JPH01251945A - Automatic answering telephone system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an answering machine, and more particularly to an answering machine that is connected to a doorbell and can automatically answer calls from the doorbell.

(Prior Art) Conventionally, an answering machine has been proposed which is connected to a doorphone, automatically answers a call from the doorphone, and then records the message inputted from the microphone of the doorphone. This conventional device has a means for playing back the recorded content and outputting it to a speaker, or for listening to it from an external telephone, so that the user of this device can listen to the recorded business after returning home.
It is equipped with a means to play the recorded content and output it to an outside line.

(Problems to be Solved by the Invention) As described above, the conventional device is configured so that the recorded matter can be played back by the owner's operation.

However, if there is an urgent matter, the visitor needs to call the owner immediately and convey the matter, but conventional devices do not have a means to contact the owner immediately. do not have. Therefore, the current situation is for visitors to find out the owner's out-of-home phone number and call them from another phone to inform them of their emergency needs. This has resulted in the inconvenience that emergency requirements cannot be communicated immediately or at all.

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 allows the owner and a visitor to immediately talk on the phone by calling the owner's telephone outside the home from a doorbell.

[Structure of the invention]

(Means for Solving the Problems) To achieve the above object, the present invention provides an answering machine having the configuration shown in FIG. That is, the answering machine according to the present invention includes a door phone 1, a door phone 1, and an outside line 3.
The door phone 1 has a calling means 11 for making a call, and a calling means 12 for making a call through a communication path 4 connected to the answering machine main body. The answering machine main body 2 includes a doorbell call detection means 2 for detecting a call from the doorphone.
1, a communication path 5 connected to the door phone 1, and a communication path 6 connected to the outside line 3, and both reverse communication paths 5.6
a communication path forming means 22 for forming a communication path between the door phone 1 and the outside line 3 by connecting a transfer dial number, a transfer dial number registration means 23 for inputting a transfer dial number and storing the transfer dial number, and a transfer dial number registration means 23 for inputting a transfer dial number and storing the transfer dial number; Detection means 21
transfer dialing means 24 receives the detection signal and sends the stored transfer dialing number to the outside line 3; and communication path formation control means 25 for instructing.

(Function) In the above configuration, the owner stores in advance the dial number of the telephone at his/her destination as a transfer dial number in the main body of the answering machine. Thereafter, when there is a visitor and a call is made from the doorbell and a predetermined password is input, the dial number is sent to an outside line from the main body of the answering machine to call the telephone of the owner at his/her destination. When the owner answers this, the main body of the answering machine establishes a communication path between the doorbell and the outside line, and a call is immediately made between the visitor and the owner.

(Example) Examples will be explained below.

FIG. 2 is a block diagram showing the main body of an answering machine in one embodiment of the answering machine according to the present invention.

This answering machine main body includes door phone terminals DI and D2 for connecting a door phone. Although the doorbell connected here is not shown, in addition to the usual doorbell configuration, which includes a means for making a call and a means for making a call, a means for the visitor to enter a PIN number is required. . This password input means may have a configuration similar to that of the dialing means of the answering machine body, which will be described later.
In other words, the switching transistor (5
5), a dial circuit (57) for driving this or emitting an MF multiplied signal, and a dial key (62) for giving dial information to this. If such a configuration is adopted, the PIN number is dial pulse or M
It will be input to terminals DI and D2 in the F-fold signal format.

2 through the door phone power supply circuit 40 to the terminals DI and D2.
A line communication path 41 is connected to the two-line communication path 41, and an intercom incoming call detection circuit 42, a password detection circuit 43, an intercom call end detection circuit 44, and an intercom communication circuit 45 are connected to the two-line communication path 41. The doorphone power supply circuit 40 supplies constant voltage DC power to the doorphone. The door phone incoming call detection circuit 44 detects a call from the door phone and sends the detection signal to a central processing circuit (CPU) 46. The password detection circuit 43 detects a password entered manually from the doorbell (by MF multiplication signal or dial pulse) and sends it to the CPU 46. The doorphone call end detection circuit 44 detects the end of communication between the doorphone and the outside line and sends the detection signal to the CPU 46. The doorphone communication circuit 45 outputs a communication signal sent from the doorphone via the 2-wire communication path 41 to the 4-wire communication path 48 through a 2-wire 4-wire conversion circuit (not shown), and outputs the communication signal sent from the doorphone via the 2-wire communication path 41 to the 4-wire communication path 47 The communication signal from the 2-wire communication line 41 is outputted to the 2-wire communication path 41 through the 2-wire/4-wire conversion circuit. The door intercom call circuit 45 also has a function of outputting a hold tone signal from the hold tone circuit 49 to the two-wire call path 41.

The connection relationship between the four-wire communication path 48 from the door phone communication circuit 45, the four-wire communication path 51 from the handset 50, and the four-wire communication path 53 from the outside line communication circuit 52 is switched by the communication switching circuit 54. There is. This call switching circuit 54 selects the call path to be connected based on a command from the CPU 46. An example of this call switching circuit 54 is shown in FIG. The four-wire communication path 48 from the door intercom communication circuit 45 can be connected to one of the four-wire communication paths 541 or 542 by a changeover switch 543. In addition, the 4-wire communication path 53 of the outside line communication circuit 52 is connected to the changeover switch 5.
44 allows connection to one of the four-wire communication paths 541 or 542. A 4-wire communication path 51 from the handset 50 is connected to a 4-wire communication path 541. The changeover switches 543 and 544 are configured to be changed over by a command from the CPU 46. When the changeover switch 543 is located on the side of contacts C and G as shown in FIG. 3(a), the door intercom communication circuit 45 and the handset 50 are connected.

As shown in the same figure (b), the changeover switch 544 is connected to contacts A and E.
When located on the side, the outside line communication circuit 52 and the handset are connected.

In addition, when the changeover switch 543 is in contact and located on the H side and the changeover switch 544 is located in the contact B and F sides as shown in FIG.
are connected.

The other terminal of the outside line communication circuit 52 is connected to a two-wire communication path 74, into which a switching transistor 55 is inserted. The two-wire communication path 74 is connected to the two-wire communication path 54 via the bridge circuit 56, and the two-wire communication path 54 is connected to the terminals LL and L2. This terminal LL
, L2 are connected to an outside line (not shown). The outside line communication circuit 52 outputs the communication signal sent from the outside line via the 2-wire communication path 54.74 to the 4-wire communication path 53 through a 2-wire/4-wire conversion circuit (not shown), and converts the communication signal into the 4-wire communication path 53. The communication signal from line 53 is output to two-wire communication line 74 through the two-wire/four-wire conversion circuit. In addition, this outside line communication circuit 5
2 is the MF double signal 2-wire communication path 74 from the dial circuit 57
．． 54 to the outside line, and the voice synthesis circuit 5
It also has a function of outputting the audio signal sent from the 8 through the amplifier 59, the low-pass filter 60, and the output selector switch 61 to the 4-wire communication path 53 or the 2-wire communication path 74.

The dial circuit 57 is a circuit that generates a signal corresponding to the input number from the dial key 62, and is switched to each mode of dial transmission, password registration, or transfer dial registration depending on the set position of the registration switch 84. In the dial transmission mode, the dial pulse or MF multiplier signal corresponding to the input number of the dial key 62 is output to the outside line. Selection of the dial pulse and the MF multiplied signal is performed by the selection switch 63. In the case of dial pulse transmission, a dial pulse is generated by driving the switching transistor 55, and in the case of MF signal transmission, the MF multiplied signal is sent to the outside line through the outside line communication circuit 52. In the password registration mode, the CPU 4 uses the input number from the dial key 62 as the password.
Send to 6. This password will be written into the password memory 82. In addition, in forward dial registration mode,
The input number from the dial key 62 is sent to the CPU 46 as a transfer dial number. This transfer dial number will be written into the transfer dial memory 83.

Connected to the two-line communication path 54 is an outside line response detection circuit 64 that detects a response from an outside line telephone to a dial call. The detection signal of this outside line response detection circuit 64 is transmitted to the CPU 46.
sent to.

Also. A ringer circuit 67 is connected to the two-wire communication path 54 via a relay switch 65 and a bridge circuit 66.
An outside line incoming detection circuit 69 and a transformer 70 are connected to the output of the ringer circuit 67 via a hook switch 68, and a speaker 71 is connected to the secondary side of the transformer 70.

The relay switch 65 is normally located on the contact a side,
Through this, an incoming signal from an outside line is input to the ringer circuit 67. When there is an incoming call, the ringer circuit 67 sends a bell signal to the speaker 71 and the outside line incoming detection circuit 6.
As a result, a ringing tone is emitted from the speaker 71, and an incoming call detection signal is sent from the outside line incoming detection circuit 69 to the CPU 46. The relay switch 65 is controlled by the relay controller 72, and the CPU 46 instructs the relay controller 72 to switch the relay switch 65 to the contact side when receiving an incoming call detection signal.

This captures the outside line.

A hook switch 73 is provided in parallel to the relay switch 65. This hook switch 73 is the handset 5
0 off-hook. Further, the other hook switch 68 is opened by off-hook.

The input of the speech synthesizer 58 is connected to the output of the two-wire communication path 74 and the microphone 75 via an input selector switch 76, an amplifier 77, and a low-pass filter 78. The manual changeover switch 76 connects either the two-wire communication line 74 or the output of the microphone 75 to the amplifier 77 according to a command from the CPU 46. The voice synthesis circuit 58 converts the analog voice signal inputted from the two-wire communication line 74 or the microphone 75 into a digital signal and sends it to the CPU 46.

The voice signal input from the two-wire communication path 74 is written into the business recording memory 79, and the voice signal input from the microphone 75 is written into the response message memory 70.

The voice synthesizer 58 also has a function of converting the digital voice signal read from the memory 79, 80 into an analog voice signal and outputting the analog voice signal. The output of this voice synthesis circuit 58 is connected to the outside line communication circuit 52 and the input of an amplifier 81 via an amplifier 59, a low-pass filter 60, and an output changeover switch 61, and the output of the amplifier 81 is connected to a speaker 71. The output selector switch 61 switches the output of the low-pass filter 60 to the outside call circuit 52 according to a command from the CPU 46.
FIG. 4 is a functional block diagram of the CPU 46, which is connected to one side of the amplifier 81.

Hereinafter, the functions of the CPU 46 will be explained with reference to the same figure.

The door phone incoming call detection means 101 is the door phone incoming call detection circuit 4
In response to the detection signal from 2, a command is sent to call switching means 102, automatic response means 103, and relay control means 104.

The password detection means 105 receives the password from the password detection circuit 43 and sends it to the comparison means 106. When the comparison means 106 receives the above-mentioned password, it reads out the registered password from the password memory 82 and compares the two;
When there is a match, a command is sent to the transfer destination dialing means 107.

The door phone call end detection means 108 is the door phone call end detection circuit 4.
In response to the detection signal from 4, a command is sent to call switching means 102 and relay control means 104.

Transfer destination response detection means 109 receives the detection signal from outside line response detection means 64 and sends a command to call switching means 102,
Further, if there is no detection signal from the outside line response detection means 64 even after a predetermined number of rings have elapsed, a command is sent to the transfer destination absence transmission means 110.

The outside line incoming detection means 111 receives a detection signal from the outside line incoming detection circuit 69 and sends a command to the relay control means 104 and the automatic response means 103.

The call switching means 102 switches the state of the call switching circuit 54, and upon receiving a command from the door intercom call detection means 101 or a command from the transfer destination response detection means 109, the call switching circuit 54 switches between the door intercom call circuit 45 and an outside line call. A command is given to connect the circuit 52.

The automatic answering means 103 controls the automatic answering operation for incoming calls from a doorbell or an outside line, and in response to a command from the doorbell incoming call detection means 101 or the outside line incoming call detection means 111, the automatic answering means 103 controls the first answering message recording and reproducing means 112 and the first answering message. A command is sent to the sending means 113. The first response message recording and reproducing means 112 writes the first response message into the response message memory 80 and reads it from the response message memory 80. When receiving a command from the automatic response means 103, the first response message is recorded from the response message memory 80. 1 response message is read out and sent to the first response message sending means 113, and the output switching means 11
4 and turns on the outside line communication circuit side switch 61a of the output changeover switch 61. When the first response message sending means 113 receives a command from the automatic response means 103, it sends the first response message sent from the first response message recording and reproducing means 112 to the speech synthesis circuit 58. As a result, the first response message is sent to the outside line or doorbell via the outside line communication circuit 52. In addition, the first
A response message might be, for example, ``I'm away at the moment.

Please use the telephone answering machine to answer your questions. ”.

After sending the first response message, the automatic response means 103 sends a command to the business message input means 115. The business message input means 115 controls the recording of the other party's business message input from the doorbell or outside line, and sends a command to the manual switching means 116 in response to a command from the automatic response means 103 or the forwarding destination absence transmission means 110. Turn on the outside line call circuit side switch 76a of the sending input changeover switch 76 to input the business message input from the doorbell to the voice synthesis circuit 58, and also input the business message from the voice synthesis circuit 58 and use it. The received message is sent to the message recording and reproducing means 117. Message recording and playback means 117
writes the sent message to the message recording memory 79. Further, the matter recording and reproducing means 117 is provided by a dial circuit 57.
In response to a command (not shown) from the message recording memory 79, the message is read out and sent to the voice synthesis circuit 58, and a command is sent to the output switching means 114 to turn on the speaker side switch 61b of the output changeover switch 61. It also has the function of outputting a business message from the speaker 71.

Transfer dial transmitting means 107 sends a command to relay control means 104 in response to a command from comparison means 106 to control relay controller 72 to capture an outside line, and also reads a transfer dial number from transfer dial memory 83 and sends it to dial circuit 57. This is a call made to an outside line.

The transfer destination absence notification means 110 detects the transfer response detection means 109 when the transfer destination does not respond to the transfer dial call.
In response to the command output from the relay control means 104, the command is sent to the relay control means 104 to release the outside line capture state, and at the same time, the command is sent to the second response message recording and reproduction means 118 and the second response message sending means 119. The second response message recording and reproducing means 118 writes the second response message into the response message memory 80 and reads it from the response message memory 80. Upon receiving a command from the transfer destination absence transmitting means 110, the second response message is recorded in the response message memory. The second response message is read from 80 and the second response message is read out.
It sends the response message to the response message sending means 119, and also sends a command to the output switching means 114 to turn on the outside line communication circuit side switch point 61a of the output changeover switch 61. When the second response message sending means 119 receives a command from the forwarding destination absence transmitting means 110, the second response message recording and reproducing means 11
The second response message from 8 is sent to the speech synthesis circuit 58. As a result, the second response message is sent to the doorbell via the outside line communication circuit.

The second response message is, for example, something like ``I called you out of town, but I was unable to contact you.Please use the answering machine to answer your questions.''

After transmitting the second response message, the transfer destination absence transmitting means 110 sends a command to the business message input means 115. The operation of the manual message means 115 in response to this command is the same as in the case of the command from the automatic response means 103 described above.

The relay control means 104 is the relay controller 7
2 to control the acquisition and release of an outside line, and the doorbell incoming call detection means 101 and the outside line incoming detection means 11
1 or when there is a command from the transfer dial transmission means 107, the relay switch 65 is turned on to the contact side to capture the outside line, and when there is a command from the door phone termination detection means 108 or the transfer destination absence transmission means 110, the outside line is captured. Release the condition.

The first response message input means 120 and the second response message input means 121 send a command to the input switching means 116 in response to a command (not shown) from the husband dial circuit 57, and turn on the microphone side switch 76b of the input changeover switch 76. , the response message inputted from the microphone 76 via the voice synthesis circuit 58 is recorded by the first response message recording/reproducing means 112 and the second response message recording/reproducing means 118.
It is sent to First response message recording and reproducing means 1
12. The second voice message recording and reproducing means 118 writes the sent response messages into the first response message area and the second response message area of the response message memory 83, respectively.

The transfer dial input means 122 writes the transfer dial number inputted from the dial circuit 57 into the transfer dial memory 83.

The password input means 123 writes the password input from the dial circuit 57 into the password memory 82.

The holding tone sending means 124 sends a holding tone of a predetermined melody to the holding tone circuit 49 during transfer dialing according to a command from the transfer dialing means 107. This hold tone is sent to the door phone via the door phone call circuit 45.

Note that each means of the CPU 46 described above is realized by software.

In the above configuration, the operation of this embodiment when automatically answering an incoming call from the doorbell will be explained with reference to the flowcharts of FIGS. 2 to 4 and 5.

FIG. 5(a) shows an operation for setting a standby state for waiting for an incoming call. First, the first response message and the second
A response message is recorded (step Sl). That is, first, the main body of the answering machine is set to the first response message recording mode, and the first response message is manually inputted from the microphone 75.

The voice signal of this first response message is amplified and band-limited by an amplifier 77 and a low-pass filter 78, and then converted from analog to digital by a voice synthesis circuit 58 and sent to the CPU 4.
6, and is written into the first response message area of the response message memory 80 via the first response message input means 120 and the first response message recording/playback means 112. Next, the mode is set to a second response message recording mode, and a second response message is input from the microphone 75. This second
The audio signal of the response message is also sent to the CPU 4 via the same route as above.
6, and is written into the second response message area of the response message memory 80 via the second response message input means 121 and the second response message recording/playback means 118.

Next, a password is registered (steps S2 and S3). That is, set the registration switch 84 to "PIN code registration",
Enter the password using the dial key 62. This PIN number is input to the CPU 46 via the dial circuit 57, and then sent to the PIN memory 82 via the PIN input means 123.
written to.

Next, register the forwarding dial number (step S4.
5). That is, the registration switch 84 is set to "Register transfer dial number" and the transfer dial number is input using the dial key 62. This dial number is input to the CPU 46 via the dial circuit 57 and written into the transfer dial memory 83 via the transfer dial input means 122.

Next, the registration switch 84 is set to "off" (step S6). This causes the dial circuit 57 to enter the dial transmission mode. Next, the main body of the answering machine is set to answering mode (steps S6 and S7). As a result, the main body of the answering machine enters a call standby state. In this state, in the call switching circuit 54, the outside line call circuit 52 and the handset 50 are connected, and the door intercom call circuit 45 is disconnected from the others, as shown in FIG. 3(a).

FIG. 5(b) shows the operation when there is a call from the doorbell in the above-mentioned standby state.

When a visitor presses the call button on the doorbell, the call path switch in the doorbell is turned on, the call path in the doorbell is connected to the answering machine, and the call signal from the doorbell is input to the answering machine, The doorbell incoming call detection circuit 42 detects the ringing signal and sends the detection signal to C.
It is sent to PU 46 (steps 88-510). CPU46
Now, from the doorbell incoming call detection means 101 to the automatic answering means 1
03, commands are sequentially issued to the first response message recording and reproducing means 112, and the first response message is read out from the response message memory 80, sent to the voice synthesis circuit 58, and converted into an analog voice signal. At the same time, a command is also issued from the first response message recording and reproducing means 112 to the output switching means 124, and the outside line communication circuit side switch 61a of the output changeover switch 61 is turned on. Further, the call switching circuit 54 is switched to the state shown in FIG. 3(c) by a command from the intercom incoming call detection means 101 to the call switching means 102, and the outside line call circuit 54 and the intercom call circuit 45 are connected.

As a result, a first response message is sent to the doorbell (step 511).

While this first response message is being sent, if a password is entered from the doorphone keyboard, the password detection circuit 43 of the answering machine body detects this and the
Send to PU46. In the CPU 46, the comparing means 106 reads the registered password from the password memory 82 and compares it with the manually entered password (step 512).

If the PIN numbers do not match or there is no PIN input, automatic response means 1 will be activated after the first response message ends.
03, commands are sequentially issued to the business message input means 115 and the input switching means 116, and the outside line communication circuit side switch 76g of the input changeover switch 76 is turned on. As a result, the voice signal of the business input from the microphone of the doorbell is sent to the voice synthesis circuit 58, where it is converted from analog to digital, and written into the business record memory 79 through the CPU 46 (steps S13, 514).

When the recording of the business is completed and the visitor operates to end the call, the call path switch in the doorbell opens, the call end detection circuit 44 detects this, and sends a detection signal to the CPU 46 (step 514).
). In the CPU 46, a command is issued from the intercom detection means 108 to the call switching means 102, and the call switching circuit 54 is switched to the state shown in FIG. 3(a). As a result, the main body of the answering machine returns to the standby state.

If the entered PIN matches the registered PIN,
A command is issued from the comparison means 106 to the transfer dial sending means 107, and the transfer dial number is stored in the transfer dial memory 83.
At the same time, a command is sent from the transfer dial transmitting means 107 to the relay control means 104, and the relay switch 65 is closed to the contact side to capture the outside line. As a result, the dial circuit 57
A transfer dial number is sent to an outside line (step 516). Also, during this call, transfer dial calling means 1
07, a command is sent to the holding tone sending means 124, and the first
The transmission of the response message is stopped, and a hold tone of a predetermined melody is sent from the hold tone circuit 49 to the doorbell (step 517). The visitor knows from this hold tone that the transfer is taking place.

If the transfer destination telephone is busy or does not respond even after the predetermined number of rings (step 518), a command is sent from the transfer destination absence communication means 110 to the relay control means 104, and the outside line capture state is canceled and the call is made. is canceled.

Further, commands are sequentially issued from the transfer destination absence detection means 110 to the second response message recording and reproducing means 118, and the second response message is read out from the response message memory 80 and sent to the speech synthesis circuit 58. At the same time, a command is sent from the second response message recording and reproducing means 118 to the output switching means 114, and the outside line communication circuit side switch 61a of the output selection switch 61 is turned on. As a result, a second response message is sent to the doorphone (step S19).

When the sending of the second response message is completed (step 52
0), a command is issued from the forwarding destination absence transmitting means 110 to the message input means 115, and the message input from the microphone of the doorbell is written into the message recording memory (step 5).
21) When the recording is completed and a call termination operation is performed, the doorphone call termination detection circuit 44 detects this and returns to the standby state (step 522). Note that the operations in steps 521 and 822 are performed in step S14. This is the same as S15.

If the forwarding destination telephone answers (step 518),
The outside line response detection circuit 64 detects the response and sends the detection signal to C.
Send to PU46. In the CPU 46, a command is sent from the transfer destination response detection means 109 to the collocation switching means 102, and the language switching circuit 54 is switched to the state shown in FIG. 3(C).
step 823). As a result, the outside line call circuit 52 and the door phone call circuit 45 are connected, and a call is made between the door phone and the transfer destination telephone (step 524).

When the call ends and a call termination operation is performed on the doorphone, the doorphone call termination detection circuit 44 detects this and returns to the standby state (step 525).

As described above, in this embodiment, after automatically answering a call from the doorbell, the registered forwarding dial number is automatically dialed to call the forwarding destination telephone, and if the forwarding destination telephone answers, a call is made between the doorbell and the forwarding destination telephone. Since a communication channel is formed between the owner and the owner, the visitor can immediately communicate with the owner.

Further, since a transfer dial call is made only when a predetermined PIN number is input from the doorbell, it is possible to prevent the owner from being inconvenienced by being called by an unspecified person who has not informed him of his PIN number. Furthermore, while a transfer dial call is in progress, a hold tone is used to notify the visitor that the call is being transferred, so the visitor does not feel anxious while waiting.

FIG. 6 shows the structure of a doorbell according to another embodiment of the present invention.

A feature of this doorbell is that it is equipped with a proximity sensor 202 that detects the proximity of a visitor 201, and that a communication path switch 203 is opened and closed in response to a detection signal from this sensor. This proximity sensor 202 can be any suitable means such as an infrared sensor, and is operated by power supply from the main body of the answering machine. When this proximity sensor 202 detects the visitor 201,
When the call path switch 203 closes and the door phone call path 204 is connected to the answering machine main body, and when it is detected that the visitor has left, the call path switch 203 opens and the call path 204 is disconnected from the answering machine main body. It looks like this.

Communication path 204 is connected via bridge 205 to terminal T1. T2
is connected to this terminal T1. T2 is connected to terminals DI and D2 of the main body of the answering machine.

A speaker 207 and a microphone 208 are connected to the communication path 204 via a hands-free unit 206 . The hands-free unit 206 automatically switches input and output of audio signals between the communication path 204, the speaker 207, and the microphone 208 to enable mutual communication. Microphone 208 is connected to hands-free unit 206 via input restriction switch 209. The input regulation switch 209 is controlled by a dial circuit 210.

The dial circuit 210 is connected to the dial key 211,
The MF multiplier corresponding to the input number from the dial key 211 is applied to the gate of the transistor 213 through the resistor 212. The emitter and collector of the transistor 213 are connected between the communication path 214 via a resistor 214, and the MF multiplied signal is transmitted through the communication path 213 to the communication path 214.
Sent on 04. The dial circuit 210 is a constant current source 21
While the MF signal is being sent, the input restriction switch 209 is kept open to prohibit the input of audio signals from the microphone 208 to the communication path 204. Call path 20
The MF multiplier signal sent to No. 4 is input into the main body of the answering machine as a calling signal or a password.

The advantage of the door phone having such a structure is that the main body of the answering machine can be made simpler than the embodiment shown in FIG. That is, when a normal door phone presses the call button, a voltage higher than the specified call line voltage is supplied from the power supply circuit 40 of the answering machine main body to the call path of the door phone, and the voltage rise in this call path is detected and the call path switch is activated. is configured to close. In this configuration, the door phone call path cannot be directly connected to an outside line because the voltage is higher than the specified call path voltage. Therefore, in the main body of the answering machine, the 2-wire communication path from the doorbell is converted to 4-wire communication by the doorphone communication circuit 45,
The communication switching circuit 54 connects the four-wire communication path, and the outside line communication circuit 52 returns the four-wire communication path to two lines. On the other hand, in the doorbell shown in FIG.
Since the doorbell is opened and closed, the call path 20 of the doorbell
There is no need to apply a voltage higher than the specified voltage to the door phone 204, and therefore the door phone communication path 204 can be directly connected to an outside line. Therefore, the door phone call circuit 4 of the main body of the answering machine
5 and the outside line call circuit 52 do not require a 2-wire/4-wire conversion circuit, and the call switching circuit 54 is configured to connect on a 2-wire call path, so the number of changeover switches is reduced and the configuration of the answering machine main body is simplified. .

When using this door phone, a call from the door phone is made by pressing, for example, the "#" key on the dial key 211, and end of call is detected when the visitor leaves and the proximity sensor 202 releases the call path switch 203. A configuration can be adopted in which this is performed by the main body of the answering machine detecting this.

〔Effect of the invention〕

As explained above, according to the present invention, after answering a call from a doorbell, a pre-registered forwarding dial number is dialed, and when the forwarding destination phone answers, a call is made between the forwarding destination phone and the doorbell. Since the structure is configured so as to form a road, even when the owner is away, a visitor can call the owner and immediately convey the business to him.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an answering machine according to the present invention, FIG. 2 is a block diagram showing the main body of the answering machine according to an embodiment of the present invention, and FIG. 3 is an implementation of the answering machine of FIG. 4 is a functional block diagram showing the functions of the CPU in the embodiment of FIG. 2; FIG. 5 is an operation flowchart showing the operation of the embodiment of FIG. 2; FIG. 6 is a block configuration diagram showing the configuration of a door phone according to another embodiment of the present invention. 1...Doorphone, 2...Answering machine unit, 3.
... External line, 4,5.6... Call path, 11... Calling means, 12... Calling means, 21... Door phone call detection means, 22... Call path forming means, 23... - Transfer dial number registration means, 24... Transfer dial origination means, 25... Call path formation control means. Applicant's agent Mr. Sato

Claims (1)

[Scope of Claims] An answering machine including a doorbell and an answering machine main body connected to the doorbell and an outside line, wherein the doorbell has a calling means for making a call, and a communication path connected to the answering machine main body. and a telephone answering device for making a call through the telephone, and the main body of the answering machine has a doorphone call detection means for detecting a call from the doorphone, and a telephone call path connected to the doorphone and a telephone call path connected to the outside line. a call path forming means for forming a call path between the door phone and the outside line by connecting both call paths; a transfer dial number registration means for inputting and storing a transfer dial number; and an incoming call detection means for the door phone. transfer dialing means for transmitting the stored transfer dialing number to the outside line in response to a detection signal; and detecting a response from the transfer destination to the transfer dialing and instructing the communication path forming means to form a communication path. What is claimed is: 1. An answering machine comprising: a communication path formation control means.