KR100725180B1 - Digital Multimedia BroadcastingDMB Receiver - Google Patents

Abstract

According to the present invention, an antenna unit for receiving a digital multimedia broadcasting signal; A tuner section for tuning the broadcast signal received from the antenna section; A baseband processor for demodulating the broadcast signal tuned by the tuner; An acoustic restorer for restoring the audio signal included in the demodulated broadcast signal into a digital sound signal; A codec for converting the digital sound signal restored by the sound restorer into an analog sound signal; An amplifier for amplifying the magnitude of the acoustic signal converted by the codec; A speaker for converting the amplified sound signal and outputting the sound; A text restorer for restoring a data signal included in the broadcast signal demodulated by the baseband processor to a text signal; A display unit for displaying the characters restored by the character restorer on a screen; A transmitter for interconnecting the baseband processor and the PC so that the broadcast signal demodulated by the baseband processor can be restored on the PC so that the user can receive the digital multimedia broadcasting service from the PC; A power controller capable of reducing power consumption by controlling power applied to the tuner unit, the baseband processor, the codec, the amplifier, and the display unit; And a microprocessor for controlling a tuner unit, a baseband processor, an acoustic restorer, a codec, an amplifier, a character restorer, a display unit, a transmitter, and a power controller. .

Description

Digital Multimedia Broadcasting Receiver {Digital Multimedia Broadcasting (DMB) Receiver}

1 is a block diagram of a conventional digital multimedia broadcasting receiver;

2 is a block diagram of a digital multimedia broadcasting receiver according to an embodiment of the present invention;

3 is a perspective view illustrating a state in which the digital multimedia broadcasting receiver shown in FIG. 2 is connected to a PC.

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

100 ... Digital Multimedia Broadcasting Receiver

110. Antenna section 120. Tuner section

130 ... baseband processor 140 ... sound restorer

141 ... Codec 142 ... Amplifier

143 ... Speaker 150 ... Character Restorer

151 Display unit 160 Transmitter

170 ... Power Controller 180 ... Microprocessor

190 ... Auxiliary memory device 200 ... Control key

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital multimedia broadcasting receiver, and more particularly, to digital multimedia broadcasting that can provide various multimedia broadcasting services such as high-quality audio, video, and text information in a fixed place as well as on the move using digital codes. It relates to a receiving device.

Digital multimedia broadcasting uses a portable terminal such as a mobile phone, a personal digital assistant (PDA), a laptop, and the like, and is a kind of personal service that allows a user to provide TV and audio broadcasting of various channels on the go. Furthermore, digital multimedia broadcasting is a service that can transmit various services such as disaster broadcasting, local information, traffic information, weather information, stock information, etc. into a terminal in the form of text, graphics, or video, and has been in the spotlight as the next generation broadcasting service.

In general, a digital multimedia broadcasting receiver includes an image processing unit, an audio processing unit, and a text processing unit capable of restoring video, audio, and text signals included in a digital multimedia broadcasting signal.

1 is a block diagram showing an example of such a conventional digital multimedia broadcasting receiver.

As shown, the conventional digital multimedia broadcasting receiver 10 includes an antenna 1 for receiving digital multimedia broadcasting, a tuner unit 2 for tuning the signal received from the antenna 1, and this tuner unit. A demultiplexer (3) for demodulating video signals, text signals, and audio signals among the signals selected from (2), and reconstructing video signals, text signals, and audio signals demodulated from the demultiplexer (3), respectively. And an image processing unit 4, a character processing unit 5, and an audio processing unit 6. The restored image and text signals are output to the display unit 7, and the audio signals are output through the speaker 8 as sound. The output is converted. That is, the conventional digital multimedia broadcasting receiver processes not only audio signals and text signals but also all broadcast signals including video signals among digital multimedia broadcast signals.

However, the conventional digital multimedia broadcasting receiver as described above should have a microprocessor with excellent performance, a large auxiliary storage device, and an expensive color display for processing image signals. Therefore, the power consumption of the digital multimedia broadcasting receiver is not only excessive, the production cost is excessive, but also the volume is large, there is a disadvantage that the user is inconvenient to carry.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a digital multimedia broadcasting receiver which reduces power consumption, is low in manufacturing cost, and is easy to carry.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

Digital multimedia broadcasting receiving apparatus of the present invention for achieving the above object, the antenna unit for receiving a digital multimedia broadcasting signal; A tuner unit for tuning the broadcast signal received from the antenna unit; A baseband processor for demodulating the broadcast signal tuned by the tuner; An acoustic restorer for restoring the audio signal included in the demodulated broadcast signal into a digital sound signal; A codec for converting the digital sound signal restored by the sound restorer into an analog sound signal; An amplifier for amplifying the magnitude of the acoustic signal converted by the codec; A speaker for converting the amplified sound signal and outputting the sound; A text restorer for restoring a data signal included in the broadcast signal demodulated by the baseband processor to a text signal; A display unit for displaying the characters restored by the character restorer on a screen; A transmitter for interconnecting the baseband processor and the PC so that the broadcast signal demodulated by the baseband processor can be restored on the PC so that the user can receive the digital multimedia broadcasting service from the PC; A power controller capable of reducing power consumption by controlling power applied to the tuner unit, the baseband processor, the codec, the amplifier, and the display unit; And a microprocessor for controlling the tuner unit, the baseband processor, the acoustic restorer, the codec, the amplifier, the character restorer, the display unit, the transmitter, and the power controller. do.

The digital multimedia broadcasting receiver may include: an auxiliary memory device capable of storing an audio file compressed by a moving picture expert group (MPEG); And an operation key for selecting digital multimedia broadcasting audio and playing a compressed audio file stored in the auxiliary memory device, and allowing a user to conveniently control selection, playback, stop, and volume control of the audio. It may include.

Furthermore, the sound restorer may restore audio files stored in the auxiliary memory device to digital sound signals, and may include MP3 (MPEG Audio Layer-3) format, WMA (Windows Media Audio) format, and OGG (Ogg Vorbis) format. And MPEG-4 Bit Sliced Arithmetic Coding (BSAC) format, it is preferable to restore an audio signal for an audio file compressed by one of the selected formats.

In addition, the microprocessor may control the auxiliary storage device and the operation key and determine a situation in which the transmitter is connected to the PC.

Furthermore, the display unit may display a file name, a compression scheme, a compression ratio, digital multimedia broadcasting reception information, and a reception state of the compressed audio file stored in the auxiliary memory device, respectively, and are controllable by the microprocessor. desirable.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle of definition.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 is a block diagram of a digital multimedia broadcasting receiver according to an embodiment of the present invention.

As shown, the digital multimedia broadcasting receiver 100 of the present invention includes an antenna unit 110, a tuner unit 120, a baseband processor 130, an acoustic restorer 140, a codec 141, an amplifier ( 142, a speaker 143, a character restorer 150, a display unit 151, a transmitter 160, a power controller 170, and a microprocessor 180.

The antenna unit 110 may receive a radio broadcast signal of an ultra high frequency (UHF) band or an L-band band. The received signal may be defined as a broadcast signal modulated by the Eureka-147 method.

The tuner unit 120 tunes the signal received by the antenna unit 110 to the baseband processor 130, and the baseband processor 130 transmits the broadcast signal modulated in the Eureka-147 format. 2 Demodulate in the MPEG-2 Transport Stream format. This demodulated MPEG-2 transport stream is typically buffered in the baseband processor 130, which can be delivered into the microprocessor 180 upon request of the microprocessor 180.

The baseband processor 130 may include an orthogonal frequency division modulation (OFDM) decoder, a differential quadrature phase shift keying (DQPSK) decoder, a Viterbi decoder, and a read solomon decoder. .

The microprocessor 180 may control the tuner unit 120 and the baseband processor 130, respectively, and may include a universal serial bus (USB), a general purpose input output (GPIO), an inter integrated communication (I2C), and an ADC ( Analog to Digital Converter) can be built in. In addition, the microprocessor 180 is a 32-bit system on chip with an external interrupt processing function, a pulse watt modulation (PWM) function, and a function to control the address bus and the data bus. Chip; SoC). In addition, the microprocessor 180 includes an MPG (PEG Audio Layer-3) decoder, a WMA (Windows Media Audio) decoder, and an OGG (Ogg Vorbis) decoder, and an external flash memory and a static memory. ) Can be managed and controlled.

The audio signal included in the MPEG-2 transport stream demodulated by the baseband processor 130 is restored to the digital sound signal by the sound restorer 140.

The reconstructed digital sound signal is converted into an analog sound signal by the codec 141, and then its amplitude is amplified by the amplifier 142, and finally output as sound to the outside through the speaker 143. By the above procedure, the digital multimedia broadcasting receiver 100 enables the user to listen to the broadcast.

In addition, the data signal included in the MPEG-2 transport stream demodulated by the baseband processor 130 is restored to the text signal by the character restorer 150, and the restored text is displayed on the display unit 151. It is displayed in graphical form.

The acoustic restorer 140, the codec 141, the amplifier 142, the character restorer 150, and the display unit 151 are all controllable by the microprocessor 180.

The text information that may be displayed on the display unit 151 may include all kinds of traffic information, weather information, stock information, disaster information, local information, and the like. In addition, the display unit 151 may display reception information and reception status of the digital multimedia broadcasting, respectively.

In addition, the display unit 151 may be implemented as a color display or a black and white display, and may be implemented as a monochrome display in order to reduce manufacturing costs.

The digital multimedia broadcasting receiver 100 of the present invention as described above recovers only the audio signal and the text signal from the received broadcast signal, and does not restore the video signal, and thus has excellent performance with a video signal processor for processing the video signal. There is no need to have a processor and an expensive color display. Therefore, the power consumption of the digital multimedia broadcasting receiver 100 can be reduced, its manufacturing cost can be reduced, and its volume can be downsized.

Meanwhile, the digital multimedia broadcasting receiver 100 of the present invention may further include an auxiliary memory device 190 and an operation key 200.

 In addition to being able to receive digital multimedia broadcasting, the digital multimedia broadcasting receiver 100 may also receive compressed audio files stored in the auxiliary memory device 190 when the user does not listen to the digital multimedia broadcasting. Can play. The audio file stored in the auxiliary memory device 190 may be defined as an audio file compressed by a moving picture expert group (MPEG) method.

The compressed audio file stored in the auxiliary memory device 190 may be restored to the digital sound signal by the sound restorer 140. The reconstructed digital sound signal is converted into an analog sound signal by the codec 141, and then its amplitude is amplified by the amplifier 142, and finally output as sound to the outside through the speaker 143.

The operation key 200 allows the user to conveniently select, play, stop, and adjust the volume of the audio file stored in the auxiliary memory device 190, and receive the digital multimedia broadcasting audio and the auxiliary memory device. Playback of the compressed audio file stored in 190 can be selected according to the user's convenience.

In addition, the acoustic restorer 140 is an MP3 (MPEG Audio Layer-3) format, WMA (Windows Media Audio) format, OGG (Ogg Vorbis) format and MPEG among the audio files stored in the auxiliary storage device 190 The audio signal for the audio file compressed by the selected one of audio files compressed in the bit sliced arithmetic coding (BSAC) format can be restored.

In addition, the display unit 151 may display a file name, a compression method, and a compression rate of the compressed audio file stored in the auxiliary memory device 190, respectively. The operation may be performed by the microprocessor 180. Controllable.

As described above, when the user does not listen to the digital multimedia broadcasting and reproduces the compressed audio file stored in the auxiliary memory device 190, the power controller 170 receives and processes the digital multimedia broadcasting. ) And the power of the baseband processor 130, it is possible to reduce the power consumption. That is, the power controller 170 may control such as supplying and cutting off power applied to the tuner unit 120 and the baseband processor 130.

In addition, the power controller 170, the auxiliary memory device 190, and the operation key 200 may be controlled by the microprocessor 180.

According to the digital multimedia broadcasting receiver 100 of the present invention as described above, when the digital multimedia broadcasting is not listened to, the user merely operates the operation key 200, so that the secondary storage apparatus 190 is stored. Play and listen to compressed audio files. In this case, the microprocessor 180 determines that the user is not listening to the digital multimedia broadcasting, and the power controller 170 automatically supplies power of the tuner unit 120 and the baseband processor 130. By blocking, power consumption of the digital multimedia broadcasting receiver 100 can be reduced.

Meanwhile, the digital multimedia broadcasting receiver 100 of the present invention may provide digital multimedia broadcasting as an external form to a PC.

The digital multimedia broadcasting receiver 100 of the present invention includes a baseband processor 130 and a transmitter 160 interconnecting the PC so that all broadcasting services including audio and text as well as video broadcasting can be provided from the PC. It is included.

The tuner 120 tunes the signal received by the antenna unit 110 and transmits the signal to the baseband processor 130. The baseband processor 130 transmits the broadcast signal modulated in the Eureka-147 format to MPEG-2. Demodulate in the MPEG-2 Transport Stream format. This demodulated MPEG-2 transport stream is typically buffered in baseband processor 130.

If the PC and the digital multimedia broadcasting receiver 100 are interconnected by the transmitter 160, the microprocessor 180 may convert the MPEG-2 transport stream demodulated by the baseband processor 130 into an acoustic restorer ( 140, and does not transmit to the character restorer 150, but directly to the PC via the transmitter 160.

The transmitter 160 may be implemented as a universal serial bus (USB), the microprocessor 180 may control the transmitter 160, and the transmitter 160 is connected to a PC. You can judge the situation.

The PC includes a processing unit capable of recovering audio, text and video signals included in a digital multimedia broadcasting signal, and a central processing unit (CPU) including the functions of the microprocessor 180. The image and text broadcasting restored by the processing unit are output to the monitor of the PC, and the restored sound is output through the speaker of the PC.

Accordingly, the digital multimedia broadcasting receiver 100 of the present invention may provide a digital multimedia broadcasting service including audio, text and video signals to the PC while the transmitter 160 is connected to the PC.

3 is a perspective view showing a state in which the digital multimedia broadcasting receiver 100 of the present invention is connected to a PC by the transmitter 160 as described above. The digital multimedia broadcasting receiver 100 shown in FIG. 3 briefly illustrates an external housing of the digital multimedia broadcasting receiver 100 shown in FIG. 2, and it should be understood that the housing may be modified in various forms. do.

When the digital multimedia broadcasting receiver 100 is external to the PC as described above, the audio, text, and video signals demodulated by the baseband processor 130 are processed inside the PC. The codec 141, the amplifier 142, and the display unit 151 included in FIG. 1 exist in a substantially inoperable state.

In addition, the power controller 170 may control to supply and cut off the power applied to the codec 141, the amplifier 142, and the display unit 151.

Therefore, when the digital multimedia broadcasting receiver 100 is physically connected to the PC through the transmitter 160, the microprocessor 180 determines that the digital multimedia broadcasting receiver 100 is connected to the PC, The controller 170 automatically cuts off power of the codec 141, the amplifier 142, and the display unit 151, thereby reducing power consumption of the digital multimedia broadcasting receiver 100.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is described by the person of ordinary skill in the art to which the present invention pertains. Various modifications and variations are possible without departing from the scope of the appended claims.

According to the digital multimedia broadcasting receiver of the present invention, by reconstructing only the audio signal and the text signal from the received broadcast signal, and not the video signal, the image signal processor for processing the video signal, a microprocessor having high performance and high cost There is no need to have a color display. Therefore, the power consumption of the digital multimedia broadcasting receiver can be reduced, its manufacturing cost can be reduced, and its volume can be downsized, thus being portable.

In addition, when connected to a PC, all digital multimedia broadcasting services including audio, text and video signals can be provided from the PC.

Furthermore, when the user does not listen to the digital multimedia broadcasting, the digital multimedia broadcasting receiving apparatus of the present invention can play an audio file compressed by the Moving Picture Experts Group (MPEG) method. This operation can be selected according to the user's request, and there is an advantage that it is easy to operate.

In addition, the power controller included in the digital multimedia broadcasting receiver of the present invention can supply and cut power to some elements included in the digital multimedia broadcasting receiver, thereby reducing the power consumption of the digital multimedia broadcasting receiver. to provide.

Claims (5)

An antenna unit for receiving a digital multimedia broadcasting signal; A tuner unit for tuning the broadcast signal received from the antenna unit; A baseband processor for demodulating the broadcast signal tuned by the tuner; An acoustic restorer for restoring the audio signal included in the demodulated broadcast signal into a digital sound signal; A codec for converting the digital sound signal restored by the sound restorer into an analog sound signal; An amplifier for amplifying the magnitude of the acoustic signal converted by the codec; A speaker for converting the amplified sound signal and outputting the sound; A text restorer for restoring a data signal included in the broadcast signal demodulated by the baseband processor to a text signal; A display unit for displaying the characters restored by the character restorer on a screen; A transmitter for interconnecting the baseband processor and the PC so that the broadcast signal demodulated by the baseband processor can be restored on the PC so that the user can receive the digital multimedia broadcasting service from the PC; A power controller capable of reducing power consumption by controlling power applied to the tuner unit, the baseband processor, the codec, the amplifier, and the display unit; An auxiliary memory device capable of storing audio files compressed in a moving picture expert group (MPEG) method; An operation key for selecting digital multimedia broadcasting audio and playing a compressed audio file stored in the auxiliary memory device, and allowing a user to conveniently control selection, playback, stop, and volume control of the audio; And The tuner unit, the baseband processor, the acoustic restorer, the codec, the amplifier, the character restorer, the display unit, the transmitter, the power controller, the auxiliary storage device, and the operation. A microprocessor that controls a key and determines a connection state between the transmitter and the PC, The power controller, When the connection between the transmitter and the PC is confirmed by the microprocessor, the power of the codec, the amplifier and the display unit is automatically cut off, and the reproduction of the compressed audio file stored in the auxiliary memory device is selected by the operation key. In this case, the digital multimedia broadcasting receiver, characterized in that for automatically shutting off the power of the tuner and the baseband processor. delete The method of claim 1, The sound restorer may restore an audio file stored in the auxiliary memory device to a digital sound signal, and may include MP3 (MPEG Audio Layer-3) format, WMA (Windows Media Audio) format, OGG (Ogg Vorbis) format, and MPEG. -4 A digital multimedia broadcasting receiver, comprising: restoring an audio signal for an audio file compressed by a selected one of bit sliced arithmetic coding (BSAC) formats. delete The method of claim 1, The display unit may display a file name, a compression scheme, a compression ratio, a digital multimedia broadcasting reception information, and a reception state of the compressed audio file stored in the auxiliary memory device, and are controlled by the microprocessor. Digital multimedia broadcasting receiver.

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