JP3486237B2 - Communication equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device such as a telephone.

[0002]

2. Description of the Related Art When a telephone has only a handset communication function, the telephone is not connected to a commercial power source because the telephone is powered by a communication line. Calls can be made regardless of power failure of commercial power supply. However, in a telephone having many functions such as a telephone call with a handset and an answering machine function, a switching circuit for the function exists, and the power is obtained from a commercial power source to operate.

Therefore, when the commercial power supply is not supplied due to a power failure or the like (when it is deenergized), the switching circuit does not operate and all the functions of the telephone are disabled. However, since this is inconvenient, the applicant of the present application has previously filed a patent application for a telephone that can use the minimum required functions as a telephone when the commercial power supply is deenergized.

FIG. 3 shows the structure of the main part. In the figure, 61 and 62 are telephone lines. 63 is a speech network circuit, 64 is its reception output line, and 65 is a transmission input line. A switching IC 66 has a switch block 67. The switch block 67 has a switch circuit for connecting various types of externally attached circuits via the terminals of the switching IC 66 or for connecting those circuits to the lines 64, 65.

Reference numeral 68 is a handset, 69 is its speaker, and 70 is a microphone. The speaker 69 has a terminal T3
, And the microphone 70 is connected to the terminal T2.
On the other hand, the reception output line 6 of the speech network circuit 63
4 is connected to the terminal T1 and the transmission input line 65 is connected to the terminal T4. Reference numeral 71 is a detection circuit for detecting that the commercial power supply is deenergized, and is connected to the terminal T0 of the IC 66.
Other terminals of the IC 66 and other circuits connected to the IC 66 are not shown.

Since the detection signal is not given from the detection circuit 71 while the commercial power supply applied to the telephone is ON, there is no influence on the switching connection operation of the switch block 67, and the switch block 67 is not affected. Performs a predetermined switching operation. However, when the detection circuit 71 detects that the commercial power supply is deenergized, the switch block 67 connects the terminals T1 and T3 and connects the terminals T2 and T4.

Therefore, the received signal from the line is supplied to the speaker 69 of the handset 68 to drive the speaker, and the output of the microphone 70 of the handset 68 is output from the transmission line 6.
5 is sent to the telephone line via the speech network circuit 63. As described above, the conventional example shown in FIG. 3 is convenient because it can perform the minimum required functions (calls to the outside) as a telephone.

[0008]

However, since the minimum required functions may differ from one user to another, a telephone that can use only one uniform function as in the above-mentioned conventional example is not necessarily appropriate. It can't be said that it is.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication device in which a user can select a function that can be activated when the commercial power supply is deenergized.

[0010]

In order to achieve the above object, according to the present invention, a signal line for connecting a communication line and a plurality of signal lines of a plurality of circuits having a predetermined function is connected to operate a necessary one of the circuits. In a communication device having a switch block for switching and connecting lines, means for operating one of at least two circuits selected in advance when the commercial power supply is deactivated, and selection means for selectively setting the circuit to be operated. The configuration is provided.

The circuit that operates when the commercial power supply is deactivated operates by being connected to the communication line. Further, the communication line is a telephone line, and a circuit operable when the commercial power supply is turned off is a handset of a telephone , and
Beauty, I Oh in the receiving circuit and the microphone of the telephone main body, the quotient
When the power source for the
Of the specified phone handset or phone body
Receiving circuit and Ru are operated either microphone.

[0012]

According to such a configuration, it is possible to activate a function arbitrarily set by the selecting means among a plurality of functions of the communication device when the power is turned off. Moreover, you can select the function you want to work while the power is off.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 in which the present invention is implemented, reference numerals 1 and 2 are telephone lines. 3 is a speech net circuit, which is generally formed by an IC. 4 is a speech network circuit 3
The receiving output line 5 is a transmitting input line. A switching IC 6 has a switch block 7 built therein. The switch block 7 has a switch circuit for connecting various circuits connected to the terminals of the switching IC 6 and for connecting the circuits and the lines 4 and 5.

Reference numeral 8 is a handset, 9 is its speaker, and 10 is a microphone. The speaker 9 is connected to the terminal B1 and the microphone 10 is connected to the terminal A2. On the other hand, the reception output line 4 of the speech network circuit 3 is connected to the terminal A1.
The transmission input line 5 is connected to the terminal B2.

Reference numeral 11 is a speaker of the telephone body, and 12
Is also the main body microphone. The speaker 11 is connected to the terminal B3, and the microphone 12 is connected to the terminal A3. Reference numeral 13 is a detection circuit for detecting that the commercial power supply is deenergized. 14 enables the handset 8 when the power is turned off, or the speaker 11 and the microphone 12 on the main body side.
Is a selection means for selecting whether or not to operate, and its output is given to the switch block 7 through the terminal A0.

Now, in the telephone of FIG. 1, when the commercial power source is in the ON state, the switch block 7 performs a normal function switching operation of the telephone. However, when the commercial power supply is de-energized, the switch block performs a switching operation so as to operate the circuit set by the selection means 14.

For example, when the handset 8 is selected by the selecting means 14, the switch block 7 is activated when the power is turned off.
Connects terminals A1 and B1 and connects terminals A2 and B2. On the contrary, when the speaker 11 and the microphone 12 of the main body are selected, the terminals A1 and B3 are connected and the terminals A3 and B2 are connected.
Connect. In this way, the circuit (function) selected by the selection means 14 can work when the power is turned off.

Next, FIG. 2 shows a more specific embodiment. In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals. Reference numerals 15, 16, 17 are buffers on the input side, and reference numerals 18, 19, 40 are buffers on the output side. Reference numeral 20 denotes a switch, which connects (ON) a horizontal input line 21 and a vertical output line 22 and cuts off (OF).
F) In the figure, the switch 20 is indicated by a circle, but the other switches are also indicated by a circle. This ○
The switches 30 and 31 indicated by black circles are turned on.

These switches are composed of analog switches, and a switch control signal is applied to their control terminals. The output of the latch circuit 25 is applied to the control terminals of these switches. Although the latch circuit 25 and the circles are connected, they are not shown in the figure for simplicity. Data indicating which switch is turned on is input to the terminal 27, and this data is taken into the shift register 24 according to the clock input to the terminal 28.

The data is latched in the latch circuit 25 by the latch signal inputted through the terminal 29 and given to the switch. However, the switch is controlled by the output of the latch circuit 25 only when the commercial power supply is ON. The input terminals A4 to A8 and the output terminals B4 to B8 of the switching IC 6 are connected to circuits that perform other functions (calls with a handset, answering machine functions, etc.), but these circuits are not shown.

The commercial power source is converted to DC voltage in the telephone and V _DD
Has become. This V _DD is given to the bias circuit 26 and used as a bias power source in the IC 6. Transistor Q1 is on when V _DD is present,
When V _DD is deenergized, it turns off. Therefore, the transistors Q2 and Q3 connected to the line 4 are turned on.

Since the power source from the line 1 is applied to the line 4, the resistor R is connected to the power source. Further, one end of the switch SW is connected to the ground potential via the transistor Q3. Therefore, the switch SW as the selection means 14 becomes effective. Since both the transistors Q2 and Q3 are OFF when the power supply V _DD is ON,
The switch SW becomes invalid.

Now, when the switch SW is set to OFF, a high level is input to the IC 6 via the terminal A0 when the commercial power supply is deenergized, so that the switches 30 and 31 indicated by black circles are turned ON. Become. Therefore, terminals A1 and B1
Are connected, and the terminals A2 and B2 are connected. as a result,
When the commercial power supply is turned off, the handset 8 becomes operable and a call can be made through the lines 1 and 2.

When the switch SW is set to ON,
Since the low level is input to the IC 6 via A0 when the commercial power supply is deenergized, the switches 30 and 31 are turned off, while the switches 32 and 33 to which the high level is applied by the inverter 23 are turned on. Therefore, A1 and B3
And A3 and B2 are respectively connected, and the speaker 1 of the main body
1 and the microphone 12 become operable.

[0025]

As described above, according to the present invention, among the plurality of functions of the communication device, a function arbitrarily set by the selecting means can be activated when the power is turned off, and the desired function is selected. Because you can
It is convenient.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a main part of a telephone that implements the present invention.

FIG. 2 is a circuit diagram showing an embodiment embodying the invention.

FIG. 3 is a block diagram of a main part of a conventional telephone.

[Explanation of symbols]

1, 2 Telephone line 3 Speech network circuit 4 Receiving output line 5 Transmitting input line 6 Switching IC 7 Switch block 8 Handset 9 Handset speaker 10 Handset microphone 11 Phone body speaker 12 Phone body microphone 13 Power detection circuit 14 Selection Means SW selection switch 20, 30, 31, 32, 33 switch V _DD DC power source obtained from commercial power source

Claims (3)

(57) [Claims] 1. A communication device comprising a switch block for connecting signal lines of a plurality of circuits having a predetermined function to a communication line and switching and connecting the signal lines so as to operate a necessary one of the circuits. A communication device comprising means for operating one of at least two circuits selected in advance when the power is turned off, and selection means for selectively setting the circuit to be operated. 2. The communication device according to claim 1, wherein the circuit that operates when the commercial power supply is deactivated operates by being connected to the communication line. Wherein said communication line is a telephone line, the utility power is operable circuit when de-energized and the handset of the telephone, met Oh in receiving circuit and the microphone of the telephone body
When the commercial power supply is turned off,
Handset of the telephone set as desired, or telephone
The communication device according to claim 1 or 2, wherein one of the reception circuit and the microphone of the main body is operated .