JPH01117560A - Line state identification device - Google Patents

Abstract

PURPOSE:To allow other equipment to recognize early whether a telephone line is busy or in the calling state by sampling an output of a tone decoder so as to detect a waveform parameter of a tone signal thereby comparing it with a prescribed value. CONSTITUTION:A tone decoder 1 detects a tone signal from signals in a telephone line 2 and outputs the waveform of a tone signal, a waveform parameter detection means 3 samples the output of the tone decoder 1 to detect a waveform parameter of the tone signal. The tone signal of a specific frequency included in the signals of the telephone line 2 is a call tone, a busy tone or a call tone of a specific frequency and the tone signal of any waveform is selected depending on the state of the telephone line 2. Thus, the waveform parameter is compared with a prescribed value to identify the line state of the telephone line 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is provided on a telephone board incorporated into a computer device, for example, to inform the computer device of the line status a (busy state, call letter B) of a telephone line. The present invention relates to a line status identification device.

[Conventional technology]

2. Description of the Related Art Various intelligent telephones that connect to computer devices and perform data communications have been on the market.

[Problems to be solved by the invention C] Conventional intelligent telephones cannot identify the line status (busy status, ringing status) of the telephone line, so when communicating, for example, when the other party is calling, It was difficult to tell whether the other party was busy or not, and even when the other party was busy, the user had to make unnecessary calls for a long time.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a line status identification device that allows other equipment to quickly recognize whether the line status of a telephone line is busy or ringing.

[Means for solving problems]

The line status identification device of the present invention identifies the line status of a telephone line in which the waveform of a tone signal differs between a busy state and a ringing state.

For this purpose, a tone decoder detects a tone signal from a signal on a telephone line, the tone decoder outputs a tone signal waveform, and a waveform parameter detection means samples the output of the tone decoder to detect the waveform parameters of the tone signal. The line condition of the telephone line is identified by comparing the waveform parameter with a predetermined value by the identifying means.

[Effect]

According to the configuration of the present invention, the line state of the telephone line is identified by sampling the output of the tone decoder to detect the waveform parameters of the tone signal and comparing the waveform parameters with predetermined values. The device can be made to recognize at an early stage whether the telephone line is busy or ringing, and unnecessary calls can be avoided when the other party is busy.

[Real/flow side]

An embodiment of the present invention will be described based on FIGS. 1 to 6. This line state identification device identifies the line state of a telephone line in which the waveform of a tone signal of a specific frequency differs between a busy state and a ringing state.

For this purpose, as shown in Fig. 1, a tone decoder 1 detects a tone signal from a signal on a telephone line 2, and a tone decoder 1 outputs a tone signal waveform (see Fig. 5; details will be described later). and the waveform parameter detection means 3 samples the output of the tone decoder l to detect the waveform parameter of the tone signal (for example, the maximum value of the length from the rising edge of the tone signal waveform to the subsequent first falling edge). The identification means 4 compares the waveform parameters with predetermined values to identify the line state of the telephone line 2 (busy state 8 call letter B).

Next, the configuration and operation of the telephone board including this line status identification device will be explained based on FIGS. 2 to 6.

FIG. 2 shows the configuration of a computer system to which a telephone board is installed. In FIG. 2, reference numeral 11 denotes a computer device, which consists of a processing section 12 and a telephone board 13 installed in an optic slot (not shown). Data is exchanged. 14 is a keyboard connected to the computer device 11, and 15 is the same CRT display device.

The telephone board 13 is connected to a telephone line (public telephone line or PBX extension) 2 via a communication connector 16, and is connected to a standby telephone 21. Headset (handset) 22. Call ringer 23. It is connected to the hold sound source 24.

FIG. 3 is a block diagram showing a specific configuration of the telephone board 13. As shown in FIG. In FIG. 3, 31 is a bus interface circuit, 32 is a network control circuit, 33 is a telephone device body, 34 is an incoming call detection and loop detection circuit, and 35 is a speech IC (IR3N) that performs 274-line conversion of audio signals.
31 is made by Sharp ■), 36 is a dial IC (LR48051) that generates a dial signal, 37 is a tone decoder (lR3NO5; made by SHIP 91), and 38 is a dial IC that generates an incoming call output in response to an incoming call detection signal. Incoming call ringer 23
39 is a dip switch.

FIG. 4 is a block diagram showing a specific configuration of the network control circuit 32. In Figure 4, 41.42
is the parallel interface, 43 is the CPU (280)
, 44 is a serial interface, 45 is a CTC, parallel interfaces 41 and 42 are connected to the telephone device body 33, and the serial interface 44 is connected to the bus interface circuit 31. The parallel interface 42 is TC74HC294 (manufactured by Toshiba ■), and the parallel interface 41°CPU
43. Serial interface 44 and CTC45
is integrated as TMPZ84CO15AF (manufactured by Toshiba ■).

Next, the operation of this telephone board will be explained. This telephone board has the following functions.

- When a command + dial number is given from the automatic call computer device tt, a dial signal is sent to the telephone line.

■ When an automatic incoming call is received, an incoming notification message is sent back to the computer device 11.

Therefore, automatic answering is possible by performing hook control after receiving a call.

(2) On-hook/off-hook, etc. are controlled by commands from the hook control computer device 11.

(2) Tone Detects various tones such as a dial tone and a busy tone, and notifies the computer device 11 of the detection results. As a result, the computer device 11 can perform one-call response recognition, one-line monitoring, and the like.

(2) Status notification In response to a status request command from the computer device 11, the status of the telephone board 13 is read and sent back to the computer device 11 as status data.

■ Others In addition to the above functions, switching to the backup telephone 21.

Inputs hold music from external sources, etc.

Next, the operations related to the line state identification function of the parts constituting the line state identification device in the telephone board 13, that is, the tone decoder 37 and the network control circuit 32, will be explained in detail.

The tone signal of a specific frequency included in the signal of the telephone line 2 includes a dial tone with a waveform shown in FIG.
There is a busy tone signal with the waveform shown in 1 and a ring tone signal with a specific frequency of the waveform shown in FIG. Therefore, by detecting the waveform parameter of the tone signal (the maximum value of the length from the rising edge of the tone signal waveform to the subsequent first falling edge) and comparing the waveform parameter with a predetermined value, The line status of the telephone line 2 can be identified.Then, by sending this identification result to the processing unit 12 in the computer device 1, the line status of the telephone line 2 can be quickly detected by the processing unit 12 in the computer device 11. It is possible to recognize the roar,
Transfer processing etc. can be performed efficiently.

In this case, the frequency of the tone signal is 400 Hz if the telephone line 2 is a public telephone line.

Also, among the tone signals, the dial tone (indicating the transmission status) is
As shown in FIG. 5 Fa+, the waveform is continuously high level. In addition, the busy tone (indicating the busy state) is
As shown in the figure (bl), '[''11 seconds (=500ms)
This waveform alternately repeats a high level period between T1□ seconds (=500 m5) and a low level period between T1□ seconds (=500 m5). Furthermore, the ringing sound (indicating the ringing state) is 'l''z + seconds (=31 A 16Hz period of Tff1 seconds (=1 second) and a low level of T3f seconds (2 seconds), which are made by repeating alternately a high level period of T.5m5) and a low level period of T.seconds (=31.5m5). This is a waveform that repeats periods.

The tone decoder 37 in FIG. 3 detects a tone signal with a frequency of, for example, 40011z from the signal in the telephone line 2, and converts the tone signal to its waveform (FIG. 5+al or (bl or (!l, +d)) in FIG. The frequency of the tone signal is different between the public telephone line and the PBX extension, so in order to deal with both, two types of tone signals are used: one for the public telephone line and one for the PBX extension. It is necessary to prepare a tone decoder and use a switch to select the tone decoder according to the intended use.

In addition, the network control circuit 32 includes the CPU 4
3 operates according to the flowchart of FIG. 6 to detect the waveform parameters in the waveform output from the tone decoder 37 and compare them with predetermined values to identify the line state of the telephone line 2, and transmit this identification result to the bus interface. It will be sent to the processing section 12 in the computer device 11 via the circuit 31.

This will be explained in detail below. As shown in FIG. 6, the CPU 43 in the network control circuit 32
The output signal of the tone decoder 37 is sampled every 10 m by the interrupt signal given from 45 every 10 m, and three pieces of sampling data are taken in (step S1
).

Next, in step S2, it is determined whether two or more of the three sampling data are at a high level.
), if the determination result is NO, the process returns to step S1.

On the other hand, when the determination result in step S2 is YES, tone detection is started and the contents of the sample value register are set to 1 (step S3).

Next, the output signal of the tone decoder 37 is changed to 10+a by the interrupt signal given every 10@s from the CTC 45.
Each time, three pieces of sampling data are taken in (step S).

Next, it is determined whether two or more of the three sampling data are at a high level (step S
S) *If the determination result in step S5 is NO, the contents of the sample value register are set to 0 and the process returns to step S6) and step S.

Also, if the determination result in step S above is YES,
Increment the contents of the sample value register by 1 and compare the contents of the sample value register with the contents of the maximum sample value register, and if the contents of the sample value register are greater than the contents of the maximum sample value register,
The contents of the sample value register are set to the maximum sample value register, and in the opposite case, the contents of the maximum sample value register are not updated (step S7).

Next, it is determined whether the sampling time after the start of tone detection has elapsed for a certain period of time T4 ("-3 seconds) (step S8). Note that this certain period of time is limited to a ring tone with a long repetition period in the waveform of the tone signal. This is to ensure that all waveforms of the tone signal can be reliably distinguished by sampling both the busy tone and ringing tone waveforms over at least one cycle.

In this example, it is set to 3 seconds, which is equal to the repetition period of the ringing tone that satisfies the above-mentioned fixed time.

If the determination result in step S8 is No, the process returns to step S4.

On the other hand, if the determination result in step S8 is YES, it is determined in which range the contents of the maximum sample value register are located, and the process returns to step S1). The contents of the maximum sample value register described above become the above-mentioned waveform parameter (the maximum value of the length from the rising edge of the tone signal waveform to the subsequent first falling edge).

In this case, according to steps 31 to S8 of the flowchart constituting the waveform parameter detection means 3 of FIG. 1, if the tone signal in the telephone line 2 is a dial tone with a waveform as shown in FIG. , the contents of the sample value register increase by 1, 2, 3 degrees, etc. every 30 degrees from the start of tone detection, that is, from the rise of the waveform,
At this time, the contents of the maximum sample value register are similarly increased by 1.

Since the waveform does not go to low level at all until 3 seconds have passed from the start of the waveform, 3 seconds after the start of tone detection.
After seconds have passed, theoretically the contents of the sample value register and the contents of the maximum sample value register will each be 10G.

In addition, if the tone signal in the telephone line 2 is a busy tone with a waveform as shown in FIG. increases by 1 as 1.2゜3, etc. At this time, the contents of the maximum sample value register also increases by 1, and 500m
Just before the first elapsed falling edge, the contents of the sample value register and the contents of the maximum sample value register would theoretically be 17. When the waveform falls, the contents of the sample value register become 0, but the contents of the maximum sample value register remain 17. After the second rising edge of the waveform, the contents of the sample value register are 1.
2.3. ..., and becomes 0 when the waveform falls, and the contents of the sample value register continue to be 0 during the low level period of the waveform.

Thereafter, this operation will be repeated until 3 seconds have elapsed from the start of tone detection. On the other hand, the contents of the maximum sample value register are compared with the contents of the sample value register each time the contents of the sample value register are incremented, and are updated only when the contents of the sample value register are larger.

Furthermore, the tone signal in the telephone line 2 is shown in FIG. 5(C).

(In the case of a ringing tone with a waveform as shown in dl, 30
After the IIS elapses, the contents of the sample value register and the maximum sample value register become 1, but this waveform repeats high level and low level at a frequency of 1611z for 1 second after the first rise, that is, 31. 2
Since the high level period of 5 ffi and the low level period of 31.25 appear alternately, the contents of the sample value register alternate between l and 0 during the period from the first rise of the waveform until 1 second has elapsed. Repeatedly, the contents of the maximum sample value register will remain l. Note that the contents of the sample value register maintain 0 during the subsequent low level period of the waveform.

In step S9 of the flowchart constituting the identification means 4 in FIG. For example, assuming that the tone signal is a dial tone and telephone line 2 is in the outgoing state, and the content of the maximum sample value register is in the range of 13 to 2o, it is assumed that the tone signal is a busy tone and telephone line 2 is in the outgoing state. It is assumed that the state is busy, and if the contents of the maximum sample value register are in the range of 1 to 3, the tone signal is set to ring telephone line 2.
is considered to be in the calling state.

In addition, in the above flowchart, the reason why three pieces of sampling data are taken in for each Ioffls and the sample value is incremented after determining whether all three pieces of sampling data are at a high level is due to a malfunction caused by a noise pulse. This is to prevent

In the line state identification device of this embodiment, a tone decoder 1 detects a tone signal of a specific frequency from a signal in a telephone line 2, a tone decoder 1 outputs a tone signal waveform, and a waveform parameter detection means 3 detects a tone signal of a specific frequency. The output of the decoder 1 is sampled to detect the waveform parameters of the tone signal, and the identification means 4 compares the waveform parameters with predetermined values to identify the line state (busy state, ringing state) of the telephone line 2. This allows other Ja devices such as computer equipment to quickly recognize whether the telephone line 2 is busy or ringing, and prevents unnecessary calls when the other party is busy. can be avoided.

〔Effect of the invention〕

According to the telephone line status detection device of the present invention, the output of the tone decoder is sampled to detect the waveform parameters of the tone signal, and the line status of the telephone line is identified by comparing the waveform parameters with predetermined values. This allows other devices such as combiator devices to quickly recognize whether the telephone line is busy or ringing, thereby avoiding unnecessary calls when the other party is busy. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a line-type B identification device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the configuration of a computer system into which a telephone board including the line status identification device according to the embodiment is inserted. Figure 3 is a block diagram showing the configuration of the telephone board, Figure 4 is a block diagram showing the configuration of the network control circuit, Figure 5 is a waveform diagram of the tone signal,
FIG. 6 is a flowchart showing the operation of the CPU in the network control circuit. 1...Tone decoder, 2...Telephone line, 3...
Waveform parameter detection means, 4...Identification means Patent applicant OG Information System Co., Ltd./32

Claims (1)

[Scope of Claims] A line state identification device for identifying the line state of a telephone line in which the waveform of a tone signal is different between a busy state and a ringing state, the method comprising: detecting the tone signal from a signal on the telephone line; a tone decoder that outputs a waveform of the tone signal; a waveform parameter detection means that samples the output of the tone decoder to detect a waveform parameter of the tone signal; and a waveform parameter detected by the waveform parameter detection means that is set to a predetermined value. and identification means for identifying the line condition of the telephone line by comparing the line condition with the telephone line.