JPS60117894A - Private branch exchange - Google Patents

Abstract

PURPOSE:To connect an incoming call from a telephone set at the outside of a premisese to a desired extension telephone set even if the operator is absent by requesting the transmission of a desired extension number signal to a caller at incoming and connecting automatically an external line to the extension with the extension number signal from the telephone set at the outside of premises. CONSTITUTION:When the operator is absent and the mode is brought into the automatic state while a key 7 is depressed, a control circuit 26 changes over a switch 3 through a contact 7' so as to connect an external line 11 to a line 13. Moreover, a master telephone set 8 becomes one of extension telephone sets. When an incoming call from a telephone set 1 at the outside of premises exists in this state, a 16Hz reception circuit 22 responds to it, a dial request circuit 23 is activated, the voice stored in advance, e.g., ''please dial the extension number.'' is transmitted to the telephone set 1. When a caller dials the extension number in response to this request, a dial pulse wave signal is transmitted from the telephone set 1, it is discriminated by a discriminating circuit 25 via the external line 11, the switch 3, the line 13, the 16Hz reception circuit 22 and a wave shaping circuit 24, and the connecting circuit 6 is connected to the extension telephone set corresponding to the dial pulse number.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a private branch exchange that connects an outside line to which an off-premises telephone is connected to any of the extensions to which an extension telephone is connected for incoming and outgoing calls.

[Prior art]

When installing a conventional private branch exchange in a dormitory for singles, for example, a main phone is installed in the manager's room and an extension phone is installed in each dormitory room. Incoming calls are switched to the main phone by operating the phone key, etc. to the extension phone.

The above switching operation can be performed while the manager is in the room, but when the manager is out or at night, the manager cannot answer calls, making it impossible to receive calls from outside lines. For this reason, there is a problem in that it is necessary to set a time limit for one normal call reception. Furthermore, even if the manager is in the room, there is a problem in that if the manager is busy with the switching operation, other tasks will be hindered.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances.

Even if the operator is absent, i! To provide a private branch exchange capable of connecting incoming calls from telephones to a desired extension telephone.
purpose.

[Summary of the invention]

To achieve this objective, the private branch exchange according to the present invention has one
Requesting means for requesting an extension number signal corresponding to the extension number of the extension telephone desired by the caller to be sent to an off-premises telephone connected to an outside line when a call is received; and a reading means for reading the extension number signal from the off-premises telephone. and a connection means for connecting the outside line to the extension having the extension number read by the reading means.

The present invention is characterized in that the outside line is automatically connected to the extension line in response to an extension number signal from the off-premises telephone.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments.

FIG. 1 shows a private branch exchange 4 according to an embodiment of the present invention.

This private branch exchange 4 has one main telephone 8 and a plurality of extension telephones 91 + 9! + . The external line 11 is connected to a line 12 and a line 13 by a switch 3. Connected in series to the line 12 are a telephone key 5 for connecting incoming calls from the outside line 11 to extension telephones 9+, 9+1, . . . , 9n during manual operation, and a telephone key 7 for manual/automatic switching. The electric key 5 has two contacts 51, 5/l, and the electric key 7 has a contact 7'.

The line 13 also includes a 16 Hz response circuit η that detects a 16 Hz signal, loops the line, and responds, and a dial request circuit that requests dialing to the off-premises telephone 1.

A shaping circuit for shaping the dial signal from the off-premises telephone 1 and a reading circuit 5 for reading the dialed number requested by the off-premises telephone 1 from the shaped signal are connected. Also, the connection circuit 6 connects the external line 11 based on the reading result of the reading circuit.
Connect to any of the extensions 101, 102, . . . + 10n to which Y extension telephones 9+, 9z+, . . . , 9n are connected. The control circuit 26 switches the switch 3 based on the operation of the electric key 5.7.
This is a circuit that controls the

FIG. 2 shows the reading circuit 25 in detail, and the input terminal n
This is to process the dial pulse wave signal input from the machine and decipher the number of dial pulses. The input terminal n is connected to a timing circuit 29 via a delay circuit section. The timing circuit section is the output terminal N.

It has T'+ 1'f's 1 TB HTa. When a pulse is input to the timing circuit section, the predetermined time TI
, s, T* After IT4, output terminal T'r r Tt, T%
, a pulse is output from T2. These times T+
, T, Ts, and Ta are determined based on the diamond pulse wave signal and will be described in detail later. From the output end N, there are exit ends T,',T;.

T'3. Tj also outputs an H level signal during a period in which no H level pulse is output. AND circuits 30, 31, and 32 are connected to output terminals T's, T/, and H of this timing circuit 29, respectively. The other input terminal T7 of these AND circuits 30, 31, and 32 is connected to the delay terminal 34.
'a? The OR circuit is connected to one input terminal via the OR circuit, and the output terminal of the AND circuit 32 is connected to the other input terminal. That output end of the OR circuit is connected to one input end of the latch circuit 37. The other input terminal of the latch circuit 37 is
It is connected to the output end TI' of the timing circuit section, and the output end is connected to AND circuits 30, 31, and 38. The output terminals of the AND circuits (9) and 31 are connected to the input terminal of a counting circuit 36 that counts the number of pulses of the dial pulse wave signal. The reset input terminal of the counting circuit 36 is connected to the output terminal of the OR circuit, which is connected to the output terminal and the output terminal of the OR circuit 33.

The counting result of the counting circuit 36 is transferred to the storage circuit 39 and stored therein, but the timing of this transfer is determined by the output of an AND circuit connected to the output terminal of the latch circuit 37 and the output terminal T'4 of the timing circuit 29. controlled.

Next, the operation will be explained. First, the operation when there is an operator operating the base telephone 8 will be explained. An off-premises telephone 1 is connected to an outside line 11 through a telephone exchange 2.

When an operator is present, the telephone key 7 is placed in the manual state, so the outside line 11 is connected to the line 12 by the switch 3, and the off-premises telephone 1 is connected to the main telephone 8. The caller uses the main phone 8
For the operator who responded with 91, 9! ,...
・, 9n Make a verbal request to connect to one of them. Based on this request, the operator.

111 m k, defeat it and take back the dial of main phone 8,
Connect circuit 6 to the extension telephone corresponding to that dial number.
Connect with. For example, if the extension telephone corresponding to the dial number is 91, the main telephone 8 will be connected to the extension telephone 91. The connection circuit 6 sends a calling signal to the extension telephone 91, and when the extension telephone 92 responds, the telephone key 5 is restored. When the telephone key 5 is restored, the contact 5' is restored, and the control circuit section detects this and operates the switch 3 to connect the off-premises telephone l to the extension telephone 91.

When the call ends and the handset on extension number 9 is dialed,
Restore to initial state.

Next, the operation when the operator is absent will be explained. When the operator is absent, the electronic key 7 is turned over to enter the automatic state. Then, the control circuit A switches the switch 3 through the contact 7' and connects the external line 11 to the line 13. Electric again! By the operation 1!7, the main telephone 8 becomes one of the extension telephones. In this state, when there is an incoming call from off-premises telephone 1, the 16 ratio receiving circuit n changes to 1.
Detects a 6 Hz flaw signal, loops the line, and responds. 1
When the 6Hz receiving circuit .rho. responds, the dial request circuit is activated and sends a pre-stored voice, for example, "Please dial the extension number" to the off-premises telephone 1.

In response to this request from private branch exchange 4, the caller calls extension telephone 9. , 9g+kawa+9H, a dial pulse wave signal as shown in FIG. 3(a) is transmitted from the off-premises telephone 1. Figure 3 (a
), turn the dial for 16.

This shows the change when the dial's short-circuit contact spring (not shown) operates to short-circuit the transmitter/receiver circuit (not shown) and the current increases. This shows the change when the current decreases. Also, 17.18 are the first and second dial pulses, which in this case indicate that the dial "2" has been turned. When the dial pulse wave signal shown in a) passes through the telephone exchange 2, it becomes a differential waveform as shown in FIG. 3(b). In FIG. 16', 17', 18', 1
9' are 16, 17, and 18 in Figure 3(a), respectively.
This is a waveform corresponding to No. 19. FIG. 3(b) The busy dial pulse wave signal is inputted to the shaping circuit via the outside @U, the switching device 3, the line t3.16, and 22 receiving circuits, where it is shaped and processed. The shaping circuit adjustment is composed of, for example, a Schmitt trigger circuit, and the dial pulse wave signal after shaping is shown in Fig. 3(c).
K will be shown.

The pulse Pt+Pt of this dial pulse wave signal is the waveform.
, the pulse Ps has a waveform 16', and the pulse P4. Pg is dial pulse 17, pulse Pg T Pt is pulse 1
8, pulse A, pulse P, waveform 19, pulse P, P
le and PIl correspond to waveform 21.

This shaped dial pulse wave signal is input to a reading circuit 5 to read the number of dial pulses. This interpretation is performed using the characteristics of the dial pulse wave signal. Among the dial pulse wave signals, pulse Pl,! Z Ha, n,
The period TI between pulses P and P, the period Tz between pulse P4 and pulse P6, the period T3 between Hals P and pulse Pg, and the period T4 between pulse P7 and pulse Pa have characteristics. , between pulses P+, Pt, Po and pulse Ps
This is because it can be distinguished from the period between , Pe + Pro, and Po. The period T is the period from the time a caller starts turning the dial with his or her finger until the time the caller releases his or her finger.
Depends on the caller's dialing operations. On the other hand, 1 period Tz, period T39 and period T4 are fixed times determined by the speed at which the dial returns. Also, pulse P1
The period from to pulse Ps is.

Since the transmitter of the off-premises telephone 1 is short-circuited by the short-circuit contact spring of the dial, there is no risk of noise being input from the transmitter. There is a time relationship 'n)T4)Tt>- between these periods Ti, Ts, Ta, and T4.

The operation of reading the dial pulse wave signal shown in FIG. 3(c) will be explained in more detail with reference to FIG. When a pulse is input from the input end moss, the timing circuit starts up and the period 'r
,, T! , Ta, output end Ti after T4, %
/.

Tm'I A high level pulse is output from T'4.

An H level signal is output to the output end N during a period other than when these pulses are output. The reason why the delay circuit section is provided is that the timing circuit 29 is activated after the input pulse is input to the AND circuits 30.3 and 32.

When the pulse h of the dial pulse wave signal is input, the timing circuit starts up, but the next pulse P! If the input timing is not in any of the periods TI, Tt, Ts, and T4, the AND circuit 32 connected to the output terminal N turns on, turns on the OR circuit O, and clears the counting circuit 36. do. By chance, even if the pulse b and the subsequent pulse P3 are input after the periods TI and Ti, the AND circuit 30.3 is in the reset state because the latch circuit 37 is in the reset state.
1 is never turned on. Pulse Ps is input and period T
After i, the OR circuit 35 is turned on to clear the counting circuit 36 and the latch circuit 37 is set.

An H level signal is output to AND circuits 30 and 31. When the pulse P4 is input in this state, the timing circuit 4 is restarted, and when the trap pulse P1 is input after the period T2, the AND circuit is turned on and the counting circuit A counts "1".

Thereafter, when the pulse P6 is input after one period Ts, the AND circuit 31 is turned on, and the counting circuit 36 further counts "1", resulting in a total count of "3". Counting circuit 3
6 outputs the number N of dial pulses expressed by the following equation to the memory circuit 39 for this count value n.

N=(n+1)/2 In this case, since the count value n is "3", the dial pulse number N is "2". After inputting pulse P~, period 6
If no pulse is input even after the
The counting circuit 39 counts and transfers the number of dial pulses N (in this case, "2") to the storage circuit 39 and stores it. Thereafter, the OR circuits 33 and 35 are turned on via the delay circuit 34, clearing the counting circuit 36 and resetting the latch circuit 37, returning to the initial state. For this reason, pulse P@,
Even if p,, P+o+P++ is input, the counting circuit 36 does not count, and these pulses P@+h+PI+
pH becomes invalid.

The number N of dial pulses read in this way (r2J in this case) is transferred from the output terminal 40 of the reading circuit 5 to the connection circuit 6.
The connecting circuit 6 outputs this number of dial pulses N(r
2J) Extension phone number 9 is roaring! Connect to. Next, a calling signal is sent from the connection circuit 6, and if the extension telephone m'h responds, a call can be made.

As described above, according to this embodiment, even if the operator of the main telephone is absent, one caller can automatically call the extension telephone by operating the dial on his or her own telephone.

In the previous embodiment, the outside line was one circuit, but a relatively large-scale private branch exchange that connects multiple outside lines may be used.

Conversely, the present invention can also be applied to a small-scale telephone connection device such as a so-called parent-child telephone with about 10 extension telephones. Alternatively, an unmanned private branch exchange without an operator may be used.

In this case, equipment used for manual switching becomes unnecessary.

Also, a special signal may be used instead of voice as the dial request circuit. Furthermore, the reading circuit can be modified in ways other than the previous embodiments.

In short, it is sufficient if the dial pulse can be identified. Furthermore, a voice response may be requested from the caller and the voice recognition may be performed.

〔Effect of the invention〕

As described above, according to the present invention, even if the operator is absent,
The caller can be automatically connected to the desired telephone extension. Furthermore, unlike the so-called dial-in system, a regular telephone number is not occupied, so the number of extension telephones is not limited and can be expanded or reduced as necessary.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a private branch exchange according to an embodiment of the present invention, Fig. 2 is a circuit diagram of a reading circuit of the same private branch exchange, and Fig. 3 (a), (b), and (c) are block diagrams of a private branch exchange in the same premises. 5 is a time chart showing a dial pulse wave signal in an exchange. 1... Off-premises telephone, 2... Telephone exchange, 3... Switching device. 4...Private branch exchange, 5.7...Electric key, 6...Connection circuit. 8...Main phone s c+,, 9*,...+ 9n
...extension phone, 108.10! ,・”,lOn
・"Extension line, 11... External line, 22/16 Hz receiving circuit, field... Dial request circuit, 24... Shaping circuit, 5... Reading circuit, 26... Control circuit, 28.3
4...Delay circuit. 4...timing circuit, 30, 31, 32,
38...AND circuit, 33:, 35...OR circuit,
36... Counting circuit, 37... Latch circuit, 39...
・Memory circuit. Applicant's agent Kiyoshi Inomata

Claims (1)

[Scope of Claim] In a private branch exchange that connects an outside line to which an off-premises telephone is connected to any of the extensions to which an extension telephone is connected for outgoing/incoming calls. When making an i-mail, 1 is sent to the off-premises telephone connected to the outside line.
and a requesting means for requesting transmission of an extension number signal corresponding to the extension number of the extension telephone desired by the caller. reading means for reading an extension number signal from the off-premises telephone; and connecting means for connecting the outside line to the extension number read by the reading means. A private branch exchange characterized in that an outside line is automatically connected to an extension line in response to an extension number signal from the off-premises telephone.