JPS59181761A - Interphone device - Google Patents

Abstract

PURPOSE:To control a voice receiving level of an indoor part of a transmitterreceiver type by the time of an indoor call and the time of a call between loudspeaker type outdoor devices, by constituting a wiring between indoor devices of two wires, superposing a voice onto a power source feed line from a master machine, and also transmitting and receiving an address signal for an inter-call of the indoor device, and a transmitter-receiver state signal, etc., by a pulse modulating system using a carrier wave. CONSTITUTION:A filter FL for transmitting and receiving each input signal mentioned below by using a carrier wave and an input/output transformer IT are connected to a voice line (l). Also, transmission and reception of these signals are executed by a transmission and reception controlling circuit SR. When another indoor device picks up a transmitter-receiver in accordance with a call of a doorphone, and a call is executed to the doorphone, other station which is not in a call state to the doorphone becomes a privacy since an attenuator ATT is in an on-state. In case the person himself hook up the transmitter-receiver, the own station transmits a hook-up signal to other station from a hook switch FS, but the own station does not turn on the attenuator ATT, and a call to the doorphone can be executed. In case other station executes an indoor call by a hook-up, when a call address coincides with a self-address, the attenuator ATT is turned off, a chime circuit CM is operated, and a ring-back tone is loudened to its own loudspeaker SP.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to an improvement in a base unit/subbase unit type intercom device that allows communication between the base unit and subbase unit, that is, between indoor type intercom devices. This realizes a reduction in the number of wires.

(Backbone of the invention) A conventional device of this type is shown in FIG. I configuration is known. In Figure 1, M is the main unit, SM (
SM 1. SM 2) is a sub-parent, [) is a surprise device used as a doorbell at the entrance, etc. Usually, the indoor unit (
That is, the base unit M and the sub-base unit SM communicate with each other simultaneously using a handset, and the outdoor unit communicates with the indoor units M and SM using a loudspeaker system. The wiring between each hollow unit M and SM is 4 lines a, b, c, and d.
It's done on a line. Line a is a power supply line, and the main unit M receives power from the commercial power supply to obtain the desired direct current or connect a battery, and then connects each sub-main unit S via this power supply line a.
Power is being supplied to M. The line is an address signal line for making individual calls between all the indoor units M and SM+11, and when an at1nos signal is output from any indoor unit M or SM to the line, each indoor unit M , SM receives the signal, compares it with its own address, and generates a ring tone when it matches. The line C is a common communication path between all internal units M, S, and M, and the line d is a common line between lines a to C. All external components are connected to the parent 11M using two wires e and f.

In this conventional intercom device, each internal unit M,
Since individual calls between SMs are made using dedicated lines and digital code processing, a significant reduction in wires was achieved compared to the previous system in which call lines were provided between each indoor unit. It still requires 4 wires, and these 4
Since the wires have polarity, each wire must be connected to a predetermined location, which has the disadvantage of complicating construction work. In addition, the address signal line is independent from the voice line C, and when there is an individual call from either indoor unit M or SM during an air call between all external units and indoor unit M or SM, an 8-call call is made to the outside. There was a risk that this would be hindered.

(Object of the invention) The present invention has been made in order to eliminate the above-mentioned drawbacks.
The main unit/sub-base unit type intercom, which can talk to each other and make individual calls, saves wires and simplifies wiring work. An intercom device (j
It is intended to serve the public.

(Summary of the Invention) The present invention uses two wires for wiring between indoor units, prevents audio from being connected to the power supply line from parent 1; etc. are transmitted and received by a pulse modulation method using a carrier wave, and the voice reception level of the handset-type indoor unit is controlled during a blank call and when a call is made between the loudspeaker type outdoor units.

(Description of Examples) FIG. 2 shows an example of the present invention. Indoor unit J Nawara main unit M
The wiring between the and the new f(ISM (SM 1. SM 2)) is performed by a two-wire non-polar line!1.

D (D, 1 , D2 ) are amplified all-external units, such as door phones, and are connected to the base unit M via lines j2 and i3, respectively.

FIG. 3 is a diagram of the basic audio path of the present invention. The indoor units M, sM, and door phone D are each connected to a common audio line J, and the transmission and reception are separated by a hybrid transformer HT.

Moreover, the audio line j is also a power supply line from the main unit M to the sub-main unit SM and the door phone D, and the inductor L as an audio filter for the audio signal is connected to the indoor unit M.
, SM, and the space between these inductors L serves as an audio line.

The main unit M and the sub-main unit SM have the same configuration except that the main unit M is provided with an intercom selection circuit, an intercom loudspeaker circuit, a power supply circuit, and the like.

The speech transmission circuits of these indoor units M and SM include a microphone MIC and an amplifier AMP, and the audio input from the microphone MIC is amplified by the amplifier AMP and sent to the audio mJ via the hybrid transformer HT.

The receiving circuit also includes a speaker SP, and causes the speaker SP to sound via the hybrid transformer 1-IT in response to an audio signal sent from another communication device to the audio line j. When talking between indoor units M and SM and door phone D, indoor units M and 'SM are handset-receiver type and door phone D is amplified type, so the audio signals sent from indoor units EM and SM are sent directly to the speaker of door phone D. It must be at the level (usually about +10 dB) that drives the SP and amplifies the sound. On the other hand, since the indoor units M and SM are handset-receivers and receive calls by answering the LS, the level of the IM signal sent from the door phone D to the indoor units M and SM may be lower than the above-mentioned level. Usually about -20 to -30 dB is sufficient. but,
When a call is made between indoor unit M and 5fv1 at the above-mentioned transmission level, a non-1 level is heard from the speaker of the handset.
A loud amplified voice was emitted at 'A°, making it impossible to make normal calls. Therefore, it is necessary to provide an attenuator ATT in the receiving circuit, and to set the attenuator ATT to a desired reception level by not operating it during calls outside the dormitory and operating the attenuator ATT during calls within the dormitory. Furthermore, since it is possible that one of the indoor units M, SM may be speaking alVi to the other indoor units M, SM while talking with all the external units, it is necessary to prevent this.

Figure 4 shows a block diagram of the revised 1m SM taking these into account. Referring to Figure 4, when the handset is connected, the hook switch FS normally
VNc is disconnected, the input of the amplifier AMP is connected to the chime circuit CM, and the output of the amplifier circuit AMP is connected to its own speaker SP via another hook switch FS. As a result, the individual buzzing sounds and ping-bong sounds in response to indoor calls and doorbell calls from the chime circuit CM are sounded by the speaker SP via the amplifier AMP.

Furthermore, an attenuator ATT is connected upstream of the speaker SP.

A filter F and input/output 1 to Lance IT are connected to the audio line for transmitting and receiving the following input signals using carrier waves. Further, transmission and reception of these signals is performed by a transmission and reception control circuit SR. The input signals of this transmission/reception control circuit SR include (a) self address, (b) called address, (C) self hookup, (d) self hookdown, (e) other device hookup, <f), etc. (a) There is a doorbell call, and the transmission/reception control circuit SR controls the chime circuit CM and the attenuator ATT in response to these signals.

Next, the control of the attenuator ATT and the frame circuit CM performed by the transmission/reception control circuit SR in response to these signals will be described. FIG. 5 shows the generation states of each signal and the controlled states of the attenuators A, T, J: and CH/IM circuits CM.

In the same figure, "1" is a signal present state, "O"
is the state with no signal.

In addition, the attenuator ATT attenuates the IHA month with "1",
'', the circuit is short-circuited. In the diVim circuit CM, "'1'' is the chime sound generation state, and "0" is the operation stop state f8i.

State (1) indicates the standby state. In this state (1), all signals are off (the attenuator ATT is off (short-circuited state) and no chime sound is output.

In state (2), when some other station picks up the handset and sends a hook-up signal to the line, in response, the attenuator ATT attenuates the on-Nu signal. This state (
2) is when one of the other stations picks up the handset and is talking to the doorphone in response to the removal of the doorphone.
Since it is in the on state, it becomes a secret story (state (4)). Next, if you pick up the handset from state (1), state (3)
), and the local station transmits a footer-up signal from the hook switch FS to the other station, but the local station does not turn on the attenuator ATT, and it becomes possible to talk to the doorbell.

Status (5) is an indoor call, and when another station hooks up and makes an indoor call, if the address does not match the own address,
This is the same as state (1). In state (6), when the calling address matches the own address, the attenuator ATT is turned off and the chime circuit CM is operated to amplify the ringing tone to the own speaker SP.

Next, state (7) is when calling another station indoors, and by hooking up from state (1), state (3) GC
Then, the attenuator ATT is turned on by the room call button, and the state shifts to state (7). State (8) is when the other station hooks down earlier than the local station during an intra-campus call, and the attenuator ATT is not controlled and the previous state is maintained. Furthermore, even if another station erroneously activates the handset during a remote call, the attenuator ATT is not controlled depending on the hookup state of the own station. Return to standby state (1) Sera 1 ~ When another station hooks town first, your own station is hooked down, and your own station is hooked down! When ff1l is present, it is performed by a hook-down signal from another station.

FIG. 6 is a block diagram of the main unit M. The configuration is almost the same as the sub-base unit SM, but multiple loudspeaker door phones D are connected to the main IM, and the functions of the base unit and μ are used to select calls from the door phone, memorize during indoor calls, and communicate with students on campus. Adds the ability to disconnect the doorbell when making calls. It also has the function of transmitting a calling signal to other stations in response to a doorphone call and amplifying the doorphone ringing sound at the other station. In FIG. 6, DS is a door-bon selection switch, and DM is a door-bon selection storage circuit.

FIG. 7 shows a block diagram of the transmission/reception control circuit SR of the submaster unit SM. 1 is a transmitting/receiving remote control unit, which is an IC manufactured by Supertex (E).
D-9 is used. This transmitting/receiving control IC (ED-
9>1 has the functions of both a transmitter and a receiver, and the voltage level applied to the T/R" terminal of the IC by the transmission/reception switching of the transmission/reception mode switching circuit 2, "1-1", "1-'
'' is controlled by switching. Normally, it is in reception mode, and at the same time the data input from the reception section 9 is taken into the SDI terminal, the self address is read from the terminals D1 to D11, and it is determined whether it matches the received address. When they match, H'' is output to the terminal D/DO, and the chime IC of the chime section 12 is made to output a ringing tone via the data processing section 8. In addition, data imported from the SDI terminal such as footer up, hook town, and doorbell signals can be sent directly to the SDI terminal.
The signal is output to DO, and then to the ATT control section 13 and chime section 12. A self-hookup state signal is input to the AT, T control unit 13, which controls the attenuator ATT sent to the sub-base unit SM or base unit M. In order to prohibit the input of SDI, a processing inhibition circuit 11 is provided to control the input of the SDI terminal.

The inputs to the transmission mode switching circuit 2 include outputs from the destination address setting unit 7 and the hook-down/up signal generation circuit 14, and when these outputs are input, the transmission mode switching circuit 2 outputs a transmission start signal. Then, the transmitting/receiving remote controller 1 is placed in the transmitting mode. The transmitting/receiving remote control unit 1 reads the address of the sender into the terminals D1 to D11 in the transmission Ai Otsu 7-1~, and at the same time reads the data of HOOK TOWN, HOOK) 7 into the terminals D12 and D13.

For indoor calling, if you set a calling address and enter transmission mode, hook up.

Data selection circuit 4 so as not to send a hook-down signal
Controlled by In the case of IC, hookup, and hookdown signal transmission, the addresses to terminals D1 to D11 are all set to "o" so that the signals are sent to other stations immediately.

The transmission signal is serially outputted from the terminal D/Do, sent to the transmission section 10, and sent out to the audio path J using a carrier wave. Once the transmission is finished, the transmission mode switching unit 2 is switched from the DR8 terminal.
A signal is output to switch the receiver to receive mode. In Figure 70, the solid line ゛-''' is the flow of data, and the broken line ゛...''
is the flow of control signals. Figure 8.9 shows the seventh
This is an example of a concrete version of the diagram.

FIG. 10 shows an example of transmitted and received data. When there are 6 indoor units, 5 bits are required for the address (parent+iM is fixed), and 4 bits are used for data, and each bit has information.

(Effects of the Invention) As described in detail above, the present invention has the advantage that individual discharge and individual communication are possible with two-wire wiring, and that wiring work can be simplified. Furthermore, by transmitting and receiving the hook-down signal, hook-up signal, and indoor call by pulse modulation using carrier waves, there is an advantage that the reception level can be switched during indoor calls and outdoor calls, and a good call can be made. −

[Brief explanation of the drawing]

1 is a block connection diagram of a conventional intercom device, FIG. 2 is a block connection diagram of an intercom device according to an embodiment of the present invention, and FIG. 3 is a basic audio circuit diagram of the intercom device of FIG. Fig. 4 is a block circuit diagram of the sub-base unit in the intercom device shown in Fig. 2, Fig. 5 is an explanatory diagram of the control state of the attenuator and chime circuit in the intercom device shown in Fig. Fig. 7 is a block circuit diagram of the main unit in the intercom device, Fig. 4 is a block connection diagram of the sub-main unit control unit in Fig. 4, and Figs. FIG. 10 is a detailed circuit diagram showing an example of the control unit of the sub-master unit and the master unit, and FIG. . M...Main unit, SM...Sub-base unit, D...External device, No.
...Audio line 1.11...Common line (power feed line), SR
...Transmission/reception control circuit, AT T...attenuator. Patent Applicant Toshiba Electric Power Co., Ltd. Agent Patent Attorney Tatsuo Ito Agent Patent Attorney Tetsuya Ito Ward Ward N Law 沫Σ 331- = 5! 2 Sy2 gyu 8

Claims (1)

[Claims] 1. In an intercom device that connects multiple transmitting/receiving type intercoms and loudspeaker type intercoms to a common two wires and can make simultaneous calls, one main unit supplies power to the other intercoms and also transmits audio to the power line. In addition, a call signal by pulse modulation, a signal accompanying a change in the state of the handset, etc. are communicated using a carrier wave, and a handset-to-receiver type intercom is used to communicate between handsets. An intercom device characterized in that the reception level is switched during a call between a loudspeaker and a loudspeaker.