KR20030025603A - Analog and Digital Audio brocasting Composition Receiver and the receiving method - Google Patents

Abstract

PURPOSE: An analog and digital broadcasting complex receiver and a receiving method thereof are provided to automatically convert into an analog broadcasting mode when a digital audio broadcasting signal is not received, and to output FM/AM broadcasting, thereby preventing a user from feeling unpleasant owing to noise. CONSTITUTION: An analog and digital broadcasting complex receiver(10) comprises as follows. A digital signal processor(12) processes a digital broadcasting signal. An analog signal processor(13) processes an analog signal. A storage(14) stores received data. A communication unit(15) transmits the stored data outside. An output unit(17) outputs the analog or the digital broadcasting signal. A digital signal detector(18) continuously detects a receiving of the digital signal when a digital broadcasting is outputted from the complex receiver(10). A display(16) displays an operation state of the complex receiver(10) or a received state. A controller(11) controls each unit.

Description

Analog and Digital Broadcast Browsing Composition Receiver and the receiving method

The present invention relates to an analog and digital broadcast composite receiver and a receiving method thereof.

More specifically, it is possible to selectively receive analog and digital signals so that the data of each signal can be restored and output, and further, to store and transmit the received data to the outside, and when the digital signal is not received. The present invention relates to an analog and digital broadcast composite receiver configured to automatically switch to an analog broadcast output mode by a control unit and output an AM / FM broadcast.

Currently, the transmission method in a broadcast medium is changing from an analog transmission method to a digital transmission method. Digital radio broadcasting has been proposed in two ways. One is the EUREKA-147 scheme jointly proposed by Pan-Europe and the other is the IN-BAND scheme proposed by the United States. Among the two methods, many countries are currently selecting the new method, EUREKA-147, as their standard and preparing or implementing broadcasting service.

As shown in FIG. 1, the digital broadcasting system includes a broadcast service using terrestrial waves and a service using satellites in a local broadcasting station.

In the satellite broadcasting, a signal is transmitted from a terrestrial digital broadcasting earth station to a satellite for digital broadcasting, and the transmitted signal is received by the satellite and downstream through the L-band.

In the above-described terrestrial broadcast 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.

According to this preparation process, it takes considerable time for the analog broadcasting system to be completely converted to the digital broadcasting system. Therefore, the period of coexistence of analog broadcasting and digital broadcasting will continue for a long time, and only one broadcasting method can be received during the period of analog broadcasting and digital broadcasting coexisting with a single method, that is, an analog dedicated receiver or a digital dedicated receiver. There is a problem that can not provide simultaneous reception for the two broadcast schemes, that is, analog broadcast and digital broadcast.

In addition, when the analog and digital broadcast composite receivers are set to the digital broadcast output mode, there is a problem in that noise is output from the receiver because a system for transmitting digital broadcast is not yet installed in a tunnel or the like. .

In order to solve the above problems, the present invention enables multiple reception of analog broadcasting and digital broadcasting, and automatically switches to the analog broadcasting output mode in an area where the digital broadcasting signal is not received while the digital broadcasting is being output. It is an object of the present invention to provide an analog and digital broadcast composite receiver and a method of receiving the same so that FM broadcast can be output.

1 is a diagram illustrating the concept of digital broadcasting;

2 is a block diagram showing a block of an analog and digital broadcast composite receiver as a preferred embodiment according to the present invention;

3 is a block diagram of a digital signal processor;

4 is a block diagram of an analog signal processor;

5 is a flowchart illustrating a signal processing procedure in a digital broadcasting service restricted area.

Description of the main symbols in the drawings

10: analog and digital broadcast composite receiver

11 control unit 12 digital signal processing unit

13 analog signal processing unit 14 storage unit

15 communication unit 16 display unit

17 output unit 18 digital signal detection unit

The present invention for achieving the above object is a signal processing unit for receiving and processing analog and digital broadcasts therein, a storage unit for storing the received broadcast data, and a communication unit for transmitting the stored broadcast data to the outside; And an output unit for outputting the received analog or digital broadcast.

Analog and digital broadcast composite reception method according to the present invention for achieving the above object,

A first step of determining whether a digital audio broadcast signal (DAB signal) is received when the user is listening to the digital audio broadcast; When the digital audio broadcast signal is received as a result of the determination of the first step, the digital audio broadcast signal is output and the first step is repeatedly performed, and the digital audio broadcast signal (DAB signal) is not received as a result of the determination of the first step. If not, a second step of switching to receive an analog signal; Outputting an AM / FM broadcast as an analog signal; A fourth step of determining whether a digital audio broadcast signal is received after the switching of the third step; If the digital audio broadcast signal is not received as a result of the fourth step, the process is repeated from the third step, and if the digital audio broadcast signal is received, the fifth step is repeatedly performed from the first step.

The analog and digital broadcast composite receiver according to the above-described configuration can be developed into various types of products such as car audio, portable receiver, pc-card type or built-in card type of a broadcasting device.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention will be described in more detail the present invention.

2 is a block diagram of an analog and digital broadcast composite receiver as a preferred embodiment of the present invention.

As shown in FIG. 2, the analog and digital broadcast composite receiver 10 according to the present invention includes an antenna, a digital signal processor 12 performing digital broadcast signal processing, and an analog signal processor 13 performing analog signal processing. ), A storage unit 14 for storing the received data, a communication unit 15 provided to transmit the stored data to the outside, an output unit 17 for outputting an analog or digital signal processed broadcast signal, and the digital signal processing unit. A digital signal detector 18 configured between the 12 and the controller 11 to continuously detect the reception of the digital signal when the digital broadcast is output from the analog and digital broadcast composite receiver, and storing the received data. The unit 14, the communication unit 15 for transmitting the stored data to the outside or communication with the outside and the reception state and analog and digital room The display unit 16 which displays the operation state of the song composite receiver 10, etc., and the control part 11 which controls each component are comprised.

In addition to the above-described configuration, a key input unit for receiving a user's control signal may be further configured.

Each of the above-described components is implemented in the form of a predetermined chip and can be operated by being attached to the substrate for the analog and digital broadcast composite receiver 10 according to the present invention. It is also possible to connect the analog receiver to the digital receiver using a jack or the like as a predetermined connection means.

The above-mentioned antenna has a digital broadcasting antenna, an AM receiving antenna, and an FM receiving antenna, respectively.

The above-described control unit 11 has an automatic channel search function, an automatic channel storage function, a data display function of a received additional service, an RS-232 output function of a received additional data, an alarm function in a non-service area, and an automatic display function of another medium. It displays the search status, additional data, etc. on the front LCD, saves the last channel, operates by the remote control, and automatically switches between the digital signal processor and the analog signal processor. In addition, the above-described control unit 11 performs a function of controlling all components of the transmission of a control signal for operating the corresponding component to each component of the analog and digital broadcast composite receiver 10.

The digital signal processor 12 implements a method of receiving a digital broadcast signal in a conventional digital broadcast technique, and an operation process thereof will be described in more detail with reference to FIG. 3, and the analog signal processor 4 is also illustrated in FIG. Reference will be made in more detail below with reference to 4.

The digital signal detector 18 described above monitors whether the digital audio broadcast is continuously received in the situation where the digital broadcast is being received. The digital signal detector 18 stores a predetermined digital broadcast format therein, compares the received data with the stored format, and controls the controller when the input digital broadcast signal is out of a predetermined standard range for a predetermined time. 11) outputs a digital signal disconnection signal. The controller 11 receiving the above-described digital signal disconnection signal stops driving the digital signal processor 12 and simultaneously drives the analog signal processor 13 to switch to an analog broadcast reception mode such as FM / AM. Control to be output through the analog and digital composite receiver.

The storage unit 14 stores audio and data information desired by a user. A flash memory, a hard disk, a floppy disk, a DVD, or the like may be used as the storage medium.

The communication unit 15 provides a communication interface with the outside in the case of transmitting the broadcast signal received by the analog and digital combined broadcast receiver 10 to the outside, by a wireless transmission function, or RS-232 and various communication interfaces Perform connection with external equipment. Here, the externally connected equipment is a remote controller, a PC, a notebook, a PDA, a mini disc player, a CDR, a cassette recorder, an MP3 player, a cell phone, or an analog and digital broadcast receiver.

In addition, RDS (Radio data system) may be additionally configured to transmit data by superimposing data such as traffic information, stock information, paging, and background music in the FM frequency band.

Referring to the operation of the analog and digital broadcast composite receiver 10 described above is as follows.

The analog or digital broadcast signal is input through the corresponding antenna, respectively, and the digital signal processing unit 12 or the analog signal processing unit 13 performs signal processing according to the preset operation mode to display data on the display unit 16 and simultaneously output the same. The unit 17 outputs audio. In addition, when the user requests, the data may be stored in the storage unit 14 and may be transmitted to other external devices such as a PC or an audio device through the communication unit 15.

The digital broadcast signal performs a data restoration process and an amplification process, a D / A conversion process, and stores the resultant signal in a storage unit or transmits it to the outside through a communication unit, outputs audio through an output unit, and outputs a video signal or a display unit. Output the data signal. The analog broadcast signal is also subjected to processing such as tuning, demodulation, amplification, and the like, and the audio signal is output to the output unit 17 and the video signal or data signal is output through the display unit 16.

FIG. 3 is a block diagram showing the configuration of the digital signal processing unit 12 configured in the analog and digital broadcast composite receiver 10 of FIG.

As shown, the digital signal processor 12 includes a down converter 21, a front end 22, an analog-to-digital converter (hereinafter referred to as an ADC) 23, a data / audio decoder 24, and an audio DA. It comprises a converter 25.

The down converter 21 converts the received high frequency signal into a frequency band that can be processed by the front end 22.

The front end 22 filters the input frequency into the intermediate frequency IF for filtering and decoding. In addition, the front end 22 communicates with the control unit 11 and is set according to the frequency to be received according to the tuner control signal input from the control unit 11. In addition, the signal input from the front end 22 is subjected to OFDM modulation on the signal converted by OFDM modulation, frequency modulation, DQPSK encoding, time interleaving, and Viterbi encoding performed by the transmitter, and error correction is performed. A frequency interleaving signal is recovered, and after decoding the DQPSK coded signal, the interleaving for time is reconstructed in the time deinterleaver and the Viterbi decoder is decoded.

The data / audio decoder 24 decodes channel information and data audio information from the input signal. The channel information decoded in this process is transmitted to the control unit 11 so that the control unit 11 transmits the audio information of the channel designated by the control unit 11 using the channel information through the audio DA converter 24 and the output unit 17. Output

In this process, the data / audio decoder 24, unlike conventional analog methods, decodes the program related data (data such as the title of a broadcast, a title of a song, a singer's name, a news title, and a related picture) to a transmitted signal. The data information signal is transmitted to the control unit so that the information data (data such as traffic situation, stock information, text message, photo, etc.) is transmitted to the user through the control unit 11. In addition to the above-described transmission process, the data / audio decoder 24 transmits channel information to the controller 11 as described above. In addition, the decoder 11 receives the decoder control signal from the controller 11 so as to perform decoding to output a broadcast signal of a channel desired by the user, and transmits and outputs data information of the corresponding channel to the controller.

Next, a digital signal processing process will be described with reference to the above-described description of each component.

When the analog and digital broadcast composite receiver 10 receives a digital broadcast signal, the digital broadcast signal is transmitted to the digital signal processor 12. The transmitted signal is converted into a frequency band that can be processed by the front end 21 by the down converter 21 and input to the front end 21. The frequency converted by the down converter 21 is input to the front end 21, and the frequency signal input to the front end 21 is converted into an intermediate frequency IF for filtering and decoding. The signal converted to the intermediate frequency is bandpass sampled by the ADC 23 and input to the data / audio decoder 8. The data / audio decoder 8 decodes channel information, data, video, and audio information from the input signal, and outputs audio information of the channel designated by the controller through the audio DA converter 21 and the output unit 17. At the same time, the data or video information is decoded and the data information is transmitted to the controller 11 so that the data information is output to the display unit 16.

4 is a block diagram of an analog signal processor 13 configured in the analog and digital broadcast composite receiver 10.

As shown, the analog signal processor 13 includes an AM antenna for AM signals, an AM tuner 31, an FM antenna for receiving FM signals, an FM tuner 32, and an AM / FM decoding the AM / FM signal. The decoder 33 is comprised.

The AM antenna receives an AM broadcast signal.

The AM tuner 31 selects an AM broadcast frequency of a channel to be selected from the received AM broadcast signals.

The FM antenna receives an FM broadcast signal.

The FM tuner 32 selects an FM broadcast frequency of a channel to be selected from the received FM broadcast signals.

The above-described AM / FM decoder 33 decodes the broadcast of the channel selected by the controller and outputs it through the output unit 17.

In order for the above-mentioned analog and digital receiver 10 to receive a broadcast, a user sets a reception mode of an analog broadcast or a digital broadcast in advance or automatically switches to an analog broadcast reception mode or a digital broadcast reception mode in an area where an analog or digital broadcast is received. The control unit 11 controls to stop the operation of the digital signal processing unit 12 when it is set to an analog broadcast reception mode, and the control unit 11 controls the analog signal processing unit (if it is set to a digital broadcast reception mode). 13) to control the analog and digital broadcast composite receiver 10 to stop the operation.

5 is a flowchart illustrating a process of an analog and digital broadcast complex reception method according to the present invention.

As shown in the figure, when the user receives and outputs a digital broadcast (S501), it is detected whether the digital broadcast signal is still being received (S502). If the digital signal is being received, the digital broadcast is continuously output and the digital broadcast is If not received, switch to the analog signal reception mode (S503). After switching to the analog reception mode, the FM / AM broadcast as the analog broadcast is output (S504). When the FM / AM broadcast is output, it is again determined whether a digital audio broadcast signal is received (S505). If the digital audio broadcast signal is not received as a result of the determination in step S505, the FM / AM broadcast is continuously output. If the digital audio broadcast signal is received, the digital audio broadcast signal such as a tunnel is not reached by repeating from step S501. In the digital audio broadcast reception mode, noise can be prevented from being output.

Whether or not the digital signal of step S502 is received may include inputting a digital signal generated after converting a high frequency signal received by the digital signal processor to perform an analog-digital conversion to a mask of a digital signal having a digital audio broadcasting format. Whether the received signal matches the mask and whether the transmission packet format of the digital signal is the transmission format of the digital audio broadcast can be checked, and if it does not match, it can be determined with the duration.

A key input unit may be further configured in the analog digital receiver 10 to receive a user's requirement.

The present invention provides an effect of receiving the analog digital broadcast to one receiver at the time when analog digital broadcast coexists in the transition period from analog broadcast to digital broadcast.

In addition, the analog and digital broadcast composite receiver according to the present invention is set to the digital broadcast reception mode and automatically switches to the analog broadcast mode when the digital audio broadcast signal is not received by moving to a place such as a tunnel while outputting the digital audio broadcast. By outputting the FM / AM broadcast to provide an effect that can prevent the user from feeling uncomfortable by the noise.

Claims (6)

An antenna for receiving an external broadcast signal; A digital signal processor which processes the digital broadcast signal received from the antenna; A digital signal monitor configured to be connected to the digital signal processor to monitor reception of a digital audio broadcast signal; An analog signal processor configured to process an analog broadcast signal received from the antenna; An output unit for outputting an analog or digital signal processed broadcast signal; A display unit which displays a reception state of a broadcast and an operation state of each component; And It is determined whether a broadcast signal received from the outside is an analog broadcast signal or a digital broadcast signal, and a reception mode is set according to the determined broadcast signal method, and the broadcast signal is received and output according to the reception mode, and the digital audio broadcast output is performed. When the digital signal monitoring unit outputs a stop signal for receiving a digital signal, the analog and digital broadcasting composite comprising a control unit for switching to the analog mode to output an analog broadcast, and controls the respective components receiving set. The method of claim 1, wherein the digital signal monitoring unit, And a mask corresponding to the digital audio broadcasting format, and comparing the digital signal from the received signal with the mask to determine whether a digital signal is received. The method of claim 1, wherein the digital signal monitoring unit, And storing the digital audio broadcast packet format, and comparing the packet format of the digital signal with the mask in the received signal to determine whether a digital signal is received. A first step of determining whether a digital audio broadcast signal (DAB signal) is received when the user is listening to the digital audio broadcast; When the digital audio broadcast signal is received as a result of the determination of the first step, the digital audio broadcast signal is output and the first step is repeatedly performed, and the digital audio broadcast signal (DAB signal) is not received as a result of the determination of the first step. If not, a second step of switching to receive an analog signal; Outputting an AM / FM broadcast as an analog signal; A fourth step of determining whether a digital audio broadcast signal is received after the switching of the third step; If the digital audio broadcast signal is not received as a result of the fourth step, the process is repeated from the third step, and if the digital audio broadcast signal is received, the analog and digital broadcast is performed. Complex reception method. The method of claim 4, wherein the determining of the first step comprises: Analog and digital broadcast composite reception method characterized by comparing the received digital audio broadcast with the digital pulse mask of the digital audio signal having a predetermined format of the digital audio broadcast with respect to the analog / digital converted digital signal . The method of claim 4, wherein the determining of the first step comprises: Wherein the received digital audio broadcast stores a predetermined packet format of the digital audio broadcast with respect to the analog / digital converted digital signal to detect and compare the packet format of the received digital signal with the packet format of the previously stored broadcast. And a digital broadcast composite reception method.