JPS61294991A - Key telephone system - Google Patents

Abstract

PURPOSE:To reduce an occasion for call disturbance and to simplify an operation with the elimination of an additional operation in a calling ST by sending a busy tone for a calling telephone set when a called telephone set is busy, starting a timer at the same time and sending an extension call signal for the called telephone set when the timer is terminated. CONSTITUTION:As a control means, a main processor CPUm 21 and a sub processor CPUs 22 are provided and the CPUs 22 performs the transmission/ receiving of a data signal between each ST with controlling a data transmission/ receiving circuit 12 and stores the operating data received by each key telephone set ST at a variable memory RAM 23 which is used in common by the CPUm 21 and also, reads out the control data to each ST stored ad the RAM 23 by the CPUm 21 and sends it to each ST. However, each of the CPUm 21 and the CPUs 22 is equipped with the RAM 23, a fixed memory ROM 24 and the same internal memory and performs a data process and when processing, a control is performed while accessing a required data at the internal memory and the RAM 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a key telephone device having a busy call function.

[Conventional technology]

In general, key telephone devices automatically perform a busy ring when the called party's key telephone is busy;
One of these methods is used, in which the call is switched to a busy call in response to a busy call operation performed from the caller's key telephone.

[Problem that the invention seeks to solve]

However, with the former method, it is not possible for the called telephone to determine whether the content of the busy call or the content of the current call is more urgent and important, and it is difficult for the called telephone to determine whether the content of the busy call or the content of the current call is more urgent and important. However, the latter method requires an additional operation by the caller, which is cumbersome to operate, and a busy call key is provided for each button telephone. The number of parts required for the entire device increases according to the number of button telephones, which causes problems such as increased cost.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is constructed by the following means.

That is, in response to an extension ringing operation of the calling telephone, an extension ringing signal for the called telephone is sent when the called telephone is idle, and a busy tone for the calling telephone is sent when the called telephone is busy. In a pushbutton telephone device, a timer that starts at the same time as the busy tone is transmitted and is reset in response to the on-hook of the calling telephone, and a timer that stops transmitting the busy tone according to the time-up of this timer; and control means for starting transmission of an extension calling signal.

[Effect]

Therefore, if the called telephone is busy, a busy tone is sent to the calling telephone and a timer is started at the same time, and when the timer expires, an extension ringing signal for the called telephone is sent. Then, the transmission of the busy tone stops, and the caller simply remains off-hook and waits, but after a certain period of time, the caller transitions to the busy state.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 1 is a block diagram of the main unit (hereinafter referred to as KSU) 1, and an external line 2 such as a central office line or telephone line from a private branch exchange.
1 to 2n are accommodated, and these are connected to cross points such as analog switches via relay contacts dt 1 + ds 1', transformer LT, and relay contact ds-1'' (shown as a representative of external line 1°). is connected to the external line link Lc1 of the communication path switch (hereinafter referred to as -TR8) 11, where the external line links Lc1 to Len and the internal lines Li, , Li2 are connected via cross points and transformers Ttl to Ttm, One pair of call lines 3 each to key telephone (hereinafter referred to as ST) 5Tl-8Trn, which will be described later.
Each ST! ~5Tvn
are connected to the transformers T, 1-' by each pair of signal lines 41-4m.
Data transmission/reception circuit (hereinafter referred to as DSR) 12 via RSM
is connected to.

Furthermore, an incoming call detection circuit (hereinafter referred to as RDT') 13 is bridge-connected to the outside lines 21 to 2n via a capacitor C1, a resistor R1, and a contact ds-1', thereby detecting the arrival of a paging signal. Contact point d
i 1 +ds 1'+ds 1! For relays DI-1 and DS-1 having
DRV) 14 is provided, and each V-DI-1 to DI-n XDS-1 to D corresponds to the outside lines 21 to 2n.
It is designed to drive a-n individually, and TR
For the 811, the communication path switch control circuit (hereinafter referred to as TRC)
) 15 is provided so that each link I'e
It controls each cross point of +~LcLi and ~Li2 and performs exchange connections.

On the other hand, the main processor (hereinafter referred to as CPUm) serves as a control means.
) 21, and a sub-processor (hereinafter referred to as CPU5) 22
is provided, and the CPU 522 controls the DSRl 2 to transmit and receive data signals to and from each ST.
The operation data of ! is stored in the variable memory (hereinafter referred to as RAM) 23 common to the CPU m21, and the CPU m21 stores the operation data of !
l) It reads the control data for each ST stored in the RAM 23 and transmits it to each ST.

However, CPUm21 and CPU522 are each R
It is equipped with an internal memory similar to the AM 23 and fixed memory (hereinafter referred to as ROM) 24, and processes data through stored program operation that executes programs stored in these. Control is performed while accessing data to the internal memory and RAM 25.

Note that the ROM 24 stores programs and data other than those stored in the internal memory of the CPUm21, and this also restricts the operation of the CPUm21.

Therefore, the CPUm 21 responds to the detection output of the RDT 13 and the operation data based on the operation of each ST.
4 and TR811 via TRCl3, the CPU 522 and DR
812, control data is sequentially and repeatedly transmitted to each ST to control each ST's indicator light 1 display and sound display, as well as call control.

In addition, by driving the relays DI-1 to DI-n via the DRV 14, the primary winding of the transformer LT 1w LT n closes the DC loop for the external wires 21 to 2n, and sends out dial pulses. In this case, relays DS-1 to DS-n4 are driven simultaneously, and contacts ds-1'' to da-n' connect capacitors C1 to Cn1 and resistors R1 to Rn to contacts di-11. ~di
-n' in parallel for spark suppression, while the contacts ds-1'' to d a -n'' are connected to the transformer L.
High resistance resistors R,, for the secondary windings T1 to LTn.
Connect the external line link Lel"Len to the side where 41n is inserted, and the click sound accompanying the sending of dial pulse
This prevents it from being given to T as a high level.

In addition, each secondary winding of transformer LT1% LTn and transformer Tt1~Tjrnr T@t~TIHB
A power supply v1 of, for example, +5V is applied to the primary winding of the TR811 analog switch, and a power supply of, for example, +27V is applied to the neutral point of the secondary winding of the transformers Tt1 to Ttm.
while the power supply v2 of transformer Tst~Ts
The neutral point of the secondary winding of m is connected to the power supply return path, thereby performing phantom power supply of the power supply to each ST.

Figure 2 is a block diagram of Sr1, showing the primary winding neutral point of transformer TI to which 917 communication line 3 is connected, and the primary winding neutral point of transformer T2 to which signal line 4 is connected. A power supply circuit 31 is connected between the transformer T1 and the secondary winding of the transformer T1. , an inverting input of a differential amplifier (hereinafter referred to as DA) 330 is connected via a switch circuit (hereinafter referred to as SW) 32 such as an analog switch, and via a termination resistor R31 and SW34,
The non-inverting input of DA33 is connected, and the output of DA33 is
The signal is supplied to the receiver R, and is also supplied to the speaker sp via the SW 35 and the power amplifier (hereinafter referred to as PA) 36, thereby forming a receiver circuit.

In addition, the output of the transmitter T is transmitted to a preamplifier (hereinafter referred to as HA) 3
7 and transmitting level settings are applied to inputs 1 to 4 of a multiplexer (hereinafter referred to as MPX) 38 via resistors R33 to R36, each having a different resistance value, and various tone signals and dials. The output of a signal generation circuit (hereinafter referred to as TSG) 39 that generates a composite audio frequency (hereinafter referred to as MF) signal is applied to the input T of the MPX38 via a capacitor C31 and a resistor R32. The output is a transmitting amplifier (hereinafter referred to as TA) 40
) amplified by resistor R31 and transformer T1
A transmitting circuit is constructed by these components.

The output of TSG39 is also given to input B of 5W32, but when the MF multiplied signal is sent from TSG39, SW32 and SW34 select input A and
38 selects the entry cuff, an MF double signal is sent to the communication line 3 at a predetermined level via the TA 40, while the DA
At the same time, during a call, 5W32.34 selects input A, and then inputs 1 to 38 according to the transmitting level according to the call conditions. 4 is selected, the transmitted voice is treated similarly.

In addition, when sending out a tone signal for calling etc. from TSG39, 5W32.34 input B, 5W35 input A
is selected, and yrpx3B selects inputs 5 and 6, so the output of TSG 39 is given only to PA 36 and receiver R, and speaker sp rings.

On the other hand, a DR841 is connected to the secondary winding of the transformer T2, and a processor (hereinafter referred to as CPU) 42, which is almost the same as the CPUa22, transmits and receives data signals through the DR841. on,
In response to the output of a keyboard (hereinafter referred to as KB) 44 equipped with dial keys and various function keys, operation data indicating these conditions is transmitted, while the received KSU
According to control data from PL, indicator light group (hereinafter referred to as PL
) 44, Display device using character display device (hereinafter referred to as DP)
46.5W32, 34, 35, MPX38, TSG39
etc. are controlled.

In addition, a reset circuit (hereinafter referred to as R
An ES) 45 is provided, which initializes the CPU 42.

Therefore, tone signals such as an incoming external call, an incoming internal call, and a hold IF@ are sent from the speaker SP, and correspondingly, the indicator light in the PL44 lights up, while the off-hook and KB43 operations cause the KSU1 dialing by pulse signal from or MF by TSG39
A double-signal dial call is made, and depending on the other party's response, the call can be made freely using the transmitter T and the receiver R.

Note that extension calls are also made by dialing, but it is also possible to make calls using tone signals and calls using voice, as well as memory dialing using MF double signals, busy calls, and amplification of receiving calls using speaker SP. , it is equipped with various functions required as a button telephone device.

In addition, the TSG39 responds to serial data SD and clock pulse CLK from the CPU 42, while the reception output DR of the DR841 is
42 is given to the interrupt input INT, and is treated as valid only when the CPU 42 cancels the prohibition of accepting interrupt input. Operation data is transmitted.

FIG. 3 is a flowchart of steady processing by the CPUm21 of KSUl. After initialization 1101 is performed, 1 received data processing 1111 for each ST, and 1 external line in response to incoming calls from external lines 21 to 2n. Performs incoming call processing '112, and performs timeout processing (121) due to time-up of each timer configured in CPUm21.
Then, after performing the 1-hold alarm process #122, steps 111 and subsequent steps are repeated.

FIG. 4 is a flowchart of the interrupt processing by the CPUm21, which is repeated at a cycle of, for example, 5m5ec. First, a 1-dial pulse sending process 201 is performed, and then a 1-dial pulse sending process 201 is performed based on the detection output of the RDT 13. After performing incoming call detection process 202, ``extension timer process 202'' is performed.
11 and 1 pending alarm timer processing (212), and after storing the control data in the RAM 23 (221), a command is given to the CPU 522. , 'Data transmission/reception 222 with ST is performed for each of STI to STm.

FIG. 5 is a flowchart showing the details of step 111. “301 is YES”
If so, is the content of this the second digit of the first dial? Step 302 is determined, and if the result is N (NO), the first digit number is stored in memory 303, whereas step 302 is Y.
If so, is the calling ST acquiring the extension? ” 311 is checked according to the data in the memory, and if it is N, 1 other dialing processing is performed to make an outside call etc. 312 is performed, but in response to Y in step 311, the called ST is off-hook or the call is amplified. 1 Check whether the called ST is busy or not.”3
Judgment is made according to the data in 21 Yoshifumori, and this is N.
If so, the normal extension 1 call processing is 322, and the called S
The TSG 39 of the calling ST sends out an extension ringing tone signal to drive the speaker SP, and the TSG 39 of the calling ST sends out a ringing tone, which is applied to the receiver R.

On the other hand, if step 321 is Y, the busy tone is sent out from the TSG 39 of the calling ST, and the busy tone is sent to the handset R.
1 timer start ``332'' configured in 21 is carried out, and the process moves to ``341'' - processing of received data from the next ST.

FIG. 6 is a flowchart showing details of step 211, and 1 timer time up? corresponding to step 332. If #401 becomes Y, in response to step 331, one-busy tone transmission is stopped (411), and one-busy paging processing (412) is performed to send a busy tone signal from TSG 39 of the called ST. Then, the speaker SP and the handset R are driven, or only the handset R is driven. Similarly to step 322, in the calling ST, the ringing tone is sent to the handset R, and other timer/time-up processing is performed. 421.

Note that the timer restarted in step 332 is
It is reset in response to the on-hook of the calling ST.゛Figure 7 is a flowchart of steady processing by the CPU 42 on the STS side.
The interrupt input given by -INT prohibition release l602 releases the data import prohibition state, and 1 reception is completed by interrupt processing? If ``611'' is Y, perform ``-receive data processing'' 612 and check if the operation is performed manually. 〃Create transmission data for transmission data signal Ds according to Y in 621〃622
After performing this, for example, a period of 1t1 of 80m5ec has elapsed in the CPU 42 (marker Kl)? 1631, and as this becomes Y, cancel the INT prohibition again.
Step 632 is performed, and steps 611 and subsequent steps are repeated.

FIG. 8 is a flowchart showing the details of step 612. If 1701 is Y, is this content 1 transmission level data? #71
1, and depending on Y of this, MPX control〃712
and select the corresponding one among inputs 1 to 4, and step 711 is N and 1 toe/data? When '721 is Y, 'tone processing T22 stores the contents of the tone signal in the memory, and step 721 is N and fi% indicator data'? ``When 731 is Y, 1 indicator light processing〃
The indicator light control status of υPL44 is stored in the memory by T32, and step 731 is N and 1 dial data? ”74
If 1 is Y, the dial number for Shift Mori dial is stored in the memory in Ki dial processing T42, and step 741 is N and 1 display data? ``When 751 is Y, 1 display process T52 stores the display contents by pDP46 in the memory.

FIG. 9 is a flowchart of the interrupt processing by the CPU 42, in which data is exchanged with the 15DR841 through the 1-data transmission/reception process with the KSUI (811), and the shift switch H8 and KB43 are transmitted through the 1-operation detection process (812).
Checks the output of the PL44, and sends out a tone signal using the tone sending control 821 according to the contents of the memory, and turns on, blinks, or extinguishes the indicator light in the PL 44 using the same 1 indicator light control 822. , 1-dial sending control corresponding to the contents of the memory 831 sends out a 19 MF signal, and similar 1-dial sending control 832 sends out a JDP46 signal.
determine the display status of

Therefore, if the called ST is busy, a busy tone will be sent out on the calling ST side, and if it continues off-hook, the busy ring will be made after a certain time set in the timer, while the on-hook If you do this, the timer will be reset and the call will no longer be busy, and depending on the caller's will, the call will be switched to a busy call without any additional operations, and the call will be automatically activated immediately upon making the call. As long as a busy call is not made and a certain waiting time is involved, the possibility of immediately interfering with the call of the called ST is eliminated.

However, the timer may be provided separately from the CPUm 21, each signal may be sent from the KSUl instead of the TSG39, and the control means may be configured by a circuit separate from the CPUm 21. In addition, it can also be applied when a two-wire telephone is accommodated as an extension in KSU1.

In addition, the configurations in Figures 1 and 2 can be arbitrarily selected according to the situation, and in Figures 3 to 9, the steps can be replaced or replaced with other equivalent ones according to the conditions. Various modifications can be made, such as replacing them or omitting unnecessary ones.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, even if the called ST is busy, a busy call is not made immediately;
Opportunities for interfering with calls are reduced, and the calling ST does not require any additional operations, simplifying operations. It also eliminates the need for special keys, reduces the number of parts for the entire device, and reduces the number of parts for each type of food. A remarkable effect can be obtained in a button telephone device.

[Brief explanation of drawings]

The figures show embodiments of the present invention, in which Figure 1 is a block diagram of KSU, Figure 2 is a block diagram of ST, and Figures 3 to 6 are KSU block diagrams.
Flowchart of processing status by CPUm of SU, 7th
9 through 9 are flowcharts of the processing status by the ST CPU. 1...KSU (main unit), 21~2n...external line, 3,31~3m...talk line, 4,41~4m
...Signal line, 5...ST (key telephone), 1
1...TR8 (communication path switch), 12, 41.
...DSR (data transmitting and receiving circuit), 13...RD
T (incoming call detection circuit), 14...DRV (drive circuit), 21...CPUm (main processor), 22
, *-*CPU5 (sub-processor), 23, 25. ,
, , RAM (variable memory), 24---RO
M (fixed memory), 32, 34.35...SW (
switch circuit), 33...φDA (differential amplifier),
38...MPX (multiplexer), 39...
・TSG (signal generation circuit), 42...CPU (
processor), 43...ΦKB (keyboard), 4
4----PL (indicator light group), DI-1 to DI-
n rDS-1~Ds-n m a a-relay, LT
t + Ttl~Ttm+Tl1l~Tam + TI
+ T2 11 @ 1111 transformer NR31~R3
8Φ...-Resistor, H8@...Sock inch, R.
...Telephone receiver, T...Telephone transmitter, SP heat...War speaker.

Claims (1)

[Claims] In response to an extension ringing operation of the calling telephone, when the called telephone is idle, an extension ringing signal for the called telephone is sent, and when the called telephone is busy, a busy tone for the calling telephone is output. The button telephone device transmitting the busy tone includes a timer that starts simultaneously with the transmission of the busy tone and is reset in response to the on-hook of the calling telephone, and a timer that stops transmitting the busy tone when the timer times up; 1. A button telephone device comprising: control means for starting transmission of an extension calling signal.