JPS60139049A - Automatic answering telephone set - Google Patents

Abstract

PURPOSE:To prevent assuredly wiretap by applying the titled device with remote control to inhibit the remote control of a remote controller. CONSTITUTION:When switches 5-1-5-4 are pushed successively, the remote control signals codes are registered to an input register 31. Then a switch 5-5 is pushed the codes registered to the register 31 are stored to an RAM32-1. A remote control indication stop code is registered to the register 31 by the switch 5-5 and then stored to an RAM32-2. Then a remote control signal code is registered. The contents of the register 31 are compared with those of the RAM32-2 when the set time of a timer 35 elapses. When the coincidence is obtained from this comparison, a register 37 is set at 1. Under such conditions, the next input remote control signal is coincident with the set remote control signal code. Even in such a case, however, no registration is fed to an output register 34 for remote control. Thus the remote control is inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an answering machine that uses a telephone signal from a telephone as a remote control signal.

In this type of answering machine, remote control is performed using a button signal from the telephone as a remote control signal.

In this case, no matter how complex the remote control signal code is, it is possible to eavesdrop, and there is a problem in that it is impossible to prevent eavesdropping when the matter requires secrecy.

Furthermore, answering machines that use a telephone signal as a remote control signal have the disadvantage that they are easily intercepted because they do not require a remote control device.

The present invention has been made in view of the above, and an object of the present invention is to provide an answering machine that reliably prevents eavesdropping.

The present invention will be explained below using examples.

FIG. 1 is a block diagram showing one embodiment of the present invention.

1 is a remote controllable answering machine. 2 is the mechanical control and circuit section of the answering machine 1. 3 is a control circuit, and 4 is a bell signal detection section. 5 is an input key switch, and in this embodiment, 5 +, 5-2t5
a, 5 < are codes “1”, “4”, respectively.
A7 is a switch for setting "*", 5-5 is a switch for registration, and 5-6 is a switch for cents. 6 is a detection switch that identifies and detects the telephone signal from the central office line. A circuit, for example, a second circuit as described below.
It is configured as shown in the figure.

The control circuit 3 includes switches 5-1 to 5-1 in the input key switch 5.
5-4 and the output of the detection circuit 6 as inputs, and the output of the input register 31 is connected to the switch 5-5.
RAM 32-1 is stored by the output of switch 5-6 and cleared by the output of switch 5-6.

32-2, RAM32 + t 32-2
The configuration is such that the selection can be set by selecting switches 41 and 42. In addition, 38 is switch 4
This is an instruction circuit that instructs the selection of RAMs 32r and 32-2 by the output of 1.42.

In addition, the control circuit 3 includes a timer 35 that measures a predetermined time after inputting the input register 31, and the contents of the input register 31 and the RAM.
32-1.32 Comparison operation section 33 that compares the memory contents of 2 and detects a match, an output register that temporarily stores the detection output of the comparison operation section 33 and supplies output to mechanism control and circuit section 2, remote control Discrimination flag register 37, register 31, RAM 32 4. 32
2, a ROM 36 that stores a program for controlling a comparison calculation section 33, an output register 34, and a timer 35.

Further, as shown in FIG. 2, the detection circuit 6 generates a signal with a wave number of 11, 1209 H centered on the station line, if the control signal codes correspond to the numbers "1", "4", "7", and the symbol "H", for example.
z bandpass filter 61 and 697-941Hz
A band-pass filter 63 is connected, and the output of the band-pass filter 61 is supplied to a rectifier circuit 62, and the output of the rectifier circuit 62 is supplied as a mute signal to a response signal sending amplifier 6.
It is supplied to 8. The output of the bandpass filter 63 is
PLL circuit 6 that detects the presence of a 697Hz frequency component
4. PLL circuit that detects the presence of the 770Hz frequency component 65. PL that detects the presence of the frequency component of 852H2
L circuit 66.941f (circumference of z..., D-, O,
8o, 1. -Yu. □91, Yushi, rectifier circuit 62, PLL
The outputs of circuits 64-67 are supplied to control circuit v&3.

In addition, 8 is a telephone attached to the answering machine, and 9
is an external telephone, and 10 indicates a telephone exchange.

Currently, the remote control instruction codes are “1” and “4”.

"4" ulm, "*", the remote instruction code is stored in the RAM 32+, and the remote control instruction stop code is, for example, "4", "7" a7m, m*", "
1", and the remote control instruction stop code is set by the switches 41 and 42 so as to be stored in the RAM 322. When the number set in the flag register 37 is "0", the remote control operation can be performed, and the number set is When it is "1", acceptance of remote control operations is stopped.

In one embodiment of the present invention configured as described above, by pressing the switch 5-6, the output of the switch 5-6 is read and stored in the RAM 32 + .

, 32* are cleared. Then, by sequentially pressing switches 5 1, 5 2, 5 2.5 3.5 4, switches 5-IH5215*, 5 s
, 5"4 are read, and the remote control signal code "1" is input to the input register 31.

4", "4", "7", and "*" are entered. Then, by pressing the switch 5-5, the input register 3
A digit of 1 is stored in RAM 32 + . Then, "4" is written to the input register 31 in the same way.

The numbers "7", "7", "*゛", and "1" are entered, registered by the switch 5-5, and stored in the RAM 322.

Through the above steps, the remote control signal code and remote instruction stop code are registered.

On the other hand, by setting the telephone answering machine 1 to a standby state, the flag register 37 is set to "0".

Next, the operation of the detection circuit 6 will be explained. The correspondence between the numbers, symbols, and frequencies of the button signals from the button telephone is as shown in Table 1.

Table 1 For example, by pressing number 1, 69711z and 1209H
A mixed wave signal with 2 is output.

So, from Table 1, 1209 Hz is number "1".

It is a frequency component common to “4”, “7”2, and the symbol “*”, and 697 to 941 Hz is the number u1”, “4”, “7”.
”, it can be seen that they correspond to the frequency components of the mixed signal components with the symbol “*” except for the 1209 Hz component.

Now, when the telephone signals corresponding to the numbers "1", "4", "7" and the symbol "*" enter the central office line, a component of 1209 Hz is present in each of the telephone signals. Therefore, the 1209 Hz component is filtered through band pass filter 6.
1 and is rectified by a rectifier circuit 62. Rectifier circuit 62
The response signal sending amplifier 68 is muted by the output of , and no response signal is output onto the station line. As a result, only the telephone signal remains on the central office line. on the other hand,
The bandpass filter 63 also generates an output, and when the P-noshphon signal is number "1", a 697 Hz component is output from the bandpass filter 63, and the PLL circuit 64 detects this. Further, when the number is "4", a 770Hz component is output from the bandpass filter 63 and the PLL circuit 65
detects this.

Also, when the number is "7", the band pass filters 63 to 8
A 52 Hz component is output, and the PLL circuit 66 detects this. Also, when the symbol "*" indicates band pass filter 6
The components from 3 to 941H2 are output, and the PLL circuit 67 detects them.

Therefore, when the rectifier circuit 62, PLL circuit 64 generates an output, the button signal with the number "1" is output, and when the rectifier circuit 63 and the PLL circuit 65 generate an output, the button signal with the number "4" is output. Circuit 63 and P
When the LL circuit 66 generates an output, the button signal with the number "7" is supplied, and when the rectifier circuit 63 and the PLL circuit 67 generate the output, the button signal with the symbol "*" is supplied to the central line.

When detected, the answering machine performs a general call receiving operation. After detecting the call, the external telephone 9 then calls the number''
1", "4', 4", "7", and the symbol "*", the detection circuit 6 works as described above and outputs from the rectifier circuit 62 and the PLL circuits 64 to 67. Occur.

The control circuit 3 receiving this output connects the output of the rectifier circuit 63 and P
``1'' is placed in the input register 31 by the AND output with the output of the LL circuit 64. Therefore, similarly, the input register 31 has "1" and "4".

The numbers 4'', 7'', and ``*'' are entered.

After completing this setting, the timer 35 is driven, and the timer 35
When a set time of, for example, 3 seconds has elapsed, the contents stored in the input register 31 and the contents stored in the RAM 32+ are compared in the comparison calculation section 33. In this case, the RAM 32-1 also has "1', "4", "4", 7", *" due to the above registration.
is stored, the comparison calculation unit 33 outputs an output indicating that they match to the mechanism control unit and the circuit unit 2 via the output register 34. The answering machine is therefore remotely controlled. Of course, this is because the flag register 37 is set to "0".

An example of a remote control operation is the reproduction of a message recorded on a business tape.

Furthermore, if the button signal as the remote control signal code is a signal other than "1", "4", "4", "7", or "*", the comparison calculation unit 33 will not detect a match. remote control operation is not possible. Also, “1”
The same holds true even if another button signal such as "1" is supplied next to "*" such as "4", "4',""7","*", or "1".

At this time, the period of 3 seconds after "*", that is, the timer 3
There must be a period of set time according to 5.

In addition, in the above case, the button signal is “l”, “4”, “4”
, "7", "*", but it is also possible to continuously supply the button signals corresponding to the same number a predetermined number of times, for example, "ji, 4", '4',
It may be like ``4'' in a row five times, such as ``su'', 4''.

Also, by remote control, you can play back the message recorded on the business tape, check it, and if it is a message that should not be intercepted, call the number "4" from the telephone 9.

7", 7", "*", and 1" are sent out.

As a result of this transmission, the input register 31 receives 4''.

The numbers "7", "7", "*", and "1" are entered.

After completing this setting, the timer 35 is driven, and the timer 35
When the set time has elapsed, the contents of the input register 31 and R
The comparison calculation unit 33 compares the memory contents of the AM 32-2. In this comparison, a match between the storage contents of the RAM 32-2 and the number set in the input register 31 is detected, and the flag register 37 is set to "1". In this state, even if the next input remote control signal matches the remote control signal code, the flag register 37 is set to 1- and ++, so the output register 34 is set to perform remote control. is not performed, and remote control of the answering machine is prohibited. Here, for example, the flag register 37
When set to "l", a beep tone may be sent to the caller via the central office line, and the caller receives the beep tone, indicating that remote control is disabled. can be confirmed.

Further, the number set in the flag register 37 may be checked either after the comparison by the comparison calculation section 33 or before the comparison.

As explained above, according to the present invention, since the remote control of the answering machine can be prohibited by remote control,
Eavesdropping can be reliably prevented by prohibiting remote control in places where it would be a problem if eavesdropping were to occur.

[Brief explanation of drawings]

FIG. 1 is a program diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a block diagram showing an example of a detection circuit in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Answering machine device, 2... Mechanism control and circuit section, 3... Control circuit, 4... Bell signal detection section, 5.
...Input key switch, 6...Detection circuit, 9...External telephone, 31...Input register, 32-1 and 3
2-2...RAM, 33...Comparison calculation section, 34...
- Output register, 35... timer, 37... flag register, 61 and 63... band pass filter, 62... rectifier circuit, 64-67... PLL circuit.

Claims (1)

[Claims] A remote controllable answering machine includes a first storage means for storing a preset remote control signal code, a second storage means for storing a preset remote control instruction stop code, and a first storage means for storing a preset remote control instruction stop code. an instruction means for instructing prohibition or non-prohibition; a detection circuit that receives a phone signal transmitted after detecting a call from an external telephone and generates a code output corresponding to the phone signal; and an output from the detection circuit. a first comparing means for comparing the code output from the detection circuit with a remote control signal code stored in the first storage means to detect a match; and a comparison means for instructing the instruction means to prohibit when a match is detected by comparing stored remote control instruction prohibition codes, and the first comparison means only when the instruction means does not instruct prohibition. 1. An answering machine characterized in that remote control is performed based on a match detection output.