KR0120014B1 - Free dial device & method of wireless phone - Google Patents

Abstract

An apparatus and method for dialing in a wireless telephone is disclosed. The apparatus for dialing in the wireless telephone comprises: a receiver(1) for receiving an audio signal and data from the wireless telephone; a carrier detector(2) for detecting a carrier signal from the receiver; a transmitter(3) for transmitting the audio signal and the data to the wireless telephone; a signal level comparator(15) for comparing a signal level received from the receiver with a reference signal level; and a central processing unit(7) for controlling a dial circuit over a transistor(TR12). The apparatus and method for dialing in the wireless telephone may improve the convenience of the wireless telephone.

Description

Free Dialing Device and Method of Cordless Telephone

1 is a block diagram of a fixed device of a conventional wireless telephone.

2 is a block diagram of a fixing device for a radiotelephone according to the present invention.

3 is a flowchart illustrating a freedial process of a radiotelephone according to the present invention.

* Explanation of symbols for main parts of the drawings

ANT1: Antenna 1: Receiver

2 carrier detecting unit 3 transmitting unit

4: analog switch 5, 11, 12, 13: amplifier

6: speaker 7: CPU

8 dial circuit 9 keypad

10: CO line interface 14: handset

15: field strength comparison unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone, and more particularly, to a free dial apparatus and method of a wireless telephone for dialing using both a portable apparatus and a fixed apparatus when a call is made through a portable apparatus.

The fixing device of the conventional radiotelephone includes a receiver 1, a carrier detector 2, an amplifier 5, 11, 12, 13, a transmitter 3, an analog switch 4 and a speaker as shown in FIG. (6), CPU 7, dial circuit 8, keypad 9, trunk line interface 10, handset 14, and transistor TR1. The receiver 1 receives a voice signal and data from the portable device (not shown in the figure) via the antenna ANT1, outputs the data to the CPU 7 side through the output B, and simultaneously outputs the voice signal. Output to switch 4 side. The carrier detector 2 detects a carrier applied from the receiver 1 and outputs carrier detection information to the CPU 7 through the output terminal A, and the transmitter 3 is supplied from the CPU 7 through the input terminal C. The data is transmitted to the portable device via the antenna ANT1, and at the same time the audio signal supplied from the analog switch 4 is transmitted to the portable device. The trunk line interface 10 is for matching trunk lines. The trunk line interface 10 outputs the trunk line tone and the voice signal supplied from the trunk line to the analog switch 4 through the amplifying unit 11, and the voice applied from the analog switch 4 at the same time. A signal and a DTMF signal applied from the dial circuit 8 are output to the trunk line side. The handset 14 outputs the transmission audio signal to the analog switch 4 side through the amplifier 13 and amplifies the audio signal applied from the analog switch 4 to the speaker 6 side. The CPU 7 controls the overall operation of the fixing device, and the transistor TR1 controls the operation of the dial circuit 8 in accordance with a control signal applied from the output terminal D of the CPU 7. The dial circuit 8 operates under the control of the transistor TR1, generates a DTMF signal according to the dial button input from the keypad 9, and outputs the DTMF signal to the CO line interface 10 side.

The fixing device of such a cordless phone operates as follows. First, when the call request data transmitted from the portable device is received by the receiver 1, the receiver 1 transmits the received corresponding data to the CPU 7 side through the output terminal B. FIG. When the CPU 7 receives data, the CPU 7 connects the portable device to the trunk line, and the trunk line interface 10 transmits the transmission sound from the trunk line to the transmitter 3 through the amplifier 11 and the analog switch 4. The transmitter 3 then transmits the dial tone to the portable apparatus. Then, when the portable device receives the dial tone from the fixed device and dials the telephone number, the receiver 1 receives the DTMF signal from the portable device and outputs it to the trunk line through the analog switch 4 and the trunk line interface 10. To call the other party.

When the portable device is busy, the CPU 7 outputs a low level control signal to the base terminal of the transistor TR1 through the output terminal D, whereby the transistor TR1 is at a high level on the input terminal E side of the dial circuit 8. By applying a control signal of, the dial circuit 8 is made inoperable, thereby making the dialing operation impossible in the fixing device. In addition, when the portable device is not in a call, the CPU 7 outputs a high level control signal to the base terminal of the transistor TR1 through the output terminal D, whereby the transistor TR1 input terminal of the dial circuit 8. By applying a low level control signal to the E side, the dial circuit 8 is operated to enable dialing operation in the fixing device.

As described above, when a conventional wireless telephone uses a mobile device to make a call, the user dials using only the mobile device. Therefore, the user puts the handset of the mobile device on the ear and audibly confirms whether a dial tone is received. Since the dial is removed from the dial, there is a problem that a cumbersome operation must be performed in the dialing operation.

The present invention has been made to solve the above-described problems, the keypad of the fixed device in a state that the user is holding the mobile device to the ear by enabling the dialing by using both the mobile device and the fixed device when making a call through the mobile device It is an object of the present invention to provide a free-dial apparatus and method for a radiotelephone capable of dialing by using a radiotelephone to improve the usability of the radiotelephone.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a fixing device for a radiotelephone according to the present invention, and FIG. 3 is a flowchart illustrating a freedial process of the radiotelephone according to the present invention.

The fixing device of the radiotelephone according to the present invention includes a receiver 1, a carrier detector 2, an amplifier 5, 11, 12, 13, a transmitter 3 and an analog switch 4 as shown in FIG. ), A speaker 6, a CPU 7, a dial circuit 8, a keypad 9, a trunk line interface 10, a handset 14, a transistor TR1, and a field strength comparator 15. . Since the circuit configuration of FIG. 2 is similar to that of FIG. 1, the description of the functions of the same circuit components is omitted. However, in the circuit configuration of FIG. 2, the electric field strength comparator 15 is further provided. The electric field strength comparator 15 is a field strength level and a reference electric field strength level of a signal received from the portable apparatus through the receiver 1. Are compared and the comparison result information is output to the CPU 7 side through the output terminal F.

A radiotelephone equipped with such a fixing device performs free dialing in the order shown in FIG. In the standby state of the CPU 7 (step 40), the call button of the portable device is input, the portable device sends out the carrier, and the carrier from the portable device is detected by the carrier detection unit 2 and the CPU 7 When carrier detection data is supplied (step 41) and call request data from the portable device is supplied to the CPU 7 via the reception unit 1 (step 42), the call is approved to the portable device side via the transmission unit 3. Data is sent (step 43). At this time, when the portable device receives the call approval data from the fixed device, the mobile device and the fixed device call path are connected (step 44), and the ring tone coming from the trunk line is transmitted to the trunk line interface 10, amplifying unit 11, and analog. It is sent to the portable device side through the switch 4 and the transmitter 3, and is output to the user through the portable device speaker. Thereafter, the CPU 7 checks whether or not the received field strength level applied from the field strength comparison unit 15 is equal to or greater than the reference field strength level (step 45). When the received field strength level is higher than or equal to the reference field strength level (ie, when the separation distance between the portable device and the fixed device is small), the CPU 7 outputs a high level control signal to the base terminal of the transistor TR1 through the output terminal D. (Step 46), the transistor TR1 is operated to apply a low level control signal to the input terminal E of the dial circuit 8, thereby making the dial circuit 8 usable (step 47). Can be dialed using both the keypad of the portable apparatus and the keypad 9 of the fixing apparatus (step 48). In addition, when the received field strength level is not equal to or greater than the reference field strength level (that is, when the separation distance between the portable device and the fixed device is large), the CPU 7 outputs a low level to the base end of the transistor TR1 through the output terminal D. The control signal is output (step 49), the transistor TR1 is deactivated, and a high level control signal is applied to the input terminal E of the dial circuit 8, thereby making the dial circuit 8 unusable (step 50). At this time, the user can dial using only the keypad of the portable apparatus (step 51). Then, the CPU 7 changes the radio channel (step 52) after changing the radio channel when the carrier from the portable device is not detected in step 41 and when the call request data from the portable device is not received in step 42 (step 52). Return to the state.

As described above, the present invention recognizes the separation distance between the portable device and the fixed device according to the received electric field strength level from the portable device when a call is made through the portable device. Since the CO line can be dialed using both the and the fixed device, the user can dial using the keypad of the fixed device while checking the dial tone and the dial tone through the portable device, thereby improving the convenience of using the wireless telephone.

Claims (2)

A fixed device including a receiver for receiving voice signals and data from a portable device, a carrier detector for detecting a carrier applied from the receiver and outputting a carrier detection signal, and a transmitter for transmitting voice signals and data to the portable device side; In the radiotelephone comprising: a field strength comparison unit for outputting an electric field strength signal by comparing the electric field strength level and the reference electric field strength level of the signal applied from the receiving unit, the carrier detection signal is applied from the carrier detector At the same time, when the electric field strength signal is applied from the electric field strength comparator, when the electric field strength signal is read and judged that the distance to the portable device is close, the dial circuit connected to itself through the transistor is operated to dial by using the dial circuit. Obtain a CPU to control Pre-dial device of the wireless telephone, characterized in that. A dialing method of a radiotelephone, the method comprising: a first step of determining whether or not a carrier from a portable device is received in a standby state, and when the fixed device receives a carrier from the portable device in the first step, A second step of determining whether or not call request data is received; a third step of changing a radio channel and returning to a standby state if the fixed device does not receive a carrier from the portable device in the first step; If the fixed device does not receive the call request data from the portable device in the process, the fourth step of changing the radio channel and returning to the standby state; if the fixed device receives the call request data from the portable device in the second step, the portable device A fifth process of sending call approval data to the side and connecting a call path with the portable device, and after the fifth process, the fixing device is portable Step 6 for determining whether the received field strength level from the device is equal to or greater than the reference field strength level, and in the sixth step, the fixing device uses its own dial circuit when the received field strength level is greater than the reference field strength level. Step 7 to enable the dialing using both the keypad of the mobile device and the keypad of the portable device, and in the sixth step, the fixing device uses its own dial circuit when the received field strength level is less than the reference field strength level. And an eighth step of disabling the dialing using only the keypad of the portable apparatus.