JPH0218633Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field of the invention> The invention comprises a main device connected to a central office line and a plurality of key telephones, and has a public address function in which the key telephones are provided with a built-in speaker and an external speaker. This invention relates to a button telephone device.

<Technical background> Conventionally, in a button telephone device comprising a main device connected to a central office line and a plurality of button telephones,
In noisy environments, large offices, factories, rooms separated by walls, etc., where you work far away from the key phone, the built-in speaker of the key phone has a low volume, making it difficult to confirm incoming calls. Consideration has been given to connecting an external speaker with a higher volume to the built-in speaker. The external speaker connection method involves installing an external speaker in the main device and a built-in speaker in each button telephone, making simultaneous calls from each button telephone using the external speaker, and using the built-in speaker to listen to the central office line ring tone and extension ring tone. There are methods for displaying and amplifying call audio signals. However, with this method, it is necessary to run a dedicated speaker cable from the main device far away, and if the speakers are grouped to have multiple speakers, a switching circuit must be installed in the main device. The inconvenience was painful. In order to solve this drawback, there is a conventional method in which a signal equivalent to the signal supplied to the built-in speaker of each button telephone is also sent to an external speaker provided corresponding to the button telephone.

<Prior Art and Problems> The present invention relates to the latter of the two conventional examples, and FIG. 1 shows the conventional example of the button telephone device. In Figure 1, 1 is the main device, 2 is the wiring cable, 3 is the calling side button telephone, 4 is the called side button telephone, 4-1 is the built-in amplifier of the button telephone, 4
-2 is a built-in speaker, 5 is an external amplifier, and 6 is an external speaker.

The office line/extension ring tone sent from the main device 1 via the wiring cable 2 and the channel audio signal sent from the calling button telephone 3 are amplified by the built-in speaker 4-2 of the called button telephone 4. A signal equivalent to the signal supplied to the built-in speaker 4-2 is also sent via the external amplifier 5 to an external speaker 6 provided corresponding to the key telephone 4.

However, according to this method, even when the called button telephone 4 is in use, the office line/extension incoming call signal for the called button telephone 4 is amplified by the external speaker 6, resulting in annoying noise.

<Summary of the invention> The present invention was made in view of this drawback, and its purpose is to switch between the built-in speaker 4-2 and the external speaker 6 depending on the type of signal.
The conventional button telephone is provided with a central office line/extension call detection means, a speaker reception detection means, a channel voice detection means, and a speaker switching means for switching between the built-in speaker and an external speaker, and the button telephone is used. To provide a button telephone device with amplification function, which transmits a central office line/extension ringing tone display to an external speaker when the telephone is not in use, and to a built-in speaker when the key telephone is in use.

<Embodiment of the invention> Next, an example of the invention will be described based on a block diagram of a button telephone device with amplification function shown in FIG.

In Figure 2, 2-1 is the call/signal line, 2-2
is a data/power line, 4-3 is a power supply circuit for supplying power supplied from the main device 1 to the key telephone 4 via the data/power line 2-2, and 4-4 is a power supply circuit between the main device 1 and the key telephone 4. 4-5 is a data transmitting/receiving circuit for transmitting and receiving data between the key telephone 4 and the data transmitting/receiving circuit 4-4, and determines whether (a) a central office line/extension call is received or (b) a central office line/extension incoming call. A microprocessor 4-6 for detecting whether a call is being made or (c) a call being received by the built-in speaker 4-2 when a call occurs, and for controlling and processing other operations of the button telephone 4 as a whole. is the call circuit network of the button telephone 4, and 4-7 is the call/signal line to the call circuit network 4-.
6 side and the built-in amplifier 4-1 side, 4-8 is a relay for the changeover switch 4-7, and 4-9 connects the output from the built-in amplifier 4-1 to the built-in speaker 4-2 side. A changeover switch for switching to the external speaker 6 side, 4-10 a relay for the changeover switch 4-9, 4-11 a signal sound source for indicating an incoming call to the built-in amplifier 4-1 during a call, 4
Switches 4-13 to 14 controlled by the microprocessor 4-5 are interlocked switch-12. Note that the same reference numerals as in FIG. 1 indicate equivalent parts.

Next, the operation will be explained based on the flowchart of the speaker selection process of the key telephone device with amplification function shown in FIG.

(a) When the button telephone 4 is in the standby state, when the microprocessor 4-5 detects the arrival of an incoming office line/extension signal via the data/power line 2-2 and the data transmitting/receiving circuit 4-4, the relay 4- 8 is activated, and the changeover switch 4-7 consisting of the contacts of the relay 4-8 is made. Therefore, the signal sent from the main device 1 is amplified by the built-in amplifier 4-1 via the call/signal line 2-1, further amplified by the external amplifier 5, and amplified by the external speaker 6 to display a ring tone. conduct.

(b) When the key telephone 4 is in use, the microprocessor 4-5 checks with the switch 4-13 that the switches 4-13 and 4-14 are on to indicate that a call is in progress, and sends the office line/extension incoming call signal. When the arrival of the signal is detected via the data/power line 2-2 and the data transmitting/receiving circuit 4-4, the relay 4-10 is activated, causing the changeover switch 4-9 consisting of the contacts of the relay 4-10 to be closed, and the switch 4-12 is turned on, the signal from the signal sound source 4-11 is input to the built-in amplifier 4-1 and amplified, and amplified sound is sent out from the built-in speaker 4-2.

(c) When the key telephone 4 is in the middle of a call and a speaker is used to receive the voice on the channel, when a key switch (not shown in the drawing) for receiving the speaker is turned on, the microprocessor 4-5 switches on the relays 4-8 and 4-1.
0 to selector switches 4-7 and 4-9.
is turned on, and the call path audio of the call/signal line 2-2 is output from the built-in speaker 4- via the built-in amplifier 4-1.
Amplified sound is sent from 2.

On the other hand, if the speaker is not listening, relay 4-
8 and 4-10 are both in the recovery state.

In the embodiment, a relay contact is used as the changeover switch, but it is clear that an electronic switch may also be used.

<Effects of the invention> As explained above, according to the present invention, the office line/extension incoming signal and the communication path voice signal are used depending on the signal type, and the office line/extension incoming signal is used when the button telephone is on standby. When an incoming call arrives, the ringtone is sent to the external speaker, and when the incoming call arrives during a call, it is sent to the built-in speaker.If the call path audio signal is received by the speaker, the built-in speaker is used to press the button. In addition to improving the functionality of telephone equipment,
When installing an external speaker, you only need to wire it from the key phone that requires an external speaker, so it is easy to install, requires fewer materials and parts, and has extremely practical effects in terms of economy and workability. big.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional key telephone device with amplification function, FIG. 2 is a block diagram showing an embodiment of the key telephone device with amplification function according to the present invention, and FIG.
The figure is a flowchart showing the speaker selection process of the button telephone device according to the present invention. 1...Main device, 2...Wiring cable, 3, 4...
...Button telephone, 4-1...Built-in amplifier, 4-2
... Built-in speaker, 4-3 ... Power supply circuit, 4-4
...Data transmitting and receiving circuit, 4-5...Microprocessor, 4-6...Telephone circuit network, 4-7 and 4-
9... Changeover switch, 4-8 and 4-10... Relay, 4-11... Signal sound source, 4-12... Switch, 4-13 and 4-14... Hook switch, 5... External amplifier, 6 ...External speaker.

Claims (1)

[Scope of utility model registration request] It consists of a main device connected to the office line and a plurality of button telephones, an incoming call signal sound source during a call, a speaker circuit consisting of a built-in speaker and an external speaker with a high amplification installed externally, and a communication system with the speaker circuit. Switching between a built-in speaker and an external speaker in a key telephone that has a microprocessor that controls circuits within the key telephone using a switching circuit that connects and switches one of the circuit networks to a communication path and a control signal from the main device. A speaker switching circuit is provided for connection to the call path side, and the microprocessor identifies the state of the key telephone and controls the switching circuit and the speaker switching circuit to detect when an incoming call is received while on standby. In case, the call path is connected to an external speaker and the incoming call signal from the main device is used to make the sound, and when a call is received during a call, the incoming call signal sound source is connected to the internal speaker and the sound is made to sound, and when the speaker receives the call, the call path is A button telephone device with a public address function, characterized in that the button is connected to an internal speaker.