JPH0466425B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a system for performing reliable billing control in billing type terminal equipment connected to a telephone line to which no signal indicating a response from the other party arrives. [Prior Art] Generally, when a call is made by dialing through a public telephone line and the other party answers, a signal indicating the other party's response, such as a polarity inversion pulse, is sent out from the exchange, and this signal is assumed to arrive from the telephone line. In terminal equipment such as public telephones, charges are made in accordance with signals such as polarity reversal pulses. On the other hand, in some foreign countries, even if there are telephone lines connected to public telephones, signals such as polarity reversal pulses do not arrive at all when the other party responds, and in this case, conventional means may not be used. In some cases, billing becomes impossible, so special means are used to detect the other party's response. In other words, the transmitter of the calling party is kept inactive, the voice of the other party is detected using an amplified detector, etc., and the other party's response is judged, or the ring back tone is similarly detected, and this Generally, a method is used to determine that the other party has responded after a certain period of time has elapsed since the end of the detection, or a combination of the two is used. However, the signal coming from the telephone line is
In addition to the other party's voice and ring back tone, there are intercept sounds such as dial tone, busy tone, and talkie guidance. This creates drawbacks that cause unexpected damage to users. As a countermeasure to this problem, the applicant's separate application (Japanese Patent Application No. 186913/1982) has proposed that each unique frequency component contained in various signal tones arriving from the telephone line be individually detected. monitor the duration of
The system determines that the signal tone corresponds to this condition by the continuation of a specific frequency component for a predetermined period of time, and when none of the frequency components can be determined to be various signal tones, it is determined that it is the voice of the other party, and the response of the other party is detected based on this judgment. Proposed. [Problem to be solved by the invention] However, in some foreign countries that have adopted the method described in the separate application, the sound quality of the telephone line is poor, and even if the improved method described above is used, the noise cannot be heard by the other party. It may be mistakenly detected as a response voice. That is, since the above method determines that a signal that is not a specific frequency component is the voice of the other party, the response voice and noise are also determined using the same criterion. For this reason, if it is determined that it is the voice of the other party and charges are immediately made, there is a problem that if the determination is made incorrectly, an unfair amount of coins will be collected from the user. [Means for Solving the Problems] In order to solve such problems, the present invention has the following features:
As shown in FIG. 8, when the signal tone coming from the telephone line is determined to be a ringback tone in step S1, the fact that a ringback tone has been detected is stored in a storage device or the like. Next, in step S2, when it is determined that the signal sound coming from the telephone line is not a specific frequency component and is the voice of the other party, the user is allowed to make a call, but the call is not immediately charged, and the call is made for a certain period of time (7 seconds). ) starts the timer. Next, in step S3, it is determined whether or not the user has performed an on-hook within a certain period of time, and when the on-hook has been performed, the step
In S4, it is determined whether or not ring back tone detection has been memorized, and if it has been memorized, the step
Billing processing is performed in S5. If the ringback tone detection is not stored, the coins will be returned without charging, although this is not shown in the step. [Operation] When it is determined that the voice is from the other party, the user's call is allowed, but the user waits for 7 seconds, for example, without charging immediately. If a user is on-hooks during this time, it is determined whether or not to charge the user, taking into account the service provided to the user. That is, if the other party's voice is detected after the ringback tone is generated, there is a high possibility that the other party's voice is correctly detected, and there is a high probability that the call was made by the other party's response, so billing is processed and coins are stored. However, if the ring back tone had not occurred, there is a possibility that it was a false detection due to noise, and the user may have turned on hook because he or she could not hear the other party's voice, so there is a high probability that there was no mutual conversation.
Coins will be returned without charge. Note that if there is no call from the user within these 7 seconds, it will be treated as a call and billing will be performed and coins will be stored. [Example] Hereinafter, details of the present invention will be explained with reference to figures showing examples. Figure 2 is a block diagram of a public telephone, with line terminals L ₁ and L ₂ to which the telephone line from the exchange is connected.
In contrast, the switch HS ¹ and the receiving circuit (hereinafter referred to as
REC) 1, diode bridge (hereinafter referred to as DB)
2. Through a power supply circuit (hereinafter referred to as PS) 3 and a forced disconnection circuit (hereinafter referred to as CB) 4, a communication loop is formed and a communication circuit (hereinafter referred to as TKC) 5 having a transmitting amplifier and a receiving amplifier is connected. A transmitter T and a receiver R of the handset 6 are connected to this. In addition, a control unit (hereinafter referred to as CNT) 7 consisting of a processor such as a microprocessor (hereinafter referred to as CPU) and memory, etc. is provided, a frequency detection circuit (hereinafter referred to as FDT) 8, and a coin controller for sorting and storing coins. Control decisions are made according to the outputs of the processing unit (hereinafter referred to as CPS) 9, the dial key (hereinafter referred to as DK) 10, the switch switch HS ² , etc. ,MF)
MF signal generator (hereinafter referred to as MFG) that generates signals
13, TKC5, CB4, etc. In addition, MFG13 outputs DK10 and
In response to the control of CNT7, a permission signal is sent from CNT7.
Only when OK is given, it generates an MF signal according to the operation of the DK10, gives a control signal CS to the TKC5, sends the MF signal as a dial signal via the TKC5, and sends the monitoring information to the maintenance center, etc. When sending to CNT, MFG13
7, make a dial call to a specific destination such as a maintenance center in the same way as above, and then
Monitoring information is transmitted via the same route using MF signals. On the other hand, PS3 closes the DC loop via TKC5 by turning on the switch ^HS1 due to the off-hook, and as the loop current with a constant polarity passes through DB2, this charges the capacitor. The terminal voltage of is used as a power supply V to be supplied to each part. Therefore, in the first loop method, when off-hook is performed, the DC loop is closed, and
CNT7 according to the output of CPS9 by inserting a coin
Since the DK 10 sends an OK signal, dialing can be made using the DK 10, and when the other party responds, the call can be made freely. However, even if the other party answers, billing signals such as polarity reversal pulses do not arrive on this telephone line, and in order to detect the other party's response, REC1 using a transformer etc.
the incoming signal from the telephone line given through
The FDT 8 detects each frequency component, and the CNT 7 monitors whether this detection output D _f continues for a predetermined period of time. Depending on the result, the CNT 7 detects various signal tones and the other party's voice. After judging the other party's voice, it detects the other party's response, controls the CPS9 accordingly, stores the coin, eliminates the mute signal MUT for the TKC5, and turns off the transmitter T. While canceling the inoperable state, if the coins inserted and waiting become insufficient, CB4 is controlled to open the DC loop for a certain period of time, restore the exchange, and forcibly disconnect the call. In addition, depending on the DP12, while the CNT7 sequentially displays the coin insertion and accumulation status, the CNT7 has a self-diagnosis function, and performs self-diagnosis according to the output of the hook switch HS ² in response to off-hook.
It detects that the storage safe in the CPS 9 is full, coins are jammed, the handset 6 is disconnected due to theft, etc., and accordingly, the DP 12 displays an indication that the device cannot be used.
The above-mentioned monitoring information is transmitted. In addition, the FDT8 has a minimum detection level for each frequency component that can be varied by the control signal CL.
The CNT 7 controls the FDT 8 according to conditions, and successively sets the minimum detection level to a desired value. In addition, a busy tone generator (hereinafter referred to as BTG) 14 that locally generates a busy tone is provided.
The BTG 14 transmits a local busy tone to the receiver R of the handset 6 via the transformer T.
to notify the user that calls are not possible. Figure 3 is a block diagram of the FDT8, including a preamplifier (hereinafter referred to as HA) 21 and a fixed attenuator (hereinafter referred to as HA).
PAD) 22, variable attenuator (hereinafter referred to as ATT) 23,
A limiting amplifier (hereinafter referred to as LA) 24, a PAD 25, selection amplifiers (hereinafter referred to as SA) 26 1 to 26 8 each having an individual selection frequency, and Schmitt amplifiers 26 ₁ to 26 ₈
Amplified detector (hereinafter referred to as AD) with a built-in trigger circuit
27 ₁ to 27 ₈ constitute the main system, which are integrated circuits, and PAD22, ATT
In 23, the insertion attenuation can be freely set using switch circuits (hereinafter referred to as ASW) 28 ₁ to 28 ₄ such as analog switches, and when all of the ASW 28 ₁ to 28 ₄ are off, the insertion attenuation is 0 dB, and the ASW 28 ₁ When only ASW28 2 is on, the attenuation is 5 dB, when only ASW28 ₂ is on, the attenuation is 10 dB, when only ASW28 ₃ is on, the attenuation is 20 dB, and when only ASW28 ₄ is on, the attenuation is 30 dB. Control signal from CL ₁ to _{CL 4} minimum detection level (hereinafter referred to as
_{FDT is}
It is possible to set the LDL for each of the 8 frequency components. Also, the insertion attenuation of PAD22 and ATT23 is
At 0dB, LDL is − at the input of HA21.
55 dBV, and LDL is determined in 5 dB steps between -55 dBV and -20 dBV by the combination of each insertion attenuation amount of PAD25 and ATT23,
For control purposes by CNT7, the following code is assigned to each LDL.

[Table] On the other hand, in this case, the various signal tones arriving from the telephone line uniquely contain each of the frequency components shown in the table below, and the optimal LDL for each detection has the relationship shown in the table below. It's summery.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, even if a voice other than the other party's voice is determined to be voice, if on-hook is performed within a certain period of time while the timer is operating, if there is no memory of RBT detection, This is particularly noticeable in various terminal devices such as public telephones and facsimile machines that are connected to telephone lines that do not receive a signal indicating a caller's response and that charge using coins, toll cards, etc. You can get the following effect.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a flowchart of voice processing, Fig. 2 is a block diagram of a public telephone, Fig. 3 is a block diagram of FDT, and Fig. 4 is a comprehensive judgment and control situation. 5 to 7 are flowcharts showing the lower routine of FIG. 4, and FIG. 8 is a flowchart corresponding to the present invention. 1...REC (reception circuit), 7...CNT (control unit),
8...FDT (frequency detection circuit), 22...PAD
(fixed attenuator), 23...ATT (variable attenuator), 2
6 ₁ ~ 26 ₈ ...SA (selection amplifier), 27 ₁ ~ 27 ₈ ...
...AD (amplification detector), 28 ₁ ~ 28 ₄ ... ASW (switch circuit), L ₁ , L ₂ ... line terminal, D _f , D _f1 ~
D _f8 ...Detection power, CL, CL ₁ to CL ₄ ...Control signal.

Claims (1)

[Claims] 1. Connected to a telephone line where no signal indicating a response from the other party arrives, and detecting each unique frequency component contained in various signal tones coming from this telephone line,
The duration of each detection output is monitored, and when a specific frequency component continues for a predetermined period of time, it is determined that the signal tone corresponds to this condition.If none of the frequency components can be determined to be the various signal tones, it is determined to be the response voice of the other party. However, in a billing control method for billing terminal equipment that detects the other party's response based on this judgment and charges based on the detection of the other party's response, when the incoming signal sound is determined to be a ringback tone, the ringback tone is The detection is memorized, and when the response of the other party is detected, the user's call is allowed, and a timer for a certain period of time is started, and when the user goes on-hook within the certain period of time, the ring is activated. A billing control system characterized in that billing is performed when there is memory of back tone detection, and billing is not performed when there is no memory of ring back tone detection.