JPH01284094A - Communication equipment - Google Patents

Abstract

PURPOSE:To decrease the number of tone detection means and to simplify the constitution by detecting a tone signal through the periodic connection of a channel to plural external lines sequentially through exchange switches. CONSTITUTION:A 400Hz detector 5 detects a busy tone or an opposite party interruption tone from a dial tone from plural external lines. An exchange switch is switched sequentially as to an external line not in use to connect the 400Hz detector 5 to an external line channel sequentially. In case of sequential monitor of COT1-COTn, the 400Hz detector 5 is reconnected to the next external line to that connected at present and uses a 100msec timer and observes the 400Hz detection output and repeats it when no output exists. When detected, the circuit is initialized and a 50sec timer is used for standby. Thus, it is possible to check 10 external lines or so and release is reduced considerably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device having a tone detection function, and particularly relates to enabling the number of tone detection means to be less than the number of office lines.

[Prior Art] In recent years, with the increase in private branch exchange services, the need for outside line signal monitoring has increased. For example, it is essential to detect a busy tone from an outside line, such as an answering machine, automatic transfer of an outside line to an outside line, or automatic re-ringing of an outside line.

In conventional private branch exchanges or key telephones, after forming a DC loop for an outside line, a dial tone detection means or dial tone detection means or a dial tone detection means, a dial tone detection means, a dial tone detection means, a caller disconnection detection means, and a second
Each outside line trunk had a 400 Hz detection means to detect various 400 Hz tone patterns such as dial tones.

[Problems to be Solved by the Invention] In the above-mentioned conventional example, a tone detection means is provided for each outside line track, so it is necessary to provide as many tone detection means as there are outside lines. Therefore, there is a problem that the configuration becomes complicated.

[Means for Solving Problems] In the present invention, the number of tone detection means can be reduced by connecting the tone detection means to a plurality of outside lines periodically and sequentially using exchange switches to detect tone signals. It has been reduced.

[Embodiment] In recent years, private branch exchanges, key telephones, etc. have become capable of providing various services and have many convenient functions.

For telephone service, it is necessary to detect various sounds that indicate the status of the outside line, but in general, analog telephone lines
These signals are shown with 400 Hz interruptions.

Typical signals include a dial tone indicating that continuous 400 Hz dialing signals can be sent, a ring tone with 4001 (z modulated in amplitude at 16 Hz), a busy tone that turns 400 Hz on and off in 0.5 second increments, or a disconnection signal. 400 additional sounds
There is a second dial tone that turns the Hz on and off in 0.25 second increments.

These signals - appear only briefly during a call and do not require a quick reaction, but if not constantly monitored, the call may be terminated, such as when a voice answering machine transfers to an outside line. However, the outside line will still be captured, which is undesirable from the point of view of line efficiency. Also, when automatically transferring an incoming external line call to another external line that requires automatic calling, or when automatically re-calling when the other party does not answer, it may be necessary to disconnect and re-call if the other party is busy.

The present invention relates to a method of sequentially checking a plurality of outside lines to see if these 400 Hz signals are detected in a predetermined pattern.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a private branch exchange according to this embodiment.

This figure shows an example. 1 is an analog telephone line. 2 is an outside line trunk and has functions such as forming a DC loop, sending out dial pulses, and detecting incoming calls. 3 is an exchange switch, and a space switch or a time division switch is used. 4 is a telephone connected to the exchange. 5 is a 400Hz detector connected to the exchange switch, and 6 is a CPU that controls the entire system. Reference numeral 7 represents a memory storing a program of exchange control information, 8 a memory for storing various states and function settings, and 9 a timer for performing periodic operations.

In this embodiment, an example is shown in which one 400)1z detector 5 detects dial tones and busy sounds or caller disconnect sounds from a plurality of outside lines. As a simple example, you can sequentially switch the exchange switch for unused outside lines to 400H in 5.
Consider the case where the z detectors are sequentially connected to the outside line communication path. FIG. 2 is a flowchart showing the control operation of the CPU 6 of this embodiment. FIG. 2 shows a process of sequentially monitoring C0Tl to C0Tn or a flow of monitoring an outside line signal. In step 1, reconnect the 400H2 detector next to the currently connected outside line, and in step 2, the timer (10
Wait for 0m s e C) and then step 3 to 40
If you do not see a detection output of 0Hz, return to ■ and repeat. If detected, initialize in step 4 and step 5
Wait in this state using the 50m5ec timer.

Then, in step 6, the output of 400 Hz is detected again, and if detected, the process proceeds to step 7. Step 7: Determine whether it has turned on rather than off, or whether it remains on. If it remains on, step 8: CNTO? :1 In addition, if the maximum busy tone is 50x12 600 msec or more in step 9, it means that a dial tone has been detected. At this time, it will send a message to the exchange process and return to step l. If 400Hz is not detected in step 6 after several loops, it is determined in step 11 whether it has changed from on to off, or whether it has continued to be off, and if it has changed by 1, step 12 will turn it on. 500 hours
m5ecf: Check whether it is in loOmsec, and if it is not applicable, return to the step (however, if it is detected for the first time, proceed to the next step).If it is appropriate, set the current state to OFF in step 13.0LD=O) counter CNTO
is set to 0, and 1 is added to the pattern counter (CNT l ). If this value or the specified value (for example 7), it means that one busy tone has been detected, so send a message to the exchange process,
I decided to check the next outside line. If it is less, go to step 5 again, and if 400Hz is not detected again after 50m5ec, 0LD = O in step 11, so add 1 to CNTO in step 16, and check whether the value of counter CNTO is greater than 12 in step 17. to decide. If it is greater than 12 in step 17, proceed to step 1, and 12
If it is smaller, proceed to step 5. Therefore, it is repeated only if the off state is not too long (600 msec or more), and if it is too long, the next external line check is performed. Similarly, if the next 400 Hz is on in step 6, on will be detected through steps 18 and 19.

As mentioned above, if 600msec or more is detected, dial tone is detected, and 500m5ec±10
If 0m5ec is alternately turned on and off, it means that CNTl is 7 or more, that is, a busy tone is detected in 4 cycles.

In this embodiment, whether the pattern check is used to detect the dial tone and the busy tone (or the tone when the caller disconnects), the second dial tone is checked depending on the nuclear line state, or other signals are detected. It's good, and it would be more efficient to skip over and check the outside lines that you don't use. If it is not detected further, it is checked every 100m5ec, but this may be done faster or slower.Similarly, the timer 5 is of course a repeater even if it is even faster than 100m5ec.

According to this method, it is possible to check the outside line at the normal 10 outside line level, which greatly reduces the number of releases and is very desirable.Furthermore, it is possible to check the outside line at the 10 normal outside line level, which is very desirable.Furthermore, it is possible to check the outside line at the 10 normal outside line level, which is very desirable. Additional installation is easy and can be done by simply replacing the program, resulting in great effects. [Effects] As described above, according to the present invention, the configuration for tone detection can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment. FIG. 2 is a flowchart showing the control operation of the CPU 6 in this embodiment. l is the communication line, 2 is the external trunk, 3 is the exchange switch,
4 is a telephone, 5 is a tone detector. 6 is a CPU, 7 is a program memory, 8 is a RAM, and 9 is a timer.

Claims (2)

[Claims] (1) In a communication device that accommodates multiple outside lines, such as a private branch exchange or key telephone device, there is an exchange switch that forms a communication path between the outside line and the extension line, and a dial tone and busy tone received from the outside line. What is claimed is: 1. A communication device comprising: means for detecting a tone signal such as a tone signal, and wherein said detecting means detects a plurality of outside lines by sequentially switching inputs thereof. (2) The communication device according to claim 1, wherein the tone detection means is connected to one port of an exchange switch to perform switching.