JPS60213161A - Mode setting system of acoustic coupler - Google Patents

Abstract

PURPOSE:To remove a mode setting miss by detecting the existence of a receiving arriving at a telephone line, and setting up the mode of an acoustic coupler in accordance with the detected result. CONSTITUTION:A signal received from a receiver through a microphone 12 is sent as received data RD to a terminal equipment through a filter 20, a MODEM 30 and an interface part 40. The mode is temporally set up to a calling mode and the existence of a carrier is checked by a carrier detecting circuit 61. If a carrier in a high frequency group is detected, the mode is fixed to the calling mode, and when the receiving carrier is not detected, the existence of a transmission request signal RS is checked. When the transmission request signal RS exists, the transmission signal is sent to transmit data. When there is no signal RS, a hand set is hooked on.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an acoustic coupling device used as a matching means for connecting a telephone line used for data transmission and various information processing devices or terminal devices, etc. It is related to the method.

[Prior art]

In this type of acoustic coupling device (acoustic coupler), for example, when performing full-duplex communication, one side is set to a low reception band (108
0±100Hz), and the transmission band is set to high fP (1750±10Hz).
Data transmission between the acoustic coupling devices is performed by setting one device to the incoming call (ANSWER) mode with a frequency of 0 Hz), and setting the other device to the calling (CALL) mode with the receiving band set to the high group and the transmitting band set to the low group. I am doing it. In this case, conventionally, both operators had a meeting over the phone or the like, and each set the mode manually based on the results of the meeting.

For this reason, there is a drawback that communication is rarely possible if either operator accidentally sets the call originating or incoming call mode to each other. In addition, it often has the disadvantage of requiring an expensive changeover switch to set the mode.

[Object and structure of the invention]

The present invention was made in view of the above circumstances, and its purpose is to realize an inexpensive acoustic coupling device that eliminates the labor required for mode setting, eliminates erroneous settings, and eliminates the changeover switch. The purpose of the present invention is to provide a mode setting method for an acoustic coupling device that enables the following.

In order to achieve such an object, the present invention is provided with means for detecting the presence or absence of a receiving carrier arriving at a telephone line, and means for setting a mode in accordance with the detection result. Hereinafter, the present invention will be explained in detail using Examples.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 10 is a speaker 11 and a microphone 12.
A handset connected to a telephone line is set in the acoustic coupling section 10 to perform communication.

That is, a signal received from the handset through the microphone 12 has its noise component removed by the filter 20, is demodulated by the modem 30, and is sent to the terminal device as received data RD via the interface section 40. Furthermore, the transmission data SD sent from the terminal device is modulated by the modem 30 and sent to the speaker 1 via the amplifier 50.
1 to the telephone line via the transmitter. 60 is omitted in the diagram, but it can be implemented using a control circuit equipped with a well-known CPU.
Control signals are sent and received to and from the terminal device via the interface section 40, for example, a transmission request signal R8 is received from the terminal device, a transmission permission signal C8 is transmitted to the terminal device, and data is exchanged between the telephone line and the telephone line. Control sending and receiving. A carrier detection circuit 61 detects a carrier from a received signal and sends a carrier detection signal CD to a terminal device. Reference numeral 62 denotes a gate circuit, which is opened and closed controlled by the output of the carrier detection circuit 61 and outputs an input clock pulse to the first counter 63. The output of the first counter 63 is the filter 20
and is sent to the modem 30 and the second counter 64, and the output of the second counter 64 drives a buzzer circuit 65 that issues an alarm indicating that the mode cannot be set, as will be described later, and also resets the first counter 63. .

Next, Fig. 2(a), (b) and Fig. 3(a)
The operation of the above configuration will be explained in detail using .

FIGS. 2(a) and 2(b) are flowcharts showing the operation when transmitting and receiving data using the acoustic coupling device of this embodiment.

First, a handset is set in the acoustic coupling section 10 described above (step 1001). As a result, the power to the acoustic coupling device is turned on t'L (step 1002), and initialization is performed (step 1003).

At this time, the count lIn of the second counter 64 is cleared by rOJ.

Here, let's temporarily set the mode to calling mode.Step 1
004), and checks whether there is an F carrier in the carrier detection circuit 61 (step 1005). At this time, if a high group carrier is detected, the other party sends a message (//) using a high group carrier.
1, that is, the call receiving mode is set, the call mode is fixed as it is (step 1006), and normal communication is performed from then on. That is, step 1007) of transmitting the carrier detection signal CD.
While receiving the data (step 1008),
Check the presence or absence of the transmission request signal R8 (step 1009)
If it is detected, it sends out a transmission ready signal C8 (step 10).
10) Send the transmission data sent from the terminal device to the telephone line (step 1011). This is repeated while the received carrier is detected (step 1012). If the transmission request signal R8 is no longer detected, the transmission enable signal C8 is stopped (step 1013), in which case half-duplex communication for reception only is performed.

If the received carrier is no longer detected (step 1012), after stopping the transmittable signal (step 10
14) Check the presence or absence of the transmission request signal R8 (step 1
If 015L is not detected, the handset is turned on to end the communication (step 1016), but if the transmission (I! request signal is received) (steps 1015 and 1009),
Sends a transmission enable signal and performs data transmission (step 10)
10.1011). That is, during this period, half-duplex communication is performed only for transmission.

On the other hand, if a carrier in a high group is not detected in the detection of a received carrier after the provisional setting of the calling mode (step 1005), a carrier in a low group is Sending step 1021), and after 1 second, setting the incoming call mode (
Step 1022).

The above TI = 1 second is provided to confirm the presence or absence of a receiving carrier. , which is the first counter 63
It is measured by

That is, in FIGS. 3(a) to 3(e), the first counter 63
As shown in the flowchart for explaining the operation, when the power is turned on (FIG. 3(a)), a clock pulse b is input to the gate circuit 62 (FIG. 3(a))).

At this time, while there is no received carrier and the output C of the carrier detection circuit is at the =H'' level (Fig. 3(c)), the gate circuit 62 is in an open state, so the input clock pulse passes through the gate circuit 62t. (FIG. 3(d)).The first counter 63 counts this input pulse and sets its output e to 'H' level after 1 second has elapsed (FIG. 3(d)). (e)).

This 1H'' level output is sent to the filter 20 and modem 3G, and the incoming call mode is set.

After setting the incoming call mode, the presence or absence of a receiving carrier (low group) is checked (step 1023), and if detected, it means that the other party is transmitting using a carrier in the low group, that is, the calling mode is set. Therefore, the terminal stays in the incoming call mode and sends and receives data in the same manner as described above (step 1024).

If a received carrier is not detected after setting the incoming call mode, the carrier (high IFF) is transmitted (step 10
26) and detection of the received carrier (low group) (step 102)
3) Repeat.

When T2; 2 seconds elapse without a carrier being detected, that is, when the output of the first counter 63 returns to the sL' level, the count value n of the second counter 64 reaches the predetermined count value A1.
For example, determine whether it exceeds 20 (step 1027), and if it does not, increment the value of n by rlJ (step 1028) and repeat the above operations starting from the provisional setting of the calling mode (step 1004). . If the received carrier is detected during that time, that is, if the output of the carrier detection circuit 61 changes to IL' (Fig. 3(C)
), the gate circuit 62 is in the closed state (Fig. 3(d)).
, the output of the first counter 63 is fixed. On the other hand, if the value of n exceeds A=20, that is, the output of the first counter 63 is jl! As shown by the broken line in Figure 3 (e), repeat 1 second ◆L# and 2 seconds sH' TI +T2
) If the mode cannot be fixed after X20=60 seconds have elapsed, it is determined that some kind of abnormality has occurred, and the buzzer sounds to notify the operator of this fact (step 1030).
). That is, when the count value n=20, the output from the second counter 64 drives the buzzer circuit 65. At the same time, the first counter 63 is reset. Note that it is of course possible to use a display device that provides some kind of visual display instead of the buzzer circuit 65.

In this way, by detecting the presence or absence of a reception carrier with a temporary diameter of the mode, and depending on the detection result, setting mode f: fixed, or temporarily setting it again to another mode and repeating the same operation, mutually appropriate mode will be automatically set. - In the above-described embodiment, the calling mode is first provisionally set, and then, if a receiving carrier is detected, the calling mode is fixed, but if the receiving carrier is not detected, the calling mode is provisionally set. If the received carrier is detected in that state, the mode is fixed to the incoming call mode, but first the incoming carrier mode is provisionally set, and if the received carrier (low group) is not detected, the calling mode is set. I won't give up until I tell you that it's okay to do something like that.

Although an example in which the mode is set in the acoustic coupling device itself has been described above, the mode may also be set by a control signal from a terminal device connected to the acoustic coupling device.

FIG. 4 is a block diagram showing an embodiment of the present invention in such a case. This embodiment is an example in which the present invention is applied to a text conversation device that is equipped with a keyboard and a display for people with speech/hearing disabilities, etc., and allows conversations using a telephone line using text. It consists of 10 ports (terminal device) and an acoustic coupling device 200. The main body 10 includes a control unit 110 equipped with a well-known microprocessor;
Keyboard 120 with character keys and various function keys
, a display unit 130 consisting of a liquid crystal display panel, and A for converting frequency signals arriving at the telephone line into digital signals.
It has a D conversion section 140 and is connected to the music coupling device g1200 via an interface section 150. The acoustic coupling device 200 includes a control unit 21 equipped with a microprocessor.
0. Microphone 2201 for extracting the frequency signal arriving at the telephone line; Conversely, a sophisticated speaker 23a1 for sending the frequency signal to the telephone line; A1 Ang 240; Phil Goo 2
50, has a modem 260t'', and has an interface section 27
It is connected to the main body 100 through 0.

Here, from the amplifier 240 to the filter 250, the modem 2
In addition to the normal receiving signal path that reaches the interface section 270 via the amplifier 240 and the telephone line M (I input m28
0 is provided, and this makes it possible to extract the frequency signal that arrives on the telephone line. The extracted signal is converted into a digital signal by the AD converter 140, and then
It is sent to the control unit 110 as described later, and the control unit 110
identifies the condition of the telephone line from its type and causes the display section 130 to perform a predetermined guide display.

That is, after turning on the power, if a frequency signal (line status sound) arriving on the telephone line via the above-mentioned route is received as shown in FIG.
The presence or absence of an audible signal is checked (step 2002), and if the audible signal continues for one second or more (step 2003), it is determined that it is a dialable signal and a message to that effect is displayed on the display unit 130 (step 2004).

If the 400Hz audible signal δ is not continuous for more than 1 second, further check whether it is an intermittent sound with a duration of 0.5 seconds or less (step 200).
5) The intermittent tone indicates that the other party is busy (step 2006), and if the above intermittent tone does not occur, it is determined that it is a ring bank tone, and the message "The other party is calling" is displayed.
is displayed (step 2007).

Also, if a 400Hz audible signal is not detected, detect the presence or absence of a receiving carrier, for example, a high group receiving carrier (step 2008), and if detected, it means that the other party is transmitting a low group carrier, that is, an incoming call. This is because the control unit 110 is set to the control unit 21 mode.
0 to control the filter 250 and modem 260 and set them to call mode (step 2009). Then, the low group transmission carrier is output (step 2010), and a display indicating that text conversation can be conducted is performed (step 2011). On the other hand, if a high number of received carriers are not detected, after waiting for the predetermined time T3 to elapse for confirmation [step 2020], the other party responds by voice, that is, the other party uses a text conversation device similar to this embodiment. It is determined that the telephone is not being used and is being answered by voice as a normal telephone, and a message to that effect is displayed (step 2021).

On the other hand, if no line signal tone is detected first (
Step 2001), and after waiting for the predetermined time T3 to elapse for confirmation (Step 2030), it is determined that the call is on the 9N side, and the call receiving mode is set (Step 2031).
). Then, the high group carrier is output (step 2032), and a display indicating that text conversation is possible is performed (step 2011).

After confirming that both parties can communicate using text, the keyboard 120
A mutual text conversation is carried out via the telephone line based on the input from and the output to the display unit 130. That is, input data from the keyboard 120 is sent to the modem 260.
The signal is modulated by the modem 260 and sent out to the telephone line via the speaker 230, and conversely received via the microphone 220, and is demodulated by the modem 260, and the received message is displayed on the display section 130.

In this way, various guide messages are displayed according to the state of the telephone line, which is identified by modifying the line signal tone extracted from the input line 280K, so the operator can make calls with peace of mind by following these guide messages. be able to.

Here, the fact that the mode of the acoustic coupling device is automatically set according to the judgment of the control unit 110 according to the damage state of the carrier caused by the input line 280 makes such a text conversation device even more convenient to use. There is. This is true even when applied to general data transmission limited to text conversation devices, and is particularly useful for people with disabilities who find it difficult to discuss setting modes over the phone in advance.

Note that in the above-described embodiment, it is of course possible to reverse the settings of the calling mode and the calling mode.

In other words, if a low group of received carriers are detected, set to incoming call mode, and if no signal is detected,
ms, the μ call mode may be set.

〔Effect of the invention〕

As explained above, according to the present invention, p1 It is no longer necessary to manually set the mode as in the past, and setting errors can be eliminated, and the mode changeover switch can be changed to 11, making it possible to realize an inexpensive acoustic coupling device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
3(a) to 3(e) are time charts, FIG. 4 is a block diagram showing another embodiment of the present invention, and 5. The figure is a flowchart showing an example of the operation. 10...9 acoustic coupling unit, 11, 230... speaker, 12.220... microphone, 20.
250---filter, 30, 260e・fist-modem, 40,150,270---intern ace section, 60,120,210---control section, 61 fist・
・-Carrier detection circuit, 62... Kate circuit, 63
．． 64@...Counter, 65...Fist buzzer circuit, 1
00...Main unit (terminal device), 140...AD
Conversion unit, 200... Acoustic coupling device, 280...
-Telephone line status signal input line. Patent applicant Masaki Yamakawa (2 Rikime) Agent, Tamura Electric Manufacturing Co., Ltd. Fig. 2 (b) Atsushi Fig. 4 Fig. 5 Natsume

Claims (1)

[Claims] It is equipped with a means for extracting a frequency signal arriving at a telephone line, a means for detecting the presence or absence of a receiving carrier from the extracted frequency signal, and a means for setting a mode in accordance with the detection result. An acoustic coupling device characterized by automatically setting.