JPS6128230A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To simplify the switch operation by the user by providing a voice switching device connecting a signal of the 1st hybrid terminal to a speaker terminal based on a voice signal from the 1st hybrid terminal and connecting a signal of a microphone terminal to the 2nd hybrid terminal based on a voice signal from a microphone. CONSTITUTION:When a voice signal is inputted from a telephone line 9 to a hybrid circuit 15, an output of a voice signal detecting circuit 23 goes to H level and an analog switch 29 is turned on. Thus, the voice signal is inputted to an audio amplifier 16 via an analog switch 28, a resistor 27, the analog switch 29 and relay contacts 33a, 34a, amplified and outputted from a speaker 8. When the voice signal is inputted from a microphone 7, since an output of voice signal detecting circuits 21, 22 changes respectively to H and L level, analog switches 30, 31 are turned on, the voice signal is inputted to the hybrid circuit 15 via a resistor 20, a relay contact 33b, analog switches 30, 31 and an amplifier 35 and given to a telephone line 9.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cordless telephone having multiple functions consisting of a base unit connected to a telephone line and a slave unit wirelessly connected to the base unit. This invention relates to a switching mechanism for each function of the above-mentioned telephone.

[Prior art]

Conventionally, the above-mentioned cordless telephones have been equipped with basic wireless phone functions using a handset, a public address telephone function (speakerphone function) using a base unit, a transfer function to switch the telephone line from one of the base units to the other, and a base unit with a transfer function to switch the telephone line from one of the base units to the other. Some devices are known that have an intercom function between telephone lines and a hold function that temporarily puts the telephone line on hold. To switch between the above functions, conventional devices employ a configuration in which a user selects and operates each switch according to each function by combining multiple push button switches or slide switches provided on the base unit. Ta.

FIGS. 1(a) and 1(b) are external views showing a conventional base machine of the above-mentioned cordless stuffing machine. Figure (a),
In (b), 1 is a call switch, 2 is a speaker bomb switch, 3 is an ink cam switch, 4 is a hold switch, and 5 is a mute switch, each of which is a push button switch. Reference numeral 6 in Figure (b) is a slide switch having switching functions from the left to ink cam, in-course, and hold. Further, 7 is a microphone, 8 is a speaker, and 9 is a telephone line. Note that 10 is a lamp indicating each state of the device, including a charge lamp 10a, a hold lamp 10b, an in-course lamp 10C, and an ink cam lamp.
d, a power lamp 10e, etc. are provided.

Next, switching operations for each function will be explained using the conventional example shown in FIG. When you receive a call from telephone line 9,
When an incoming call rings at the same time as the base unit and the handset (not shown), the speaker phone switch 2 is turned on when the base unit receives the call. Then, the microphone 7 and speaker 8 provided on the base unit
allows hands-free calling (speakerphone function)
. When transferring the above-mentioned call to the handset, first the telephone line 9 is put on hold by the hold switch 4 (hold function). Next, the speaker phone switch 2 is turned off, and the call switch 1 is turned on to call the handset.

If there is a response from the handset, turn on the ink cam switch 3 and talk to the handset (intercom function). When the handset answers a call, turn off the intercom switch 3 and then turn off the hold switch 4 to establish a call between the handset and the telephone line 9, and the call is transferred from the base to the handset. (transfer function and basic function).

As described above, the conventional device is configured so that a circuit changeover switch corresponding to each function is provided, and the user selects and operates the -1 switch according to each function, so it is relatively easy to operate. Although it has the advantage of being able to configure a switching mechanism, it has the disadvantage that the switch operation becomes extremely complicated for the user.

[Summary of the invention]

The present invention includes a receiving circuit, a transmitting circuit, a speaker, a hybrid circuit connected to a telephone line, a microphone, a first switching means, a receiving circuit connected to the hybrid circuit in a first switching state, and a hybrid circuit. connect to the transmitting circuit,
a second switching means that interrupts the reconnection state in a second switching state and connects a microphone and a speaker to the microphone terminal and the speaker terminal of the first switching means, respectively; a setting section including a switch for setting either one of the second switching states, and the first switching means is the first switching state to which the output side and the input side of the hybrid circuit are connected.
and a second hybrid terminal, and audio in which the signal of the first hybrid terminal is connected to the speaker terminal based on the audio signal from the first hybrid terminal, and the signal of the microphone terminal is connected to the second hybrid terminal based on the audio signal from the microphone. By providing a switch, the above-mentioned drawbacks are eliminated, and will be explained in detail below using examples.

[Embodiments of the invention]

FIG. 2 is a block diagram showing a base unit of an embodiment of the cordless telephone according to the present invention, and the same or equivalent parts as in FIG. 1 are given the same reference numerals. In the figure, 11 is a receiving circuit that demodulates the signal from the handset received via antenna I2 into an audio signal, 13 is a transmitting circuit that modulates the audio signal and transmits it from antenna 14 to the handset, 1
5 is a hybrid circuit connected to the telephone line 9, and 16 is an audio amplifier that drives the speaker 8. on the other hand,
17 is a first switching means, which is an amplifier 18 for the audio signal input from the microphone 7; Bandpass filter 19. Resistor 20 for taking out the audio signal. and an audio signal detection circuit 21 that outputs an H level when the audio signal is input; an amplifier 22 for audio signals that is input from the telephone line 9 via the hybrid circuit 15; It consists of an audio signal detection circuit 23 that outputs , and an audio switching device 24 that operates depending on the output level of each of the audio signal detection circuits 21 and 23. Note that the audio switching device 24 is a NAN whose input is the output of the audio signal detection circuit 23.
D circuit 25, the output of the audio signal detection circuit 21 and the above N
A NAND circuit 26 inputting the output of the AND circuit 25, an analog switch 28 and 29 inserted in series between the first hybrid terminal 8 of the first switching means 17 and the speaker terminal 8 via a resistor 27, and a microphone. It consists of an analog switch 30, 31 inserted in series between the terminal E and the second hybrid terminal E. Each of the analog switches 28 to 31 has a control input terminal C, and is turned on by an H level input from the audio signal detection circuit 21, 23 or the NAND circuits 25 and 26. 3
Reference numeral 2 denotes second switching means, each including a pair of two-contact type relay contacts 33a.

Relay switch 33 having 33b and 34a, 34b
．． 34, the receiving circuit 11 is connected to the hybrid circuit 15 via the amplifier 35 in the first switching state in which it is switched to a normally closed contact as shown in the figure, and the hybrid circuit 1
5 is connected to the transmitting circuit 13 via the resistor 36, and the microphone 7 and the speaker 8 are connected to the microphone terminal and the speaker terminal B of the first switching means, respectively, in the second switching state where the contact is switched to a normally open contact. It is configured as follows.

Reference numeral 37 denotes a setting section for setting the switching state of the second switching means 32, which is connected to the microcomputer 38 and the input port 39. Intercom switch 4o and also output capo-1-01.

02 via resistors 41.42 and the switching transistor 43.44 are turned on, the relay 33A operates to switch the relay switch 33.34 from a normally closed contact to a normally open contact. , 34A. Furthermore, the intercom switch 40 is connected to the microcomputer 38.
Based on the operation, a handset calling signal is output to the transmitting circuit 13, and a response signal to the calling signal or a base calling signal from the handset is inputted from the receiving circuit 11.

Next, the operation of this embodiment configured as above will be explained according to each function. First, as a basic function, when the handset is using the telephone line 9, the answer switch 39
．． 40 etc. to intercom switch Z is not operated at all, so microcomputer 3
Output ports 02 and 01 of 8 become L level and relay 33
A and 34A are both turned off, and both relay switches 33 and 34 are connected to the normally closed contact side and are in the first switching state. In this state, a signal is sent from the handset and the receiving circuit 1
The audio signal demodulated in step 1 passes from relay contact 33a to relay contact 34a, and is then sent to amplifier 35. Hybrid circuit 15
to the telephone line 9 via. On the other hand, the audio signal from the telephone line 9 is input from the hybrid circuit 15 to the transmission circuit 13 via the 36° resistor relay contact 34b, modulated, and transmitted to the handset. Note that the relay contact 34a is connected to the analog switch 31.30 via the second hybrid terminal E.
The hybrid circuit 15 is also connected to the analog switches 28 and 29 via the first hybrid terminal A, but since both are cut off by the relay contacts 33a and 33b, the analog switches 28 to 31 are No audio signal will flow through this path regardless of the state.

Next, the speakerphone function will be explained. When an external call is received via the telephone line 9, a buzzer (not shown) built into the base unit sounds and a signal indicating the incoming call is sent to the slave unit. At this time, when the answer switch 39 is pressed on the main unit side, an L level signal is input to the input port II of the microcomputer 38, output ports 01 and 02 become H level, and both transistors 43 and 44 are turned on. Become. Therefore, the relays 33A and 34A operate, and the relay switches 33 and 34 are both switched to the normally open contact side, resulting in the second switching state. In this state, microphone 7 and telephone line 9
The outputs of the audio signal detection circuits 21 and 23 are at the L level and the analog switch 28 is on until the audio signal from the audio signal is input.

29 is off, 30 is off, and 31 is on. When an audio signal is input from the telephone line 9 to the hybrid circuit 15, the output of the audio signal detection circuit 23 becomes I (level) because the analog switch 28 is in the on state.
Analog switch 29 is turned on. Therefore, the audio signal is transferred from the analog switch 28 to the resistor 27. The signal is input to the audio amplifier 16 via the analog switch 29 degree relay contacts 33a and 34a, is amplified, and is emitted from the speaker 8. At this time, even if an audio signal is input from the microphone 7, the output of the NAND circuit 25 is at L level, and therefore the analog switch 31 is off.
The voice signal does not flow to the telephone line 9. Next, when the audio signal is no longer input from the telephone line 9 and the audio signal is input from the microphone 7, the outputs of the audio signal detection circuits 21 and 22 change to H level and I level, respectively, so the analog switch 30 .31 is turned on, and the audio signal is passed through the resistor 20.31. Relay contact 33b, analog switches 30 and 31. The signal is input to the hybrid circuit 5 via the amplifier 35 and flows to the telephone line 9.

At this time, even if an audio signal is input from the telephone line 9, the output of the NAND circuit 26 is at L level, and therefore the analog switch 2B is off, so the audio signal does not flow to the speaker 8. In this way, two-way communication is not formed during the speakerphone function. This speakerphone function is activated by pressing the answer switch 39 again, which causes the output port 01.02 of the microcomputer 38 to go to the L level, turning off the relays 33A and 34A, and turning both the relay switches 33 and 34 to the first It ends by restoring the switching state (basic function).

Next, the transfer function will be explained together with the intercom function and the hold function. In order to transfer a call between the base unit and the outside to the slave unit during the speakerphone function, the intercom switch 40 is first pressed. When the intercom switch 40 is pressed, the microcomputer 3 outputs a handset calling signal to the transmitting circuit 13, waits for a response signal from the handset to be input via the receiving circuit 11, and then outputs a call signal to the output port 0.
1 is set to L level, and relay 33A is turned off.

That is, only the relay 34A is turned on, the relay switch 33 is in the first switching state, and the relay switch 34 is in the second switching state. In this state, the signal path is the same as when the intercom function is used, but the audio signal from the telephone line 9 is cut off from both the transmitting circuit 13 and the speaker 8 by the relay contacts 34b and 33a, and is put on hold (
hold function). Note that when using the intercom function alone, by pressing the intercom switch 40, the microcomputer turns on only the relay 34A after waiting for the response signal from the handset to be input as described above. During each of the intercom functions described above, the audio signal from the main unit is input from the microphone 7, and the audio signal is input from the amplifier 18.
Bandpass filter 19, resistor 20. It is input to the transmitting circuit 13 via the relay contact 33b and the relay contact 34b, is modulated, and transmitted to the handset, and the audio signal from the handset is demodulated by the receiving circuit 11, and then sent to the relay contact 33a and the relay contact 34.
The signal is inputted to the audio amplifier 16 via a, amplified, and emitted from the output 8.

After shifting from the speakerphone function to the intercom function in this way, by pressing the intercom switch 40 again on the base unit side, the relay 34A is turned off, and both the relay switches 33 and 34 are in the first switching state, and the intercom function is disabled. finish.

However, at this time, the handset is still in the transmitting state and the telephone line 9 is on hold, so the relay switches 33 and 34 are both in the first switching state, and the basic function is the same as described above. , a communication network between the handset and the telephone line 9 is formed.

As described above, the call has been transferred from the base unit to the slave unit via the telephone line 9. Furthermore, in order to transfer from this state to the base unit, a base unit call signal is transmitted from the slave unit side. When the base unit receives the above signal, a buzzer sounds and the answer switch 39 is pressed. The microcomputer 38 inputs and receives the calling signal (12).
Based on the level input, the output port 02 is set to H level and only the relay 34A is turned on, so that the intercom function is activated as described above. Thereafter, when the handset turns off the transmission, the relay 34A is turned off and both the relay switches 33 and 34 are in the first switching state, but the telephone line 9 remains connected, so it is in the hold state. In this state, when the base unit presses the answer switch 39, the speakerphone function is activated again, and the transfer from the seventh unit to the base unit is performed.

〔Effect of the invention〕

As explained above, the cordless telephone according to the present invention includes a receiving circuit, a transmitting circuit, a speaker, a hybrid circuit connected to a telephone line, a microphone, a first switching means, and a first switching means. In the switching state, the receiving circuit is connected to the hybrid circuit, and the hybrid circuit is connected to the transmitting circuit, and in the second switching state, both connection states are cut off, and the microphone and speaker are respectively connected to the microphone terminal of the first switching means. , a second switching means connected to the speaker terminal;
The switching means is the same as the above-mentioned No. 1. a setting section including a switch for setting either one of the second switching states, and the first switching means has first and second hybrid terminals to which the output side and the input side of the hybrid circuit are connected; Equipped with an audio switch that connects the signal from the first hybrid terminal to the speaker terminal based on the audio signal from the terminal, and connects the signal from the microphone terminal to the second hybrid terminal based on the audio signal from the microphone, so each function can be adjusted separately. Since all functions can be switched with a small number of switches without providing a switch, the switching operation becomes easy.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are external views showing a base unit of a conventional cordless telephone, and FIG. 2 is a block diagram showing a base unit of an embodiment of a cordless telephone according to the present invention. 7... Microphone, 8... Speaker, 11... Receiving circuit, ]3... Transmitting circuit, 15... Hybrid circuit, 17... First switching means, 24... Audio switching device ,3
2... Second switching means, 38... Setting section, 39...
Answer switch, 40...intercom switch,
A...First hybrid terminal, B...Speaker terminal, D...Microphone terminal, E...Second hybrid terminal. In addition, in the figures, the same reference numerals are used for the same or corresponding parts.

Claims (1)

[Claims] a receiving circuit, a transmitting circuit, a speaker, a hybrid circuit connected to a telephone line, a microphone, a first switching means, the receiving circuit is connected to the hybrid circuit in the first switching state, and the hybrid circuit is connected to the transmitting circuit. a second switching means that connects the second switching means to the microphone terminal and the speaker terminal of the first switching means, interrupts both the connection states in the second switching state, and connects the microphone and the speaker to the microphone terminal and the speaker terminal of the first switching means, respectively; 1, a setting unit including a switch for setting one of the second switching states, and the first switching means has first and second hybrid terminals to which the output side and the input side of the hybrid circuit are connected; It is characterized by comprising an audio switching device that connects the signal from the first hybrid terminal to the speaker terminal based on the audio signal from the hybrid terminal, and connects the signal from the microphone terminal to the second hybrid terminal based on the audio signal from the microphone. Cordless telephone.