JPS5915225B2 - remote communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote communication device useful for use in a remote communication device, particularly a telephone device having a cordless slave telephone connected wirelessly to a parent telephone as a parent device.

Consists of a parent device connected to a telephone line for general subscribers, and a portable cordless slave phone as a slave device that is wirelessly connected to the parent device. Devices for communicating with a large number of general subscriber telephones have been developed, and some of them are in practical use.

Since this type of parent-child telephone device is connected wirelessly as described above, it is necessary to identify the signal emitted by the slave telephone from among the radio waves arriving at the parent device. For this reason, in conventional devices, a tone oscillator having a frequency unique to the slave phone in the upper voice band is built into the slave phone, and when the slave phone is used to remotely control the parent device or When the device calls a slave phone and the slave phone responds to the call, a carrier wave oscillated from a transmitter built into the slave phone is modulated with a signal from the tone oscillator along with voice, and the tone signal is transmitted to the parent device. However, only when the identification circuit of the parent device identifies a tone signal specific to the child phone, the parent device and the child phone are coupled. By the way, in the conventional device as described above, a tone signal is generated while the parent device and the slave phone are connected wirelessly, and the carrier wave contains the voice and the tone signal.

Therefore, it is necessary to use a voice band low-pass filter and a tone signal high-pass filter or band-pass filter in the receiver system of the parent device, resulting in a very high cost. Furthermore, in order to improve the voice quality of a call, it is necessary to improve the cut-off characteristics of the voice band low-pass filter, which increases the cost. Furthermore, since voice signals and tone signals are simultaneously input as modulated signals on the child telephone side, considerable consideration must be given to modulation level distribution and modulation method in order to stabilize the degree of modulation and the wireless connection between parent and child. In addition, since the slave phone must constantly receive signals from the parent device, voltage must be applied to the entire slave phone at all times, which leads to rapid battery consumption and is extremely uneconomical. An object of the present invention is to provide a remote communication device comprising a parent device connected to a general subscriber telephone and a portable slave telephone wirelessly coupled to the parent device, at least during a call between the two parties.
It is an object of the present invention to provide a remote communication device that does not include a tone signal for identification in a carrier wave that combines the two. Next, embodiments of the present invention will be described in detail using the drawings.
FIG. 1 is a block diagram of a parent device connected to a general subscriber telephone line.

In the figure, terminals AC and B are connected to a telephone line connected to an exchange. Reference numeral 2 denotes an ordinary landline telephone set, which is connected to terminals A and B through a connector 3.

Reference numeral 10 denotes a reception block, which is always energized and ready for reception.

The receiving block 10 is equipped with two audio output terminals a, a tone output terminal b, and a meter output terminal c. Note that the meter output terminal c becomes high level when the reception block 10 receives the high frequency signal sent from the slave telephone.
Reference numeral 11 denotes a tone decoder circuit, which is always energized, and its output terminal 5 is normally at a high level, but becomes a low level when a signal arrives from the tone output terminal b of the receiving block.

A transmitting circuit 16 has a microphone input terminal e, and is supplied with power from the power switch circuit 100 as necessary to perform transmission.

Reference numeral 145 denotes an audio amplifier that operates only when power is supplied to the transmitting circuit 16, and the audio output terminal a of the receiving block 10 is connected to the input terminal, and the audio amplifier 145 outputs the amplified audio signal to the transformer T1.

Inverters 27 and 102 are connected to both four input terminals of the latch circuit 29, respectively.

101 is an inverter for transmitting the output of the tone decoder circuit 11 to the gate 18.

Gate 18 receives the outputs of inverter 101 and latch circuit 29, outputs a required signal, and controls relay 5. The opening/closing part 5-1 of the relay 5 is inserted between the terminal A and the transformer T1, and is of a normally off type. 6 is a neon lamp inserted in parallel with the opening/closing part 5-1, and is coupled to the light receiving element 33 in the power switch circuit 100, and when the opening/closing part 5-1 is open, terminals A and B are connected.
When a calling signal arrives from the terminal, this signal is passed through a capacitor 7 to light up a neon lamp 6 to display a call on the parent device, and also to expose the light receiving element 33 to perform a calling operation for the slave phone, which will be described later.

In FIG. 1, 4 is a manual transmission switch, 9 is a battery for power supply, 13 is a light emitting element for transmission display, and 103 is a time constant circuit. FIG. 2 is a block diagram of a slave telephone used in combination with the parent device shown in FIG.

In FIG. 2, 46 is a power supply battery, and 41 is a receiving circuit, to which power is intermittently supplied from the power supply battery 46 by a current consumption reduction circuit 53. 52 is a call control circuit;
Power is constantly supplied from a battery 46 for power supply.

Then, a predetermined signal is output using the DC output of the receiving circuit 41 and the power signal via the switch 55, and the current consumption reduction circuit 53 and the buzzer control circuit 47 are controlled. The buzzer control circuit 47 receives a signal from the call control circuit 52, operates only when the switch 55 is open and the DC output terminal f of the reception circuit 41 becomes high level, and outputs a signal through the audio amplifier 50. The speaker 42a in the handset 42 is driven to perform a calling operation. The switch 55 closes when the handset 42 is lifted up, and when the switch 55 is closed, the transmitting circuit 4
3. Supply power and signals to the tone oscillator 44, control circuit 51, and call control circuit 52. The tone oscillator 44 has a tone oscillator that oscillates at a predetermined frequency that identifies the slave phone, and the oscillation frequency of the tone oscillator is a value outside the voice band, that is, from 4000 Hz to 4000 Hz.
This is one wave within the range of 10,000 Hz. Note that the tone oscillator 44 performs an oscillating operation only when the handset 42 is lifted and the hook switch 55 is closed, and supplies its output to the control circuit 51. The control circuit 51 is controlled by the closed signal of the switch 55 and the signal of the dial mechanism 42c in the handset 42,
A signal from the tone oscillator 44 is inputted to the tone-in terminal g of the transmitting circuit 43 as required. Reference numeral 54 denotes a voltage reduction warning circuit that lights up the light emitting element 56 to issue a voltage reduction warning when the terminal voltage of the power supply battery 46 drops.

Next, the operation of the above embodiment will be explained.

In the standby state, no signal appears at any of the three terminals of the receiving block 10 in the parent device shown in FIG. 1, audio output terminal a, tone output terminal b, and meter output terminal c, and the output from the audio output terminal Zero, tone output terminal b
is at low level, and meter output terminal c is at low level.

Therefore, since the tone decoder circuit 11 is unmanned, its output terminal d becomes high level, and the latch circuit 29
The output terminal F of is held at high level, and the gate 1
The output of No. 8 is low level. Therefore, the relay 5 is in an unenergized state, its opening/closing portion 5-1 is open, and it is in a state where it can be held from the telephone line side connected to the terminals A and B. Further, the power switch circuit 100 is in an off state, and power is not supplied to the audio amplifier 14 and the transmitting circuit 16. On the other hand, the handset 42 on the slave telephone side shown in FIG. Power is supplied from the power consumption reduction circuit 53, no DC output signal is output from the DC output terminal f, and the call control circuit 52
Since no signal is output from the buzzer control circuit 4.
7 is not working either.

Further, power is not supplied to the tone oscillator 44 and the control circuit 51, and they are in an inactive state. When calling the parent device from the child telephone side to conduct a conversation between the child and the parent, or when connecting the child phone to a telephone line via the parent device, first lift the handset 42 of the child telephone. As a result, the switch 55 is closed, power is supplied to the control circuit 51, the tone oscillator 44, the calling control circuit 52, and the transmission circuit 43, and the transmission circuit 43 emits a transmission radio wave. At the same time, the tone oscillator 44 oscillates at a predetermined tone frequency, and the control circuit 51 allows the tone signal to pass for a certain period of time after the switch 55 is closed, and sends the signal j to the tone-in terminal g of the transmitting circuit 43.

According to the operation so far, after the handset 42 is lifted, high-frequency radio waves modulated at a tone frequency are emitted from the antenna of the slave phone for a certain period of time, and after a certain period of time, if there is no other operation, unmodulated high-frequency radio waves are emitted. continue to emit radiation.

The high-frequency radio waves that have been modulated for a certain period of time immediately after the switch 55 is closed will be referred to as "tone identification radio waves." At the same time, the call control circuit 5
The power signal supplied to the circuit 2 stops the call standby operation of the circuit 52, and the circuit 52 supplies an output to the current consumption reduction circuit 53 to stop its intermittent standby operation, and the receiving circuit 41 and the audio amplifier 50. Continuously supply power to the buzzer control circuit 47. Such a state is called a "talking state." On the other hand, the parent device receives the "tone identification radio wave" emitted from the slave phone, and if the carrier frequency is within the receiving frequency range of the receiving block 10, a signal is sent to the meter output terminal c of the receiving block 10. is generated (changes from low level to high level) and is supplied to the inverter 27 to enable the latch circuit 29 to be set.

In addition, the reception block 10 detects the "tone identification radio wave" sent from the slave phone and detects a value of 400, which is outside the voice band.
A single wave signal within the range of 0z to 10000Hz is obtained, generated as a tone signal at the tone output terminal b, and supplied to the tone decoder 11. If this tone signal differs from the preset frequency specific to the child telephone, the output of the tone decoder 11 will not change at all. Further, if this tone signal has a frequency specific to the child telephone, the output terminal d, which was at a high level during standby, is set to a low level for a certain period of time during which the tone signal continues. This signal is transmitted to inverters 101 and 102.
The output of the inverter 101 remains at a high level while receiving the tone signal. The output of the inverter 102 is inputted through the time constant circuit 103, and the output of the inverter 102 was at a low level during standby, but after the output of the tone decoder circuit 11 became low level, the output of the inverter 102
It becomes a high level later than the output of the tone decoder circuit 11 becomes a high level, but earlier than the duration of the tone signal, and immediately falls to a low level when the output of the tone decoder circuit 11 becomes a high level again. Furthermore, depending on this timing operation,
Relay 5 is designed not to operate with a tone signal,
The opening/closing portion 5-1 remains open. Now, in response to the output of the inverter 102 and the output of the inverter 27 mentioned above, the output terminal F of the latch circuit 29 becomes low level, and the latch circuit 29 enters the set state.

The output of the gate 18 is at a low level during the standby period,
While the tone signal is being received, it continues to be at a low level, but the low level signal at the output terminal F of the latch circuit 29 and the inverter 1
Upon receiving the low level signal at the output terminal C of the inverter 101, the tone signal ends.6, the output terminal C of the inverter 101 becomes low level and the output of the gate 18 becomes high level. Then, when the output of gate 18 becomes high level, relay 5
operates and closes the opening/closing portion 5-1. On the other hand, when the output terminal F of the latch circuit 29 becomes low level, the power switch circuit 100 is turned on and supplies power to the transmission display light emitting element 13, the transmission circuit 16, and the audio amplifier 14. As a result, the audio signal from the slave phone is transmitted to the terminals A and B, and the signals from the terminals A and B are also input from the transformer T2 to the microphone input terminal e of the transmitting circuit 16 and modulated by the transmitting circuit 16. It is in a state where it is transmitted to the mobile device side. If the handset of the fixed telephone 2 is lifted in this state, mutual communication is possible between the parent device and the slave telephone. Next, in the talking state after the end of the tone signal, without a mutual conversation, when the slave phone side operates the dial mechanism 42c provided in the handset 42, the control circuit 5
1, a pulse corresponding to the dialed number is input, and at a timing corresponding to the number of pulses, a tone signal from the tone oscillator 44 passes through the control circuit 51 and is input to the tone-in terminal g of the transmitting circuit 43. Ru.

This signal is called a "dial pulse signal." And this
The signal No. 5 is modulated and radiated from the transmitting circuit. This is called a "dial pulse radio wave." This dial pulse radio wave is received by the receiving block 10 of the parent device, and when the same conditions as the tone signal are met, an output appears in the tone decoder circuit 11, dialing is performed on the slave phone at t, and the tone signal arrives. When there is no tone signal, the output of the tone decoder circuit 11 becomes low level, the output of the gate circuit 18 becomes high level, the relay 5 is energized, and its opening/closing part 5-1 is turned on, and when there is no tone signal, the tone decoder circuit 11 The output of the gate circuit 18 becomes a high level, the output of the gate circuit 18 becomes a low level, the relay 5 is deenergized, the opening/closing part 5-1 is turned off, and the dialing operation is the same as that of a normal telephone line. You can call other telephones dialed through the central office exchange and make calls just like a normal telephone. When the call is completed, the handset 4 of the slave phone
2 on the hook switch 55 and open it,
The slave phone side returns to the standby state, and the transmitting circuit 4
3 also stops transmission.

On the parent device side, when the carrier wave sent from the slave phone side stops, the meter output terminal c of the receiving block 10 becomes low level, the output of the inverter 27 becomes high level, and the output of the latch circuit 29 Since the terminal F becomes a high level and the relay 5 is turned off, its opening/closing part 5-1
is opened, and the parent device is disconnected from the telephone line.

At the same time, the switching transistor of the power switch circuit 100 is also turned off, and the power supply to each part is stopped, so the transmission display light emitting element 13 is also turned off, and the audio amplifier 14 and transmission circuit 16 are also inoperable. Return to standby state as described above. Next, in the standby state, when a calling signal is input from the telephone line of terminals A and B, this signal passes through the capacitor 7 and lights up the neon lamp 6. The resistance value of the other device is decreased and the power switch circuit 100 is turned on, power is supplied to the audio amplifier 14 and the transmitting circuit 16, and the transmitting display light emitting element 13 is turned on.

The slave phone in standby mode receives the carrier wave sent from the parent device, and if this radio wave is within the receiving frequency range of the receiver circuit 41 of the slave phone, a high level signal is sent to the DC output terminal f of the receiver circuit 41. A signal is generated, the call control circuit 52 is driven, the intermittent operation of the current consumption reduction circuit 53 is stopped, and a call signal is generated from the speaker 42a of the handset 42 through the buzzer control circuit 47 and the audio amplifier 50.

At this point, lift the handset 42 and press the switch 55.
When closed, the output of the call control circuit 52 is prohibited and the call signal is stopped. Then, by lifting the handset 42 and turning on the switch 55, the same operation as the above-described calling operation from the child telephone side is repeated, and the connection with the parent device is established. In this case, if the tone frequencies are different, no connection will be made with the parent device and no erroneous connection will occur. When the parent device manually calls the slave phone, the manual transmission switch 4 of the power switch circuit 100 is turned on.

This operation turns on the power switch circuit 100,
The child telephone can be called by the same operation as the above-mentioned calling from an outside line, and a conversation can be made by connecting to the slave telephone. Note that FIG. 3 shows waveforms during operation of each part of the parent device in the above embodiment. As described in detail above, the present invention allows a parent device to distinguish between its own slave phone and other slave phones using an identification tone signal of only one frequency, and in this identification, the parent device and the slave A mutual communication path between the telephones is established for a certain period of time, and during this time the parent device can sufficiently confirm whether or not it is a slave telephone, so that the connection between them is reliably established.

In addition, tone signals are generated only for a certain period of time at the start of a call on the slave phone and during dialing, and the tone signal is not superimposed on the carrier wave during the call period.
In addition to improving the /N ratio compared to conventional systems, the tone signal sent from the child phone does not activate the relay inserted into the phone line of the parent device, so the power of the parent device is reduced. While checking the child phone,
No noise is sent onto the telephone line. Moreover, the sound quality during a call can also be improved. Moreover, it is no longer necessary to use tone signal filters and audio filters in the audio circuit in the receiving block of the parent device.
Assembling and adjusting the audio circuit of a wireless parent-child telephone device becomes easier, and the cost can be lower than that of conventional devices. Furthermore, since the slave phone is provided with a current consumption reduction circuit, the power consumption of the slave phone can be significantly reduced compared to conventional systems. Furthermore, since the start of communication with the slave phone and the start of relay operation do not overlap,
Communication with the slave telephone can be ensured, and the slave telephone can promptly respond to communications.

The present invention can be used not only as a cordless parent-child telephone device, but also as a remote control device for equipment that requires selecting a specific partner station or device and inputting a signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the parent device, FIG. 2 is a block diagram of the slave telephone, and FIG. 3 is a waveform diagram showing waveforms of various parts of the parent device. In the figure, A and B are terminals, 2 is a landline telephone, 3 is a connector,
4 is a manual transmission switch, 5 is a relay, 6 is a neon lamp, 9 is a battery for power supply, 10 is a reception block, 11 is a tone decoder circuit, 13 is a light emitting element for transmission display, 14 is an audio amplifier, 16 is a transmission circuit, 18 is the gate, 27,
101, 102 are inverters, 29 is a latch circuit, 10
3 is a time constant circuit, 41 is a receiving circuit, 42 is a transmitter/receiver, 4
3 is a transmitting circuit, 44 is a tone oscillator, 46 is a battery for power supply, 47 is a buzzer control circuit, 50 is an audio amplifier, 51 is a control circuit, 52 is a calling control circuit, 5
3 is a current consumption reduction circuit, 54 is a low voltage warning circuit, 55 is a switch, and 56 is a light emitting element.

Claims (1)

[Claims] 1 Having a parent device and a slave phone installed remotely, the parent device receives an identification signal emitted by the slave phone, confirms its own slave phone using the identification signal, and establishes a link between the parent device and the slave phone. In the remote communication device that starts communication, the child phone uses a carrier wave with a frequency outside the voice band as a carrier wave used for communication with the parent device, and transmits a signal to the parent device that transmits for a certain period of time after the hook switch is turned on. The parent device includes a device that includes, as a modulated wave, a tone signal that identifies the dialed number, and a dial pulse signal that has the same frequency as the tone signal and is turned on and off in response to the number of pulses corresponding to the dialed number. comprises a tone decoder circuit for decoding the tone signal frequency, a detection means for detecting that the output of the tone decoder circuit has continued for a predetermined period of time, a transmitting circuit is operated at the time when the output of the detection means is generated, and the detection means The parent device is connected to the general subscriber telephone line after the output is generated and the tone signal ends, and the parent device and the general subscriber telephone line are disconnected according to the dial pulse signal, and the carrier wave is stopped. A remote communication device characterized in that it has a connection to a general subscriber telephone line and a circuit for stopping the operation of the transmission circuit.