KR20030086193A - Digital broadcasting Receiver - Google Patents

Abstract

PURPOSE: A digital broadcast receiver is provided to integrate a digital satellite broadcast receiver with a digital audio broadcast receiver and to share a control processor and a driving program. CONSTITUTION: A digital broadcast receiver includes an antenna(110) for receiving digital audio and video broadcasting signals, a central processing unit(190) for generating control signals, a digital video broadcast receiving unit(120) for processing the digital video broadcasting signal according to a control signal of the central processing unit, and a digital audio broadcast receiving unit(130) for processing the digital audio broadcasting signal according to a control signal of the central processing unit. The digital broadcast receiver further includes a program memory for simultaneously storing driving programs of the digital audio broadcast receiving unit and the digital video broadcast receiving unit, a data storage unit(150) for simultaneously storing digital audio/video broadcasting data processed by the digital audio broadcast receiving unit and the digital video broadcast receiving unit, a switch(160) for switching input of audio signals from the digital audio broadcast receiving unit and the digital video broadcast receiving unit, an audio output unit(180) for outputting the audio signal inputted from the switch, and a video output unit(170) for outputting the video signal inputted from the digital video broadcast receiving part.

Description

Digital broadcasting receiver {Digital broadcasting receiver}

The present invention relates to a digital audio broadcasting receiver, and more particularly, to a digital broadcasting receiver in which a digital audio broadcasting receiver and a digital video and video broadcasting receiver are configured to share a control processor, a driving program, and a data storage medium.

Digital Audio Broadcasting (DAB) is the third generation of radio following AM and FM. It is a next generation radio broadcasting that provides CD quality sound, various data services and excellent mobile reception quality in the multimedia age. Features high quality audio, display, a variety of data services and two-way interactivity on listening radios from the European Union's jointly proposed EUREKA-147 out-of-band and the United States' in-band (IN) -BAND) can be largely classified.

Here, the EUREKA-147 method jointly proposed by Pan-Europe, one of digital audio broadcasting, uses a new frequency band other than the FM band in which analog broadcasting is serviced, and uses a new frequency band and features broadband transmission. It can operate in the frequency band of 3GHz, that is, VHF, UHF and L / S band, so that terrestrial broadcasting through the current FM band and TV band and satellite broadcasting through the L / S band can be received from mobile vehicles due to broadband transmission. It is known to be the best digital audio broadcasting system developed to date because of improved performance, high speed data transmission, and efficient use of frequency through a single frequency network configuration.

In addition, the in-band (IN-BAND) method proposed by the United States is a method of sharing the frequency band used by the existing analog broadcasting, In-Band On-Channel (IBOC) method for transmitting a digital audio signal to the AM or FM channel In-Band Adjacent-Channel (IBAC) method using adjacent channel of FM and FM channel has been proposed.

Here, the IBOC method can improve the frequency efficiency in the dense area, but there is a problem of mutual interference with the existing analog signal, and the IBAC uses an empty guard band between FM broadcast channels to cope with the interference. Is relatively easy. The IBOC scheme can operate at less than 25dB lower power than the FM signal, but can interfere with analog signals. According to the experiment, 45dB level difference is required for the digital signal to not affect the quality of the FM signal. Therefore, in an FM receiver, interference of a digital signal must be reduced, and on the contrary, a digital audio broadcasting receiver needs a technique for extracting and removing an FM signal. The IBOC scheme is based on the OFDM modulation scheme used in the Eureka 147 scheme to overcome the problem of multipath fading. IBAC uses single carrier and adopts channel equalization technology.

In the digital broadcasting system as described above, as shown in FIG. 1, there is a service using a broadcast service satellite using terrestrial broadcasting at a terrestrial broadcasting station.

The above digital video broadcasting is a terrestrial digital broadcasting earth station that emits a video and audio signal produced by a broadcasting station through a transmitting earth station, and sends a signal to a receiving earth station far away by using a satellite, which is a stationary satellite floating over the equator, as a repeater. In digital signal transmission, a signal is transmitted to a satellite for digital broadcasting, and the transmitted signal is received at the satellite and downstream through the L-band.

In the above-described terrestrial broadcasting system, a digital broadcasting station directly outputs a digital broadcast.

Broadcast signals output by these two methods are received by mobile and fixed digital receivers.

In addition, digital video broadcasting is a system that transmits a broadcast signal to each terminal using a satellite, and may include multiple programs with one repeater, and one program may be multiplexed with audio, video, and various types of data. In addition, the digital video broadcasting receiver can receive this signal through a predetermined home antenna, receive the amplified signal, decode it, and deliver it to the subscriber.

In the related art, the digital audio broadcast receiver and the digital satellite broadcast receiver as described above are individually driven after being provided with a control processor, a driving program, and a storage medium for data storage, so that users cannot use both at the same time and mutually. Since it is impossible to interoperate, there has been a problem of using a memory, a processor, and a data storage medium twice.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiver comprising an integrated digital audio broadcast receiver and a digital video broadcast receiver in which a control processor, a driving program, and a data storage medium are shared. have.

1 is a view showing a concept of digital broadcasting according to the present invention;

2 is a schematic block diagram showing an internal block diagram of a digital broadcast receiver according to the present invention;

3 is a block diagram showing an internal configuration of a digital video broadcasting receiver according to the present invention.

4 is a block diagram showing an internal configuration of a digital audio broadcast receiver according to the present invention.

Description of the main symbols in the drawings

100: digital broadcast receiver 110: antenna

120: digital video broadcast receiver 121: tuner / demodulator

122: interface module 123: channel decoder

124: audio / video decoder 130: digital audio broadcasting receiver

131: down converter 132: front end

133: channel decoder 134: audio / data decoder

135: DA converter 140: program memory

150: data storage unit 160: data storage unit

170: image output unit 180: audio output unit

According to an aspect of the present invention, there is provided a digital broadcast receiver comprising: an antenna for receiving a digital audio broadcast signal and a digital video broadcast signal transmitted from the outside; A central control device which outputs a control signal for performing digital signal processing on the digital audio broadcast signal and the digital video broadcast signal received from the antenna to control the corresponding component; A digital video broadcast receiver for performing digital signal processing on the digital video broadcast signal based on a control signal of the central controller when a predetermined digital video broadcast signal is input from the antenna; A digital audio broadcast receiver for performing digital signal processing on the digital audio broadcast signal based on a control signal of the central controller when a predetermined digital audio broadcast signal is input from the antenna; A switching unit for switching an audio signal from the digital audio broadcasting receiver or the digital video broadcasting receiver; An audio output unit for outputting an audio signal input from the switching unit; A video output unit which outputs a video signal input from the digital video broadcasting receiver; A program memory for simultaneously storing driving programs of the digital audio broadcasting receiver and the digital video broadcasting receiver; And a data storage unit for simultaneously storing the digital audio / video broadcasting data digitally processed by the digital video broadcasting receiving unit and the digital audio broadcasting reception.

Hereinafter, the configuration of the digital broadcast receiver according to the present invention will be described in more detail with reference to FIGS. 2 to 4.

2 is a diagram schematically illustrating an internal configuration of a digital broadcast receiver according to the present invention, FIG. 3 is a diagram illustrating in detail an internal configuration of a digital video broadcast receiver, and FIG. 4 is an internal configuration of a digital audio broadcast receiver. Is a view showing in detail.

First, with reference to FIG. 2, each component and an operation process of the digital video broadcast receiver of the digital broadcast receiver will be described.

As shown in FIG. 2, the antenna 110 receives a digital audio broadcast signal and a digital video broadcast signal transmitted from the outside, and has a predetermined frequency transmitted through a satellite or a base station, for example, in a range of 910Mhz-2150Mhz. And a digital video broadcasting antenna for receiving a broadcast wave having a frequency, and a digital audio broadcasting antenna for receiving a broadcast wave having a frequency in a range of 175Mhz-242Mhz to 1452Mhz-1492Mhz.

The digital video broadcasting receiver 120 performs digital signal processing on the digital video broadcasting signal based on a control signal of the central controller 190 to be described later when the predetermined digital video broadcasting signal received from the antenna 110 is input. As shown in FIG. 3, the tuner / demodulator 121, the interface module 122, the channel decoder 123, and the audio / video decoder 124 are included.

Hereinafter, the configuration and operation of the digital video broadcasting receiver will be described in detail with reference to FIG. 3.

The tuner / demodulator 121 is a digital video broadcast signal of a predetermined shape, for example, a transport packet stream structure, received through the antenna 110 based on a tuning control signal input from a central controller 190 to be described later. Tuning the broadcast channel selected by the user in the digital video broadcast signal of the ofdm signal lamp, and restores the digital video satellite broadcast signal through the process of changing to the intermediate frequency, demodulation and error correction for the tuned broadcast channel signal.

The interface module 122 adjusts the tuner / demodulator 121 depending on the transmission method to suit the transmission method of the digital video broadcasting receiver 120 based on a control signal input from the central controller 190 to be described later. The digital video broadcasting signal is received from the tuner / demodulator 121 and transferred to the channel decoder 123 which will be described later.

The interface module 122 may configure a front end unit for each different broadcast signal regardless of the terrestrial digital broadcast signal, satellite broadcast signal, or cable broadcast signal received through the antenna 110. Not only can the volume be reduced, but the number of parts can be reduced, which increases the competitiveness of the product.

The channel decoder 123 demodulates the digital video broadcasting signal transmitted from the interface module 122 into a baseband signal using a predetermined demodulation circuit based on a control signal of the central controller 190 described later. Then, the audio data and the video data compressed by a predetermined compression method, for example, an MPEG layer, are transferred to the audio / video decoder 124 described later.

The audio / video decoder 124 is demodulated from the channel decoder 123, and when a video signal having a predetermined compression format is input, the audio / video decoder 123 decodes it by MPEG algorithm and restores the original image data. The restored digital video broadcasting data is stored in the data storage unit 150 to be described later or transmitted to the image output unit 170 to be described later, based on the control signal of FIG.

The audio / video decoder 124 decodes the compressed audio signal sequence using an MPEG algorithm and restores the original audio signal. The audio / video decoder 124 then reconstructs the audio broadcast data restored based on the control signal of the central controller 190 described later. The data is stored in the data storage unit 150 or the decoded signal is converted into an audio signal, which is an analog signal, and transferred to the voice output unit 180 described later via the switching unit 160 described later.

The digital audio broadcast receiver 130 performs digital signal processing on the digital audio broadcast signal based on a control signal of the central controller 190 to be described later when a predetermined digital audio broadcast signal is input from the antenna 110. As shown in FIG. 4, the antenna 110, the down converter 131, the front end unit 132, the channel decoder 133, the audio / data decoder 134, and the DA converter 135 are included. It is composed.

That is, the digital audio broadcasting receiver 130 may receive a predetermined digital broadcast data input from the outside through the antenna 110, for example, when a broadcast wave signal including digital broadcast data such as music, weather information, and traffic information is input. After performing digital signal processing on the broadcast wave based on the control signal of the central controller 190 to be described later to restore the broadcast data, the voice output unit 180 to be described later via the switching unit 160 to be described later. Perform the function to output to.

Hereinafter, the configuration and operation of the digital audio broadcasting receiver will be described in detail with reference to FIG. 4.

The antenna 110 is a broadcast of 175-242Mhz to 1425-1492Mhz including a predetermined digital broadcast signal transmitted from a satellite or base station, for example, an audio broadcast signal such as music and general data information such as weather information and traffic information. After receiving the wave signal, and transmits it to the down-converter 131 which will be described later.

The down converter 131 is a low frequency signal that can be processed by the front end unit 132 which will be described later on the basis of a control signal of a central control unit 190 to be described later to the broadcast wave having a predetermined high frequency component transmitted from the antenna 110. After converting to the transfer to the front end 132 to be described later.

The front end unit 132 filters the frequency input from the down converter 131 based on a control signal of the central controller 190 to be described later, converts the frequency into an intermediate frequency IF, and decodes a signal of a specific channel. After selecting, it is transmitted to the channel decoder 133 which will be described later.

In addition, the front end unit 132 converts a signal converted by OFDM modulation, frequency modulation, DQPSK encoding, time interleaving, and Viterbi encoding to a signal input from the downconverter 21 to OFDM modulation. Demodulation, restoring the frequency interleaving signal for error correction, decoding the DQPSK encoded signal, restoring the interleaving for the time in the time deinterleaver, and decoding the Viterbi encoded by the Viterbi decoder.

The channel decoder 133 is a control signal of the central control apparatus 121 which describes a predetermined broadcast signal received by the antenna 110, for example, an audio broadcast signal or a data broadcast signal including weather information and traffic information. Based on this, demodulation is performed to the broadcast signal of the base band.

The channel decoder 133 includes an I / Q demodulation circuit, an OFDM demodulation circuit, and a Viterbi decoding circuit, wherein the I / Q demodulation circuit orthogonally detects a received signal and converts the signal into an I signal. Demodulating to a Q signal, the OFDM demodulation circuit performs FFT processing on the received signal, demodulates the OFDM signal into original data, and the Viterbi decoding circuit corrects an error on the received signal with a Viterbi code or a convolutional code. The process is performed.

The channel decoder 133 has an AFC (Automatic frequency controlling) circuit which receives the synchronous TFPR signal and performs frequency and timing control of the received signal based on the reception output of the TFPR signal.

In addition, the channel decoder 133 demodulates the received signal into a baseband signal and outputs audio data and general data to an audio / data decoder 134 which will be described later.

The audio / data decoder 134 receives the channel information, the audio information, and the data information transmitted from the channel decoder 133 and decodes it based on the control signal of the central controller 190. When the channel information decoded in this process is transmitted to the central control unit 190 to be described later, the central control unit 190 uses the channel information through the DA converter 135 to describe the audio and data information of the channel specified by the channel information. Output

Specifically, the audio / data decoder 134 is based on a control signal of the central controller 190 to be described later. The audio of the channel decoder 133 is based on a predetermined decoding method, for example, the mpeg layer method. Decoding processing for the broadcast signal and data broadcast signal is performed. In other words, the audio / data decoder 1344 may use a predetermined compressed audio / data broadcast signal transmitted from the channel decoder 133 based on a predetermined decoding scheme such as the mpeg layer scheme described above, for example, music, weather, and the like. An audio / data broadcast signal such as traffic information is decoded into an original digital audio broadcast signal which is a broadcast signal before transmission.

In this process, the audio / data decoder 134, unlike conventional analog methods, decodes the program related data (the title of the broadcast, the title of the song, the name of the singer, the news title, the related pictures, etc.) to the transmitted signal. B. Data information signals are transmitted to the central controller 121 to be described later so that the information data (data of traffic conditions, stock information, text messages, pictures, etc.) is transmitted to the user through the central controller 190 to be described later. In addition to the above-described transmission process, the audio / data decoder 1 transmits channel information to the central controller 190 described later as described above. In addition, the decoder receives a decoder control signal from the central control unit 190 so that the user can decode to output a broadcast signal of a desired channel, and transmits and outputs the data information of the corresponding channel to the central control unit 190 to be described later.

Thereafter, the audio / data decoder 134 transmits the digital audio broadcast signal reconstructed based on a predetermined decoding method to the DA converter 135 described later.

The DA converter 135 converts a predetermined digital audio broadcast signal transmitted from the audio / data decoder 134 into a predetermined analog broadcast signal that can be heard by a user, and then a control signal of the central controller 190 to be described later. Based on the control signal of the central control unit 190 to be described later or stored in the database 150 to be described later, the audio output unit to be described later via the switch unit 160 to be described later the analog audio broadcast signal Send to 180.

In addition, the DA converter 135 converts a predetermined digital data broadcast signal transmitted from the audio / data decoder 134, for example, weather information and traffic information, by using a decoder and a filter, and then, the center of which is described later. Based on the control signal of the control device 190 is stored in the database 150 to be described later, or transmitted to the image output unit 160 to be described later.

The program memory 140 simultaneously stores driving programs of the digital audio broadcast receiver 130 and the digital video broadcast receiver 120, and then the digital video broadcast receiver 120 from the central controller 190 to be described later. When a driving signal for driving of the input is input, the corresponding driving program is driven.

In addition, the program memory 140 simultaneously stores driving programs of the digital audio broadcast receiver 130 and the digital video broadcast receiver 120, and then, from the central controller 190 to be described later, the digital audio broadcast receiver ( When a driving signal for driving 130 is input, the corresponding driving program is driven.

The data storage unit 150 receives and stores various pieces of predetermined digital broadcast data, for example, news, movies, music, etc., digitally processed by the digital video broadcast receiving unit 120.

The data storage unit 150 is digital audio broadcast data digitally processed by the digital audio broadcast receiver 130, for example, program-related data (transmission title, The title of the song, the name of the singer, the title of the news, the data of the photo, etc.) or the information data (transportation, stock information, text messages, photos, etc.) input and stores it.

That is, the data storage unit 150 shares the digital signal processed data in the digital video broadcasting receiver 120 and the digital audio broadcast receiver 130 through one storage medium, for example, a hard disk and a memory. The size of the digital broadcast receiver 100 is downsized.

The switch unit 160 transfers a voice signal from the digital audio broadcasting receiver 130 to the voice output unit 180 to be described later.

When the voice signal is input from the digital video broadcasting receiver 120, the switch unit 160 transfers the voice signal to the voice output unit 180 to be described later by switching the voice signal.

The image output unit 170 receives the video data decoded by the audio / video decoder 124 of the digital video broadcasting receiver 120 and outputs it to a predetermined display device.

The voice output unit 180 outputs voice data input from the digital audio broadcast receiver 130 and the digital video broadcast receiver 120 via the switch unit 160.

The central controller 190 is a tuner / demodulator 121 and an interface module 122 constituting the digital video broadcast receiver 120 to perform digital signal processing on the digital video broadcast signal input from the antenna 110. ), The control signal is transmitted to each component such as the channel decoder 123 and the audio / video decoder 124.

The central controller 190 shares a processor used for the digital audio broadcast receiver 130, which will be described later, when a predetermined digital audio broadcast signal is input from the digital audio broadcast receiver 130. The control signal for digital signal processing is transmitted to the digital audio broadcasting receiver 130.

That is, the central controller 190 is programmed to share the processors of the digital audio broadcast receiver 130 and the digital video broadcast receiver 120, and accordingly the digital audio broadcast receiver 130 and the digital video broadcast are based on this. The control of the receiver 120 is performed at the same time.

Hereinafter, the digital broadcast signal processing will be described with reference to the above-described description of each component with reference to FIGS. 2 to 4.

When a digital audio broadcast signal and a digital video broadcast signal including a predetermined digital broadcast signal, for example, an audio signal such as music and data information such as weather and traffic information, are received from the satellite and the ground station through the antenna 110, The central controller 190 transmits a predetermined control signal for digital signal processing of the digital broadcast signal to the digital audio broadcast receiver 130 and the digital video broadcast receiver 120.

In this case, when the digital broadcast signal input through the antenna 110 is a digital audio broadcast signal, the central controller 190 drives a program for the digital audio broadcast receiver 130 stored in the program memory 140. After the operation, the control signal for digital signal processing is transmitted to the digital audio broadcasting receiver 130.

When the control signal for the digital audio broadcast signal is input from the central controller 190, the down converter 131 of the digital audio broadcast receiver 130 processes the digital audio broadcast signal in the front end unit 132. Converted to a frequency band that can be delivered to the front end 132.

When the frequency converted by the down converter 131 is input to the front end unit 132, the front end unit 132 is tuned to a specific channel by a tuner that tunes the digital audio broadcast signal input from the antenna 110 to a corresponding channel. After the signal is selected, the selected signal is converted into an intermediate frequency signal and transmitted to the channel decoder 133.

When the digital audio broadcast signal converted from the front end unit 132 into an intermediate frequency signal is input, the channel decoder 133 may convert the digital audio broadcast signal input from the front end unit 132 into a predetermined demodulation circuit. Demodulate the signal into a baseband signal and pass it to the audio / data decoder 134.

Thereafter, the audio / data decoder 134 receives the demodulated signal as the baseband signal from the channel decoder 133, decodes the data and the audio signal, and transmits the decoded signal to the DA converter 135. The DA converter 135 stores the audio signal decoded by the audio / data decoder 134 in the data storage unit, and then outputs the audio signal when a control signal for outputting an audio signal is input from the central controller. The voice data is transmitted to the voice output unit 150 to output voice data.

In addition, when the digital broadcast signal input through the antenna 110 is a digital video broadcast signal, the central control unit 190 drives a program for the digital video broadcast receiver 120 stored in the program memory 140. After the operation, the control signal for digital signal processing is transmitted to the tuner / demodulator 121 of the digital video broadcasting receiver 120.

When a control signal for a predetermined digital video broadcast signal is input from the central controller 190, the tuner / demodulator 121 outputs the digital video broadcast signal received from the antenna 110 to the central processor 190. Tuning to the corresponding channel based on the control signal of) and performing demodulation and transmitting the demodulated signal to the interface module 122.

When the tuned / demodulated signal is tuned to the corresponding channel from the tuner / demodulator 121 and the input signal is input, the interface module 122 inter-connects the tuner / demodulator based on a transmission method based on a control signal of the central controller 190. The tuner 121 adjusts the digital broadcast receiver 100 to suit the transmission scheme of the digital broadcast receiver 100, receives a digital satellite broadcast signal from the tuner / demodulator 121, and transmits the digital satellite broadcast signal to the channel decoder 123.

Thereafter, the channel decoder 123 demodulates the digital satellite broadcast signal transmitted from the interface module 122 into a baseband signal using a predetermined demodulation circuit and then transmits the demodulated signal to the audio / video decoder 124. The audio / video decoder 124 stores the demodulated video signal in the data storage unit 150, and then outputs the video signal when a control signal for outputting a video signal from the central controller 190 is input. After transmitting to the image output unit 170 displays it.

As described above, the digital broadcast receiver according to the present invention is configured to share a control processor, a driving program and a data storage medium between the digital audio broadcast receiver and the digital video broadcast receiver, thereby reducing the use of a memory and a processor, and using a single power supply. Supplying power by the supply unit provides an effect of reducing power usage.

In addition, the present invention is configured to share the control processor, the drive program and the data storage medium between the digital audio broadcast receiver and the digital video broadcast receiver to share the digital signal processed data through a single storage medium, a separate data storage medium This does not require the present invention and provides an effect of downsizing the size of the digital broadcast receiver.

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

Claims (5)

An antenna for receiving a digital audio broadcast signal and a digital video broadcast signal transmitted from the outside; A central control device for outputting a control signal for performing digital signal processing on the digital audio broadcast signal and the digital video broadcast signal received from the antenna to control the corresponding component; A digital video broadcast receiver for performing digital signal processing on the digital video broadcast signal based on a control signal of the central controller when a predetermined digital video broadcast signal is input from the antenna; A digital audio broadcasting receiver configured to perform digital signal processing on the digital audio broadcast signal based on a control signal of the central controller when a predetermined digital audio broadcast signal is input from the antenna; A program memory for simultaneously storing driving programs of the digital audio broadcasting receiver and the digital video broadcasting receiver; A data storage unit for simultaneously storing the digital audio / video broadcast data digitally processed by the digital video broadcast receiver and the digital audio broadcast reception; A switching unit for switching an audio signal from the digital audio broadcasting receiver or the digital video broadcasting receiver; An audio output unit configured to output an audio signal input from the switching unit; And A video output unit for outputting a video signal input from the digital video broadcast receiver Digital broadcast receiver, characterized in that configured to include. According to claim 1, wherein the central control unit, And a processor configured to share the processor of the digital audio broadcast receiver and the digital video broadcast receiver, and simultaneously control the digital audio broadcast receiver and the digital video broadcast receiver. The method of claim 1, wherein the data storage unit, And a hard disk or a memory for sharing and storing digital audio / video broadcasting data digitally processed by the digital video broadcasting receiving unit and the digital audio broadcasting reception. The digital video broadcasting receiver of claim 1, A tuner / demodulator for tuning and demodulating the digital satellite broadcast signal received from the antenna to a corresponding channel based on a control signal of the central processing unit; An interface module adapted to adjust the tuner / demodulator according to the transmission method to the transmission method of the digital broadcasting receiver, and receive a digital satellite broadcast signal from the tuner / demodulator and transmit it to the outside; A channel decoder for demodulating the digital satellite broadcasting signal transmitted from the interface module into a baseband signal using a predetermined demodulation circuit; And An audio / video decoder configured to decode the audio signal and the video signal demodulated from the channel decoder, respectively; Digital broadcast receiver, characterized in that configured to include. The digital audio broadcasting receiver of claim 1, A down converter for converting a high frequency digital broadcast signal received by the antenna to a low frequency; A front end unit which selects a signal of a specific channel by a tuner for tuning the digital audio broadcasting signal input from the antenna to a corresponding channel and converts the selected signal into an intermediate frequency signal; A channel decoder for demodulating the signal input from the front end unit into a baseband signal through a predetermined demodulation circuit; An audio / data decoder which receives a demodulated signal as a baseband signal from the channel decoder and decodes it into data and an audio signal; And DA converter for converting a digital signal into an analog signal in order to output the signal decoded by the audio / data decoder to the audio output unit. Digital broadcast receiver, characterized in that configured to include.