JPH01265693A - Incoming tone synchronizing system - Google Patents

Abstract

PURPOSE:To attain incoming tone synchronization of a general telephone set by preparing a transmission circuit of all '0' pattern of PCM to an office line trunk and preparing a reception circuit of the pattern to a line circuit. CONSTITUTION:A call signal from a preceding exchange is detected by a call signal detection circuit 2 and inputted to an SEL 4 and an MPU 5. The SEL 4 switches the PCM voice signal and all '0' pattern signal and sends the PCM all '0' pattern to a TSW 6 of a time division channel at a period in synchronism with the call signal. The MPU 5 sends incoming information to the CPU 7. The CPU 7 controls the TSW 6 to close the channel between the trunk 1 and the line circuit 8. The circuit 8 uses a synchronizing signal detection circuit 9 to detect the PCM all '0' pattern from the trunk 1. The CPU 7 sends the incoming information to the circuit 8 and when the MPU 12 receives it, the MPU 12 ANDs an output of the circuit 9 with the incoming tone synchronizing signal in the case of incoming tone synchronization to turn ON-OFF a relay 13. Thus, the incoming tone synchronism of a general telephone set is realized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to private telephone exchange equipment (hereinafter simply referred to as PBX) such as a button telephone device and a private telephone exchange device, and in particular,
This invention relates to a ringtone synchronization method suitable for installing two sets of BXs and using one as a behind-the-scenes PBX.

[Conventional technology]

Conventionally, the ring tone synchronization method in a behind-the-scenes PBX required a multi-function telephone to be equipped with a listening capability. FIG. 2 shows the configuration of a conventional ring tone synchronization method for a multi-function telephone (hereinafter referred to as MFT). The diagram shows the central office trunk and multifunction telephone line circuits. In FIG. 2, block 1 is a central office line trunk, and is composed of 2 to 5 element blocks. 2 is a calling signal detection circuit, 3 is an analog-digital signal converter (hereinafter simply referred to as C0DEC), 4 is a digital signal switching unit (hereinafter simply referred to as SEL), and 5 is a control unit for each element ( (hereinafter simply referred to as MPU). or,
Block 6 is a time division switch (hereinafter simply referred to as TSW)
, block 7 is a central processing unit (hereinafter simply referred to as CPU)
It is. On the other hand, block 16 is a multi-function telephone line circuit and is composed of 9 to 11 element blocks.

17 is CODEC118 is data transmission section, 19 is MPU
Yes, 20 is MFT. Conventional ring tone synchronization will be briefly explained using FIG. 2. A calling signal from the preceding exchange, which is input from the terminal 1.2, is detected and identified by the calling signal detection circuit 2), and is input to the 5EL4 and MPU5. The MPUs sends the incoming call information to the CPU 7, and
EL4 has a switching function between the PCM audio signal and the tone signal (digital pattern) input from terminal 3, and switches the tone signal to T in synchronization with the calling signal from the preceding exchange.
Send to SW6.

On the other hand, after detecting an incoming call from the central office trunk, the CPU 7
W6 to close the communication path between the office line trunk and the multifunction telephone line circuit.

The multifunction telephone line circuit 16 receives a tone signal synchronized with a calling signal from the office line trunk 1, converts it from digital to analog signal, and transfers it to the MFT.

Further, the CPU 7 sends incoming call information in synchronization with the ring tone to the multifunction telephone line circuit 16. When the multi-function telephone line circuit 160 MPU 19 receives the incoming call information with ringtone synchronization, it transfers the ONI information from the MFT built-in speaker from the data transmission unit 18 to the MFT. According to the above sequence, a ringing tone using a tone signal synchronized with the ringing signal from the preceding exchange is sounded from the MFT speaker. Next 2W
A conventional method of synchronizing ringtones for ordinary telephones will be briefly explained.

FIG. 3 shows the configuration of a conventional ring tone synchronization method for general telephones. In FIG. 3, block 1 is a central office line trunk, and is composed of element blocks 2, 3, and 5. 2 is a calling signal detection circuit, 3 is C0
DEC, 5 is an MPU, block 6 is a TSW, and block 7 is a CPU.

Further, block 8 is a line circuit, and is composed of 10 to 13 element blocks. 10 is C0DEC11
1 is an address decoder, 12 is an MPU, 13 is a calling signal control relay, 14 is a calling signal source, and 15 is a 2W general telephone (601 telephone, etc.).

A calling signal from the preceding exchange inputted from the terminal 1.2 is sent to the calling signal detection circuit 2, which detects and identifies it and sends it to the MPU 5. The MPU 5 receives incoming call information synchronized with the calling signal.
By sending the signal to the PU 7, the 9 CPU 7 identifies the cycle of the ringing signal using software and determines the period of the ringing signal.
An incoming call signal synchronized with the calling signal is sent to the PU 12. M
Based on the information from the CPU 7, the PU 12 turns the discharge signal control relay 15 ON-OFF via the address decoder 11.
let A calling signal from the discharge signal source 14 is sent to the general telephone 15 in the ON-OFF cycle of the calling signal control relay 13, and the bell of the telephone rings in synchronization with the calling signal from the preceding exchange.

[Problem to be solved by the invention]

The disadvantage of the conventional ring tone synchronization method for general telephones mentioned above is that the period of the ringing signal of the central office line trunk is detected by software, which greatly increases the amount of software processing and may exceed the processing capacity. .

An object of the present invention is to provide ring tone synchronization for general telephones by sharing the same with the central office line trunk used for ring tone synchronization for conventional multi-function telephones without increasing software processing. .

[Means to solve the problem]

The above objective is achieved in the following manner. That is, instead of tone signals in the prior art for multifunction telephones,
By preparing a PCM all "0m pattern transmitting circuit in the central office line trunk," and preparing a PCM all "05 pattern receiving circuit in the line circuit," Control signals can be sent from the line circuit to the line circuit. The central office trunk sends an all-zero pattern of PCM synchronized with the cycle of the calling signal from the preceding exchange to the line circuit via the communication path. By receiving the all "0" pattern of the PCM, the line circuit synchronizes with this signal and turns the calling circuit of the telephone 0N-O.
By doing this, it is possible to synchronize the ringtones of regular telephones.

[Effect]

Using the all "0" pattern of PCM as a control signal poses a risk of malfunction because the "0" pattern is output when a high voice level is input during a call. However, in the line circuit, the incoming call condition from the software and the '0'' pattern detection condition are ANDed.
Since the discharge signal control relay is turned on and off, there is no malfunction during a call.

〔Example〕

Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 shows the central office trunk and line circuit of an exchange according to the present invention. In FIG. 1, block 1 is a central office line trunk, and is composed of 2 to 5 element blocks.

2 is a calling signal detection circuit, 3 is C0DEC14 is S
EL, 5 is an MPU. Further, block 6 is a TSW, and block 7 is a CPU.

On the other hand, block 8 is a line circuit and is composed of 9 to 13 element blocks. 9 is a synchronization signal detection circuit for a calling signal, υ1o is a CODgClll is an address decoder, 12 is an MPU, and 15 is a relay for controlling a discharge signal. Furthermore, 14 is a calling signal source, and 15 is a 2W general telephone (such as a 6o1 telephone).

Next, the operation of ring tone synchronization according to the present invention will be explained with reference to the block diagram shown in FIG. A calling signal from the preceding exchange that is input from the terminal 1.2 is detected and identified by the calling signal detection circuit 2, and is input to the 5EL4 and MPU5. The MPU 5 sends the incoming call information to the CPU 7, and the 5EL4 has a function to switch between the PCM audio signal and the PCM all "0" pattern signal, and the PCM all "0" pattern signal is switched at a cycle synchronized with the discharge signal from the preceding exchange. The pattern is sent to TSW 6 on the time division channel.

Further, after detecting an incoming call from the office line, the CPU 7 controls the TSW 6 to close the communication path between the office line trunk and the line circuit.

In the line circuit 8, the PCM all "0" pattern from the office line trunk 1 is detected and identified by the discharge signal synchronization signal detection circuit 9.

On the other hand, the CPU 7 sends incoming call information to the line circuit 8. When the MPU 12 of the line circuit 8 receives the incoming call information, it identifies whether it is a general incoming call or a ring-tone synchronized incoming call, and if the incoming call is ring-tone synchronized, it performs an AND operation between the output of the synchronization signal detection circuit 9 of the ringing signal and the ring-tone synchronized incoming signal. Then, the calling signal control element, such as the relay 13, is turned ON and OFF. Calling signal source 14
The call signal from 0N- of the discharge signal control relay 16
At the OFF' cycle, the bell of the telephone rings in synchronization with the ringing signal sent to the general telephone 15 from the preceding exchange.

〔Effect of the invention〕

According to the present invention, the ring tone synchronization of a general talking machine can be configured mainly by hardware, so that the processing capacity of the software is not reduced. In addition, the ring tone synchronization method and central office line trunk for multi-function telephones can be shared,
It is possible to easily respond to expansions and changes on the existing side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the ring tone synchronization method according to the present invention, FIG. 2 is a block diagram of the ring tone synchronization method in a conventional multi-function telephone, and FIG. 3 is a block diagram showing ring tone synchronization in a conventional general telephone. FIG. 2 is a diagram showing blocks of the method. T1. T2...Connection terminal with the central office line or extension of the preceding exchange T3...Tone signal reception terminal 1...
Office line trunk 2... Calling signal detection circuit 3.10.17... Analog/digital signal converter 4... Digital signal switching unit 5.12.19... ...M for trunk line control
PU6...Time division switch 7...Central processing unit 8...Line circuit 9...Call signal synchronization signal detection circuit 11...
... Address decoder 13 ... Calling signal control relay 14 ...
Calling signal source 15...General telephone 16...Multi-function telephone line circuit 18...
...Data transmission section 20...Multi-function telephone

Claims (1)

[Claims] In a time-division channel type exchange, an incoming call signal received from a central office line is sent to the time-division channel via a central office line trunk, received by a line circuit, and a ringing signal control element of the line circuit is operated; A ring tone synchronization method that is characterized by making the ring tone of a general telephone set synchronize with the incoming call signal from the central office line.