JPH0131745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to conveniently realize a loudspeaker receiving function in which a received signal is heard from a speaker in a telephone set, the present invention provides a method for switching from a handset call state or standby state to a loudspeaker receiving state, or from a handset call state to a loudspeaker receiving state. This invention relates to a loudspeaker receiving state switching method for switching the operation to a standby state or a standby state.

FIG. 1 shows a block diagram of an example of a system for switching the loudspeaker reception state that has been proposed so far. In Figure 1,
This figure shows the case of a digital telephone that transmits and receives control signals such as incoming voice, dialing signals for making and receiving calls, and calling signals in a time-sharing manner using digital signals via an exchange.

In Fig. 1, 1 and 2 are subscriber line terminals;
3, 3', 3'' are the interlocking make contacts of the lock-type loudspeaker switch, 4 is the contact of the power switch, 5 is the diode bridge, 6 is the power separation circuit, 7 is the digital telephone circuit, 8 is the power supply circuit, and 9 is the dial. , 10 is a transmitter, 11 is a receiver, 12 is a loudspeaker, 13 is a receiving channel, and 14 is a transmitting channel.

Now, in Figure 1, as a loudspeaker switch, 3
A lock-type switch with make contacts 3, 3', and 3'' is used, and the contacts 3, 3', and 3'' operate in conjunction with the press of the loudspeaker switch (hereinafter abbreviated as LS).
Contact 3 closes the subscriber line loop when the loudspeaker switch LS is pressed, allowing current to be supplied to the power supply circuit 8 and signals to be transmitted to the digital telephone circuit 7, and contact 3' closes the subscriber line loop when the loudspeaker switch LS is pressed. When the loudspeaker switch LS is pressed, the receiving channel 13 connected to the transmitting channel 11 is switched to be connected to the loudspeaker speaker 12, and the contact 3'' disconnects the transmitter 10 from the transmitting channel 14. The contact point 3'
It's starting to work sooner. FIG. 2 shows an explanatory diagram of the state transition of the digital telephone due to the on/off operation of the switch (hereinafter abbreviated as HS, 4 is the contact point of HS) and the loudspeaker switch LS.

In Fig. 2, 21 is the switch HS;
22 indicates a standby state in which the loudspeaker switch LS is both turned off, 22 indicates a handset talking state in which the loudspeaker switch HS is on and the loudspeaker switch LS is off, and 23 indicates the handset switch HS.
is off and the loudspeaker switch LS is on, and 24 is the handset talking state where both the HS switch and the loudspeaker switch LS are on.

In the same figure, the amplification is done using a lock-type loudspeaker switch.
Indicates LS, and the ↑ or ↓ mark indicates its operating direction.

Off-hook from standby state 21
When the HS is turned on), the handset is in the talking state 22. In this state, even if the loudspeaker switch LS is pressed and turned on, the handset talking state 24 is maintained. Furthermore, when the user turns off the hook (turns off the hook switch HS) from this state, the amplified voice receiving state 23 is entered. Then, from that state, the loudspeaker switch LS
If the switch is turned off, the system returns to the standby state 21.

Also, from the standby state 21, the loudspeaker switch LS
When turned on, the telephone enters the loudspeaker receiving state 23, and while the phone is turned on, it is possible to make a call using the dial 9, and the loudspeaker can be received without changing the dial. When the user goes off-hook (turns on the hook switch HS) from this state, the handset call state 24 is entered. Furthermore, even if the loudspeaker switch LS is turned on in this state, the handset talking state 22 is maintained. If the user turns on the hook (turns off the hook switch HS) from this state, the device returns to the standby state 21.

As explained above, the loudspeaker listening switch in the loudspeaker listening state switching method proposed so far
For LS, when receiving a loudspeaker, contact points 3, 3', 3''
It is necessary to use a lock type switch to keep the loudspeaker in the open state at all times, and in addition, when the loudspeaker switch is pressed and the loudspeaker 12 is connected to the receiving channel 13 by the contact 3', the transmitting If the transmitter 10 is not disconnected from the transmitting channel 14, howling may occur due to acoustic coupling between the transmitter 10 and the speaker 12.
In order to prevent the speaker 12 from being connected at the same time (it is okay to disconnect both), it is necessary to use a complex switch with a mechanism that guarantees the order of contact operation as a loudspeaker switch, which has the disadvantage of being expensive. Ta.

Furthermore, when switching from the loudspeaker receiving state to the handset talking state, state 23 in Figure 2 changes to state 24 by turning on the off-hook (handset switch HS is turned on); Then, the state becomes 23, and in order to return to the standby state 21, it is necessary to further press (turn off) the loudspeaker switch LS.
There are disadvantages such as forgetting to turn off the phone and leaving the phone connected to the line, and pressing the loudspeaker switch LS from the handset talking state 22 does not change to the loudspeaker receiving state, which is unnatural. Ta.

The present invention has been made in order to solve the various drawbacks of the prior art as described above, and therefore, the purpose of the present invention is to make the telephone more economical by making the loudspeaker switch non-locking, and to prevent users from forgetting to turn off the loudspeaker switch. It is an object of the present invention to provide a loudspeaker reception state switching system that enables prevention of problems and simplification of operating procedures.

The main points of the configuration of the present invention are that, in a telephone set, a loudspeaker, a first switch for switching the speaker on and off, a second switch for switching the handset on and off, and a subscriber line In order to open and close the loop, a third switch consisting of an electronic switch is provided with a non-lock type loudspeaker receiving switch and a switch control circuit composed of a logic circuit, and the third switch is provided with a non-locking type loudspeaker receiving switch and a switch control circuit composed of a logic circuit, and is configured to turn on/off the non-locking type loudspeaker receiving switch. handset off-hook,
The switch control circuit controls opening/closing of the first to third switches so that the on-hook operation transitions between four states: a standby state, a handset talking state, an on-hook loudspeaker receiving state, and an off-hook loudspeaker receiving state. The point is that I tried to do it.

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

FIG. 3 is a circuit diagram showing one embodiment of the present invention, and shows the case of a digital telephone. Third
In the figure, the same numbers as in FIG. 1 indicate corresponding parts, 31 is a switch control circuit, 32 is an electronic switch, 33, 33' are contacts that operate in conjunction with the depression of a non-locking loudspeaker switch, 4' is a contact that operates in conjunction with contact 4 when the switch is pressed, 34 is an AND gate, 3
5 is an inverter, 36 is a D flip-flop, 3
7 is an OR gate, 38 and 39 are power-on reset circuits, 40 is an OR gate, 41 and 42 are time constant circuits, and 43, 44, 45, and 46 are electronic changeover switches, respectively.

FIG. 4 shows the waveforms of various signals generated in each part a to k of the switch control circuit 31 when the switch HS and the loudspeaker switch LS are turned on/off in the embodiment of the present invention shown in FIG. The timing chart and the state transition of the telephone are shown in FIG. 5, respectively. Note that the numbers of the transition states shown in FIG. 5 are added at the bottom of FIG. 4.

In the embodiment shown in FIG.
A non-locking switch with two make contacts 33 and 33' is used as the LS, and when the switch LS is pressed and the contact 33 is turned on, the local power supply voltage is applied to the power supply circuit 8 via the power separation circuit 6, and the power supply circuit 8 The switch control circuit 31 operates due to the output voltage +V, and the output (k) of the switch control circuit 31 causes
Before the contact 33 turns off, the electronic switch 3
2 is turned on and the subscriber line loop is held;
The local power supply voltage continues to be supplied to the power supply circuit 8. The circuit of FIG. 3 operates as shown in the timing chart of FIG. 4.

As shown in FIG. 4, in the circuit shown in FIG. 3, the first press of the loudspeaker switch LS allows the user to enter the loudspeaker receiving state, and then the off-hook switches to the handset talking state, or the second press of the loudspeaker switch LS You can return to the standby state by pressing the button. Thereafter, by pressing the loudspeaker switch LS, the state can be changed as shown in FIG. 4 or FIG. 5.

In addition, in Figure 3, the loudspeaker switch LS
The output (j) of the switch control circuit 31 in response to the depression of the electronic selector switch 4 is transmitted via the time constant circuit 41.
4 is turned on, so electronic selector switch 4
3 and 46 are turned off, the transmitting and receiving handsets 10 and 11 are disconnected from the transmitting and receiving communication paths 14 and 13, and the electronic changeover switch 45 is turned on via the time constant circuit 42, and the loudspeaker 12 is switched on to the receiving communication path. 1
Connected to 3. In addition, the time constant circuit 41 makes the charging time constant small and the discharging time constant large, and the time constant circuit 42 makes the charging time constant large and the discharging time constant small, so that when the loudspeaker switch LS is pressed, the electronic changeover switch 43 and 45 are turned on at the same time, the transmitter 10 and the loudspeaker 12 are connected at the same time, and the structure can be configured so that howling does not occur.

In FIG. 5, 51 is in a standby state (both the switch HS and the loudspeaker switch LS are off);
Reference numeral 52 indicates the handset talking state (HS on, LS off), 53 indicates the on-hook loudspeaker receiving state (HS off, LS on), and 54 indicates the off-hook loudspeaker receiving state (both HS and LS are on).

The difference between Fig. 5 and Fig. 2 is that in Fig. 2, 24 is in the handset talking state, whereas in Fig.
4 indicates the loudspeaker receiving state, and 23 in Fig. 2.
When off-hook (HS turned on) from the loudspeaker receiving state (HS off, LS on), the handset becomes 24 handset talking states (both HS and LS on), whereas in Fig. There are two points: when going off-hook (HS on) from 52 (HS on, LS on), the handset goes into a 52 handset talking state (HS on, LS off). Therefore, the loudspeaker receiving state 53
5 by off-hooking (turning on HS) from
2, the handset is in the talking state, and when the call is finished, the handset is turned off (HS is turned off), and the telephone enters the standby state 51, and the telephone is disconnected from the line. Furthermore, by pressing the loudspeaker switch (turning on LS) from the handset talking state of 52, the loudspeaker receiving state can be entered even if the handset is off-hook without having to keep pressing the loudspeaker switch.

As explained above, the loudspeaker receiving state switching method according to the present invention does not require guaranteeing the order of contact operation as a loudspeaker receiving switch, uses a simple two-make contact non-lock switch, and the switch control circuit is Can be configured with a simple logic circuit,
It is inexpensive because it has a structure that can easily be integrated with other telephone circuits into LSI or microprocessor control. In addition, when switching from the on-hook loudspeaker receiving state to the handset talking state, by going off-hook (turning on HS) from state 53 in FIG. If you turn it off), it goes into standby mode 51, which is convenient because you don't have to press the loudspeaker switch again.
There is no chance of forgetting to turn off the loudspeaker switch and leaving the telephone connected to the line. Furthermore,
By pressing the loudspeaker switch from the handset talking state 52, the user can immediately switch to the loudspeaker state 54 even while off-hook, and the operation is natural.

The effects described above are exhibited not only in the case of the digital telephone described above as an example, but also in the case where the present invention is applied to a current analog telephone.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional loudspeaker reception state switching system, and FIG. 2 is an explanatory diagram showing the state transition of a digital telephone in the switching system of FIG. 1.
Fig. 3 is a circuit diagram showing an embodiment of the present invention, Fig. 4 is a timing chart showing waveforms of various signals in the circuit of Fig. 3, and Fig. 5 is a state transition of a digital telephone in the switching system of Fig. 3. FIG. Explanation of symbols, 1, 2...Subscriber line terminal, 3,
3', 3''...Contacts of the loudspeaker switch (lock type), 4,4'...Contacts of the hook switch, 5...
Diode bridge, 6...Power separation circuit, 7...
...Digital telephone circuit, 8...Power supply circuit, 9...
...dial, 10...telephone, 11...telephone receiver,
12... Speaker for loudspeaker reception, 13... Receiving channel, 14... Transmitting channel, 21... Standby state, 2
2... Handset talking state with the loudspeaker switch not pressed, 23... Loudspeaker receiving state, 24... Handset talking state with the loudspeaker switch pressed, 31... Switch control circuit, 32 ...Electronic switch, 33,3
3'...Contact point of loudspeaker switch (non-lock type), 34...AND gate, 35...Inverter,
36...D flip-flop, 37,40...
OR gate, 38, 39... Power-on reset circuit, 41, 42... Time constant circuit, 43, 44,
45, 46...Electronic changeover switch, 51...Standby state, 52...Handset talking state, 53...
On-hook loudspeaker reception state, 54 . . . off-hook loudspeaker reception state.

Claims (1)

[Scope of Claims] 1. A telephone equipped with a switch that is turned on when the handset is off-hook and turned off when the handset is on-hook, comprising: a loudspeaker for receiving a loudspeaker; a first switch for switching the speaker on and off;
In addition to being equipped with a second switch for switching the handset on and off, a third switch consisting of an electronic switch for opening and closing the subscriber line loop, and a non-locking loudspeaker answering switch, (a ) In the standby state in which the first to third switches are off, the off-hook of the handset causes the first switch to be off and the second and third switches to be off.
(b) In the standby state, by pressing the first switch on the non-locking loudspeaker switch, the first switch and the second switch are switched on. The system shifts to the on-hook loudspeaker receiving state in which the switch No. 3 is on and the second switch is off, and then pressing the second non-locking loudspeaker switch returns to the original standby state. (c) In the on-hook loudspeaker receiving state, (d) In the handset talking state, by pressing the first non-lock loudspeaker switch, the first switch and the third switch are turned on and the second switch is turned on.
The handset enters the off-hook loudspeaker receiving state in which the switch is off, and then pressing the second non-lock loudspeaker switch returns to the original handset speaking state. a switch control circuit composed of logic circuits that controls the opening and closing of the first to third switches by using as input signals the on/off operation of the switch and the signal generated by pressing the non-lock loudspeaker switch; and a time constant circuit for preventing the loudspeaker and the transmitter from being simultaneously connected to the telephone circuit during transition between the handset talking state and the off-hook loudspeaker receiving state.