JP4237123B2 - Service using terminal and control method thereof - Google Patents

Description

  The present invention relates to a service using terminal and a control method therefor, and in particular, a dial for selecting a desired service type from the service using terminal side while listening to telephone voice guidance of the service type provided by the service providing terminal. The present invention relates to a service using terminal for transmitting a number (DTMF service selection signal) and a control method thereof.

  Conventionally, a service provider and a service user are connected via a telephone network, a voice guidance is transmitted from the service provider, and the service user quickly selects a desired service by pressing a dial while listening to the service voice guidance. However, this uses a push button (PB) telephone (Pushphone (registered trademark)) of a service user, and a service selection signal (DTMF (dual tone multi frequency) signal is transmitted to a voice guidance transmission terminal. Need to be received more accurately and reliably.

  As shown in FIG. 4, the DTMF signal is divided into three high group audio frequencies F1, for each of the 12 dial buttons 40 (1, 2, 3,..., *, 0, #). The audio frequency signals are assigned one from F2 and F3 and one from four low group audio frequencies f1, f2, f3 and f4.

  However, the reflected signal of the voice guidance is reflected toward the service provider's voice guidance transmission terminal due to the impedance mismatch of the 2-wire to 4-wire conversion circuit, and happens to be the high group voice frequencies F1, F2 unrelated to the DTMF service selection signal. , F3 or low group voice frequencies f1, f2, f3, f4 are detected, the service providing terminal cannot receive a genuine DTMF service selection signal.

  Therefore, in order to prevent erroneous recognition of the DTMF service selection signal at the service providing terminal, in Patent Document 1, the transfer function is calculated based on the output signal of the voice guidance input / output circuit and the output signal of the 2-wire to 4-wire conversion circuit. Find the reflected signal and cancel it.

  In Patent Literature 2, a signal obtained by removing a frequency component corresponding to a DTMF signal from a voice guidance signal is transmitted to a service user.

  In Patent Document 3, a service providing terminal identifies a DTMF signal by comparing voice guidance with a DTMF signal.

  In Patent Document 4, at the moment when the low group or high group voice frequency component included in the voice guidance is detected during transmission of the voice guidance, the low group or high group voice frequency component in the voice guidance is reduced by a filter.

  As described above, Patent Documents 1 to 4 disclose a method for preventing erroneous recognition of a DTMF signal (service selection signal) at a service providing terminal.

  Note that, in addition to using the DTMF signal as a service selection signal, a method of reliably performing dial transmission for starting a line connection is also disclosed. For example, in Patent Document 5, a slave unit is used as a master unit connected to a telephone line. In the system for wireless connection, each digit of the telephone number is dialed at regular intervals and at regular intervals based on a predetermined signal frame transmitted from the slave unit.

  In Patent Document 6, in a bank service system or the like in which a push button (PB) phone is connected to a computer, the telephone number set by the computer as a push button phone is set so as not to make a mistake in the phone number of the other party to be connected. Then, it is determined whether or not the telephone number actually transmitted by the push button telephone is the same, and the result is notified to the computer, and the transmission is stopped.

JP-A 63-299528 (FIG. 1, page 3) JP-A-1-238258 (FIG. 1, page 3) JP-A-2-158258 (FIG. 1, page 3) Japanese Patent Laid-Open No. 11-346374 (FIG. 1, page 4) Japanese Patent Laid-Open No. 6-252989 (FIG. 1, page 3) Japanese Patent Laid-Open No. 6-30451 (FIG. 1, page 2)

  However, in the inventions disclosed in Patent Documents 1 to 4, it is not possible to completely prevent the DTMF service selection signal from being erroneously recognized. The dial button must be kept pressed or pressed multiple times, which is inconvenient.

  Patent Documents 5 and 6 do not relate to transmission of a DTMF signal as a service selection signal, but merely transmit a counterparty telephone number by a DTMF signal for line connection.

  Therefore, according to the present invention, when the DTMF service selection signal is transmitted during the arrival of the voice guidance, the service providing terminal 2 recognizes the DTMF service selection signal more accurately and correctly than in the past only by pressing the dial once. An object is to provide a use terminal and a control method thereof.

  In order to solve the above-described problems, the service using terminal and the control method thereof according to the present invention adopt the following characteristic configuration.

(1) In a service using terminal that receives voice guidance from a service providing terminal and transmits a DTMF service selection signal for selecting a desired service,
A DTMF service selection signal generation circuit for generating the DTMF service selection signal;
The DTMF service in which a superimposed signal obtained by superimposing the voice guidance signal and the DTMF service selection signal is input, a DTMF signal is detected from the superimposed signal at predetermined time intervals, and the detected DTMF signal is transmitted. A DTMF signal detection circuit for determining whether or not the selection signal matches,
A service using terminal that continues to transmit the DTMF service selection signal until the detected DTMF signal matches the transmitted DTMF service selection signal.

(2) a dial memory for storing the dial number when the dial button corresponding to the DTMF service selection signal is pressed;
The service using terminal according to (1), wherein when the predetermined time interval elapses, the dial number is read and the DTMF service selection signal is continuously transmitted.

(3) a 2-wire to 4-wire conversion circuit for inputting the voice guidance signal;
A first attenuation circuit for attenuating the voice guidance signal output from the 2-wire to 4-wire conversion circuit by a first attenuation rate;
A second attenuation circuit for attenuating the DTMF service selection signal by a second attenuation rate;
An adder for adding the outputs of the first and second attenuation circuits;
The service using terminal according to (1), wherein an output of the adder circuit is input to the DTMF signal detection circuit as the superimposed signal.

  (4) The service using terminal according to (3), further including an attenuation rate memory that stores a relationship between the first and second attenuation factors and a line between the service using terminal and the service providing terminal.

(5) the DTMF service selection signal output from the 2-wire to 4-wire conversion circuit;
An adder for adding the voice guidance signal output from the DC loop circuit;
A high impedance circuit for inputting the output of the adder;
An amplification circuit that amplifies the output of the high impedance circuit by a predetermined amplification factor,
The service using terminal according to (1), wherein an output of the amplifier circuit is input to the DTMF signal detection circuit as the superimposed signal.

(6) In a service using terminal control method for receiving voice guidance from a service providing terminal and transmitting a DTMF service selection signal for selecting a desired service,
A DTMF signal is detected at a predetermined time interval from a superimposed signal of the DTMF service selection signal and the voice guidance signal, and whether or not the detected DTMF signal matches the transmitted DTMF service selection signal. A service-use terminal control method that continues to transmit the DTMF service selection signal until the detected DTMF signal matches the transmitted DTMF service selection signal.

(7) a first step of pressing a dial button in response to voice guidance;
A second step of storing the pressed dial number in a memory;
A third step of reading the dial number and generating a DTMF service selection signal;
A fourth step of superimposing the DTMF service selection signal and the voice guidance signal;
A fifth step of detecting the DTMF signal from the superposed signal at predetermined time intervals;
A sixth step of determining whether the detected DTMF signal matches the generated DTMF service selection signal;
If the detected DTMF signal matches the generated DTMF service selection signal, the dial number is deleted from the memory, and the transmission of the DTMF service selection signal to the service terminal is stopped, while the detection If the generated DTMF signal does not match the generated DTMF service selection signal, the service using terminal control method repeats the first step to the sixth step.

  (8) Superimposing a signal obtained by attenuating the voice guidance signal output from the 2-wire to 4-wire conversion circuit by a first attenuation amount and a signal obtained by attenuating the DTMF service selection signal by a second attenuation amount (7) Service using terminal control method.

(9) The first attenuation is output from the 2-wire to 4-wire conversion circuit to a level comparable to the voice guidance signal reflected by the 2-wire to 4-wire conversion circuit and received by the service providing terminal. And the second attenuation amount is a line loss between the service using terminal and the service providing terminal, and in the fifth step, the superposition signal is selected from the superimposed signals. (8) The service using terminal control method according to (8), which detects a DTMF signal.

(10) The service use terminal according to ( 7 ), wherein in the fourth step, the DTMF service selection signal output from the 2-wire to 4-wire conversion circuit and the voice guidance signal output from the DC loop circuit are superimposed. Control method.

  (11) The service using terminal control method according to (10), further including a step of amplifying the superimposed signal at a predetermined amplification rate, wherein the DTMF signal is detected from the amplified signal in the fifth step.

According to the present invention, when the DTMF service selection signal is transmitted during the arrival of the voice guidance, the service providing terminal 2 recognizes the DTMF service selection signal more accurately and correctly than before only by pressing the dial once. Can do.
Specifically, the first effect of the present invention is that the DTMF service selection signal transmitted from the own telephone device is detected by the own telephone device, so that even when voice guidance coming from the other party and DTMF signal transmission overlap. The transmission can be extended for a time that allows the other party to receive the DTMF service selection signal.
The second effect is that since the dial input is once held in the dial memory and the transmission time of the DTMF service selection signal is automatically controlled, there is no need to keep pressing the dial button.
A third effect is that the DTMF service selection signal is transmitted after the pressed dial number is held in the dial memory of the own telephone set, so that the same dial can be retransmitted when it is determined that the other party has detected it erroneously.

  FIG. 1 is a block diagram of an embodiment of a service using terminal.

  The service using terminal 1 receives the voice guidance transmitted from the service providing terminal 2. The voice guidance is listened to by the service user at the earpiece 13 (speaker) via the DC loop circuit 11, the 2 wire-4 wire conversion circuit 12.

  If a desired service item is announced during listening to the voice guidance, the service user presses the dial button 19 and transmits it to the service providing terminal 2 at that time. Therefore, at this time, the voice guidance reflection signal and the DTMF service selection signal are superimposed on the uplink toward the service providing terminal 2.

  By the way, the service using terminal 1 continues to transmit repeatedly at predetermined time intervals until it is determined that the DTMF service selection signal is genuinely received by the service providing terminal 2. Therefore, the pressed dial number is temporarily stored in the dial memory 23. The stored dial number is read by the control circuit, a DTMF service selection signal generation circuit 17 generates a DTMF service selection signal, and transmits it to the service providing terminal for a predetermined time interval set in the timer circuit 22.

  Here, each component of the service using terminal 1 will be described. The DC loop circuit 11 performs the DC loop closing / opening of the telephone line, and the control circuit 18 detects the hook switch 20 off-hook or on-hook. Is done.

  The voice guidance signal from the telephone line output from the DC loop circuit 11 is connected to the first attenuation circuit (received signal level attenuation circuit) 14 through the 2-wire to 4-wire conversion circuit 12 and the audio from the earpiece 13. Is output as

  The DTMF service selection signal is sent to the service providing terminal via the 2-wire-4 wire conversion circuit 12.

By the way, if the voice guidance signal level transmitted from the service providing terminal 2 is L0, the reflected signal level LR that is reflected by the service using terminal 1 and received by the service providing terminal 2 is R · L ² · L0. is there. Here, R is the reflectance, and L is the line loss. On the other hand, the voice guidance level LS received by the service using terminal 1 is (1-R) · L·L0. Therefore, in order to make LS equal to LR, it is necessary to multiply LS by L · R / (1-R).

  Therefore, if the attenuation factor (first attenuation factor) in the first attenuation circuit is L · R / (1-R), the output of the first attenuation circuit is reflected by the service providing terminal 2. It becomes equal to the signal level LR. The relationship between the first attenuation rate L · R / (1-R) and the line route may be stored in the attenuation amount memory 21. Note that an average value may be set for the first attenuation rate without using the attenuation rate memory 21.

The DTMF service selection signal is input to the second attenuation circuit 15.
By the way, if the DTMF service selection signal level transmitted by the service using terminal 1 is LD, the level received by the service providing terminal 1 is L·LD. Therefore, if the attenuation factor in the second attenuation circuit is L, the output of the second attenuation circuit becomes equal to the reflected signal level LR that will be received by the service providing terminal 2. The relationship between the second attenuation factor L and the line route may be stored in the attenuation factor memory 21. Note that an average value may be set for the second attenuation rate without adopting the attenuation rate memory 21.

  Next, the DTMF signal detection circuit 16 will be described.

  The superimposition signal (L1 + L2) (the output of the adder 30) is input to the DTMF detection circuit 16. Both L1 and L2 are voice band signals, and the DTMF signal detection circuit 16 confirms that the DTMF signal is present (detection) and that the DTMF signal matches the DTMF service selection signal (determination). Until the superimposition signal (L1 + L2) is input. The reason is that it can be expected that the superposition state of L1 and L2 changes with time and the frequency of the DTMF service selection signal does not overlap with the frequency of the voice guidance.

When the DTMF signal detection circuit 16 confirms the presence of the DTMF service selection signal in the input signal (L1 + L2), it notifies the control circuit 18 of the fact.
The control circuit 18 that has received the notification stops the transmission of the DTMF service selection signal by stopping the timer circuit 22.

  FIG. 2 is a flowchart of the service using terminal control method.

  First, in step S1, when the hook switch 20 is off-hooked, the control circuit 18 detects the off-hook, controls the DC loop circuit 11, and closes the DC loop.

  Next, in step S2, the dial button 19 is used to press the dial number of the service providing terminal 2 to make a dial call. When the service providing terminal 2 responds, a call state is established.

  Next, in step S3, the service using terminal 1 receives the voice guidance from the service providing terminal 2.

  Next, in step S4, the voice guidance is output from the earpiece 13 through the two-wire / four-wire conversion circuit 12, and is also input to the first attenuation circuit 14 (received signal level attenuation circuit). The first attenuation circuit 14 reads out the first attenuation amount stored in the attenuation rate memory 21 via the control circuit 18, attenuates the received voice guidance signal level, and inputs it to the adder 30.

  Next, in step S5, in response to the voice guidance, the service user presses a necessary dial button to select a desired service.

  Next, in step S <b> 6, when the control circuit 18 detects that the dial button has been pressed, the control circuit 18 stores the dial number (a number representing the service type) in the dial memory 23.

  Next, in step S7, the control circuit 18 reads the dial number from the dial memory 23 and sends out a DTMF service selection signal from the DTMF service selection signal generation circuit 17. The transmission of the DTMF service selection signal is transmitted to the telephone line through the two-wire / four-wire conversion circuit 12 and input to the second attenuation circuit 15 (DTMF service selection signal level attenuation circuit). The second attenuation circuit 15 reads out the second attenuation rate from the attenuation rate memory 21 via the control circuit 18, attenuates the signal level, and inputs it to the adder 30.

  In step S8, the DTMF signal detection circuit 16 starts detecting the DTMF signal simultaneously with the transmission of the DTMF service selection signal to the 2-line-4 change circuit.

  Next, in step S9, the control circuit 18 starts the timer circuit 22 when detecting the reception notification of the DTMF signal from the DTMF signal detection circuit 16, and monitors whether the DTMF signal is received for the timer time Δτ. The control circuit 18 determines the timer time Δτ according to the number of digits of the dial number stored in the dial memory 23. For example, if the time required to recognize either the high group frequency or the low group frequency is t, the number of digits of the dial number is 2, and the dial press time interval by the service user is considered, Δτ is set to at least 4t. The

  If the DTMF signal is not detected within the timer time Δτ, step S9 is repeated again.

  Next, in step S10, transmission of the DTMF service selection signal is stopped.

  In step S11, the DTMF signal detection circuit 16 compares the detected DTMF signal with the transmitted DTMF service selection signal.

  In step S11, if the two match, it is considered that the service providing terminal 2 has detected a genuine DTMF signal.

  On the other hand, if they do not match in step S11, there is a possibility that the service providing terminal 2 has detected an erroneous dial. Therefore, the process returns to step S7, and the dial number stored in the dial memory 23 is stored again. A read DTMF service selection signal is transmitted.

  Thus, the transmission time of the DTMF service selection signal is extended by the loop from step S7 to step S11 until the detected DTMF signal matches the transmission DTMF service selection signal.

  In step S12, the dial number transmitted from the dial memory is deleted in preparation for the next dial.

  Next, in step S13, the service user determines whether or not dial input is to be terminated. If repeat dial input is necessary, the process returns to step S5.

  On the other hand, if the dial input is terminated in step S13, the process proceeds to step S14, the hook switch 13 is turned on, the line is released, and the call is terminated.

  As described above, the service using terminal control method has been described with reference to FIG. 2, but the execution of step S10 may be performed between step S11 and step S12 or between step S12 and step S13.

  In the service use terminal control method described above, the DTMF signal detection circuit 16 compares the detected DTMF signal with the transmitted DTMF service selection signal in step S11. However, the present invention is not limited thereto. The signal may be compared with the transmitted DTMF service selection signal.

  FIG. 3 is a block diagram of another embodiment of the service using terminal.

  Only the differences from the embodiment of FIG. 1 will be described. The output of the DC loop circuit 11 (voice guidance signal) and the output of the 2-wire to 4-wire conversion circuit (DTMF service selection signal) are input to the adder circuit. The high impedance circuit 31 receives the added output with high impedance to such an extent that it is not affected by the AC impedance mismatch, and is amplified by the amplifier circuit 32. The output of the amplifier circuit 32 is input to the DTMF signal detection circuit 16. The amplification factor is set appropriately.

  In the embodiment of FIG. 3, since the DTMF signal is detected only from the frequency components included in these signals regardless of the difference between the voice guidance signal level and the DTMF service selection signal level, the detection accuracy is inferior to that of the embodiment of FIG. However, there is an advantage that the circuit configuration can be simplified.

It is a block diagram of one Example of a service utilization terminal. It is a flowchart of a service utilization terminal control method. It is a block diagram of the other Example of a service utilization terminal. It is a figure which shows the relationship between the dial number of a push button (PB) telephone, and DTMF signal.

Explanation of symbols

1 Service using terminal 2 Service providing terminal
11 DC loop circuit 12 2-wire to 4-wire conversion circuit 13 Earpiece 14 First attenuation circuit 15 Second attenuation circuit 16 DTMF signal detection circuit 17 DTMF service selection signal generation circuit 18 Control circuit 19 Dial button 20 Hook switch 21 Attenuation rate memory 22 Timer circuit 23 Dial memory 30 Adder circuit 31 High impedance circuit 32 Amplifier circuit

Claims (11)

In a service using terminal that receives voice guidance from a service providing terminal and transmits a DTMF service selection signal for selecting a desired service,
A DTMF service selection signal generation circuit for generating the DTMF service selection signal;
The DTMF service in which a superimposed signal obtained by superimposing the voice guidance signal and the DTMF service selection signal is input, a DTMF signal is detected from the superimposed signal at predetermined time intervals, and the detected DTMF signal is transmitted. A DTMF signal detection circuit for determining whether or not the selection signal matches,
A service using terminal, wherein the DTMF service selection signal is continuously transmitted until the detected DTMF signal matches the transmitted DTMF service selection signal. A dial memory for storing the dial number when a dial button corresponding to the DTMF service selection signal is pressed;
2. The service using terminal according to claim 1, wherein when the predetermined time interval elapses, the dial number is read and the DTMF service selection signal is continuously transmitted. A 2-wire to 4-wire conversion circuit for inputting the voice guidance signal;
A first attenuation circuit for attenuating the voice guidance signal output from the 2-wire to 4-wire conversion circuit by a first attenuation rate;
A second attenuation circuit for attenuating the DTMF service selection signal by a second attenuation rate;
An adder for adding the outputs of the first and second attenuation circuits;
2. The service using terminal according to claim 1, wherein an output of the adder circuit is input to the DTMF signal detection circuit as the superimposed signal.   4. The service using terminal according to claim 3, further comprising an attenuation rate memory storing a relationship between the first and second attenuation rates and a line between the service using terminal and the service providing terminal. The DTMF service selection signal output from the 2-wire to 4-wire conversion circuit;
An adder for adding the voice guidance signal output from the DC loop circuit;
A high impedance circuit for inputting the output of the adder;
An amplification circuit that amplifies the output of the high impedance circuit by a predetermined amplification factor,
2. The service using terminal according to claim 1, wherein an output of the amplifier circuit is input to the DTMF signal detection circuit as the superimposed signal. In a service using terminal control method for receiving voice guidance from a service providing terminal and transmitting a DTMF service selection signal for selecting a desired service,
A DTMF signal is detected at a predetermined time interval from a superimposed signal of the DTMF service selection signal and the voice guidance signal, and whether or not the detected DTMF signal matches the transmitted DTMF service selection signal. A service-use terminal control method comprising: determining and continuing to transmit the DTMF service selection signal until the detected DTMF signal matches the transmitted DTMF service selection signal. A first step of pressing a dial button in response to voice guidance;
A second step of storing the pressed dial number in a memory;
A third step of reading the dial number and generating a DTMF service selection signal;
A fourth step of superimposing the DTMF service selection signal and the voice guidance signal;
A fifth step of detecting the DTMF signal from the superposed signal at predetermined time intervals;
A sixth step of determining whether the detected DTMF signal matches the generated DTMF service selection signal;
If the detected DTMF signal matches the generated DTMF service selection signal, the dial number is deleted from the memory, and the transmission of the DTMF service selection signal to the service terminal is stopped, while the detection If the generated DTMF signal does not match the generated DTMF service selection signal, the service using terminal control method is characterized by repeating the first step to the sixth step.   A signal obtained by attenuating the voice guidance signal output from the 2-wire to 4-wire conversion circuit by a first attenuation amount is superimposed on a signal obtained by attenuating the DTMF service selection signal by a second attenuation amount. The service using terminal control method according to claim 7. The first attenuation amount is reflected by the 2-wire to 4-wire conversion circuit and is at the same level as the voice guidance signal received by the service providing terminal. is an attenuation amount to attenuate the guidance signal, the second attenuation is line loss between the service terminal and the service providing terminal, the DTMF signal from the said superimposition signal in the fifth step 9. The service using terminal control method according to claim 8, wherein detection is performed. 8. The fourth step according to claim 7 , wherein in the fourth step, the DTMF service selection signal output from the 2-wire to 4-wire conversion circuit and the voice guidance signal output from the DC loop circuit are superimposed. Service usage terminal control method.   11. The service using terminal control method according to claim 10, further comprising a step of amplifying the superimposed signal at a predetermined amplification factor, and in the fifth step, the DTMF signal is detected from the amplified signal.

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