KR100322049B1 - Built-in earphone device of mobile terminal with time division multiple access method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earphone device of a time division multiple access (TDMA) portable terminal, and more particularly, to a built-in earphone device which is not affected by TDMA noise generated in a call and provides improved sound quality.

In the earphone device of the TDMA mobile terminal, the present invention has a positive / negative (-) terminal in each of a speaker and a microphone, and a vocoder for processing a voice signal input and output through the terminal, and a double contact method. It consists of 4 poles 6 terminals of the earphone microphone positive (+) terminal and the vocoder microphone positive (+) terminal through the first pole, the earphone microphone negative (-) terminal and the vocoder microphone through the second pole Earphone jacks for connecting negative (-) terminals and cutting the second and third poles, and respective voltages applied through the first pole and the cut third pole according to earphone switching and earphone insertion. As a result of comparing the predetermined reference voltage level is proposed a built-in earphone device having a voltage comparator for determining the state of the earphone switching and the earphone plug inlet transfer to the controller.

Description

Built-in earphone device of mobile terminal with time division multiple access method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earphone device of a time division multiple access (TDMA) portable terminal, and more particularly, to a built-in earphone device which is capable of providing more improved sound quality without being affected by TDMA noise generated in performing a call.

In performing a call using an earphone in a mobile terminal employing a time division multiple access method (TDMA), the external earphone device is generally used instead of an internal earphone device applied to a code division multiple access method. This is due to the inherent characteristics of the time-division multiple access method, namely, the degradation of sound quality due to the effect of TDMA noise due to instantaneous power consumption (0.6W for CDMA, but 2W for TDMA). This method is adopted as a result of the lack of space inside the portable terminal. As a result, even if a conventional code division multiple access (CDMA) portable terminal uses a built-in earphone device, the problem of deterioration of sound quality due to TDMA noise does not occur. I had to have a problem that I couldn't implement. On the other hand, for the above reason, it has become common to use an external earphone device in a TDMA mobile terminal. In this case, since the user must have a separate earphone device, the portability of the mobile terminal has to be significantly reduced. The cost of manufacturing the device separately has to be increased. In addition, in the case of an external earphone implemented in a TDMA mobile terminal, connection is generally made through the I / F connector of the mobile terminal, which prevents the use of the I / F connector for other purposes in performing a call through the earphone. He also gave birth. 1 is a view illustrating a state of use of a TDMA portable terminal using the external earphone. Referring to this, it shows that the mobile terminal 50, the I / F connector plug 40, the microphone 30, the switch 20, the speaker 10 is used.

For reference, the Finnish corporation 'NOKIA' has manufactured a time-division multiple access type mobile terminal that implements the built-in earphone device in order to solve the problem of the external earphone device in its own way. A single ended (Single Ended) method applied to a CDMA mobile terminal without influence of TDMA noise is applied. However, the single-contact internal earphone device has an easy effect in detecting the switching of the earphone, but does not solve the problem of deterioration of sound quality due to the TDMA noise effect mentioned above. Rather, the adoption of a single contact method has the adverse effect that only the volume of the call is reduced. An internal configuration diagram of the earphone device by the single contact method is shown in FIG. 2. 2 is a three-pole five-terminal earphone jack 130, the earphone plug is retracted, and the vocoder (Vocoder) 100 for processing the voice signal input and output from the speaker and the microphone of the earphone and the terminal, generating a reference voltage A voltage comparator for outputting the earphone plug into the mobile terminal controller using the voltage difference generated when the earphone plug is inserted into the reference voltage generator 110 and the earphone jack 130 and the reference voltage generated from the reference voltage generator. 120 shows that the conventional earphone device is configured.

As a result, it is very difficult to implement the earphone device that can remove the influence of the TDMA noise in the TDMA portable terminal and to be incorporated into the main body of the portable terminal due to the above-described reasons.

Accordingly, an object of the present invention is to provide an earphone device which can be built into the main body in a time division multiple access type portable terminal and at the same time minimizes the effects of TDMA noise generation.

In addition, an object of the present invention is to provide a device that can facilitate earphone switching detection and earphone inlet detection in the earphone device.

It is also an object of the present invention to provide an earphone device employing a double contact method that can solve the problem of a single contact method in a time-division multiple access method portable terminal.

In the present invention to achieve the above object, in the earphone device of the TDMA mobile terminal, each of the speaker and the microphone has a positive (+) / negative (-) terminal for processing the audio signal input and output through the terminal It consists of a vocoder and a 4-pole 6-terminal with a double contact type, and when the earphone is inserted, the earphone microphone positive (+) terminal, the vocoder microphone positive (+) terminal, and the second pole through the first pole. ) A jack which connects a terminal to the vocoder microphone negative terminal and cuts the second and third poles, and is applied through the first pole and the cut third pole according to earphone switching and earphone insertion. A built-in earphone device having a voltage comparator for determining the state of earphone switching and earphone plug in and transmitting the result to a control unit as a result of comparing each voltage generated with a predetermined reference voltage level. It features.

1 is a view showing a state of use of an external earphone device applied to a conventional TDMA portable terminal.

2 is an internal configuration of a built-in earphone device applying a single contact method in the conventional TDMA portable terminal.

3 is a view showing a state of use of the built-in earphone device applied to the TDMA portable terminal to the present invention.

4 is an internal configuration diagram in the case of detecting earphone switching in the built-in earphone device of the TDMA mobile terminal according to the present invention.

5 is an internal configuration diagram in the case of detecting a state of earphone insertion in the built-in earphone device of the TDMA mobile terminal according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of 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.

3 is a view showing a state of use of the built-in earphone device applied to the TDMA mobile terminal in the present invention.

Referring to Figure 3, it shows the state of use of the built-in earphone device implemented by the embodiment of the present invention described below, which is the earphone plug that is inserted into the TDMA mobile terminal 300 and the earphone jack provided according to the present invention ( 340, and a speaker 310, a microphone 330, and an earphone switch 320. The above-mentioned configuration is distinguished from the external earphone device in the conventional TDMA method mentioned above, and does not use the I / F connector of the portable terminal, and exhibits the same use state as the internal earphone device applied in the CDMA method. Is the point. Therefore, in the present invention, it is not necessary to provide a chip for processing a separate voice signal path in the earphone. In the related art, the chip for processing the voice path has been embedded in the I / F connector plug 40 connected to the I / F connector, which is a major reason for the increase in portability and manufacturing cost.

4 is a diagram showing the internal configuration of a built-in earphone device of a TDMA mobile terminal according to the present invention, particularly when detecting earphone switching.

Referring to this, the vocoder 400 is a device for compressing or processing a voice signal input and output, and is usually implemented as one chip, and the implemented chip includes a speaker and a microphone positive / negative terminal. Provision is made. Such a terminal usually uses a predetermined terminal among the I / O terminals. Earphone jack 430 is implemented as a four-pole six-terminal, the first pole (A) is a microphone positive (+) terminal of the vocoder 400, the second pole (B) is a microphone sound of the vocoder 400 ( The third pole (C) is a mobile terminal microphone negative (-) terminal, the fourth pole (D) is a mobile terminal speaker negative (-) terminal, and the fifth pole (E) is a speaker of the vocoder 400. The negative terminal and the sixth pole F are connected to the speaker positive terminal of the vocoder 400. The first electrode A is applied to the negative terminal of the voltage comparator 420. The voltage comparator 420 compares the difference of the applied voltage and outputs the result to the controller having the result. The control unit is implemented as a microprocessor as a central processing unit provided in a conventional portable terminal to control the overall operation. The reference voltage generator 410 outputs a predetermined level voltage to the voltage comparator 420. The earphone is always inserted into the earphone jack 430, and has an earphone speaker and an earphone microphone therein. And when used in connection with the mobile terminal is provided with an earphone switch 440 for controlling the call and call termination and other functions performed. In addition, the earphone switch 44 is connected in parallel to each of the earphone microphone lines divided into positive (+) / negative (−) and implemented as a contact switch. Although the line is not shown, this is also implemented by dividing the positive (+) / negative (-). Meanwhile, the speaker, the microphone terminal, and the earphone line are divided into positive (+) / negative (-) and are implemented due to the implementation of the earphone device according to the adoption of the double contacted (Double Ended) method. In contrast, the above-described built-in earphone device (FIGS. 1 and 2) employs a single contact method. For reference, the adoption of the double contact method in the present invention is to minimize the influence of the earphone device embedded in the main body of the mobile terminal by the TDMA noise generated in the TDMA mobile terminal. In other words, even if instantaneous power consumption is caused by TDMA noise, the TDMA noise is not affected by the mutual noise cancellation of the positive and negative noises of the speaker and the microphone, respectively. Therefore, the improved sound quality is compensated for the call through the earphone device. In addition, since the principle of the double contact is generally known technology, detailed description thereof will be omitted.

The operation of detecting earphone switching in the built-in earphone device of the TDMA mobile terminal shown in FIG. 4 will be described below.

First, the earphone plug is inserted into the earphone jack 430. Then, a constant bias voltage is generated at the microphone positive / negative terminal of the vocoder 400. As an example, a voltage of 2.2 V may be applied to the microphone negative terminal and 0.3 V of the microphone positive terminal. This is a value of the voltage generated in the manufacture of ordinary products and this value does not limit the scope of the present invention. In addition, the specific values mentioned below also become actual values generated during manufacture and experiment. A predetermined constant reference voltage is output from the output terminal of the reference voltage generator 410 and applied to the positive terminal of the voltage comparator 420. As an example, a reference voltage of about 1V to 1.5V is generally generated and applied. In this state, when the earphone switch 440 of the earphone is in an open state, it is applied to the negative terminal of the voltage comparator 420 via its own impedance of the earphone microphone line (for example, 2.2 KΩ). The voltage at this time is 0.3V. In this case, the voltage comparator 420 compares the reference voltage level applied to the positive terminal with the voltage applied to the negative terminal and transmits the result to the controller. At this time, the contents transmitted are contents according to the switching operation of the earphone switch 440 not performed. However, when the earphone switch 440 is operated and contacted, the bias between the earphone microphone line is changed, and at this time, the voltage level is higher than the open state of the earphone switch 440 to the negative terminal of the voltage comparator 420. This increased voltage, for example a voltage of about 2.2V is applied. This applied voltage is compared with the reference voltage level applied to the positive terminal, the result of which is output as a result opposite to the previous switch open state. If the voltage comparison result according to the opening of the earphone switch 440 is designated as 'high' and the voltage comparison result according to the operation is designated as 'low', then the 'low' result is output and transmitted to the controller. The controller achieves operation control according to earphone switching operation according to 'high' and 'low'. As described above, the operation control may include functions such as call execution, call termination, voice recognition start, and the like, or other predetermined functions may be started or terminated. As a result, the switch operation of the earphone switch 440 can be detected according to the voltage comparison result of the voltage comparator 420, and the operation of the normal earphone function is performed in the built-in earphone device according to the embodiment of the present invention. On the other hand, the above operation is performed in the state that the earphone plug is inserted into the earphone jack 430. In addition, since the operation of the configuration of FIG. 4 does not detect the earphone switch operation when the earphone plug is not retracted, unnecessary power consumption can be reduced.

Fig. 5 is a diagram showing the internal configuration of a case of detecting an earphone insertion state in the built-in earphone device of the TDMA mobile terminal according to the present invention.

Also in the case of FIG. 5, the internal configuration of the earphone device is the same as the internal configuration of FIG. Each of the vocoder 500, the reference voltage generator 510, the voltage comparator 520, and the earphone jack 530 has the same configuration and group, but only in the configuration shown in FIG. The pole (C) is connected to the negative (-) terminal of the voltage comparator 520, and at the same time connected to the microphone negative (-) terminal of the terminal. The first pole A is connected to the terminal microphone positive terminal. Such a connection may be configured at the same time as the configuration of the earphone device illustrated in FIG. 4 as a configuration of detecting the earphone plug when it is inserted. That is, the configuration of FIG. 4 and the configuration of FIG. 5 are implemented in the same earphone device.

Referring to the detection operation of the earphone retracted state according to the present invention through the configuration shown in FIG. 5, first, a voltage of a predetermined level is applied from the reference voltage generator 510 to the voltage comparator 520. When the earphone plug is not inserted into the earphone jack 530, the third pole C and the second pole B are connected to each other so that the microphone plug from the microphone negative terminal of the vocoder 500 is connected. A bias is applied to the negative terminal of the voltage comparator 520. In this case, since the voltage level applied to the negative terminal of the voltage comparator 520 is greater than the voltage level of the positive terminal, which is a reference voltage, the output of the voltage comparator 520 becomes 'low'. This is delivered to the control unit is to perform the operation of the earphone is not made. That is, the input / output negative signal path of the vocoder 500 is set to the main body speaker of the portable terminal. If the earphone jack 530 is inserted into the earphone plug, the fifth and sixth poles of the earphone jack 530 are cut from each other, and the terminals of the third pole are floated to 0V. Then, a voltage of 0V level is applied to the negative terminal of the voltage comparator 520, and the voltage comparator 520 compares the applied 0V with the reference voltage level and outputs the result. The output at this time is 'high'. In this case, the controller determines that the earphone plug is made and processes the corresponding operation.

As a result, the earphone device proposed in the present invention can be incorporated into a TDMA portable terminal through the configuration as shown in FIG. 3, and at the same time, the earphone plug is recognized through the configuration shown in FIGS. 4 and 5. And it is possible to detect whether the operation of the earphone switch is implemented a normal earphone device.

Meanwhile, in the detailed description of the present invention, specific examples and specific numerical values are defined, but various modifications, extensions, and applications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above has the advantage that can be implemented in the built-in earphone device applicable to the portable terminal of the TDMA method that did not implement the built-in earphone device due to the generation of TDMA noise. In addition, in the implementation of the built-in earphone device there is an advantage that it is possible to implement a device that can detect the state of the earphone inlet state and whether the operation of the earphone switch.

In the Korean input of the Korean alphabet of a key input device having a limited number of keys, the input of the Korean alphabet can be unified, and thus there is an advantage of making the user more convenient. In other words, it becomes easy to use the character input and the character input at a higher speed is possible. In addition, the four-pole six-terminal earphone jack without the implementation of a separate terminal there is an advantage that can achieve the detection of the earphone switching, and earphone entry state.

Claims (1)

In the earphone device of a time-division multiple connection type portable terminal, A vocoder having positive (+) / negative (-) terminals in each of the speaker and the microphone and processing voice signals input and output through the terminals; It is composed of 4 poles and 6 terminals of double contact type, and earphone earphones positive (+) line, the vocoder microphone positive (+) terminal, the second pole through the first pole and the earphone microphone An earphone jack connecting the vocoder microphone negative (-) terminal and cutting the second and third poles; As a result of comparing each voltage applied through the first pole and the cut third pole according to earphone switching and earphone insertion with a predetermined reference voltage level, the earphone switching and earphone plug insertion state are determined and transmitted to the controller. Built-in earphone device of a time-division multiple access method portable terminal, characterized in that consisting of a voltage comparator.