JPS5952957A - Signal transmitting circuit for interphone - Google Patents

Abstract

PURPOSE:To make a call possible even when only one is normal among plural talking channels, by transmitting not only talking signals but also channel selecting data signals through the talking channels. CONSTITUTION:When channel selecting data is sent to a called station, the data is sent by alternately inputting signals into input terminals 6 and 8 and alternately inverting the polarities of talking channels (a) and (b). Namely, when the data is H, H is given to the terminal 6 and L is given to the terminal 8 and, when the data is L, L is given to the terminal 6 and H is given to the terminal 8. Therefore, the talking channels (a) and (b) are alternately inverted and the channel selecting data is sent. When a call is started, a talking circuit is connected with the talking channels (a) and (b) by setting an input terminal 5 to H and turning transistors Tr1 and Tr2 on and, at the same time, it is informed other offices that the talking channels (a) and (b) are used by turning transistors Tr5 and Tr6 on and setting the talking channel (a) to (-) and talking channel (b) to (+).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a signal transmission circuit for an intercom which connects a plurality of intercoms/devices to a power line and a communication line, and transmits eight station data signals and a call signal through the same communication line. Regarding.

Conventionally, 1-key transmission 1 was used for intercoms that transmitted coded channel selection data signals and call signals over the same call path.
There is no path 0j, and each signal is transmitted through a dedicated transmission path.

However, when transmitting the channel selection data signal and the call signal using dedicated transmission paths, the following problems arise. That is, if the data transmission line that transmits the channel selection data signal breaks down, there is a possibility that even if the channel that transmits the channel selection data signal is correct, it will not be possible to select a station and therefore be unable to make a call.

Also, as the distance between the neck intercom devices increases, the line resistance (') causes a potential difference in the power supply path between each device.
There is a possibility that malfunctions may occur during data transmission. The present invention does not take into account the shortcomings mentioned above, but is a 2-ton device, and by skipping the transmission of channel selection data instead of using a call signal scale on the communication path, it is possible to transmit multiple 1 ton and 1 ton.
Even one ")" in l'l is normal: by configuring it so that it can be seen in the iris fortune-telling, and by making it a rope/one-knob system for the ``turquoise (ζ) composition. The present invention will be described in detail with reference to the drawings.

FIG. 11 is a block diagram showing an intercom system including one hanger for No. 18 transmission line for Takumei's Innocouphone.

J shown in the figure: Sea urchin intercom device is Taniik -
A C consisting of ``Kame d Emperor'', 1 pero U, and a bank employee's inotaphone 31.32.
There is. The ordinary intercom 31, 32 consists of the music part 3, 3, the own station number setting switch 34, the keyboard 35, the controller 3, etc., the controller 3, 3B, 39, and the control unit U.
-Line signal sending unit, 3Φ talk switch unit/40.41.42
and communication circuit 43 and one amplifier, 45 and microphone τcoho/4
The valley interphonograph 31.32 consists of one direct bullet 1. and a function line (Ii 26) connected in parallel and 3t.

Further, FIG. 2 details a preferred embodiment 1 of the ink-phono signal/transmission 1-to-1 path of the present invention. The intercom signal transmission circuit of the present invention includes an electric/ll1i part, a transmission part, a switch part, a controller, and an electronic switching part.
It consists of a switching element and an electronic switch, that is, the power supply section 33 divides the base voltage supplied via the power supply path e, , 12 by the resistors 1(, 3, 1(1)). ; Then, manually create the 72711 circuit [J, to create the midpoint 1L1V'l, and with that as a reference, the transistor rr.

'1, the constant voltage of ■ is determined by □, and the transistor l1
lr13, 'I'I' +4 creates a constant voltage of 9, which is supplied to the 9-interchanger 2 and 31 (32).

Transistor as a switching electron for transmission +1)
r, ~ (11r, o) control the communication paths a and b depending on whether to send out tuning data to the other station (not shown) or to send out the call number 1 via the communication path 3Xb. 1.The operational amplification function as a comparator is based on the channel selection data and one word of communication between other stations.
I! It distinguishes the state of one episode by 'l'lJ, and also receives channel selection data from other stations ("P").
The transistors '1, . . . l1lr4, which serve as switching elements for opening/closing the a-child switch, are switched when the channel selection data from another station matches the local station number. Transistor T "1, T as an electronic switch
r2 is an electronic switch opening/closing switch/group element
, '1 effect is switched, the channel a for
, l) connects its own station's communication circuit (shown in the figure) with the other station's communication circuit.

Next, the operation of the No. 18 transmission circuit for an intercom according to the present invention is shown in FIGS. 2 and 3 in 1.
4 mi luck.

1 Standby state transistors Tr, % Tr, o are all OFF
As for the communication paths a and b, the resistance R1 makes the communication path a ``■'', and the resistance R2 makes the communication path ○.

Further, the output Itako 9 of the comparator U is at a logic level (the same applies hereafter) at LOW.

2. Tuning status When transmitting tuning data to the other station, input codes alternately to input terminal 6 and input terminal 8 to connect communication paths a and b.
The polarity of the signal can be alternately reversed and transmitted. That is, the data is +4.1. When OH, connect II I G to input terminal 6.
A signal of [''OW is given to the H'1 input terminal 8. Then, the transistor Tr7iON-transistor rr6 is turned on.
- Therefore, the transistor Trsk (JN-) is set to ■, and the communication path a is set to ○.

Further, when the data is LOW, a LOW signal is applied to the input terminal 6, and a signal II I Gll is applied to the input terminal 8. Then, the transistor 'I''r is turned ON-, thereby making each circuit ○, and the transistors T, r, of ON-) are turned ON, so that the communication path a is turned ▪.

In this way, the channel selection mode is set to the horizontal/lateral force type and connected to the communication path.

゛3 Call status Call VC input R (ri, input terminal -f-5f l-I I
Transistors Ill, , 14''1'2 are connected to the communication circuit (not shown) and the communication paths a- and b by transistors i'r3 and Tr4, and the trans/sub'l", r, , i"l'6f
: Turn on and set the potential of the communication path to the opposite of that during standby, that is, a.
Set ○, 1] to (D) to notify other stations that the communication path is in use.This will prevent interruptions from other stations.
2 blockades, 4, A' When the status call to Fuyuhachi ends, the termination signal is sent to input terminal 8 only, 1-11, 0.
1.1 Added as a signal. i.e. l・run/metal
p rO is ON- Therefore, communication path bl・, Ka1, U, Ji7ri Tr, o is 0N-1-Run/Suffu Tr8 is O
N- Therefore, the communication path a is used and the polarity is returned to standby.

FIG. 3 shows the waveforms of the call kii6 in the bad samurai situation, the channel selection state, the call state, and the call end state as explained above.

As you can see from this 1 bacteria, the entrance take is based on 11h from Nakatune, Kyoto, and the voltages in opposite directions (from 1) alternately reverse the polarity of the speech path. 1 craftsman'C
The level of the call signal is determined by the agility of the call path or the level of the culm that does not reverse, and is distinguished from the channel selection data.

As described above, in the present invention, the single-word transmission path 1/A is configured so that not only the call signal but also the channel selection data signal can be sent using the communication path, so even if there is no dedicated path for take transmission, This has the effect of allowing you to receive calls and telephone calls.

In addition, since the channel selection arc is balanced and transmitted, it is resistant to noise, and furthermore, the power supply section is made floating, so that the power supply path between the valley equipment and the bottom is connected to the line resistance.
Even if a phase difference occurs, it is possible to perform channel selection arc transmission without any abnormal operation.

In the present invention, since the arc signal transmission circuit is configured as described above, even if there is no dedicated path for take transmission, one channel can be connected to the same communication path.
As a result, the data of the present invention can be transmitted to an intercom device that has an extremely large number of communication channels and has one communication function. Signal (519 channels (J
Even if the loop line breaks down, there will be no problem with telephone calls, which has the effect of improving the usability of the intercom.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the intercom decoupling with the data signal communication signal transmission line 7 of the present invention, Fig. 21 is a signal transmission circuit diagram between main and ground, and Fig. 3 shows the waveform of the communication path. This is a time chart. 1.2...Intercom 3......Power supply part 4...
・・・・Contact) o-ra 5 ・・・・・・・・・Telephone circuit 6.7... ・Data transmission and 1-talk signal switch section (signal transmission circuit for intercom of the present invention) ゛1, Tr2...Tran/Sufu (-child switch) Ill r: + 1111, 4...Tran 7
Transistor (switching element for transmission) 1, t,
,R,2-... Resistance a,,1)...Call route agent Patent attorney Moriya -gB

Claims (1)

[Claims] 1. A signal transmission circuit for an intercom that connects a plurality of ink-pong devices to a power supply path and a communication path, and transmits a channel selection data signal indicating the other party's station number and a communication signal through the same communication path. a power supply unit that divides the power supply voltage supplied through the power supply path by a series resistor to create a middle level, and creates a constant voltage in the opposite direction based on the middle level; Depending on whether the other station is to send out the channel selection data or the call signal, the transmission switching element for controlling the "Φ channel" 2 and the transmission switching element can control the state of the communication channel t/J. a comparator that discriminates and receives tuning data from another station, a switching element for opening and closing a multiplex switch that is switched when the tuning data from the other station matches the own station number, and the electronic A signal transmission circuit for an intercom, characterized in that a switching element for closing the station is switched to connect a communication circuit to the communication path. 2. A balanced system for channel selection data. A signal transmission circuit for an intercom according to claim 1, which transmits a signal by using a signal.