JPS623555A - Interphone set - Google Patents

Abstract

PURPOSE:To prevent talking between master interphone sets from being leaked to the outside via a doorphone set by introducing a hook signal each master interphone set individually to a talking changeover circuit and placing priority to inter-room talking. CONSTITUTION:An up/down signal of each master interphone set is introduced separately to a talking changeover circuit 40, that is, through separate lines 16A, 16B, each up/down signal is processed more logically to apply changeover of the channel, that is, to apply on/off control of analog switches 19, 20 and 32. In applying inter-room talking between the master interphone sets, the handset is hooked off and a call button 31 or 61 is depressed. In this case, since the analog switches 19, 20 are kept turned off, the leakage of the inter-room call to a doorphone 80 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides at least two sets of parent intercoms and at least one
The present invention relates to an intercom device that has a set of door phones and that allows communication between the intercom devices.

(Technical background of the invention and its problems) It has at least two sets of parent interphones (one set of primary interphones and at least one set of sub-parent interphones) and at least one set of door phones, and calls are made between them. Intercom devices have already been proposed. FIG. 6 does not show a conventional example of this type of intercom device. FIG. 6 shows an example of an intercom device including one set of one parent intercom 10, one set of DI i interphone 60, and one set of door phone 80. In this device, when a call button (not shown) of the door phone 80 is pressed, a ring tone is generated from the ring tone generation circuit 11 built in the first parent intercom 10.
Amplifier (hereinafter referred to as amplifier) 12, DC cut] ndenna 13, and raw rice interphone hook switch 14
A ring tone is emitted from the main and sub parent interphone speakers 15.63 via the main and sub parent interphone speakers 15.63. When the receiver hooks up and answers this ringing tone, it operates the call switching circuit 17 via the line 16, thereby causing the power supply circuit 18 to operate.
At the same time, the analog switches 19 and 20 are turned on to form a communication path with the door phone 80. At this time,
The audio signal from the subjective intercom 10 is sent to the microphone 21
from the amplifier 22, and the hook switch 14, which is turned on when hooked up. b. The signal is transmitted to the door phone 80 via the constant current circuit 23, capacitor 24, one analog switch, amplifier 25, capacitor 26, and transformer 27.

The audio signal from the door phone 80 is transmitted through the secondary winding of the transformer 27, the capacitor 28, the analog switch 20, and the amplifier 2.
One, capacitor 30. and Futukusui・′! Di14a
The sound is transmitted to the interphone speaker 15 via the intercom speaker 15, and the sound is emitted from this.

When making a campus call between the subjective interphone 10 and the parent interphone 60, when hooked up and pressing the call button 31 or 61 provided on both, a ringing tone signal is output via the hook switch 14b or 62b. The generation circuit 11 is activated, and the analog switch 32 is turned on by the call switching circuit 17, and the amplifier 12 and capacitor 1 are turned on.
3, the speaker 63 is sounded via the hook switch 62a, or the speaker 15 is sounded via the hook switch 14a. The voice signal from the subjective interphone 100 microphone 21 reaches the constant current circuit 23 via the amplifier 22 and the hook switch 14t), and the voice signal from the microphone 64 of the sub-main interphone 60 is turned on. reaches the constant current circuit 23 via the amplifier 65 and the hook switch 62b, and is then transmitted to the speaker 15.63 via the capacitor 24, the analog switch 32, the amplifier 29, and the capacitor 30, and is sounded for C mutual communication. Do the following.

Communication between the sub-master intercom 60 and the door phone 80 is carried out in the same manner as the communication between the subjective intercom 10 and the door phone 80. , 1, that is, the circuit portion consisting of the call switch 31, microphone 21, amplifier 22, d5, and hook switch 14b of the subjective interphone '10 is replaced by the call switch 61, microphone 64, amplifier 65, and hook switch 2 of the sub-master interphone 60. It is in a parallel relationship with the circuit section consisting of the hook switch 62b, and similarly the hook switch 14
Since the hook switch 62a and the speaker 15 are in the same line as the hook switch 62a and the speaker 15, it is clear that a conversation can be made in the same manner as in the case of the conversation between the subjective intercom 10 and the door phone 80 described above.

The call switching circuit 17 has a pair of N A as shown in FIG.
R8 type flip-flop 17a consisting of N D goo 1 ~
The main component is the parent interphone 1.
When a signal of 0.60 is generated on the line 716 due to the hook-up, a set force is applied through the inverter 17b, a Q output is generated, and the analog switch 19.20 is switched on, and upon hook-up, By pressing the call switch 31.61, a reset force is applied, producing a Q output and turning on the analog switch 32.

In the conventional intercom device configured in this way, there is no communication between the subjective interphone 10 and the sub-master interphone 60.
When trying to make a call between two parent intercoms, the correct procedure is to hook up and then turn on the call switch 31.61, but the call switch 31.6
Even if you do not turn on 1 (in this case, of course, the ν ringtone does not sound), it is possible to talk if you hook up with each other.

That is, the operating state of the call switching circuit 17 is that the flip-flop 17a is in the set state, similar to when a call is made between the door phone 80 and the subjective intercom 10 in response to a call from the door phone 80 mentioned above. but,
At this time, since the communication path with the door phone 80 is active (the analog switch 19 is turned on), there is an inconvenience that the calls between the parent intercoms within the residence are leaked to the door phone outside the residence.

[Purpose of the invention]

The present invention was made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide an intercom device that prevents calls between family intercoms made within a dwelling from being leaked to a doorbell outside the dwelling. .

[Summary of the invention]

In order to achieve the above object, the intercom device of the present invention includes:
a first means for detecting that at least one of a plurality of parent interphones has hooked up; a second means for detecting that a plurality of family interphones have hooked up at the same time; and means for switching the communication path so that when the detection output is not output, both doorphone calls and indoor calls are disabled, and when the second means outputs the detection output, only indoor calls are enabled. It is characterized by:

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be described in which, in addition to one main intercom 10, one set of sub-main intercom 60 and one set of door intercom 80 are provided, and telephone calls can be made between them.

1 and 2 show one embodiment of the present invention, and in comparison with FIGS. 6 and 8, the same reference numerals indicate the same components. The feature of this device is that the hook up/down signals of each group of intercoms are transmitted separately to the call switching circuit 4 via separate lines 16A and 16B.
0 and process each up/down signal more logically to switch the communication path, that is, each analog switch 19°2
The point is that on/off control of 0.32 is performed. The hook switch 14a on the main interphone 10 side is connected to the amplifier 29 via the capacitor 30A, and the line 1
6A extends from the common connection point between the capacitor 30A and the hook switch 14a to the call switching circuit 40. The hook switch 62a on the side of the secondary intercom 60 is connected to the line 16.
B to the call switching circuit 40, and also to the amplifier 29 via the capacitor 30B. Note that the door phone 80 includes a call switch 81, a speaker 82, a microphone 83, and the like.

FIG. 2 shows a specific example of the call switching circuit 40 shown in FIG. A hook signal from the hook switch 14a of the first parent interphone 10 is guided to the first input terminals of an AND gate 42 and an OR gate 43 via a low-pass filter 41 for cutting audio signals. Deputy parent intercom 6
The hook signal from the 0 wax 1' switch 62a is similarly conducted via a low pass filter 41 to the respective second inputs of an AND gate 42 and an OR gate 43. The output of the AND gate 42 is inverted by an inverter 17b and inputted to a flip-flop (hereinafter referred to as FF) 17a as a negative input signal. The Q output terminal of the FF 17a is connected to the set input terminal via a resistor 47 and a diode 48. The glue set input end of the FF 17a is connected to the common connection point of the hook switches 14b and 62b via a resistor 46, and is also connected to the OR gate 4 via a diode 44.
It is connected to the output terminal of 3. F 'F 17 a's Q
The analog switches 19 and 20 are controlled to be turned on by the output. @Output is both hook switches 14b.

The analog switch 32 is turned on after an AND condition with the common connection point potential of 62b is obtained by an AND gate 45.

Figure 3 shows the call switching circuit 4 that converts hook signals from intercoms for each group.
This extracts and shows the part that is introduced in parallel to 0,
FIG. 4 shows an outline of the internal configuration of the call switching circuit 40.

Incidentally, FIGS. 7 and 8 correspond to the apparatus shown in FIG. 6 shown in correspondence with FIGS. 3 and 4.

Next, the operation of the apparatus shown in FIGS. 1 and 2 will be explained.

1. Door phone call A ring signal is generated from the ring signal generation circuit 11 when the call button 81 of the door phone 80 is pressed, and the ring signal is sent to the main speaker 1 via the amplifier 12 and capacitor 13 as described above.
A ring tone is generated from 5.63. I received this ringtone,
When the user hooks up and answers, as will be described in detail later, the wire supply circuit 18 is driven via the call switching circuit 40 to supply operating voltage to each part, and the doorphone call analog switch 19, 20 is turned on. Establish a doorphone communication path. The door phone call is made between the door phone 80 and the parent intercom 10 or 60 as described above (see FIG. 1).

2. Indoor call When making an indoor call between parent intercoms, hook up and press the call button 31 or 61. As a result, a ringing tone is emitted from the speaker 15.63 based on the ringing tone signal from the ringing tone signal generation circuit 11. When the other party hooks up in response to the ring tone, the call switching circuit 4
0, the analog switch 32 is turned on, the above-mentioned indoor communication path is formed, and the desired indoor communication can be carried out. In this case, since the analog switches 19 and 20 remain off, indoor calls will not be leaked to the door phone 80.

In the call switching circuit 40 (FIG. 2), when either one of the parent intercoms 10 and 60 hooks up, its input becomes L II and the output d of the AND gate 42 becomes "YES". The output d becomes "H" only when both parent intercoms are hooked down. The outputs C of the OR gate 43 are both "LII" only when hooking up, and "Hpa" otherwise.The AND gate 42 is therefore used as a means for detecting that at least one of the parent intercoms has hooked up. The OR gate 43 is used as a means for detecting that both of the parent intercoms have hooked up.

Now, as shown in FIG.
The signal on the a side is b, the signal on the output side of the inverter 17b (set input signal) is e, the set output Q is f, and the resistor 47
The signal at the connection point between and diode 48 (J, FF17a
of? Assuming that the output is h and the output signal of the AND gate 45 is i, various circuit operation states will be classified into cases 1 to 5 with reference to FIG.
The status of -i ("l-1" or "bi'") and the availability status of intercom calls and indoor calls (possible is O1 or not) will be explained in sequence.

First, case 1 is a case where all hooks are down, that is, in a standby state. In this case, a="H", C-"H"
, d = "H"t"0, so b - "H", e, I
I L II, r= “@”, g= “l’, h-
“L”i=゛L T9. In this state, analog switches 19 and 20 for intercom calls are turned on by signal f, but since G = "L" (point g is connected to diode 4
8 through e='“L negative biased by 11)
Since the power supply circuit 18 is not driven and the amplifier and doorbell power are not supplied, telephone calls cannot be made.

If the main intercom 10 is hooked up in this state (Case 2), the signal d changes from H'' to II L II, and accordingly, e becomes ``I''.
The state of 17a remains unchanged, but signal q is raised to a level II HII equal to signal f. Therefore, the power supply circuit 18 is driven, power is supplied to the amplifier and the intercom power supply, and intercom communication becomes possible.

Next, when making an indoor call, in this case, the footer is raised on the main or secondary parent intercom side, and the call button 31 or ;61 is pressed.
="L II. At this time, C=゛tdl, d=
Since it is 1″L IT, the signal changes from ゛H″ to °′L″
, FF17a is inverted, h="l-1", f
= “L” (Case 3). When the call button is released (turned off), a=changes to ``@'', and accordingly becomes i-゛H'', turning on the blog switch 32 and making it possible to make an indoor call (case 4).

Consider a case where the primary/secondary parent intercom becomes an indirect hook-up (Case 5). In this case, signal C is “l”
” to “L II. When the signal C becomes "L" level, the signal is forced to "L" regardless of the signal a.
On the other hand, at this time d = II L 11
Therefore, h = "H", f' = "L II, i
= "H" and the analog switch 32 is turned on to initiate an indoor call, and the analog switches 19 and 20 on the door phone call side are turned on to prevent the indoor call from leaking to the door phone 80.

As described above, the confidentiality function can be improved by preventing indoor calls from being leaked to the doorbell.

In the above embodiment, a case has been described in which there is one set of indoor interphones, that is, a sub-main interphone, but the present invention can be similarly applied even when there are two or more sets of sub-main interphones.

〔Effect of the invention〕

As described above, according to the present invention, the hook signals from each parent intercom are separately introduced into the call switching circuit, and by logically processing the signals, priority is given to indoor calls.
It is possible to provide an intercom device that prevents indoor calls, that is, calls between the main or sub-parent intercoms from being leaked to the outside via the doorbell, improves the confidentiality function, and can be used with greater peace of mind. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a wiring diagram showing an example of an integral part of the call switching circuit shown in Fig. 1, and Figs. 3 and 4 are Figs. 1 and 2, respectively. FIG. 5 is an explanatory diagram showing the signal levels of each part in various operating states of the circuit of FIG. 2, and FIG.
The figures are block diagrams of conventional intercom devices, Figures 7 and 8.
This figure is a wiring diagram corresponding to FIGS. 3 and 4 for explaining the configuration of the main parts in FIG. 6. DESCRIPTION OF SYMBOLS 10... Raw rice intercom, 11... Ringing signal generation circuit, 14a, 14b... Hook switch, 15...
・Speaker, 18...Power supply circuit, 19, 20°3
2... Analog switch standing, 21... Microphone, 23... Constant current circuit, 27... Transformer, 31...
...Call button, 40...Call switching circuit, 42...
AND gate, 43...OR gate, 17a...flip-flop, 60...sub-master interphone, 61...
・Call button, 63... Subinika, 62a, 62b・
・Hook switch, 64 ・Microphone, 80・
...Door phone, 81...Call button, 82...Speaker, 83...Microphone. Applicant's agent Kiyoshi Inomata Figure 3 Figure 4 Figure 7 Figure 8 Hand F)"F, '?' 2. Name of the invention Intercom device 3. Relationship with the amended case Patent applicant (307) Toshiba Corporation 4. Agent (zip code 100) September 4, 1985 (shipped) (September 24, 1985) 6. Specification and drawings subject to amendment. 7. Internal amendments

Claims (1)

[Scope of Claims] In an intercom device having at least two sets of parent intercoms and at least one set of door intercoms and communicating with each other, it is detected that at least one set of the plurality of parent intercoms has hooked up. a first means, a second means for detecting that a plurality of parent intercoms are hooked up at the same time, and when the first means does not output a detection output, both door intercom calls and indoor calls are disabled; Said second
and means for switching a communication path so that only indoor communication is possible when the means outputs a detection output.