
When the activation signal S1 for the incoming call is received from, a timing signal having a predetermined cycle as shown by a waveform t in FIG.

The notification sound generation circuit 22 generates a notification sound of an incoming call during a call having a predetermined frequency which starts at zero phase in synchronization with the rising of the timing signal t supplied from the timing generation circuit 21, and outputs the timing signal t. This notification sound is stopped in synchronization with the falling edge. As a result, the notification sound γ is intermittently generated as shown by the waveform γ in FIG.

Further, the timing circuit 21 generates a timing signal as shown by the waveform k in FIG. 2 which is synchronized with the falling edge of the timing signal t in the audio conversion circuit 24.

The voice conversion circuit 24 converts a third party caller number input in advance from the terminal 25 into a voice signal and outputs the voice signal.

In the adder circuit 23, the intermittent notification sound γ received from the notification sound generation circuit 22 and the voice conversion circuit 2 are added to the voice signal from the other subscriber B to the subscriber A received at the input terminal 12.
The signal obtained by converting the third party's calling number received from 4 into a voice signal is amplitude-added to generate a voice signal as shown in a of FIG. 2 and this is sent to the subscriber A.

On the other hand, the subscriber A supplied to the input terminal 14
A voice signal from the other party to the subscriber B is sent to the subscriber B via the direct connection path 26 and the output terminal 13 as the voice signal shown by the waveform b in FIG.

In this embodiment, the subscriber A to the partner subscriber B
The configuration is shown in which the call path to the other party subscriber B is connected to the signal output terminal to the other party subscriber B through the direct connection path. The current state may be maintained until the hooking operation is performed by the subscriber A without being pulled into the middle incoming circuit.

[0025]

As described above, the call waiting circuit of the present invention provides the subscriber with the notification sound and the third sound until the call path is switched based on the hooking operation of the subscriber. Since the configuration is such that the person's calling number converted into a voice signal is added in amplitude, the amount of noise generated can be reduced and the call quality can be improved. Furthermore, the function of notifying the caller number can be realized by converting the caller number into a voice signal and transmitting the voice signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an operation timing chart of the present invention.

FIG. 3 is a block diagram showing a conventional example.

FIG. 4 is an operation timing chart of a conventional example.

[Explanation of symbols]

 1 Call path switch 2 Call receiving circuit 3 Ring tone generating circuit 11 Output signal output terminal to subscriber A 12 Input terminal for voice signal from partner subscriber B 13 Output signal output terminal to partner subscriber B 14 Join Voice signal input terminal 20 from person A Start signal input terminal 21 Timing generation circuit 22 Notification sound generation circuit 23 Adder circuit 24 Voice signal conversion circuit 25 Caller number input terminal

Claims (1)

[Claims] 1. In a call waiting circuit that processes a connection request to a subscriber by a third party that occurs during a call between the subscriber and the other subscriber, connection to the third party based on the hooking operation of the subscriber. Until switching, for the subscriber, the voice of the other subscriber,
A means for creating and transmitting an incoming call notification sound, an amplitude addition sound of a signal obtained by converting a third party's caller number into a voice signal, and a means for transmitting the subscriber's voice as it is to the other subscriber. And a call waiting circuit.