KR100490258B1 - Digital audio broadcasting receier and operating methode thereof - Google Patents

Abstract

The present invention relates to a digital audio (multimedia) broadcast receiver and a method of operation thereof. The digital audio broadcasting receiver of the present invention includes an MP3 play function, and when storing a digital audio broadcasting signal, a broadcast name and a stored memory address are indexed, and the data service signal and the audio service signal are stored separately. According to the present invention, it is possible to store digital audio broadcast signals while listening to MP3 music files, and to store broadcasts of other channels while listening to broadcasts of one channel. In addition, the data service signal as well as the audio service signal can be reproduced and stored, and the desired signal among the broadcast service signals stored in the memory can be easily searched and reproduced through the index.

Description

DIGITAL AUDIO BROADCASTING RECEIER AND OPERATING METHODE THEREOF}

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

Digital Audio Broadcasting (DAB) is a 3rd generation radio following AM (Amplitude Modulation) and FM (Frequence Modulation), and it provides multimedia such as text, graphics, video, as well as compact disc (CD) high quality voice. In the times is the next generation radio broadcast, providing a variety of data services, excellent mobile reception quality. 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.

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.

Digital audio broadcasting systems can be broadly classified into the out-of-band (Eureka) -147 method jointly proposed by Pan-Europe and the in-band (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.

On the other hand, the DAB can service a plurality of broadcasts in 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 DAB, audio data is MPEG-1 layer-2 (MUSICAM).

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

1 shows a multiplexed transmission frame structure of such a digital audio broadcast signal.

As shown in FIG. 1, a multiplexed frame of a digital audio broadcast 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).

A conventional digital audio receiver for receiving a digital audio broadcast signal having such a structure selects and decodes only one broadcast (service) among these multiplexed frames, and discards the unselected broadcast. Therefore, even in the case of a digital audio receiver having a built-in memory, since there is no separate device for managing the memory, it is possible to record the broadcast while listening to the selected music broadcast, but it is impossible to record all the broadcast services.

In addition, even if the digital audio broadcast receiver has a built-in MP3 player function, it is impossible to store digital audio broadcasts while listening to MP3 music, and there is no function to search for and listen to a desired broadcast among the broadcasts stored in the memory.

An object of the present invention is to provide a digital audio broadcast receiver capable of storing another broadcast while listening to one broadcast when a plurality of broadcasts are serviced through one channel.

Another object of the present invention is to provide a digital audio broadcast receiver having an MP3 player function and having an MP3 player function capable of listening to MP3 music while storing a broadcast being transmitted.

Another object of the present invention is to provide a digital audio broadcast receiver capable of easily searching for a desired broadcast among a plurality of stored broadcasts.

According to an aspect of the present invention, a digital audio broadcast receiver for receiving a digital audio broadcast includes a tuner for tuning a desired channel in a digital audio broadcast signal flowing through an antenna; A signal processor which processes the broadcast signal output from the tuner and outputs the analog broadcast signal; A decoder which decodes and outputs a broadcast signal output from the signal processor; An output unit for outputting audio or data of a corresponding broadcast signal according to the signal output from the decoding unit; A controller configured to control and synchronize broadcast signal reception, storage, and output according to the digital audio broadcast reception mode and the broadcast storage mode; A memory in which the audio service signal and the data service signal are stored; And a memory management unit which receives a signal other than the broadcast signal output to the decoding unit, divides the audio service signal and the data service signal into the memory, and stores each service signal in the memory when the broadcast storage mode is selected among the digital audio broadcast reception modes. It includes.

In this case, an MP3 file is further stored in the memory.

The controller may control to output an MP3 file stored in the memory according to the MP3 play mode.

In addition, when the broadcast storage mode is selected among the MP3 play modes, the memory manager may receive a broadcast signal output from the signal processor and divide the audio service signal into a data service signal and store each service signal in the memory. .

According to another aspect of the present invention, a digital audio broadcast receiver includes: a tuner for tuning a desired channel in a digital audio broadcast signal flowing through an antenna; A signal processor which processes the broadcast signal output from the tuner and outputs the analog broadcast signal; A decoder which decodes and outputs a broadcast signal output from the signal processor; An output unit for outputting audio or data of a corresponding broadcast signal according to the signal output from the decoding unit; A control unit controlling reception, storage and output of a broadcast signal according to a digital audio broadcast reception mode and a broadcast storage mode, and an output of an MP3 file according to an MP3 play mode; A memory in which the audio service signal, the data service signal and the MP3 music file are stored; And a memory manager configured to receive a broadcast signal output from the signal processor, divide the audio service signal into a data service signal, and store each service signal in the memory when the broadcast storage mode is selected among the MP3 play modes.

In this case, when the capacity of the memory is exceeded in the broadcast storage mode, the memory manager may overwrite the broadcast signal on the already stored file or stop storing.

According to another aspect of the present invention, a method of listening and storing an MP3 music file and an audio broadcast in a digital audio broadcast receiver includes: a) decoding a broadcast signal of one channel received through an antenna when a digital audio broadcast reception mode is selected; Outputting a corresponding broadcast signal; b) if a broadcast storage mode is selected during the reception of the digital audio broadcast, storing a broadcast signal other than the received and output broadcast signal in a memory; c) when the MP3 play mode is selected, searching for and playing the selected file among the MP3 music files stored in the memory; And d) if the broadcast storage mode is selected during the playback of the MP3 music file, storing the received broadcast signal in a memory.

In addition, the method may further include selecting and playing a desired signal among the broadcast signals stored in the memory.

In step b) and step d), the broadcast name of the broadcast signal stored in the memory and the address of the memory where the broadcast signal is stored are indexed and stored in the memory separately from the broadcast signal,

In step e), a desired broadcast signal may be selected and reproduced through the broadcast name of the index stored in the memory.

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 audio broadcast receiver according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

2 illustrates a structure of a digital audio broadcasting receiver (hereinafter, referred to as a digital audio broadcasting receiver) in which an MP3 player function is incorporated according to an embodiment of the present invention.

As shown in FIG. 2, the digital audio broadcasting receiver according to the embodiment of the present invention includes a tuner 110, a signal processor 120, a decoder 130, an output 140, a user interface 150, and a controller ( 160, a memory manager 170, and a memory 180. The signal processor 120 includes an analog / digital (A / D) converter 121, a discrete fourier transform (DFT) / demodulator 122, and a T / F deinterleaving & error correction unit 123. The unit 130 includes an audio decoder 132 and a data decoder 131. In addition, the output unit 140 includes a data output processor 141, a D / A converter 142, a speaker 143, and a display unit 144.

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 the error. The audio decoder 132 and the data decoder 131 digitize the broadcast signal, that is, the audio broadcast signal and the data. Decode and output each broadcast signal.

In addition, the controller 160 selects a digital audio broadcasting reception mode (DAB reception mode) and an MP3 play mode, and controls and synchronizes operations of each unit according to the selected mode, and the user interface (Graphic 150) It is responsible for the interface between the user and the controller 160.

The broadcast signal and the MP3 music file are stored in the memory 180, and the memory manager 170 manages the broadcast signal and the MP3 music file stored in the memory 180 and the memory 180. That is, the memory manager 170 deletes the broadcast signal and the MP3 music file stored in the memory 180 or manages an area in which the broadcast signal is stored and an area in which the MP3 music file is stored in the memory 180. In this case, the area in which the broadcast signal is stored and the area in which the MP3 music file is stored may be integrated or managed separately. In addition, the memory manager 170 may select a memory management method when the storage capacity of the memory 180 is exceeded. That is, when storing the broadcast signal, if the capacity of the memory 180 is exceeded and it is no longer possible to store it, the user may overwrite the already stored file or display an error message through the user interface 150 and stop storing. .

The data output processor 141 converts the PAD (Program Associated Data) of the data service signal decoded by the data decoder 131 into a text form and outputs the converted text through the display unit 144. Data is output to the outside through a separate interface (not shown). The D / A converter 142 converts the digital signal output from the audio decoder 132 into an analog signal. In addition, the display unit 144 displays the PAD output from the data output processing unit 141, and the speaker 143 outputs the converted audio signal from the D / A converter 142.

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

First, in the case of operating in the DAB reception mode, the tuner 110 separates one frequency channel from the multiple channel signal 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 fast information channel (FIC) and main service channel (MSC), and the FIC is multiplexed array information ( MCI).

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

On the other hand, if the control unit 160 selects the broadcast signal storage function, the audio service signal of the broadcast currently being selected and listened to among the service signals output from the T / F deinterleaving & error correction unit 123 is transmitted to the audio decoder 132. And other broadcast service signals are stored in memory 180. At this time, the audio service signal transmitted to the audio decoder 131 is decoded and then converted into an analog signal in the D / A 142 and finally output through the speaker 143.

On the other hand, before storing the service signal in the memory 180, the memory manager 170 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 180 separately from the broadcast service signal. In addition, when storing the received broadcast service signal in the memory 180, the memory manager 170 distinguishes whether the received broadcast service signal is an audio service signal or a data service signal, and stores the received broadcast service signal separately.

3 shows an example of the structure of data stored in the memory 180 in this manner.

As shown in FIG. 3, the memory 180 is divided into an index unit 210 and a broadcast signal storage unit 220. The index 210 stores an index of each service signal, that is, a broadcast name and a storage location of the service signal, and the broadcast signal storage 220 stores audio service signals Audio 1, Audio 2, and Audio 3. Data service signals Data 1 and Data2 are stored.

As such, since the digital audio broadcasting receiver according to the embodiment of the present invention includes a memory manager 170 for managing the memory 180, it is preferable to separate the audio service signal and the data service signal and store them in the memory 180. In addition, by creating an index with a service name and a storage address and storing the index in a memory 180 separately from the service signal, a desired signal among the stored signals can be searched and listened to.

In the case of operating in the MP3 play mode, the controller 160 displays a list of MP3 music files stored in the memory through the display unit 144. When the user selects the desired MP3 music file through the user interface 150, the controller 160 requests the memory manager 170 for the selected MP3 music file. Then, the memory manager 170 finds the MP3 music file in the memory 180 and sends the MP3 music file to the audio decoder 132, the audio decoder 132 decodes the MP3 music file, and the D / A 142 uses an analog signal. The conversion is finally output through the speaker 143.

In addition, when the audio service signal of the DAB is received and reproduced in real time, the audio service signal of the DAB uses the MPEG-1 layer-2 (MUSICAM) method, and thus an audio decoder 132 for decoding an MP3 music file may be commonly used. have. In this case, as described above, the memory manager 170 may manage the memory 180 by integrating or separately managing the DAB storage area and the MP3 file storage area.

On the other hand, if the broadcast storage function is selected while operating in the MP3 player mode, as described above, the service signal is first transmitted to the memory manager 170, and the memory manager 170 creates an index and classifies the types of service signals. Each is stored in memory 180.

Meanwhile, when storing the broadcast signal while operating in the DAB receiving mode or the MP3 play mode, when the capacity of the memory 180 is exceeded and no further storing is possible, the memory manager 170 overwrites the already stored file according to the preset mode. Or display an error message through the user interface 150 and stop storing.

Meanwhile, when reproducing a broadcast service signal stored in the memory 180, the memory manager 170 displays an index (particularly, a broadcast name) stored in the memory 180 through the display unit 144, thereby allowing the user to display a user interface ( 150 to select the desired service signal. When one service signal is selected in this way, the controller 160 transmits the service signal stored in the storage address of the corresponding signal recorded in the index to the data decoder 131 or the audio decoder 132 according to the type of the service signal.

At this time, the audio service signal is decoded by the MPEG-1 layer-2 (MUSICAM) in the audio decoder 132, and converted to an analog signal through the D / A (142) and output through the speaker 143, the data service signal is It is decoded by the data decoder 131 and output to the data output processor 141. The data output processor 141 converts a PAD (Program Associated Data) of the decoded data service signal into a text form and outputs it through the display unit 144, and other data is provided through a separate interface. It is output to the outside through. For example, if the data includes a video, it is transmitted to an external PC or the like so that the video can be played through the PC.

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 with respect to DAB which is the EUREKA-147 method, the present invention can be applied to all kinds of digital audio broadcasting as well as the IN-BAND method. In addition, the memory 180 used in the present invention may include both a removable and a fixed memory, and may include both a nonvolatile memory such as a flash memory.

The digital audio broadcasting receiver of the present invention can also be applied to a CD-MP3 player using a CD-ROM DISC 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 or CD-RW as recording and reproducing medium.When saving to CD-R / RW, first write a certain amount to buffer memory and then write to CD-R / RW. Record it. This buffer is used as a place to read files from disk and temporarily store them when playing MP3 files.

According to the present invention, it is possible to store digital audio broadcast signals while listening to MP3 music files, and to store broadcasts of other channels while listening to broadcasts of one channel. In addition, not only an audio broadcast service signal but also a data broadcast service signal may be reproduced and stored, and a desired signal among broadcast service signals stored in a memory may be easily searched and reproduced through an index.

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

2 is a diagram showing the structure of a digital audio broadcasting receiver with a built-in MP3 player function according to an embodiment of the present invention.

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

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

110: tuner 120: signal processing unit

121: A / D converter 122: DFT / demodulator

123: T / F Deinterleaving & Error Correction

130: decoding unit 131: audio decoder

132: data decoder 140: output unit

141: data output processing unit 142: D / A conversion unit

143: Speaker 144: Display

150: user interface 160: control unit

170: memory management unit 180: memory

Claims (11)

A digital audio broadcasting receiver for receiving digital audio broadcasting, A tuner for tuning a desired channel in a digital audio broadcast signal introduced through an antenna; A signal processor which processes the broadcast signal output from the tuner and outputs the analog broadcast signal; A decoder which decodes and outputs a broadcast signal output from the signal processor; An output unit for outputting audio or data of a corresponding broadcast signal according to the signal output from the decoding unit; A control unit controlling reception, storage, and output of a broadcast signal according to a digital audio broadcast reception mode and a broadcast storage mode; A memory in which the audio service signal and the data service signal are stored; And When the broadcast storage mode is selected among the digital audio broadcast reception modes, a memory management unit receives signals other than the broadcast signals output to the decoding unit, divides them into audio service signals and data service signals, and stores each service signal in the memory. Digital audio broadcast receiver comprising a. The method of claim 1, The memory further stores MP3 files, The controller controls the MP3 file stored in the memory to be output according to the MP3 play mode. Digital audio broadcast receiver. The method of claim 2, When the broadcast storage mode is selected among the MP3 play modes, the memory manager receives a broadcast signal output from the signal processor, classifies the audio service signal and the data service signal, and stores each service signal in the memory. Digital audio broadcast receiver. A digital audio broadcasting receiver for receiving digital audio broadcasting, A tuner for tuning a desired channel in a digital audio broadcast signal introduced through an antenna; A signal processor which processes the broadcast signal output from the tuner and outputs the analog broadcast signal; A decoder which decodes and outputs a broadcast signal output from the signal processor; An output unit for outputting audio or data of a corresponding broadcast signal according to the signal output from the decoding unit; A control unit controlling reception, storage and output of a broadcast signal according to a digital audio broadcast reception mode and a broadcast storage mode, and an output of an MP3 file according to an MP3 play mode; A memory in which the audio service signal, the data service signal and the MP3 music file are stored; And When the broadcast storage mode is selected among the MP3 play mode, the memory management unit receives a broadcast signal output from the signal processing unit, divides the audio service signal into a data service signal, and stores each service signal in the memory. Digital audio broadcast receiver comprising a. The method according to claim 1 or 4, The decoding unit, A data decoder for decoding the data service signal; An audio decoder for decoding the audio service signal; A data output processor configured to convert a PAD (Program Associated Data) of the data service signals output through the data decoder into a text form; And Digital to analog (D / A) conversion unit converts the signal output from the audio decoder to an analog signal and transmits it to the speaker Including; The output unit, A speaker for outputting audio corresponding to an audio service signal output from the audio decoder; And A display unit which displays a data service signal output from the data output processor Digital audio broadcast receiver comprising a. The method according to claim 1 or 3 or 4, 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 audio broadcast receiver. The method according to claim 1 or 4, In the broadcast storage mode, The memory manager, When the capacity of the memory is exceeded to overwrite the broadcast signal over a file already stored or to stop storing Digital audio broadcast receiver. In the digital audio broadcast receiver with a built-in MP3 player function, a method for listening to and storing MP3 music files and audio broadcasts, a) if the digital audio broadcasting reception mode is selected, decoding a broadcast signal of one channel received through an antenna and outputting the corresponding broadcast signal; b) if a broadcast storage mode is selected during the reception of the digital audio broadcast, storing broadcast signals other than the received and output broadcast signals in a memory; c) when the MP3 play mode is selected, searching for and playing the selected file among the MP3 music files stored in the memory; And d) if the broadcast storage mode is selected during the playback of the MP3 music file, storing the received broadcast signal in a memory; Method of operation of a digital audio broadcast receiver comprising a. The method of claim 8, e) selecting and playing a desired signal among the broadcast signals stored in the memory; Operation method of the digital audio broadcast receiver further comprising. The method of claim 9, In step b) and d), 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 e), Selecting and playing a desired broadcast signal through the broadcast name of the index stored in the memory Operation method of digital audio broadcasting receiver. The method of claim 8, In step b) and d),  When storing the broadcast signal, if the capacity of the memory is exceeded and no more storage is possible, overwriting or stopping the storage of the already stored file is performed. Operation method of digital audio broadcasting receiver.