JPS601996A - Extension hands-free circuit - 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 The present invention relates to an extension hands-free circuit in a key telephone system.

FIG. 1 shows a connection method for an extension/end-free circuit in a conventional key telephone device. In this conventional example, a hybrid amplifier]-1 speaker amplifier 2 is installed in the main device 1.
-4. Calling side button telephone 3 with speaker 2-5 installed
A circuit 1-2 that counts dial pulses of a circular line calling signal from
81, and input the output to the button telephone Ij * 2's leg turn j'i 2-3 K manually to operate the microphone 2-1, microphone amplifier 2-2, and speaker amplifier 2-4. The receiving telephone desk 2 side is configured so that a response call can be made between the microphone and the speaker with the calling terminal 3 side without lifting the handset 2-(j).

The above connection method uses a hybrid amplifier and electrical.

Connected to the telephone ring 30 is the communication circuit: 3~1° and the handset 3-2 and the microphone 2-
1. Since there are only a microphone amplifier 2-2, a speaker amplifier 2-4, and a speaker 2-5, the hybrid balance is low regardless of the number of telephones connected to the button telephone device.

However, the connection between main device 1 and telephones 2, 3, etc.
2 cores for the inner line, 2 cores for the human output line of the slave unit's speaker amplifier and microphone amplifier, and a total of 2 cores for the output line of the dividing circuit θ). Multiple core wires are required depending on the number of connected telephones. For this reason, multi-core cables are often required to connect the main equipment and the stuffing machine; however, wire-core cables require a lot of wiring work, require high parts and construction costs, and can also spoil the aesthetics of the room. There was a serious drawback.

Therefore, in order to reduce the number of core wires, a method is required in which information between the main device and the telephone is multiplexed and transmitted. If +j is the inner line of 2 cores, an extension call is made.Call Susumu, Information 1
'This is a method of multiplexing the HE power and connecting it to the branch connection, but in the conventional method of implementing it in the main device, which is a hybrid amplifier, two wires are required to connect the telephone, speaker amplifier, and microphone amplifier. Extension hands free? 1 no 1i] Ero'11 Σ Story (Near hybrid amplifier is installed and it is necessary to convert the small wire to 2 wire at telephone A; or N4. However, for the domestic political route, there is a 71 call and information.

Since the power is multiplexed, it is necessary to install a filter in each building to extract the necessary signals and install it inside the telephone.It is electrically connected to the extension line for hands-free extension. ]・It is an hybrid amplifier, but the input impedance on the first side of the hybrid amplifier cannot be made too large due to the transmission/reception loss, so/・
When you connect an hybrid amplifier, there is a problem in which the shadow of the input impedance on the inner line side of the hybrid amplifier appears on the inner line.

Furthermore, if the hybrid amplifier is installed in a multiple phone, its influence will be greatly affected, so the button telephone device 6. In some cases, the number of telephones that could be used to implement hands-free extensions was limited, and the company had the disadvantage of not being able to respond to user requests.

The present invention relates to an extension hands-free circuit b' (i) in a key telephone device connected to a small core branch, in which an hybrid amplifier installed in the extension hands-free circuit is
By providing a switching circuit to prevent internal power from being connected, the influence of the human power impedance on the inner line of the hybrid amplifier on the inner line can be minimized. The purpose of this invention is to provide an extension hands-free circuit that can be installed in as many telephones as necessary.

The present invention will now be described in detail based on the drawings below.

FIG. 2 shows an embodiment of the present invention, in which 10 is a main device.]
1 is a station arrival detection circuit that receives and detects a recurrence signal from the station line;
]2 is the sound ω11.13 is the low-pass filter (hereinafter LP
F13 and 5), 1 Lee is a general-purpose microcomputer (Fuji Oil MB8135Ul, hereinafter referred to as CPU), ia is the input/output circuit, and ■41)? l1ll 14i circuit, 14c is a memory circuit, 15 is a receiving/1B'' circuit including an FS signal demodulation circuit, 16 is a bypass filter (J2J
, lower HPF], 0), 17 (・! FS signal modulation circuit, 18 is the telegraph, 20 is the button? ratio board (hereinafter referred to as slave unit) j?a1.201 is A communication circuit including a handset, 202 is a low-pass filter (
203 is a bypass filter (hereinafter referred to as IPF 203), 204 is a receiving circuit including a 1.S signal conversion circuit, 205 is a P''S signal conversion 1tB circuit, 2()6 is a micro The computer (Fuji Oil MR8850) (hereinafter referred to as CPU) is 206
3 is an input/output circuit, 206b is a control circuit, 20 (IC is
Memory circuit % 207 is a speaker amplifier, 208 is a speaker, 209 is a switch circuit, and 210 is a station! Function buttons such as buttons, 211 is a display iB showing the use status of the office line and extension, 2L2 is a hook switch that controls on/off information g4 + circuit 2061) and an extension handsfree system i (2 hooks that send to the i circuit 104) The switch information sending circuit, 218, is the LKIJ relay that operates when the telephone line is turned on and is restored when the central office line button Lf is operated, and is located at 21 Toba' City (B). 100 is the extension hands-free circuit, 101 is the microphone, 102 103 is a microphone amplifier, 103 is a hybrid amplifier, and 104 is a microphone 1 (IF, microphone amplifier 102, 105 is the internal conflict hand-free system fdl1 circuit that outputs the control i1'i"I* number for operating each of () 5, 105 is the internal conflict hand-free system?l1
ll 1141 circuit σ) Signal is a switching circuit consisting of an analog switch ASW which turns on and off, and 2.3. Normally (in standby state deafness), ASWI, 2 is off and ASW3 is on. 106.107.108, 109
are the input/output terminals of the extension hands-free circuit, and 80 to n are the other handset terminals 2 to yJ6. n, T' (A is the handset, IkO
, Ikl, lk2 are the contacts of the LK relay, H8l,
H82 is a hook switch contact, I, T are transformers,
PaW4. ASW5 is: an analog switch that controls the human power to the speaker amplifier 207 with a signal from the li control circuit 206b, LIL2 is the station, lρρ path, Ci, C2
Hauchi Tadasu! It is a road.

First, the general operation of the present invention will be explained.

The data transmission format between the main device v10 and the child (Shio 20) will be described.In the button telephone device, the main device f*:
When transmitting and receiving information signals between the main unit 1.
0 and each slave device 20 to n need to be in a synchronized state. M
Figure '58 shows the transmission mode and synchronization method of the information signal of this embodiment, which will be explained below. It transmits the synchronization signal shown in (2) to the handset 20-q], receives the synchronization signal (20-1), and becomes the same JIJi and IRrsD as the main device IO.

Next, at the timing of H2, the main device】0 is all children 4++zo
~11, send the main device information, and after T30)
At the timing, the first child &20 sends the slave device information ¥K to the main device 10, and at the timing of H4, the second slave device information is transmitted, and at the timing of 111th PeT n + 2, 1
] When the child of the number 1 sends an emotional message and the transmission of the child 4n of the last number ++i% is completed, the main device 10 sends a synchronization signal to all the child devices 20 to n, and from then on repeats to the child of the same rank. No return. Also,
The same Jυ1 signal format is as shown by 121 in Figure 3, whether it is the main unit 10 or all slave units 20~! ] with n consecutive hits.
After sending the I information + Ej, the low signal is depressed] υ (as if it were to be transmitted after closing the bit) (1 [T was created.

(In the evening, = 20-11 side counted these consecutive /・A signals and played them more than a certain number of times) First, σ) low signal is set to 1idN='L, the timing is corrected to 1b, and synchronization is established.In addition, the main unit 20-11 is the main unit] In order to acknowledge the synchronization signal from 611. Machine σ) Even when sending, ii! 1'+11- signals are linked. Therefore, for synchronization from the main H station 10, the
gh I:,+i′ is different from other σ）information■ζIgi, which does not occur even if all possible states of good are put together ℃・
It will be a consecutive number)(igh(8).

The 916 circuit σ used for the above data transmission
There is No. 23.

<Office Dispute - Answer J5 - End of Call> Next, the incoming call response operation of the office line (・To explain,
- When the θ) ejection signal arrives from the station at LL2, the θ) signal turns on the detection circuit 11σ) of the main device 1t10 and turns on the photocoupler PC. Photocoupler PCθ)ON
The value is CPU14σ) - via the input/output circuit 143? l
i control circuit 141) requires human power.

In the control tw+vil, input/output circuits i+a, Fs(H change 1jiJ times bl15, I(P
F16 is traced to inner M 16 ClC2, and the sound stops and is outputted, and the station line width (i information is transmitted for all military stories. At the same time, !fill side 1 time + 1! 314.b
Ef ij! X 12] j,
M l/? t12 & the LPF 13 is j11↓ and the station line information signal is sent to each child unit via the inner line CI C2. The control circuit of each slave unit receives the notification of an incoming station dispute call from the main unit 10 via the internal dispute route ClC2, and returns the original signal F1? Shikisukosho iJ '3 Jtteno (nofu) - and Tato ICi: childea, c, ]a) system (
+lll 1Ljl 1'620 (31) 1h bu 3
, ;? - A signal is output from θ0 that causes the speaker amplifier to move, and the ASW4 is switched to the main AS.
\・'J5 with Mefu. ηi control circuit 2 (H3b
Output boat 01 force) bs rU front A no l'7
1 No signal crab 1-νj that turns off the No circuit 100
ul Iξ envelope 2 capacitors, inside #/・nd free circuit 100σ) through V111'1 child 108/・nt free system (+r41 to circuit 104)C.

Open side 1 circuit 2061) to 7 A signal power
, extension line/end-free control circuit 104/ba, microphone 1
．． 01. , "Sends a low signal to the amplifier 102 and changes the operation to j!ill f+lif L, 9J [1 path 10
Low signal to 5 causes ASWI, ASW'Z to 71-
) and the samurai JIJI oath that turns on ASW3 is held)
T-ro. 1-13 from the syllable 12 of the main outfit 10
14 (Main & IC) Trace C2 and enter it in child 4.
Ken C], C2-LPF202- l k o -1k
+ Nok” and -l-H5l Flake contact-
1 to 2 meters hypothetical point - trans LT -VA hA no. free ti==l road prostitute 10G] σ7) through W valley ゛[
crystallographic urine)・ndoff.

Lee circuit 1oo's I + item 100 has a person bus J A. 1
In the 71-wire node-free circuit 100, the normal state 1 is
&ma cut 41.05σ) Since ASWl and ASW'2 are set to off and ASV/3 is set to on, the central office line ring tone is A.
The signal passes through SW3 and is output from terminal 107, and further passes through ASW4, is input to speaker amplifier 207, and is output from speaker 208. Also, Kaneko (J Sun system (11)
The 41 circuit outputs a blinking signal of the office line lamp to each display section, and a blinking display of the office line call is made. arbitrary σ) slave unit (e.g. slave unit,
/161), press the function button 21 on the handset HA.
When you press 0 (station line button), the LK relay is restored and -1
k o , l k l contacts Spietsno 2'08
Tonouma (*The sound transmission route is cut off, the station ringing stops, and the station line LIL2 is connected to the 'J!! i talk circuit 201, and it is now possible to make a call. At the same time, the station line response information is input and output. The signal is inputted to the open side j circuit 20t3b via the circuit 1 20t3a, and the 1ljllf111 circuit 206b inputs the station line response information to the control 'f11 circuit 14b via the input/output circuit 14-a of Doseiji1.0. I received the response information] Senj times h゛each 14. l) Is this the incoming call information that was being output to the handset? 1d transmission is stopped and a station line lamp lighting signal is output. Each child's e's i! lighting signal was manually powered! On the first floor of the i control circuit, the local rung blinking signal that had been output to the display section is changed to a lit signal, and the local line lamp on the display section is turned on. When the call ends and the handset is hung up, the office line lamp on the display goes out and the handset returns to standby mode.

Furthermore, in the handset in which the internal hands-free circuit is not implemented, the giT1i terminals 106 and 107 of the internal hands-free circuit are short-circuited, so the sending of the calling signal from the supino 1 is controlled only by the control ``1'' of the ASW 4. Other operations are the same as the other models, which are equipped with a one-screen hands-free circuit.

<Extension - simultaneous 1 ringing> Next, I will explain the operation of calling all extensions at once.

The analogy is a child? Sr, 4 other children from l! When you want to make a 1゛Y call, press the function button 210] If you lift the handset HAk without z, the communication circuit 201 will receive the following message: ゛[Inner line■1ttll -L;PF 202-1 k O-
Call times t% 201-1-IS+-1+-LPI・
202-inner line θ side], the call current flows, and the extension is captured at 17%.Here, operate the extension-intermediate call (for example, press dial 0 of switch circuit 209).
When this is done, the control circuit 206b detects this)-11'g
As a notification signal, the sub circuit 205 sends the signal to the main device 10 through the HPF 203, and outputs the signal to the main device 10.
Hl)Fl (3. When the receiving circuit 15 is followed and a simultaneous 1 ringing signal is received, the extension blue ringing information and internal conflict lamp blinking information are transmitted to all handsets. ?l1ll ?The wholesale circuit 14b outputs an internal ringing tone sending signal to the Jingen 12, and sends an internal conflict ringing tone to each handset from the sound m and 12.Extends 0゛ and receives the information. The control circuit for each pre-phase outputs power to operate the speaker amplifier, and at the same time outputs a blinking signal for the extension lamp to the display section to blink the built-in lamp. Internal conflict following LPF13 C1, C2
It is superimposed on the slave unit, extracted from the LPF 202 at 1 μm 1, passed through the path of (II<o-) Lance LT-1 2- H8I-1 +), and sent to the secondary side of the transformer LT = 4, and then connected to the speaker amplifier. K, J: ') nj 'l'i,
"1" and a 7tA high sound is sent out from the speaker 208.

For Jungo Nauchi - Outcall - dial 4111j, while it is dialed, it will be a tone/call, and the dial will be switched to νiii + zuto voice 1'' sound output so that the voice input from the handset will be sent out from Spinono ( It is made up of 11 yen.

In this state, if you lift the handset with any handset.

The hook switch voice is connected, the call circuit is connected, and the call continues, resulting in an extension call and an internal call call. In addition, the hook switch merciless sending circuit allows the child to reach 4t.
l<: The CPU detects the internal drawer ry', and the main device CP
Send information to U14. The CPU of the main device received this and stopped the extension illumination, 'M m, 1
2, and sends extension lamp lighting information to all slave units. The CPU of all children Iν receives this and outputs Gt to the display section in order to light up the extension lamp.

When the call ends and the handset is taken down, the hook switch cuts off the ``a1 navy blue 1 circuit v); The machine C)U detects this and turns on the main device CP'U14.
In response to this, 7 shi] loading rung σ)〆1〕 for all slave units
After transmitting the tang 1il, the CPU in the child comfort outputs a signal to the display section to turn off the inner j-line pump. As a result of the above, he becomes Ext. Samurai M-shaped Bodhisattva.

<Individual UF Output for Internal Conflicts> Next, I will explain the main point of the hon.

The child/IG, 2 is the calling handset that makes the call, and the handset j
6"1 is an internal hands-free circuit 1 (30 is implemented and individually; when a call is received, the internal hands-free circuit 1) is connected to the slave unit 11'l' which can answer L6. It was originally designated as Naihisa.

In order to issue an individual extension tl'p, the child (τ temple 2's handset (not shown,
As in the first work, current flows through the trace circuit and the extension is captured. Here, if you dial number H4f, which corresponds to child 4 cusp Al, using switch Naka 1 route 209, child output information will be obtained from child unit 30's CI) U, FS pulse modulation circuit, and HPF (none of which are shown). and sends it to the inner line ClC2,
The HTJF 1.6 of the main device 10 controls the receiving circuit 15 and is manually controlled by the control circuit 1.11 of the CPU 14 [4.1]. CPU14! till supine b-614b (
1. 6 for the Y output information, the open side j circuit 20 of slave unit Al
6! ] and sends out an individual iQ-output signal (including an extension lamp blinking signal) to the Shin section 12, and outputs an extension ejection chopstick sendout signal to the Shin section 12. Jin QI7 (12 sends uq-output signal to inner A urinary tract CI C2 via LPI"13.
51 receiving circuit 204 demodulates the signal into the original σ) signal 51N formula and manually inputs it to the CPU 20fi, Ill 4 times 1+W2
O6b receives the hook-on information from the hook switch 悄+'19 sending time i-烙212 (B Shibuko J), and output boat 0.
1. Change the current signal to the low signal and activate the extension hand-free circuit 1.00.At the same time, output the ``ihaku'' from the output port 00 and use ASVI.
Speaker amplifier 20 with /4 on and ASW5 off
Operate 7. Also, send a blinking signal for the extension lamp to the display unit 2]1 from the output boat θ2 to make the inner lamp blink. The extension free system f1141 circuit IU4, in which the operation signal is manually input, sends out a control signal to turn off the microphone O1, the microphone amplifier 102, and the ASWI-ASW2 of the switching circuit 105, and to turn off the ASWI-ASW3 of the switching circuit 105. Ma, cum 10 through no-brid amplifier 103
1, the extension number for making a call is set to +8. Meanwhile the main gt'a: 10 Takehara 1
2 Yosu LPI” Follow 13 and inside il&i N'f+ C
The exhaust line discharge sound superimposed on the IC2 is extracted from the LPF 202 of the handset 20 (II<o-2H81-1k to the transformer LT-1]).
i-mail /S L'f",) 2 /X1 shell 11
12, [Transformer LT-Extension hands-free circuit 1/1lii child 1.06-ASWI-Hybrid A
MP103-ASW2 one terminal 1.07-AS~V4. −
Speaker amplifier 20 speaker amplifier 20) 3'J's line 1I71 causes the speaker 208 to output the extension line and Y-output line.

By the above route, 3b Yobukomasu, Tora 2 and Ha Ikokozakura, Ochi 1
This means that the I+f+ divination route of lH+ with → has been concubined. Please answer the handset into the microphone 101.
The voice is [inside Ii is hands free circuit 1. OU microphone 1 (
11 - Microphone amplifier 102 - High frit amplifier 1 (1
3-September 4 (i times bj (+ 1.05 y) A3w1゜'i) j child↓00-trans 1. 3 make points on T-1] S1 break contact -11 (O・11\1 make contact -LP 11゛Y-子TO';
, jjo, 2 f, extracted by the child (÷ LI in Vega 62) F (not shown) and sent to the handset (not shown) as each tone 'l L'. Through the above route, a call is made from the handset and receiver of 1 slave unit & 2, the microphone 101 of 1 slave unit, the speaker 208 and θ)
An extension hands-free call is made between the two. Also, display section 2
The extension lamp of 10 continues to blink and the hand 7IJ -
') ri + speech fluency, ki, this).

If you respond by raising the transmitter/speaker by -1 when the child's device j = 1, the hook switch
．． 2 more funk switch off signal power 'VITi child 109
facing the extension hands-free control circuit 104,
1 time of life at lr1 time h! 1i206b is also input and the extension hand-free line IW5 from the control f wholesale circuit 206t)
The output to yiAi child 10 and 3 changes from low 4iTi to noi signal. Extension hands free + mg + circuit 1
The output of 04. is also low every -, and the output of microphone 101. ,, microphone amplifier 102 and ASWI, ASW 2 are turned off, ASW 3 is turned on... and free Tsukino is 1.1
″・Stop.Also?1ill (Wholesale circuit 20 C+ 1.
+ is the main device I″, 1.]() flill 11111
Circuit 141) Vrc vs. shite also sends 77 Kusuinochio off information, main ≠ 11'' question (11i11 side of 1 once 1 time)
,4. Stop the internal roaring message that was being output from b to user 12, and change the extension information to each slave unit to 7-- (counter information. As a result of the action, the child digit, the child digit, and the cup 2 use the handset and receiver to make an extension call, and the extension lamp on the display section lights up completely.

In addition, in the above-mentioned implementation 1/1j, switching time i1. i'r10
Although the present invention is constructed using the analog switch No. 5, it is not limited to this; it goes without saying that other switch means (for example, relays, etc.) may be used.

As is clear from the above explanation, the extension hands-free circuit of the present application responds to each input condition according to the input status of the central office line incoming signal, common-call-all paging signal, individual extension paging signal, and hook switch on/off signal. an internal hands-free control circuit that outputs a control output, and a microphone, a microphone amplifier, and a hybrid amplifier that operate based on the output signal from the internal hands-free control circuit.

The input/output circuit on the inner line side of the hybrid amplifier and the output line of the speaker terminal 1 are each provided with a switch means.1. A switching circuit is provided in which the microphone, microphone amplifier, and switch means of the switching circuit are operated and switched only when the signal manually inputted to the open side circuit is inputted with the hook-on subdivision and the extension individual calling signal, thereby preventing internal dispute calls. A call is made by connecting the input signal to the hybrid amplifier, and the input signal is connected to the hybrid amplifier.
The switching circuit is set up so that the hybrid amplifier and the extension communication line are connected only to the telephone that receives one call from each extension, and moreover, the switching circuit is configured such that This is a circuit configuration in which the influence of the human input impedance of the hybrid amplifier on the inner line can be reduced.

As explained above, according to the present invention, a switching circuit is provided so that the hybrid amplifier provided in the inner line and the inner line is not electrically connected to the inner line at all times.
+5 is controlled according to the calling state, so the influence of the human input impedance on the inner line side of the hybrid amplifier on the inner line can be minimized.
Even when applied to an extension hands-free circuit in a η1 telephone device connected to a core branch, there is little effect on the extension line, and furthermore, it has the excellent advantage that the extension hands-free circuit can be implemented in any number of telephone devices.

[Brief explanation of the drawing]

Figure 1 is a connection diagram of a conventional extension free circuit, Figure 2
FIG. 3 is a circuit diagram showing an embodiment of the present invention, FIG. 3 is a time chart for explaining signal transmission according to the present invention, and FIG. 4 is a flow chart showing the non-end free lh operation. lO°°゛・Main device, 11...° Station gradual detection circuit, 1
2...-¥rm, 13...LPF,-
14...Microcomputer, 15.°°...
Receiving circuit, 16...HPF, l? 2...F
S signal modulation circuit, 18...power supply, 20...
Telephone A l, 201... Call circuit, 20
2...LPF, 203...-...) iPF%
204...Reception circuit, 2'05...F
'S signal change. 1 circuit, 206...Microcomputer, 207...Speaker amplifier, 20
8...Speaker, 209...Switch circuit, 210...Function button, 2.1]...
・Display tJ, 21.2...Hook switch 16
Information transmission circuit, 21:3...LK relay, 211
L...g dt, 100...inner form A no. free times j'i"2.101...microphone, 1
02...Microphone amplifier, 103...Hybrid amplifier, 104...Inner phase hands-free side tilt j circuit, 105...Switching circuit, 106-10
9...Person output W: ij child. □17 Leh A□ Figure S

Claims (1)

[Claims] A button telephone device V in which a plurality of button telephones 9 are branch-connected. - In the 7 extension hands-free circuits in the office, there is a microphone, an amplifier that increases the output of the microphone, 1 extension hands-free opening circuit that sends out a signal when a control signal or manual input is made, and the internal hands-free control. A switch means operated by a signal from the circuit and rjit addition 1
It is composed of a hybrid circuit that combines the output from the lli, il device and the receiver's power inputted through the switch means b1, The switch means is operated only when the call signal is received, and the call signal is connected by tracing the hybrid circuit.
'iV, internal conflict hunt-free circuit.