KR100258154B1 - Apparatus for isolating cut-off sound at time of ending call in cordless phone and method therefor - Google Patents

Abstract

PURPOSE: A device and a method for obstructing a cut-off sound is provided to satisfy a user by substituting an uncomfortable finish sound with non-sound or a fixed sound in the time of finishing a call in a mobile telephone. CONSTITUTION: When a control part senses a call finish request, the control part obstructs a channel by outputting a cut-off signal for controlling switches in an MSK modem(412). After a fixed time passes, the control part forms the channel again by outputting a form signal, and outputs a control signal for transmitting a call finish message to the MSK modem(414). Holding for the fixed time is for inducing a partner side to finish a call by offering non-sound. At this time, the call finish message is transmitted to a terminal of a partner side, but the partner side is not an uncomfortable sound because the terminal of the partner side is finished.

Description

Cut-off sound cutoff device and method at the end of a call in a wireless telephone

The present invention relates to a call blocking of a wireless telephone, and more particularly, to a device and a method for preventing a signal sound generated when a call is blocked in a portable device from being transmitted to a counterpart.

In general, a mobile device and a fixed device constituting a wireless phone transmit / receive control signals to each other to perform incoming / outgoing calls. In the case of a wireless phone adopting an analog method, the mobile phone and the fixed device use MSK modulation to control the call. Transmit over the channel.

In addition, when the call is terminated and the call is terminated by the portable device of the wireless telephone by the end key or other means, the end control signal is transmitted from the portable device to the fixed device, and the fixed device receives a termination signal after receiving the end control signal. Hook-on to release the CO line.

At this time, the termination control signal is transmitted through the telephone line when the fixed device detects the termination control signal applied from the portable device and hooks on at the end of the call.

Therefore, if the other party is not hooked on until the termination control signal is transmitted through the telephone line, the termination control signal sent to the telephone line is transmitted to the other party's telephone through the exchange, and the other side of the telephone There was a problem in that the audible beep generated by the termination control signal was heard.

Accordingly, an object of the present invention to solve the above problems is to provide an apparatus for preventing the blocking sound is sent to the other side when the call is terminated from the radio telephone side.

It is another object of the present invention to provide a method for preventing a cutoff sound from being sent to a counterpart when a call is terminated at the wireless telephone.

In order to achieve the above object of the present invention, when the call termination request is detected from the keypad, the control unit outputs a blocking signal to the MSK modem to block the call path for a predetermined time, and when the predetermined time elapses, In addition, the control signal outputting the termination message to the MSK modem to re-establish the communication path and to implement the termination sound cutoff device and method in the end of the call in the wireless telephone to send the termination message.

1 is a block diagram of an analog wireless telephone portable apparatus according to an embodiment of the present invention.

Figure 2 is a block diagram of an analog cordless telephone fixing device according to an embodiment of the present invention.

3 is a detailed block diagram of the MSK modem shown in FIGS.

4 is a control flowchart for cutting off a disconnect sound at the end of a call in a wireless telephone according to an embodiment of the present invention.

5 is a control flowchart for cutting off a disconnect sound at the end of a call in a wireless telephone according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Block configuration of the analog wireless telephone portable device according to an embodiment of the present invention is the control unit 100, the handset 110, MSK modem 120, wireless transmitter and receiver 130, signal generation The unit 140 and the keypad 150 are configured.

The controller 100 controls various configurations of the wireless telephone portable apparatus by a control program to control an overall operation for performing a service provided by the wireless telephone portable apparatus.

The handset 110 converts a voice signal applied from a handset MIC into an electrical signal, converts the electrical signal into a voice signal, and transmits the converted voice signal to a speaker.

The MSK modem 120 modulates an audio signal and a control message (digital data) into an MSK analog for easy transmission to a fixed device through a wireless channel, and receives the control signal modulated by the MSK from the fixed device by the controller 100. It is demodulated so that it can be converted into digital data. The MSK modem 120 has the detailed configuration shown in FIG.

The wireless transmitter / receiver 130 transmits the MSK signal and the voice signal provided from the MSK modem 120 to the wireless channel through an antenna or receives the MSK signal and the voice signal received through the antenna through the antenna to the MSK modem. Provided at 120.

The signal generator 140 generates a signal having a specific frequency under the control of the controller 100 and applies the signal to the radio transceiver 130. In the present invention, the signal generation unit 140 is generated under the control of the control unit 100, a call end notification signal for notifying when the call is terminated by the end key or other methods.

Keypad 150 is composed of a variety of keys so that the user can control the wireless telephone portable device, and generates the key data according to the key input to provide to the controller 100.

The block configuration of the analog wireless telephone fixture 260 according to an embodiment of the present invention is a control unit 200, a wireless transceiver 210, MSK modem 220, telephone network connection 230 as shown in FIG. The signal detector 240 and the call switch 250 are configured.

According to an embodiment of the present invention, the block configuration of the analog radiotelephone fixing apparatus for performing communication with the MSK signal through the radiotelephone channel formed with the above-described radiotelephone portable apparatus is shown in FIG.

The analog cordless telephone fixing device 260 is a wireless transmitter and receiver 210, MSK modem 220, control unit 200, signal detection unit 240, telephone network connection 230, hook switch (shown in Figure 2) 250).

The controller 200 controls the overall operation of the radiotelephone fixing device having the above configuration by a control program to perform a service provided by the fixing device.

The hook switch 250 connects or blocks a telephone line through which the exchanger 270 is operated under the control of the controller 200.

Since the rest of the configuration is the same as the function of the configuration described above with reference to FIG. 1, detailed description thereof will be omitted.

The detailed configuration of the MSK modems 120 and 220 illustrated in FIGS. 1 and 2 includes a voice processor 221, a modem 222, a voice amplifier and a filter 223, and various switches (as shown in FIG. 3). 224,225).

Referring to the configuration shown in FIG. 3, the voice processing unit 221 includes a compressor and an expander configured to limit bandwidth between wireless channels and remove noise in an analog manner. ), It has emphasis and demphasis for noise cancellation above 1KHz.

The various switches 224 and 225 include a switch that is switched under the control of the controller 100 or 200 for the mute function so that the MSK signal is not transmitted to both sides.

The modem 222 converts control data to be transmitted under the control of the control unit 100 or 200 to analog, converts the received analog MSK signal into digital control data, and provides the same to the control unit 100 or 200. The voice amplifier and filter unit 223 amplifies the transmitted / received voice or filters a signal of a desired band. In fact, the MSK modem having the above-described configuration may be referred to as an audio processor rather than an MSK modem, but the MSK modem is referred to as an MSK modem because the gist of the present invention is a signal control method.

A control flowchart according to a control process for blocking a cutoff sound at the end of a call in a wireless telephone according to an embodiment of the present invention is performed in the wireless telephone fixing apparatus through the control flowcharts shown in FIGS. 4 and 5.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to FIG. Radiotelephones are largely originated from the terminal and incoming from the telephone station, and the call formation on both sides is similar. In the following description, the procedure from the origination to the end of the call is described.

When a call request occurs due to a call key in a key of the keypad 150 of the wireless telephone portable apparatus, the controller 100 recognizes this and drives the wireless transmitter / receiver 130 to search for an empty channel. When the empty channel is formed, the controller 100 transmits a hook-off message including a caller identification number (ID) to the fixing device 260 through the MSK modem 120 and the wireless transmitter / receiver 130. The fixing device 260 searches whether the signal of the portable device is received at a predetermined period in the standby state. The fixing device 260 analyzes a command when an ID of a registered portable device is detected and hooks off by controlling the hook switch 250 shown in FIG. By the hook-off of the fixing device 26, the portable device receives a dial tone provided from the switchboard 270, and when the user presses a phone number calling the counterpart terminal 280 through the keypad 150, The DP is sent to the exchange 270 if the DTMF is mechanical in the electronic case through the formed pass. As a result, the mobile device communicates with the counterpart terminal 280 through the exchange 270.

If you want to end the call formed by the above process, there is no problem when the first end of the call in the opposite terminal 280, but the user of the mobile device first ends the call, that is, press the end key or call using other methods When the termination request is made, the controller 100 recognizes the termination of the call and transmits the hook-on message to the fixing device 260 through the MSK modem 120. The transmitted modem signal is transmitted to the MSK modem 220 of the fixing device 260 because the call path of the fixing device 260 is not yet blocked, but is also provided to the opposite terminal 280 as it is. Modem signals typically produce audible noises because the frequency changes irregularly with digital data. The control unit 200 of the fixing device 260 monitors whether the data is always received even in a call state, and when the data is received, immediately cuts off the hook switch 250 to minimize the sound, but listens to the turbulent sound for the time required to recognize the data. do.

In order to overcome the above problem, the controller 100 of the portable apparatus monitors whether there is key data for requesting the termination of the call from the keypad 150 in step 410 of FIG. 4. If the call termination request is detected in step 410, the control unit 100 proceeds to step 412 to block the call path by outputting a blocking signal for controlling the switches 224 and 225 provided in the MSK modem 120. As a result, the modem signal generated by the MSK modem 120 is not transmitted to the fixing device 260. On the other hand, if it is determined in step 412 that the predetermined time (about 1 to 2 seconds) has elapsed, the controller 100 proceeds to 414 d system. Blocking and maintaining the switches 224 and 225 for a predetermined time is to induce a counterpart terminal to terminate the call by providing a silent state to the terminal 280. In step 414, the control unit 100 outputs a formation signal for controlling the switches 224 and 225 to reconstruct the communication path, and then outputs a control signal to send a call termination message from the MSK modem 120. . The outgoing call termination message is applied to the MSK modem 220 and the exchange 270 of the fixing device 260 as described above, but the other end terminal 280 is in a state where the call is terminated. You don't have to hear anything unpleasant. However, if the other party is holding the handset late even in silence, you will still hear the sound, but if the silence lasts for less than two seconds, the call is terminated, so you do not hear the annoying sound. The controller 100 sends a call termination message and then proceeds to step 416 to completely terminate the call and switch to the standby state.

Hereinafter, another embodiment according to the present invention will be described in detail with reference to the above-described configuration.

The controller 100 of the portable device detects a call termination request in step 510, and proceeds to step 512 when the call termination request is detected. When the controller 100 proceeds to step 512, the controller 100 clears the display of the portable device, blocks the switches 224 and 225 provided in the MSK modem 120, and controls the signal generator 140 to control the signal generator 140. Generate a busy tone for a second. The busy tone generated by the signal generator 140 is provided to the fixed device 260 through the wireless transmitter / receiver 130 and applied to the counterpart terminal 280 through the exchange 270. The counterpart user hears an applied tone during the call and ends the call. The controller 100 of the portable apparatus determines whether a predetermined time has elapsed in step 514 while the tone during the call is transmitted.

If it is determined in step 514 that the predetermined time has elapsed, the control unit 100 proceeds to step 516 to control the switches 224 and 225 to reconstruct the loop and to send a call termination message from the MSK modem 120. do.

The controller 100 sends a call termination message and then proceeds to step 518 to completely terminate the call and to switch to the standby state.

In another embodiment according to the present invention, when the MSK modem 120 transmits data from the MSK modem 120 to the fixing device 260, a preamble for receiving synchronization of data is inserted into the receiver by about 16 bits. Other methods for reducing errors, such as portable device-specific IDs, data types, control commands, and CRCs, are also used. At this time, the above-mentioned data are transmitted through the MSK modem 120. When "1" is continuously transmitted as the transmitted data, it becomes a single frequency tone that is not disturbed by listening. Therefore, if only the end message generated by the portable device is kept as "11111 ..." such as the preamble, the fixed device 260 may turn off only the switch 225 shown in FIG. 3 when the long preamble is detected. Can listen to a single frequency tone. At this time, the portable device and the fixed device only transmit the "1" set as the end message to be sent, and the operation for ending the call is performed in the same manner as in the related art.

According to another embodiment of the present invention, when transmitting a tone according to the above-described FIG. 5, the signal detecting unit 240 is added to the fixing device 260 so that only the end message transmitted at the end of a call is not audible, such as a tone. Can be used as

As described above, the present invention can prevent users from inadvertently making mistakes on the other side by using the other end user so as not to hear a terrible end sound by maintaining a silent state or generating a constant tone at the end of a call, and satisfying a user's desire. It has the effect of improving the credibility of the product.

Claims (6)

In a portable device of a cordless telephone, A keypad with keys for call termination request, A control unit for outputting a blocking signal for a predetermined time when a call termination request is detected from the keypad and outputting a control signal for outputting a termination message together with a formation signal when the predetermined time elapses; Cut off at the end of a call in a wireless telephone, characterized in that it comprises a modem that is switched by the blocking signal and the formation signal to block or form a call path and generates and outputs a termination message by the control signal. In a portable device of a cordless telephone, A keypad with keys for call termination request, A control unit for outputting a tone generation control signal together with a cutoff signal for a predetermined time when a call termination request is detected from the keypad and outputting a formation signal when the predetermined time elapses; A modem having a switch switched by the blocking signal and the forming signal to block or form a call path; Cut-off sound cutoff device at the end of a call in a wireless telephone, characterized in that consisting of a signal generator for generating a tone during a call by the tone generation control signal. In the portable device of the wireless telephone, a method of blocking a cut off at the end of a call, When the call termination request is detected, the call path is cut off for a predetermined time, and when the predetermined time elapses, the disconnection sound cutoff at the end of the call in the wireless telephone, characterized in that to form a call to send the end message. In the portable device of the wireless telephone, a method of blocking a cut off at the end of a call, When a call termination request is detected, the telephone line is cut off for a predetermined time period, and then a tone is generated and transmitted during a call, and when the predetermined time elapses, the call path is cut off when the call ends. How to block. 5. The method of claim 4, wherein when the call path is re-formed, a message for requesting termination of the call is sent to a fixed device. In the portable device of the wireless telephone, a method of blocking a cut off at the end of a call, When the call termination request is detected, cutoff sound at the end of a call in a wireless telephone, characterized in that for transmitting the same data as the preamble which generates a single frequency tone in the end message as end data.

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