KR101061820B1 - Mobile communication terminal that can be used as a portable speaker system - Google Patents

Abstract

The present invention relates to a mobile communication terminal that can be used as a portable speaker system using an external portable speaker system by connecting an external device to the mobile communication terminal. The present invention includes a key input unit for receiving a user's hands-free or external speaker selection command; A MIDI chip for converting and processing various acoustic contents; A first analog switch for connecting or disconnecting a signal output from the MIDI chip to a headphone amplifier under control of a controller; A headphone amplifier for amplifying the signal input from the midi chip to a predetermined level and outputting the headphone connector; A second analog switch for connecting a signal output from the headphone amplifier to a headphone connector or a signal input from an external device to an audio amplifier under control of a controller; An audio amplifier for amplifying the input analog signal and outputting the same to the speaker; According to a user's selection command input from the key input unit, the operation states of the first and second analog switches are controlled to output sound signals output from the MIDI chip via the headphone amplifier and the headphone connector, or from an external device. And a control unit for outputting the sound signal through the audio amplifier to the speaker.

Mobile communications, external devices, external, portable, speakers, handsfree, audio content

Description

Mobile Station Used as Portable Speaker System {Mobile Station Used Potable Speaker System}

1 is a block diagram showing a mobile communication terminal having a conventional speaker system.

Figure 2 is a block diagram of a mobile communication terminal that can be utilized as a portable speaker system according to an embodiment of the present invention.

Figure 3 is a use state diagram showing an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: key input unit 110: control unit

120: display unit 130: midi chip

140: first analog switch 150: headphone amplifier

160: headphone connector 170, 180: audio amplifier

190, 200: Speaker 210: Second analog switch

The present invention relates to a mobile communication terminal, and more particularly, to a mobile communication terminal that can be utilized as a portable speaker system used as an external portable speaker system by connecting an external device to a mobile communication terminal.

Recently, mobile communication terminals (including mobile phones and PDAs) have evolved to enhance multimedia functions, and camera functions have gradually reached levels comparable to digital cameras. Currently, mobile phones that have enhanced video functions with camera functions and high-definition LCDs are leading the market, but recently, interest in sound is gradually increasing, and mobile phones with enhanced sound functions are gradually being released.

Now, the speaker embedded in the mobile communication terminal has evolved into a function of playing various music contents and outputting sound effects, instead of simply ringing a ring.

1 is a block diagram showing a mobile communication terminal having a conventional speaker system.

As shown in the drawing, a mobile communication terminal having a conventional speaker system includes a key input unit 10, a mobile station modem (MSM) 11, a display unit 12, a midi chip 13, an analog switch 14, It consists of a headphone amplifier 15, headphone connector 16, audio amplifiers 17 and 18 and speakers 19 and 20.

In this way, the mobile communication terminal with enhanced sound function has a built-in MIDI chip 13 for reproducing music close to the original sound, and an audio amplifier 17 and 18 for amplifying a sound source. It shows a significant level of performance.

In addition, unlike in the past, only one speaker is used, and two speakers 19 and 20 are mounted to implement a stereo function. In other words, users can access contents companies through wireless Internet, download contents such as music, music videos, videos, etc. that they want, play them on their mobile phones, and enjoy ringtones and sound effects in games. You can listen to music.

At this time, the sound source data of the various contents reproduces the original sound through the synthesizer (Synthesizer) built in the midi chip 13, and this is again output as an analog signal (Analog Signal) through the D / A converter. Since the analog signal thus produced has a low output level, the analog signal is amplified and output to the speakers 19 and 20 through the audio amplifiers 17 and 18.

However, such a conventional mobile communication terminal has been able to achieve audio level performance by implementing stereo functions by mounting two speakers in recent years, but only music stored in a mobile phone can use music stored in a mobile phone. There was a problem of low utilization.

Accordingly, the present invention has been made to solve the above-mentioned problems, and provides a mobile communication terminal that can be utilized as a portable speaker system using an external portable speaker system by connecting an external device to the mobile communication terminal. Its purpose is to.

A mobile communication terminal that can be used as a portable speaker system according to the present invention for achieving the above object includes a key input unit for receiving a user's hands-free or external speaker selection command; A MIDI chip for generating and converting an acoustic signal; A first analog switch for connecting or disconnecting a signal output from the MIDI chip to a headphone amplifier under control of a controller; A headphone amplifier for amplifying the signal input from the midi chip to a predetermined level and outputting the headphone connector; A second analog switch for connecting a signal output from the headphone amplifier to a headphone connector or a signal input from an external device to an audio amplifier under control of a controller; An audio amplifier for amplifying the input analog signal and outputting the same to the speaker; In addition to controlling the general operation of the mobile communication terminal, and controlling the operation state of the first and second analog switches according to the user's selection command input from the key input unit to output the sound signal output from the MIDI chip to the headphone amplifier And a controller for outputting through a headphone connector or outputting a sound signal input from an external device to a speaker through an audio amplifier.

When the user selects a hands-free command, the controller turns on the first analog switch and connects the second analog switch to the headphone amplifier. In addition, when the user selects an external speaker command, the first analog switch is turned off, and the second analog switch is connected to the audio amplifier.

The audio amplifier and the speaker are composed of at least two or more in order to implement a stereo or higher sound.

The second analog switch is composed of two input terminals each from the headphone amplifier side and the headphone connector side, one output terminal to the audio amplifier side, and one control terminal from the controller.

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

Figure 2 is a block diagram of a mobile communication terminal that can be utilized as a portable speaker system according to an embodiment of the present invention, Figure 3 is a state diagram showing an embodiment of the present invention.

As shown in the present invention, the key input unit 100, the control unit 110, the display unit 120, the MIDI chip 130, the first analog switch 140, the headphone amplifier 150, the headphone connector 160, The audio amplifier 170, 180, the speaker 190, and the second analog switch 210 are configured.

The key input unit 110 includes a numeric key, a voice mailbox switching key, and various function keys, and generates a corresponding key input signal when the user presses a predetermined key and outputs the corresponding key input signal to the controller 110.

The controller 110 controls the general operation of the mobile communication terminal, and in particular, controls the operation state of the first and second analog switches 140 and 210. That is, when using in the normal hands-free function, the first analog switch 140 is turned on and the second analog switch 210 is connected to the headphone amplifier 150 to thereby connect the sound signal output from the MIDI chip 130. Through the headphone amplifier 150 and the headphone connector 160 to output to the normal headphone.

On the other hand, when using as an external speaker system, by turning off the first analog switch 140 and connecting the second analog switch 210 to the audio amplifier 170, 180 side, through the headphone connector 160 The audio signal input from the device to the mobile communication terminal is output through the audio amplifiers 170, 180 and the speakers 190, 200.

At this time, the use of the external speaker system is adjusted according to the control signal of the controller 110. When the user selects the "external speaker system" menu on the menu screen of the mobile communication terminal, the signal is input to the key input unit 100. The control signal 110 is transmitted from the control unit 110, and a control signal is generated from the control unit 110 to adjust the first and second analog switches 140 and 210.

The display unit 120 is controlled by the control unit 110 and displays an operation state together with the key input signal generated by the key input unit 100 and various information signals from the control unit 110.

The MIDI chip 130 converts various acoustic contents stored in the mobile communication terminal memory into a signal suitable for output to the speakers 190 and 200. Built-in synthesizer function and AD converter, it converts digital signal input from memory into various sound sources and outputs it as analog signal.

The first analog switch 140 connects or blocks the signal output from the MIDI chip 130 to the headphone amplifier 150 under the control of the controller 110.

The headphone amplifier 150 amplifies the signal input from the midi chip 130 to a predetermined level and outputs the signal to the headphone connector 160.

The headphone connector 160 is a terminal for connecting handsfree, headphones, earphones, etc., and generally includes two output signal lines and one microphone input terminal. The two output terminals are output terminals for a headphone having a stereo function, but may be utilized as stereo input terminals in the present invention.

The audio amplifiers 170 and 180 amplify the input analog signals. Since the level of the signal input from the MIDI chip 130 or the external device 300, 310, 320 is low, it is amplified to a level suitable for output to the speakers 190, 200. At this time, the amplification ratio is adjusted by the user pressing the button of the key input unit 100 (volume adjustment).

The speakers 190 and 200 output analog signals amplified from the audio amplifiers 170 and 180.

The second analog switch 210 refers to a switch that controls the analog signal. It has two input terminals, one output terminal and one control terminal. The signal input to the control terminal determines which of the two input terminals is connected to the output terminal.

Referring to the operation of the present invention configured in this way in more detail as follows.

As shown in the drawing, the present invention receives a signal from an external device through a headphone connector 160 of a mobile communication terminal having an audio level speaker system and outputs the signal to the speakers 190 and 200 of the mobile communication terminal. That is, the mobile communication terminal is equipped with a headphone connector 160 used for hands-free, etc. In the present invention, the jack is used as a line-in terminal to connect with an external device.

As an external device, as illustrated in FIG. 3, a CDP or MDP 300, an MP3 player 310, a walkman 320, and the like, and most of these portable external devices do not have a built-in speaker. External speakers are required to output music stored in these portable devices to speakers rather than headphones.

At this time, when the mobile communication terminal of the present invention is used as an external speaker system, portable devices capable of playing music can be connected to the mobile communication terminal to listen to music.

As shown in FIG. 2, the second analog switch 210 is provided in the headphone connector 160 so that the sound signal output from the MIDI chip 130 is used when the headphone connector 150 is used as a normal hands-free function. Output through the 160 to the normal headphone. On the other hand, when used as an external speaker system outputs a sound signal input to the mobile communication terminal from the external device through the headphone connector 160 through the audio amplifier 170, 180 and the speaker 190, 200.

At this time, the second analog switch 210 is adjusted according to the control signal of the controller 110. That is, when the user selects the "external speaker system" menu on the menu screen of the mobile communication terminal, the signal is transmitted from the key input unit 100 to the control unit 110, and the control unit 110 generates a control signal to generate the first signal. The analog switch 210 is adjusted.

In general, two audio amplifiers 170 and 180 are used in a mobile communication terminal having a stereo function. That is, one audio amplifier 170 and 180 are used for the left and right speakers 190 and 200.

When the headphone connector 160 is connected to each of the audio amplifiers 170 and 180 through the second analog switch 210, the CDP or MDP 300, the MP3 player 310, the walkman 320, or the like may be used. The signal input from the external device is amplified by the audio amplifiers 170 and 180 and output to the speakers 190 and 200. At this time, the audio amplifier 170, 180 is operated by the control signal of the controller 110 when the user selects the "external speaker system" menu as described above.

Accordingly, as shown in FIG. 3, portable devices such as a CDP or MDP 300, an MP3 player 310, and a walkman 320 generally have a conventional cable 302 and a jack 301. By connecting easily to the mobile communication terminal of the present invention through the external speaker 190, 200 can obtain the effect of listening to music.

This is efficient in terms of utilizing the excellent audio system of the mobile communication terminal, and can be said to have a great advantage in that multiple people can easily listen to music together.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the general knowledge in the field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Anyone with a variety of variations will be possible.

As described above, according to the mobile communication terminal that can be used as a portable speaker system according to the present invention, portable devices, such as a CDP or MDP, an MP3 player, or a walkman, that generally do not have a built-in speaker, are connected to the mobile communication terminal of the present invention. You can get the effect of listening to music through the external speaker of the terminal itself. This is effective in terms of utilizing the excellent audio system of the mobile communication terminal, and has the effect that it has a big advantage in that it is easy to listen to music with multiple people.

Claims (5)

A key input unit configured to receive a user's hands-free or external speaker selection command; A MIDI chip for generating and converting an acoustic signal; A first analog switch for connecting or disconnecting a signal output from the MIDI chip to a headphone amplifier under control of a controller; A headphone amplifier for amplifying the signal input from the midi chip to a predetermined level and outputting the headphone connector; A second analog switch for connecting a signal output from the headphone amplifier to a headphone connector or a signal input from an external device to an audio amplifier under control of a controller; An audio amplifier for amplifying the input analog signal and outputting the same to the speaker; In addition to controlling the general operation of the mobile communication terminal, and controlling the operation state of the first and second analog switches according to the user's selection command input from the key input unit to output the sound signal output from the MIDI chip to the headphone amplifier And a controller for outputting through a headphone connector or outputting a sound signal input from an external device to a speaker through an audio amplifier. The method of claim 1, The controller may be configured to turn on the first analog switch and connect the second analog switch to the headphone amplifier when the user selects a hands-free command. The method of claim 1, The controller may be configured to turn off the first analog switch and connect the second analog switch to the audio amplifier when the user selects an external speaker command. The method of claim 1, The audio amplifier and the speaker, the mobile communication terminal that can be utilized as a portable speaker system, characterized in that composed of at least two or more in order to implement a sound more than stereo. The method of claim 1, The second analog switch, An input terminal for receiving a signal from the headphone amplifier side; An input terminal for receiving a signal from the headphone connector side; An output terminal for outputting a signal to the audio amplifier side; And Control terminal for receiving a control signal from the controller Mobile communication terminal that can be utilized as a portable speaker system comprising a.

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