KR100664950B1 - Apparatus for receiving digital multimedia broadcasting and method for outputting audio by using the same - Google Patents

Abstract

A DMB receiving apparatus and an audio output method using the same are provided to enable an audio output module including at least one of a speaker or a woofer to output an audio signal received from a main device, thereby enabling a user to listen DMB in stereo even when the user uses the main device, in which a speaker is not built or only a speaker for mono output is built. A DMB(Digital Multimedia Broadcasting) receiving apparatus(100) comprises the followings: a receiving module(110) which receives a DMB signal; a main processing module(120) which demodulates the received DMB signal; an interface module(130) which transmits the demodulated DMB signal to a main device and receives a certain audio signal from the main device; and an audio output module(140) which outputs the received audio signal, wherein the audio output module(140) includes at least one of a speaker or a woofer.

Description

Apparatus for receiving digital multimedia broadcasting and method for outputting audio by using the same}

1 is a view showing an application example of the DMB receiving apparatus according to an embodiment of the present invention.

2 is a block diagram showing a DMB receiving apparatus according to an embodiment of the present invention.

3 is a diagram illustrating the audio output module of FIG. 2 in more detail.

4 is a block diagram illustrating a main device according to an embodiment of the present invention.

5 is a flowchart illustrating an audio signal processing method according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

110: receiving module 120: main processing module

130: interface module 140: audio output module

142: SPDIF decoding module 144, 146: speaker

148: woofer

The present invention relates to digital multimedia broadcasting, and more particularly, to a digital multimedia broadcasting receiver with a built-in speaker and an audio output method using the same.

With the development of digital broadcasting technology and mobile communication technology, research on infrastructure and technology related to digital multimedia broadcasting (DMB) has been actively conducted in recent years. DMB refers to a broadcasting service that enables a user to watch various multimedia broadcasts through a multi-channel through a mobile device such as a personal portable receiver or a vehicle receiver, even when moving.

Therefore, the user can basically watch the DMB through the mobile device for receiving the DMB. However, even if a mobile device (eg, a general mobile phone, PDA, laptop, etc.) that does not support the DMB reception function, a technology for enabling a user to watch DMB broadcasting by installing a separate DMB receiver is being developed.

However, in the related art, the DMB receiving apparatus merely plays a role of simply receiving a DMB signal, performing a predetermined signal processing task, and delivering the same to a mobile device. At this time, the mobile device decodes the video and audio signals included in the DMB signal and outputs them to the user through their display module and speakers.

In such a case, if a speaker is not built in the mobile device, a problem arises in that a user should use only earphones for listening to DMB broadcasting. Or, if the mobile device has only a built-in speaker for mono output, a problem arises in that the user cannot listen to the DMB broadcast in stereo.

An object of the present invention is to provide a DMB receiving device with a built-in speaker.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a digital multimedia broadcasting receiving apparatus according to an embodiment of the present invention includes a receiving module for receiving a digital multimedia broadcasting signal, a main processing module for demodulating the received digital multimedia broadcasting signal, and the demodulated digital multimedia broadcasting. An interface module for transmitting a signal to the main device, receiving a predetermined audio signal from the main device, and an audio output module for outputting the received audio signal.

In order to achieve the above object, the audio output method according to an embodiment of the present invention, demodulating the received digital multimedia broadcasting signal, transmitting the demodulated digital multimedia broadcasting signal to the main device, the digital from the main device Receiving an audio signal included in a multimedia broadcasting signal, and outputting the received audio signal.

Specific details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

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

1 is a view showing an application example of the DMB receiving apparatus according to an embodiment of the present invention.

The DMB receiving apparatus 100 may perform a series of signal processing operations by receiving a DMB signal, and may include a speaker and may be connected to or disconnected from the main apparatus 200. Here, the term "connection" means a state in which the DMB receiving apparatus 100 and the main apparatus 200 can communicate with each other through a wired medium, that is, an electrical connection. However, this is merely an example, and the meaning of “connected” should also be interpreted to mean that the DMB receiving apparatus 100 and the main apparatus 200 are in a state in which they can communicate with each other through a wireless medium in a non-contact state.

The main device 200 is a device capable of connecting to the DMB receiving apparatus 100 and outputting a video signal or an audio signal included in the DMB signal transmitted from the DMB receiving apparatus 100 to the user. In the present embodiment, the main device 200 is illustrated as a mobile phone, but the present invention is not limited thereto, and the main device 200 may be a mobile device such as a PDA or a notebook computer.

When the main device 200 is connected to the DMB receiving device 100, the DMB receiving device 100 receives the DMB signal and transmits it to the main device 200. The DMB signal received by the DMB receiving apparatus 100 may be output from the satellite 10 or the terrestrial base station 20.

The main device 200 extracts a video signal and an audio signal from the DMB signal received from the DMB receiving device 100 and decodes them. The decoded video signal may be displayed to the user through a display module included in the main device 200, and the audio signal is transmitted to the DMB receiving device 100.

The DMB receiving apparatus 100 outputs the audio signal received from the main apparatus 200 through the speaker built therein.

2 is a block diagram showing a DMB receiving apparatus according to an embodiment of the present invention.

The illustrated DMB receiving apparatus 100 includes a receiving module 110, a main processing module 120, an interface module 130, and an audio output module 140.

The receiving module 110 receives a DMB signal. The DMB signal may include at least one of video data, audio data, and additional information data divided into transport packets of a predetermined unit. The video data and the audio data may be compressed by using a video compression method such as MPEG4 and an audio compression method such as MP3, and the additional data may include subtitle data or other broadcast information related to video data or audio data. have.

The receiving module 110 may perform a predetermined signal processing operation on the received DMB signal. For example, the DMB signal may be a kind of radio frequency (RF) signal. The receiving module 110 may reduce the RF signal to an low frequency (IF) signal and extract a baseband signal from the IF signal and transmit the extracted baseband signal to the main processing module 120. However, the present invention is not limited thereto, and the reception module 110 may perform a direct conversion between the RF signal and the baseband signal by using a direct conversion method (also called a zero IF method).

In addition, the receiving module 110 may receive a predetermined control signal from the main processing module 120 and perform channel tuning.

The main processing module 120 demodulates the DMB signal received by the receiving module 110. For example, the main processing module 120 may perform filtering, waveform shaping, or the like on the baseband signal received from the receiving module 110. In more detail, the main processing module 120 performs analog / digital conversion on the signal received from the receiver 110, performs quadrature phase shift keying (QPSK), and performs a forward error correction (FEC) method. Error correction processing can be performed.

In addition, when the control signal for channel tuning is received from the main device 200 through the interface module 130, the main processing module 120 may transmit it to the receiving module 110.

The interface module 130 is connected to the main device 200 and transmits the DMB signal demodulated by the main processing module 120 to the main device 200. In addition, the interface module 130 may receive a control signal or a predetermined audio signal for channel tuning from the main device 200. Therefore, the interface module 130 may include a plurality of signal transmission terminals, and DMB signal transmission, control signal reception, and audio signal reception may be performed according to the signal transmission terminal.

The audio output module 140 outputs an audio signal received from the main device 200 to the user. For this purpose, the audio output module 140 may include a speaker. Preferably, the audio output module 140 may include two or more speakers for stereo broadcasting. In addition, the audio output module 140 may further include a woofer.

Meanwhile, when the main device 200 transmits an audio signal through a Sony / Philips Digital Interface (SPDIF) signal, the audio output module 140 may further include a SPDIF decoding module. The audio output module 140 according to this embodiment is illustrated in more detail in FIG. 3.

As shown in FIG. 3, the audio output module 140 includes a speaker 144, 146, a woofer 148, and an SPDIF decoding module 142. The SPDIF decoding module 142 decodes the SPDIF signal transmitted from the main device 200 through the interface module 130 to generate a left / right audio signal and a bass audio signal, and respectively, the speaker 144 and 146 and the woofer. Forward to 148. The speakers 144 and 146 and the woofer 148 may output an audio signal received from the SPDIF decoding module 142 to the user.

Although the audio output module 140 is illustrated as including two speakers 144 and 146 in the present embodiment, the present invention is not limited thereto and the audio output module 140 may include one or more speakers. have.

4 is a block diagram illustrating a main device according to an embodiment of the present invention.

The illustrated main device 200 includes an interface module 210, a demultiplexing module 220, a decoding module 230, a control module 240, and an SPDIF encoding module 250.

The interface module 210 is connected to the DMB receiving apparatus 100 and receives a demodulated DMB signal from the DMB receiving apparatus 100. In addition, the interface module 210 may transmit a control signal or a predetermined audio signal for channel tuning to the DMB receiving apparatus 100. Accordingly, the interface module 210 may include a plurality of signal transmission terminals, and DMB signal reception, control signal transmission, audio signal transmission, and the like may be performed according to the signal transmission terminal.

The demultiplexing module 220 parses the DMB signal received by the interface module 210 from the DMB receiving apparatus 100 to separate the video signal, the audio signal, and the additional information signal, and to decode them to the decoding module 230. to provide.

The decoding module 230 includes a video decoder 232 and an audio decoder 234, which decode the video signal and the audio signal provided from the demultiplexing module 220, respectively. The video decoder 232 may be implemented according to a video decompression method such as moving picture experts group-2 (MPEG-2), moving picture experts group-2 (MPEG-4), and the audio decoder 234 It may be implemented according to an audio decompression scheme such as MP3 (MPEG Layer-3) and AC3 (Audio Compression 3). The decoded video signal is displayed through the display module 260, and the decoded audio signal is transferred to the SPDIF encoding module 250 under the control of the control module 240. However, the decoded audio signal may be output through the speaker 270 or transmitted to the earphone jack 280 according to the user's setting.

In addition, the decoding module 230 includes a data decoder 236, which decodes the additional information signal provided from the demultiplexing module 220. The additional information may include broadcast information such as caption data, channel number, channel name, broadcast date, broadcast start time, and the like, and may be displayed through the display module 260.

The control module 240 generates control information for channel tuning according to a user's request and transfers it to the interface module 210. In addition, the control module 240 allows the audio module decoded by the decoding module 230 to be delivered to the SPDIF encoding module 250 when the interface module 210 is connected to the DMB receiving apparatus 100. However, the control module 240 may control the audio signal to be transmitted to the speaker 270 or the earphone connection jack 280 according to the user's setting.

The SPDIF encoding module 250 encodes the audio signal received from the decoding module 230 in the SPDIF format to generate an SPDIF signal and transmits the SPDIF signal to the interface module 210.

In the description of FIG. 2 to FIG. 2, 'module' refers to a hardware component such as software or a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the module plays certain roles. However, modules are not meant to be limited to software or hardware. The module may be configured to be in an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, a module may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, subroutines. , Segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided by the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

5 is a flowchart illustrating an audio signal processing method according to an embodiment of the present invention.

First, when the receiving module 110 of the DMB receiving apparatus 100 receives the DMB signal (S110), the main processing module 120 demodulates it (S115). In this case, the receiving module 110 may reduce the DMB signal in the form of an RF signal to an IF (Immediate Frequency) signal of low frequency, extract a baseband signal from the IF signal, and transfer the baseband signal to the main processing module 120. . In addition, the main processing module 120 performs analog / digital conversion on the signal transmitted from the receiver 110, performs quadrature phase shift keying (QPSK), and performs error correction processing using a forward error correction (FEC) method. You can do it.

The DMB signal demodulated by the main processing module 120 is transmitted to the main device 200 through the interface module 130 (S120).

When the interface module 210 of the main device 200 receives the DMB signal from the DMB receiving device 100, the demultiplexing module 220 demultiplexes the DMB signal to separate the video signal, the audio signal, and the additional information signal. (S125).

Thereafter, the decoding module 230 decodes the video signal, the audio signal, and the additional information signal (S130). In this case, the decoded video signal and the additional information signal may be displayed to the user through the display module 260.

Meanwhile, the decoded audio signal is encoded by the SPDIF encoding module 250 (S135) and transmitted to the DMB receiving apparatus 100 through the interface module 210 (S140). However, depending on the user's setting, the audio signal may be transmitted to the speaker 270 or the earphone connecting jack 280 of the main device 200.

When the interface module 130 of the DMB receiving device 100 receives the SPDIF signal from the main device 200, the SPDIF decoding module 142 decodes it (S145). For example, the SPDIF decoding module 142 may generate a left / right audio signal and a bass audio signal by decoding the SPDIF signal.

Thereafter, the speakers 144 and 146 and the woofer 148 output audio signals to the user (S150).

Meanwhile, according to another embodiment of the present invention, the main device 200 may not include the SPDIF encoding module 250, and the main device 200 directly receives the DMB of the audio signal decoded by the decoding module 230. May be passed to device 100. In this case, steps S135 and S145 may be omitted in the flowchart of FIG. 5, and in step S140, the interface module 210 of the main device 200 delivers the decoded audio signal directly to the DMB receiving device 100. The speakers 144 and 146 and the woofer 148 of the DMB receiving apparatus 100 may directly output an audio signal transmitted from the main apparatus 200.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the digital multimedia broadcasting receiver and the audio output method using the same according to the present invention as described above, even if the main apparatus which does not have a built-in speaker or only a speaker for mono output is used, The effect is that you can listen to the stereo.

Claims (5)

A receiving module for receiving a digital multimedia broadcasting signal; A main processing module for demodulating the received digital multimedia broadcasting signal; An interface module for transmitting the demodulated digital multimedia broadcasting signal to a main device and receiving a predetermined audio signal from the main device; And And an audio output module for outputting the received audio signal. The method of claim 1, The audio output module includes at least one of a speaker and a woofer. The method of claim 2, The received audio signal is an SPDIF signal, The audio output module further comprises a SPDIF decoding module for decoding the SPDIF signal. Demodulating the received digital multimedia broadcast signal; Delivering the demodulated digital multimedia broadcasting signal to a main device; Receiving an audio signal included in the digital multimedia broadcasting signal from the main device; And And outputting the received audio signal. The method of claim 4, wherein The audio signal received from the main device is an SPDIF signal, The outputting of the audio signal may include decoding a regular SPDIF signal; And And outputting the decoded SPDIF signal.

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