KR19980035372A - Communication terminal with automatic continuous redial - Google Patents

Abstract

The present invention relates to a communication terminal having an automatic continuous redial function capable of repeatedly redialing until a call connection is made with a called party. The present invention relates to an operation of a trunk line connection port and an entire apparatus for connecting a trunk line. Communication terminal comprising a control means for controlling and a call path connecting means for controlling connection to a call path in accordance with a predetermined control signal from the control means and a DTMF signal generating means for transmitting a DTMF signal corresponding to a digit pressed by a user A function selecting means for selecting an automatic continuous redial function, and mode storing means for storing, as predetermined flag data, that the function is selected when the automatic continuous redial function is selected through the function selecting means, the trunk line Detecting the transmission tone applied through the connection port and outputting the detection signal of the first level And a ring tone detecting means for detecting a ring tone through the trunk line connection port and outputting a predetermined detection signal when the ring tone is input through the trunk line connection port, wherein the control means comprises the call path according to the data level set in the mode storing means. It is characterized in that the automatic redialing is repeatedly performed until the ring tone is detected by the ring tone detecting means while periodically turning on / off the connecting means.

Description

Communication terminal with automatic continuous redial

The present invention relates to a communication terminal used to connect to a public switched telephone network (PSTN), and in particular, an automatic continuous redial that allows repeated redialing until a call connection is made with a called party. It relates to a communication terminal with a function.

The telephones, which are widely used throughout our living spaces, including general homes and businesses, are the most basic necessities of modern people in the information age. Recently, the telephone functions as a simple telephone equipment that has been conventionally provided for this role. Increasingly, more efficient and convenient functions using microprocessors are being added to telephones.

1 is a block diagram showing an internal configuration of a general telephone with a built-in microprocessor. In the drawing, reference numeral 1 is a trunk line connecting port for connecting an external trunk line, and 2 is applied through this trunk line connecting port 1. A ring signal detecting unit for detecting a ring signal, 3 is a ring generating unit for outputting a ring tone on the basis of the applied ring signal, 4 is impedance matching with the other terminal (hereinafter referred to as a large country) and in the device Interface circuit that performs the interface function of overall communication signals.

In addition, reference numeral 5 denotes a handset, 6 denotes a communication path connection unit for controlling whether a communication path is connected according to a control signal from the microprocessor 12 which will be described later, and 7 denotes a communication path connection unit with the interface circuit 4. A network that amplifies the voice signal of the sender applied from the power station and the user's voice signal applied from the handset 5 to a predetermined level as well as performs signal processing for side tone through (6). Circuit.

Reference numeral 8 denotes a voice input unit for allowing a user to directly input voice through the microphone 8a installed on the surface of the phone case without passing through the transmitter 5a of the handset 5, and the voice input unit 8 Microphone 8a for converting a user's voice into an electrical signal, and a microphone interface circuit 8b for interfacing the signal output from the microphone 8a into the device.

On the other hand, reference numeral 9 is a voice output unit for directly outputting the voice signal transmitted from the power station through the speaker without passing through the handset 5b of the handset 5 according to the user's needs, the voice output unit 9 is A speaker amplification interface circuit 9c for interfacing a voice signal applied from the speaker phone driver 15 to be described later, a buffer 9b for amplifying a signal output from the interface circuit 9c, and this buffer 9b. The speaker 9a converts and outputs the signal output from the audio into a predetermined level of audible sound.

Reference numeral 12 is a microprocessor for controlling the operation of the overall apparatus. When the user picks up the handset 5, it detects it and drives the communication line connection 6 on to form a loop.

On the other hand, reference numeral 10 is a display unit to inform the user of the current operation state of the phone, 11 is a memory for storing data necessary for normal operation of the phone, such as a speed dial function, 15 is the network circuit 7 and the voice It is a speaker phone driving unit that processes audio signals exchanged between the input and output units 8 and 9 according to the input and output types.

Reference numeral 13 denotes a keypad provided with numeric keys and function keys used for dialing or performing a specific function by the user, and 14 denotes the microprocessor 12 for a predetermined key input entered through the keypad 13. The DTMF generation circuit outputs a DTMF (Dual Tone Multi-Frequency) signal corresponding to the control command.

That is, the conventional general telephone having the above-described configuration has a telephone number storage function for storing a telephone number entered in advance, in addition to a normal call function with a correspondent, and selects a user's specific key based on the stored telephone number. It is possible to provide a speed dial function for automatically dialing and a speaker phone function for making a call using the microphone 8a and the speaker 9a without lifting the handset.

In addition, when a user dials a specific subscriber number for urgent business, but the corresponding subscriber is in a busy state, the user can easily recall the subscriber number without redialing the corresponding subscriber number through the redial function. However, in order to select the redial function, the hook switch must be turned on / off once again to check the dial tone (DT), and then the ring back tone (RT) is heard after pressing the redial button. It should be noted that even if the user is busy with other tasks, even this set of key manipulations and confirmation of the dial tone may be cumbersome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a communication terminal having an automatic continuous redial function capable of repeatedly redialing until a call connection is made with a called party.

1 is a block diagram showing the internal structure of a general telephone incorporating a microprocessor.

Figure 2 is a block diagram showing the internal structure of the telephone with an automatic continuous redial function according to an embodiment of the present invention.

3 is a flow chart for explaining the operation of the device of the configuration of FIG.

*** Explanation of symbols for main parts of drawing ***

1: trunk line connection port 2: ring signal detector

3: ring generator 4: interface circuit

5: handset 5a: handset

5b: handset 6: a communication line connection

7: network circuit 8: voice input unit

8a: microphone 8b: microphone interface

9: audio output unit 9a: speaker

9b: buffer 9c: speaker amplification interface

10: display unit 10a: light emitting display unit

10b: display driver 11: memory

12 microprocessor 13 keypad

14: DTMF (Dual Tone Multi-Frequency) Generation Circuit

15: speakerphone driver 20: flag register

21: dial tone detector 22: ring tone detector

BF1 to BF8: Bidirectional buffer

A communication terminal having an automatic continuous redialing function according to the present invention for realizing the above object comprises a control means for controlling the operation of the trunk line connecting port for connecting a trunk line and the apparatus as a whole, and according to a predetermined control signal from the control means. A function selecting means for selecting an automatic continuous redial function in a communication terminal having a call path connecting means for controlling whether a call is connected or a DTMF signal generating means for transmitting a DTMF signal corresponding to a digit pressed by a user. And a mode storing means for storing, as predetermined flag data, that the function is selected when the automatic continuous redial function is selected through the function selecting means, and detecting a first level by detecting a dial tone applied through the trunk line connection port. Dial tone detection means for outputting a signal, the ring tone is input through the trunk line connection port And a ring tone detecting means for detecting this and outputting a predetermined detection signal, wherein the control means is provided by the ring tone detecting means by periodically turning on / off the communication line connecting means according to the data level set in the mode storing means. The automatic redialing is repeatedly performed until a ring tone is detected.

That is, according to the present invention having the above-described configuration, the control means sets the state flag inside the mode storage means to a predetermined level according to whether the automatic redialing function is selected by the user, and detects the ring tone based on this. Periodically, redialing is automatically performed while the call connection means is controlled on / off until a ring tone is detected by the means.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a telephone having an automatic continuous redialing function according to an embodiment of the present invention. The same reference numerals are used for components that perform substantially the same functions as the configuration shown in FIG. The detailed description thereof will be omitted.

In FIG. 2, reference numeral 13 denotes a keypad additionally provided with an automatic continuous redial function selection button according to the present invention, and 20 is a flag register for storing, as predetermined flag data, that the automatic continuous redial function is selected by a user. Is a dial tone detection unit that detects a dial tone (DT) applied through the trunk line connection port 1 and outputs a high level detection signal, for example.

In addition, reference numeral 22 denotes a ring tone detection unit for detecting a ring tone after inputting the ring back tone (RT) through the trunk line connecting port 1 and outputting a predetermined detection signal, and the reference numeral 12 denotes the flag register 20. A microprocessor as a control unit for controlling the operation of the entire apparatus for the automatic continuous redialing function according to the set data level.

Next, the operation of the device having the above configuration will be described with reference to the flowchart shown in FIG. 3.

If the user dials a specific subscriber number but is not connected for the reason that the subscriber is busy, if the user selects a function key (not shown) provided in the keypad 13 (ST 1), the microprocessor 12 The state flag of the flag register 20 is changed and set from the state of '0' to the state of '1' (ST 2).

On the other hand, when the microprocessor 12 confirms that the state flag of the flag register 20 has been switched to the state of '1' (ST 3), the microprocessor 12 controls the communication path connecting unit 6 to first open the communication path for a while. By turning off, the device enters the on-hook state and then turns the call back on to reset it to the off-hook state (ST 4).

Subsequently, the microprocessor 12 determines whether a dial tone (DT) transmitted from the exchange is received through the dial tone detecting unit 21 (ST 5). When the dial tone detection is confirmed, the memory ( 11) reads the subscriber number for redialing (ST 6), and transmits the DTMF signal corresponding to the corresponding subscriber number through the trunk line connection port 1 by driving control of the DTMF generation circuit 14 based on this. (ST 7).

Thereafter, the microprocessor 12 checks whether a ring back tone (RT) is applied from the exchange by the ring tone detection unit 22 as a result of redialing (ST 8), in which case the ring tone is received within a predetermined time. If not, this is because the called party is in a busy state, and then the microprocessor 12 outputs a message indicating that the called party is in a busy state through the display unit 10 (ST 10). Returning to step 3, the above redialing operation is repeated.

On the other hand, if a ring tone is detected by the ring tone detection unit 22 as a result of redialing, the microprocessor 12 controls the ring generator 3 to output a predetermined alarm sound indicating that the ring tone has been received. Allow the user to recognize that the telephone call is possible (ST 10), and then set the status flag of the flag register 20 to '0', and then perform a series of automatic redial functions performed by the above-described process. (ST 11).

That is, according to the above embodiment, the user can recognize that the user is in a callable state by repeatedly executing redialing until a call connection is made with the called party, and outputting a predetermined alarm sound when the redialing becomes a callable state. Will be.

Meanwhile, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention. For example, the above-described technology may be applied to a communication terminal such as a facsimile apparatus or a mobile terminal. Applicable

As described above, according to the present invention, the user simply freely selects a function key to repeatedly execute automatic redialing until the call is connected to the called party. It is possible to realize a communication terminal with an automatic continuous redial function that can handle other tasks.

Claims (2)

Control means for controlling the operation of the CO line connection port and the apparatus as a whole for connecting a trunk line, and correspond to the digits pressed by the user and the channel connection means for controlling whether or not the communication path is connected according to a predetermined control signal from the control means. In a communication terminal having a DTMF signal generating means for transmitting a DTMF signal to be Function selection means for selecting an automatic continuous redial function; A mode storing means for storing, as predetermined flag data, that the function is selected when the automatic continuous redial function is selected through the function selecting means; Dial tone detection means for detecting a dial tone applied through the trunk line connection port and outputting a detection signal of a first level; When the ring tone is input through the trunk line connection port is configured to include a ring tone detection means for detecting this to output a predetermined detection signal, The control means may perform automatic redialing repeatedly until the ring tone is detected by the ring tone detecting means while periodically turning on / off the channel connection means according to the data level set in the mode storing means. Communication terminal with automatic continuous redial function. The display apparatus according to claim 1, further comprising: display means for displaying an operating state of a called terminal; It further comprises an alarm sound output means for informing that the ring tone is detected by the call tone detection means, The control means controls to output a message notifying whether the called party is busy and the connection status with the called party through the display means and the alarm sound output means based on whether the ring tone is detected through the call tone detecting means. Communication terminal with automatic continuous redial function, characterized in that.