JPH07336428A - Key telephone system - Google Patents

Abstract

PURPOSE:To prevent the neibouring persons from being annoyed by the line tones generated in a key telephone system by providing a telephone line polarity inversion detecting part to detect an off-hook state of the opposite party side and then starting a speaker or an informing signal generating part. CONSTITUTION:A polarity inversion detecting part 10 consists of a comparator 11 and recognizes the inversion of polarity of a telephone line. The telephone line is connected to the plus and minus input sides of the comparator 11. Meanwhile the output side of the comparator 11 is pulled up via a resistor and connected to a control part 2. When a call operation is carried out by means of a speaker phone function, the part 10 detects the off-hook state of a telephone set of the opposite party side. Then the control means 2 outputs a command for the first time to a voice signal processing part 1 to transmit the voice signal of the opposite party side received from the telephone line to a speaker 5. Thus the voices of the opposite party side are sent to the receiver side through the speaker 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone having a speakerphone function.

[0002]

2. Description of the Related Art In recent years, a key telephone device has a function of redialing a telephone number once dialed by a sender (hereinafter referred to as a redial function), as disclosed in Japanese Patent Laid-Open Nos. 4-87444 and 4-177952. , Has come to have a function (hereinafter, a speakerphone function) that allows a sender to talk without picking up the receiver. Furthermore, it has become possible to use this speakerphone function to dial without taking the handset.

A conventional key telephone device will be described below with reference to FIG. FIG. 3 is a block diagram of a conventional button telephone device. In FIG. 3, 1 is a voice signal processing unit, 2 is a control unit for controlling the entire telephone device, 3 is a telephone line connection interface unit, and 4 is a telephone line network. Reference numeral 5 is a speaker, 6 is a redial button, 7 is a speakerphone button, 8 is a speaker volume setting volume, 9 is a redial telephone number memory section, and 13 is a keypad for inputting a telephone number. Here, the speaker volume setting volume 8 is provided with volume switching of two stages (no volume, medium volume), and no sound is output from the speaker 5 at no volume. As for the medium volume, a sound of medium volume can be heard from the speaker 5 by the volume setting.

The operation of the conventional key telephone device configured as described above will be described below. When the sender uses the speakerphone function with the conventional button telephone device, the user first presses the speakerphone button 7 to operate the speakerphone function. At this time, the control unit 2 recognizes that the speakerphone button 7 has been pressed and sends a command to the voice signal processing unit 1 to transmit the dial tone signal from the telephone network 4 to the speaker 5. The voice signal processing unit 1 transmits the dial tone signal to the speaker 5, and the dial tone is heard from the speaker 5. In this case, the speaker volume setting volume 8 is set to the medium volume. After that, the sender uses the keypad 13 to input a telephone number in order to make a call, or
Press the redial button 6. In the case of making a call by the redial function, the control unit 2 recognizes that the redial button 6 has been pressed, and dials the telephone number previously dialed by the sender, which is stored in the redial telephone number memory unit 9. When the dialing of the telephone number is completed and the other party's telephone is not busy, the ring back tone sent from the telephone line network 4 is sent to the voice signal processing unit 1 via the telephone line connection interface unit 3 and the speaker 5
When a ring back tone is heard and the other party goes off-hook, the other party's voice is sent from the telephone network 4 to the voice signal processing section 1 via the telephone line connection interface section 3, and the other party's voice is output from the speaker 5. hear. When the other party's telephone is busy, the busy tone sent from the telephone line network 4 is sent to the voice signal processing unit 1 via the telephone line connection interface unit 3, and the busy tone is heard from the speaker 5.

[0005]

However, in the above-described conventional button telephone device, when the sender uses the speakerphone function in the presence of a plurality of people in the office such as in the office of the company, the surrounding The dial tone, ringback tone, and busy tone are annoying to people in the world. In order to eliminate this annoyance, if the speaker volume setting volume is set to silent, the sender will get dial tone, ring back tone,
Since the busy tone and the voice of the other party cannot be recognized, the connection of the telephone line cannot be confirmed, and there is a problem that the call cannot be made.

The present invention solves the above problems and provides a key telephone device which allows a sender to make a call after recognizing the other party's off-hook, without giving the surrounding people the trouble of a noise source. It is an object.

[0007]

In order to achieve the above object, the present invention adds a polarity reversal detection unit for recognizing the polarity reversal of a telephone line.

[0008]

According to the present invention, in the above-mentioned structure, when a calling operation is performed by using the speakerphone function, the telephone line polarity reversal detection unit detects off-hook of the other party's telephone,
After this, for the first time, the control means issues an instruction to the voice signal processing section to transmit the voice signal of the other party from the telephone line to the speaker, so that the voice of the other party can reach the sender from the speaker.

[0009]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG. The same numbers are used for the same components as those described in the conventional example.

FIG. 1 is a block diagram of a key telephone device according to a first embodiment of the present invention. In FIG. 1, 1 is a voice signal processing unit, 2 is a control unit for controlling the entire telephone device, and 3 is a telephone. Line connection interface section, 4 telephone line network, 5 speaker, 6 redial button, 7 speakerphone button, 8 speaker volume setting volume, 9 redial telephone number memory section, 10 telephone line polarity reversal detection section , 11 is a comparator, and 13 is a keypad for inputting a telephone number. Here, the speaker volume setting volume 8 is provided with volume switching of two stages (no volume, medium volume), and no sound is output from the speaker 5 at no volume. For the medium volume, set the volume setting to the medium volume of the speaker 5.
Can be heard from. Further, the telephone line polarity reversal detection unit 10 is
It is composed of the comparator 11, and the telephone line is connected to the plus input and the minus input of the comparator 11 via a resistor. The output side of the comparator 11 is pulled up via a resistor and connected to the control unit 2.

The operation of the key telephone device of the present embodiment having the above-described structure will be described below. When the sender uses the speakerphone function with the button telephone device, first, the user presses the speakerphone button 7 to operate the speakerphone function. At this time, the control unit 2 recognizes that the speakerphone button 7 has been pressed, but does not send the voice signal processing unit 1 a command to transmit the dial tone signal sent from the telephone network 4 to the speaker 5. The voice signal processing unit 1 does not transmit the dial tone signal to the speaker 5, and the speaker 5 does not hear the dial tone. After that, the sender uses the keypad 13 to input a telephone number in order to make a call, or
Press the redial button 6. In the case of making a call by the redial function, the control unit 2 recognizes that the redial button 6 has been pressed, and dials the telephone number previously dialed by the sender, which is stored in the redial telephone number memory unit 9. After dialing the telephone number, if the other party's telephone is not busy, a ring back tone sent from the telephone line network 4 is sent to the voice signal processing unit 1 via the telephone line connection interface unit 3, but control is performed. Part 2
Does not transmit a command to send the ringback tone signal to the speaker 5 to the audio signal processing unit 1, so that the ringback tone cannot be heard from the speaker 5. When the other party goes off-hook, the polarity of the telephone line is reversed. At this time, the comparator 1 of the telephone line polarity reversal detection unit 10 connected to the telephone line via the telephone line connection interface unit 3
Positive input and negative input of 1 are inverted and comparator 1
The electrical level of the No. 1 output terminal changes (for example, low level: 0 V to high level: 5 V). Detecting this level change, the control unit 2 recognizes the polarity reversal of the telephone line. After that, the control unit 2 sends a command to the voice signal processing unit 1 to transmit the voice signal from the telephone line to the speaker 5. For the first time, the other party's voice is sent from the telephone line network 4 to the voice signal processing section 1 via the telephone line connection interface section 3, and the other party's voice is heard from the speaker 5. At this time, the sender can recognize the off-hook of the other party by the voice of the other party and start the call.

(Embodiment 2) FIG. 2 is a block diagram of a key telephone device according to a second embodiment of the present invention. In FIG.
1 is a voice signal processing unit, 2 is a control unit for controlling the entire telephone device, 3 is a telephone line connection interface unit, 4 is a telephone line network, 5 is a speaker, 6 is a redial button, 7 is a speakerphone button, and 8 is Speaker volume setting volume, 9 is a redial telephone number memory unit, 10 is a telephone line polarity reversal detection unit, 11 is a comparator, 12 is a notification signal generation unit that generates a signal to notify the sender of off-hook of the other party, and 13 is a telephone It is a keypad for entering numbers. Here, the speaker volume setting volume 8 is provided with a two-step volume switching (no volume, medium volume), and no sound is emitted from the speaker 5 at no volume. With regard to the medium volume, a medium volume can be heard from the speaker 5 with the volume setting. Further, the telephone line polarity reversal detection unit 10 includes a comparator 11
The telephone line is connected to the plus and minus inputs of the comparator 11 via a resistor.
The output side of the comparator 11 is pulled up via a resistor and connected to the control unit 2.

The operation of the key telephone device of this embodiment having the above-described structure will be described below. When the sender uses the speakerphone function with the button telephone device, first, the user presses the speakerphone button 7 to operate the speakerphone function. At this time, the control unit 2 recognizes that the speakerphone button 7 has been pressed, but does not send the voice signal processing unit 1 a command to transmit the dial tone signal sent from the telephone network 4 to the speaker 5. The voice signal processing unit 1 does not transmit the dial tone signal to the speaker 5, and the speaker 5 does not hear the dial tone. After that, the sender uses the keypad 13 to input a telephone number in order to make a call, or
Press the redial button 6. In the case of making a call by the redial function, the control unit 2 recognizes that the redial button 6 has been pressed, and dials the telephone number previously dialed by the sender, which is stored in the redial telephone number memory unit 9. After dialing the telephone number, if the other party's telephone is not busy, a ring back tone sent from the telephone line network 4 is sent to the voice signal processing unit 1 via the telephone line connection interface unit 3, but control is performed. Part 2
Does not transmit a command to send the ringback tone signal to the speaker 5 to the audio signal processing unit 1, so that the ringback tone cannot be heard from the speaker 5. When the other party goes off-hook, the polarity of the telephone line is reversed. At this time, the comparator 1 of the telephone line polarity reversal detection unit 10 connected to the telephone line via the telephone line connection interface unit 3
Positive input and negative input of 1 are inverted and comparator 1
The electrical level of the No. 1 output terminal changes (for example, low level: 0 V to high level: 5 V). Detecting this level change, the control unit 2 recognizes the polarity reversal of the telephone line. After that, the control unit 2 issues a command to the voice signal processing unit 1 and the notification signal generation unit 12 to generate a signal to notify the sender of the off-hook of the other party, and the notification sound is heard from the speaker 5. Next, the control unit 2 sends a command for transmitting the voice signal from the telephone line to the speaker 5. For the first time, the other party's voice is sent from the telephone line network 4 to the voice signal processing section 1 via the telephone line connection interface section 3, and the other party's voice is heard from the speaker 5.

[0014]

As is apparent from the above description, according to the present invention, a telephone line polarity reversal detection unit for detecting the off-hook of the other party at the time of calling is provided, and after detecting the off-hook of the other party, a speaker or a notification signal is generated. It is possible to provide a button telephone device in which the sender recognizes the other party's off-hook and can make a call without inviting other people to feel annoyed by the line sound emitted from the telephone device, by controlling the remote control unit to be activated. .

[Brief description of drawings]

FIG. 1 is a block diagram of a key telephone device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a key telephone device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional key telephone device.

[Explanation of symbols]

 1 Audio signal processing unit 2 Control unit 3 Telephone line connection interface unit 4 Telephone line network 5 Speaker 7 Speakerphone button 8 Speaker volume setting volume 10 Telephone line polarity reversal detection unit 12 Notification signal generation unit 13 Keypad

Claims (2)

[Claims] 1. A control unit for controlling the entire telephone device, and a keypad for inputting a telephone number, which is connected to the control unit.
A speakerphone button for activating a speakerphone function connected to the control unit, a speaker volume setting volume connected to the control unit, a telephone line connection interface unit connected to a telephone line network, and the telephone line connection interface. A telephone line polarity reversal detection unit whose input is a signal from the control unit and whose output is connected to the control unit; and a voice signal processing unit which is connected to the control unit and inputs and outputs a signal to and from the telephone line connection interface unit. Comprising a speaker connected to the audio signal processing unit, and performing a calling operation using the telephone number input keypad when the speakerphone function is activated by the speakerphone button, The telephone line polarity reversal detection unit detects off-hook of the other party's telephone, and thereafter,
For the first time, the control unit issues a command to the voice signal processing unit to transmit the voice signal of the other party from the telephone line to the speaker, and the button telephone device that enables the voice of the other party to reach the sender from the speaker. . 2. A control unit for controlling the entire telephone device and a notification signal generation unit connected to the voice signal processing unit are added,
When the speakerphone function is activated by the speakerphone button and the call operation is performed using the telephone number input keypad, the telephone line polarity reversal detection unit detects the off-hook of the other party's telephone, After that, for the first time, the control unit issues a command to the audio signal processing unit to transmit the notification signal from the notification signal generation unit to the speaker, and the notification sound reaches the sender from the speaker, and at the same time, the control unit outputs the audio signal. A button telephone device in which a processing unit is instructed to transmit the voice signal of the other party from the telephone line to the speaker, and the voice of the other party can reach the sender from the speaker.