KR950007499B1 - The cordless phone having multi-handset and the operating method thereof - Google Patents

Abstract

In the multi-type cordless telephone composed of a fixed equipment and several portable equipments, the method indicates line's busy to other portable equipments when one of portable equipments communicates with fixed equipment. This method prevents other portable equipments intervening in communication. The fixed equipment(10) and the portable equipments(20) consist of a micom(8), a tone generator(9), a receiver(11), a tone detector(17), a tone eliminator(18) and a display(19).

Description

Multi-type wireless telephone and its operation method

1 is a block diagram showing a conventional multi-type wireless telephone.

2 is a block diagram of a conventional multi-type wireless telephone, in which (a) is a block diagram of a fixing device, and (b) is a block diagram of a portable device.

3 is a multi-type wireless telephone according to the present invention, (a) is a block diagram showing a fixing device, (b) is a block diagram showing a portable device.

4 is a schematic diagram showing the use of the fixing device and the portable device.

5 is a flow chart for realizing a method of operating a multi-type wireless telephone according to the present invention, (a) is a flow chart for explaining the operation of the fixed device, (b) a flow chart for explaining the operation of the portable device, (c) is a flowchart for explaining another embodiment of (b).

* Explanation of symbols for main parts of the drawings

1,11 receiver 2,12 frequency synthesizer

3,13 Transmitter 4 Line Connection

5: Dial generator 6,14: Key input unit

7,15: ID switch 8,16: Microcomputer

9: tone generator 17: tone detection unit

18: tone removing unit 19: display unit

10: fixing device 20: portable device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-type wireless telephone, and more particularly, in a multi-type wireless telephone composed of a fixed device and a plurality of mobile devices, when one of a plurality of mobile devices is in communication with the fixed device, the other mobile device is informed that the other mobile device is busy. The present invention relates to a multi-type wireless telephone and a method of operating the same, which prevents a device from occupying a wireless channel to prevent cross channel interference.

In general, the multi-type radiotelephone is configured to communicate with other subscribers through the fixed device 10 and the plurality of portable devices 20 wirelessly within a predetermined distance as shown in FIG. 1 and detailed block diagrams thereof. Is shown in FIG.

The fixing device 10 receives and demodulates a radio signal transmitted from the portable device 20 and applies the extracted control data to the microcomputer 8 as shown in FIG. 4) from the receiver 1 to be applied to the receiver, the frequency synthesizer 2 for combining the carrier frequency of the transmitter 3 and the receiver frequency of the receiver 1 under the control of the microcomputer 8, and the microcomputer 8 from the microcomputer 8; The transmitter 3 modulates the applied control data and the voice signal applied from the line connection unit 4 and transmits it through the antenna ANT, and a line connection unit connected to other subscribers through the trunk line L1 and L2. (4), a dial generator (5) for generating a dial signal by the control signal of the microcomputer (8) and outputting it to the trunk line (L1) (L2) side through the line connecting portion (4), and the fixing device (10). Key input unit (6) for realizing various functions of ID switch 7 and microcomputer 8 for controlling the overall operation of the fixing device.

In addition, the portable apparatus 20 applies the control data extracted by receiving and demodulating the signal transmitted from the fixing apparatus 10 to the microcomputer 16 as shown in FIG. A frequency synthesizer 12 for synthesizing the receiver 11 to be applied to the receiver 11, the speaker SP for outputting the audio signal applied from the receiver 11, and the reception frequency of the receiver 11 and the carrier frequency of the transmitter 13; ), A transmitter 13 for modulating and transmitting a voice signal applied through the microphone MIC and the control data generated by the microcomputer 16, and a key input unit for realizing various functions of the portable apparatus 20 ( 14), an ID switch 15 for setting an ID number for preventing telephone theft of the outside, and a microcomputer 16 for controlling the overall operation of the portable apparatus.

In the conventional multi-type wireless telephone configured as described above, when a specific portable device of the plurality of portable devices 20 occupies the radio channel of the fixed device 10, the other portable device transmits status information about the system from the fixed device 10. Since there is no sequence, the state of the system is unknown.

Therefore, when one mobile device and the stationary device 10 are in a call and another mobile device transmits a radio signal to the stationary device 10 in order to attempt a call, the mobile device is in a call state in the case of a single channel method. In the case of a frequency sharing method, a crosstalk is caused, and the radio channel occupancy fails to be transmitted through the speaker SP.

That is, when a specific portable device among the plurality of portable devices 20 occupies the wireless channel of the fixed device 10, the other portable device cannot recognize the state of use and cause interference with the portable device being used or do not occupy the wireless channel. There was a problem that failed.

The present invention has been made to solve this problem, when one of the plurality of portable devices are talking to the fixed device to inform that the fixed device is on the other mobile device side to prevent the other mobile device from occupying the radio channel The purpose is to prevent interference of radio channels.

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

(A) and (b) of FIG. 3 is a block diagram showing the fixing device 10 and the portable device 20 according to the present invention. In the multi-type radiotelephone comprising the fixing device 10 and the portable device 20, Tone generator 9 for generating a pilot tone having a frequency band outside the voice band by the control signal of the microcomputer 8 to inform the state of use of the portable device, and the tone generator 9 received through the receiver 11. The tone detection unit 17 for detecting the pilot tone of the tone, the tone removing unit 18 for converting the detected pilot tone into the warning sound through the speaker SP, and whether the pilot tone is detected by the control signal of the microcomputer 16; It is comprised by the display part 19 for displaying outside.

The operation of the multi-type wireless telephone apparatus according to the present invention configured as described above will be described with reference to FIGS. 4 and 5 as follows. When a specific portable device among the plurality of portable devices 20 attempts to make a call by occupying the wireless channel of the fixed device 10, the microcomputer 16 of FIG. 3 transmits a call signal input through the key input unit 14. It is sent to the fixing device 10 side through the 13 and the receiving unit 1 of the fixing device 10 receives it and applies it to the microcomputer 8.

At this time, the microcomputer 8 detects the received signal and transmits a call answering signal to the transmitter 3 and simultaneously controls the tone generator 9 to generate a pilot tone having a frequency band outside the voice bandwidth. Accordingly, the pilot tone is broadcasted and applied to each portable device as shown in FIG. 4, and the portable devices in the standby state recognize that the system is in use and display the state on their display unit 19 at the same time. Done.

At this time, if the user wants to occupy the radio channel of the fixed device 10 through another portable device, the portable device recognizes that the system is in use by the pilot tone, and immediately sends out a warning sound through the speaker SP. Attempt to occupy the radio channel is prevented. That is, by notifying the user of the system status, the portable device in use can be prevented from transmitting interference and unnecessary radiation.

The above-described series of operations are performed in the same order as in FIG. 5, where the fixing device 10 operates in the same order as in FIG. 5A, and the portable device 20 is in the same order as in FIG. 5B. It works.

First, when the stationary device 10 receives a call signal requesting a call from one of the plurality of portable devices 20 (step 51), the pilot device transmits a call response signal to the portable device and has a frequency band outside the voice bandwidth. Is generated and transmitted (steps 52 and 53), and when the call is terminated and a call termination signal is received from the portable apparatus (step 54), the transmission of the pilot tone is stopped (step 55).

Further, the portable device 20 checks whether the display unit 19 indicates that the system is in use (step 61), and if it indicates that the system is in use, determines whether or not the pilot tone from the fixing device 10 is detected. Check (step 62), if a pilot tone is detected, display on the display unit 19 that the system is in use (step 63), and then confirm whether or not a call is attempted by operating the key input unit 14 (step 64), If a call is attempted, a warning sound is issued to warn the user not to attempt a call, and then the flow returns to step 62 (step 65). When the portable apparatus 20 does not indicate that the system is in use on the display unit 19 in step 61, the portable apparatus 20 checks whether or not a call is attempted by operating the key input unit 14 (step 67). Transmitting a call signal to the (10) side (step 68), confirms whether or not a call response signal from the fixing device 10 is received (step 69), and proceeds with a call when a call answer signal is received (step 70). When the call ends (step 71), the call end signal is transmitted to the fixing device 10 (step 72). The portable apparatus 20 returns to step 61 after not indicating that the system is in use on the display unit 19 when no pilot tone is detected in step 62 (step 66). Returning to 62, if the call answering signal is not received in step 69 returns to step 62.

In this embodiment, when the stationary device 10 and the portable device 20 implement a call distance separation detection function using a squelch circuit that determines the presence or absence of a carrier signal in a call mode, a pilot tone detection method may be used. . That is, as shown in (c) of FIG. 5, the portable device 20 receives the call response signal from the fixing device 10 and checks whether or not the pilot tone is detected while talking to the fixing device 10 (step). 75), if a pilot tone is detected, the display unit 19 indicates that the system is in use (step 77), then confirms whether or not the call is terminated (step 78), and if the call ends, returns to the fixing device 10 side. The call termination signal is transmitted (step 79). Further, in step 75, if the pilot tone is not detected even after 10 seconds have elapsed when the pilot tone is not detected (step 76), the portable device 20 transmits a call end signal to the fixed device 10 (step 76). 79) The operation ends. Therefore, in this case, the portable device 20 cannot use the system unless the pilot tone is detected out of the call radius while talking with the fixed device 10.

In more detail, such an operation process is performed while one of the plurality of portable devices 20 is in communication with the fixed device 10 and the other portable device displays the system use state through the display unit 19. At this time, if the user of the other portable device to operate the key input unit 14, the portable device sends a warning sound to the user to prevent attempts to occupy the radio channel.

On the contrary, when the display unit 19 of the portable device 20 is turned off, the user can use the system. At this time, when the call key is pressed for the use of the system, the call signal is transmitted to the fixing device 10 and the fixing device ( 10) the call response signal from the mobile device 20 is transferred to the mobile device 20, and the call is completed. Then, when the call is completed, the call termination signal is transmitted to the fixed device 10 to stop the pilot tone generation of the fixed device 10. Let's go.

As described above, in the multi-type wireless telephone apparatus having a plurality of portable devices, when the stationary device is in communication with one mobile device, it informs that the other mobile device is busy and the other mobile device occupies the radio channel. The effect of preventing interference and unwanted radiation can be achieved.

Claims (4)

In a multi-type wireless telephone having a fixed device and a plurality of portable devices, the fixed device controls the control of the microcomputer 8 in order to inform the portable device that the mobile device is not in a call when the phone is in communication with one of the portable devices. And a tone generator 9 for generating a pilot tone having a frequency band outside the audio signal bandwidth and transmitting it through the transmitter 3 and the antenna ANT; Each of the portable devices includes a tone detector 17 for detecting the pilot tone received through the receiver 11 from the fixed device, and converts the pilot tone supplied from the tone detector 17 into an alert sound to generate a speaker SP. To the tone removing unit 18 and the microcomputer 16 receiving the pilot tone detection information from the tone detecting unit 17, indicating whether or not the call of another portable device is controlled according to the control of the microcomputer 16; And a display unit (19). A method of operating a multi-type wireless telephone, comprising: a first process of transmitting a call signal to a fixed device side to request a call by one of the portable devices; and the fixed device after the first process is performed by the portable device. Receiving a call signal from one of the portable devices, transmitting a call response signal to the portable device requesting the call and transmitting a pilot tone to notify the other portable device of the call; A third process in which the mobile device requesting the call receives a call response signal from the fixed device, and another mobile device not requesting the call after the second process receives a pilot tone from the fixed device during the call. Display a visual confirmation that a key is present and output a beep when the user's key input is operated. A fourth process of preventing attempts; and a fifth process of transmitting the call end signal to the fixed device by the portable device requesting the call after the third process; and, after the fifth process, the fixed device terminates the call. And receiving a sixth step of stopping transmission of the pilot tone. The method of claim 2, wherein the bandwidth of the pilot tone is set outside the voice signal bandwidth. The multi-type wireless telephone of claim 2, wherein, in the third process, the portable device transmits a call end signal to the fixed device when a pilot tone is not detected for a predetermined time out of a call radius during a call. How to operate.