JPH02172356A - Dtmf signal reception system - Google Patents

Abstract

PURPOSE:To recognize a pushphone signal accurately by stopping the transmis sion of a voice message for a prescribed time when a frequency component of a DTMF signal is detected during the transmission of a voice message, detecting the presence of the frequency component of the DTMF signal again, and discriminating the incoming of the DTMF signal. CONSTITUTION:While a voice message is sent from a telephone terminal equip ment, when a pushbutton(PB) detector 26 detects the frequency component of a pushphone signal (DTMF signal), the transmission of the voice message from a voice message transmission/reception circuit 17 for a prescribed time is stopped. Then the presence of the frequency component of the DTMF signal is detected in this state and it is discriminated that the DTMF signal comes from the telephone line only in the presence to apply reception processing. Thus, the voice message during transmission and a pushphone signal from the line are distinguished clearly, and misreception of the pushphone signal and malfunction is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a J5 dual reception puff type for a telephone terminal device that performs data communication using DTMF signals.

For example, a person who owns an answering machine with an I-phone function may operate the remote control of his/her phone from outside using a push-button signal in order to listen to a message recorded on his/her phone while he/she is away. 1. Also, for example, when reserving a seat reservation ticket in a row by telephone, the telephone signal will be J, then 71. In this case, for example, with an answering machine, the operator will dial 100 from the answering machine. .I'm away from home right now, so the butshuhon signal (in the voice message band) while the 4th grade voice message is being sent.
Therefore, it is necessary for the answering machine to distinguish the received button signal from a voice message and proceed to the next various operations. 1 [Prior art] The buttons "0" to (91, l' a), different frequencies are set for that row and column (columns 1 to 4).
The columns are 697HZ, 7701-IZ, respectively.
852 days/'941H2, lines 1 to 3 are each 1
2091-1z, 133GHz, , 1477H
2) Through this combination, a so-called Butshuphone signal is obtained in which signals are superimposed and synthesized on two frequencies.

On the other hand, telephones are equipped with pushbutton <PB) detectors that detect push-button signals coming in from the line, but since voice messages are also sent out using the same line, it is inevitable that The B detector receives a pushphone signal from the line and an outgoing voice message.

Generally, the audio signal band is 0.3kH2...34kl
-There are 124 signals, and the band of the Butshuphone signal is 03k)-
There is no particular problem if it is in a range other than lz~3.4k)-12, but since it is in the band of the butshuphone signal (around lz~3.4k)-12, if a butshuhon signal comes in while the fame message is being sent, the butshuhon signal will not be transmitted. If this is not clearly distinguished from a voice message, malfunctions may occur.Therefore, as a method to prevent such malfunctions, the following conventional methods have been used.
Several methods have been proposed. For example, ■ a method to distinguish voice messages from voice messages by transmitting a button signal of a certain predetermined frequency with regular repetitions that cannot be found in voice signals; and ■ voice messages. There is a method in which a silent period of a predetermined period is set in the middle of the sound to distinguish it from a phone signal.
There is a way to distinguish between voice messages whose frequency components constantly change minutely and signals whose frequency components remain constant for a certain period of time. 1 [Problem to be solved by the invention] Moe's conventional method of Because of the restrictions placed on the bamboo itself, these had the problem of requiring time and effort to operate the Push-L button and create voice messages.

The present invention provides a DTMF signal reception power formula that allows a telephone terminal device to accurately recognize a button signal (in the voice message band) by a simple method when the telephone terminal device receives a button signal (in the voice message band) while transmitting a voice message. The purpose is to

[Means to solve the problem]

FIG. 1 shows a diagram of the operating principle of the present invention. In the present invention, when the frequency component of the DTMF signal is detected while the telephone terminal device is transmitting a voice message (step 50), the telephone terminal device stops transmitting the voice message for a certain period of time (step 5).
1) In this state, the presence or absence of the frequency component of the D'rMF signal is detected again in step 52), and only in the right case, it is determined that a DTMF signal is coming from the telephone line and reception processing is performed (step 53). .

[Effect]

The band of the butshuphone signal is in the band of the audio signal, so
If a telephone signal is received while a voice message is being sent, a malfunction may occur unless the two are clearly distinguished.
According to the present invention, the frequency components of the pushbutton signal are detected while the voice message is being sent. If detected, it is determined that a push signal is coming from the line.

Thereby, it is possible to clearly distinguish between the voice message being sent and the telephone signal from the line, and it is possible to prevent erroneous reception of the telephone signal, thereby preventing malfunction.

[Embodiment] FIG. 2 shows a block diagram for implementing the method of the present invention. In the same figure, 1 is a rectifier circuit, 2 is a ringer IC, and 3 is a stone Buddha detection circuit. The second input is supplied to the second input (consisting of the first input ``1''). In the control section 4, press the function button 5 (+--'?t
□Determines whether or not to operate the answering machine function according to the mode set in the risk configuration) and performs well-known processing accordingly. 16 is a rectifier circuit, 7 is a circuit control unit, When answering a call or making a call, the knock switch 91 is closed by off-knocking the handset 80 to form a loop for the line. This off-hook can also be detected in the control section 1 by opening the knock switch 92.

10 (in the dial, 1 and 11 are dial ICs, and when a predetermined button is operated when making a call, the operation of the dial IC 11 turns on and off transistors 1 to X+ and X2 of the line control section 7 to generate a dial pulse signal, Reference numerals 1 and 12 are speech ICs that transmit audio signals from the transmitting section of the handset 8 to the line via the balanced circuit network 139 and the line control section 7 when transmitting, and when receiving signals from the line. 8
Voice number n is supplied to the receiver R of the handset 8. , the speech IC 12 is composed of an amplifier 14, 15, and an AGC (automatic gain control) circuit 16. 1゜17 is a voice message transmitting/receiving circuit, which has a recording/reproducing IC13 and a DRAM.
19 (message converted to 〇 is stored). If the answering machine function is set to active mode, after receiving a call, the voice message will be played from the recording/playback ICl3 that is set to playback mode.
When this reproduction is completed, the recording/reproducing ICl3 is put into recording mode and the audio signal from the line is recorded.

Reference numeral 21 is an analog switch, which is turned on when recording while the user is away, and turned off when not in use. 22 is an amplifier, and 23 is a 〇〇 circuit. , 24 is an analogue telephone, which is used when the owner of the answering machine sends a voice message. At that time, the analog switch 25 is turned on. 2
6 is a PB detector, which has a push core 7\n signal band (1k
HZ '4ij later) signals (Push 1 phone signal itself and voice messages in the Butsy phone signal band)
Detect. Reference numeral 127 designates a speaker receiver button, which is linked to the analog switch 29 and is used as a platform for transmitting signals reproduced from the voice message transmitting/receiving circuit 17 to the speaker 28. The operation during transmission will be explained.

FIG. 3 shows a control unit 4 for explaining the operation of the main parts of the present invention.
Operation flowcharts 1 to 1 and FIG. 4 respectively show timing charts i to illustrating the operations.

First, there is no push-phone signal component in the voice message,
In Figs. 1 and 2, which describe the case where a telephone signal is received from the line, if the function button 5 is set to the answering machine function mode, the control unit 4 is activated by an incoming call from the line. 1~ of the line control section 7
Ran resistor x 1. ×2 are respectively turned on and a line loop is formed, and the recording/reproducing IC13 of the voice message transmitting/receiving circuit 17 enters the reproduction mode, and the speech IC1
2, the balanced circuit network 131 is sent to the line via the circuit control section 7. This is switch 21. PB via amplifier 22
A detector 26 is also supplied. At this time, if the owner of the answering machine sends a push button signal from outside the home, the
The B detector 26 detects that there is a received signal (in this case, a push-button signal from the line (DTMF in FIG. 4A)) (YES in step 100), and the controller 4
The amplifier 15 of the speech 1012 is turned off by the signal from the microphone 1 of the speaker 10, and the voice message being sent to the line from the high voice message transmitting/receiving circuit 17 is stopped (Mute in FIG. 4 (A>)) (Step 101).

Next, in this state, the PB detector 26 determines whether or not there is a received signal (step 102); in this case, since a telephone signal is coming from the line,
It is detected that there is a received signal (Mu in Fig. 4 (△))
Received signal after le-on) (YES in step 102)
. Thereby, the signal is regarded as a telephone signal from the line and normal reception processing is performed (step 103).

Next, we will explain the case where there is a phone signal component in the mobile phone message and the phone signal is coming from the line. It is detected that there is a voice message and a push-1 phone signal from the line connected to the smartphone network (Y1 of the smartphone 100).
YoS). From this point on, the same operation as in the case of Moeki is performed to receive the push-phone signal from the line.

As described above, the present invention does not impose special restrictions on the form of the push-phone signal or the form of the voice message as in the prior art, but simply converts the voice message to %J1 and in this state illuminates the touch-tone signal component. It is possible to clearly distinguish between a voice message and a voice message by detecting the voice message and receiving and processing the voice message based on this result, thereby preventing the false reception of the voice message.
Next, there is a push-button signal component in the voice message,
The case where no push-phone signal is received from the line (incoming call from another person) will be explained next. In FIG. 2, when the received signal is detected by the PB detector 26, it is detected that there is actually a voice message signal (DTMF in FIG. 4 (13)) in the pushbutton signal band. (YES in step 100), to stop the voice message being sent from the voice message transmitting/receiving circuit 17 to the line (Mute in FIG. 4(B)) <Step 10
1) Next, it is determined whether there is still a received signal in this state (step 102), and in this case, since no signal is received from the line, the voice message is stopped. The received signal disappears and is detected (received signal after lv+Ute-On in FIG. 4(B)) (NO in step 102), With this detection,
Under the control of the control unit 4, the mute of the amplifier of the speech IC is released, and the voice message whose transmission has been stopped is transmitted again (step 104).

(Effects of the Invention) As explained above, according to the present invention, it is possible to clearly distinguish between a voice message being sent and a button signal from the line, and to prevent erroneous reception of a button signal.・Therefore, it is possible to prevent ihamadōhaku.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the motion of the present invention; Fig. 2 is a block diagram for implementing the method of the present invention; Fig. 3 is a flowchart of the operation of the control section 4, which explains the operation of the main parts of the present invention. , FIG. 4 shows timing charts 1 to 1 for detailed explanation of the present invention. In the figure J3, 4 is the control unit (microcomputer), 5 is the function button, 7 is the line control unit, 8 is the handset, 12 is the speech IC 1, 13 is the balanced circuit network, 15 is the amplifier, 16 is △ GC circuit, 17 is a voice message transmitting/receiving circuit, 18 is a recording/playback IC1, and 19 is l) RAM. 20 is a filter, and 26 is a PB detector. (A) (B) O (selling B month's!'ms is explained L = first tie) no kunayat Figure 4

Claims (1)

[Claims] In a method of receiving a DTMF signal from a telephone line, the above-mentioned DTMF signal is transmitted while a telephone terminal device is transmitting a voice message.
When the frequency component of the signal is detected, the transmission of voice messages from the telephone terminal device is stopped for a certain period of time, and in this state, the presence or absence of the frequency component of the DTMF signal is detected again, and only when the frequency component is detected, the DTMF signal is transmitted from the telephone line. DTM is characterized in that it performs reception processing upon determining that there is an incoming message.
F signal reception method.