KR100511553B1 - Digital multimedia broadcasting receiver and operating methode thereof - Google Patents

Abstract

The present invention relates to a digital multimedia broadcasting receiver and a method of operating the same. When the digital multimedia broadcasting receiver mode is selected, the digital multimedia broadcasting receiver of the present invention divides a broadcast signal of one channel received through an antenna into an audio service signal or a data service signal, and the audio signal is decoded through an audio decoder. Outputs the audio, and the data service signal examines the format of the data, decodes it with a decoder suitable for the format of the data, and outputs the corresponding data; when the broadcast storage mode is selected during the reception of the digital multimedia broadcasting, the received data is output. A broadcast signal other than the broadcast signal is stored in the memory. In this way, the data broadcast service signal of the digital multimedia broadcasting signal can be stored separately by checking the format of the data.

Description

DIGITAL MULTIMEDIA BROADCASTING RECEIVER AND OPERATING METHODE THEREOF}

The present invention relates to a digital audio (multimedia) broadcast receiver and a method of operation thereof.

Digital Audio Broadcasting (DAB) is a third generation radio following AM (Amplitude Modulation) and FM (Frequence Modulation), as well as compact disc (CD) high quality audio, news, traffic information, weather information, location information. It is a next generation radio broadcast that provides a variety of data services, excellent mobile reception quality in the age of multimedia, such as text, graphics, video, including. These DABs have functions such as high quality audio, display, various data services, and bidirectionality in conventional unidirectional listening radios.

On the other hand, DAB has been renamed and used in Korea as Digital Multimedia Broadcasting (DMB) in accordance with ITU regulations that include video, text, etc. in addition to audio.

DMB is an advanced system that not only provides users with fully digitized information, but also has various applications in terms of quality and quantity. In addition, DMB can transmit voice programs and data programs at different data rates at the same time, and the Program Associated Data (PAD) service, which provides data services by including them in voice programs, and independently of text, graphics, and video regardless of voice programs. Non Program Associated Data (NPAD) services that provide programs are possible. In particular, the NPAD service may be used to provide content such as train and plane timetables, stock information, weather information, performance information, news, and the like.

The receiver of the DMB is PC (PC) -card type, home audio type, automotive, etc., and is classified into a terrestrial broadcasting service using a terrestrial broadcasting station and a satellite broadcasting service using a satellite according to the nature of the medium as a transmission means.

Satellite broadcasting is used to launch video and audio signals produced by a broadcasting station through a transmitting earth station and send signals to a receiving earth station in the distance using a satellite, which is a stationary satellite floating over the equator, as a terrestrial digital broadcasting earth station. Is transmitted to the satellite for digital broadcasting, and the signal received from the satellite is downstream through the L-band.

In addition, in a broadcast system using terrestrial waves, a digital broadcasting station directly outputs a digital broadcast. Broadcast signals output by these two methods are received by mobile and fixed digital receivers.

Such digital multimedia broadcasting systems can be broadly classified into the out-of-band (Eureka) -147 method jointly proposed by Pan-Europe and the in-band method proposed by the United States.

The EUREKA-147 method uses a new frequency band other than the FM band in which analog broadcasting is provided, and features the use of the new frequency band and broadband transmission. In addition, the EUREKA-147 scheme has a frequency band of 30 MHz to 3 GHz, that is, Very High Frequency (VHF), Ultra High Frequency (UHF), and L-band (1-2 GHz) / S-band (S-band; 2). ~ 4㎓) Because it can operate in the band (satellite broadcasting band), it is possible to broadcast terrestrial broadcasting through the current FM band and TV band and satellite broadcasting through the L / S band. Therefore, since the frequency can be efficiently used through improved reception performance, high-speed data transmission, and single frequency network configuration due to broadband transmission, it is known to be the best among digital audio broadcasting systems developed to date.

In-band method is a method of sharing the frequency band used by conventional analog broadcasting, and uses IBOC (In-Band On-Channel) method for transmitting digital audio signal to AM or FM channel and adjacent channel of FM channel. IBAC (In-Band Adjacent-Channel) method has been proposed.

In addition, there is an ISDB-TSB (Integrated Service Digital Broadcasting-Terrestrial Sound Broadcasting for Radio) method, which is also an out of band method.

On the other hand, the EUREKA-147 DAB can service multiple broadcasts on one frequency channel. That is, in the DAB, the bandwidth of the modulated wave is 1.5 MHz, and the number of services and the superimposed code rate R used for the error code are freely set within the maximum capacity (about 2.3 Mbps). In fact, high-quality services such as music broadcasting use stereo data rate of 192Kbps and often set R = 0.5. In this case, six services can be multicasted. In addition, when serviced by the EUREKA-147 DAB, the audio data is MPEG-1 layer-2 (MUSICAM).

Since the digital multimedia broadcasting has a multiplexed frame structure, it is possible to send several broadcasts (services) on one frequency channel.

1 illustrates a multiplexed transmission frame structure of such a digital multimedia broadcasting signal.

As shown in FIG. 1, a multiplexed frame of a digital multimedia broadcasting signal includes a synchronization channel, a fast information channel (FIC), and a main service channel (MSC). The FIC includes multiplexed array information (MCI) and service information (SI), and the MSC includes a plurality of audio data (Radio 1, Radio 2, Radio 3, Radio 4) and a plurality of non-audio data and service information ( SI).

Conventional digital audio receivers receiving digital multimedia broadcasting signals having such a structure can reproduce music broadcasts, but in the case of data broadcasting, only a function of outputting data through a decoder is provided. In the case of a multimedia format, the desired information has to be obtained by performing an appropriate decoding from the outside.

Accordingly, an object of the present invention is to provide a digital multimedia broadcasting receiver which automatically decodes and reproduces data transmitted through data broadcasting according to each format.

In addition, the technical problem to be achieved by the present invention is to store and store a plurality of broadcasts serviced through one channel as audio broadcasts and data broadcasts according to each content, and to easily search for the desired broadcasts among the stored plurality of broadcasts in the data format. It is to provide a digital multimedia broadcasting receiver that can be decoded and played back or output to the outside.

In order to solve the above problems, a digital multimedia broadcasting receiver for receiving a digital multimedia broadcasting according to an aspect of the present invention may tune a desired channel from a digital multimedia broadcasting signal flowing through an antenna, process the broadcasting signal, and output the digital broadcasting signal as a digital broadcasting signal. A signal processor; A decoder for extracting an audio service signal and a data service signal from the broadcast signal output from the signal processor; A memory in which the audio service signal and the data service signal are stored; A memory manager configured to receive a signal other than the broadcast signal output to the decoder, divide the audio service signal into a data service signal, and store each service signal in the memory when a broadcast storage mode is selected during the reception of the digital multimedia broadcasting; An audio output unit configured to output audio of a corresponding broadcast signal according to the signal output from the decoder; A data output unit for inspecting a data format of a data service signal output from the decoder and decoding and outputting the data signal according to the data format; And a controller for controlling operations of the signal processor, the memory manager, and the decoder.

In addition, according to another aspect of the present invention, a digital multimedia broadcasting receiver includes: a signal processing unit for selecting a desired channel from a digital multimedia broadcasting signal flowing through an antenna, processing a broadcast signal, and outputting the digital broadcasting signal; A decoder for extracting an audio service signal and a data service signal from the broadcast signal output from the signal processor; A memory in which the audio service signal and the data service signal are stored; A memory manager configured to receive a signal other than the broadcast signal output to the decoder, divide the audio service signal into a data service signal, and store each service signal in the memory when a broadcast storage mode is selected during the reception of the digital multimedia broadcasting; An audio output unit for inspecting a data format of an audio service signal output from the decoder and decoding and outputting the audio signal according to the data format; A data output unit configured to output data of a corresponding broadcast signal according to a data service signal output from the decoder; And a controller for controlling operations of the signal processor, the memory manager, and the decoder.

A method of operating a digital multimedia broadcasting receiver according to an aspect of the present invention includes the steps of: a) dividing a broadcast signal of one channel received through an antenna into an audio service signal or a data service signal; b) decoding the audio signal through an audio decoder and outputting corresponding audio; And c) checking the data format of the data service signal, decoding the data format with a decoder suitable for the format of the data, and outputting the corresponding data.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

First, a digital multimedia broadcasting receiver according to a first embodiment of the present invention will be described in detail with reference to FIG.

2 shows a structure of a digital multimedia broadcasting receiver according to a first embodiment of the present invention.

As shown in FIG. 2, the digital multimedia broadcasting receiver according to the first embodiment of the present invention includes a signal processing unit 120, a decoder 130, an output unit 140, a user interface 160, a DMB control unit 170, The memory manager 180 and the memory 190 are included.

The signal processor 120 includes a tuner 110, an analog / digital (A / D) converter 121, a discrete fourier transform (DFT) / demodulator 122, and a T / F deinterleaving & error correction unit 123. The decoder 130 includes an audio decoder 132 and a data extractor 131.

In addition, the data output unit 140 includes a data format detection unit 141, a decoding unit 142, a display unit 143, and an external interface unit 144, and the audio output unit 150 includes a D / A conversion unit. 151 and speaker 152.

The tuner 110 tunes a digital broadcast signal of a desired channel from the signal flowing through the antenna and outputs the digital broadcast signal to the A / D converter 121. The A / D converter 121 converts an analog broadcast signal into a digital broadcast signal, and the DFT / demodulator 122 detects and demodulates frequency characteristics in the digital broadcast signal. The T / F deinterleaving & error correction unit 123 rearranges the interleaved signal and corrects an error. The audio decoder 132 decodes and outputs an audio broadcast signal, which is a digitized broadcast signal. In addition, the data extractor 131 extracts data from the data broadcast signal.

In addition, the DMB controller 170 selects a digital multimedia broadcasting reception mode (DMB reception mode) and a playback mode, and controls and synchronizes operations of each unit according to the selected mode, and the user interface (Graphic User Interface; GUI) 160 It is responsible for the interface between the user and the DMB control unit 170.

The memory 190 stores the received broadcast signal divided into an audio signal and a data signal. The memory manager 180 manages the broadcast signal data stored in the memory 190 and the memory 190, deletes the broadcast signal data stored in the memory 190, or exceeds the storage capacity of the memory 190. You can choose how you want to manage your memory. That is, when storing the broadcast signal, if the capacity of the memory 190 is exceeded and it is no longer possible to store the data, the user may overwrite the already stored file or display the error message through the user interface 160 and stop the saving. have.

The data format detecting unit 141 checks the format of the data extracted by the data extracting unit 131 to determine whether it is moving picture data such as MPEG-4, still picture data, or plain text data. That is, in the case of moving picture or still picture data, the format header can be distinguished from each other, and data other than the moving picture and the still picture is determined as text.

The data service signal in which the format check is completed is decoded by a decoder suitable for each data format by the decoding unit 142 and converted into reproducible data and output through the display unit 143. In this case, the decoder is a software decoder for digital signal processing (DSP), and a decoder for decoding data of various formats is stored in a memory. Therefore, the decoder 142 loads a decoder suitable for the format of the data detected by the data format detector 141 to decode each data. In addition, the decoded data may be reproduced through an external I / F 144 such as a PC connected to a digital multimedia broadcasting receiver according to an embodiment of the present invention. The device may be output to the outside through the external interface (I / F) unit 144.

The D / A converter 151 converts the digital audio signal decoded by the audio decoder 132 into an analog audio signal. In addition, the speaker 152 outputs the audio signal converted by the D / A converter 151.

Hereinafter, the operation of the digital multimedia broadcasting receiver according to the first embodiment of the present invention will be described in detail.

First, in the case of operating in the DMB reception mode, the tuner 110 separates one frequency channel from the multiple channel signals received from the antenna to obtain an analog signal. The analog signal is converted into a digital signal by the A / D converter 121, and then demodulated after the Discrete Fourier Transform through the DFT & demodulator 122. The demodulated signal is deinterleaved over time and frequency in the T / F deinterleaving & error correction 123. In addition, the T / F deinterleaving & error correction unit 123 separates the demodulated signal into a fast information channel (FIC) and a main service channel (MSC). In this case, the FIC includes multiplexed array information (MCI).

Through this process, audio broadcast data (hereinafter referred to as an audio service signal) and non-audio broadcast data such as text or video (hereinafter referred to as a data service signal) are obtained through a main service channel. If the service signal thus obtained is a data service signal, it is transmitted to the data extraction unit 131, and if it is an audio service signal, it is sent to the audio decoder 132.

At this time, the audio service signal transmitted to the audio decoder 132 is decoded and then converted into an analog signal by the D / A converter 151 and finally output through the speaker 152. In addition, the data service signal extracts data from the data extractor 131, checks the format of the data by checking the format of the data in the data format detector 141, and then decodes the decoder 142 to a decoder suitable for each data format. The decoded data is converted into playable data and output through the display unit 143 or the external I / F 144.

On the other hand, if the DMB controller 170 selects the broadcast signal storage function, the broadcast signal currently selected and listening among the service signals output from the T / F deinterleaving & error correction unit 123 is extracted from the audio decoder 132 or data extraction. The remaining broadcast signals are sent to the unit 131 and stored in the memory 190. The broadcast signals sent to the audio decoder 132 or the data extractor 131 are output through the speaker 152, the display unit 143, or the external I / F 144, respectively, according to the operation sequence described in the above-described broadcast reception mode. do.

On the other hand, before storing the service signal in the memory 190, the memory manager 180 designates the address where each broadcast service signal is to be stored, and selects only the address where the broadcast service name and the broadcast service signal of each broadcast service signal are stored. Create an index. The index thus created is stored in the memory 190 separately from the broadcast service signal. In addition, when storing the received broadcast service signal in the memory 190, the memory manager 180 distinguishes whether the received broadcast service signal is an audio service signal or a data service signal and stores each separately. In the case of the data service signal, each of the data service signals is classified into a still picture signal, a video signal, a text signal, and the like, and stored separately.

3 shows an example of the structure of data stored in the memory 190 in this manner.

As shown in FIG. 3, the memory 190 is divided into an index unit 210 and a broadcast signal storage unit 220. An index 210 of each service signal, that is, a broadcast name and a storage location of the service signal is recorded in the index unit 210, and the audio service signals Audio 1 and Audio 2 and the data service signal are stored in the broadcast signal storage unit 220. (Data 1, Data2, Data3) are stored. In this case, Data 1 to Data 3 represent a text signal, a still image signal, and a video signal, respectively.

As such, since the digital multimedia broadcasting receiver according to the first embodiment of the present invention includes a memory manager 180 that manages the memory 190, not only the audio service signal and the data service signal are separated, but also the data service signal. Can be stored in the memory 190 by type, and the index can be created using the service name and the storage address, and stored in the memory 190 separately from the service signal to search for and listen to a desired signal among the stored signals.

Meanwhile, when reproducing a broadcast service signal stored in the memory 190, the memory manager 180 displays an index (particularly, a broadcast name) stored in the memory 190 on the display unit 143 so that the user may display a user interface ( Through the 160, the desired service signal can be selected. When one service signal is selected in this way, the DMB controller 170 transmits the service signal stored in the storage address of the corresponding signal recorded in the index to the data extractor 131 or the audio decoder 132 according to the type of the service signal. .

After that, the process of decoding and outputting the audio service signal and the data service signal is the same as the above-described method, and thus description thereof is omitted.

In the first embodiment of the present invention, various data service signals have been described. However, the digital multimedia receiver of the present invention can be applied to various audio service signals. Hereinafter, this embodiment will be described in detail with reference to FIG. 4.

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

As shown in FIG. 4, the digital multimedia broadcasting receiver according to the second embodiment of the present invention has the same structure as the first embodiment except for the decoder 230, the data output unit 240, and the audio output unit 250. Have In detail, the decoder 230 of the digital multimedia broadcasting receiver according to the second embodiment of the present invention includes a video data extractor 231 and an audio data extractor 232, and the data output unit 240 includes a video. A data format detector 241, a video decoder 242, and a display 243. The audio output unit 250 includes an audio data format detector 251, an audio decoder 252, and a speaker 253. do.

The audio data extractor 232 extracts audio data from an audio service signal that is a digitized broadcast signal. The audio data format detector 251 checks the format of the audio data by checking the format of the data extracted by the audio data extractor 232, and decodes and reproduces the audio data by the decoder suitable for each data format. The audio data is converted and output through the speaker 253. In this case, the audio decoder is also a software decoder for digital signal processing (DSP), and a decoder for decoding data of various formats is stored in a memory.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

That is, in the embodiment of the present invention mainly described for the DMB which is the EUREKA-147 method, the present invention can be applied to all kinds of digital multimedia broadcasting as well as the IN-BAND method.

In addition, in the exemplary embodiment of the present invention, the still picture, the text, the moving picture signal, etc. have been described as the data service signal. However, the present invention may be applied to various types of data service signals, and the decoding unit may be added as the data service signal is added. A decoder of 142 can also be added.

Further, the digital multimedia broadcasting receiver of the present invention can be applied even when the data of the data service signal is in one format and the data of the audio service signal is in various formats.

In addition, the memory 190 used in the present invention includes both a removable and a fixed memory, and may include both a nonvolatile memory such as a flash memory.

In addition, the digital multimedia broadcasting receiver of the present invention can be applied even when a CD-R / RW, DVD-RAM and DVD-R / RW disc are used as a storage and playback medium without using a memory as a storage medium. In this case, set aside buffer memory to be used as data buffer, and use CD-R / RW or DVD-RAM and DVD-R / RW as recording and reproducing media. Write to disc later.

According to the present invention, the digital multimedia broadcasting signal may be divided into an audio broadcasting service signal and a data broadcasting service signal. In the case of a data broadcast service signal, the format of the data can be inspected and stored separately.

In addition, it is possible to easily search for and reproduce a desired signal among audio and data broadcast service signals stored in a memory through an index, and in the case of a data broadcast service signal, it is possible to decode and reproduce the data according to a format.

1 is a diagram illustrating a multiplexed frame structure of a digital multimedia broadcasting according to the prior art.

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

3 illustrates an example of a structure of data stored in a memory of a digital multimedia broadcasting receiver according to an embodiment of the present invention.

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

*** Description of the symbols for the main parts of the drawings ***

120: signal processor 130: decoder

140: data output unit 141: data format detection unit

142: decode unit 150: audio output unit

160: user interface 170: control unit

180: memory management unit 190: memory

Claims (15)

A digital multimedia broadcasting receiver for receiving digital multimedia broadcasting, A signal processor that selects a desired channel from the digital multimedia broadcasting signal introduced through the antenna, processes the broadcasting signal, and outputs the broadcasting signal as a digital broadcasting signal; A decoder for extracting an audio service signal and a data service signal from the broadcast signal output from the signal processor; A memory in which the audio service signal and the data service signal are stored; A memory manager configured to receive a signal other than the broadcast signal output to the decoder, divide the audio service signal into a data service signal, and store each service signal in the memory when a broadcast storage mode is selected during the reception of the digital multimedia broadcasting; An audio output unit configured to output audio of a corresponding broadcast signal according to the signal output from the decoder; A data output unit for inspecting a data format of a data service signal output from the decoder and decoding and outputting the data signal according to the data format; And Control unit for controlling the operation of the signal processor, memory manager and decoder Digital multimedia broadcast receiver comprising a. The method of claim 1, The decoder, An audio decoder for decoding the audio service signal; And A data extraction unit for extracting data from the data service signal; Digital multimedia broadcast receiver comprising a. The method of claim 1, The data output unit, A data format detector for checking a format of each data output through the data extractor; A decoding unit for decoding the data into a decoder suitable for the detected data format; And A display unit for displaying the decoded data Including; And the decoder of the decoding unit is a software decoder for digital signal processing (DSP) and stored in the memory. The method of claim 1, The audio output unit, A digital to analog (D / A) converter for converting a signal output from the audio decoder into an analog signal; And A speaker for outputting audio converted into the analog signal Digital multimedia broadcast receiver comprising a. The method of claim 1, The memory includes an index unit and a broadcast signal storage unit, The memory manager, The audio service signal and the data service signal are classified and stored in the broadcast signal storage unit. An index including a storage location and a broadcast name of a memory in which the audio service signal or data service signal is to be stored is created and stored in the index unit. Digital Multimedia Broadcast Receiver. The method according to claim 1 or 5, The memory manager, Classifying and storing the data service signal according to each data format Digital Multimedia Broadcast Receiver. The method of claim 1, When the stored broadcast playback mode is selected, The memory manager, The broadcast signal to be reproduced is divided into an audio service signal and a data service signal and transmitted to the decoder. The audio service signal is reproduced through the decoder and the audio output unit, The data service signal is reproduced through the decoder and data output unit. Digital Multimedia Broadcast Receiver. The method of claim 1, The audio output unit, Inspecting a data format of an audio service signal output from the decoder and decoding and outputting the audio signal according to the data format Digital Multimedia Broadcast Receiver. The method of claim 8, The audio output unit, A data format detector for checking a format of each audio data output through the data extractor; A decoding unit for decoding the audio data into a decoder suitable for the detected data format; And A speaker for outputting the decoded audio Digital multimedia broadcast receiver comprising a. A digital multimedia broadcasting receiver for receiving digital multimedia broadcasting, A signal processor that selects a desired channel from the digital multimedia broadcasting signal introduced through the antenna, processes the broadcasting signal, and outputs the broadcasting signal as a digital broadcasting signal; A decoder for extracting an audio service signal and a data service signal from the broadcast signal output from the signal processor; A memory in which the audio service signal and the data service signal are stored; A memory manager configured to receive a signal other than the broadcast signal output to the decoder, divide the audio service signal into a data service signal, and store each service signal in the memory when a broadcast storage mode is selected during the reception of the digital multimedia broadcasting; An audio output unit for inspecting a data format of an audio service signal output from the decoder and decoding and outputting the audio signal according to the data format; A data output unit configured to output data of a corresponding broadcast signal according to a data service signal output from the decoder; And Control unit for controlling the operation of the signal processor, memory manager and decoder Digital multimedia broadcast receiver comprising a. In the method for receiving audio broadcasting and data broadcasting in a digital multimedia broadcasting receiver, a) dividing a broadcast signal of one channel received through an antenna into an audio service signal or a data service signal; b) decoding the audio signal through an audio decoder and outputting corresponding audio; And c) checking the data format of the data service signal, decoding the data format with a decoder suitable for the format of the data and outputting the corresponding data; Method of operation of a digital multimedia broadcasting receiver comprising a. The method of claim 11, c) storing a broadcast signal other than the received and output broadcast signal in a memory when a broadcast storage mode is selected during the reception of the digital multimedia broadcast; And d) when a broadcast play mode is selected, selecting and playing a desired signal among broadcast signals stored in the memory; Method of operation of a digital multimedia broadcasting receiver further comprising. The method of claim 12, C), The broadcast name of the broadcast signal stored in the memory and the address of the memory in which the broadcast signal is stored are indexed and stored in the memory separately from the broadcast signal, Step d), Selecting and playing a desired broadcast signal through the broadcast name of the index stored in the memory Operation method of digital multimedia broadcasting receiver. The method of claim 12, C), The broadcast signal is divided into the audio service signal and the data service signal and stored in the memory. The data service signals are separately stored according to the data format. Operation method of digital multimedia broadcasting receiver. The method of claim 14, Step d), Decoding and reproducing the data service signal according to the data format Operation method of digital multimedia broadcasting receiver.