JPS5829014B2 - mobile telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mobile telephone device comprising a mobile telephone equipped with a transmitter and a receiver, and a base station equipped with the transmitter and receiver and connected to a communication line. , relates to a so-called cordless telephone device.

Conventionally, in the case of this type of mobile telephone device, malfunctions such as calls to other base stations by other telephones have been prevented by changing the frequency of each device.

However, as such mobile telephone devices become more widespread in the future, malfunctions such as those described above may occur due to the fact that their frequency bands are not very wide and that many telephone devices are used in relatively close locations. It is easily expected that this will occur frequently.

The present invention was made in order to prevent such malfunctions.The mobile phone is equipped with a specific pulse code generation mechanism, modulated by the pulse code and transmitted, and the pulse code is transmitted to the base station. The system is equipped with a decoding mechanism to determine that it is a specific pulse code and close the dialing signal demodulation circuit.

1 and 2 show the basic configuration of the present invention, with FIG. 1 being a schematic block diagram of a mobile telephone, and FIG. 2 being a schematic block diagram of a base station.

In FIG. 1, 1 is a handset, 2 is an audio amplifier, 3 is a receiver, 4 is a transmitter, 5 is a low frequency oscillator, 6 is a dial, and 7 is a hook switch.

In FIG. 2, 8 is a receiver, 9 is a transmitter, 10 is an audio amplifier, and 11 is a telephone hybrid circuit, which is connected to a telephone line 12.

13 is a dialing relay connected to the telephone hybrid circuit; 14 is a dialing signal demodulation circuit.

In the above configuration, the present invention further connects to the low frequency oscillator 5 of the mobile telephone shown in FIG. It is equipped with a line connection holding signal generator 15 that applies modulation.

The base station shown in FIG. 2 also includes a line connection holder 16 that determines whether the pulse code from the receiver 8 is a specific one and closes the dialing signal demodulation circuit 14. There is.

The generation and subsequent transmission of the pulse code by the line connection holding signal generator 15 must occur before the generation and transmission of the dialing signal by the dial 6.

Therefore, the line connection holding signal generator 15 may be connected to the hook switch 7, or a suitable operation button or the like may be separately provided to determine the timing of the operation of the generator 15.

Further, this timing can be determined by the first operation of the dial 6, and various embodiments are possible.

In the mobile telephone device according to the present invention, after picking up the handset 1 and before operating the dial 6 to send a dialing signal, the line connection holding signal generator 15 operates to generate a pulse code. do.

The pulse code is input to a low frequency oscillator 5, where a tone signal modulated by the pulse code is oscillated,
Furthermore, the signal is transmitted by the transmitter 4 on a carrier wave.

The transmitted signal is received by a receiver 8 of the base station,
After detection and demodulation, the line connection holder 16 determines whether or not the pulse code is a specific pulse code.

If it is a specific pulse code, the dialing signal demodulation circuit 14 is closed and ready for the arrival of the next dialing signal.

Then, when the dial 6 is turned, the dialing signal is transmitted like the pulse code by the low frequency oscillator 5 and the transmitter 4, and after being received by the receiver 8 of the base station, it is already closed as described above. Dialing signal demodulation circuit 1
The signal is demodulated at 4, and the dialing relay 13 is driven 1 to connect the line.

Next, an embodiment of the present invention will be described based on FIGS. 3 and 4.

FIG. 3 is a block diagram of a mobile telephone of the mobile telephone device according to the present invention, and FIG. 4 is a block diagram of a base station.

First, the mobile telephone shown in FIG. 3 will be explained.

1 is a handset, 2 is an audio amplifier connected to this, and 3 is a receiver further connected to this, where the audio signal transmitted from the base station is demodulated by the receiver 3 and amplified by the audio amplifier 2. is input to the handset 1.

4 is a transmitter connected to the handset 1 and the hook switch 7, which is activated when the hook switch 7 is raised;
The audio signal from the handset 1 is sent out on a carrier wave.

6 is a dial, 5 is a low frequency oscillator connected to this, and the output side of this is connected to the transmitter 4.

When the dial 6 is turned, a dialing signal is output, and a tone signal modulated by this signal is output from the low frequency oscillator 5, and further transmitted by the transmitter 4 on a carrier wave.

Note that 25 is a low frequency detection circuit. In this embodiment, the line connection holding signal generator 15 is connected at its input side to the hook switch 7, and when the hook switch 7 is raised, the generator 15 is actuated.

This line connection holding signal generator 15 has a counter 20, a switch array 21, and pulse generators 22, 23.

The reset terminals (R, ST) of the counter 20 are connected to the hook switch 7 via the waveform shaping circuit 24, and when the hook switch 7 goes up, a reset pulse is output from the output ■ of the waveform shaping circuit 24, and the counter 20 is designed to be reset.

The counter 20 is a decimal counter, and its output terminals ■■■ and ■ are connected to AND circuits ANDI, AND2 . AN
D3. AND4. Connected to one input side of AND5.

The output terminal (2) is connected to the control input side of the pulse generator 22 via a NAND circuit NAND4.

The pulse generator 22 is a NAND circuit NAND1, NAND
2, an unstable multi-by-break consisting of NAND3, the output side of which is connected to the input terminal of the counter 20 (CL
K) and a switch array 21, which will be described later.

The pulse generator 23 includes a differentiating circuit and an inverter INVI.
, INV2, and the output side thereof is connected to the switch array 21.

The switch array 21 includes switches S1. S2,53S4
．． , S5, each of which has the pulse generator 2
2 and 23 can be selected.

In this embodiment, the pulse generator 22 generates a long mark pulse with a long pulse width, and the pulse generator 23 differentiates the long mark pulse and generates a short mark pulse with a short pulse width. The long mark corresponds to logic "1" and the short mark corresponds to logic +10", respectively.

Therefore, the switches Sl, S2, 5 of the switch array 21
By combining the connections of H.384 and S5, any digital code can be constructed.

The switches Sl, S2, 83. S4, 85 are AND circuits ANDI, AND2. AND3. AND4.
Connected to one input side of AND5.

AND circuit AND1, AND2. AND3, AND
4 and AND5 are connected to the low frequency oscillator 5 via an OR circuit OR1.

Note that the input terminal (CLK) of the counter 20 may be connected to the output side of the pulse generator 23 to count short mark pulses.

Next, the operation of this line connection holding signal generator 15 will be explained.

FIG. 3-a is this timing chart.

First, the handset 1 is picked up and the hook switch 7 is
When the value increases, a single pulse is output from the output side (2) of the waveform shaping circuit 24, and the counter 20 is reset.

When the counter 20 is reset, the output of the output terminal ■ becomes H.
'' changes to L'', the output of the NAND circuit NAND4 changes from L'' to 11H11, and the pulse generator 22 oscillates.

A long mark pulse is generated from the output side (3) of the pulse generator 22 and is input to the counter 20 and the switch array 21.

The counter 20 counts the pulses and its output terminal
Pulses are output from ■■.

When the output of the terminal ■ changes from lLj'' to '', the output of the NAND circuit NAND4 changes from 'ILI',
The oscillation of the pulse generator 22 stops.

On the other hand, short mark pulses are input to the switch array 21 from the output side 0 of the pulse generator 23 in addition to the long mark pulses.

In this example, switch S1. S2. S5 is a long mark, switch S3. S4 selects the short mark.

Therefore, as mentioned above, the long mark is logical! I III,
If the short mark is set to logic 11071, signals of 1, 1, 0, 0, 1 are output from the switches S1 to S5.

The signals are passed through AND circuits AND1, AND2, A
ND3. AND4. At AND5, the outputs are ANDed with the outputs from the respective terminals of the counter 20 and input to the low frequency oscillator 5 via the OR circuit ORI.

Therefore, the signal appearing on the output side [phase] of the OR circuit OR1 is a serial code of 1, 1, 0, 0, 1.

In this embodiment, the signal LSB from the AND circuit AND1
The signal from the AND circuit AND4 is taken as the MSB, and as a result, from 0, the binary code of "0011",
That is, a signal of 3'' in decimal notation is output.

Further, in this embodiment, this binary code is a BCD code.

Note that the signal from the AND circuit AND5 is used for latching, and this will be described later.

Further, in this embodiment, the pulse generator 22 is configured to output five pulses, but the configuration is not limited to this, and it is possible to output five or more pulses or five or less pulses, It goes without saying that the number of code combinations can be increased or decreased.

Next, the base station shown in FIG. 4 will be explained.

8 is a receiver, 10 is an audio amplifier connected to this, and 11 is a telephone hybrid circuit further connected to this, which is connected to a telephone line 12.

A voice signal transmitted from a mobile telephone is received and demodulated by a receiver 8, amplified by a voice amplifier 10, and then input to a telephone line 12 via a telephone hybrid circuit 11.

Reference numeral 18 is a low frequency oscillator whose input side is connected to the telephone hybrid circuit 11, and oscillates a low frequency wave modulated by a single signal.

9 is a transmitter, and the telephone hybrid circuit 1
1 and a low frequency oscillator 18, and transmits an audio signal and a ringer signal on a carrier wave.

17 is a low frequency detection circuit whose input side is connected to the receiver 8, which further demodulates the tone signal received and demodulated by the receiver 8 to generate a dialing signal and a pulse code signal as explained later. To detect.

The dialing signal demodulation circuit 14 is based on this low frequency detection circuit 1.
7, a transistor Tr2, an amplifier AMP1, and an inverter INV5, the output side of which is connected to the dialing relay 13 of the telephone hybrid circuit 11 via an AND circuit AND6, and according to the dialing signal, This dialing relay 13 is turned on and off.

16 is a line connection holder, and 19 is a carrier buffer.

The carrier buffer 19 inputs the carrier wave output from the receiver 8 and outputs a reset signal to the line connection holder 16 and a transmitter control signal to the transmitter 9.

The carrier buffer 19 includes NOR circuits N0RI and N0R2.
It has an RS flip-flop 30 consisting of.

The input side of the RS flip-flop C1ear is the differentiator circuit 3.
1 and an amplifier AMP2 to the carrier wave control output terminal of the receiver 8.

The output from the carrier wave control output terminal is T when the receiver 8 receives the carrier wave.

The Preset input of the RS flip-flop 30 is connected to the carrier wave control output terminal of the receiver 8 via a differentiating circuit 32, an amplifier AMP3, a delay circuit 33, an inverter INV6, and the amplifier AMP2.

The output ■ of the RS flip-flop 30 is an OR circuit OR2
and is connected to the transmitter 9 via the transistor Tr4.

The output [F] is connected to one input side of the OR circuit OR3 via the inverter INV7 and the differentiating circuit 34, and is also connected to the other input side of the OR circuit OR3 via the differentiating circuit 35.

The output side of the OR circuit OR3 is connected to the line connection holder 16.

The other input side of the OR circuit OR2 is connected to the telephone hybrid circuit 11 to input a ringer signal.

Next, the operation of this carrier buffer 19 will be explained.

FIG. 4-a is a timing chart. When the receiver 8 receives a signal from the mobile telephone, the carrier wave control output becomes ``'', and the pulse is sent to the C1 of the RS flip-flop 30 by the differentiating circuit 31 via the amplifier AMP2.
Enter in ear.

This RS flip-flop 30 is set to Pre when the power is turned on.
Since a pulse is sent to the input s through the capacitor C3, the output @ is initially L'' and the output [F] is H''.

Therefore, when a pulse is input to C1ear as described above, the output is inverted, the output 0 becomes ■'', and the output [F] becomes L''.

When the output [F] reaches T', the output 0 of the inverter INV7 becomes '', a pulse is sent out from the output (2) of the differentiating circuit 34, and a reset pulse is output from the output (2) of the OR circuit OR3.

On the other hand, the output @ of the RS flip-flop 30 is m'', and the transistor Tr4 is
is turned ON and a transmitter control signal is input to the transmitter 9.

As a result, the transmitter 9 becomes activated.

After the transmission/reception is completed, the carrier wave control output is from °IJst.
When the voltage becomes Ltt, the output of the amplifier H2 becomes L'', and the output of the inverter INV6 becomes m'''.

The delay circuit 33 delays the amplifier AMP3 by T time.
The output of becomes "H", a pulse is inputted to the Preset input of the RS flip-flop 30 by the differentiating circuit 32, the output 0 [F] is inverted, ■ becomes 'L', [F]
becomes ``゛.

When [F] becomes "H", a pulse appears on the output side Φ of the differentiating circuit 35, and a reset pulse is outputted to the output (2) of the OR circuit OR3.

Therefore, in this embodiment, a reset pulse is output at the start and end of transmission and reception, respectively.

Note that the transmitter control is also performed when the ringer signal is input to the OR circuit OR2, and the transmitter 9 is also activated by the ringer signal.

Next, the line connection holder 16 will be explained.

This line connection holder 16 includes a decimal counter 40, a latch circuit 41 with reset, a decoder 42, and a delay circuit 4.
3.

The input side of the counter 40 is connected to the output side of the amplifier AMP1 of the dialing signal demodulation circuit 14, and counts by inputting the pulse codes of the long marks and short marks detected by the low frequency detection circuit 17.

The reset terminal (R8T) of the counter 40 is connected to the output side (2) of the OR circuit OR3 of the carrier buffer 19, and inputs a reset pulse.

The output terminals ■a■■ of the counter 40 are AND circuits AN, respectively.
D? , AND8. AND9. Connected to one input side of ANDlo.

The output terminal (2) is connected to a counter enable (CE), and the input to the counter 40 is prohibited by the fifth pulse.

The delay circuit 43 is connected to the amplifier AMP1 via the inverter INVB, erases the short mark pulse, and outputs only the long mark pulse via the inverter INV9 and the amplifier AMP4 to the AND circuit AND? .

AND8. AND9. It is configured to input to the other input side of ANDl 0.

AND circuit AND7. AND8, AND9. ANDI
Each output Q [phase] 0 [F] of O is input to the latch circuit 41.

A reset terminal (R8T) of this latch circuit 41 is connected to the reset output of the carrier buffer 19.

The output @(F!tcJ[F] of the latch circuit 41 is connected to the decoder 42.

This decoder 42 is a binary/decimal code converter, and in this embodiment, as described above, since the BCD code is used, its output terminals are from ■ to [phase].

Further, in this embodiment, since the specific code is a decimal number n3u, the output terminal (2) of the decoder 42 is connected to one input side of the AND circuit AND6.

Next, the operation of this line connection holder 16 will be explained with reference to FIG. 4-a.

When the carrier wave control output of the receiver 8 becomes "H", a reset pulse is output from the carrier buffer 19, and the counter 40 and latch circuit 41 are reset.

The long mark and short mark pulse codes detected by the low frequency detection circuit 17 are input to the counter 40, where they are counted, and pulses are sequentially output from the output terminal ■■■■.
Each AND circuit AND7゜AND8. AND9. AND
Input to one input side of l0.

When the fifth pulse is input, the output terminal ■ becomes °T(+1
and input is prohibited.

On the other hand, the pulse of the long mark and short mark is the impark INV
8 to a delay circuit 43, where the short mark pulses are erased and only the long mark pulses are output.

The long mark pulse is passed through the inverter INV9 and the amplifier A.
Through MP4, AND circuit AND? , AND8°AN
D9. It is input to the other input side of ANDl 0.

AND circuit AND7. AND8. AND9. ANDIO
Then, each output from the counter 40 is ANDed with the long mark pulse and input to the latch circuit 41.

In this embodiment, since the digital code is 0011'', pulses are output to the latch circuit 41 from the outputs of the AND circuits ANDγ and AND8.

The pulse code latched by the latch circuit 41 is converted into a decimal number by the decoder 42 and output from a specific terminal.

In this example, as mentioned above, the terminal is selected to be 3" in decimal, so the specific code is 3" in decimal.
Only when this happens, the output terminal (2) of the decoder 42 becomes n'', the gate of the AND circuit AND6 is opened, and the dialing signal demodulation circuit 4 is closed.

Next, FIG. 5, which explains the overall operation of this mobile telephone device, is a timing chart thereof.

When you lift the handset 1, the hook switch 7 goes up and
Transmitter 4 is activated and a carrier wave is sent.

After a delay of a certain time T, the line connection holding signal generator 15 outputs a specific pulse code (in this embodiment, a decimal number b), and the low frequency oscillator 5 outputs a tone signal modulated by the code. The transmitter 4 sends out the signal on a carrier wave.

Next, when the dial 6 is turned, a dialing signal is output, and the low frequency oscillator 5 outputs a tone signal modulated by the dialing signal, which is similarly transmitted by the transmitter 4 on a carrier wave.

Therefore, in this embodiment, the pulse code and dialing signal are sent out after modulating the low frequency, and the carrier wave is further modulated, so that disconnection of the line due to other harmful waves is unlikely to occur. It has become.

The signal transmitted by the transmitter 4 is received by the receiver 8 of the base station.

When the receiver 8 first receives a carrier wave, its carrier wave control output becomes 1'', and the carrier buffer 19 outputs a reset signal and a transmitter control signal.

The reset signal is input to the line connection holder 16 and resets the counter 40 and latch circuit 41.

However, in this embodiment, the reset signal is output even when the carrier wave control output becomes L'', so the counter 40 and latch circuit 41 have already been reset in the normal state.

The reason why the reset is performed twice in this way is to deal with noise and the like.

When the transmitter control signal is output, the transmitter 9 is activated.Next, when the pulse code signal is input to the receiver 8, it is detected and demodulated here and becomes a tone signal, which is sent to the low frequency detection circuit 17. , and only the pulse code signal is detected.

The pulse code signal is input to the line connection holder 16 and is output to the output terminal of the decoder 42 only if the pulse code is a specific pulse code, i.e. 3'' in decimal in this example. An output appears at (2), and one input side of the AND circuit AND6 becomes ``[+1''.

On the other hand, since an output is obtained on the output side of the low frequency detection circuit 17 at the same time as the arrival of the carrier wave, the transistor Tr2,
The other input terminal of the AND circuit AND6 has already become n'' through the amplifier AMP1 and the inverter INV5.

As a result, the conditions of the AND circuit AND6 are satisfied and an output is obtained, which energizes the dialing relay 13 and connects the telephone line 12.
Turn on.

In other words, the dialing demodulation circuit 12 is closed and the telephone line is connected.

Subsequently, when the dialing signal is received by the receiver 8, only the dialing signal is similarly extracted by the low frequency detection circuit 17 and sent to the other input of the AND circuit AND6 via the transistor Tr2, the amplifier AMP1, and the inverter INV5. A dialing signal is output from the output side of the AND circuit AND6, which turns the dialing relay 13 on and off, making it possible to call the other party's station via the telephone hybrid circuit 11 and the telephone line 12.

In this embodiment, malfunctions such as calls to a base station by other mobile telephones are determined and prevented based on the presence or absence of a carrier wave in addition to pulse code matching according to the present invention and conventional frequency matching. are doing.

When the call ends and the handset 1 is hung up, the hook switch 7 is lowered and transmission from the transmitter 4 is stopped.

The carrier wave control output of the receiver 8 also changes from ``tr'' to +Ll'', the transmitter control signal of the carrier buffer 19 also changes from H'' to L'', the transmitter 9 also stops, and at the same time the carrier buffer 19 outputs a reset signal. , resets the counter 40 and latch circuit 41 of the line connection holder 16.

As described above, according to the present invention, a base station is called from a mobile telephone based on a coincidence of pulse codes, so that malfunctions such as the base station being called by another mobile telephone can be prevented.

Furthermore, by rearranging the pulse codes, it is possible to provide multiple channels.

In addition, the pulse code combines long mark pulses and short mark pulses, and can be coded simply by the presence or absence of pulses.

Since the signals are not coded, there is no confusion with dialing signals.

Furthermore, since the pulse code is generated by selecting a long mark pulse or a short mark pulse using a switch array, it is extremely easy to change the pulse code for each machine.

Furthermore, since the pulses are counted by a counter and the pulse code is transmitted serially using the output, there is no need to use a separate pulse generator for the counter, and the number of code bits can be increased by increasing the capacity of the counter. You can increase it to any number if you want.

A counter is also used to decode the code on the base station side.
Since this counter is reset in response to the first rising edge of the signal transmitted from the telephone, it is effective in preventing malfunctions.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic structure of a mobile telephone according to the invention, and FIG. 2 is a block diagram showing the basic structure of a base station according to the invention. FIG. 3 is a block diagram showing an embodiment of the mobile telephone of the present invention, FIG. 4 is a block diagram of a base station, and FIGS. 3-a, 4-a, and 5 are timing charts. . In the figure, 1 is a handset, 2 is an audio amplifier, 3 is a receiver, and 4
is a transmitter, 5 is a low frequency oscillator, 6 is a dial, 7 is a hook switch, 8 is a receiver, 9 is a transmitter, 10 is an audio amplifier, 11 is a telephone hybrid circuit, 12 is a telephone line, 13 is a dialing 14 is a dialing signal demodulation circuit, 15 is a line connection holding signal generator, 16 is a line connection holder, 17 is a low frequency detection circuit, 18 is a low frequency oscillator, 19 is a carrier buffer, 20 is a counter, 21 is a Switch array, 22 and 23 are pulse generators, 24 is a waveform shaping circuit, 25 is a low frequency detection circuit, 30 is an RS flip-flop, 31, 32° 34.35 is a differentiation circuit, 3
3 is a delay circuit, 40 is a counter, 41 is a latch circuit, 4
2 is a decoder, and 43 is a delay circuit.

Claims (1)

[Claims] 1. A mobile telephone comprising a transmitter, a receiver, and a low-frequency oscillator connected to the transmitter to input a dialing signal and output a tone signal modulated by the dialing signal, and a transmitter. A telephone is connected to the mobile telephone, and a receiver is connected to the receiver, and in response to a signal transmitted from the mobile telephone, a communication line is turned on, and a dialing signal is demodulated, and in response to the dialing signal, the communication call is made. A mobile telephone device comprising a dialing signal demodulation circuit that intermittents a communication line and a base station connected to the communication line, the mobile telephone device is connected to a low frequency oscillator of the telephone and generates a specific pulse code to generate a specific pulse code. a line connection holding signal generator that is input to a low frequency oscillator and outputs a tone signal modulated by the pulse code, which is transmitted by the transmitter on a carrier wave; a dialing signal demodulation circuit of the base station and a receiver; deciphering the pulse code signal from the line connection holding signal generator connected to the machine, determining whether the signal is a specific pulse code, and if the signal is a specific pulse code, the dialing signal demodulating circuit a line connection holder that is turned ON, and the line connection holding signal generator includes: means for generating a timing signal after the handset is lifted; and a first pulse generator for generating a long mark pulse train by the timing signal. a second pulse generator that generates a similar mark pulse train in synchronization with the generation of the long mark pulse train, and selectively connected to the output side of the first pulse generator or the second pulse generator. A switch array consisting of at least two or more switches, at least two or more AND circuits whose input side is connected to each switch of the switch array and whose output side is connected to the low frequency oscillator, and the other of each of the AND circuits. Connect to the input side of
N, and means for stopping the pulse generation of the first pulse generator and the second pulse generator when the counted value of the counter reaches a predetermined value, and the line connection holder is , a device for detecting long mark and short mark pulse signals transmitted from a telephone set and received by a receiver of a base station; a device for outputting only long mark pulses among the detected pulses; and a device for inputting the long mark pulses. a counter that counts the long mark and short mark pulses and sequentially turns on each AND circuit according to the counted value; and the first rising edge of the signal transmitted from the mobile telephone. and a device that resets the counter in response to a code signal, and a device that normally turns off the dialing signal demodulation circuit, inputs the output from each AND circuit as a code signal, and demodulates the dialing signal when the code signal matches a predetermined code. 1. A mobile telephone device comprising a switch device that turns on a circuit.