KR100689459B1 - Mobile communication terminal for having fm transmitter transmitting audio signal for external audio apparatus and it's method - Google Patents

Abstract

A mobile terminal having an FM transmitter for transmitting an audio signal to an external sound device and its method are provided to wirelessly transmit an audio signal to an external sound device such as a car audio having FM tuner, a home audio, and FM radio and to provide a specified A/V system overcoming the limitation of a small speaker of a mobile terminal. An audio source unit(101) decodes an audio signal according to each source and outputs a digital audio signal. An audio processing unit(102) converts the outputted digital audio signal into an analog audio signal, and switches the analog audio signal according to a selected audio signal output unit. An FM transmitter(103) receives a selected frequency for modulating the analog audio signal into an FM frequency, and modulates the analog audio signal with the selected frequency. A transmitter/receiver(104) wirelessly transmits the FM-modulated audio signal. A controller(105) controls the audio source unit(101) to select the audio source, controls an output format of the analog audio signal inputted to the audio processing unit(104), and also controls selecting of the frequency for modulating the analog audio signal.

Description

MOBILE COMMUNICATION TERMINAL FOR HAVING FM TRANSMITTER TRANSMITTING AUDIO SIGNAL FOR EXTERNAL AUDIO APPARATUS AND IT'S METHOD}

1 is a block diagram showing the configuration of a mobile communication terminal with a built-in FM transmitter according to the present invention.

FIG. 2 is a block diagram showing a configuration including a switch between an audio processor and an FM transmitter of a mobile communication terminal in which the FM transmitter of FIG. 1 is incorporated. FIG.

3 is a flowchart illustrating a process of transmitting an audio signal to an external sound device in a mobile communication terminal having an FM transmitter according to the present invention;

4 is an exemplary diagram illustrating an audio signal transmission result of an audio source menu and a selected audio source according to the present invention.

FIG. 5 is a diagram illustrating a system for wirelessly modulating an audio signal from a mobile communication terminal to an external sound device and wirelessly transmitting the same; FIG.

The present invention relates to a mobile communication terminal, and more particularly, to a mobile communication terminal and a method for transmitting an audio signal to an external sound device using an FM transmitter.

In general, a mobile communication terminal is a terminal capable of transmitting and receiving audio signals or data wirelessly in a high frequency range of approximately 800 MHz to 1.9 GHz and includes a speaker for listening to a voice of the other party and a microphone for transmitting voice information of a user. For convenience, the earphone plug is provided with an earphone jack to listen to the other party's voice and transmit the user's voice through the earphone with a microphone.

In addition, recently, due to the development of mobile communication technology, it is possible to download music files and enjoy music through the mobile communication terminal.

For example, a mobile communication terminal equipped with an MP3 function has been released so that you can enjoy not only calls but also MP3 music through a mobile phone that is always carried with you.

In addition, as the wireless Internet is enabled, it provides a navigation service, which is drive information, to its own driver using the wireless Internet. In this case, the navigation service provided through the mobile communication terminal is provided through the speaker and the display window of the mobile communication terminal.

However, functions related to audio playback such as MP3 and navigation using a mobile communication terminal have limitations that can only be heard through small speakers or earphones provided by the mobile communication terminal. These limitations related to audio playback can cause ear fatigue and weaken hearing in long-term listening with earphones, and in the case of small speakers, demands for louder volume and effective viewing of multimedia content videos. There is a problem that it is difficult to meet the needs of consumers.

The present invention, in the functions related to audio playback, such as call content, MP3, and video using a mobile communication terminal, such as car audio, home audio, home theater and FM radio with a FM (Frequency Modulation) tuner When the audio signal is wirelessly transmitted to the sound device, it can be output from the speaker of the external sound device that has been received, thereby providing the user with a specialized A / V system for audio reproduction that overcomes the limitations of the small speaker of the mobile communication terminal. The purpose is to provide a built-in mobile communication terminal and a method thereof.

In order to achieve the above object, the present invention provides a mobile communication terminal having a built-in frequency modulation (FM) transmitter for outputting an audio signal to an external sound device, each audio signal for each source to a decoder according to each source An audio source unit for decoding and outputting the digital audio signal; An audio processor for converting the digital audio signal into an analog audio signal and switching the analog audio signal according to the selected audio signal output means; An FM transmitter unit for receiving a frequency for modulating the analog audio signal into a frequency and modulating the audio signal with the selected frequency; A transmitter / receiver for wirelessly transmitting an audio signal modulated to the FM frequency from the FM transmitter; And a controller for controlling an audio source selection in the audio source unit, controlling an output format of the analog audio signal input to the audio processing unit, and controlling a frequency selection for modulating the analog audio signal.

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

1 is a block diagram showing the configuration of a mobile communication terminal with a built-in FM transmitter according to the present invention.

As shown in FIG. 1, a mobile communication terminal having an FM transmitter includes an audio source unit 101 and a controller 105 for outputting a digital audio signal decoded for each source audio signal to the controller 105. The audio processor 102 converts the digital audio signal input through the analog audio signal and switches the output means of the analog audio signal under the control of the controller 105 and receives the analog audio signal from the audio processor 102. FM transmitter 103 for modulating to FM frequency under control of 105, FM transmitter / receiver 104 for receiving FM modulated audio signal from FM transmitter 103 and transmitting it to external sound device, and audio source Control the selection of the audio source with respect to the unit 101, and control the output format of the audio signal input from the audio processor 102; It comprises a control unit 105 for controlling each component of the mobile communication terminal according to the present invention, including the FM transmitter unit 103.

Looking at the configuration of the mobile communication terminal embedded with such an FM transmitter in more detail, first, the audio source unit 101 is composed of a respective decoder for decoding the audio signal for each source of the mobile communication terminal. Here, the audio signal for each source of the mobile communication terminal includes all audio data output to the speaker of the mobile communication terminal such as voice call data, multimedia content data, and MP3 data.

In an embodiment of the present invention, the audio source unit 101 may include a CDMA processor module 108 for decoding a call, a video playing module 109 for decoding video data, and an MP3 player module 110 for decoding MP3 data. It is configured to include).

When the source selection signal is input from the controller 105, the audio source unit 101 decodes data of the selected source into a corresponding module and outputs the digital audio signal of the decoded data to the controller 105. If the source selection signal for the multimedia content data is input from the controller 105, the video signal is decoded by the video reproducing module and the decoded digital audio signal is output to the controller 105.

The audio processor 102 converts the digital audio signal input from the controller 105 into an analog audio signal, and converts the analog audio signal into a speaker or an FM transmitter unit of the mobile communication terminal according to the switching signal from the controller 105. 103).

Here, the switching signal input from the control unit 105 to the audio processing unit 102 is a signal for determining the output means for the analog audio signal, in the embodiment of the present invention, the FM transmission and the built-in speaker through the FM transmitter unit 103 Determine general delivery through This will be described in detail later with reference to FIG. 2.

The FM transmitter 103 performs FM modulation on the analog audio signal input from the audio processor 102 and transmits the analog audio signal to the transceiver 104. The FM transmitter 103 may include a modulator 111 for selecting a frequency to be FM modulated under the control of the controller 105 and a modulator for FM modulating the analog audio signal at a frequency selected by the tuner 111 ( 112).

Tuning unit 111 is generally composed of a tuner used for short-range wireless transmission, preferably a digital tuner for digital tuning.

The modulator 112 is configured as a modulator for modulating and amplifying the analog audio signal input from the audio processor 102 into a specific frequency channel, and modulates the analog audio signal at a frequency selected by the tuning unit 111. Amplify.

When the analog audio signal is input from the audio processor 102 to the modulator 112 of the FM transmitter 103 and the frequency is selected by the input signal of the controller 105 from the tuner 111, the modulator 112 is selected. ) FM-modulates the input analog audio signal to the frequency selected by the tuning unit 111. The FM modulated analog audio signal is transmitted to the transceiver 104.

Transceiver 104 is a part that is connected to the mobile communication network to receive a call from the outside or attempts to connect the call, and transmits various data to the base station through the antenna under the control of the controller 105, and receives the data received from the base station Transfer to control unit 105. The transceiver 104 wirelessly transmits an FM modulated analog audio signal input from the FM transmitter 103 to an external sound device.

When the FM transmitter 103 transmits an FM modulated analog audio signal to an external sound device, a separate internal antenna may be provided in the FM transmitter 103 to transmit the external sound device.

The controller 105 controls the audio signal and the control signal of the mobile communication terminal so that the audio signal can be transmitted from the mobile communication terminal to the external sound device. First, the control unit 105 controls the source selection of the audio signal from the audio source unit 101 by key input of the input / output unit 106, receives the digital audio signal of the source selected from the audio source unit 101, and outputs the audio. Transfer to the processing unit 102.

The control unit 105 controls the output format of the audio signal in the audio processing unit 102 by key input of the input / output unit 106. The output format of the audio signal is configured to output the audio signal to the speaker of the mobile communication terminal, or transmit it to the FM transmitter unit 103 for wireless transmission to an external sound device.

In addition, the controller 105 controls the selection of a frequency for modulating the audio signal transmitted to the FM transmitter unit 103. At this time, the control unit 105 controls the tuning unit 111 in the FM transmitter unit 103 to select a frequency for modulating an audio signal according to a key input of the input / output unit 106. In this case, a frequency for modulating the audio signal may be selected as a frequency without public broadcasting among frequencies between 88.1 and 108 MHz.

The frequency selected by the tuning unit 111 according to the control of the control unit 105 is a frequency for modulating the audio signal input from the audio processing unit 102 to the modulation unit 112.

In addition, the input / output unit 106 includes a keypad 113 for outputting key input data corresponding to a key input pressed by the user to the controller 105 and a display unit 114 for providing visual information to the user. It is configured to include.

FIG. 2 is a block diagram illustrating a configuration in which a switch is provided between an audio processor and an FM transmitter of a mobile communication terminal in which the FM transmitter of FIG. 1 is incorporated.

As shown in FIG. 2, the audio processor 102 may include a D / A converter 201 and a D / A converter 201 for converting a digital audio signal input from the controller 105 into an analog audio signal. The converted analog audio signal is controlled by the control unit 105, and is configured as a switch 202 for switching and transmitting to the built-in speaker or the FM transmitter unit 103 of the mobile communication terminal.

Here, the control signal input to the switch 202 is a signal for selecting the output means for outputting the analog audio signal, the control unit 105 receives it by the key input of the input and output unit 106.

3 is a flowchart illustrating a process of transmitting an audio signal to an external sound device in a mobile communication terminal having an FM transmitter according to the present invention.

Referring to FIG. 3, when an input of an audio source selection key is detected by the controller 105, an audio source menu is displayed on the display unit 114. The user selects an audio source to be selected from the audio source menu displayed on the display unit 114 by inputting a selection key included in the keypad 113 in a predetermined manner (301). In an embodiment of the present invention, the audio source selected in the audio source menu includes call details, video, and MP3.

The audio source data selected in the audio source menu is decoded by the corresponding module in the audio source unit 101 and outputs the digital audio signal of the decoded data to the controller 105. The controller 105 receiving the digital audio signal from the audio source unit 101 transmits the input digital audio signal to the audio processor 102.

The controller 105 displays the selection screen for the audio signal output means to the user, and receives the selection for the audio signal output means therefrom. The controller 105 controls the audio signal output means to be transmitted to the audio processor 102 to determine the direction of outputting the selection information of the audio processor 102. At this time, the audio processor 102 simultaneously performs a function of converting the input digital audio signal into an analog audio signal.

If the audio signal output means is selected as the external sound device (303), the controller 105 transfers the analog audio signal of the audio processor 102 to the FM transmitter 103 and controls the FM frequency setting to be modulated. 304. In operation 305, the analog audio signal is FM-modulated using the FM frequency set by the controller 105. In this case, the FM frequency may use a preset value, and may be set through the controller 105 by providing the frequency setting screen.

The FM modulated analog audio signal is transmitted to the transceiver 104 and wirelessly transmitted to the external sound device through the transceiver 104 (306).

The external acoustic device that receives the FM modulated analog audio signal from the FM transmitter unit 103 of the mobile communication terminal outputs the audio signal through the speaker. Here, the external sound device for outputting an audio signal includes a car audio with an FM tuner, a home audio, a home theater, and a general FM radio.

If the audio signal output means is not selected as the external sound device, the controller 105 controls the audio processor 102 to transmit the analog audio signal to the speaker of the mobile communication terminal, so that the transmitted analog audio signal is transmitted to the mobile communication terminal. The control is output to the speaker (307).

Through the above process, the audio signal of the mobile communication terminal is transmitted to the external sound device equipped with the FM tuner, so that users can enjoy more realistic sound using A / V such as home audio and home theater, not the speaker of the mobile communication terminal. Will be.

4 is an exemplary screen diagram illustrating an audio source menu according to the present invention.

Referring to FIG. 4, an audio source menu for transmitting an audio signal to an external sound device in a mobile communication terminal having an FM transmitter according to an embodiment of the present invention includes a call content, a video, and an MP3. The user may select an audio source to be listened to through the speaker of the external sound device using the audio source menu shown in FIG. 4.

The method of setting the audio source menu includes a method of selecting an audio source on the keypad 113 of an audio source menu displayed on the display unit 114 of the mobile communication terminal. It consists of typing and selecting.

FIG. 5 is a diagram illustrating an embodiment of a system for FM-modulating an audio signal from a mobile communication terminal to an external sound device and wirelessly transmitting the same.

As illustrated in FIG. 5, the FM modulated audio signal is wirelessly transmitted from the mobile communication terminal 501 to an external sound device such as the car audio 502 and the home audio 503.

If the frequency is selected to 90.0 MHz by the tuning unit 111 by the control unit 105, the modulator 112 modulates the analog audio signal input from the audio processing unit 102 to a frequency of 90.0 MHz. If the user adjusts the frequencies of the external acoustic devices such as the car audio 602 and the home audio 603 to a frequency of 90.0 MHz, which is the same as the frequency selected by the tuning unit 111, the audio signal modulated to the 90.0 MHz frequency is a mobile communication. It is wirelessly transmitted to the external sound devices 502 and 503 through the transceiver 104 of the terminal 501.

The external acoustic devices 502 and 503 that have received the FM modulated audio signal output the audio signal through the provided speaker.

When the reproduction of the audio signal is stopped in the mobile communication terminal 501, the transmission of the FM modulated audio signal to the external sound devices 502 and 503 is stopped, and thus the audio signal is output from the external sound devices 502 and 503. Also stopped.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited by the drawings.

The present invention as described above, in the functions related to audio playback, such as call content, MP3 and video using a mobile communication terminal, an external sound device such as a car audio, home audio, home theater and a general FM radio with an FM tuner When the audio signal is transmitted over the air, the external audio device receiving the audio signal outputs the audio, thereby providing a user with a specialized A / V system for audio reproduction that overcomes the limitation of the small speaker of the mobile communication terminal.

Claims (11)

A mobile communication terminal incorporating a frequency modulation (FM) transmitter for outputting an audio signal to an external sound device, An audio source unit for decoding an audio signal according to each source and outputting the audio signal as a digital audio signal; An audio processor converting the output digital audio signal into an analog audio signal and switching the analog audio signal according to a selected audio signal output means; An FM transmitter unit receiving a frequency for modulating the analog audio signal to an FM frequency and modulating the analog audio signal at the selected frequency; A transceiver for wirelessly transmitting the FM modulated audio signal; And A control unit controlling an audio source selection of the audio source unit, controlling an output format of the analog audio signal input to the audio processing unit, and controlling a frequency selection to modulate the analog audio signal, And the control unit is capable of changing the audio source selection of the audio source unit while radio transmission of the FM modulated audio signal is in progress. The method of claim 1, The audio source is Includes all audio data output to the speaker of the mobile communication terminal, The audio source unit, And a CDMA processor module for signal processing of a call, a video reproducing module for decoding video data, and an MP3 player module for decoding MP3 data. The method of claim 1, wherein the audio processor A D / A converter converting the digital audio signal into an analog audio signal; And a switch for transmitting the analog audio signal by switching to any one device of the speaker and the FM transmitter of the mobile communication terminal. And the switch operates according to a control signal of the control unit. The method of claim 1, wherein the FM transmitter unit A tuning unit receiving a frequency for modulating the analog audio signal from the control unit and generating a signal having the transmitted frequency; And a modulation unit configured to FM modulate an analog audio signal using the generated frequency signal. The method of claim 1, wherein the FM transmitter unit And a separate built-in antenna for transmitting the FM modulated analog audio signal. In a method of transmitting an audio signal to an external sound device in a mobile communication terminal having a built-in frequency modulation (FM) transmitter, A first step of converting a digital audio signal generated by decoding data of an audio source according to each source into an analog audio signal; A second step of selecting output means for outputting the converted analog audio signal; Determining the frequency for modulating the analog audio signal when the selected audio signal output means is an external sound device; A fourth step of FM modulating the analog audio signal at the determined frequency; A fifth step of wirelessly transmitting the FM modulated analog audio signal to the external sound device, And transmitting the audio signal to an external sound device, wherein the selection of the audio source can be changed while radio transmission of the FM modulated audio signal is in progress. The method of claim 6, wherein the audio source, Includes all audio data output to the speaker of the mobile communication terminal, Method for transmitting an audio signal to the external sound device, characterized in that any one of the call content data, video data, and MP3 data. The method of claim 6, wherein the third step, And if the selected audio signal output means is a speaker of the mobile communication terminal, the audio signal further comprises a sixth step output to the speaker. The method of claim 6, wherein the fourth step, And a frequency for FM modulation of the analog audio signal is determined as a frequency without an official broadcast among frequencies between 88.1 and 108 MHz. The method of claim 1, wherein the control unit, And, when a call occurs during wireless transmission of the audio signal, changing the audio selection of the audio source unit to a call content for the call. The method of claim 6, And when the call occurs during the wireless transmission of the audio signal, changing the selection of the audio source to the content of the call for the call.

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